Datasheet

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Low Cost CMOS, High Speed,

Rail-to-Rail Amplifiers

Data Sheet

ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4

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FEATURES

Qualified for automotive applications (ADA4891-1W,

ADA4891-2W, and ADA4891-4W only)

High speed and fast settling

−3 dB bandwidth: 220 MHz (G = +1)

Slew rate: 170 V/µs

Settling time to 0.1%: 28 ns

Video specifications (G = +2, R

= 150 Ω)

0.1 dB gain flatness: 25 MHz

Differential gain error: 0.05%

Differential phase error: 0.25°

Single-supply operation

Wide supply range: 2.7 V to 5.5 V

Output swings to within 50 mV of supply rails

Low distortion: 79 dBc SFDR at 1 MHz

Linear output current: 125 mA at −40 dBc

Low power: 4.4 mA per amplifier

APPLICATIONS

Automotive infotainment systems

Automotive driver assistance systems

Imaging

Consumer video

Active filters

Coaxial cable drivers

Clock buffers

Photodiode preamp

Contact image sensor and buffers

GENERAL DESCRIPTION

The ADA4891-1 (single), ADA4891-2 (dual), ADA4891-3 (triple),

and ADA4891-4 (quad) are CMOS, high speed amplifiers that

offer high performance at a low cost. The amplifiers feature true

single-supply capability, with an input voltage range that extends

300 mV below the negative rail.

In spite of their low cost, the ADA4891 family provides high

performance and versatility. The rail-to-rail output stage enables

the output to swing to within 50 mV of each rail, enabling maxi-

mum dynamic range.

The ADA4891 family of amplifiers is ideal for imaging applica-

tions, such as consumer video, CCD buffers, and contact image

sensor and buffers. Low distortion and fast settling time also

make them ideal for active filter applications.

The ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 are avail-

able in a wide variety of packages. The ADA4891-1 is available

in 8-lead SOIC and 5-lead SOT-23 packages. The ADA4891-2

is available in 8-lead SOIC and 8-lead MSOP packages. The

ADA4891-3 and ADA4891-4 are available in 14-lead SOIC and

CONNECTION DIAGRAMS

08054-026

–IN

+IN

–V

OUT

ADA4891-1

NC = NO CONNECT

Figure 1. 8-Lead SOIC_N (R-8)

08054-001

OUT

+IN

–V

–IN

ADA4891-1

Figure 2. 5-Lead SOT-23 (RJ-5)

08054-027

ADA4891-2

OUT1

–IN1

+IN1

–V

OUT2

–IN2

+IN2

NC = NO CONNECT

Figure 3. 8-Lead SOIC_N (R-8) and 8-Lead MSOP (RM-8)

PD1

OUT2

PD2

–IN2

PD3

+IN2

–V

+IN1

+IN3

–IN1

–IN3

OUT1

OUT3

08054-073

ADA4891-3

Figure 4. 14-Lead SOIC_N (R-14) and 14-Lead TSSOP (RU-14)

+IN2

OUT2

OUT4

+IN4

–V

+IN3

OUT3

+IN1

OUT1

–IN1

–IN2

–IN4

–IN3

08054-074

ADA4891-4

Figure 5. 14-Lead SOIC_N (R-14) and 14-Lead TSSOP (RU-14)

14-lead TSSOP packages. The amplifiers are specified to operate

over the extended temperature range of −40°C to +125°C.

Summary of content (24 pages)

