1720 Просмотр технического описания (PDF) - Linear Technology
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1720 Datasheet PDF : 28 Pages
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LT1720/LT1721
TEST CIRCUITS
15VP-P
BANDWIDTH-LIMITED
TRIANGLE WAVE
~ 1kHz
VCC
0.1µF
50k
+
50Ω
50Ω
–
200k
DUT
1/2 LT1720 OR
VCM
1/4 LT1721
±VTRIP Test Circuit
LTC203
14
15
3
2
10nF
16
1
9
8
11
10
6
7
1000 × VTRIP+
1µF
10k
1/2 LT1112
–+
1000 × VHYST
LTC203
1/2 LT1638
+
100k
100k
–
100k
+
2.4k
–
100k
1/2 LT1638
3
1
8
0.15µF
6
NOTES: LT1638, LT1112, LTC203s ARE POWERED FROM ±15V.
200kΩ PULL-DOWN PROTECTS LTC203 LOGIC INPUTS
WHEN DUT IS NOT POWERED
1000 × VOS
10k
2
14
15
10nF
1µF
16
9
7
11
10
1720/21 TC01
1/2 LT1112
–+
1000 × VTRIP–
Response Time Test Circuit
0V
0.1µF
130Ω
–100mV
DUT
1/2 LT1720 OR
1/4 LT1721
25Ω
25Ω
50k
V1* 50Ω
+VCC – VCM
+
0.01µF
–
0.01µF
10 × SCOPE PROBE
(CIN ≈ 10pF)
PULSE
2N3866
0V
IN
1N5711
–3V
–VCM
50Ω
400Ω 750Ω
*V1 = –1000 • (OVERDRIVE + VTRIP+)
NOTE: RISING EDGE TEST SHOWN.
– 5V
FOR FALLING EDGE, REVERSE LT1720 INPUTS
1720/21 TC02
6
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