LM97593 - Dual ADC / Digital Tuner / AGC
Datasheet Packaging Samples & Pricing Knowledge Base

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

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)

General 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). More...


Applications


Cellular Basestations
GSM / GPRS / EDGE / GSM Phase 2 Receivers
Satellite Receivers
Wireless Local Loop Receivers
Digital Communications
  Typical Application
click for larger image

application circuit

ParametersValues
Temperature Min -40 deg C
Temperature Max 85 deg C

  Block Diagram
click for larger image

block diagram 1

Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM97593 Dual ADC / Digital Tuner / AGC 3858
Kbytes
12-Mar-08 Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders
Budgetary PricingStd
Pack
Size
Package
Marking
Format
TypePinsSpec.MSL
Rating
Peak
Reflow
RoHS
Report
CAD
Symbols
WeeksQtyQty$US each
LM97593VHPQFP128NOPB
STD
3
3
245
245
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$38.50tray
of
66
NSUZXYYTTE#
LM97593VH
6 weeksN/A

General 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.

[Information as of 8-Nov-2009]