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LTC6602 - Dual Matched, High Frequency Bandpass/Lowpass Filters

The LTC6602 is a dual, matched, programmable bandpass or lowpass filter and differential driver. The selectivity of the LTC6602, combined with its phase matching and dynamic range, make it ideal for filtering in RFID systems. With two degree phase matching between channels, the LTC6602 can be used in applications requiring highly matched filters, such as transceiver I and Q channels. Gain programmability, and the fully differential inputs and outputs, simplify implementation in most systems.

Both channels of the LTC6602 consist of a programmable lowpass and highpass filter. For bandpass functionality, the lowpass filters are programmed for the upper cutoff frequency. For lowpass functionality, the highpass filters can be bypassed. The filter cutoff frequencies can be set with a guaranteed accuracy of 3% with the use of a single resistor. Alternatively, the filter cutoff frequencies can be controlled with an external clock.

The LTC6602 operates on a single 2.7V to 3.6V supply and features a low power shutdown mode.

Features Matched Dual Filter/Driver, Ideal for RFID Readers Guaranteed Phase Matching to Within 2 Degrees Guaranteed Gain Matching to Within 0.2dB Configurable as Lowpass or Bandpass: – Programmable 5th Order Lowpass: 42kHz to 900kHz – Programmable 4th Order Highpass: 4.2kHz to 90kHz Programmable Gain: 1×, 4×, 16×, 32× Simple Pin Programming or SPI Interface Low Noise: –145dBm/Hz (Input Referred) Low Distortion: –75dBc at 200kHz Differential, Rail-to-Rail Inputs and Outputs Input Range Extends from 0V to 5V Low Voltage Operation: 2.7V to 3.6V Shutdown Mode 4mm × 4mm QFN Package Typical Application

Applications Multiprotocol RFID Readers: EPC-GEN2, ISD and IPX IDEN, PHS, GSM Basestations Repeaters, Radio Links, and Modems Wireless Telemetry JTRS Packaging

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