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LTC6603CUF-TRPBF PDF预览

LTC6603CUF-TRPBF

更新时间: 2024-11-25 05:44:03
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凌特 - Linear /
页数 文件大小 规格书
24页 262K
描述
Dual Adjustable Lowpass Filter

LTC6603CUF-TRPBF 数据手册

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LTC6603  
Dual Adjustable  
Lowpass Filter  
FEATURES  
DESCRIPTION  
The LTC®6603 is a dual, matched, programmable lowpass  
filter for communications receivers and transmitters. The  
selectivity of the LTC6603, combined with its linear phase,  
phase matching and dynamic range, make it suitable for  
filtering in many communications systems. With 1.5°  
phase matching between channels, the LTC6603 can be  
used in applications requiring pairs of matched filters,  
such as transceiver I and Q channels. Furthermore, the  
differential inputs and outputs provide a simple interface  
for most communications systems.  
n
Guaranteed Phase and Gain Matching Specs  
n
Programmable BW Up to 2.5MHz  
n
Programmable Gain (0dB/6dB/12dB/24dB)  
n
9th Order Linear Phase Response  
n
Differential, Rail-to-Rail Inputs and Outputs  
n
Low Noise: –145dBm/Hz (Input Referred)  
n
Low Distortion: –75dBc at 200kHz  
n
Simple Pin Programming or SPI Interface  
n
Set the Max Speed/Power with an External R  
n
Operates from 2.7V to 3.6V  
n
Input Range from 0V to 5.5V  
The sampled data filter does not require an external clock  
yet its cutoff frequency can be set with a single external  
resistor with an accuracy of 3.5% or better. The external  
resistor programs an internal oscillator whose frequency  
is divided prior to being applied to the filter networks.  
This allows up to three cutoff frequencies that can be  
obtained for each external resistor value, allowing the  
cutoff frequency to be programmed over a range of more  
than six octaves. Alternatively, the cutoff frequency can  
be set with an external clock. The filter gain can also be  
programmed to 1, 2, 4 or 16.  
n
4mm × 4mm QFN Package  
APPLICATIONS  
n
Small/Low Cost Basestations:  
IDEN, PHS, TD-SCDMA, CDMA2000, WCDMA,  
UMTS  
n
Low Cost Repeaters, Radio Links, and Modems  
n
802.11x Receivers  
JTRS  
n
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
The LTC6603 features a low power shutdown mode that  
can be programmed through the serial interface and is  
available in a 24-pin 4mm × 4mm QFN package.  
TYPICAL APPLICATION  
2.5MHz I and Q Lowpass Filter and Dual ADC  
5V  
3V  
LTC2297  
100nH*  
49.9Ω  
Phase Matching  
0.1μF  
0.1μF  
180pF  
180pF  
10pF  
10pF  
60  
I OUTPUT  
14-BIT  
ADC  
V
= 3V, BW = 156.25kHz  
S
f = 125kHz, T = 25°C  
V+  
V+  
V+  
D
A
IN  
A
50 1000 UNITS  
100nH*  
49.9Ω  
+INA  
–INA  
+INB  
–INB  
+OUTA  
–OUTA  
+OUTB  
–OUTB  
CLKIO  
I
IN  
40  
30  
20  
10  
0
100nH*  
49.9Ω  
Q
IN  
LTC6603  
R
180pF  
180pF  
10pF  
10pF  
BIAS  
0.1μF  
0.1μF  
Q OUTPUT  
100nH*  
14-BIT  
ADC  
30.9k  
V
SER  
OCM  
49.9Ω  
V
CM  
3V  
3V  
CAP  
CLKCNTL  
–2.5 –2 –1.5 –1 –0.5  
0
0.5  
1
1.5  
2
2.5  
2.2μF  
GAIN1  
GAIN0  
SDO  
SDI  
MISMATCH (DEG)  
6603 TA01b  
GND  
GND  
LPFO  
LPF1  
*COILCRAFT 0603HP  
BASEBAND  
GAIN CONTROL  
6603 TA01a  
6603f  
1

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