Datasheet

ManualsBrandsANALOG DEVICES ManualsLinear ICsLinear IC - Op-amp Voltage feedback LFCSP 16 WQ (3x3)

Low Power, 3.6 MHz, Low Noise, Rail-to-

Rail Output, Operational Amplifiers

ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4

Rev. C

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FEATURES

Low power: 180 μA typical

Very low input bias currents: 0.5 pA typical

Low noise: 16 nV/√Hz typical

3.6 MHz bandwidth

Offset voltage: 500 μV typical

Low offset voltage drift: 4 μV/°C maximum

Low distortion: 0.003% THD + N

2.7 V to 5 V single supply or ±1.35 V to ±2.5 V dual supply

Available in very small 2 mm × 2 mm LFCSP packages

APPLICATIONS

Photodiode amplifiers

Sensor amplifiers

Portable medical and instrumentation

Portable audio: MP3s, PDAs, and smartphones

Communications

Low-side current sense

ADC drivers

Active filters

Sample-and-hold

GENERAL DESCRIPTION

The ADA4691-2/ADA4692-2 are dual and the ADA4691-4/

ADA4692-4 are the quad 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. The ADA4691-4 is a quad

with dual shutdown pins each controlling a pair of amplifiers

and is available in the 16-lead LFCSP. The ADA4692-4 is a quad

version without shutdown.

These amplifiers are ideal for a wide variety of applications.

Audio, filters, photodiode amplifiers, and charge amplifiers, all

benefit from this combination of performance and features.

Additional applications for these amplifiers include portable

consumer audio players with low noise and low distortion that

provide high gain and slew rate response over the audio band at

low power. Industrial applications with high impedance sensors,

such as pyroelectric and IR sensors, benefit from the high

impedance and low 0.5 pA input bias, low offset drift, and

enough bandwidth and response for low gain applications.

The ADA4691/ADA4692 family is fully specified over the extended

industrial temperature range (−40°C to +125°C). The ADA4691-2

is available in a 10-lead LFCSP and a 9-ball WLCSP. The ADA4692-2

is available in an 8-lead SOIC and 8-lead LFCSP. The ADA4691-4 is

available in a 16-lead LFCSP. The ADA4692-4 is available in a 14-lead

TSSOP. For pin configurations, see the Pin Configurations section.

0.1

0.01

0.001

10 100 1k 10k 20k

THD + N (%)

FREQUENCY (Hz)

ADA4692-2

= ±2.5V

= –1

= 25°C

07950-142

= 600Ω

= 2kΩ

Figure 1. THD + Noise vs. Frequency

–

–90

–100

–110

–120

–130

–140

100 1k 10k 100k

CHANNEL SEPARATION (dB)

FREQUENCY (Hz)

07950-141

ADA4692-2

= ±2.5V

= 2.8V p-p

= +1

= 25°C

Figure 2. Channel Separation vs. Frequency

Table 1.

Micropower Low Power Low Power with Shutdown Standard Op Amp With Shutdown High Bandwidth

Single AD8613 AD8591 AD8691

Dual AD8617 ADA4692-2 ADA4691-2 AD8592 AD8692

Quad AD8619 ADA4692-4 ADA4691-4 AD8594 AD8694

Summary of content (20 pages)

