LTC6602 Dual Matched, High Frequency Bandpass/Lowpass Filters FEATURES DESCRIPTION n Matched Dual Filter/Driver, Ideal for RFID Readers The LTC 6602 is a dual, matched, programmable bandpass n Guaranteed Phase Matching to Within 2 Degrees or lowpass filter and differential driver. The selectivity of the n Guaranteed Gain Matching to Within 0.2dB LTC6602, combined with its phase matching and dynamic n Configurable as Lowpass or Bandpass: range, make it ideal for filtering in RFID systems. With two Programmable 5th Order Lowpass: 42kHz to 900kHz degree phase matching between channels, the LTC6602 can Programmable 4th Order Highpass: 4.2kHz to 90kHz be used in applications requiring highly matched filters, n Programmable Gain: 1, 4, 16, 32 such as transceiver I and Q channels. Gain programmabil- n Simple Pin Programming or SPI Interface ity, and the fully differential inputs and outputs, simplify n Low Noise: 145dBm/Hz (Input Referred) implementation in most systems. n Low Distortion: 75dBc at 200kHz Both channels of the LTC6602 consist of a programmable n Differential, Rail-to-Rail Inputs and Outputs lowpass and highpass filter. For bandpass functionality, n Input Range Extends from 0V to 5V the lowpass filters are programmed for the upper cutoff n Low Voltage Operation: 2.7V to 3.6V frequency. For lowpass functionality, the highpass filters n Shutdown Mode can be bypassed. The filter cutoff frequencies can be set n 4mm 4mm QFN Package with a guaranteed accuracy of 3% with the use of a single resistor. Alternatively, the filter cutoff frequencies can be APPLICATIONS controlled with an external clock. n Multiprotocol RFID Readers: EPC-GEN2, ISD and IPX The LTC6602 operates on a single 2.7V to 3.6V supply n IDEN, PHS, GSM Basestations and features a low power shutdown mode. n Repeaters, Radio Links, and Modems n L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Wireless Telemetry Technology Corporation. All other trademarks are the property of their respective owners. n JTRS TYPICAL APPLICATION UHF RFID Reader Dual Baseband Filter and Dual ADC 3V 0.1F 0.1F + 100 A IN Gain vs Frequency 100pF 14-BIT 20 V+ V+ V+ 100pF IN A D EXTERNAL CLOCK = 90MHz ADC 100pF 100 A IN +INA OUTA 10 15kHz-150kHz BPF I INPUT I OUTPUT 90kHz-900kHz BPF INA +OUTA 0 V CM +INB OUTB 2.2F LTC2297 10 Q INPUT Q OUTPUT INB +OUTB + 100 LTC6602 B IN 20 R CLKIO BIAS 38.3k 0.1F 100pF V SER OCM 14-BIT 30 100pF ADC MUTE CLKCNTL 100pF 100 B 40 IN GAIN0(D0) HPF0(SDO) MUTE 50 45kHz-300kHz BPF INPUT GAIN1 HPF1(SDI) CLK IN FROM 6602 TA01 60 GND LPF0(SCLK) TRANSMITTER 1k 10k 100k 1M 10M GND LPF1(CS) FREQUENCY (Hz) 4 6602 TA01b CS SCLK SDI SPI CONTROL INPUT CLOCK INPUT 24MHz TO 128MHz (COVERS THE TAG BACKSCATTER LINK FREQUENCY RANGE OF 40kHz to 640kHz OF THE CLASS 1 GENERATION 2 UHF RFID COMMUNICATION PROTOCOL) 6602fc 1 GAIN (dB)LTC6602 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW V+ to GND ................................................................6V IN V+ V+ to GND .........................................................4V A, D Filter Inputs to GND ....................... 0.3V to V+ + 0.3V IN 24 23 22 21 20 19 All Other Pins to GND .............. 0.3V to V+ , V+ + 0.3V A D Output Short-Circuit Duration .......................... Indefinite V+ 1 18 OUTA IN V+ 2 17 SER A Operating Temperature Range (Note 2) V 3 16 V+ OCM D LTC6602CUF ........................................ 40C to 85C 25 R 4 15 CLKIO BIAS LTC6602IUF ......................................... 40C to 85C CLKCNTL GND 5 14 Specified Temperature Range (Note 3) LPF1(CS) 6 13 +OUTB LTC6602CUF ............................................ 0C to 70C 7 8 9 10 11 12 LTC6602IUF ......................................... 40C to 85C Storage Temperature Range ................... 65C to 150C UF PACKAGE 24-LEAD (4mm 4mm) PLASTIC QFN T = 150C, = 37C/W JMAX JA EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO THE PCB. ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTC6602CUF PBF LTC6602CUF TRPBF 6602 24-Lead (4mm 4mm) Plastic QFN 0C to 70C LTC6602IUF PBF LTC6602IUF TRPBF 6602 24-Lead (4mm 4mm) Plastic QFN 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: