Space-saving SC70 and SOT-23 packaging Wide bandwidth: 8 MHz @ 5 V
Low offset voltage: 1.2 mV maximum Rail-to-rail output swing
2.9 V/μs slew rate Unity gain stable
Single-supply operation: 2.7 V to 12 V
NC | 1 | 8 | NC | ||
–IN A | 2 | 7 | V+ | ||
+IN A | 3 | 6 | OUT A | ||
V– | 4 | AD8519 | 5 | NC |
01756-001
NC = NO CONNECT
Figure 1. 8-Lead SOIC (R Suffix)
AD8519
Portable communications Microphone amplifiers Portable phones
Sensor interface
OUT A 1
V– 2
+IN A 3
V+
5
01756-002
4 –IN A
Active filters PCMCIA cards ASIC input drivers
Wearable computers Battery-powered devices Voltage reference buffers Personal digital assistants
Figure 2. 5-Lead SC70 and SOT-23 (KS and RJ Suffixes)
OUT A | 1 | AD8529 | 8 | V+ | |
–IN A | 2 | 7 | OUT B | ||
+IN A | 3 | 6 | –IN B | ||
V– | 4 | 5 | +IN B |
01756-003
Figure 3. 8-Lead SOIC and MSOP (R and RM Suffixes)
The AD8519 and AD8529 are rail-to-rail output bipolar amplifiers with a unity gain bandwidth of 8 MHz and a typical voltage offset of less than 1 mV. The AD8519 brings precision and bandwidth to the SC70 and SOT-23 packages. The low supply current makes the AD8519/AD8529 ideal for battery- powered applications. The rail-to-rail output swing of the AD8519/AD8529 is larger than standard video op amps, making them useful in applications that require greater dynamic range than standard video op amps. The 2.9 V/μs slew rate makes the AD8519/AD8529 a good match for driving ASIC inputs such as voice codecs.
The small SC70 package makes it possible to place the AD8519 next to sensors, reducing external noise pickup.
The AD8519/AD8529 is specified over the extended industrial (−40°C to +125°C) temperature range. The AD8519 is available in 5-lead SC70 and 5-lead SOT-23 packages, and an 8-lead SOIC surface-mount package. The AD8529 is available in 8-lead SOIC and 8-lead MSOP packages.
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedby AnalogDevices foritsuse, norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©1998–2007 Analog Devices, Inc. All rights reserved.
Typical Performance Characteristics 8
Precision Full-Wave Rectifier 12
10× Microphone Preamp Meets PC99 Specifications 13
Two-Element Varying Bridge Amplifier 13
5/07—Rev. C to Rev. D
Changes to Features 1
Changes to General Description 1
Changes to Two-Element Bridge Amplifier Section 13
Updated Outline Dimensions 14
2/03—Rev. B to Rev. C
Changed μSOIC to MSOP.................................................Universal
Changed SO-8 to R-8 .........................................................Universal
Changes to Precision Full-Wave Rectifier section 9
Changes to 10× Microphone Preamp Meets PC99
Specifications section 9
Updated Outline Dimensions 12
VS = 5.0 V, V− = 0 V, VCM = 2.5 V, TA = 25°C, unless otherwise noted.
Table 1.
Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
INPUT CHARACTERISTICS | ||||||
Offset Voltage | VOS | AD8519AKS, AD8519ART | 600 | 1100 | μV | |
−40°C ≤ TA ≤ +125°C | 800 | 1300 | μV | |||
AD8519AR (R-8), AD8529 | 600 | 1000 | μV | |||
−40°C ≤ TA ≤ +125°C | 1100 | μV | ||||
Input Bias Current | IB | 300 | nA | |||
−40°C ≤ TA ≤ +125°C | 400 | nA | ||||
Input Offset Current | IOS | ±50 | nA | |||
−40°C ≤ TA ≤ +125°C | ±100 | nA | ||||
Input Voltage Range | VCM | 0 | 4 | V | ||
Common-Mode Rejection Ratio | CMRR | 0 V ≤ VCM ≤ 4.0 V, −40°C ≤ TA ≤ +125°C | 63 | 100 | dB | |
Large Signal Voltage Gain | AVO | RL = 2 kΩ, 0.5 V < VOUT < 4.5 V | 30 | V/mV | ||
RL = 10 kΩ, 0.5 V < VOUT < 4.5 V | 50 | 100 | V/mV | |||
RL = 10 kΩ, −40°C ≤ TA ≤ +125°C | 30 | V/mV | ||||
Offset Voltage Drift | ∆VOS/∆T | 2 | μV/°C | |||
Bias Current Drift | ∆IB/∆T | 500 | pA/°C | |||
OUTPUT CHARACTERISTICS | ||||||
Output Voltage Swing High | VOH | IL = 250 μA | ||||
−40°C ≤ TA ≤ +125°C | 4.90 | V | ||||
IL = 5 mA | 4.80 | V | ||||
Output Voltage Swing Low | VOL | IL = 250 μA | ||||
−40°C ≤ TA ≤ +125°C | 80 | mV | ||||
IL = 5 mA | 200 | mV | ||||
Short-Circuit Current | ISC | Short to ground, instantaneous | ±70 | mA | ||
Maximum Output Current | IOUT | ±25 | mA | |||
POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier | PSRR ISY | VS = 2.7 V to 7 V −40°C ≤ TA ≤ +125°C VOUT = 2.5 V −40°C ≤ TA ≤ +125°C | 110 80 600 | 1200 1400 | dB dB μA μA | |
DYNAMIC PERFORMANCE | ||||||
Slew Rate | SR | 1 V < VOUT < 4 V, RL = 10 kΩ | 2.9 | V/μs | ||
Settling Time | tS | To 0.01% | 1200 | ns | ||
Gain Bandwidth Product | GBP | 8 | MHz | |||
Phase Margin | Φm | 60 | Degrees | |||
NOISE PERFORMANCE | ||||||
Voltage Noise | en p-p | 0.1 Hz to 10 Hz | 0.5 | μV p-p | ||
Voltage Noise Density | en | f = 1 kHz | 10 | nV/√Hz | ||
Current Noise Density | in | f = 1 kHz | 0.4 | pA/√Hz |
VS = 3.0 V, V− = 0 V, VCM = 1.5 V, TA = 25°C, unless otherwise noted.
Table 2.
Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
INPUT CHARACTERISTICS | ||||||
Offset Voltage | VOS | AD8519AKS, AD8519ART | 700 | 1200 | μV | |
−40°C ≤ TA ≤ +125°C | 900 | 1400 | μV | |||
AD8519AR (R-8), AD8529 | 700 | 1100 | μV | |||
−40°C ≤ TA ≤ +125°C | 1200 | μV | ||||
Input Bias Current | IB | 300 | nA | |||
Input Offset Current | IOS | ±50 | nA | |||
Input Voltage Range | VCM | 0 | 2 | V | ||
Common-Mode Rejection Ratio | CMRR | 0 V ≤ VCM ≤ 2.0 V, | ||||
−40°C ≤ TA ≤ +125°C | 55 | 75 | dB | |||
Large Signal Voltage Gain | AVO | RL = 2 kΩ, 0.5 V < VOUT < 2.5 V | 20 | V/mV | ||
RL = 10 kΩ | 20 | 30 | V/mV | |||
OUTPUT CHARACTERISTICS Output Voltage Swing High Output Voltage Swing Low | VOH VOL | IL = 250 μA IL = 5 mA IL = 250 μA IL = 5 mA | 2.90 2.80 | 100 200 | V V mV mV | |
POWER SUPPLY | ||||||
Power Supply Rejection Ratio | PSRR | VS = 2.5 V to 7 V, −40°C ≤ TA ≤ +125°C | 60 | 80 | dB | |
Supply Current/Amplifier | ISY | VOUT = 1.5 V | 600 | 1100 | μA | |
−40°C ≤ TA ≤ +125°C | 1300 | μA | ||||
DYNAMIC PERFORMANCE | ||||||
Slew Rate | SR | RL = 10 kΩ | 1.5 | V/μs | ||
Settling Time | tS | To 0.01% | 2000 | ns | ||
Gain Bandwidth Product | GBP | 6 | MHz | |||
Phase Margin | Φm | 55 | Degrees | |||
NOISE PERFORMANCE | ||||||
Voltage Noise Density | en | f = 1 kHz | 10 | nV/√Hz | ||
Current Noise Density | in | f = 1 kHz | 0.4 | pA/√Hz |
VS = 2.7 V, V− = 0 V, VCM = 1.35 V, TA = 25°C, unless otherwise noted.
Table 3.
Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
INPUT CHARACTERISTICS | ||||||
Offset Voltage | VOS | AD8519AKS, AD8519ART | 700 | 1400 | μV | |
−40°C ≤ TA ≤ +125°C | 900 | 1600 | μV | |||
AD8519AR (R-8), AD8529 | 700 | 1200 | μV | |||
−40°C ≤ TA ≤ +125°C | 1300 | μV | ||||
Input Bias Current | IB | 300 | nA | |||
Input Offset Current | IOS | ±50 | nA | |||
Input Voltage Range | VCM | 0 | 2 | V | ||
Common-Mode Rejection Ratio | CMRR | 0 V ≤ VCM ≤ 1.7 V, −40°C ≤ TA ≤ +125°C | 55 | 75 | dB | |
Large Signal Voltage Gain | AVO | RL = 2 kΩ, 0.5 V < VOUT < 2.2 V | 20 | V/mV | ||
RL = 10 kΩ | 20 | 30 | V/mV | |||
OUTPUT CHARACTERISTICS Output Voltage Swing High Output Voltage Swing Low | VOH VOL | IL = 250 μA IL = 5 mA IL = 250 μA IL = 5 mA | 2.60 2.50 | 100 200 | V V mV mV | |
POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier | PSRR ISY | VS = 2.5 V to 7 V −40°C ≤ TA ≤ +125°C VOUT = 1.35 V −40°C ≤ TA ≤ +125°C | 60 | 80 600 | 1100 1300 | dB μA μA |
DYNAMIC PERFORMANCE | ||||||
Slew Rate | SR | RL = 10 kΩ | 1.5 | V/μs | ||
Settling Time | tS | To 0.01% | 2000 | ns | ||
Gain Bandwidth Product | GBP | 6 | MHz | |||
Phase Margin | Φm | 55 | Degrees | |||
NOISE PERFORMANCE | ||||||
Voltage Noise Density | en | f = 1 kHz | 10 | nV/√Hz | ||
Current Noise Density | in | f = 1 kHz | 0.4 | pA/√Hz |
VS = 5.0 V, V− = −5 V, VCM = 0 V, TA = 25°C, unless otherwise noted.
Table 4.
Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
INPUT CHARACTERISTICS | ||||||
Offset Voltage | VOS | AD8519AKS, AD8519ART | 600 | 1100 | μV | |
−40°C ≤ TA ≤ +125°C | 800 | 1300 | μV | |||
AD8519AR (R-8), AD8529 | 600 | 1000 | μV | |||
−40°C ≤ TA ≤ +125°C | 1100 | μV | ||||
Input Bias Current | IB | VCM = 0 V | 300 | nA | ||
VCM = 0 V, −40°C ≤ TA ≤ +125°C | 400 | nA | ||||
Input Offset Current | IOS | VCM = 0 V | ±50 | nA | ||
VCM = 0 V, −40°C ≤ TA ≤ +125°C | ±100 | nA | ||||
Input Voltage Range | VCM | −5 | +4 | V | ||
Common-Mode Rejection Ratio | CMRR | −4.9 V ≤ VCM ≤ +4.0 V, | ||||
−40°C ≤ TA ≤ +125°C | 70 | 100 | dB | |||
Large Signal Voltage Gain | AVO | RL = 2 kΩ | 30 | V/mV | ||
RL = 10 kΩ | 50 | 200 | V/mV | |||
−40°C ≤ TA ≤ +125°C | 25 | V/mV | ||||
Offset Voltage Drift | ∆VOS/∆T | 2 | μV/°C | |||
Bias Current Drift | ∆IB/∆T | 500 | pA/°C | |||
OUTPUT CHARACTERISTICS | ||||||
Output Voltage Swing High | VOH | IL = 250 μA | ||||
−40°C ≤ TA ≤ +125°C | 4.90 | V | ||||
IL = 5 mA | 4.80 | V | ||||
Output Voltage Swing Low | VOL | IL = 250 μA | ||||
−40°C ≤ TA ≤ +125°C | −4.90 | V | ||||
IL = 5 mA | −4.80 | V | ||||
Short-Circuit Current | ISC | Short to ground, instantaneous | ±70 | mA | ||
Maximum Output Current | IOUT | ±25 | mA | |||
POWER SUPPLY | ||||||
Power Supply Rejection Ratio | PSRR | VS = ±1.5 V to ±6 V, −40°C ≤ TA ≤ +125°C | 60 | 100 | dB | |
