LT1236 LINER [Linear Technology], LT1236 Datasheet

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LT1236

Manufacturer Part Number
LT1236
Description
Precision Reference
Manufacturer
LINER [Linear Technology]
Datasheet

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FEATURE
A
TYPICAL
PPLICATI
Ultra-Low Drift: 5ppm/ C Max
Trimmed to High Accuracy: 0.05% Max
Industrial Temperature Range SO Package
Operates in Series or Shunt Mode
Pin Compatible with AD586, AD587
Output Sinks and Sources in Series Mode
Very Low Noise < 1ppm
100% Noise Tested
> 100dB Ripple Rejection
Minimum Input/Output Differential of 1V
A/D and D/A Converters
Precision Regulators
Precision Scales
Inertial Navigation Systems
Digital Voltmeters
V
IN
IN
Basic Positive and Negative Connections
LT1236
GND
A
S
OUT
O
PPLICATI
U
S
V
OUT
P-P
R1 =
O
(0.1Hz to 10Hz)
I
LOAD
V
NC
OUT
U
+ 1.5mA
– (V
IN
LT1236-10
)
–15V
GND
(V
)
R1
OUT
–V
LT1236 TA01
OUT
The LT
low drift and noise with excellent long-term stability and
high output accuracy. The reference output will both
source and sink up to 10mA and is almost totally immune
to input voltage variations. Two voltages are available: 5V
and 10V. The 10V version can be used as a shunt regulator
(two-terminal zener) with the same precision characteris-
tics as the three-terminal connection. Special care has
been taken to minimize thermal regulation effects and
temperature induced hysteresis.
The LT1236 combines both superior accuracy and tem-
perature coefficient specifications without the use of high
power, on-chip heaters. The LT1236 references are based
on a buried zener diode structure which eliminates noise
and stability problems with surface breakdown devices.
Further, a subsurface zener exhibits better temperature
drift and time stability than even the best band-gap
references.
D
, LTC and LT are registered trademarks of Linear Technology Corporation.
ESCRIPTIO
®
1236 is a precision reference that combines ultra-
Typical Distribution of Temperature Drift
24
22
20
18
16
14
12
10
8
6
4
2
0
–3
DISTRIBUTION
OF THREE RUNS
–2
Precision Reference
U
OUTPUT DRIFT (ppm/ C)
–1
0
1
2
LT1236 TA02
3
LT1236
1

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LT1236 Summary of contents

Page 1

... Special care has been taken to minimize thermal regulation effects and temperature induced hysteresis. The LT1236 combines both superior accuracy and tem- perature coefficient specifications without the use of high power, on-chip heaters. The LT1236 references are based on a buried zener diode structure which eliminates noise and stability problems with surface breakdown devices ...

Page 2

... G S Output Short-Circuit Duration V = 35V ......................................................... 10 sec IN V 20V ................................................... Indefinite IN Operating Temperature Range LT1236AC, BC, CC .................................. LT1236AI, BI, CI ................................ – Storage Temperature Range ................ – 150 C OUT Lead Temperature (Soldering, 10 sec)................ 300 ORDER PART NUMBER TOP VIEW LT1236ACN8-5 LT1236BCN8-5 ...

Page 3

... Total drift in the second thousand hours is normally less than one third that of the first thousand hours, with a continuing trend toward reduced drift with time. Significant improvement in long-term drift can be LT1236 LT1236-5 MIN TYP ...

Page 4

... C HARA TERISTICS C CE Ripple Rejection 130 V = 15V OUT 120 110 LT1236-10 100 90 80 LT1236 100 1k FREQUENCY (Hz) Start-Up (Shunt Mode), LT1236-10 11 LT1236- OUT 0V 8 OUT IN NC GND TIME ( unless otherwise noted. A Minimum Input/Output Differential, LT1236-10 1 ...

Page 5

... SINK SOURCE I = 2-10mA SINK I = 2-10mA SOURCE I = 100 100 A SOURCE P-P SINK TIME ( s) Load Regulation LT1236 – 1 – 2 – 3 – 4 – 100 –10 – 8 – 6 – – 2 SOURCING OUTPUT CURRENT (mA) ...

Page 6

... I SOURCE SINK I = 2-10mA SOURCE I = 2-10mA SINK I = 100 100 A SOURCE P-P SINK TIME ( s) NOTE VERTICAL SCALE CHANGE BETWEEN SOURCING AND SINKING Input Supply Current, LT1236-10 1 OUT T = – 1 125 C J 1.0 0.8 0.6 0.4 0 ...

Page 7

... Effect on the output TC will be only 1ppm/ C for the 5mV trim needed to set the “A” device to 10.000V. LT1236-5 The LT1236-5 does have an output voltage trim pin, but the TC of the nominal 4V open circuit voltage at pin 5 is about –1.7mV/ C. For the voltage trimming not to affect reference output TC, the external trim voltage must track the voltage on the trim pin ...

Page 8

... In series mode operation, the ground pin of the LT1236 carries only 1mA and can be used as a sense line, greatly reducing ground loop and loss problems on the low side of the reference. The high side supplies load current so line resistance must be kept low ...

Page 9

... TYPICAL LOAD R L CURRENT = 30mA * SELECT R1 TO DELIVER TYPICAL LOAD CURRENT. LT1236 WILL THEN SOURCE OR SINK AS NECESSARY TO MAINTAIN PROPER OUTPUT. DO NOT REMOVE LOAD AS OUTPUT WILL BE DRIVEN UNREGULATED HIGH. LINE REGULATION IS DEGRADED IN THIS APPLICATION CMOS DAC with Low Drift Full-Scale Trimming** OUT ...

Page 10

... LM334 6 V OUT X100 –11V TO – 40V LT1236 TA08 2-Pole Lowpass Filtered Reference MYLAR – LT1001 + OUT R1 R2 36k 36k TOTAL NOISE 0 10Hz MYLAR 1Hz f 10kHz 1mA) LOAD 27 LT1236 TA13 V REF 2 V RMS –V REF LT1236 TA12 ...

Page 11

... FEEDBACK LINEARIZES OUTPUT TO 0.005 C FROM * – 150 C ** WIREWOUND RESISTORS WITH LOW TC INPUT – 6.3V Q2 LT1236 R14 5k R15 10k R12 1k R13 24. =100mV/ C OUT – 150 C = 0.00385 = 10V AT 100 LT1236 TA09 OUTPUT R1 R2 GND LT1236 ES 11 ...

Page 12

... LT1236 PACKAGE DESCRIPTION 0.300 – 0.325 (7.620 – 8.255) 0.065 (1.651) 0.009 – 0.015 TYP (0.229 – 0.381) +0.025 0.045 0.015 0.325 –0.015 (1.143 0.381) +0.635 8.255 –0.381 0.100 0.010 (2.540 0.254) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. ...

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