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ADA4938-1ACPZ-R7 Arkusz danych(PDF) 1 Page - Analog Devices

Numer części ADA4938-1ACPZ-R7
Szczegółowy opis  Ultra-Low Distortion Differential ADC Driver
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Ultra-Low Distortion
Differential ADC Driver
Preliminary Technical Data
ADA4938-1
Rev. PrD
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
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
www.analog.com
Fax: 781.461.3113
©2007 Analog Devices, Inc. All rights reserved.
FEATURES
Extremely low harmonic distortion
−112 dBc HD2 @ 10 MHz
−79 dBc HD2 @ 50 MHz
−102 dBc HD3 @ 10 MHz
−81 dBc HD3 @ 50 MHz
Low input voltage noise: 2.2 nV/√Hz
High speed
−3 dB bandwidth of 1.5 GHz, G = 1
Slew rate: 4700 V/μs
0.1 dB gain flatness to 125 MHz
Fast overdrive recovery of 4 ns
1 mV typical offset voltage
Externally adjustable gain
Differential to differential or single-ended to differential
operation
Adjustable output common-mode voltage
Wide Supply Voltage Range: +5 V & ± 5 V
Pb-free 3 mm x 3 mm LFCSP package
APPLICATIONS
ADC drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
Line drivers
FUNCTIONAL BLOCK DIAGRAM
+
Figure 1.
GENERAL DESCRIPTION
The ADA4938-1 is a low noise, ultra-low distortion, high speed
differential amplifier. It is an ideal choice for driving high
performance ADCs with resolutions up to 16 bits from dc to 70
MHz. The output common mode voltage is adjustable over a
wide range, allowing the ADA4938-1 to match the input of the
ADC. The internal common mode feedback loop also provides
exceptional output balance as well as suppression of even-order
harmonic distortion products.
Full differential and single-ended to differential gain
configurations are easily realized with the ADA4938-1. A
simple external feedback network of four resistors determines
the amplifier’s closed-loop gain.
The ADA4938-1 is fabricated using ADI’s proprietary third
generation high-voltage XFCB process, enabling it to achieve
very low levels of distortion with input voltage noise of only 2.2
nV/√Hz. The low dc offset and excellent dynamic performance
of the ADA4938-1 make it well suited for a wide variety of data
acquisition and signal processing and applications.
The ADA4938-1 is available in a Pb-free, 3 mm x 3mm lead
frame chip scale package (LFCSP). Pinout has been optimized
to facilitate layout and minimize distortion. The part is
specified to operate over the extended industrial temperature
range of −40°C to +85°C.


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