Supply Current/Amplifier | ISY | VOUT = 0 V | 600 | 1200 | μA | |
−40°C ≤ TA ≤ +125°C | 1400 | μA | ||||
DYNAMIC PERFORMANCE | ||||||
Slew Rate | SR | −4 V < VOUT < +4 V, RL = 10 kΩ | 2.9 | V/μs | ||
Settling Time | tS | To 0.01% | 1000 | ns | ||
Gain Bandwidth Product | GBP | 8 | MHz | |||
Phase Margin | Φm | 60 | Degrees | |||
NOISE PERFORMANCE | ||||||
Voltage Noise Density | en | f = 1 kHz | 10 | nV/√Hz | ||
Current Noise Density | in | f = 1 kHz | 0.4 | pA/√Hz |
Parameter | Rating |
Supply Voltage | ±6 V |
±6 V | |
±0.6 V | |
Storage Temperature Range | −65°C to +150°C |
Operating Temperature Range | −40°C to +125°C |
−65°C to +150°C | |
Lead Temperature Range (Soldering, 60 sec) | 300°C |
1 For supply voltages less than ±6 V, the input voltage is limited to less than or equal to the supply voltage.
2 For differential input voltages greater than ±0.6 V, the input current should be limited to less than 5 mA to prevent degradation or destruction of the input devices.
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Table 6.
Package Type | θ 1 JA | θJC | Unit |
5-Lead SC70 (KS) | 376 | 126 | °C/W |
5-Lead SOT-23 (RJ) | 230 | 146 | °C/W |
8-Lead SOIC (R) | 158 | 43 | °C/W |
8-Lead MSOP (RM) | 210 | 45 | °C/W |
1 θJA is specified for worst-case conditions, that is, θJA is specified for device soldered in circuit board for SOT-23 and SOIC packages.
VS = 5V TA = 25°C | COUNT = 395 OP AMPS | |||||||||
60
QUANTITY OF AMPLIFIERS
50
40
30
20
10
40
VS = 5V TA = 25°C
0
INPUT BIAS CURRENT (nA)
–40
–80
–120
–160
–200
01756-004
0
–1.0 –0.6 –0.2 0.2 0.6 1.0
INPUT OFFSET VOLTAGE (mV)
–240
01756-007
0 1 2 3 4 5
COMMON-MODE VOLTAGE (V)
Figure 4. Input Offset Voltage Distribution Figure 7. Input Bias Current vs. Common-Mode Voltage
VS = 5V
600 120
SUPPLY CURRENT (µA)
COMMON-MODE REJECTION (dB)
100
550
80
60
500
01756-005
40
450
0 2 4 6 8 10 12
SUPPLY VOLTAGE (V)
20
01756-008
0 1 2 3 4 5
COMMON-MODE VOLTAGE (V)
Figure 5. Supply Current per Amplifier vs. Supply Voltage
800
Figure 8. Common-Mode Rejection vs. Common-Mode Voltage
VS = 5V TA = 25°C | ||||||||||||||
GAIN | ||||||||||||||
PHASE | ||||||||||||||
50
SUPPLY CURRENT (µA)
700
600
VS = 5V 40
OPEN-LOOP GAIN (dB)
PHASE SHIFT (Degrees)
30 45
20 90
500
400
VS = 10V
VS = 2.7V, 3.0V
10
0
–10
–20
135
180
225
270
01756-006
300
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
Figure 6. Supply Current per Amplifier vs. Temperature
–30
01756-009
100k 1M 10M 100M FREQUENCY (Hz)
Figure 9. Open-Loop Gain, Phase vs. Frequency
60
CLOSED-LOOP GAIN (dB)
40
20
0
–20
VS = 5V RL = 830Ω TA = 25°C
CL ≤ 5pF
60
VS = 5V VCM = 2.5V
50 RL = 10kΩ
TA = 25°C VIN = ±50mV
OVERSHOOT (%)
40
–OS
30
+OS
20
10
01756-010
–40
10k 100k 1M 10M 100M FREQUENCY (Hz)
Figure 10. Closed-Loop Gain vs. Frequency
0
01756-013
10 100 1k CAPACITANCE (pF)
Figure 13. Overshoot vs. Capacitance Load
110
100
90
CMRR (dB)
80
70
60
50
40
30
VS = 5V TA = 25°C
4
VS = 5V
1%
3 TA = 25°C
0.1%
2
STEP SIZE (V)
1
0
0.1%
–1
1%
–2
01756-014
–3
01756-011
20
1k 10k 100k 1M 10M FREQUENCY (Hz)
Figure 11. CMRR vs. Frequency
–4
0 1 2
SETTLING TIME (µs)
Figure 14. Step Size vs. Settling Time
90
80
70
60
PSRR (dB)
+PSRR
50
40
30
20
10
–PSRR
VS = 5V TA = 25°C
5
MAXIMUM OUTPUT SWING (V p-p)
4
DISTORTION < 1%
3
2
1
VS = 5V AVCC = 1 RL = 10kΩ
TA = 25°C
CL = 15pF
01756-012
0
1k 10k 100k 1M 10M FREQUENCY (Hz)
Figure 12. PSRR vs. Frequency
0
01756-015
10k 100k 1M 10M FREQUENCY (Hz)
Figure 15. Output Swing vs. Frequency
