PRODUCT DESCRIPTION

The AD6600 mixed-signal receiver chip directly samples signals at analog input frequencies up to 250 MHz. The device includes two input channels, each with 1 GHz input amplifiers and 30 dB of automatic gain-ranging circuitry. Both channels are sampled with a 450 MHz track-and-hold followed by an 11-bit, 20 MSPS analog-to-digital converter. Digital RSSI outputs, an A/B channel indicator, a 2× Clock output, references, and con trol circuitry are all on-chip. Digital output signals are two’s complement, CMOS-compatible and interface directly to 3.3 V or 5 V digital processing chips.

FEATURES

Dual IF Inputs, 70 MHz–250 MHz

Diversity or Two Independent IF Signals

Separate Attenuation Paths

Oversample RF Channels

20 MSPS on a Single Carrier

10 MSPS/Channel in Diversity Mode

Total Signal Range 90+ dB

30 dB from Automatic Gain-Ranging (AGC)

60 dB from A/D Converter

Range >100 dB After Processing Gain

Digital Outputs

11-Bit ADC Word

3-Bit RSSI Word

2x Clock, A/B Indicator

Single 5 V Power Supply

Output DVCC 3.3 V or 5 V

775 mW Power Dissipation

APPLICATIONS

Communications Receivers

PCS/Cellular Base Stations

GSM, CDMA, TDMA

Wireless Local Loop, Fixed Access