LTC1264CN Linear Technology, LTC1264CN Datasheet

IC FILTR BUILDNG BLK HISPD 24DIP

LTC1264CN

Manufacturer Part Number
LTC1264CN
Description
IC FILTR BUILDNG BLK HISPD 24DIP
Manufacturer
Linear Technology
Datasheet

Specifications of LTC1264CN

Filter Type
Universal Switched Capacitor
Frequency - Cutoff Or Center
250kHz
Number Of Filters
4
Max-order
2nd
Voltage - Supply
±2.37 V ~ 8 V
Mounting Type
Through Hole
Package / Case
24-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1264CN
Manufacturer:
NS
Quantity:
30
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
All other trademarks are the property of their respective owners.
MAXIMUM
f
160kHz
120kHz
CENTER
60kHz
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
Available in 24-Pin DIP and SO Wide Packages
Digital Communications
Spread Spectrum Communications
Spectral Analysis
Loran Receivers
Instrumentation
, LTC and LT are registered trademarks of Linear Technology Corporation.
IN
Clock-Tunable 8th Order Bandpass Filter, f
50k
Single 5V
SUPPLY
POWER
±7.5V
±5V
50k
10k
10k
50k
50k
U
0.1µF
INV B
HPB/NB
BPB
LPB
SB
AGND
V
SA
LPA
BPA
HPA/NA
INV A
+
LTC1264
50k
50k
U
HPD/ND
HPC/NC
INV D
INV C
BPD
BPC
LPC
CLK
LPD
SD
SC
V
CENTER
f
CLK
10k
50k
50k
10k
= f
0.1µF
CLK
/20
1264 TA01
OUT
High Speed, Quad Universal
DESCRIPTIO
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 ≤ 5 and for T
frequency is 160kHz. For Q ≤ 2, the maximum center
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.
®
1264 consists of four identical, high speed 2nd
100kHz Bandpass, f
–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
LTC1264
1264 TA02
CENTER
1M
/10
1264fb
1

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LTC1264CN Summary of contents

Page 1

... Digital Communications ■ Spread Spectrum Communications ■ Spectral Analysis ■ Loran Receivers ■ Instrumentation , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. U TYPICAL APPLICATIO Clock-Tunable 8th Order Bandpass Filter, f 50k 50k IN INV B ...

Page 2

... V S ≥ ± ± < 2MHz CLK f < 2MHz CLK U W TOP VIEW ORDER PART 1 24 INV C NUMBER 2 23 HPC/ BPC 4 21 LPC LTC1264CN LTC1264CSW – CLK LPD 10 15 BPD 11 14 HPD/ INV D SW PACKAGE 24-LEAD PLASTIC SO (WIDE) = 110°C, θ = 65°C/W (N) ...

Page 3

ELECTRICAL C HARA TERISTICS C temperature range, otherwise specifications are unless otherwise noted. PARAMETER DC Offset Voltage (Note 3) Clock Feedthrough Maximum Clock Frequency Power Supply Current Note 1: Absolute Maximum Ratings are those values ...

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 0.1µF capacitor to an adequate analog ground. The filter’s ...

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 power ...

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 – Σ + 1/4 LTC1264 AGND √ 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 A 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 U 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 0.1µF AGND + LPA R3 ...

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 0.1µF LTC1264 AGND V + 7.5V V CLK SA SD LPA LPD ...

Page 15

... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) 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

... TA07a 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 3.3V to ±5V RMS LT/LT 0805 REV B • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1993 1264fb ...

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