PAGE 1
Low Cost CMOS, High Speed, Rail-to-Rail Amplifiers ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 CONNECTION DIAGRAMS APPLICATIONS Automotive infotainment systems Automotive driver assistance systems Imaging Consumer video Active filters Coaxial cable drivers Clock buffers Photodiode preamp Contact image sensor and buffers NC 7 +VS +IN 3 6 OUT –VS 4 5 NC 08054-026 8 –IN 2 NC = NO CONNECT Figure 1. 8-Lead SOIC_N (R-8) ADA4891-1 OUT 1 5 +VS 4 –IN –VS 2 +IN 3 Figure 2.
PAGE 2
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Effect of RF on 0.1 dB Gain Flatness ........................................ 16 Applications ....................................................................................... 1 Driving Capacitive Loads .......................................................... 17 General Description ........................................
PAGE 3
Data Sheet ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 SPECIFICATIONS 5 V OPERATION TA = 25°C, VS = 5 V, RL = 1 kΩ to 2.5 V, unless otherwise noted. All specifications are for the ADA4891-1, ADA4891-2, ADA4891-3, and ADA4891-4, unless otherwise noted. For the ADA4891-1 and ADA4891-2, RF = 604 Ω; for the ADA4891-3 and ADA4891-4, RF = 453 Ω, unless otherwise noted. Table 1. Parameter DYNAMIC PERFORMANCE −3 dB Small-Signal Bandwidth Bandwidth for 0.
PAGE 4
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 Parameter Short-Circuit Current Sourcing Sinking POWER-DOWN PINS (PD1, PD2, PD3) Threshold Voltage, VTH Bias Current Turn-On Time Turn-Off Time POWER SUPPLY Operating Range Quiescent Current per Amplifier Supply Current When Powered Down Power Supply Rejection Ratio (PSRR) Positive PSRR Negative PSRR OPERATING TEMPERATURE RANGE Test Conditions/Comments Data Sheet Min Typ Max Unit 205 307 mA mA 2.
PAGE 5
Data Sheet Parameter Input Bias Current Open-Loop Gain ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 Test Conditions/Comments Min −50 −50 Typ +2 72 60 76 dB dB 65 dB GΩ pF V VCM = 0 V to 1.5 V 5 3.2 −VS − 0.3 to +VS − 0.8 87 dB RL = 1 kΩ to 1.5 V RL = 150 Ω to 1.5 V 1% THD with 1 MHz, VO = 2 V p-p 0.01 to 2.98 0.07 to 2.87 37 V V mA 80 163 mA mA 1.3 48 −13 185 58 V nA µA ns ns ADA4891-1W/ADA4891-2W/ADA4891-4W only, TMIN to TMAX RL = 1 kΩ to 1.
PAGE 6
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 Data Sheet ABSOLUTE MAXIMUM RATINGS To ensure proper operation, it is necessary to observe the maximum power derating curves shown in Figure 6. These curves are derived by setting TJ = 150°C in Equation 1. Figure 6 shows the maximum safe power dissipation in the package vs. the ambient temperature on a JEDEC standard 4-layer board. Table 3. Rating 6V −VS − 0.5 V to +VS ±VS −65°C to +125°C −40°C to +125°C 300°C 2.
PAGE 7
Data Sheet ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 TYPICAL PERFORMANCE CHARACTERISTICS 5 3 4 2 1 0 G = +1 –2 –3 –4 G = +10 G = +5 –5 –6 –7 VS = 5V –8 VOUT = 200mV p-p RF = 604Ω –9 RL = 1kΩ –10 1 0.1 1k 100 10 6 –3 –4 G = +5 –5 –6 –7 VS = 5V VOUT = 200mV p-p RF = 453Ω RL = 1kΩ –8 VS = 2.7V 1 G = +10 10 FREQUENCY (MHz) 6 VS = 3V VS = 2.
PAGE 8
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 Data Sheet 7 7 5 0°C CLOSED-LOOP GAIN (dB) +125°C 4 3 2 1 0 –40°C –1 –2 –3 –6 0.1 1 0 –1 –2 –3 –5 10 1 1k 100 –6 0.1 VS = 3V G = +1 VOUT = 200mV p-p RL = 1kΩ 1 100 1k Figure 16. Small-Signal Frequency Response vs. Temperature, VS = 3 V, ADA4891-3/ADA4891-4 0.1 NORMALIZED CLOSED-LOOP GAIN (dB) 0.1 0 VS = 3V VOUT = 2V p-p –0.1 VS = 5V VOUT = 1.4V p-p –0.2 VS = 5V VOUT = 2V p-p –0.3 G = +2 RF = 604Ω RL = 150Ω 08054-019 VS = 3V VOUT = 1.
