LT1236
Precision Reference
DESCRIPTIO
FEATURES
n The LT 1236 is a precision reference that combines ultra-
Ultra-Low Drift: 5ppm/C Max
n low drift and noise with excellent long-term stability and
Trimmed to High Accuracy: 0.05% Max
n high output accuracy. The reference output will both
Industrial Temperature Range SO Package
n source and sink up to 10mA and is almost totally immune
Operates in Series or Shunt Mode
n to input voltage variations. Two voltages are available: 5V
Pin Compatible with AD586, AD587
n and 10V. The 10V version can be used as a shunt regulator
Output Sinks and Sources in Series Mode
n (two-terminal zener) with the same precision characteris-
Very Low Noise < 1ppm (0.1Hz to 10Hz)
P-P
n tics as the three-terminal connection. Special care has
100% Noise Tested
n been taken to minimize thermal regulation effects and
> 100dB Ripple Rejection
n temperature induced hysteresis.
Minimum Input/Output Differential of 1V
The LT1236 combines both superior accuracy and tem-
perature coefficient specifications without the use of high
PPLICATI S
A
power, on-chip heaters. The LT1236 references are based
n
A/D and D/A Converters
on a buried zener diode structure which eliminates noise
n
Precision Regulators
and stability problems with surface breakdown devices.
n
Precision Scales
Further, a subsurface zener exhibits better temperature
n
Inertial Navigation Systems
drift and time stability than even the best band-gap
n
Digital Voltmeters
references.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATI
Basic Positive and Negative Connections Typical Distribution of Temperature Drift
24
DISTRIBUTION
22
OF THREE RUNS
LT1236 LT1236-10
20
V IN V IN
OUT NC OUT
IN OUT 18
GND GND
16
14
V
OUT
12
V (V )
OUT
10
R1 =
R1
I + 1.5mA
LOAD
8
15V
6
(V )
4
LT1236 TA01
2
0
3 2 1 0 1 23
OUTPUT DRIFT (ppm/C)
LT1236 TA02
1
UNITS (%)
UO
UO
ULT1236
ABSOLUTEXAI U RATI GS
Input Voltage .......................................................... 40V
Output Short-Circuit Duration
Input/Output Voltage Differential ............................ 35V
V = 35V......................................................... 10 sec
IN
Output-to-Ground Voltage (Shunt Mode Current Limit)
V 20V ................................................... Indefinite
IN
LT1236-5............................................................. 10V
Operating Temperature Range
LT1236-10 ........................................................... 16V
LT1236AC, BC, CC.................................. 0C to 70C
Trim Pin-to-Ground Voltage
LT1236AI, BI, CI ................................ 40C to 85C
Positive................................................ Equal to V
Storage Temperature Range ................ 65C to 150C
OUT
Negative ........................................................... 20V
Lead Temperature (Soldering, 10 sec)................ 300C
PACKAGE/ORDER I FOR ATIO
ORDER PART ORDER PART
NUMBER NUMBER
TOP VIEW
TOP VIEW
LT1236ACN8-5 LT1236ACS8-5 LT1236AIS8-5
NC*
1
8
NC*
LT1236BCN8-5 NC*
1
8
NC*
LT1236BCS8-5 LT1236BIS8-5
V
2
7
NC*
LT1236CCN8-5 V
2
NC*
LT1236CCS8-5 LT1236CIS8-5
IN 7
IN
NC*
3
V
LT1236ACN8-10 LT1236ACS8-10 LT1236AIS8-10
6
NC*
3
6
V
0UT 0UT
LT1236BCN8-10 LT1236BCS8-10 LT1236BIS8-10
GND 4 5
TRIM** GND TRIM**
4 5
LT1236CCN8-10 LT1236CCS8-10 LT1236CIS8-10
N8 PACKAGE
S8 PACKAGE
LT1236AIN8-5
8-LEAD PDIP
8-LEAD PLASTIC SO
*
CONNECTED INTERNALLY.
LT1236BIN8-5 S8 PART MARKING
*
CONNECTED INTERNALLY.
D0 NOT CONNECT EXTERNAL
D0 NOT CONNECT EXTERNAL
LT1236CIN8-5
CIRCUITRY TO THESE PINS
CIRCUITRY TO THESE PINS
236AC5 236AI5
LT1236AIN8-10
**
SEE APPLICATIONS
**
SEE APPLICATIONS
236BC5 236BI5
INFORMATION SECTION
INFORMATION SECTION
LT1236BIN8-10
236CC5 236CI5
T = 125C, = 130C/W T = 125C, = 190C/W
JMAX JA JMAX JA
LT1236CIN8-10
236AC1 236AI1
236BC1 236BI1
236CC1 236CI1
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS V = 10V, I = 0, T = 25C, unless otherwise noted.
IN OUT A
LT1236-5
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage (Note 1) LT1236A-5 4.9975 5.000 5.0025 V
LT1236B-5/LT1236C-5 4.9950 5.000 5.0050 V
Output Voltage Temperature Coefficient (Note 2) T T T
MIN J MAX
LT1236A-5 2 5 ppm/C
LT1236B-5 5 10 ppm/C
LT1236C-5 10 15 ppm/C
Line Regulation (Note 3) 7.2V V 10V 4 12 ppm/V
IN
l 20 ppm/V
10V V 40V 2 6 ppm/V
IN
l 10 ppm/V
Load Regulation (Sourcing Current) 0 I 10mA 10 20 ppm/mA
OUT
(Note 3) l 35 ppm/mA
2
U WU
U W W W