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ADA4891-3
Service Manual
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ANALOG DEVICES ADA4891-3 Service Manual

Rail-to-Rail Amplifiers
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4
08054-026
NC
1
–IN
2
+IN
3
–V
S
4
NC
8
+V
S
7
OUT
6
NC
5
ADA4891-1
NC = NO CONNECT
08054-001
OUT
1
+IN
3
–V
S
2
+V
S
5
–IN
4
ADA4891-1
08054-027
ADA4891-2
OUT1
1
–IN1
2
+IN1
3
–V
S
4
+V
S
8
OUT2
7
–IN2
6
+IN2
5
NC = NO CONNECT
PD1
1
OUT2
14
PD2
2
–IN2
13
PD3
3
+IN2
12
+V
S
4
–V
S
11
+IN1
5
+IN3
10
–IN1
6
–IN3
9
OUT1
7
OUT3
8
08054-073
ADA4891-3
+V
S
+IN2
OUT2
OUT4
+IN4 –V
S
+IN3
OUT3
+IN1
OUT1
1 2 3 4 5 6 7
14 13
12 11 10
9 8
–IN1
–IN2
–IN4
–IN3
08054-074
ADA4891-4
Data Sheet

FEATURES

Qualified for automotive applications (ADA4891-1W,
ADA4891-2W 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
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
= 150 Ω)
L
Low Cost CMOS, High Speed,

CONNECTION DIAGRAMS

Figure 1. 8-Lead SOIC_N (R-8)
Figure 2. 5-Lead SOT-23 (RJ-5)
Figure 3. 8-Lead SOIC_N (R-8) and 8-Lead MSOP (RM-8)

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 maxi­mum dynamic range.
The ADA4891 family of amplifiers is ideal for imaging applica­tions, 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 avail­able 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
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
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Figure 4. 14-Lead SOIC_N (R-14) and 14-Lead TSSOP (RU-14)
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Connection Diagrams ...................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
5 V Operation ............................................................................... 3
3 V Operation ............................................................................... 4
Absolute Maximum Ratings ............................................................ 6
Maximum Power Dissipation ..................................................... 6
ESD Caution .................................................................................. 6
Typical Performance Characteristics ............................................. 7
Applications Information .............................................................. 15
Using the ADA4891 ................................................................... 15
Wideband, Noninverting Gain Operation .............................. 15
Wideband, Inverting Gain Operation ..................................... 15
Recommended Values ................................................................ 15
Effect of RF on 0.1 dB Gain Flatness ........................................ 16
Driving Capacitive Loads .......................................................... 17
Terminating Unused Amplifiers .............................................. 18
Disable Feature (ADA4891-3 Only) ........................................ 18
Single-Supply Operation ........................................................... 18
Video Reconstruction Filter ...................................................... 19
Multiplexer .................................................................................. 19
Layout, Grounding, and Bypassing .............................................. 20
Power Supply Bypassing ............................................................ 20
Grounding ................................................................................... 20
Input and Output Capacitance ................................................. 20
Input-to-Output Coupling ........................................................ 20
Leakage Currents ........................................................................ 20
Outline Dimensions ....................................................................... 21
Ordering Guide .......................................................................... 23
Automotive Products ................................................................. 23

