AD8376 Datasheet, PDF (1/12 Pages) Analog Devices – Ultra Low Distortion IF Dual VGA

Preliminary Technical Data
FEATURES
Dual Independent Digitally Controlled VGAs
-4 to 20dB Gain Range
1 dB Step Size ± 0.2 dB
Differential input and output
150 Ω Differential Input
Open Collector Differential Output
8.7 dB noise figure @ maximum gain
OIP3 of ~50dBm at 140MHz
−3 dB bandwidth of 700 MHz
Excellent Channel to Channel Isolation
Two Parallel 5-bit Control Interfaces
Wide input dynamic range
Power-down Control
Single 5V Supply Operation
32 Lead LFCSP 5 x 5 mm Package
APPLICATIONS
Differential ADC drivers
Main and Diverstiy IF Sampling Receivers
High Output Power IF Amplification
Multi-channel Receivers
Instrumentation
GENERAL DESCRIPTION
The AD8376 is a dual channel digitally controlled, variable gain
wide bandwidth amplifier that provides precise gain control,
high IP3 and low noise figure. The excellent distortion
performance and high signal bandwidth makes the AD8376 an
excellent gain control device for a variety of receiver
applications.
For wide input dynamic range applications, the AD8376 pro-
vides a broad 24 dB gain range with 1 dB resolution. The gain of
each channel is adjusted through dedicated 5-pin control
interfaces and can be driven using standard TTL levels. The
open-collector outputs provide a flexible interface, allowing the
overall signal gain to be set by the loading resistance. The
AD8376 offers a maximum trans-conductance gain of
67 mΩ^-1’s. This results in a signal voltage gain proportional to
the load resistance. When driving a 150 Ω differential load, the
maximum signal gain will be 20 dB.
Ultra Low Distortion IF Dual VGA
AD8376
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
Using a high speed SiGe process and incorporating proprietary
distortion cancellation techniques, the AD8376 achieves
50 dBm output IP3 at 140 MHz.
Each channel of the AD8376 can be individually powered on by
applying the appropriate logic level to the ENBA and ENBB
power enable pins. The quiescent current of the AD8376 is
typically 130 mA per channel. When powered down, the
AD8376 consumes less than 5mA and offers excellent input to
output isolation, lower than -50 dB at 200 MHz.
Fabricated on an ADI’s high speed SiGe process, the AD8376
provides precise gain adjustment capabilities with good distortion
performance. The AD8376 amplifier comes in a compact,
thermally enhanced 5 x 5mm 32-lead LFCSP package and
operates over the temperature range of −40°C to +85°C.
Rev. PrD
March 13, 2007
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