LTC1264CS Linear Technology, LTC1264CS Datasheet

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LTC1264CS

Manufacturer Part Number
LTC1264CS
Description
High Speed/ Quad Universal Filter Building Block
Manufacturer
Linear Technology
Datasheet

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TYPICAL
FEATURE
A
MAXIMUM
f
160kHz
120kHz
CENTER
60kHz
PPLICATI
, LTC and LT are registered trademarks of Linear Technology Corporation.
IN
High Speed, Up to 250kHz Center Frequency
Four Identical Filters in a 0.3" Wide Package
Clock-to-Center Frequency Ratio of 20:1
Double-Sampling, Improved Aliasing
Operates from 2.37V to 8V Power Supplies
Customized Version with Internal Resistors Available
Low Noise
Low Harmonic Distortion
Digital Communications
Spread Spectrum Communications
Spectral Analysis
Loran Receivers
Instrumentation
Clock-Tunable 8th Order Bandpass Filter, f
50k
Single 5V
SUPPLY
POWER
7.5V
5V
50k
A
S
10k
10k
50k
50k
PPLICATI
O
0.1 F
U
S
INV B
HPB/NB
BPB
LPB
SB
AGND
V
SA
LPA
BPA
HPA/NA
INV A
+
LTC1264
O
50k
50k
HPD/ND
U
HPC/NC
INV D
INV C
BPD
BPC
LPC
CLK
LPD
SD
SC
V
CENTER
f
CLK
10k
50k
50k
10k
= f
0.1 F
CLK
/20
1264 TA01
OUT
High Speed, Quad Universal
D
The LTC
order switched-capacitor filter building blocks designed
for center frequencies up to 250kHz. Each building block,
together with three to five resistors, can provide 2nd order
functions like lowpass, highpass, bandpass and notch.
The center frequency of each 2nd order section is tuned via
an external clock. The clock-to-center frequency ratio is
internally set to 20:1, but it can be modified via external
resistors.
The aliasing performance of the LTC1264 is improved by
double-sampling each 2nd order section. Input signal
frequencies can reach up to twice the clock frequency
before any alias products will be detectable.
For Q
frequency is 160kHz. For Q
frequency is 250kHz. Up to 8th order filters can be realized
by cascading all four 2nd order sections.
A customized monolithic version of the LTC1264 includ-
ing internal thin film resistors can be obtained.
ESCRIPTIO
®
1264 consists of four identical, high speed 2nd
100kHz Bandpass, f
5 and for T
–10
–20
–30
–40
–50
–60
–70
–80
10
0
10k
Filter Building Block
U
Gain vs Frequency
A
< 85 C, the maximum center
FREQUENCY (Hz)
–3dB
100k
Bandwidth = f
2, the maximum center
LTC1264
1264 TA02
CENTER
1M
/10
1

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LTC1264CS Summary of contents

Page 1

... Customized Version with Internal Resistors Available Low Noise Low Harmonic Distortion O U PPLICATI A S Digital Communications Spread Spectrum Communications Spectral Analysis Loran Receivers Instrumentation , LTC and LT are registered trademarks of Linear Technology Corporation TYPICAL A PPLICATI Clock-Tunable 8th Order Bandpass Filter, f 50k 50k IN INV B 10k HPB/NB ...

Page 2

... < 2MHz CLK f < 2MHz CLK U W ORDER PART TOP VIEW NUMBER 1 24 INV HPC/ BPC LTC1264CN 4 LPC 21 LTC1264CS – CLK LPD BPD 11 14 HPD/ INV D S PACKAGE 24-LEAD PLASTIC SOL ...

Page 3

ELECTRICAL C HARA TERISTICS C (Complete Filter 5V 1MHz, all sides mode CLK PARAMETER DC Offset Voltage (Note 2) Clock Feedthrough Maximum Clock Frequency Power Supply Current The denotes specifications which apply over ...

Page 4

LTC1264 W U TYPICAL PERFOR A Typical Bandpass Gain Error vs Clock Frequency 5 MODE 25° ± ±7. 2.0 2.4 2.8 3.2 ...

Page 5

CTIO S + – (Pins 7, 19): Power Supply Pins. The V – the V (Pin 19) should each be bypassed with a 0.1 F capacitor to an adequate analog ground. The ...

Page 6

LTC1264 CTIO S CLK (Pin 18): Clock Input Pin. Any TTL or CMOS clock source with a square wave output and 50% duty cycle ( 10 adequate clock source for the device. The ...

Page 7

W ODES OF OPERATIO optimum mode for high Q designs with ratios greater than 20:1. CENTER Please refer to the Maximum Frequency of Operation paragraph under Applications Information for a guide to the use of capacitor C ...

Page 8

LTC1264 W ODES OF OPERATIO – V – 1/4 LTC1264 AGND f R2 CLK ...

Page 9

W ODES OF OPERATIO – AGND Figure 9. Mode 2n, 2nd Order Filter Providing a Lowpass Notch Output W BLOCK I D AGRA INV A 12 AGND 6 INV B 1 INV C ...

Page 10

LTC1264 PPLICATI S I FOR ATIO A Operating Limits The Typical Maximum Q vs Clock Frequency and Band- pass Gain Error graphs, under Typical Performance Char- acteristics, define an upper limit of operating Q for each LTC1264 ...

Page 11

PPLICATI S I FOR ATIO For example, for an LTC1264 bandpass filter with f = 100kHz and f = 2MHz, a 3.9MHz, 10mV input will CLK produce a 100kHz, 10mV output. A 1st or 2nd order ...

Page 12

LTC1264 PPLICATI S I FOR ATIO INV B INV C R2 HPB/NB HPC/NC R3 STAGE 1 BPB BPC LPB LPC LTC1264 – AGND CLK SA ...

Page 13

O TYPICAL A PPLICATI Linear Phase Clock-Tunable to 400kHz, Dual 4th Order Lowpass Filter INV B R2 HPB/NB R3 BPB R4 LPB C SB LTC1264 0.1 F AGND + LPA R3 BPA ...

Page 14

LTC1264 O TYPICAL A PPLICATI 100kHz, 8th Order Notch Filter INV B INV C R2 HPB/NB HPC/NC R3 BPB BPC LPB LPC SB SC 0.1 F LTC1264 AGND V + 7.5V V CLK SA SD LPA ...

Page 15

... DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 16

... Passband Gain and Group Delay 3 124 0 114 GAIN –3 104 –6 94 –9 84 DELAY FREQUENCY (kHz) 1264 TA07c Noise per 2nd Order Section, Operation 3. RMS 1264fa LT/TP 0198 4K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1993 ...

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