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| 型號： | AD8264-EVALZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 1/40頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD8264 VGA |
| 標準包裝： | 1 |
| 每 IC 通道數(shù)： | 4 - 四 |
| 放大器類型： | 可變增益 |
| 輸出類型： | 差分 |
| 轉(zhuǎn)換速率： | 380 V/µs |
| -3db帶寬： | 235MHz |
| 工作溫度： | -40°C ~ 105°C |
| 電流供應(yīng)（主 IC）： | 99mA |
| 電壓 - 電源，單路/雙路(±)： | ±2.5 V ~ 5 V |
| 板類型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD8264 |
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Quad, 235 MHz, DC-Coupled VGA
and Differential Output Amplifier
AD8264
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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
Fax: 781.461.3113
2009–2011 Analog Devices, Inc. All rights reserved.
FEATURES
Low noise
Voltage noise: 2.3 nV/√Hz
Current noise: 2 pA/√Hz
Wide bandwidth
Small signal: 235 MHz (VGAx); 80 MHz (differential 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 @ ±3.3 V
APPLICATIONS
Multichannel data acquisition
Positron emission tomography
Gain trim
Industrial and medical ultrasound
Radar receivers
FUNCTIONAL BLOCK DIAGRAM
VOCM
VPOS
IPP1
GNH1
IPN1
ATTENUATOR
–24dB TO 0dB
VOH1
VOL1
IPP3
GNH3
IPN3
VOH3
VOL3
6dB
IPP4
GNH4
IPN4
+
–
PrA
6dB
+
–
PrA
6dB
+
–
PrA
6dB
+
–
PrA
6dB
VOH4
VOL4
6dB
IPP2
GNH2
IPN2
ATTENUATOR
–24dB TO 0dB
ATTENUATOR
–24dB TO 0dB
ATTENUATOR
–24dB TO 0dB
VOH2
VOL2
OPP2
GNLO
OPP3
OPP4
18dB
OFS2
OFS1
OFS3
OFS4
VNEG
VGA1
VGA2
VGA3
COMM
OPP1
VGA4
+
–
+
–
+
–
+
–
CH1 GAIN
CONTROL
CH2 GAIN
CONTROL
CH3 GAIN
CONTROL
CH4 GAIN
CONTROL
6dB
07736-
001
Figure 1.
GENERAL DESCRIPTION
The AD8264 is a 4-channel, linear-in-dB, general-purpose
variable gain amplifier (VGA) with a preamplifier (preamp),
and a flexible differential output buffer. Intended for a broad
range of applications, dc coupling combined with wide band-
width 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-
distortion 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 multi-output, digital-to-analog converter (DAC), each section
of the AD8264 can be used for active calibration or as a trim
amplifier.
The gain range of the VGA section is 24 dB. Operation from
a dual polarity power supply enables amplification of negative
voltage pulses that are generated by current-sinking pulses into
a grounded load, such as is typical of photodiodes or photo-
multiplier tubes (PMT). Delay-free processing of wide-band
video signals is also possible. The differential output amplifier
permits convenient level shifting and interfacing to single-
supply ADCs using the VOCM and OFSx pins.
The AD8264 is available in a 40-lead, 6 mm × 6 mm LFCSP
with an operating temperature range of 40°C to +105°C.
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