REVISION HISTORY

3/12—Rev. C t o R e v. D
Added ADA4891-1W and ADA4891-2W ...................... Universal
Changes to Features Section and Applications Section ............... 1
Changes to Input Offset Voltage, Input Bias Current, and Open-
Loop Gain Parameters, Table 1 ....................................................... 4
Changes to Input Offset Voltage, Input Bias Current, and Open-
Loop Gain Parameters, Table 2 ....................................................... 5
Changes to Ordering Guide .......................................................... 23
Added Automotive Products Section .......................................... 23
9/10—Rev. B t o R e v. C
Changes to Figure 23 and Figure 24 ............................................... 9
7/10—Rev. A to Rev. B
Added ADA4891-3 and ADA4891-4 ............................... Universal
Added 14-Lead SOIC and 14-Lead TSSOP Packages .... Universal
Deleted Figure 4; Renumbered Figures Sequentially ................... 1
Changes to Features Section and General Description Section . 1
Added Figure 4 and Figure 5 ........................................................... 1
Changes to Table 1 ............................................................................ 3
Changes to Table 2 ............................................................................ 4
Changes to Maximum Power Dissipation Section
and Figure 6 ....................................................................................... 6
Added Table 4; Renumbered Tables Sequentially ......................... 6
Deleted Figure 11 ............................................................................... 6
Changes to Typical Performance Characteristics Section ........... 7
Deleted Figure 12 ............................................................................... 7
Changes to Wideband, Noninverting Gain Operation Section,
Wideband, Inverting Gain Operation Section, and Table 5 ..... 15
Added Table 6 ................................................................................. 16
Changes to Figure 52 ...................................................................... 16
Added Figure 53 ............................................................................. 16
Changed Layout of Driving Capacitive Loads Section .............. 17
Added Disable Feature (ADA4891-3 Only) Section
and Single-Supply Operation Section .......................................... 18
Added Multiplexer Section ........................................................... 19
Updated Outline Dimensions ....................................................... 21
Changes to Ordering Guide .......................................................... 23
6/10—Rev. 0 to R e v. A
Changes to Figure 26 ......................................................................... 9
Changes to Figure 33 and Figure 34............................................. 10
Updated Outline Dimensions ....................................................... 18
Changes to Ordering Guide .......................................................... 18
2/10—Revision 0: Initial Version
Rev. D | Page 2 of 24
Data Sheet ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4
Bandwidth for 0.1 dB Gain Flatness
25 MHz
Harmonic Distortion, HD2/HD3
fC = 1 MHz, VO = 2 V p-p, G = +1
−79/−93
dBc
ADA4891-1W/ADA4891-2W only, T
to T
,
66
dB
INPUT CHARACTERISTICS
RL = 150 Ω to 2.5 V
0.08 to 4.90
V

