RH1021-5
Precision 5V Reference
DESCRIPTION
The RH1021-5 is a precision 5V reference with ultralow
drift and noise, extremely good long term stability and
almost total immunity to input voltage variations. The
reference output will source and sink up to 10mA. Unique
circuit design makes the RH1021-5 the first IC reference
to offer ultralow drift without the use of high power on-
chip heaters.
The wafer lots are processed to Linear Technology’s in-
house Class S flow to yield circuits usable in stringent
military applications.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ABSOLUTE
MAXIMUM
RATINGS
Input Voltage ........................................................... 40V
Input/Output Voltage Differential ............................. 35V
Trim Pin-to-Ground Voltage
Positive................................................ Equal to V
OUT
Negative ........................................................... – 20V
Output Short-Circuit Duration
V
IN
= 35V ........................................................ 10 sec
V
IN
20V ................................................... Indefinite
Operating Temperature Range .............. – 55°C to 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
BUR -I CIRCUIT
PACKAGE/ORDER INFORMATION
TOP VIEW
NC*
7
8
1
20V
2
3
4
RH1021-5
5
8
NC* 1
6
7 NC*
6 V
OUT
5 TRIM
4
GND
V
IN
2
NC* 3
–20V
H PACKAGE
8-LEAD TO-5 METAL CAN
* Connected internally. Do not connect external
circuitry to these pins.
U
U
W
W W
U
W
U
U U
1
RH1021-5
TABLE 1A: ELECTRICAL CHARACTERISTICS
Note 1:
Output voltage is measured immediately after turn-on. Changes
due to chip warm-up are typically less than 0.005%.
Note 2:
Temperature coefficient is measured by dividing the change in
output voltage over the temperature range by the change in temperature.
Separate tests are done for hot and cold; T
MIN
to 25°C and 25°C to T
MAX
.
Incremental slope is also measured at 25°C.
Note 3:
Line and load regulation are measured on a pulse basis. Output
changes due to die temperature change must be taken into account
separately. Package thermal resistance is 150°C/W for the TO-5 (H)
package.
Note 4:
RMS noise is measured with a 2-pole highpass filter at 10Hz and a
2-pole lowpass filter at 1kHz. The resulting output is full wave rectified and
(Postirradiation) (Note 6)
then integrated for a fixed period, making the final reading an average as
opposed to RMS. Correction factors are used to convert from average to
RMS and to correct for the nonideal bandpass of the filters. Peak-to-peak
noise is measured with a single highpass filter at 0.1Hz and a 2-pole
lowpass filter at 10Hz. The unit is enclosed in a still-air environment to
eliminate thermocouple effects on the leads. Test time is 10 seconds.
Note 5:
Consult factory for units with long term stability data.
Note 6:
V
IN
= 10V, I
OUT
= 0, T
A
= 25°C, unless otherwise noted.
Note 7:
I
OUT(MAX)
(Sourcing) is 5mA for exposures greater than 100Krad
(Si).
Note 8:
V
IN
= 10V, I
OUT
= 0, unless otherwise noted.
TABLE 2: ELECTRICAL TEST REQUIRE E TS
MIL-STD-883 TEST REQUIREMENTS
Final Electrical Test Requirements (Method 5004)
Group A Test Requirements (Method 5005)
Group B and D for Class S, and
Group C and D for Class B
End Point Electrical Parameters (Method 5005)
* PDA Applies to subgroup 1. See PDA Test Notes.
SUBGROUP
1*,2,3,4
1,2,3,4
1
PDA Test Notes
The PDA is specified as 5% based on failures from group A, subgroup 1,
tests after cooldown as the final electrical test in accordance with method
5004 of MIL-STD-883. The verified failures of group A, subgroup 1, after
burn-in divided by the total number of devices submitted for burn-in in
that lot shall be used to determine the percent for the lot.
Linear Technology Corporation reserves the right to test to tighter limits
than those given.
TOTAL DOSE BIAS CIRCUIT
15V
V
IN
GND
–15V
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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3
RH1021-5
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage
5.01
V
IN
= 10V
I
OUT
= 0
OUTPUT VOLTAGE (V)
LOAD REGULATION (ppm/mA)
LOAD REGULATION (ppm/mA)
5.00
4.99
1
10
100
TOTAL DOSE Krad (Si)
Line Regulation
1.0
0.5
LINE REGULATION (ppm/V)
TEMPERATURE COEFFICIENT (ppm/°C)
0
–0.5
–1.0
–1.5
–2.0
1
4
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
q
FAX
: (408) 434-0507
q
TELEX
: 499-3977
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RH1021-5 G01
Load Regulation (Sinking)
60
50
40
30
20
10
0
V
IN
= 10V
0mA
≤
I
OUT
≤
10mA
18
16
14
12
10
8
Load Regulation (Sourcing)
V
IN
= 10V
0mA
≤
I
OUT
≤
10mA
NOTE 8
6
4
1000
1
10
100
TOTAL DOSE Krad (Si)
1000
RH1021-5 G03
1
10
100
TOTAL DOSE Krad (Si)
1000
RH1021-5 G05
Temperature Coefficient
15
V
IN
= 10V
10
5
0
–5
–10
–15
10V
≤
V
IN
≤
40V
7.2V
≤
V
IN
≤
10V
10
100
TOTAL DOSE Krad (Si)
1000
RH1021-5 G02
1
10
100
TOTAL DOSE Krad (Si)
1000
RH1021-5 G04
I.D. No. 66-10-0177 Rev. A 0796
LT/HP 0796 500 REV A • PRINTED IN USA
©
LINEAR TECHNOLOGY CORPORATION 1990
Embedded System
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