Output Amplifier. AD8264 Datasheet

AD8264 Amplifier. Datasheet pdf. Equivalent

AD8264 Datasheet
Recommendation AD8264 Datasheet
Part AD8264
Description DC Coupled VGA And Differential Output Amplifier
Feature AD8264; Data Sheet Quad, 235 MHz, DC-Coupled VGA and Differential Output Amplifier AD8264 FEATURES GENERA.
Manufacture Analog Devices
Datasheet
Download AD8264 Datasheet





Analog Devices AD8264
Data Sheet
Quad, 235 MHz, DC-Coupled VGA
and Differential Output Amplifier
AD8264
FEATURES
GENERAL DESCRIPTION
Low noise
Voltage noise: 2.3 nV/√Hz
Current noise: 2 pA/√Hz
Wide bandwidth
Small signal: 235 MHz (VGAx); 80 MHz (output amplifier)
Large signal: 80 MHz (1 V p-p)
Gain range
0 to 24 dB (input to VGA output)
6 to 30 dB (input to differential output)
Gain scaling: 20 dB/V
DC-coupled
Single-ended input and differential output
Supplies: ±2.5 V to ±5 V
Low power: 140 mW per channel at ±3.3 V
APPLICATIONS
Multichannel data acquisition
Positron emission tomography
Gain trim
Industrial and medical ultrasound
Radar receivers
The AD8264 is a quad, linear-in-dB, general-purpose, variable
gain amplifier (VGA) with a preamplifier (preamp), and a flexible
differential output buffer. DC coupling, combined with wide
bandwidth, makes this amplifier a very good pulse processor.
Each channel includes a single-ended input preamp/VGA section
to preserve the wide bandwidth and fast slew rate for low dis-
tortion pulse applications. A 6 dB differential output buffer with
common-mode and offset adjustments enable direct coupling to
most modern high speed analog-to-digital converters (ADCs),
using the converter reference output for perfect dc matching levels.
The −3 dB bandwidth of the preamp/VGA is dc to 235 MHz,
and the bandwidth of the differential driver is 80 MHz. The
floating gain control interface provides a precise linear-in-dB scale
of 20 dB/V and is easy to interface to a variety of external circuits.
The gain of each channel is adjusted independently, and all
channels are referenced to a single pin, GNLO. Combined with
a multioutput, digital-to-analog converter (DAC), each section
of the AD8264 can be used for active calibration or as a trim
amplifier.
Operation from a bipolar power supply enables amplification of
negative voltage pulses generated by current-sinking pulses into
a grounded load, such as is typical of photodiodes or photo-
multiplier tubes (PMT). Delay-free processing of wideband
video signals is also possible.
FUNCTIONAL BLOCK DIAGRAM
ONE CHANNEL SHOWN
IPPx
IPNx
VPOS
VNEG
PREAMP
6dB (2×)
OPPx
100
100
BIAS
VGAx
FIXED GAIN VGA
AMPLIFIER
18dB (8×)
+ ATTENUATOR
–24dB TO 0dB
747
DIFFERENTIAL OUTPUT
AMPLIFIER 6dB (2×)
1k2k
INTERPOLATOR
GAIN
INTERFACE
107
2k
1k
VOLx
VOHx
COMM
GNHx GNLO
Figure 1.
VOCM OFSx
Rev. C
Document Feedback
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2009–2018 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com



Analog Devices AD8264
AD8264
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 6
Thermal Resistance ...................................................................... 6
Maximum Power Dissipation ..................................................... 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Test Circuits..................................................................................... 20
Theory of Operation ...................................................................... 28
REVISION HISTORY
10/2018—Rev. B to Rev. C
Deleted Figure 113.......................................................................... 31
Added Figure 113; Renumbered Sequentially ............................ 31
Updated Outline Dimensions ....................................................... 37
1/2016—Rev. A to Rev. B
Changes to Features Section, General Description Section, and
Figure 1 .............................................................................................. 1
Changes to Figure 2.......................................................................... 7
Changes to VGA Section ............................................................... 28
Updated Outline Dimensions ....................................................... 37
Changes to Ordering Guide .......................................................... 37
Data Sheet
Overview ..................................................................................... 28
Preamp......................................................................................... 28
VGA ............................................................................................. 28
Post Amplifier............................................................................. 29
Noise ............................................................................................ 29
Applications Information .............................................................. 30
A Low Channel Count Application Concept Using a Discrete
Reference ..................................................................................... 30
A DC Connected Concept Example........................................ 31
Evaluation Board ............................................................................ 34
Connecting and Using the AD8264-EVALZ .......................... 34
Outline Dimensions ....................................................................... 37
Ordering Guide .......................................................................... 37
1/2011—Rev. 0 to Rev. A
Changes to Figure 1...........................................................................1
Changes to Connecting and Using the AD8264-EVALZ Section
and Figure 117 ................................................................................ 34
Changes to Figure 118 ................................................................... 35
5/2009—Revision 0: Initial Version
Rev. C | Page 2 of 37



