LTC1068IG-50 datasheet, PDF - EEWORLD Datasheet

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LTC1068IG-50: DescriptionClock-Tunable, Quad Second Order, Filter Building Blocks; CategoryAnalog mixed-signal IC filter; File Size393KB，28 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC1068IG-50 Overview

Clock-Tunable, Quad Second Order, Filter Building Blocks

LTC1068IG-50 Parametric

Parameter Name	Attribute value
Is it lead-free?	Contains lead
Is it Rohs certified?	incompatible
Maker	Linear ( ADI )
Parts packaging code	SSOP
package instruction	SSOP, SSOP28,.3
Contacts	28
Reach Compliance Code	compli
ECCN code	EAR99
Active filter type	SWITCHED CAPACITOR FILTER
Center frequency or cutoff frequency maximum range	50 kHz
Center frequency or cutoff frequency minimum range	0.002 kHz
JESD-30 code	R-PDSO-G28
JESD-609 code	e0
length	10.2 mm
Humidity sensitivity level	1
Maximum negative supply voltage (Vsup)	-5.5 V
Nominal Negative Supply Voltage (Vsup)	-5 V
Number of functions	4
Number of terminals	28
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Order	2ND
Package body material	PLASTIC/EPOXY
encapsulated code	SSOP
Encapsulate equivalent code	SSOP28,.3
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	255
poles and zeros	2 AND 0
power supply	+-1.57/+-5 V
Certification status	Not Qualified
response	UNIVERSAL
Maximum seat height	2 mm
Maximum supply current (Isup)	11 mA
Maximum supply voltage (Vsup)	5.5 V
Nominal supply voltage (Vsup)	5 V
surface mount	YES
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	0.65 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	40
transfer characteristics	RESISTOR PROGRAMMABLE
width	5.3 mm

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LTC1068 Series

Clock-Tunable, Quad

Second Order, Filter Building Blocks

FEATURES

DESCRIPTIO

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

≤

LTC1068-200 50

RMS

, LTC1068 50

RMS

LTC1068-50 75

RMS

, LTC1068-25 90

RMS

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

LTC1068-50

Operation with

±5V

Power Supply, Single 5V

Supply or Single 3.3V Supply

APPLICATI

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

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.

, LTC and LT are registered trademarks of Linear Technology Corporation.

FilterCAD is a trademark of Linear Technology Corporation.

Windows is a registered trademark of Microsoft Corporation.

TYPICAL APPLICATI

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

R11 20k

IN1

R21 14k

R31 20k

0.1µF

R33 20k

R23 14k

R13 20k

IN2

INV B

HPB/NB

BPB

LPB

LTC1068-25

AGND

LPA

BPA

HPA/NA

INVA

INV C

HPC/NC

BPC

LPC

–

R14 14k

1068 TA20a

R22 20k

R32 10k

OUT1

–10

– 5V

– 20

GAIN (dB)

1µF

CLK

= (25)(f – 3dB)

CLK

LPD

BPD

HPD/ND

INVD

– 30

– 40

– 50

– 60

OUT2

R34 10k

R24 20k

– 70

– 80

0.1

RELATIVE FREQUENCY [f

/(f – 3dB)]

Gain vs Frequency

1068 TA20b

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