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PDF AD8264 Data sheet ( Hoja de datos )
| Número de pieza | AD8264 | |
| Descripción | DC Coupled VGA And Differential Output Amplifier | |
| Fabricantes | Analog Devices | |
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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
100Ω
100Ω
BIAS
VGAx
FIXED GAIN VGA
AMPLIFIER
18dB (8×)
+ ATTENUATOR
– –24dB TO 0dB
747Ω
DIFFERENTIAL OUTPUT
AMPLIFIER 6dB (2×)
1kΩ 2kΩ
INTERPOLATOR
GAIN
INTERFACE
107Ω
2kΩ
1kΩ
VOLx
VOHx
COMM
GNHx GNLO
Figure 1.
VOCM OFSx
Rev. B
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 ©2009–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD8264
Data Sheet
Parameter
Two-Tone Intermodulation Distortion (IMD3)
Output Third-Order Intercept
Overload Recovery
Group Delay Variation
ACCURACY
Absolute Gain Error3
Gain Law Conformance4
Channel-to-Channel Matching
GAIN CONTROL INTERFACE
Gain Scaling Factor
Over Temperature
Gain Range
Gain Intercept to VGAx
Over Temperature
Gain Intercept to Differential Output
Over Temperature
GNHx Input Voltage Range
Input Resistance
GNHx Input Bias Current
Over Temperature
GNLO Input Bias Current
Over Temperature
Response Time
OUTPUT BUFFER
VOCM Input Bias Current
Over Temperature
VOCM Input Voltage Range
Gain (VGAx to Differential Output)
Over Temperature
Test Conditions/Comments
VGAx = 1 V p-p, f1 = 10 MHz, f2 = 11 MHz
VGAx = 1 V p-p, f1 = 35 MHz, f2 = 36 MHz
VOUT = 2 V p-p, f1 = 10 MHz, f2 = 11 MHz
VOUT = 2 V p-p, f1 = 35 MHz, f2 = 36 MHz
VGAx = 1 V p-p, f = 10 MHz
VGAx = 1 V p-p, f = 35 MHz
VOUT = 2 V p-p, f = 10 MHz
VOUT = 2 V p-p, f = 35 MHz
VGAIN = 0.7 V, VIN stepped from 0.1 V p-p to
1 V p-p
1 MHz < f < 100 MHz, full gain range
Min Typ
−68
−51
−49
−34
32
19
23
10
30
17
21
8
25
±1
Max
Unit
dBc
dBc
dBc
dBc
dBm
dBVRMS
dBm
dBVRMS
dBm
dBVRMS
dBm
dBVRMS
ns
ns
−0.7 V < VGAIN < −0.6 V
−0.6 V < VGAIN < −0.5 V
−0.5 V < VGAIN < +0.5 V
0.5 V < VGAIN < 0.6 V
0.6 V < VGAIN < 0.7 V
−0.5 V < VGAIN < +0.5 V, ±2.5 V VS ±5 V
−0.5 V < VGAIN < +0.5 V, −40°C ≤ TA ≤ +105°C
Single IC, −0.5 V < VGAIN < +0.5 V,
−40°C ≤ TA ≤ +105°C
Multiple ICs, −0.5 V < VGAIN < +0.5 V,
−40°C ≤ TA ≤ +105°C
0
−1.25
−1
−1.25
−3
−0.5
0.2 to 2
±0.35
±0.25
±0.35
−0.2 to −2
±0.2
±0.3
±0.1 to ±0.25
±0.25
3
+1.25
+1
+1.25
0
+0.5
dB
dB
dB
dB
dB
dB
dB
dB
dB
−0.5 V < VGAIN < +0.5 V
19.5 20.0
20.5 dB/V
−40°C ≤ TA ≤ +105°C
20 ± 0.5
dB/V
24 dB
11.5 11.9
12.2 dB
−40°C ≤ TA ≤ +105°C
11.9 ± 0.4
dB
17.5 17.9
18.2 dB
−40°C ≤ TA ≤ +105°C
17.9 ± 0.4
dB
GNLO = 0 V, no gain foldover
−VS
+VS V
ΔVIN/ΔIBIAS, −0.7 V < VGAIN < +0.7 V
70 MΩ
−0.7 V < VGAIN < 0.7 V
−0.9 −0.4
0 μA
−0.7 V < VGAIN < 0.7 V, −40°C ≤ TA ≤ +105°C
−0.4 ± +0.2
μA
−0.7 V < VGAIN < 0.7 V
−1.2 μA
−0.7 V < VGAIN < 0.7 V, −40°C ≤ TA ≤ +105°C
−1.2 ± +0.4
μA
24 dB gain change
200 ns
−40°C ≤ TA ≤ +105°C
OFSx = 0 V, VGAx = 0 V
−40°C ≤ TA ≤ +105°C
0.3 1.5
1.5 ± 0.3
−1.4
5.75 6
6 ± 0.5
2.5 nA
nA
+1.4 V
6.25 dB
dB
Rev. B | Page 4 of 40
5 Page 
AD8264
20
PIN = –10dBm
10
0
–10
–20
–30
CCCCLLLL
=
=
=
=
47pF
22pF
9pF
0pF
100k
1M
10M
FREQUENCY (Hz)
100M
500M
Figure 15. Large Signal Frequency Response to VGAx for
Various Capacitive Loads
20
PIN = –28dBm
10
0
–10
–20
–30
100k
CL = 47pF
CCLL
=
=
22pF
10pF
CL = 0pF
1M
10M
FREQUENCY (Hz)
100M
500M
Figure 16. Small Signal Frequency Response to VGAx for
Various Capacitive Loads with Series R = 10 Ω
20
PIN = –8dBm
10
0
–10
–20
–30
CCCCLLLL
=
=
=
=
47pF
22pF
10pF
0pF
100k
1M
10M
FREQUENCY (Hz)
100M
500M
Figure 17. Large Signal Frequency Response to VGAx for
Various Capacitive Loads with Series R = 10 Ω
Data Sheet
30
VOUT = 0.1V p-p
24
VGAIN = +0.7V
18
VGAIN = 0V
12
6
VGAIN = –0.7V
0
–6
–12
–18
100k
VS = ±5V
VS = ±3.3V
VS = ±2.5V
1M
10M
FREQUENCY (Hz)
100M
500M
Figure 18. Small Signal Frequency Response vs. Gain to VGAx for
Various Supply Voltages
40
VOUT = 0.1V p-p
30
VGAIN = +0.7V
20 VGAIN = 0V
10 VGAIN = –0.7V
0
–10
–20
–30
–40
100k
VS = ±5V
VS = ±3.3V
VS = ±2.5V
1M
10M
FREQUENCY (Hz)
100M
500M
Figure 19. Small Signal Frequency Response vs. Gain to Differential Output
for Various Supply Voltages
36
VOUT = 0.1V p-p
VGAIN = 0.7V
30
DIFFERENTIAL
OUTPUT
24 VGA
18
12
6
0
–6
100k
VVVVVVSSSSSS
=
=
=
=
=
=
±5V
±3.3V
±2.5V
±5V
±3.3V
±2.5V
1M
10M
FREQUENCY (Hz)
100M
500M
Figure 20. Large Signal Frequency Response to VGAx and
Differential Output for Various Supply Voltages
Rev. B | Page 10 of 40
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AD8264.PDF ] | |
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