RH1021-7
Precision 7V Reference
DESCRIPTION
The RH1021-7 is a precision 7V 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. This
reference can also be used as a shunt regulator
(2-terminal Zener). Unique circuit design makes the
RH1021-7 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.
ABSOLUTE
MAXIMUM
RATINGS
Input Voltage ........................................................... 40V
Input/Output Voltage Differential ............................. 35V
Output to Ground Voltage
(Shunt Mode Current Limit) ............................... 10V
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
, LTC and LT are registered trademarks of Linear Technology Corporation.
BUR -I CIRCUIT
PACKAGE/ORDER INFORMATION
TOP VIEW
NC*
7
8
1
20V
2
3
4
RH1021-7
5
8
NC* 1
6
7 NC*
6 V
OUT
5 NC*
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
RH1021-7
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:
Shunt mode regulation is measured with the input open. With the
input connected, shunt mode current can be reduced to 0mA. Load
regulation will remain the same.
Note 5:
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
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 6:
Consult factory for units with long term stability data.
Note 7:
V
IN
= 12V, I
OUT
= 0, T
A
= 25°C, unless otherwise noted.
Note 8:
I
OUT(MAX)
(Sourcing) is 5mA for exposures greater than
100Krad (Si).
Note 9:
V
IN
= 12V, 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.
U W
3
RH1021-7
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage
7.01
V
IN
= 12V
I
OUT
= 0
OUTPUT VOLTAGE (V)
LOAD REGULATION (ppm/mA)
LOAD REGULATION (ppm/mA)
6.99
1
10
100
TOTAL DOSE Krad (Si)
Line Regulation
1.0
15
TEMPERATURE COEFFICIENT (ppm/°C)
0.5
LINE REGULATION (ppm/V)
0
–0.5
–1.0
–1.5
–2.0
12V
≤
V
IN
≤
40V
8.5V
≤
V
IN
≤
12V
5
0
–5
–10
–15
MINIMUM CURRENT (mA)
1
10
100
TOTAL DOSE Krad (Si)
4
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
q
FAX
: (408) 434-0507
q
TELEX
: 499-3977
U W
RH1021-7 G01
RH1021-7 G04
Load Regulation (Shunt Mode)
60
50
40
30
20
10
0
1000
V
IN
= OPEN
1.2mA
≤
I
OUT
≤
10mA
18
16
14
12
10
8
Load Regulation (Sourcing)
V
IN
= 12V
0mA
≤
I
OUT
≤
10mA
NOTE 8
6
4
1
10
100
TOTAL DOSE Krad (Si)
1000
RH1021-7 G02
1
10
100
TOTAL DOSE Krad (Si)
1000
RH1021-7 G03
Temperature Coefficient
0.9
V
IN
= 12V
10
0.8
0.7
0.6
0.5
0.4
0.3
Minimum Current (Shunt Mode)
V
IN
= OPEN
1000
1
10
100
TOTAL DOSE Krad (Si)
1000
RH1021-7 G05
1
10
100
TOTAL DOSE Krad (Si)
1000
RH1021-7 G06
I.D. No. 66-10-0177 Rev. A 0896
LT/HP 0896 .5K REV A • PRINTED IN USA
©
LINEAR TECHNOLOGY CORPORATION 1990
嵌入式系统
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