Datasheet AD8336 (Analog Devices)

General-Purpose, −55°C to +125°C, Wide Bandwidth, DC-Coupled VGA Data Sheet AD8336 FEATURES GENERAL DESCRIPTION Low noise
The AD8336 is a low noise, single-ended, linear in dB, general-
Voltage noise: 3 nV/√Hz
purpose variable gain amplifier, usable over a large range of
Current noise: 3 pA/√Hz
supply voltages. It features an uncommitted preamplifier with a
Small-signal BW: 115 MHz
usable gain range of 6 dB to 26 dB. The VGA gain range is 0 dB
Large-signal BW: 2 V p-p = 80 MHz
to 60 dB, with absolute gain limits of −26 dB to +34 dB. When
Slew rate: 550 V/µs, 2 V p-p
the preamplifier gain is adjusted for 12 dB, the combined 3 dB
Gain ranges (specified)
bandwidth of the preamplifier and VGA is 100 MHz, and the
−14 dB to +46 dB
amplifier is ful y usable to 80 MHz. With ±5 V supplies, the
0 dB to 60 dB
maximum output swing is 7 V p-p.
Gain scaling: 50 dB/V
Because of the X-AMP® architecture, frequency response is
DC-coupled
maintained across the entire gain range of the VGA. The differen-
Single-ended input and output
tial gain control interface provides precise linear in dB gain scaling
Supplies:
±
3 V to
±
12 V
of 50 dB/V over the temperature span of −55°C to +125°C and
Temperature range: −55°C to +125°C Power
is simple to interface with a variety of external sources.
150 mW at
±
3 V, −55°C < T < +125°C
The large supply voltage range makes the AD8336 suited for
84 mW at ±3 V, PWRA = 3 V
industrial medical applications and video circuits. Dual-supply
APPLICATIONS
operation enables bipolar input signals, such as those generated by photodiodes or photomultiplier tubes.
Industrial process controls
The fully independent voltage feedback preamplifier allows both
High performance AGC systems
inverting and noninverting gain topologies. The AD8336 can be
I/Q signal processing
used within the specified gain range of −14 dB to +60 dB by
Video
selecting a preamplifier gain between 6 dB and 26 dB and choosing
Industrial and medical ultrasound
appropriate feedback resistors. For the nominal preamplifier gain of
Radar receivers
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 + PRAO VGAI ATTENUATOR PREAMP 8 9 34dB 1 VOUT –60dB TO 0dB INPN 5 – GAIN CONTROL PWRA 2 BIAS INTERFACE 10 13 3 11 12
001
VNEG VPOS VCOM GPOS GNEG
06228- Figure 1.
Rev. F 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2006–2017 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUITS THEORY OF OPERATION OVERVIEW PREAMPLIFIER VGA SETTING THE GAIN NOISE OFFSET VOLTAGE APPLICATIONS INFORMATION AMPLIFIER CONFIGURATION PREAMPLIFIER Circuit Configuration for Noninverting Gain Circuit Configuration for Inverting Gain USING THE POWER ADJUST FEATURE DRIVING CAPACITIVE LOADS EVALUATION BOARD OPTIONAL CIRCUITRY BOARD LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE