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AD6600

Analog Devices
Part Number AD6600
Manufacturer Analog Devices
Description Dual Channel/ Gain-Ranging ADC with RSSI
Published Mar 23, 2005
Detailed Description a FEATURES Dual IF Inputs, 70 MHz–250 MHz Diversity or Two Independent IF Signals Separate Attenuation Paths Oversample ...
Datasheet PDF File AD6600 PDF File

AD6600
AD6600

Overview
a 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 2 ؋ 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 Dual Channel, Gain-Ranging ADC with RSSI AD6600 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 control 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.
The primary use for the dual analog input structure is sampling both antennas in a two-antenna diversity receiver.
However, Channels A and B may also be used to sample two independent IF signals.
Diversity, or dual-channel mode, is limited to 10 MSPS per channel.
In single-channel mode, the full clock rate of 20 MSPS may be applied to a single carrier.
The AD6600 may be used as a stand-alone sampling chip, or it may be combined with the AD6620 Digital Receive Signal Processor.
The AD6620 provides 10 dB–25 dB of additional processing gain before passing data to a fixed- or floating-point DSP.
Driving the AD6600 is simplified by using the AD6630 differential IF amplifier.
The AD6630 is easily matched to inexpensive SAW filters from 70 MHz to 250 MHz.
Designed specifically for cellular/PCS receivers, the AD6600 supports GSM, IS-136, CDMA and Wireless LANs, as well as proprietary air interfaces used...


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