Dual, Low Power, Wideband, Low Noise, Rail-to-Rail Output, Operational Amplifiers ADA4691-2/ADA4692-2
FEATURES
Low power: 200 μA typical, 250 μA maximum Low distortion: 0.003% THD + N Low noise: 16 nV/√Hz typical 3.9 MHz bandwidth Slew rate: 1.4 V/μs typical Offset voltage: 500 μV typical Low offset voltage drift: 4 μV/°C maximum Very low input bias currents: 0.5 pA typical 2.7 V to 5 V single supply or ±1.35 V to ±2.5 V dual supply
PIN CONFIGURATIONS
OUT A 1 –IN 2 +IN 3 V– 4
8
V+ OUT B +IN B
07950-001
07950-002
ADA4692-2
TOP VIEW (Not to Scale)
7 6 5
–IN B
Figure 1. 8-Lead SOIC_N (R-8)
10 OUT A
APPLICATIONS
Portable audio: MP3, PDA, smart phone, notebook Portable instrumentation Portable medical devices Photodiode amplifiers Sensor amplifiers Low-side current sense ADC drivers Active filters Sample-and-hold Automotive sensors
–IN A 1 +IN A 2 V– 3
9 V+
ADA4691-2
TOP VIEW (Not to Scale)
8 OUT B 7 –IN B 6 +IN B
SD A 4
Figure 2. 10-Lead LFCSP (CP-10-11)
GENERAL DESCRIPTION
The ADA4691-2 and ADA4692-2 are dual, rail-to-rail output, single-supply amplifiers featuring low power, wide bandwidth, and low noise. The ADA4691-2 has two independent shutdown pins, allowing further reduction in supply current. These amplifiers are ideal for a wide variety of applications. Audio preamps, filters, IR/photodiode amplifiers, charge amps, and high impedance sensors all benefit from this combination of performance features. Applications for these amplifiers include consumer audio personal players with low noise and low distortion that provide enough gain and slew rate response over the audio band at low power. Industrial applications with high impedance sensors, such as pyroelectric sensors and other IR sensors, benefit from the high impedance input, low offset drift, and enough bandwidth and response for low gain applications. The ADA4691-2 and ADA4692-2 are specified over the extended industrial temperature range (−40°C to +125°C). The ADA4691-2 is available in a 10-lead LFCSP package, and the ADA4692-2 is available in an 8-lead SOIC package.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
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 ©2009 Analog Devices, Inc. All rights reserved.
SD B 5
ADA4691-2/ADA4692-2 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications ....................................................................................... 1 Pin Configurations ........................................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Electrical Characteristics—2.7 V Operation ............................ 3 Electrical Characteristics—5 V Operation................................ 4 Absolute Maximum Ratings............................................................ 6 Thermal Resistance .......................................................................6 ESD Caution...................................................................................6 Typical Performance Characteristics ..............................................7 Shutdown Operation ...................................................................... 15 Input Pin Characteristics ........................................................... 15 Input Threshold .......................................................................... 15 Outline Dimensions ....................................................................... 16 Ordering Guide .......................................................................... 16
REVISION HISTORY
ADA4691-2/ADA4692-2 Revision History 6/09—Rev. 0 to Rev. A Added ADA4691-2 Information Throughout .............................. 1 Added Figure 2, Renumbered Subsequent Figures ...................... 1 Changes to Table 1 ............................................................................ 3 Changes to Table 2 ............................................................................ 4 Changes to Table 4 ............................................................................ 6 Changes to Captions for Figure 40, Figure 41, Figure 43, Figure 44 .......................................................................................... 13 Added Shutdown Operations Section ......................................... 15 Updated Outline Dimensions ....................................................... 16 Changes to Ordering Guide .......................................................... 16 ADA4692-2 Revision History 3/09—Revision 0: Initial Version
Rev. A | Page 2 of 16
ADA4691-2/ADA4692-2 SPECIFICATIONS
ELECTRICAL CHARACTERISTICS—2.7 V OPERATION
VSY = 2.7 V, VCM = VSY/2, TA = 25°C, unless otherwise specified. Table 1.
Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current ADA4691 ADA4692 Input Offset Current Input Voltage Range Common-Mode Rejection Ratio ADA4691 ADA4692 Large Signal Voltage Gain ADA4691 ADA4692 ADA4691 ADA4692 Offset Voltage Drift Input Capacitance Differential Mode Common Mode Logic High Voltage (Enabled) Logic Low Voltage (Power-Down) Logic Input Current (Per Pin) OUTPUT CHARACTERISTICS Output Voltage High Symbol VOS IB −40°C < TA < +125°C −40°C < TA < +125°C IOS −40°C < TA < +125°C −40°C < TA < +125°C VCM = −0.3 V to +1.6 V VCM = −0.1 V to +1.6 V; −40°C < TA < +125°C VCM = −0.1 V to +1.6 V; −40°C < TA < +125°C RL = 2 kΩ, VOUT = 0.5 V to 2.2 V −40°C < TA < +85°C −40°C < TA < +85°C −40°C < TA < +125°C −40°C < TA < +125°C RL = 600 Ω, VOUT = 0.5 V to 2.2 V −40°C < TA < +125°C −0.3 70 62 70 90 80 85 67 73 85 1 Test Conditions/Comments VCM = −0.3 V to +1.6 V VCM = −0.1 V to +1.6 V; −40°C < TA < +125°C Min Typ 0.5 0.5 Max 2.5 3.5 5 350 325 5 225 +1.6 Unit mV mV pA pA pA pA pA V dB dB dB dB dB dB 95 0.8 2.5 7 −40°C < TA < +125°C −40°C < TA < +125°C −40°C < TA < +125°C, 0 V ≤ VSD ≤ 2.7 V RL = 2 kΩ to GND −40°C < TA < +125°C RL = 600 Ω to GND −40°C < TA < +125°C RL = 2 kΩ to VSY −40°C < TA < +125°C RL = 600 Ω to VSY −40°C < TA < +125°C VOUT = VSY or GND f = 1 MHz, AV = −100 −40°C < TA < +125°C, shutdown active, VSD = VSS VS = 2.7 V to 5.5 V −40°C < TA < +125°C VOUT = VSY/2 −40°C < TA < +125°C −40°C < TA < +125°C All amplifiers shut down, VShutDown = VSS −40°C < TA < +125°C +1.6 0.5 1 2.65 2.6 2.55 2.5 2.67 2.59 24 78 ±15 372 1 80 75 90 165 200 240 225 2 30 40 95 125 dB μV/°C pF pF V V μA V V V V mV mV mV mV mA Ω nA dB dB μA μA μA nA μA
CMRR
90
AVO
100
∆VOS/∆T CIN CINDM CINCM VIH VIL IIN VOH
3
Output Voltage Low
VOL
Short-Circuit Current Closed-Loop Output Impedance Output Pin Leakage Current POWER SUPPLY Power Supply Rejection Ratio Supply Current Per Amplifier ADA4691-2 ADA4692-2 Supply Current Shutdown Mode
ISC ZOUT
PSRR ISY
ISD
10
Rev. A | Page 3 of 16
ADA4691-2/ADA4692-2
Parameter DYNAMIC PERFORMANCE Slew Rate Slew Rate Settling Time to 0.1% Gain Bandwidth Product ADA4691 Gain Bandwidth Product ADA4692 Phase Margin Turn-on, Turn-off time NOISE PERFORMANCE Distortion Symbol SR SR tS GBP GBP ΦM Test Conditions/Comments RL = 600 Ω, CL = 20 pF, AV = +1 RL = 2 kΩ, CL = 20 pF, AV = +1 Step = 0.5 V, RL = 2 kΩ, 600 Ω RL = 1 MΩ, CL = 35 pF, AV = +1 RL = 1 MΩ, CL = 35 pF, AV = +1 RL = 1 MΩ, CL = 35 pF, AV = +1 RL = 600 Ω AV = −1, RL = 2 kΩ, f = 1 kHz, VIN rms = 0.15 V rms AV = −1, RL = 600 Ω, f = 1 kHz, VIN rms = 0.15 V rms AV = +1, RL = 2 kΩ, f = 1 kHz, VIN rms = 0.15 V rms AV = +1, RL = 600 Ω, f = 1 kHz, VIN rms = 0.15 V rms f = 0.1 Hz to 10 Hz f = 1 kHz f = 10 kHz Min Typ 1.1 1.4 1 3.6 3.9 49 1 0.009 0.01 0.006 0.007 3.1 16 13 Max Unit V/μs V/μs μs MHz MHz Degrees μs % % % % μV p-p nV/√Hz nV/√Hz
THD + N
Voltage Noise Voltage Noise Density
en p-p en
ELECTRICAL CHARACTERISTICS—5 V OPERATION
VSY = 5 V, VCM = VSY/2, TA = 25°C, unless otherwise specified. Table 2.
Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection Ratio ADA4691-2 ADA4629-2 Large Signal Voltage Gain ADA4691-2 ADA4692-2 ADA4691-2 ADA4692-2 ADA4691-2 and ADA46920-2 Offset Voltage Drift Input Capacitance Differential Mode Common Mode Logic High Voltage (Enabled) Logic Low Voltage (Power-Down) Logic Input Current (Per Pin) OUTPUT CHARACTERISTICS Output Voltage High Symbol VOS IB −40°C < TA < +125°C IOS −40°C < TA < +125°C −40°C < TA < +125°C VCM = −0.3 V to +3.9 V VCM = −0.1 V to +3.9 V; −40°C < TA < +125°C VCM = −0.1 V to +3.9 V; −40°C < TA < +125°C RL = 2 kΩ, VO = 0.5 V to 4.5 V, VCM = 0 V −40°C < TA < +85°C −40°C < TA < +85°C −40°C < TA < +125°C −40°C < TA < +125°C RL = 600 Ω, VO = 0.5 V to 4.5 V, VCM = 0 V −40°C < TA < +125°C −0.3 75 68 75 95 80 90 75 80 90 1 Test Conditions/Comments VCM = −0.3 V to +3.9 V VCM = −0.1 V to +3.9 V; −40°C < TA < +125°C Min Typ 0.5 0.5 Max 2.5 3.5 5 360 5 260 +3.9 Unit mV mV pA pA pA pA V dB dB dB dB dB dB dB dB dB μV/°C pF pF V V μA V V V
CMRR
98
AVO
110
∆VOS/∆T CINDM CINCM VIH VIL IIN VOH
100 1 2.5 7
4
−40°C < TA < +125°C −40°C < TA < +125°C −40°C < TA < +125°C, 0 V ≤ VSD ≤ 2.7 V R L = 2 kΩ −40°C ≤ TA ≤ +125°C RL = 600 Ω to GND
Rev. A | Page 4 of 16
+2.0 0.8 1 4.95 4.90 4.85 4.97 4.88
ADA4691-2/ADA4692-2
Parameter Output Voltage Low Symbol VOL Test Conditions/Comments −40°C ≤ TA ≤ +125°C RL = 2 kΩ −40°C ≤ TA ≤ +125°C RL = 600 Ω −40°C ≤ TA ≤ +125°C VOUT = VSY or GND ADA4691-2, f = 1 MHz, AV = −100 ADA4691-2, f = 1 MHz, AV = −100 −40°C < TA < +125°C, shutdown active, VSD = VSS VSY = 2.7 V to 5.5 V −40°C ≤ TA ≤ +125°C VOUT = VSY/2 −40°C ≤ TA ≤ +125°C −40°C ≤ TA ≤ +125°C All amplifiers shutdown, VShutDown = VSS −40°C ≤ TA ≤ +125°C RL = 2 kΩ, 600 Ω, CL = 20 pF, AV = +1 VIN = 2 V step, RL = 2 kΩ or 600 Ω RL = 1 MΩ, CL = 35 pF, AV = +1 RL = 1 MΩ, CL = 35 pF, AV = +1 RL = 600 Ω AV = −1, RL = 2 kΩ, f = 1 kHz, VIN rms = 0.8 V rms AV = −1, RL = 600 Ω, f = 1 kHz, VIN rms = 0.8 V rms AV = +1, RL = 2 kΩ, f = 1 kHz, VIN rms = 0.8 V rms AV = +1, RL = 600 Ω, f = 1 kHz, VIN rms = 0.8 V rms f = 0.1 Hz to 10 Hz f = 1 kHz f = 10 kHz Min 4.80 Typ 28 90 ±55 364 246 1 80 75 90 180 225 275 250 2 1.3 1.5 3.6 52 1 0.008 0.006 0.003 0.001 3.2 16 13 Max 35 45 110 140 Unit V mV mV mV mV mA Ω Ω nA dB dB μA μA μA nA
uA
Short-Circuit Limit Closed-Loop Output Impedance Closed-Loop Output Impedance Output Pin Leakage Current POWER SUPPLY Power Supply Rejection Ratio Supply Current per Amplifier ADA4691-2 ADA4692-2 Supply Current Shutdown Mode DYNAMIC PERFORMANCE Slew Rate Settling Time to 0.1% Gain Bandwidth Product Phase Margin Turn-on, Turn-off time NOISE PERFORMANCE Distortion
