LM134 Series
U
TYPICAL APPLICATIO S
Higher Output Current
Low Input Voltage Reference Driver
Low Output Impedance Thermometer
V
IN
≥ V
REF
+ 200mV
V
V
IN
IN
R1
1.5k
R1
15k
R2
300Ω
2N2905
R1*
C1
0.1
Q1
2N4250
2N4250
+
+
V
V
= V + 64mV AT 25°C
V
OUT
Z
C1*
+
V
V
+
Z
–
I
≤ 3mA
OUT
LT1009
V
Z
= 10mV/°K
≤ 2Ω
OUT
OUT
V
R
R
C1
0.0022
R
LM334
R3
100Ω
R
SET
–
–
R2
120Ω
LM334
V
LM334
V
–
R4
4.5k
–V
TA05
IN
TA07
*SELECT R1 AND C1 FOR OPTIMUM STABILITY
TA06
Micropower Bias
Zener Biasing
1.2V Regulator with 1.8V Minimum Input
V
≥ 1.8V
IN
V
IN
100k
V
IN
2N4250
V
C1
0.001
+
V
R1
33k
= 1.2V
≤ 200µA
LM4250
OUT
I
OUT
R
LM334
1N457**
1µA
+
R
SET
+
R1*
≈6k
1%
V
–
V
V
R
SET
V
OUT
68k
R
R
LM134**
LM334
V
Z
R2*
680Ω
1%
–
–
V
V
TA10
TA09
TA08
*
SELECT RATIO OF R1 TO R2 FOR ZERO TEMPERATURE DRIFT
LM134 AND DIODE SHOULD BE ISOTHERMAL
–V
IN
**
Buffer for Photoconductive Cell
Alternate Trimming Technique
High Precision Low TC Current Source
+
I
≥ 50µA
SET
V
IN
+
V
+
–
V
R
LM334
+
R
V
LM334
–
V
R
R
SET
1.5V
V
LM334
R1*
R1
6.8k
LT1004-1.2
(1.235V)
–
R2*
V
TA11
TA12
TA13
–V
IN
–
*FOR ±10% ADJUSTMENT, SELECT R
10% HIGH AND MAKE R1 ≈ 3R
1.37V
R2
SET
*I
=
+ 10µA
SET
SET
I
TC = 0.016%/°C + 33nA/°C
SET
REGULATION ≈ 0.001%/V
8
Linear [ Linear ]