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, R unless otherwise noted.
Table 1.
Parameter Test Conditions/Comments Min Typ Max Unit
DYNAMIC PERFORMANCE
−3 dB Small-Signal Bandwidth ADA4891-1/ADA4891-2, G = +1, VO = 0.2 V p-p 240 MHz
ADA4891-3/ADA4891-4, G = +1, VO = 0.2 V p-p 220 MHz
ADA4891-1/ADA4891-2, G = +2, V
= 150 Ω to 2.5 V
R
L
ADA4891-3/ADA4891-4, G = +2, V R
= 150 Ω to 2.5 V
L
ADA4891-1/ADA4891-2, G = +2, VO = 2 V p-p,
= 150 Ω to 2.5 V, RF = 604 Ω
R
L
ADA4891-3/ADA4891-4, G = +2, V
= 150 Ω to 2.5 V, RF = 374 Ω
R
L
Slew Rate, tR/tF G = +2, VO = 2 V step, 10% to 90% 170/210 V/µs
−3 dB Large-Signal Frequency Response G = +2, VO = 2 V p-p, RL = 150 Ω 40 MHz
Settling Time to 0.1% G = +2, VO = 2 V step 28 ns
NOISE/DISTORTION PERFORMANCE
= 604 Ω; for the ADA4891-3 and ADA4891-4, RF = 453 Ω,
F
= 0.2 V p-p,
O
= 0.2 V p-p,
O
= 2 V p-p,
O
90 MHz
96 MHz
25 MHz
fC = 1 MHz, VO = 2 V p-p, G = −1 −75/−91 dBc
Input Voltage Noise f = 1 MHz 9 nV/√Hz
Differential Gain Error (NTSC) G = +2, RL = 150 Ω to 2.5 V 0.05 %
Differential Phase Error (NTSC) G = +2, RL = 150 Ω to 2.5 V 0.25 Degrees
All-Hostile Crosstalk f = 5 MHz, G = +2, VO = 2 V p-p −80 dB
DC PERFORMANCE
Input Offset Voltage ±2.5 ±10 mV
ADA4891-1W/ADA4891-2W only, T
T
MIN
to T
±3.1 mV
MAX
MIN
to T
±3.1 ±16 mV
MAX
Offset Drift 6 µV/°C
Input Bias Current −50 +2 +50 pA
ADA4891-1W/ADA4891-2W only, T
MIN
to T
−50 +50 nA
MAX
Open-Loop Gain RL = 1 kΩ to 2.5 V 77 83 dB
MIN
MAX
RL = 1 kΩ to 2.5 V
RL = 150 Ω to 2.5 V 71 dB
Input Resistance 5 GΩ
Input Capacitance 3.2 pF
Input Common-Mode Voltage Range
−V +V
S
S
− 0.3 to
− 0.8
V
Common-Mode Rejection Ratio (CMRR) VCM = 0 V to 3.0 V 88 dB
OUTPUT CHARACTERISTICS
Output Voltage Swing RL = 1 kΩ to 2.5 V 0.01 to 4.98 V
Output Current 1% THD with 1 MHz, VO = 2 V p-p 125 mA
Short-Circuit Current
Sourcing 205 mA Sinking 307 mA
Rev. D | Page 3 of 24
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 Data Sheet
POWER SUPPLY
Negative PSRR
+VS = 5 V, −VS = −0.25 V to 0 V
63 dB
DYNAMIC PERFORMANCE
Slew Rate, tR/tF
G = +2, VO = 2 V step, 10% to 90%
140/230
V/µs
NOISE/DISTORTION PERFORMANCE
Parameter Test Conditions/Comments Min Typ Max Unit
POWER-DOWN PINS (PD1, PD2, PD3)
Threshold Voltage, VTH 2.4 V Bias Current Part enabled 65 nA Part powered down −22 µA Turn-On Time Part enabled, output rises to 90% of final value 166 ns Turn-Off Time
Operating Range 2.7 5.5 V Quiescent Current per Amplifier 4.4 mA Supply Current When Powered Down ADA4891-3 only 0.8 mA Power Supply Rejection Ratio (PSRR)
Positive PSRR +VS = 5 V to 5.25 V, −VS = 0 V 65 dB
OPERATING TEMPERATURE RANGE −40 +125 °C

