LTZ1000/LTZ1000A
Typical applicaTions
Averaging Reference Voltage for Lower Noise and Better Stability
Improving Supply Rejection
V
15V
1.5k
IN
0.01%
SUPPLY REJECTION
V
IN
15V
V
OUT1
AT V
= 20mV/V
OUT1
1.6k
1.6k
50Ω
SUPPLY REJECTION AT
V = 3mV/V
OUT2
V
OUT2
30Ω*
30Ω*
150Ω
OUTPUT
I
C
1000 TA04
150Ω
150Ω
*R =
1000 TA03
kT
q I
C
Adjusting Temperature Coefficient in Unstabilized Applications
15V
1 MIN
V
+
OUT
*
ON OFF
1 MIN
R1
200Ω*
70k
1N4148
1
2
3
2
3
+
–
5
6
LT1006
HEATER
1N4148
4
4
7
120Ω
0.022µF
* PULSE HEATER ON AND OFF TO HEAT AND COOL THE REFERENCE. ADJUST
R1 FOR MINIMUM VOLTAGE CHANGE THROUGH A TEMPERATURE CYCLE.
1000 TA05
THE –2mV/°C TEMPCO OF THE V CANCELS THE +2mV/°C TEMPCO OF THE ZENER.
BE
7V Positive Reference Circuit
ZENER + SENSE
+
V
15V
R4
13k
R3
R2
3
4
70k
70k
1N4148
8
5
3
2
+
–
+
1k
7
A1
LT1013
A2
LT1013
1
8
5
2N3904
10k
6
–
4
7
1M
0.1µF
ZENER – SENSE
400k*
0.1µF
1
2
R5
1k
R1
120Ω
0.002µF
GROUND
ZENER – FORCE
1N4148
HEATER RETURN
(TIED TO GROUND)
*PROVIDES TC COMPENSATION, DELETE FOR LTZ1000A
APPROXIMATE CHANGE IN REFERENCE VOLTAGE FOR A 100ppm (0.01%) CHANGE IN RESISTOR VALUES:
∆R(Ω)
0.012Ω
7Ω
∆V
Z
1ppm
0.3ppm
0.2ppm
1ppm
R1
R2
7Ω
R3
∆R = 0.01%
R4/R5 RATIO
BOTH A1 AND A2 CONTRIBUTE LESS THAN 2µV OF OUTPUT DRIFT OVER A 50°C RANGE
1000 TA06
1000afd
6
Linear [ Linear ]