PAGE 9
Data Sheet ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 1 G = –1 VOUT = 2V p-p –2 G = +1 VOUT = 1V p-p –4 –5 G = +5 VOUT = 2V p-p –6 –7 VS = 3V RF = 604Ω RL = 150Ω –8 –9 –10 0.1 1 10 FREQUENCY (MHz) 100 1k –2 G = +1 VOUT = 1V p-p –3 –4 G = +5 VOUT = 2V p-p –5 –6 –7 VS = 3V RF = 453Ω RL = 150Ω –8 –9 –10 0.1 1 1k Figure 22. Large-Signal Frequency Response vs.
PAGE 10
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 G = +2 RF = 604Ω RL = 150Ω fC = 1MHz –50 1k VS = 3V SECOND HARMONIC VS = 3V THIRD HARMONIC VOLTAGE NOISE (nV/ Hz) –40 –60 DISTORTION (dBc) Data Sheet –70 VS = 5V SECOND HARMONIC –80 VS = 5V THIRD HARMONIC 100 10 –90 2.0 2.5 3.0 3.5 4.0 4.5 5.0 OUTPUT VOLTAGE (V p-p) 100 80 GAIN –18 40 –90 30 –108 20 –126 10 –144 0 –162 –10 0.001 0.01 0.1 1 10 100 –180 1k FREQUENCY (MHz) 0.02 0 –0.02 –0.04 –0.
PAGE 11
Data Sheet 100 ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 100k VS = 5V G = +1 10k OUTPUT IMPEDANCE (Ω) OUTPUT IMPEDANCE (Ω) 10 1 0.1 1k 100 10 0.1 1 10 100 FREQUENCY (MHz) 1 0.01 08054-046 0.01 0.01 1 10 100 FREQUENCY (MHz) Figure 31. Closed-Loop Output Impedance vs. Frequency, Part Enabled VS = 3V 0.1 08054-089 VS = 5V G = +1 Figure 34. Closed-Loop Output Impedance vs. Frequency, Part Disabled (ADA4891-3 Only) 1.
PAGE 12
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 Data Sheet 200 0.30 VS = 5V G = +2 RL = 150Ω VOUT = 2V p-p 0.20 190 FALLING EDGE SLEW RATE (V/µs) 0 –0.10 –0.20 180 170 160 RISING EDGE 30 35 40 45 TIME (ns) 140 1.0 1.5 1 OUTPUT 1 5ns/DIV 08054-071 1V/DIV OUTPUT INPUT 2 AMPLITUDE (V) 1 INPUT 0 –1 –2 5ns/DIV –3 5ns/DIV VS = ±2.5V G = –2 RL = 1kΩ 1 0 –1 –2 1V/DIV 1V/DIV 3 08054-070 AMPLITUDE (V) 2 5.0 Figure 41. Input Overdrive Recovery from Negative Rail VS = ±2.
PAGE 13
Data Sheet ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 –10 0 VS = 5V –10 –20 –20 VS = 5V G = +2 RL = 150Ω –30 ISOLATION (dB) CMRR (dB) –30 –40 –50 –60 TSSOP –40 –50 –60 SOIC –70 –70 –80 –80 1 10 100 FREQUENCY (MHz) 08054-090 0.1 –100 0.1 1k 1.0 Vs = 5V G = +1 OUTPUT SATURATION VOLTAGE (V) –20 –30 PSRR (dB) 100 Figure 46. Forward Isolation vs. Frequency (ADA4891-3 Only) Figure 43. CMRR vs. Frequency –10 10 FREQUENCY (MHz) 1 08054-084 –90 –90 0.
PAGE 14
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 4.2 4.0 3.8 3.6 3.4 3.2 3.0 2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 SUPPLY VOLTAGE (V) 08054-058 QUIESCENT SUPPLY CURRENT (mA) 4.4 Figure 49. Supply Current per Amplifier vs. Supply Voltage Rev.
PAGE 15
Data Sheet ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 APPLICATIONS INFORMATION WIDEBAND, INVERTING GAIN OPERATION USING THE ADA4891 +VS Understanding the subtleties of the ADA4891 family of amplifiers provides insight into how to extract the peak performance from the device. The following sections describe the effect of gain, component values, and parasitics on the performance of the ADA4891.
PAGE 16
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 Data Sheet Table 6. Recommended Component Values and Effect of Gain on ADA4891-3/ADA4891-4 Performance (RL = 1 kΩ) −3 dB Small-Signal Bandwidth (MHz) VOUT = 200 mV p-p 97 220 97 31 13 EFFECT OF RF ON 0.1 dB GAIN FLATNESS Figure 52 and Figure 53 show the effect of using various values for Feedback Resistor RF on the 0.1 dB gain flatness of the parts. Figure 52 shows the effect for the ADA4891-1/ADA4891-2. Figure 53 show the effect for the ADA4891-3/ADA4891-4.