3 V OPERATION

TA = 25°C, VS = 3 V, RL = 1 kΩ to 1. 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, R unless otherwise noted.
ADA4891-3 only
Part powered down, output falls to 10% of final
49 ns
value
= 604 Ω; for the ADA4891-3 and ADA4891-4, RF = 453 Ω,
F
Table 2.
Parameter Test Conditions/Comments Min Typ Max Unit
−3 dB Small-Signal Bandwidth ADA4891-1/ADA4891-2, G = +1, VO = 0.2 V p-p 190 MHz ADA4891-3/ADA4891-4, G = +1, VO = 0.2 V p-p 175 MHz
Bandwidth for 0.1 dB Gain Flatness
ADA4891-1/ADA4891-2, G = +2, V R
= 150 Ω to 1.5 V
L
ADA4891-3/ADA4891-4, G = +2, V
= 150 Ω to 1.5 V
R
L
ADA4891-1/ADA4891-2, G = +2, V
= 150 Ω to 1.5 V, RF = 604 Ω
R
L
ADA4891-3/ADA4891-4, G = +2, V R
= 150 Ω to 1.5 V, RF = 374 Ω
L
= 0.2 V p-p,
O
= 0.2 V p-p,
O
= 2 V p-p,
O
= 2 V p-p,
O
75 MHz
80 MHz
18 MHz
18 MHz
−3 dB Large-Signal Frequency Response G = +2, VO = 2 V p-p, RL = 150 Ω 40 MHz Settling Time to 0.1% G = +2, VO = 2 V step 30 ns
Harmonic Distortion, HD2/HD3 fC = 1 MHz, VO = 2 V p-p, G = −1 −70/−89 dBc Input Voltage Noise f = 1 MHz 9 nV/√Hz Differential Gain Error (NTSC) G = +2, RL = 150 Ω to 0.5 V, +VS = 2 V, −VS = −1 V 0.23 % Differential Phase Error (NTSC) G = +2, RL = 150 Ω to 0.5 V, +VS = 2 V, −VS = −1 V 0.77 Degrees All-Hostile Crosstalk f = 5 MHz, G = +2 −80 dB
DC PERFORMANCE
Input Offset Voltage ±2.5 ±10 mV ADA4891-1W/ADA4891-2W only, T T
MIN
to T
±3.1 mV
MAX
MIN
to T
±3.1 ±16 mV
MAX
Offset Drift 6 µV/°C Input Bias Current −50 +2 +50 pA ADA4891-1W/ADA4891-2W only, T
MIN
to T
−50 +50 nA
MAX
Rev. D | Page 4 of 24
Data Sheet ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4
Input Common-Mode Voltage Range
−VS − 0.3 to
V
OUTPUT CHARACTERISTICS
Threshold Voltage, VTH
1.3 V
Supply Current When Powered Down
ADA4891-3 only
0.73 mA
Parameter Test Conditions/Comments Min Typ Max Unit
Open-Loop Gain RL = 1 kΩ to 1.5 V 72 76 dB
ADA4891-1W/ADA4891-2W only, T
= 1 kΩ to 1.5 V
R
L
MIN
to T
MAX
RL = 150 Ω to 1.5 V 65 dB
INPUT CHARACTERISTICS
Input Resistance 5 GΩ
Input Capacitance 3.2 pF
Common-Mode Rejection Ratio (CMRR) VCM = 0 V to 1.5 V 87 dB
Output Voltage Swing RL = 1 kΩ to 1.5 V 0.01 to 2.98 V
RL = 150 Ω to 1.5 V 0.07 to 2.87 V
Output Current 1% THD with 1 MHz, VO = 2 V p-p 37 mA
Short-Circuit Current
Sourcing 80 mA Sinking 163 mA
POWER-DOWN PINS (PD1, PD2, PD3)
ADA4891-3 only
Bias Current Part enabled 48 nA
Part powered down −13 µA
Turn-On Time Part enabled, output rises to 90% of final value 185 ns
Turn-Off Time
Part powered down, output falls to 10% of final value
POWER SUPPLY
Operating Range 2.7 5.5 V
Quiescent Current per Amplifier 3.5 mA
60 dB
,
+VS − 0.8
58 ns
Power Supply Rejection Ratio (PSRR)
Positive PSRR +VS = 3 V to 3.15 V, −VS = 0 V 76 dB Negative PSRR +VS = 3 V, −VS = −0.15 V to 0 V 72 dB
OPERATING TEMPERATURE RANGE −40 +125 °C
Rev. D | Page 5 of 24
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 Data Sheet
Input Voltage (Common Mode)
−VS − 0.5 V to +VS
0
0.5
1.0
2.0
1.5
–55 –35 –15 5 25 45 65 85 105 125
AMBIENT TEMPERATURE (°C)
MAXIMUM POWER DISSIPATION (W)
14-LEAD TSS OP
8-LEAD SOIC_N
14-LEAD SOIC_N
5-LEAD SOT-23
8-LEAD MSOP
T
J
= 150°C
08054-002
8-Lead MSOP
133
°C/W

ABSOLUTE MAXIMUM RATINGS

Table 3.
Parameter Rating
Supply Voltage 6 V
Differential Input Voltage ±VS Storage Temperature Range −65°C to +125°C Operating Temperature Range −40°C to +125°C Lead Temperature (Soldering, 10 sec) 300°C
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.

