LTC1068-200IG#TRPBF datasheet, PDF

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LTC1068-200IG#TRPBF: DescriptionActive Filter Quad SW-CAP UNIV 8th Order 25kHz 28-Pin SSOP T/R; CategoryActive filter; File Size368KB，30 Pages; ManufacturerADI; Websitehttps://www.analog.com

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LTC1068-200IG#TRPBF Overview

Active Filter Quad SW-CAP UNIV 8th Order 25kHz 28-Pin SSOP T/R

LTC1068-200IG#TRPBF Parametric

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Compliant
ECCN (US)	EAR99
Part Status	Active
HTS	8542.39.00.01
Type	Universal
Architecture	Switched Capacitor
Maximum Order	8th
Number of Circuits	4
Cut-Off Frequency Range	<100kHz
Cut-Off Frequency	25kHz
Minimum Single Supply Voltage (V)	3.14
Maximum Single Supply Voltage (V)	11
Typical Single Supply Voltage (V)	3.3\|5
Minimum Dual Supply Voltage (V)	±1.57
Maximum Dual Supply Voltage (V)	±5.5
Typical Dual Supply Voltage (V)	±5
Power Supply Type	Single\|Dual
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	85
Packaging	Tape and Reel
Standard Package Name	SOP
Pin Count	28
Supplier Package	SSOP
Mounting	Surface Mount
Package Height	2(Max) - 0.05(Min)
Package Length	10.5(Max)
Package Width	5.6(Max)
PCB changed	28
Lead Shape	Gull-wing

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LTC1068 Series

Clock-Tunable, Quad

Second Order, Filter Building Blocks

FEATURES

DESCRIPTION

The LTC

1068 product family consists of four monolithic

clock-tunable filter building blocks. Each product contains

four matched, low noise, high accuracy 2nd order switched-

capacitor filter sections. An external clock tunes the center

frequency of each 2nd order filter section. The LTC1068

products differ only in their clock-to-center frequency

ratio. The clock-to-center frequency ratio is set to 200:1

(LTC1068-200), 100:1 (LTC1068), 50:1 (LTC1068-50) or

25:1 (LTC1068-25). External resistors can modify the clock-

to-center frequency ratio. High performance, quad 2nd

order, dual 4th order or 8th order filters can be designed

with an LTC1068 family product. Designing filters with an

LTC1068 product is fully supported by FilterCAD™ filter

design software for Windows.

The LTC1068 products are available in a 28-pin SSOP

surface mount package. A customized version of an

LTC1068 family product can be obtained in a 16-lead SO

package with internal thin-film resistors. Please contact

LTC Marketing for details.

LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

FilterCAD is a trademark of Linear Technology Corporation. All other trademarks are the property

of their respective owners.

Four Identical 2nd Order Filter Sections in an

SSOP Package

2nd Order Section Center Frequency Error:

± 0.3% Typical and ±0.8% Maximum

Low Noise per 2nd Order Section, Q ≤ 5:

LTC1068-200 50µV

RMS

, LTC1068 50µV

RMS

LTC1068-50 75µV

RMS

, LTC1068-25 90µV

RMS

Low Power Supply Current: 4.5mA, Single 5V,

LTC1068-50

Operation with ± 5V Power Supply, Single 5V

Supply or Single 3.3V Supply

APPLICATIONS

Lowpass or Highpass Filters:

LTC1068-200, 0.5Hz to 25kHz; LTC1068, 1Hz to

50kHz; LTC1068-50, 2Hz to 50kHz; LTC1068-25,

4Hz to 200kHz

Bandpass or Bandreject (Notch) Filters:

LTC1068-200, 0.5Hz to 15kHz; LTC1068, 1Hz to

30kHz; LTC1068-50, 2Hz to 30kHz; LTC1068-25,

4Hz to 140kHz

TYPICAL APPLICATION

Dual, Matched, 4th Order Butterworth Lowpass Filters, Clock-Tunable Up

to 200kHz f – 3dB = f

CLK

/25, 4th Order Filter Noise = 60µV

RMS

R12 14k

IN1

R11 20k

R21 14k

R31 20k

0.1µF

R33 20k

R23 14k

IN2

R13 20k

INV B

HPB/NB

BPB

LPB

LTC1068-25

INV C

HPC/NC

BPC

LPC

–

CLK

LPD

BPD

HPD/ND

INVD

R14 14k

1068 TA01

Gain vs Frequency

R22 20k

R32 10k

OUT1

GAIN (dB)

–10

–20

AGND

LPA

BPA

HPA/NA

INVA

1µF

–5V

–30

–40

–50

–60

–70

CLK

= (25)(f – 3dB)

R34 10k

R24 20k

OUT2

–80

0.1

RELATIVE FREQUENCY [f

/(f – 3dB)]

1068 TA02

1068fc

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