1719 데이터 시트보기 (PDF) - Linear Technology
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1719 Datasheet PDF : 16 Pages
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LT1719
TEST CIRCUITS
±VTRIP Test Circuit
BANDWIDTH-LIMITED TRIANGLE WAVE
~ 1kHz, VCM ±7.5V
VCC 0.1µF
50k
+
50Ω
50Ω
DUT
LT1719
–
200k
VCM
LTC203
14
15
3
2
10nF
16
1
9
8
11
10
6
7
LTC203
1000 × VTRIP+
1µF
10k
1/2 LT1112
–+
1000 × VHYST
1000 × VOS
10k
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
2
14
15
10nF
1µF
16
9
7
11
10
1719 TC01
1/2 LT1112
–+
1000 × VTRIP–
APPLICATIONS INFORMATION
Power Supply Configurations
The LT1719 has separate supply pins for the input and
output stages that allow flexible operation, accommodat-
ing separate voltage ranges for the analog input and the
output logic. Of course, a single 3V/5V supply may be used
by tying + VS and VCC together as well as GND and VEE.
The minimum voltage requirement can be simply stated as
both the output and the input stages need at least 2.7V and
the VEE pin must be equal to or less than ground.
The following rules must be adhered to in any
configuration:
2.7V ≤ (VCC – VEE) ≤ 10.5V
2.7V ≤ (+ VS – GND) ≤ 6V
(+ VS – VEE) ≤ 10.5V
VEE ≤ Ground
Although the ground pin need not be tied to system
ground, most applications will use it that way. Figure 1
shows three common configurations. The final one is
uncommon, but it will work and may be useful as a level
translator; the input stage is run from – 5.2V and ground
while the output stage is run from 3V and ground. In this
case the common mode input voltage range does not
include ground, so it may be helpful to tie VCC to 3V
anyway. Conversely, VCC may also be tied below ground,
as long as the above rules are not violated.
Input Voltage Considerations
The LT1719 is specified for a common mode range of
–100mV to 3.8V when used with a single 5V supply. A
more general consideration is that the common mode
range is 100mV below VEE to 1.2V below VCC. The criterion
for this common mode limit is that the output still
6
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