MAXIMUM POWER DISSIPATION

The maximum power that can be safely dissipated by the ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 is limited by the associated rise in junction temperature. The maximum safe junction temperature for plastic encapsulated devices is determined by the glass transition temperature of the plastic, approximately 150°C. Temporarily exceeding this limit can cause a shift in parametric performance due to a change in the stresses exerted on the die by the package. Exceeding a junction temperature of 175°C for an extended period can result in device failure.
The still-air thermal properties of the package (θ temperature (T (P
) can be used to determine the junction temperature of the die.
D
), and the total power dissipated in the package
A
The junction temperature can be calculated as
= TA + (PD × θJA) (1)
T
J
The power dissipated in the package (P
) is the sum of the
D
quiescent power dissipation and the power dissipated in the package due to the load drive for all outputs. It can be calculated by
P
= (VT × IS) + (VS − V
D
OUT
) × (V
OUT/RL
where:
is the total supply rail.
V
T
I
is the quiescent current.
S
is the positive supply rail.
V
S
V
is the output of the amplifier.
OUT
is the output load of the amplifier.
R
L
JA
) (2)
), the ambient
To ensure proper operation, it is necessary to observe the maxi­mum power derating curves shown in Figure 6. These curves are derived by setting T
= 150°C in Equation 1. Figure 6 shows
J
the maximum safe power dissipation in the package vs. the ambient temperature on a JEDEC standard 4-layer board.
Figure 6. Maximum Power Dissipation vs. Ambient Temperature
Tabl e 4 lists the thermal resistance (θJA) for each ADA4891-1/ ADA4891-2/ADA4891-3/ADA4891-4 package.
Table 4.
Package Type θJA Unit
5-Lead SOT-23 146 °C/W 8-Lead SOIC_N 115 °C/W
14-Lead SOIC_N 162 °C/W 14-Lead TSSOP 108 °C/W

ESD CAUTION

Rev. D | Page 6 of 24
Data Sheet ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4
–10
–9
–8
–7
–6
–5
–4
–3
–2
–1
0
1
2
3
4
0.1 1 10 100 1k
NORMALIZED CLOSED-LOOP GAIN (dB)
FREQUENCY (MHz)
VS = 5V V
OUT
= 200mV p-p
R
F
= 604Ω
R
L
= 1kΩ
G = +10
G = +5
G = –1 OR +2
G = +1
08054-028
–15
–12
–9
–6
–3
0
3
6
0.1 1 10 100 1k
CLOSED-LOOP GAIN (dB)
FREQUENCY (MHz)
G = +1 V
OUT
= 200mV p-p
RL = 1kΩ
VS = 2.7V
VS = 5V
08054-029
V
S
= 3V
–4
–3
–2
–1
0
1
2
3
4
5
0.1 1 10 100 1k
CLOSED-LOOP GAIN (dB)
FREQUENCY (MHz)
VS = 5V G = +1 V
OUT
= 200mV p-p
RL = 1kΩ
08054-030
+125°C
+85°C
+25°C
0°C
–40°C
5 4 3 2 1
0 –1 –2 –3 –4 –5 –6 –7 –8 –9
–10
0.1 1 10 100 1k FREQUENCY (MHz)
NORMALIZED CLOSED-LOOP GAIN (dB)
08054-076
G = +10
G = +5
G = +1
G = –1 OR +2
VS = 5V V
OUT
= 200mV p-p
R
F
= 453Ω
R
L
= 1kΩ
6
3
0
–3
–6
–9
–12
–15
0.1 1 10 100 1k FREQUENCY (MHz)
CLOSED-LOOP GAIN (dB)
08054-077
V
S
= 2.7V
G = +1 V
OUT
= 200mV p-p
R
L
= 1kΩ
V
S
= 3V
V
S
= 5V
–4
–3
–2
–1
0
1
2
3
4
5
0.1 1 10 100 1k FREQUENCY (MHz)
CLOSED-LOOP GAIN (dB)
08054-078
VS = 5V G = +1 V
OUT
= 200mV p-p
RL = 1kΩ
+125°C
+85°C
+25°C
0°C
–40°C