ISC ZOUT ZOUT
PSRR ISY
ISD
10
SR tS GBP ΦM
V/μs μs MHz Degrees μs % % % % μV p-p nV/√Hz nV/√Hz
THD + N
Voltage Noise Voltage Noise Density
en p-p en en
Rev. A | Page 5 of 16
ADA4691-2/ADA4692-2 ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter Supply Voltage Input Voltage Input Current1 Shutdown Pin Rise/Fall times Differential Input Voltage2 Output Short-Circuit Duration to GND Temperature Storage Temperature Range Operating Temperature Range Junction Temperature Range Lead Temperature (Soldering, 60 sec)
1
THERMAL RESISTANCE
Rating 6V VSS − 0.3 V to VDD +0.3 V ±10 mA 50 μs maximum ±VSY Indefinite −65°C to +150°C −40°C to +125°C −65°C to +150°C 300°C
θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages and measured using a standard 4-layer board, unless otherwise specified. Table 4. Thermal Resistance
Package Type 8-Lead SOIC_N (R-8) 10-Lead LFCSP (CP-10-11) θJA 155 88 θJC 45 32 Unit °C/W °C/W
ESD CAUTION
Input pins have clamp diodes to the supply pins. Limit the input current to 10 mA or less whenever the input signal exceeds the power supply rail by 0.3 V. 2 Differential input voltage is limited to 5 V or the supply voltage, whichever is less.
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.
Rev. A | Page 6 of 16
ADA4691-2/ADA4692-2 TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, unless otherwise noted.
350 ADA4692-2 VSY = 2.7V TA = 25°C 300 –0.3V ≤ VCM ≤ +1.6V SIGNIFIES CENTER OF BIN 250 200 150 100 50
700 ADA4692-2 VSY = 5V TA = 25°C 600 –0.3V ≤ VCM ≤ +3.9V SIGNIFIES CENTER OF BIN 500 400 300 200 100 0 –2.0 –1.6 –1.2 –0.8 –0.4
NUMBER OF AMPLIFIERS
07950-003
NUMBER OF AMPLIFIERS
0
0.4
0.8
1.2
1.6
2.0
VOS (mV)
Figure 3. Input Offset Voltage Distribution
30
30
Figure 6. Input Offset Voltage Distribution
25
NUMBER OF AMPLIFIERS
NUMBER OF AMPLIFIERS
ADA4692-2 VSY = ±1.35V –40°C < TA < +125°C SIGNIFIES CENTER OF BIN
25
ADA4692-2 VSY = ±2.5V –40°C < TA < +125°C SIGNIFIES CENTER OF BIN
20
20
15
15
10
10
5
5
07950-004
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
TCVOS (µV/°C)
TCVOS (µV/°C)
Figure 4. Input Offset Voltage Drift Distribution
2.0 1.5 1.0 0.5 2.0 1.5 1.0 0.5
Figure 7. Input Offset Voltage Drift Distribution
ADA4692-2 VSY = 2.7V TA = 25°C
ADA4692-2 VSY = 5V TA = 25°C
VOS (mV)
0 –0.5 –1.0 –1.5 –2.0 –0.5
VOS (mV)
0 –0.5 –1.0 –1.5 –2.0 –0.5
07950-005
0
0.5
1.0 VCM (V)
1.5
2.0
2.5
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
VCM (V)
Figure 5. Input Offset Voltage vs. Common-Mode Voltage
Figure 8. Input Offset Voltage vs. Common-Mode Voltage
Rev. A | Page 7 of 16
07950-008
07950-007
0
0
07950-006
ADA4691-2/ADA4692-2
