LT1031/LH0070
U
APPLICATIO CIRCUITS
Precision DAC Reference with System TC Trim
LT1031
IN
OUT
15V
8.87k
1%
GND
50k
ROOM TEMP
TRIM
D1
IN457
10k
1%
10.36k
1%
50k
TC TRIM*
1.24k
1%
10k
1%
200k
1%
D2
IN457
50k
8.45k
1mA
*TRIMS 1mA REFERENCE CURRENT
TC BY ± 40ppm/°C. THIS TRIM
DAC
SCHEME HAS VERY LITTLE EFFECT ON ROOM
TEMPERATURE CURRENT TO MINIMIZE ITERATIVE
TRIMMING.
LT1031 • AC09
U
W
EQUIVALENT SCHEMATIC
INPUT
Q3
D1
D2
OUTPUT
R1
D3
Q1
–
+
A1
R2
D4
6.3V
Q2
GND
LT1031 • ES01
1031fb
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
Linear [ Linear ]