300
250
VS = 5V TA = 25°C
VS = ±2.5V AV = 100kΩ
en = 0.4µV p-p
OUTPUT IMPEDANCE (Ω)
200
150
100
50
AVCC = 10
01756-019
AVCC = 1
01756-016
0
100k 1M 10M FREQUENCY (Hz)
20mV 1s
Figure 16. Output Impedance vs. Frequency Figure 19. 0.1 Hz to 10 Hz Noise
80
VS = 5V
VOLTAGE NOISE DENSITY (nV/ Hz)
70 TA = 25°C
60
50
VS = ±2.5V VIN = 6V p-p AV = 1
40
30
20
01756-017
01756-020
10
0
10 100 1k 10k FREQUENCY (Hz)
Figure 17. Voltage Noise Density
1V
Figure 20. No Phase Reversal
20µs
8
VS = 5V
CURRENT NOISE DENSITY (pA/ Hz)
7 TA = 25°C
6
5
VS = ±2.5V AVCC = 1
TA = 25°C CL = 100pF RL = 10kΩ
4
3
2
01756-018
1
0
10 100 1k 10k FREQUENCY (Hz)
20mV
01756-021
500ns
Figure 18. Current Noise Density Figure 21. Small Signal Transient Response
VS = ±2.5V AVCC = 1 TA = 25°C CL = 100pF | ||||||||||
500mV | 50µs |
01756-022
Figure 22. Large Signal Transient Response
The maximum power that can be safely dissipated by the AD8519/AD8529 is limited by the associated rise in junction temperature. The maximum safe junction temperature is 150°C for these plastic packages. If this maximum is momentarily exceeded, proper circuit operation is restored as soon as the
die temperature is reduced. Operating the product in an
VIN
R1 10kΩ
R4 10kΩ
R2 10kΩ
D1 1N914
U1
NODE A
D2 1N914
R3 4.99kΩ
R5 10kΩ
U2
AD8519
VOUT
overheated condition for an extended period can result in permanent damage to the device.
R6
5kΩ
AD8519
VIRTUAL GROUND =
VCC 2
01756-023
R7 3.32kΩ
Slew rate is probably the most underestimated parameter when
designing a precision rectifier. Yet without a good slew rate, large glitches are generated during the period when both diodes are off.
The operation of the basic circuit (shown in Figure 23) should be examined before considering the slew rate further. U1 is set up to have two states of operation. D1 and D2 diodes switch the output between the two states. State one is an inverter with a gain of +1, and state two is a simple unity gain buffer where the output is equal to the value of the virtual ground. The virtual ground is the potential present at the noninverting node of the U1. State one is active when VIN is larger than the virtual ground. D2 is on in this condition. If VIN drops below virtual ground, D2 turns off and D1 turns on. This causes the output of U1 to simply buffer the virtual ground and this configuration is state two. Therefore, the function of U1, which results from these two states of operation, is a half-wave inverter. The U2 function takes the inverted half wave at a gain of two and sums it into the original VIN wave, which outputs a rectified full wave.
Figure 23. Precision Full-Wave Rectifier
Switching glitches are caused when D1 and D2 are both momentarily off. This condition occurs every time the input signal is equal to the virtual ground potential. When this condition occurs, the U1 stage is taken out of the VOUT equation and VOUT is equal to VIN × R5 × (R4 || R1 + R2 + R3). Note that Node A should be VIN inverted or virtual ground, but in this condition, Node A is simply tracking VIN. Given a sine wave input centered around virtual ground, glitches are generated
at the sharp negative peaks of the rectified sine wave. If the glitches are hard to notice on an oscilloscope, raise the fre- quency of the sine wave until they become apparent. The size of the glitches is proportional to the input frequency, the diode
turn-on potential (0.2 V or 0.65 V), and the slew rate of the op amp.