1k ADA4692-2 VSY = ±1.35V TA = 25°C AVERAGE 20 CHANNELS
1k ADA4692-2 VSY = ±2.5V TA = 25°C AVERAGE 20 CHANNELS
100
100
10
IB (pA)
10
IB (pA)
1
1
0.1
0.1
07950-009
35
45
55
65
75
85
95
105
115
125
35
45
55
65
75
85
95
105
115
125
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 9. Input Bias Current vs. Temperature
1k TA = 125°C 100 1k
Figure 12. Input Bias Current vs. Temperature
TA = 125°C 100 ADA4692-2 VSY = 5V AVERAGE 20 CHANNELS
10
IB (pA)
TA = 85°C
IB (pA)
10 TA = 85°C 1
1 TA = 25°C
0.1
0.01
0.1 ADA4692-2 VSY = 2.7V AVERAGE 20 CHANNELS
07950-010
TA = 25°C
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7
0
0.5
1.0
1.5
2.0
2.5 VCM (V)
3.0
3.5
4.0
4.5
5.0
VCM (V)
Figure 10. Input Bias Current vs. Common-Mode Voltage
10k
OUTPUT SATURATION VOLTAGE (mV)
Figure 13. Input Bias Current vs. Common-Mode Voltage
10k
OUTPUT SATURATION VOLTAGE (mV)
1k
ADA4692-2 VSY = ±1.35V VOH = (V+) – VOUT (SOURCING)
1k
TA = +125°C
ADA4692-2 VSY = ±2.5V VOH = (V+) – VOUT (SOURCING)
TA = +125°C
100 TA = +85°C 10 TA = +25°C TA = –40°C
100 TA = +85°C 10 TA = +25°C 1 TA = –40°C
1
0.1
0.1
07950-011
0.01
0.1 ILOAD (mA)
1
10
100
0.01
0.1 ILOAD (mA)
1
10
100
Figure 11. Output Voltage (VOH) to Supply Rail vs. Load Current
Figure 14. Output Voltage (VOH) to Supply Rail vs. Load Current
Rev. A | Page 8 of 16
07950-014
0.01 0.001
0.01 0.001
07950-013
0.001
0.01
07950-012
0.01 25
0.01 25
ADA4691-2/ADA4692-2
10k
OUTPUT SATURATION VOLTAGE (mV) OUTPUT SATURATION VOLTAGE (mV)
1k
ADA4692-2 VSY = ±1.35V VOL = VOUT – (V–) (SINKING)
10k
1k
TA = +125°C
ADA4692-2 VSY = ±2.5V VOL = VOUT – (V–) (SINKING)
TA = +125°C
100 TA = +85°C 10 TA = +25°C
100 TA = +85°C 10 TA = +25°C 1 TA = –40°C
1
TA = –40°C
0.1
0.1
0.01
0.1 ILOAD (mA)
1
10
100
0.01
0.1 ILOAD (mA)
1
10
100
Figure 15. Output Voltage (VOL) to Supply Rail vs. Load Current
120 100 80 60
GAIN (dB)
Figure 18. Output Voltage (VOL) to Supply Rail vs. Load Current
120 100 80
PHASE (Degrees)
120 100 80 CL = 20pF 60 40 20 0 ADA4692-2 VSY = ±1.35V TA = 25°C AV = –1 10k 100k FREQUENCY (Hz) CL = 200pF –20 –40
07950-021
120 100 80 CL = 20pF
PHASE (Degrees)
07950-025 07950-024
60
GAIN (dB)
60 40 20 0
40 20 0 –20 –40
40 20 0 –20 –40 ADA4692-2 VSY = ±2.5V TA = 25°C AV = –1 10k 100k FREQUENCY (Hz) CL = 200pF
–20 –40 –60 10M
–60 1k
1M
–60 10M
–60 1k
1M
Figure 16. Open-Loop Gain and Phase vs. Frequency
50 40 30 20
GAIN (dB)
Figure 19. Open-Loop Gain and Phase vs. Frequency
50
AV = +100
40 30
AV = +100
AV = +10
GAIN (dB)
20 10
AV = +10
10 AV = +1 0 –10 –20 ADA4692-2 VSY = ±1.35V TA = 25°C RL = 600Ω
07950-022
AV = +1 0 –10 –20 ADA4692-2 VSY = ±2.5V TA = 25°C RL = 600Ω 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