Analog Devices AD8264
Data Sheet
AD8264
SPECIFICATIONS
VS = ±2.5 V, TA = 25°C, f = 10 MHz, CL = 5 pF, RL = 500 Ω per output (VGAx, VOHx, VOLx), VGAIN = (VGNHx − VGNLO) = 0 V,
VVOCM = GND, VOFSx = GND, gain range = 6 dB to 30 dB, unless otherwise specified.
Table 1.
Parameter
Test Conditions/Comments
Min Typ
Max
GENERAL PERFORMANCE
–3 dB Small Signal Bandwidth (VGAx)
–3 dB Large Signal Bandwidth (VGAx)
–3 dB Small Signal Bandwidth (Differential Output)1
–3 dB Large Signal Bandwidth (Differential Output)1
Slew Rate
Input Bias Current
VOUT = 10 mV p-p
VOUT = 1 V p-p
VOUT = 100 mV p-p
VOUT = 2 V p-p
VGAx, VOUT = 2 V p-p
VGAx, VOUT = 1 V p-p
Differential output, VOUT = 2 V p-p
Differential output, VOUT = 1 V p-p
Pins IPPx
235
150
80
80
380
290
470
220
−8 −5
−3
Input Resistance
Input Capacitance
Input Impedance
Input Voltage Noise
Input Current Noise
Noise Figure (Differential Output)
Output-Referred Noise (Differential Output)
Output Impedance
Output Signal Range
Output Offset Voltage
DYNAMIC PERFORMANCE
Pins IPPx at dc; ΔVIN/ΔIBIAS
Pins IPPx
Pins IPPx at 10 MHz
VGAIN = 0.7 V, RS = 50 Ω, unterminated
VGAIN = 0.7 V (Gain = 30 dB)
VGAIN = −0.7 V (Gain = 6 dB)
VGAx, dc to 10 MHz
Differential output, dc to 10 MHz
Preamp
VGAx, RL ≥ 500 Ω
Differential amplifier, RL ≥ 500 Ω per side
Preamp offset
VGAx offset, VGAIN = 0.7 V
Differential output offset, VGAIN = 0.7 V
4.2
2
7.9
2.3
2
9
72
45
3.5
<1
|VS| − 1.3
|VS| − 1.3
|VS| − 0.5
−6 |<1|
−18 |<5|
−38 |<10|
+6
+18
+38
Harmonic Distortion
HD2
HD3
HD2
HD3
HD2
HD3
HD2
HD3
VGAx = 1 V p-p, differential output =
2 V p-p (measured at VGAx)
f = 1 MHz
f = 10 MHz
f = 35 MHz
VGAx = 1 V p-p, differential output = 2 V p-p
(measured at differential output)
f = 1 MHz
−73
−68
−71
−61
−60
−53
−78
−66
HD2
HD3
HD2
HD3
Input 1 dB Compression Point
f = 10 MHz
f = 35 MHz
VGAIN = −0.7 V, f = 10 MHz
VGAIN = +0.7 V, f = 10 MHz
−71
−43
−56
−20
7
−9.6
Unit
MHz
MHz
MHz
MHz
V/µs
V/µs
V/µs
V/µs
µA
MΩ
pF
kΩ
nV/√Hz
pA/√Hz
dB
nV/√Hz
nV/√Hz
V
V
V
mV
mV
mV
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBm2
dBm
Rev. C | Page 3 of 37





@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)