LTC222CJ datasheet(5/12 Pages) LINER

Part #	LTC222CJ

Description	Micropower, Low Charge Injection, Quad CMOS Analog Switches with Data Latches

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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5 / 12 page

LTC221/LTC222

5

2212fa

Switching Time Test Circuit

Switch output waveform shown for VS = constant with

logic input waveform as shown. Note that VS may be (+)

or (–) as per switching time test circuit. VO is the steady

APPLICATIO S I FOR ATIO

state output switch on. Feedthrough via gate capacitance

may result in spikes at leading and trailing edge of output

waveform.

CCRR-Channel to Channel Crosstalk Test Circuit

Switching Time Test Circuit

Charge Injection Test Circuit

OIRR-Off Isolation Test Circuit

LTC221/222 • AI01

VS

OV

3V

LTC222

LOGIC INPUT

tr < 20ns

LTC221

LOGIC INPUT

tr < 20ns

SWITCH

INPUT

SWITCH

OUTPUT

50%

VO

0.9

LOGIC "0" = SW ON

LOGIC "1" = SW ON

VO

tON

tOFF

LTC221/222 • AI02

S1

D1

(REPEAT TEST FOR IN2, IN3 AND IN4)

VO

CL

35pF

RL

1k

RL

RL+ RDS(ON)

VO = VS

IN1

SWITCH

OUTPUT

SWITCH

INPUT

LOGIC

INPUT

VS = 2V

LTC221/222 • AI03

SX

RGEN

VGEN

DX

INX

VO

CL = 1000pF

LTC221/222 • AI04

OV

3V

VO

LTC221 INX

LTC222 INX

∆VO

∆VO IS THE MEASURED VOLTAGE ERROR DUE TO CHARGE INJECTION.

THE ERROR VOLTAGE IN COULOMBS IS ∆Q = VL • ∆VO

OFF

ON

LTC221/222 • AI05

VS V+

V–

C

OIRR = 20 LOG

C = 0.001µF//0.1µF

CHIP CAPACITORS

SIGNAL

GENERATOR

C

15V

–15V

VD

GND

VIN

INX

VS

VD

RL

1k

VS = 2VP-P

f = 100kHz

CHAN A

ANALYZER

CHAN B

LTC221/222 • AI06

VS1 V

+

V–

C

OIRR = 20 LOG

C = 0.001µF//0.1µF

CHIP CAPACITORS

SIGNAL

GENERATOR

C

NC

50Ω

15V

–15V

VD2

VS2

VD1

VL

GND

VIN

IN2

IN1

VS1

VD2

RL

1k

VS = 2Vp-p

f = 100kHz

CHAN A

ANALYZER

CHAN B

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