–30 10
100
1k
10k
100k
1M
10M
–30 10
FREQUENCY (Hz)
Figure 17. Closed-Loop Gain vs. Frequency
Figure 20. Closed-Loop Gain vs. Frequency
Rev. A | Page 9 of 16
07950-018
07950-015
0.01 0.001
0.01 0.001
ADA4691-2/ADA4692-2
1k 1k
100 AV = –100
ZOUT (Ω) ZOUT (Ω)
100 AV = –100 10 AV = –10 1 AV = –1
10
1
AV = –10
0.1
AV = –1 ADA4692-2 VSY = ±1.35V TA = 25°C
07950-023
0.1 ADA4692-2 VSY = ±2.5V TA = 25°C 1k 10k 100k 1M 10M FREQUENCY (Hz)
07950-026 07950-031 07950-030
0.01 100
1k
10k
100k
1M
10M
0.01 100
FREQUENCY (Hz)
Figure 21. Output Impedance vs. Frequency
120 120
Figure 24. Output Impedance vs. Frequency
100
100
80
CMRR (dB) CMRR (dB)
80
60
60
40
40
20
07950-027
0 100
ADA4692-2 VSY = ±1.35V TA = 25°C 1k 10k 100k 1M 10M FREQUENCY (Hz)
20
0 100
ADA4692-2 VSY = ±2.5V TA = 25°C 1k 10k 100k 1M 10M FREQUENCY (Hz)
Figure 22. CMRR vs. Frequency
100 100
Figure 25. CMRR vs. Frequency
PSRR–
PSRR+
80 PSRR+ 60
PSRR (dB) PSRR (dB)
80 PSRR– 60
40
40
20
20
0
1k
10k
100k
1M
10M
07950-028
–20 100
ADA4692-2 VSY = ±1.35V TA = 25°C FREQUENCY (Hz)
0
–20 100
ADA4692-2 VSY = ±2.5V TA = 25°C 1k 10k 100k 1M 10M FREQUENCY (Hz)
Figure 23. PSRR vs. Frequency
Figure 26. PSRR vs. Frequency
Rev. A | Page 10 of 16
ADA4691-2/ADA4692-2
1k 1k
VOLTAGE NOISE DENSITY (nV/ Hz)
VOLTAGE NOISE DENSITY (nV/ Hz)
100
100
07950-029
1
10
100
1k
10k
1
10
100
1k
10k
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 27. Voltage Noise Density vs. Frequency
50 45 40 35
OVERSHOOT (%)
Figure 30. Voltage Noise Density vs. Frequency
45 40 35
OVERSHOOT (%)
ADA4692-2 VSY = ±1.35V VIN = 100mV p-p AV = +1 RL = 2kΩ TA = 25°C
30 25 20
ADA4692-2 VSY = ±2.5V VIN = 100mV p-p AV = +1 RL = 2kΩ TA = 25°C OVERSHOOT+
30 OVERSHOOT+ 25 OVERSHOOT– 20 15 10 5
07950-033
OVERSHOOT– 15 10 5
07950-036
0 10
100 CAPACITANCE (pF)
1k
0 10
100 CAPACITANCE (pF)
1k
Figure 28. Small Signal Overshoot vs. Load Capacitance
Figure 31. Small Signal Overshoot vs. Load Capacitance
OUTPUT (500mV/DIV)
07950-034
TIME (2µs/DIV)
TIME (2µs/DIV)
Figure 29. Large Signal Transient Response
Figure 32. Large Signal Transient Response
Rev. A | Page 11 of 16
07950-037
ADA4692-2 VSY = ±1.35V GAIN = +1 RL = 2kΩ CL = 300pF TA = 25°C
OUTPUT (500mV/DIV)
ADA4692-2 VSY = ±2.5V GAIN = +1 RL = 2kΩ, CL = 300pF TA = 25°C
07950-032
10 0.1
ADA4692-2 VSY = ±1.35V TA = 25°C
10 0.1
ADA4692-2 VSY = ±2.5V TA = 25°C
ADA4691-2/ADA4692-2
T
OUTPUT (20mV/DIV)
07950-035
TIME (2µs/DIV)
TIME (2µs/DIV)
Figure 33. Small Signal Transient Response
Figure 36. Small Signal Transient Response
OUTPUT (1µV/DIV)
OUTPUT (1µV/DIV)
07950-040
TIME (1s/DIV)
TIME (1s/DIV)
Figure 34. 0.1 Hz to 10 Hz Noise
