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LTC6602

更新时间： 2024-02-05 09:06:26
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凌特 - Linear /
页数 文件大小 规格书
28页 573K
描述
Dual Matched, High Frequency Bandpass/Lowpass Filters

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LTC6602 数据手册

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LTC6602  
Dual Matched, High  
Frequency Bandpass/Lowpass Filters  
DESCRIPTION  
FEATURES  
TheLTC®6602isadual,matched,programmablebandpass  
orlowpassfilteranddifferentialdriver.Theselectivityofthe  
LTC6602, combined with its phase matching and dynamic  
range, make it ideal for filtering in RFID systems. With two  
degreephasematchingbetweenchannels,theLTC6602can  
be used in applications requiring highly matched filters,  
such as transceiver I and Q channels. Gain programmabil-  
ity, and the fully differential inputs and outputs, simplify  
implementation in most systems.  
n
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  
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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.  
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  
APPLICATIONS  
n
Multiprotocol RFID Readers:  
The LTC6602 operates on a single 2.7V to 3.6V supply  
and features a low power shutdown mode.  
EPC-GEN2, ISD and IPX  
n
IDEN, PHS, GSM Basestations  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners..  
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Repeaters, Radio Links, and Modems  
n
Wireless Telemetry  
JTRS  
n
TYPICAL APPLICATION  
UHF RFID Reader Dual Baseband Filter and Dual ADC  
Gain vs Frequency  
3V  
20  
10  
EXTERNAL CLOCK = 90MHz  
0.1μF  
0.1μF  
+
100Ω  
100Ω  
15kHz-150kHz BPF  
90kHz-900kHz BPF  
A
IN  
0
100pF  
100pF  
14-BIT  
ADC  
V+  
V+  
A
V+  
D
100pF  
IN  
–10  
–20  
–30  
–40  
–50  
–60  
–
A
–OUTA  
+OUTA  
–OUTB  
+OUTB  
CLKIO  
SER  
IN  
IN  
+INA  
–INA  
+INB  
–INB  
I INPUT  
Q INPUT  
0.1μF  
I OUTPUT  
Q OUTPUT  
V
CM  
2.2μF  
LTC2297  
+
100Ω  
100Ω  
LTC6602  
B
R
BIAS  
OCM  
45kHz-300kHz BPF  
38.3k  
100pF  
100pF  
V
14-BIT  
ADC  
100pF  
CLKCNTL  
HPF0(SDO)  
HPF1(SDI)  
LPF0(SCLK)  
LPF1(CS)  
1k  
10k  
100k  
1M  
10M  
MUTE  
GAIN0(D0)  
GAIN1  
GND  
–
B
IN  
FREQUENCY (Hz)  
6602 TA01b  
MUTE  
INPUT  
FROM  
CLK IN  
6602 TA01  
TRANSMITTER  
GND  
÷4  
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)  
6602fa  
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