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Analog Devices - DC-Coupled VGA

Numéro de référence AD8336
Description DC-Coupled VGA
Fabricant Analog Devices 
Logo Analog Devices 





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AD8336 fiche technique
Data Sheet
General-Purpose, −55°C to +125°C,
Wide Bandwidth, DC-Coupled VGA
AD8336
FEATURES
Low noise
Voltage noise: 3 nV/√Hz
Current noise: 3 pA/√Hz
Small-signal BW: 115 MHz
Large-signal BW: 2 V p-p = 80 MHz
Slew rate: 550 V/µs, 2 V p-p
Gain ranges (specified)
−14 dB to +46 dB
0 dB to 60 dB
Gain scaling: 50 dB/V
DC-coupled
Single-ended input and output
Supplies: ±3 V to ±12 V
Temperature range: −55°C to +125°C
Power
150 mW at ±3 V, −55°C < T < +125°C
84 mW at ±3 V, PWRA = 3 V
APPLICATIONS
Industrial process controls
High performance AGC systems
I/Q signal processing
Video
Industrial and medical ultrasound
Radar receivers
GENERAL DESCRIPTION
The AD8336 is a low noise, single-ended, linear in dB, general-
purpose variable gain amplifier, usable over a large range of
supply voltages. It features an uncommitted preamplifier with a
usable gain range of 6 dB to 26 dB. The VGA gain range is 0 dB
to 60 dB, with absolute gain limits of −26 dB to +34 dB. When
the preamplifier gain is adjusted for 12 dB, the combined 3 dB
bandwidth of the preamplifier and VGA is 100 MHz, and the
amplifier is fully usable to 80 MHz. With ±5 V supplies, the
maximum output swing is 7 V p-p.
Because of the X-AMP® architecture, frequency response is
maintained across the entire gain range of the VGA. The differen-
tial gain control interface provides precise linear in dB gain scaling
of 50 dB/V over the temperature span of −55°C to +125°C and
is simple to interface with a variety of external sources.
The large supply voltage range makes the AD8336 suited for
industrial medical applications and video circuits. Dual-supply
operation enables bipolar input signals, such as those generated
by photodiodes or photomultiplier tubes.
The fully independent voltage feedback preamplifier allows both
inverting and noninverting gain topologies. The AD8336 can be
used within the specified gain range of −14 dB to +60 dB by
selecting a preamplifier gain between 6 dB and 26 dB and choosing
appropriate feedback resistors. For the nominal preamplifier gain of
4×, the overall gain range is −14 dB to +46 dB.
If required, quiescent power is limited to a safe level by
asserting the PWRA pin.
FUNCTIONAL BLOCK DIAGRAM
AD8336
INPP 4
INPN 5
+
PREAMP
PRAO VGAI
89
ATTENUATOR
–60dB TO 0dB
34dB
1 VOUT
PWRA 2
BIAS
GAIN CONTROL
INTERFACE
10
VNEG
13
VPOS
3
VCOM
11
GPOS
Figure 1.
12
GNEG
Rev. D
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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 ©2006–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com

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