250
Figure 37. 0.1 Hz to 10 Hz Noise
250
ADA4692-2 TA = +85°C
TA = +125°C
ADA4692-2
200
225
TA = +25°C
ISY/AMPLIFIER (µA)
ISY/CHANNEL (µA)
150 TA = –40°C 100
200 VSY = ±2.5V 175 VSY = ±1.35V 150
50
0
0.5
1.0
1.5
2.0
2.5 VSY (V)
3.0
3.5
4.0
4.5
5.0
07950-135
–25
–10
5
20
35
50
65
80
95
110
125
TEMPERATURE (°C)
Figure 35. Supply Current per Amplifier vs. Supply Voltage
Figure 38. Supply Current per Channel vs. Temperature
Rev. A | Page 12 of 16
07950-138
0
125 –40
07950-043
ADA4692-2 VSY = ±1.35V GAIN = +1M TA = 25°C
ADA4692-2 VSY = ±2.5V GAIN = +1M TA = 25°C
07950-038
ADA4692-2 VSY = ±1.35V GAIN = +1 RL = 2kΩ CL = 200pF TA = 25°C
OUTPUT (20mV/DIV)
ADA4692-2 VSY = ±2.5V GAIN = +1 RL = 2kΩ CL = 200pF TA = 25°C
ADA4691-2/ADA4692-2
1 ADA4692-2 VSY = ±1.35V AV = –1 TA = 25°C 1 ADA4692-2 VSY = ±2.5V AV = –1 TA = 25°C
0.1
THD + N (%) THD + N (%)
0.1 RL = 600Ω RL = 2kΩ RL = 600Ω RL = 2kΩ
0.01
0.01
07950-042
100
1k FREQUENCY (Hz)
10k
20k
100
1k FREQUENCY (Hz)
10k
20k
Figure 39. THD + Noise vs. Frequency
Figure 42. THD + Noise vs. Frequency
50mV/DIV
50mV/DIV
1V/DIV
07950-050
TIME (4µs/DIV)
TIME (4µs/DIV)
Figure 40. Positive Overload Recovery
Figure 43. Positive Overload Recovery
50mV/DIV
50mV/DIV
1V/DIV 1V/DIV ADA4692-2 VSY = ±2.5V AV = –100 TA = 25°C TIME (4µs/DIV)
TIME (4µs/DIV)
Figure 41. Negative Overload Recovery
Figure 44. Negative Overload Recovery
Rev. A | Page 13 of 16
07950-053
07950-052
ADA4692-2 VSY = ±1.35V TA = 25°C
07950-051
ADA4692-2 VSY = ±1.35V TA = 25°C
ADA4692-2 VSY = ±2.5V AV = –100 TA = 25°C
1V/DIV
07950-045
0.001 10
0.001 10
ADA4691-2/ADA4692-2
200mV/DIV
1V/DIV
10mV/DIV ADA4692-2 VSY = ±1.35V RL = 2kΩ TA = 25°C TIME (1µs/DIV)
20mV/DIV ADA4692-2 VSY = ±2.5V RL = 2kΩ TA = 25°C TIME (1µs/DIV)
ERROR BAND
Figure 45. Positive Settling Time to 0.1%
Figure 48. Positive Settling Time to 0.1%
200mV/DIV
1V/DIV
ERROR BAND 10mV/DIV ADA4692-2 VSY = ±1.35V RL = 2kΩ TA = 25°C TIME (1µs/DIV)
ERROR BAND 20mV/DIV ADA4692-2 VSY = ±2.5V RL = 2kΩ TA = 25°C TIME (1µs/DIV)
Figure 46. Negative Settling Time to 0.1%
–80
CS (dB) = 20 log (VOUT/100 = VIN) V+ 3 VIN + – 0 2 V+ V– V– U1 R3 600Ω 0
Figure 49. Negative Settling Time to 0.1%
R1 100kΩ V– U2 5 V– V+ V+ 6 7 0 R2 1kΩ
–90
CHANNEL SEPARATION (dB)
–100
0
–110
–120 ADA4692-2 VSY = ±2.5V VIN = 2.8V p-p AV = +1 TA = 25°C 1k 10k FREQUENCY (Hz) 100k
07950-140
–130
–140 100
Figure 47. Channel Separation vs. Frequency
Rev. A | Page 14 of 16
07950-057
07950-056
07950-055
07950-054
ERROR BAND
ADA4691-2/ADA4692-2 SHUTDOWN OPERATION
INPUT PIN CHARACTERISTICS
The ADA4691-2 has a classic CMOS logic inverter input for each shutdown pin, as shown in Figure 50.
