Datasheet

LT1720/LT1721
7
17201fc
TEST CIRCUITS
+
–
+
–
+
–
–
+
DUT
1/2 LT1720 OR
1/4 LT1721
15V
P-P
BANDWIDTH-LIMITED
TRIANGLE WAVE
~1kHz
LTC203
1/2 LT1112
50Ω
100k
100k
2.4k
10nF
1μF
0.15μF
1/2 LT1638
1/2 LT1638
100k
100k
200k
10k
10k
1000 s V
HYST
1000 s V
TRIP
+
1000 s V
TRIP
–
1000 s V
OS
0.1μF
50Ω
50k
V
CM
V
CC
+
–
1/2 LT1112
17201 TC01
10nF
1μF
NOTES: LT1638, LT1112, LTC203s ARE POWERED FROM p15V.
200kW PULL-DOWN PROTECTS LTC203 LOGIC INPUTS
WHEN DUT IS NOT POWERED
15 3 214
16
9
1
8
10 6 711
LTC203
2 14 153
1
8
16
9
7 11 106
±V
TRIP
Test Circuit
Response Time Test Circuit
–
+
–3V
–100mV
–5V
PULSE
IN
0V
0V
50Ω
1N5711
400Ω
130Ω
25Ω
50Ω
+V
CC
– V
CM
–V
CM
50k
DUT
1/2 LT1720 OR
1/4 LT1721
25Ω
0.1μF
17201 TC02
10 s SCOPE PROBE
(C
IN
≈ 10pF)
0.01μF
0.01μF
750Ω
2N3866
V1*
*V1 = –1000 • (OVERDRIVE  V
TRIP
+
)
NOTE: RISING EDGE TEST SHOWN.
FOR FALLING EDGE, REVERSE LT1720 INPUTS