LTC222 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC222
Linear Technology
LTC222 Datasheet PDF : 12 Pages
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LTC221/LTC222
APPLICATIO S I FOR ATIO
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
state output switch on. Feedthrough via gate capacitance
may result in spikes at leading and trailing edge of output
waveform.
LTC222
LOGIC INPUT 3V
tr < 20ns
tr < 20ns OV
LTC221
LOGIC INPUT 3V
tr < 20ns
tr < 20ns OV
SWITCH
INPUT
VS
SWITCH
OUTPUT
OV
LOGIC "1" = SW ON
50%
LOGIC "0" = SW ON
50%
Switching Time Test Circuit
SWITCH
INPUT S1
VS = 2V
IN1
LOGIC
INPUT
VO 0.9
tON
VO 0.9
tOFF
LTC221/222 • AI01
SWITCH
D1
OUTPUT
VO
RL
1k
CL
35pF
VO
=
VS
RL+
RL
RDS(ON)
(REPEAT TEST FOR IN2, IN3 AND IN4)
LTC221/222 • AI02
RGEN
SX
VGEN
DX
INX
Charge Injection Test Circuit
VO
CL = 1000pF
∆VO
VO
LTC221/222 • AI03
3V
LTC221 INX
ON
OFF
ON
OV
3V ON
ON
LTC222 INX
OFF
OV
∆VO IS THE MEASURED VOLTAGE ERROR DUE TO CHARGE INJECTION.
THE ERROR VOLTAGE IN COULOMBS IS ∆Q = VL • ∆VO
LTC221/222 • AI04
OIRR-Off Isolation Test Circuit
C 15V
SIGNAL
GENERATOR
VS V+
VS = 2VP-P
f = 100kHz
CHAN A
INX
VIN
ANALYZER
CHAN B
VD
RL
GND
V–
1k
C = 0.001µF//0.1µF
CHIP CAPACITORS
OIRR = 20 LOG
VS
VD
C
–15V
LTC221/222 • AI05
CCRR-Channel to Channel Crosstalk Test Circuit
C 15V
SIGNAL
GENERATOR
VS = 2Vp-p
f = 100kHz
CHAN A
ANALYZER
VIN
CHAN B
RL
1k
VS1 V+
VL VD1
50Ω
IN1
IN2
VIN
VD2
VS2
GND
V–
NC
C = 0.001µF//0.1µF
CHIP CAPACITORS
OIRR = 20 LOG
VS1
VD2
C
–15V
LTC221/222 • AI06
2212fa
5
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