VDD P-CHANNEL OUTPUT
07950-149
SDA, B
INPUT
N-CHANNEL
ISY = 724mV/1k = 724µA
Figure 50. CMOS Inverter
With slowly changing inputs, the top transistor and bottom transistor may be slightly on at the same time, increasing the supply current. This can be avoided by driving the input with a digital logic output having fast rise and fall times. Figure 51 through Figure 53 show the supply current for both sections switching simultaneously with rise times of 1 μs, 10 μs, and 1 ms. Clearly, the rise and fall times should be faster than 10 us. Using an RC time constant to enable/disable shutdown is not recommended.
TIME (400µs/DIV)
Figure 53. Shutdown Pin Rise Time = 1 ms
INPUT THRESHOLD
The input threshold is approximately 1.2 V above the V− pin when operating on ground and +5 V, and 0.9 V when operating on 2.7 V (see Figure 54 and Figure 55). The threshold is relatively stable over temperature. For operation on split supplies, the logic swing may have to be level shifted.
500 ADA4691-2 450 TA = 25°C VSY = 5V
ISY = 196mV/1k = 196µA
400 350 300 TA = +125°C TA = +85°C
ISY (µA)
250 200 150
SDA, B DUT OUTPUT
07950-150
100 50 0 0.5 1.0
TA = –40°C
TA = +25°C
TIME (400µs/DIV)
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
SD VOLTAGE (V)
Figure 54. Supply Current vs. Temperature, VSY = 5 V
300 ISY = 192mV/1k = 196µA ADA4691-2 VSY = 2.7V
250
200
ISY (µA)
TA = +125°C 150
TA = +85°C
SDA, B DUT OUTPUT
07950-151
100 TA = –40°C 50 TA = +25°C
TIME (400µs/DIV)
Figure 52. Shutdown Pin Rise Time = 10 μs
0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 SD VOLTAGE (V)
07950-156
0
Figure 55. Supply Current vs. Temperature, VSY = 2.7 V
Rev. A | Page 15 of 16
07950-155
Figure 51. Shutdown Pin Rise Time = 1 μs
0
07950-152
DUT OUTPUT
ADA4691-2/ADA4692-2 OUTLINE DIMENSIONS
5.00 (0.1968) 4.80 (0.1890)
4.00 (0.1574) 3.80 (0.1497)
8 1
5 4
6.20 (0.2441) 5.80 (0.2284)
1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE
1.75 (0.0688) 1.35 (0.0532)
0.50 (0.0196) 0.25 (0.0099) 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157)
45°
0.51 (0.0201) 0.31 (0.0122)
COMPLIANT TO JEDEC STANDARDS MS-012-A A 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.
Figure 56. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches)
2.00 BSC SQ 0.50 0.45 0.40
9 8 10 1
PIN 1 INDEX AREA
PIN 1 INDICATOR
0.30 0.25 0.18
TOP VIEW
6 5 4 BOTTOM VIEW
3
0.60 0.55 0.50 SEATING PLANE 0.50 BSC
0.05 MAX 0.02 NOM COPLANARITY 0.05 0.20 REF
081308-D
Figure 57. 10-Lead Lead Frame Chip Scale Package [LFCSP_UQ] 2 mm × 2 mm Body, Ultra Thin Quad (CP-10-11) Dimensions shown in millimeters
ORDERING GUIDE
Model ADA4691-2ACPZ-R71 ADA4691-2ACPZ-RL1 ADA4691-2ACPZ-R21 ADA4692-2ARZ 1 ADA4692-2ARZ-R71 ADA4692-2ARZ-RL1
1
Temperature Range −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C
Package Description 10-Lead_LFCSP_UQ 10-Lead_LFCSP_UQ 10-Lead_LFCSP_UQ 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N
Package Option CP-10-11 CP-10-11 CP-10-11 R-8 R-8 R-8
012407-A
Branding Code A2 A2 A2
Z = RoHS Compliant Part.
©2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07950-0-6/09(A)
Rev. A | Page 16 of 16
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