Dual, 35 dB Range, 1 dB Step Size DGA

Data Sheet

ADL5205

Rev. 0

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FEATURES

Dual, independent, digitally controlled gain amplifier (DGA)

−9 dB to +26 dB gain range

1 dB step size, ±0.2 dB accuracy at 200 MHz

100 Ω differential input resistance

10 Ω differential output resistance

1.2 dB change in noise figure for first 12 dB of gain reduction

Output third-order intercept (OIP3): 48.5 dBm at 200 MHz, 5 V,

high performance mode

−3 dB bandwidth: 1700 MHz typical in high performance

mode

Multiple control interface options

Parallel 6-bit control interface with latch

Serial peripheral interface (SPI) with fast attack

Gain step up/down interface

Wide input dynamic range

Low power mode

Power-down control

Single 3.3 V or 5 V supply operation

40-lead, 6 mm × 6 mm LFCSP package

APPLICATIONS

Differential analog-to-digital converter (ADC) drivers

High intermediate frequency (IF) sampling receivers

High output power IF amplification

Instrumentation

FUNCTIONAL BLOCK DIAGRAM

14dB

TO

26dB

GND

VPOS

VINA+

VINA–

0dB TO 23dB

10

Ω

10

Ω

100

Ω

100

Ω

SIDE A

SPI WITH FA,

PARALLEL WITH LATCH,

UP/DOWN

SIDE B

SPI WITH FA,

PARALLEL WITH LATCH,

UP/DOWN

VOUTA–

VOUTA+

ADL5205

PM

MODE0

MODE1

VINB+

VINB–

VOUTB–

VOUTB+

0dB TO 23dB

LOGIC

LOGIC

CONTROL

CIRCUITRY

PWUPA

PWUPB

14dB

TO

26dB

Figure 1.

GENERAL DESCRIPTION

The ADL5205 is a digitally controlled, wide bandwidth, variable

gain dual amplifier (DGA) that provides precise gain control, high

output third-order intercept (OIP3) and a near constant noise

figure for the first 12 dB of attenuation. The excellent OIP3

performance of 48.5 dBm (at 200 MHz, 5 V, high performance

mode, and maximum gain) makes the ADL5205 an excellent

gain control device for a variety of receiver applications.

For wide input dynamic range applications, the ADL5205

provides a broad 35 dB gain range with a 1 dB step size. The

gain is adjustable through multiple gain control and interface

options: parallel, SPI, or gain step up/down control.

The two channels of the ADL5205 can be powered up

independently by applying the appropriate logic level to the

PWUPA and PWUPB pins. The quiescent current of the ADL5205

is typically 175 mA for high performance mode and 135 mA for

low power mode. When disabled, the ADL5205 consumes only

14 mA and offers excellent input to output isolation. The gain

setting is preserved when the device is disabled.

Fabricated on the Analog Devices, Inc., high speed, silicon

germanium (SiGe) complementary BiCMOS process, the

ADL5205 provides precise gain adjustment capabilities with good

distortion performance. The ADL5205 amplifier comes in a

compact, thermally enhanced, 6 mm × 6 mm, 40-lead LFCSP

package and operates over the temperature range of −40°C to

+85°C.

Note that throughout this data sheet, multifunction pins, such

as CSA/A3, are referred to by the entire pin name or by a single

function of the pin, for example, CSA, when only that function

is relevant.