Features 100% Software compatible with the CLC5903 Pin compatible with the CLC5903 except for the analog input and reference section 123 dB dynamic range with CLC5526 DVGA (200kHz) On-chip precision reference User Programmable AGC with enhanced Power Detector Channel Filters include a Fourth Order CIC followed by 21-tap and 63-tap Symmetric FIRs Flexible output formats Serial and Parallel output ports JTAG Boundary Scan 8-bit Microprocessor Interface 128 pin PQFP Description The LM97593 Dual ADC / Digital Tuner / AGC IC is a two channel digital downconverter (DDC) with integrated 12-bit analog-to-digital converters (ADCs) and automatic gain control (AGC). The LM97593 further enhances National’s Diversity Receiver Chipset (DRCS) by integrating a wide-bandwidth dual ADC core with the DDC. The complete DRCS includes one LM97593 Dual ADC / Digital Tuner / AGC and two CLC5526 digitally controlled variable gain amplifiers (DVGAs). This system allows direct IF sampling of signals up to 300MHz for enhanced receiver performance and reduced system costs. A block diagram for a DRCS-based narrowband communications system is shown in . The LM97593 offers high dynamic range digital tuning and filtering based on hard-wired digital signal processing (DSP) technology. Each channel has independent tuning, phase offset, filter coefficients, and gain settings. Channel filtering is performed by a series of three filters. The first is a 4-stage Cascaded Integrator Comb (CIC) filter with a programmable decimation ratio from 8 to 2048. Next there are two symmetric FIR filters, a 21-tap and a 63-tap, both with independent programmable coefficients. The first FIR filter decimates the data by 2, the second FIR decimates by either 2 or 4. Channel filter bandwidth at 52MSPS ranges from ±650kHz down to ±1.3kHz. At 65MSPS, the maximum bandwidth increases to ±812kHz. The LM97593’s AGC controller monitors the ADC output and controls the ADC input signal level by adjusting the DVGA setting. AGC threshold, deadband+hysteresis, and the loop time constant are user defined. Total dynamic range of greater than 123dB full-scale signal to noise in a 200kHz bandwidth can be achieved with the Diversity Receiver Chipset. Key Specification Internal ADC Resolution 12 Bits Sample Rate 65 MSPS SNR (fIN = 250MHz, 11-bit, Nyquist) 62 dBFS (typ) SNR (fIN = 250MHz, 200kHz) 83 dBFS (typ) SFDR (fIN = 250MHz, 11-bit, Nyquist) 68 dBFS (typ) Full Power Bandwidth 650 MHz (typ) Power Consumption (65MSPS) 560 mW (typ) Applications Cellular Basestations GSM / GPRS / EDGE / GSM Phase 2 Receivers Satellite Receivers Wireless Local Loop Receivers Digital Communications

application circuit

Typical Application click for larger image application circuit	Block Diagram click for larger image block diagram 1

Datasheets

Title		Size	Date	Other Language
	LM97593 Dual ADC / Digital Tuner / AGC	3858 Kbytes	12-Mar-08

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM97593VH/NOPB LM97593VH RoHS Status	PQFP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 75 MOUSER Worldwide 56	$38.50 each at 1K+ pcs	tray of 66

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM97593.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM97593 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM97593VH/NOPB LM97593VH	1695.551 1700.001	PQFP	128	3 3	245 245	Detail	Download	N/A	NSUZXYYTTE# LM97593VH

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM97593.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM97593 is located at RoHS Status.

CAD Symbols and Models Download LM97593 CAD Symbols

Models N/A