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A-4856

Part # A-4856
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

Single-Supply, High Speed, Fixed G = +2,
Rail-to-Rail Output Video Amplifier
ADA4856-3
Rev. 0
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 ©2008 Analog Devices, Inc. All rights reserved.
FEATURES
Voltage feedback architecture
Rail-to-rail output swing: 0.1 V to 4.9 V
High speed amplifier
−3 dB bandwidth: 225 MHz
0.1 dB flatness at 2 V p-p: 74 MHz
Slew rate: 800 V/μs
Settling time to 0.1% with 2 V step: 5 ns
High input common-mode voltage range
−V
S
− 0.2 V to +V
S
− 1 V
Supply range: 3 V to 5.5 V
Differential gain error: 0.01%
Differential phase error: 0.01°
Low power
7.8 mA/amplifier typical supply current
Power-down feature
Available in 16-lead LFCSP
APPLICATIONS
Professional video
Consumer video
Imaging
Instrumentation
Base stations
Active filters
Buffers
CONNECTION DIAGRAM
1
2+IN2
NC
+IN3
–IN3
OUT3
–V
S
+IN1
–IN1
OUT1
–V
S
PD
NC
3
4
11 OUT2
12
+V
S
10 –IN2
9
5678
16 15 14 13
+V
S
07686-001
NOTES
1. NC = NO CONNECT.
2. EXPOSED PAD CONNECTED TO –V
S
.
ADA4856-3
Figure 1.
GENERAL DESCRIPTION
The ADA4856-3 (triple) is a fixed gain of +2, single-supply, rail-
to-rail output video amplifier. It provides excellent video
performance with 225 MHz, −3 dB bandwidth, 800 V/μs slew rate,
and 74 MHz, 0.1 dB flatness into a 150 Ω load. It has a wide
input common-mode voltage range that extends 0.2 V below
ground and 1 V below the positive rail. In addition, the output
voltage swings within 200 mV of either supply, making this video
amplifier easy to use on single-supply voltages as low as 3.3 V.
The ADA4856-3 offers a typical low power of 7.8 mA per amplifier,
while being capable of delivering up to 52 mA of load current.
It also features a power-down function for power sensitive
applications that reduces the supply current to 1 mA.
The ADA4856-3 is available in a 16-lead LFCSP and is designed
to work over the extended industrial temperature range of
−40°C to +105°C.
7
6
5
4
3
2
1
0
1 10 100 1000
CLOSED-LOOP GAIN (dB)
FREQUENCY (MHz)
07686-058
V
S
= 3.3V, V
OUT
= 2V p-p
V
S
= 5V, V
OUT
= 1.4V p-p
V
S
= 5V, V
OUT
= 2V p-p
R
L
= 150
V
S
= 3.3V, V
OUT
= 1.4V p-p
Figure 2. Large Signal Frequency Response
ADA4856-3
Rev. 0 | Page 2 of 20
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Connection Diagram ....................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
5 V Operation ............................................................................... 3
3.3 V Operation ............................................................................ 4
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance ...................................................................... 5
Maximum Power Dissipation ..................................................... 5
ESD Caution .................................................................................. 5
Pin Configuration and Function Descriptions ............................. 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 12
Applications Information .............................................................. 13
Using the ADA4856-3 in Gains Equal to +1, −1 ........................ 13
Using the ADA4856-3 in Gains Equal to +3, +4, and +5 ..... 14
20 MHz Active Low-Pass Filter ................................................ 15
Video Line Driver ....................................................................... 15
Single-Supply Operation ........................................................... 16
Power Down ................................................................................ 16
Layout Considerations ............................................................... 16
Power Supply Bypassing ............................................................ 16
Outline Dimensions ....................................................................... 17
Ordering Guide .......................................................................... 17
REVISION HISTORY
10/08—Revision 0: Initial Version
ADA4856-3
Rev. 0 | Page 3 of 20
SPECIFICATIONS
5 V OPERATION
T
A
= 25°C, +V
S
= 5 V, −V
S
= 0 V, G = +2, R
L
= 150 Ω to midsupply, unless otherwise noted.
Table 1.
Parameter Test Conditions Min Typ Max Unit
DYNAMIC PERFORMANCE
−3 dB Bandwidth V
O
= 0.1 V p-p 370 MHz
V
O
= 1.4 V p-p 225 MHz
V
O
= 2 V p-p 200 MHz
Bandwidth for 0.1 dB Flatness V
O
= 1.4 V p-p 90 MHz
V
O
= 2 V p-p 74 MHz
Slew Rate V
O
= 2 V step 800 V/μs
Settling Time to 0.1% (Rise/Fall) V
O
= 2 V step 4.8/5.2 ns
NOISE/DISTORTION PERFORMANCE
Harmonic Distortion (HD2/HD3) f
C
= 5 MHz, V
O
= 2 V p-p, R
L
= 1 kΩ −92/−110 dBc
f
C
= 20 MHz, V
O
= 2 V p-p, R
L
= 1 kΩ −68/−71 dBc
Crosstalk, Output to Output f = 5 MHz, G = +2 −80 dBc
Input Voltage Noise f = 100 kHz 14 nV/√Hz
Input Current Noise f = 100 kHz 2 pA/√Hz
Differential Gain Error 0.01 %
Differential Phase Error 0.01 Degrees
DC PERFORMANCE
Input Offset Voltage 1.3 3.4 mV
Input Offset Voltage Drift 5.5 μV/°C
Input Bias Current −3.8 μA
Input Offset Current ±0.05 μA
Closed-Loop Gain 1.95 2 2.05 V/V
Open-Loop Gain 90 dB
INPUT CHARACTERISTICS
Input Resistance 3.2
Input Capacitance 0.5 pF
Input Common-Mode Voltage Range −V
S
− 0.2 +V
S
− 1 V
Common-Mode Rejection Ratio V
CM
= −0.2 V to +4 V 94 dB
OUTPUT CHARACTERISTICS
Output Voltage Swing 0.1 to 4.9 V
Linear Output Current Per Amplifier HD2 ≤ −60 dBc, R
L
= 10 Ω 52 mA
POWER-DOWN
Turn-On Time 78 ns
Turn-Off Time 950 ns
Input Bias Current Enabled 0.2 μA
Powered down −125 μA
Turn-On Voltage 3.75 V
POWER SUPPLY
Operating Range 3 5.5 V
Quiescent Current per Amplifier 7.8 mA
Supply Current When Disabled 1.1 mA
Power Supply Rejection Ratio ∆V
S
= 4.5 V to 5.5 V 96 dB
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