SCI7661 Series
2–14
EPSON
SCI7000 Series
Technical Manual
Simultaneous Voltage Conversion
Combining a standard voltage tripler circuit with one
for positive voltage conversion generates both –15 and
8.2V outputs from a single input, however, it also raises
the output impedance.
A voltage doubler generates –10 and 3.8V outputs.
Potential levels
V
DD
= 0 V
V
I
= –5 V
V
O1
= –15 V
V
O2
= 8.2V
V
DD
= 0 V
V
I
= –5 V
V
O2
= 8.2 V
V
O1
= –15 V
+
+
10
µ
F
10
µ
F
10
µ
F
10
µ
F
10
µ
F
10
µ
F
+
ROSC
1 M
Ω
D1
D2
5 V
D3
+
+
+
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Using an External Gradient
The SCI7661C
0B
/M
0B
offers three built-in temperature
gradients— –0.1, –0.4 and –0.6%/
°
C.
To set the gradient externally, place a thermistor, R
T
, in
series with the variable resistor, R
RV
, used to adjust the
output voltage.
R
T
V
REG
R
RV
R1
10
µ
F
V
DD
R
P
+
1
2
3
4
5
6
7
14
13
12
11
10
9
8
