GENERAL DESCRIPTION

The AD6636 is a digital downconverter intended for IF sampling or oversampled baseband radios requiring wide bandwidth input signals. The AD6636 has been optimized for the demanding filtering requirements of wideband standards, such as CDMA2000, UMTS, and TD-SCDMA, but is flexible enough to support wider standards such as WiMAX. The AD6636 is designed for radio systems that use either an IF sampling ADC or a baseband sampling ADC.

FEATURES

4/6 independent wideband processing channels

Processes 6 wideband carriers (UMTS, CDMA2000)

4 single-ended or 2 LVDS parallel input ports

(16 linear bit plus 3-bit exponent) running at 150 MHz

Supports 300 MSPS input using external interface logic

Three 16-bit parallel output ports operating up to 200 MHz

Real or complex input ports

Quadrature correction and dc correction for complex inputs

Supports output rate up to 34 MSPS per channel

RMS/peak power monitoring of input ports

Programmable attenuator control for external gain ranging

3 programmable coefficient FIR filters per channel

2 decimating half-band filters per channel

6 programmable digital AGC loops with 96 dB range

Synchronous serial I/O operation (SPI®-, SPORT-compatible)

Supports 8-bit or 16-bit microport modes

3.3 V I/O, 1.8 V CMOS core

User-configurable, built-in, self-test (BIST) capability

JTAG boundary scan

APPLICATIONS

Multicarrier, multimode digital receivers

GSM, EDGE, PHS, UMTS, WCDMA, CDMA2000, TD-SCDMA,

WiMAX

Micro and pico cell systems, software radios

Broadband data applications

Instrumentation and test equipment

Wireless local loops

In-building wireless telephony