PAGE 1
Low Power, 3.6 MHz, Low Noise, Rail-toRail Output, Operational Amplifiers ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 1 ADA4692-2 VSY = ±2.5V AV = –1 TA = 25°C APPLICATIONS 0.1 THD + N (%) Photodiode amplifiers Sensor amplifiers Portable medical and instrumentation Portable audio: MP3s, PDAs, and smartphones Communications Low-side current sense ADC drivers Active filters Sample-and-hold RL = 600Ω RL = 2kΩ 0.01 0.001 10 GENERAL DESCRIPTION These amplifiers are ideal for a wide variety of applications.
PAGE 2
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 TABLE OF CONTENTS Features .............................................................................................. 1 ESD Caution...................................................................................6 Applications ....................................................................................... 1 Pin Configurations ............................................................................7 General Description ............................
PAGE 3
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 SPECIFICATIONS ELECTRICAL CHARACTERISTICS—2.7 V OPERATION VSY = 2.7 V, VCM = VSY/2, TA = 25°C, unless otherwise specified. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Dual (ADA469x-2) Quad (ADA469x-4) Offset Voltage Drift Input Bias Current Symbol Test Conditions/Comments VOS 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 −40°C < TA < +125°C ΔVOS/ΔT Min Typ Max Unit 0.5 2.5 3.5 4.
PAGE 4
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 Parameter DYNAMIC PERFORMANCE Slew Rate Symbol Test Conditions/Comments SR Settling Time to 0.1% Gain Bandwidth Product Phase Margin Turn-On/Turn-Off Time NOISE PERFORMANCE Distortion tS GBP ΦM 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 = 600 Ω 1.1 1.4 1 3.6 49 1 V/μs V/μs μs MHz Degrees μs AV = −1, RL = 2 kΩ, f = 1 kHz, VIN rms = 0.15 V rms 0.
PAGE 5
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 Parameter OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Short-Circuit Limit Closed-Loop Output Impedance Output Pin Leakage Current POWER SUPPLY Power Supply Rejection Ratio Symbol Test Conditions/Comments Min Typ VOH RL = 2 kΩ −40°C ≤ TA ≤ +125°C RL = 600 Ω to GND −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
PAGE 6
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 4. 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) Rating 6V VSS − 0.3 V to VDD + 0.
PAGE 7
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 PIN CONFIGURATIONS OUT A 1 OUT B V+ OUT A –IN A 2 A1 A2 A3 +IN A 3 –IN B SD A/B –IN A B1 B2 B3 +IN B V– +IN A C1 C2 C3 8 V+ ADA4692-2 5 +IN B 07950-058 ADA4692-2 +IN 3 TOP VIEW (Not to Scale) V– 4 Figure 3. 9-Ball Wafer Level Chip Scale WLCSP (CB-9-3) OUT A 1 V+ 4 +IN B 3 TOP VIEW (Not to Scale) 12 +IN D 11 V– 10 +IN C 9 –IN C OUT B 7 8 OUT C 07950-002 Figure 8.
PAGE 8
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. 700 ADA4692-2 VSY = 2.7V T 300 A = 25°C –0.3V ≤ VCM ≤ +1.6V SIGNIFIES CENTER OF BIN 250 NUMBER OF AMPLIFIERS 200 150 100 50 ADA4692-2 VSY = 5V 600 TA = 25°C –0.3V ≤ VCM ≤ +3.9V SIGNIFIES CENTER OF BIN 500 400 300 200 0 0.4 0.8 1.2 1.6 2.0 VOS (mV) 0 –2.0 –1.6 –1.2 –0.8 –0.4 07950-003 0 –2.0 –1.6 –1.2 –0.8 –0.4 Figure 9. Input Offset Voltage Distribution 30 15 10 1.2 1.6 2.
PAGE 9
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 1k 1k ADA4692-2 VSY = ±1.35V TA = 25°C AVERAGE 20 CHANNELS 100 ADA4692-2 VSY = ±2.5V TA = 25°C AVERAGE 20 CHANNELS 100 10 0.1 0.1 35 45 55 65 75 85 95 105 115 125 TEMPERATURE (°C) 0.01 25 07950-009 0.01 25 35 45 55 65 75 85 95 105 115 125 4.5 5.0 100 TEMPERATURE (°C) Figure 15. Input Bias Current vs. Temperature 07950-012 1 07950-013 1 07950-014 IB (pA) IB (pA) 10 Figure 18. Input Bias Current vs.
PAGE 10
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 10k 100 TA = +85°C 10 TA = +25°C 1 TA = –40°C 0.1 0.01 0.1 1 10 100 ILOAD (mA) TA = +85°C 10 TA = +25°C 1 TA = –40°C 0.1 0.01 0.1 1 10 100 ILOAD (mA) Figure 21. Output Voltage (VOL) to Supply Rail vs. Load Current Figure 24. Output Voltage (VOL) to Supply Rail vs.
PAGE 11