TYPICAL PERFORMANCE CHARACTERISTICS

Unless otherwise noted, all plots are characterized for the ADA4891-1, ADA4891-2, ADA4891-3, and ADA4891-4. For the ADA4891-1 and ADA4891-2, the typical R
Figure 7. Small-Signal Frequency Response vs. Gain, VS = 5 V,
ADA4891-1/ADA4891-2
value is 604 Ω. For the ADA4891-3 and ADA4891-4, the typical RF value is 453 Ω.
F
Figure 10. Small-Signal Frequency Response vs. Gain, V
ADA4891-3/ADA4891-4
= 5 V,
S
Figure 8. Small-Signal Frequency Response vs. Supply Voltage,
ADA4891-1/ADA4891-2
Figure 9. Small-Signal Frequency Response vs. Temperature, VS = 5 V,
ADA4891-1/ADA4891-2
Figure 11. Small-Signal Frequency Response vs. Supply Voltage,
ADA4891-3/ADA4891-4
Figure 12. Small-Signal Frequency Response vs. Temperature, V
= 5 V,
S
ADA4891-3/ADA4891-4
Rev. D | Page 7 of 24
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 Data Sheet
CLOSED-LOOP GAIN (dB)
FREQUENCY (MHz)
–6
–5
–4
–3
–2
–1
0
3
4
5
6
1
2
7
0.1 1 10 100 1k
+125°C
+25°C
0°C
–40°C
VS = 3V G = +1 V
OUT
= 200mV p-p
RL = 1kΩ
08054-031
+85°C
–0.5
–0.4
–0.3
–0.2
–0.1
0
0.1
10.1 10 100
FREQUENCY (MHz)
NORMALIZED CLOSED-LOOP GAIN (dB)
G = +2 R
F
= 604Ω
RL = 150Ω
V
S
= 3V
V
OUT
= 2V p-p
VS = 5V
V
OUT
= 1.4V p-p
V
S
= 3V
V
OUT
= 1.4V p-p
08054-019
VS = 5V
V
OUT
= 2V p-p
–10
–9
–8
–7
–6
–5
–4
–3
–2
–1
0
1
0.1 1 10 100 1k
NORMALIZED CLOSED-LOOP GAIN (dB)
FREQUENCY (MHz)
VS = 5V R
L
= 150Ω
V
OUT
= 2V p-p
G = +1
R
F
= 0Ω
G = –1
RF = 604Ω
G = +2
R
F
= 604Ω
G = +5
R
F
= 604Ω
08054-036
CLOSED-LOOP GAIN (dB)
FREQUENCY (MHz)
–6
–5
–4
–3
–2
–1
0
3
4
5
6
1
2
7
0.1 1 10 100 1k
VS = 3V G = +1 V
OUT
= 200mV p-p
R
L
= 1kΩ
08054-079
+125°C
+85°C
+25°C
0°C
–40°C
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0.1 1 10 100 FREQUENCY (MHz)
NORMALIZED CLOSED-LOOP GAIN (dB)
08054-080
VS = 3V V
OUT
= 1.4V p-p
V
S
= 3V
V
OUT
= 2V p-p
V
S
= 5V
V
OUT
= 2V p-p
G = +2 R
F
= 374Ω
R
L
= 150Ω
V
S
= 5V
V
OUT
= 1.4V p-p
1
0 –1 –2 –3 –4 –5 –6 –7 –8 –9
–10
0.1 1 10 100 1k FREQUENCY (MHz)
NORMALIZED CLOSED-LOOP GAIN (dB)
08054-081
VS = 5V R
L
= 150Ω
V
OUT
= 2V p-p
G = +1 R
F
= 0Ω
G = –1 R
F
= 453Ω
G = +5 R
F
= 453Ω
G = +2 R
F
= 453Ω
Figure 13. Small-Signal Frequency Response vs. Temperature, V
ADA4891-1/ADA4891-2
Figure 14. 0.1 dB Gain Flatness vs. Supply Voltage, G = +2,
ADA4891-1/ADA4891-2
= 3 V,
S
Figure 16. Small-Signal Frequency Response vs. Temperature, V
= 3 V,
S
ADA4891-3/ADA4891-4
Figure 17. 0.1 dB Gain Flatness vs. Supply Voltage, G = +2,
ADA4891-3/ADA4891-4
Figure 15. Large-Signal Frequency Response vs. Gain, VS = 5 V,
ADA4891-1/ADA4891-2
Figure 18. Large-Signal Frequency Response vs. Gain, V
= 5 V,
S
ADA4891-3/ADA4891-4
Rev. D | Page 8 of 24
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