R6 and R7 are both necessary to limit the amount of bias current related voltage offset. Unfortunately, there is no perfect value for R6 because the impedance at the inverting node is altered as D1 and D2 switch. Therefore, there is also some
VOUT
VIN
2 VIN
1 0
unresolved bias current related offset. To minimize this offset,
use lower value resistors or choose an FET amplifier if the
This type of rectifier can be very precise if the following electrical parameters are adhered to:
All passive components should be of tight tolerance, 1% for resistors and 5% for capacitors.
If the application circuit requires high impedance (that is, direct sensor interface), then an FET amplifier is a better choice than the AD8519.
An amp such as the AD8519, which has a great slew rate specification, yields the best result because the circuit involves switching.
optimized offset is still intolerable.
The AD8519 offers a unique combination of speed vs. power ratio at 2.7 V single supply, small size (SC70 and SOT-23), and low noise that makes it an ideal choice for most high volume and high precision rectifier circuits.
This circuit, while lacking a unique topology, is anything but featureless when an AD8519 is used as the op amp. This preamp gives 20 dB gain over a frequency range of 20 Hz to 20 kHz and is fully PC99 compliant in all parameters including THD + N, dynamic range, frequency range, amplitude range, and crosstalk. Not only does this preamp comply with the PC99 specifications, it far surpasses them. In fact, when the input noise is 120 dB, this preamp has a VOUT noise of around 100 dB, which is suit- able for most professional 20-bit audio systems. At 120 dB THD
+ N in unity gain, the AD8519 is suitable for 24-bit professional audio systems. In other words, the AD8519 will not be the limiting performance factor in audio systems despite its small size and low cost.
Slew rate related distortion is not present at the lower voltages because the AD8519 is so fast at 2.1 V/μs. A general rule of thumb for determining the necessary slew rate for an audio system is to take the maximum output voltage range of the device, given the design’s power rails, and divide by two. In Figure 24, the power rails are 2.7 V and the output is rail-to-rail. Enter these numbers into the equation: 2.7/2 = 1.35 V, and the minimum ideal slew rate is 1.35 V/μs.
While this data sheet gives only one audio example, many audio circuits are enhanced with the use of the AD8519. Examples include: active audio filters such as bass, treble, and equalizers; PWM filters at the output of audio DACs; buffers and summers for mixing stations; and gain stages for volume control.
30.9kΩ
There are a host of bridge configurations available to designers. For a complete analysis, look at the ubiquitous bridge and its different forms. Refer to the 1992 Amplifier Applications Guide1.
Figure 25 is a schematic of a two-element varying bridge. This configuration is commonly found in pressure and flow transduc- ers. With a two-element varying bridge, the signal is 2× as compared to a single-element varying bridge. The advantages of this type of bridge are gain setting range and single-supply application. Negative characteristics are nonlinear operation and required R matching. Given these sets of conditions, requirements, and characteristics, the AD8519 can be successfully used in this configuration because of its rail-to-rail output and low offset. Perhaps the greatest benefits of the AD8519, when used in the bridge configuration, are the advantages it can bring when placed in a remote bridge sensor. For example, the tiny SC70 and SOT-23 packages reduce the overall sensor size; low power allows for remote powering via batteries or solar cells, high output current drive to drive a long cable; and 2.7 V operation for two-cell operation.