PAGE 17
Data Sheet ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 These four methods minimize the output capacitive loading effect. • CF = 0pF 0.1 • CF = 1pF 0 VS = 5V G = +2 RF = 604Ω RL = 150Ω VOUT = 2V p-p –0.3 0.1 10 1 100 FREQUENCY (MHz) • Figure 54. 0.1 dB Gain Flatness vs. CF, VS = 5 V, ADA4891-1/ADA4891-2 DRIVING CAPACITIVE LOADS A highly capacitive load reacts with the output impedance of the amplifiers, causing a loss of phase margin and subsequent peaking or even oscillation.
PAGE 18
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 Data Sheet TERMINATING UNUSED AMPLIFIERS SINGLE-SUPPLY OPERATION Terminating unused amplifiers in a multiamplifier package is an important step in ensuring proper operation of the functional amplifier. Unterminated amplifiers can oscillate and draw excessive power. The recommended procedure for terminating unused amplifiers is to connect any unused amplifiers in a unity-gain configuration and to connect the noninverting input to midsupply voltage.
PAGE 19
Data Sheet ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 VIDEO RECONSTRUCTION FILTER MULTIPLEXER A common application for active filters is at the output of video digital-to-analog converters (DACs)/encoders. The filter, or more appropriately, the video reconstruction filter, is used at the output of a video DAC/encoder to eliminate the multiple images that are created during the sampling process within the DAC.
PAGE 20
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 Data Sheet LAYOUT, GROUNDING, AND BYPASSING POWER SUPPLY BYPASSING INPUT-TO-OUTPUT COUPLING Power supply pins are additional op amp inputs, and care must be taken so that a noise-free, stable dc voltage is applied. The purpose of bypass capacitors is to create a low impedance path from the supply to ground over a range of frequencies, thereby shunting or filtering the majority of the noise to ground.
PAGE 21
Data Sheet ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 5 1 6.20 (0.2441) 5.80 (0.2284) 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) 1.75 (0.0688) 1.35 (0.0532) 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 22
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 Data Sheet 3.20 3.00 2.80 8 3.20 3.00 2.80 5.15 4.90 4.65 5 1 4 PIN 1 IDENTIFIER 0.65 BSC 0.95 0.85 0.75 15° MAX 1.10 MAX 0.80 0.55 0.40 0.23 0.09 6° 0° 0.40 0.25 10-07-2009-B 0.15 0.05 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 70. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters 8.75 (0.3445) 8.55 (0.3366) 4.00 (0.1575) 3.80 (0.1496) 8 14 1 7 6.20 (0.2441) 5.80 (0.2283) 1.27 (0.0500) BSC 0.
PAGE 23
Data Sheet ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 ORDERING GUIDE Model 1, 2 ADA4891-1ARZ ADA4891-1ARZ-RL ADA4891-1ARZ-R7 ADA4891-1ARJZ-R7 ADA4891-1ARJZ-RL ADA4891-1WARJZ-R7 ADA4891-2ARZ ADA4891-2ARZ-RL ADA4891-2ARZ-R7 ADA4891-2ARMZ ADA4891-2ARMZ-RL ADA4891-2ARMZ-R7 ADA4891-2WARMZ-R7 ADA4891-3ARUZ ADA4891-3ARUZ-R7 ADA4891-3ARUZ-RL ADA4891-3ARZ ADA4891-3ARZ-R7 ADA4891-3ARZ-RL ADA4891-4ARUZ ADA4891-4ARUZ-R7 ADA4891-4ARUZ-RL ADA4891-4WARUZ-R7 ADA4891-4ARZ ADA4891-4ARZ-R7 ADA4891-4ARZ-RL ADA4891-1AR-EBZ ADA48
PAGE 24
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 NOTES ©2010–2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D08054-0- /13(E) Rev.