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 1k 1k 100 100 AV = –100 1 ZOUT (Ω) ZOUT (Ω) AV = –100 10 AV = –10 10 AV = –10 1 AV = –1 AV = –1 0.1 ADA4692-2 VSY = ±1.35V TA = 25°C 1k 10k 100k 1M 10M FREQUENCY (Hz) 0.01 100 07950-023 0.01 100 120 120 100 100 80 80 60 1M 10M 60 40 20 ADA4692-2 VSY = ±1.35V TA = 25°C 1k 10k 100k 1M 10M FREQUENCY (Hz) ADA4692-2 VSY = ±2.5V TA = 25°C 0 100 07950-027 0 100 1k 100 10k 100k 1M 10M 1M 10M FREQUENCY (Hz) Figure 28.
PAGE 12
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 100 ADA4692-2 VSY = ±1.35V TA = 25°C 10 0.1 1 10 100 1k 100 ADA4692-2 VSY = ±2.5V TA = 25°C 10k 10 0.1 FREQUENCY (Hz) 35 10k ADA4692-2 VSY = ±2.5V VIN = 100mV p-p AV = +1 RL = 2kΩ TA = 25°C 40 35 30 OVERSHOOT+ 25 OVERSHOOT– 20 15 30 OVERSHOOT+ 25 20 OVERSHOOT– 15 10 10 100 1k CAPACITANCE (pF) 0 10 07950-033 0 10 07950-034 TIME (2µs/DIV) 1k Figure 37. Small Signal Overshoot vs. Load Capacitance OUTPUT (500mV/DIV) Figure 34.
PAGE 13
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 OUTPUT (20mV/DIV) ADA4692-2 VSY = ±2.5V GAIN = +1 RL = 2kΩ CL = 200pF TA = 25°C 07950-035 ADA4692-2 VSY = ±1.35V GAIN = +1 RL = 2kΩ CL = 200pF TA = 25°C TIME (2µs/DIV) 07950-038 OUTPUT (20mV/DIV) T TIME (2µs/DIV) Figure 42. Small Signal Transient Response OUTPUT (1µV/DIV) OUTPUT (1µV/DIV) Figure 39. Small Signal Transient Response TIME (1s/DIV) TIME (1s/DIV) Figure 43. 0.1 Hz to 10 Hz Noise Figure 40. 0.
PAGE 14
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 1 ADA4692-2 VSY = ±1.35V AV = –1 TA = 25°C THD + N (%) 0.1 RL = 2kΩ 0.001 10 100 1k RL = 2kΩ 0.01 10k 20k FREQUENCY (Hz) 07950-042 0.01 RL = 600Ω Figure 45. THD + Noise vs. Frequency 0.001 10 100 1k 10k 20k FREQUENCY (Hz) Figure 48. THD + Noise vs. Frequency 50mV/DIV 50mV/DIV 1V/DIV ADA4692-2 VSY = ±2.5V AV = –100 TA = 25°C 07950-050 ADA4692-2 VSY = ±1.35V TA = 25°C TIME (4µs/DIV) 1V/DIV TIME (4µs/DIV) Figure 46.
PAGE 15
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 1V/DIV 200mV/DIV TIME (1µs/DIV) TIME (1µs/DIV) Figure 51. Positive Settling Time to 0.1% Figure 54. Positive Settling Time to 0.1% 200mV/DIV 1V/DIV ERROR BAND ERROR BAND TIME (1µs/DIV) ADA4692-2 VSY = ±2.5V RL = 2kΩ TA = 25°C 07950-056 ADA4692-2 VSY = ±1.35V RL = 2kΩ TA = 25°C TIME (1µs/DIV) Figure 52. Negative Settling Time to 0.
PAGE 16
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 SHUTDOWN OPERATION INPUT PIN CHARACTERISTICS The ADA4691-2 has a classic CMOS logic inverter input for each shutdown pin, as shown in Figure 56. SD A, SD B VDD P-CHANNEL N-CHANNEL 07950-149 OUTPUT INPUT ISY = 724mV/1k = 724µA Figure 56. CMOS Inverter DUT OUTPUT 07950-152 With slowly changing inputs, the top transistor and bottom transistor may be slightly on at the same time, increasing the supply current.
PAGE 17
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 OUTLINE DIMENSIONS 3.10 3.00 SQ 2.90 PIN 1 INDICATOR 0.30 0.23 0.18 0.50 BSC 13 PIN 1 INDICATOR 16 1 12 1.75 1.60 SQ 1.55 EXPOSED PAD 9 TOP VIEW 0.80 0.75 0.70 4 5 8 BOTTOM VIEW 0.05 MAX 0.02 NOM COPLANARITY 0.08 0.20 REF SEATING PLANE 0.20 MIN FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET. 070209-C 0.50 0.40 0.30 COMPLIANT TO JEDEC STANDARDS MO-220-WEED. Figure 62.
PAGE 18
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 PIN 1 INDEX AREA 0.50 0.45 0.40 2.00 BSC SQ 9 PIN 1 INDICATOR 10 8 0.30 0.25 0.18 1 6 3 5 TOP VIEW 0.60 0.55 0.50 BOTTOM VIEW 0.05 MAX 0.02 NOM COPLANARITY 0.05 0.50 BSC 0.20 REF 081308-D SEATING PLANE 4 Figure 64. 10-Lead Lead Frame Chip Scale Package [LFCSP_UQ] 2 mm × 2 mm Body, Ultra Thin Quad (CP-10-11) Dimensions shown in millimeters 0.30 0.25 0.18 2.00 BSC SQ 0.65 0.60 0.55 PIN 1 INDEX AREA 0.
PAGE 19
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 5.00 (0.1968) 4.80 (0.1890) 8 5 1 4 6.20 (0.2441) 5.80 (0.2284) 1.27 (0.0500) BSC 1.75 (0.0688) 1.35 (0.0532) 0.25 (0.0098) 0.10 (0.0040) 0.51 (0.0201) 0.31 (0.0122) COPLANARITY 0.10 SEATING PLANE 0.50 (0.0196) 0.25 (0.0099) 45° 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.
PAGE 20
ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4 ORDERING GUIDE Model1 ADA4691-2ACBZ-R7 ADA4691-2ACBZ-RL ADA4691-2ACPZ-R7 ADA4691-2ACPZ-RL ADA4691-4ACPZ-R2 ADA4691-4ACPZ-R7 ADA4691-4ACPZ-RL ADA4692-2ACPZ-R7 ADA4692-2ACPZ-RL ADA4692-2ARZ ADA4692-2ARZ-R7 ADA4692-2ARZ-RL ADA4692-4ARUZ ADA4692-4ARUZ-RL 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 −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 −40°C to