LT1236-5 Linear Technology, LT1236-5 Datasheet

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LT1236-5

Manufacturer Part Number
LT1236-5
Description
Precision Reference
Manufacturer
Linear Technology
Datasheet
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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LT1236-5 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

... LT1236 BSOLUTE Input Voltage .......................................................... 40V Input/Output Voltage Differential ............................ 35V Output-to-Ground Voltage (Shunt Mode Current Limit) LT1236-5 ............................................................. 10V LT1236-10 ........................................................... 16V Trim Pin-to-Ground Voltage Positive................................................ Equal to V Negative ........................................................... – 20V U PACKAGE/ORDER I FOR ATIO TOP VIEW NC NC ...

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 MAX UNITS ...

Page 4

... Differential, LT1236-10 1 125 – 1 1.0 J 0.8 0.6 0.4 0.2 0 10k OUTPUT CURRENT (mA) LT1236 G02 Output Voltage Noise Spectrum 400 350 300 250 V OUT 200 150 LT1236-10 100 LT1236 100 1k FREQUENCY (Hz) LT1236 G05 LT1236 G03 1M LT1236 G06 ...

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

... OUT GND LOAD LT1236 AI03 Series Mode with Boost Transistor INPUT R1 220 2N3906 IN LT1236 OUT GND LOAD R2* GROUND RETURN *OPTIONAL—REDUCES CURRENT IN OUTPUT SENSE LEAD 2.4k (LT1236-5), 5.6k (LT1236-10) LT1236 AI04 Negative Series Reference 15V R1 LT1236-10 4. GND R2 15V 4.7k –15V Q1 2N2905 + OUT –10V AT ...

Page 9

... GND 10V AT LT1236-10 100mA OUT 2 F SOLID TANT GND –15V –10V 1.5mA LT1236 TA06 LOAD –15V Operating 5V Reference from 5V Supply 1N914 LT1236-5 1N914 + 8.5V IN OUT + C2* GND C1 Trimming 10V Units to 10.24V LT1236- OUT V IN OUT TRIM GND 4.32k 5k – ...

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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