2.7V
RF
R
R
R
AD8519
R
01756-025
RF
Figure 25. Two-Element Varying Bridge Amplifier
1 Adolfo Garcia and James Wong, Chapter 2, 1992, Amplifier Applications Guide.
MIC IN
1kΩ
1nF NPO
C1
1µF
3.09kΩ
2.7V
AD8519
CODEC LINE IN OR MIC IN
48kΩ
46.4kΩ 93.1kΩ
2.7V
01756-024
10µF ELECT
Figure 24. 10× Microphone Preamplifier
5.00 (0.1968)
4.80 (0.1890)
3.20
3.00
2.80
4.00 (0.1574)
3.80 (0.1497)
8
5
6.20 (0.2441)
4
1
5.80 (0.2284)
1.27 (0.0500) 0.50 (0.0196)
45°
8
3.20
3.00
2.80 1
5 5.15
4.90
4.65
4
0.25 (0.0098)
BSC
1.75 (0.0688)
1.35 (0.0532) 8°
0.25 (0.0099)
PIN 1
0.65 BSC
0.10 (0.0040)
0°
0.95
COPLANARITY
0.51 (0.0201)
1.27 (0.0500)
0.85
1.10 MAX
0.10
SEATING PLANE
0.31 (0.0122)
0.25 (0.0098)
0.17 (0.0067)
0.40 (0.0157)
0.75
0.80
0.15
0.38
0.23
8° 0.60
012407-A
COMPLIANT TO JEDEC STANDARDS MS-012-A A
0.00
0.22
0.08 0°
0.40
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
COPLANARITY 0.10
SEATING PLANE
Figure 26. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body (R-8)
Dimensions shown in millimeters and (inches)
COMPLIANT TO JEDEC STANDARDS MO-187-AA
Figure 27. 8-Lead Mini Small Outline Package [MSOP] (RM-8)
Dimensions shown in millimeters
1.35
1.25
1.15
2.20
2.00
1.80
5 4
1 2 3
2.40
2.10
1.80
2.90 BSC
5 4
1.60 BSC 2.80 BSC
1 2 3
PIN 1
0.65 BSC
PIN 1
1.00
0.90
1.10
0.80
0.40
0.10
1.30
1.90
0.95 BSC
0.70
0.46
1.15
0.90
BSC
0.10 MAX
0.30 0.15
SEATING PLANE
0.22
0.08
0.36
0.26
1.45 MAX
0.22 0.08
0.10 COPLANARITY 10°
COMPLIANT TO JEDEC STANDARDS MO-203-AA
0.15 MAX
0.50
0.30
SEATING PLANE
5° 0.60
0° 0.45
0.30
Figure 28. 5-Lead Thin Shrink Small Outline Transistor Package [SC70] (KS-5)
Dimensions shown in millimeters
COMPLIANT TO JEDEC STANDARDS MO-178-A A
Figure 29. 5-Lead Small Outline Transistor Package [SOT-23] (RJ-5)
Dimensions shown in millimeters
Model | Temperature Range | Package Description | Package Option | Branding Information |
AD8519AKS-REEL7 | −40°C to +125°C | 5-Lead SC70 | KS-5 | A3B |
−40°C to +125°C | 5-Lead SC70 | KS-5 | A11 | |
AD8519ART-REEL | −40°C to +125°C | 5-Lead SOT-23 | RJ-5 | A3A |
AD8519ART-REEL7 | −40°C to +125°C | 5-Lead SOT-23 | RJ-5 | A3A |
−40°C to +125°C | 5-Lead SOT-23 | RJ-5 | A3A# | |
−40°C to +125°C | 5-Lead SOT-23 | RJ-5 | A3A# | |
AD8519AR | −40°C to +125°C | 8-Lead SOIC_N | R-8 | |
AD8519AR-REEL | −40°C to +125°C | 8-Lead SOIC_N | R-8 | |
AD8519AR-REEL7 | −40°C to +125°C | 8-Lead SOIC_N | R-8 | |
−40°C to +125°C | 8-Lead SOIC_N | R-8 | ||
AD8519ARZ-REEL | −40°C to +125°C | 8-Lead SOIC_N | R-8 | |
−40°C to +125°C | 8-Lead SOIC_N | R-8 | ||
AD8529AR | −40°C to +125°C | 8-Lead SOIC_N | R-8 | |
AD8529AR-REEL | −40°C to +125°C | 8-Lead SOIC_N | R-8 | |
−40°C to +125°C | 8-Lead SOIC_N | R-8 | ||
−40°C to +125°C | 8-Lead SOIC_N | R-8 | ||
AD8529ARM-REEL | −40°C to +125°C | 8-Lead MSOP | RM-8 | A5A |
−40°C to +125°C | 8-Lead MSOP | RM-8 | A5A# |
1 Z = RoHS compliant part, # denotes RoHS compliant part may be top or bottom marked.
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AD8519AKSZ-REEL7 AD8519ARTZ-REEL7 AD8529ARZ AD8519ARTZ-REEL AD8529ARMZ-REEL AD8529ARZ- REEL