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AD6600 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD6600 Arkusz danych(HTML) 1 Page - Analog Devices |
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1 / 25 page  REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD6600 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 FUNCTIONAL BLOCK DIAGRAM 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 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. 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 Pro- cessor. The AD6620 provides 10 dB–25 dB of additional pro- cessing gain before passing data to a fixed- or floating-point DSP. Driving the AD6600 is simplified by using the AD6630 differen- tial 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 in WLL/fixed-access systems. Units are available in plastic, surface-mount packages (44-lead LQFP) and specified over the industrial temperature range (–40 °C to +85°C). Dual Channel, Gain-Ranging ADC with RSSI GAIN A/D CONVERTER TIMING ENCODE SELECT GAIN +12, +18dB ENCODE FLT FLT NOISE FILTER RESONANT PORT 630 RSSI 3 TWO'S COMPLEMENT 11 AB_OUT D10–D0 RSSI [2:0] CLK2 DVCC ENC ENC GND AVCC B_SEL A_SEL GAIN GAIN RSSI 3 0dB, –12dB, –24dB ATTEN ATTEN 0dB, –12dB, –24dB DETECT PEAK SET RSSI AIN AIN BIN BIN AD6600 |
Podobny numer części - AD6600 |
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Podobny opis - AD6600 |
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