600 MH, 45 B Digitally Controlled Variable Gain Amplifier

The AD8369 is a high performance, digitally controlled variable gain amplifier, designed to be used at IF frequencies within cellular receivers.

The device features a 4-bit digitally controlled gain control interface configurable for either parallel or 3 wire serial control. The gain control range spans 45 dB adjustable in 3 dB increments.

The AD8369 is ideally suited to be used in digital IF receivers and is fully specified for operation at common IF frequencies 70 / 140 / 190 / 240 / 380 MHz. The gain stability and flatness is below 0.1 dB over a 20 MHz channel bandwidth at 380 MHz. Coupled with the low distortion and the ability to drive 200 Ω or 1 K Ω, the AD8369 allows optimal placement and flexibility as a high IF gain control element.

The AD8369 is fabricated on an advanced silicon bipolar process, operating on a single 3 or 5 volt supply, packaged in space saving 16-lead thin shrunk small outline (TSSOP) package and fully specified over the –40ºC to +85ºC temperature range.

* Wide bandwidth 600 MHz

(-3 dB bandwidth)

* Digitally controlled gain in 3 dB steps

* 4-bit parallel or 3-wire serial interface

* Gain control range 45 dB with max gain 40 dB

* Flat gain response out to

380 MHz, <0.2 dB over

20 MHz signal bandwidth

* High linearity output IP3

19.5 dBm @ 70 MHz

* Single ended 200 Ω input and output impedance

* Small footprint 16-lead TSSOP package