General-Purpose, −55°C to +125°C,

Wide Bandwidth, DC-Coupled VGA

Data Sheet

AD8336

Rev. F

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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

VOUT

VGAI

PRAO

GNEG

AD8336

VCOM

VPOS

GPOS

34dB

PREAMP

PWRA

ATTENUATOR

–60dB TO 0dB

GAIN CONTROL

INTERFACE

INPP

INPN

+

–

BIAS

VNEG

4

5

2

13

3

11

12

1

10

9

8

Figure 1.