LT1021
Precision Reference
FEATURES DESCRIPTIO
Ultralow Drift: 5ppm/C Max Slope The LT 1021 is a precision reference with ultralow drift
Very Low Noise: <1ppm (0.1Hz to 10Hz) and noise, extremely good long term stability and almost
P-P
100% Noise Tested total immunity to input voltage variations. The reference
Pin Compatible with Most Bandgap Reference output will both source and sink up to 10mA. Three
Applications, Including Ref 01, Ref 02, LM368, voltages are available: 5V, 7V and 10V. The 7V and 10V
MC1400 and MC1404 with Greatly Improved units can be used as shunt regulators (two-terminal zeners)
Stability, Noise and Drift with the same precision characteristics as the three-
Trimmed Output Voltage terminal connection. Special care has been taken to mini-
Operates in Series or Shunt Mode mize thermal regulation effects and temperature
Output Sinks and Sources in Series Mode induced hysteresis.
>100dB Ripple Rejection
The LT1021 references are based on a buried zener diode
Minimum Input/Output Differential of 1V
structure that eliminates noise and stability problems
Available in 5-Lead Can, N8 and S8 Packages
associated with surface breakdown devices. Further, a
subsurface zener exhibits better temperature drift and
U
time stability than even the best bandgap references.
APPLICATIO S
Unique circuit design makes the LT1021 the first IC
A/D and D/A Converters
reference to offer ultralow drift without the use of high
Precision Regulators
power on-chip heaters.
Digital Voltmeters
Inertial Navigation Systems
The LT1021-7 uses no resistive divider to set output
Precision Scales
voltage, and therefore exhibits the best long term stability
Portable Reference Standard
and temperature hysteresis. The LT1021-5 and LT1021-
10 are intended for systems requiring a precise 5V or 10V
reference with an initial tolerance as low as 0.05%.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
Typical Distribution of Temperature Drift
24
Basic Positive and Negative Connections
DISTRIBUTION
OF THREE RUNS
21
LT1021
LT1021
18
(7 AND 10 ONLY)
15
V IN OUT V NC IN OUT
IN OUT
GND GND
12
V
OUT 9
V (V )
OUT
R1 = 6
R1
I + 1.5mA
LOAD
3
15V
(V )
1021 TA01
0
5 4 3 2 1 0 1 2 3 4 5
OUTPUT DRIFT (ppm/C)
1021 TA01
1021fc
1
UNITS (%)
U
ULT1021
ABSOLUTEXAI U RATI GS (Note 1)
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
LT1021-5............................................................. 10V
Operating Temperature Range
LT1021-7............................................................. 10V
Commercial ............................................ 0C to 70C
LT1021-10........................................................... 16V
Industrial ........................................... 40C to 85C
Trim Pin-to-Ground Voltage
Military ............................................ 55C to 125C
Positive ............................................... Equal to V
Storage Temperature Range ................ 65C to 150C
OUT
Negative ........................................................... 20V
Lead Temperature (Soldering, 10 sec)................ 300C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
TOP VIEW
NC*
8 DNC* 1 8 DNC*
1 NC*
NC* 7
V 2 DNC*
7
IN
V 2 6
V DNC* 3 6 V
IN 0UT
OUT
GND TRIM**
4 5
3 5
TRIM**
NC*
4
N8 PACKAGE S8 PACKAGE
GND
8-LEAD PDIP 8-LEAD PLASTIC SO
H PACKAGE
*CONNECTED INTERNALLY. DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS.
8-LEAD TO-5 METAL CAN
**NO TRIM PIN ON LT1021-7. DO NOT CONNECT EXTERNAL CIRCUITRY TO PIN 5 ON LT1021-7
*CONNECTED INTERNALLY. DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS.
T = 130C, = 130C/W (N)
JMAX JA
**NO TRIM PIN ON LT1021-7. DO NOT CONNECT EXTERNAL CIRCUITRY TO PIN 5 ON LT1021-7
T = 130C, = 150C/W (S)
JMAX JA
T = 150C, = 150C/W, = 45C/W
JMAX JA JC
ORDER PART NUMBER N8 ORDER PART NUMBER
LT1021BCH-5 LT1021DCH-5 LT1021BCN8-5
LT1021BMH-5 LT1021DMH-5 LT1021CCN8-5
LT1021CCH-5 LT1021BCH-7 LT1021CIN8-5
LT1021CMH-5 LT1021BMH-7 LT1021DCN8-5
LT1021BMH-10 LT1021DCH-7 LT1021DIN8-5
LT1021DMH-7 LT1021BCN8-7
LT1021BCH-10 LT1021DCN8-7
LT1021CMH-10 LT1021BCN8-10
LT1021DCH-10 LT1021CCN8-10
LT1021DMH-10 LT1021CIN8-10
LT1021DCN8-10
OBSOLETE
LT1021DIN8-10
S8 PART MARKING
S8 ORDER PART NUMBER
LT1021DCS8-5 2105
LT1021DCS8-7 2107
LT1021DCS8-10 2110
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: