ltz1000a Linear Technology Corporation, ltz1000a Datasheet - Page 3

• Manufacturer Part Number: ltz1000a
• Description: Ultra Precision Reference
• Manufacturer: Linear Technology Corporation

PIN FUNCTIONS
TYPICAL PERFORMANCE CHARACTERISTICS
Pin 1: Heater Positive. Must have a higher positive value
than Pin 2 and Pin 4.
Pin 2: Heater Negative. Must have a higher positive value
than Pin 4. Must have equal or lower potential than Pin 1.
Pin 3: Zener Positive. Must have a higher positive value
than Pin 4.
Pin 4: Substrate and Zener Negative. Must have a higher
positive value than Pin 7. If Q1 is zenered (about 7V) a
permanent degradation in beta will result.
100
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
90
80
70
60
50
40
30
20
10
0
0
25
0
Zener Voltage vs Current
Die Temperature Rise
vs Heater Power
DIE TEMPERATURE ABOVE AMBIENT (°C)
0.5
35
1.0
45
ZENER CURRENT (mA)
1.5
55
2.0
65
LTZ1000A
LTZ1000
ZENER ALONE
2.5
75
ZENER WITH KELVIN
SENSED Q1
3.0 3.5
85
95
105
4.0
1000 G01
1000 G04
4.5
115
125
5.0
500
450
400
350
300
250
200
150
100
125
100
50
75
50
25
0
0
0.1
0.1
Die Temperature vs Time
Zener Voltage Noise Spectrum
LTZ1000A
HEATER POWER = 0.3W
1
HEATER POWER = 0.1W
1
FREQUENCY (Hz)
TIME (SECONDS)
HEATER POWER = 0.2W
ZENER CURRENT = 0.5mA
ZENER CURRENT = 4mA
10
Pin 5: Temperature Compensating Transistor Collector.
Pin 6: Temperature Sensing Transistor Base. If the base
emitter junction is zenered (about 7V) the transistor will
suffer permanent beta degradation.
Pin 7: Emitter of Sensing and Compensating Transistors.
Pin 8: Collector of Sensing Transistor.
10
100
1000 G05
1000 G02
1000
100
LTZ1000/LTZ1000A
125
100
75
50
25
0
0.1
Die Temperature Rise vs Time
0
Zener Noise
LTZ1000
HEATER POWER = 0.5W
HEATER POWER = 0.7W
10
1
20
TIME (SECONDS)
TIME (SECONDS)
I
Z
I
Z
= 0.5mA
= 4mA
10
HEATER POWER = 0.3W
30
40
100
1000 G06
50
1000 G03
1000afc
3
1000
60