7013

a FEATURES Single +5 V Supply Receive Channel Differential or Single-Ended Analog Inputs Auxiliary Set of Analog I & Q Inputs Two Sigma-Delta A/D Converters Choice of Two Digital FIR Filters Root-Raised-Cosine Rx Filters, α = 0.35 Brick Wall FIR Rx Filters On-Chip or User Rx Offset Calibration ADC Sampling Vernier Three Auxiliary DACs On-Chip Voltage Reference Low Active Power Dissipation, Typical 45 mW Low Sleep Mode Power Dissipation, <50 µ W 28-Pin SSOP APPLICATIONS American TIA Digital Cellular Telephony American Analog Cellular Telephony Digital Baseband Receivers GENERAL DESCRIPTION The AD7013 is a complete low power, CMOS, TIA IS-54 baseband receive port with single +5 V power supply. The part is CMOS TIA IS-54 Baseband Receive Port AD7013 designed to perform the baseband conversion of I and Q waveforms in accordance with the American (TIA IS-54) Digital Cellular Telephone system. The receive path consists of two high performance sigma-delta ADCs, each followed by a FIR digital filter. A primary and auxiliary set of IQ differential analog inputs are provided, where either can be selected as inputs to the sigma-delta ADCs. Also, a choice of two frequency responses are available for the receive FIR filters; a Root-Raised-Cosine filter for digital mode or a brick wall response for analog mode. Differential analog inputs are provided for both I and Q channels. On-chip calibration logic is also provided to remove either on-chip offsets or remove system offsets. A 16-bit se...