NOTES: (1) Trimming the offset voltage will affect the drift slightly. See Installation and Operating Instructions for details. (2) The “box method” is used to specify output
voltage drift vs temperature. See the Discussion of Performance section. (3) Sample tested with power applied continuously.
ORDERING INFORMATION
MODEL
REF10JM
REF10KM
REF10RM
REF10SM
PACKAGE
Metal TO-99
Metal TO-99
Metal TO-99
Metal TO-99
TEMPERATURE
RANGE
0°C to +70°C
0°C to +70°C
–55°C to +125°C
–55°C to +125°C
MAX DRIFT
(ppm/
°
C)
3
1
6
3
ABSOLUTE MAXIMUM RATINGS
Input Voltage ........................................................................................ 40V
Power Dissipation at +25°C ............................................................ 200mV
Operating Temperature
J, K .................................................................................. –25°C to +85°C
R, S ............................................................................... –55°C to +125°C
Storage Temperature Range .......................................... –65°C to +125°C
Lead Temperature (soldering, 10s) ................................................ +300°C
Short-Circuit Protection at +25°C
to Common or +15VDC ........................................................ Continuous
PACKAGE INFORMATION
MODEL
REF10JM
REF10KM
REF10RM
REF10SM
PACKAGE
8-Pin Metal TO-99
8-Pin Metal TO-99
8-Pin Metal TO-99
8-Pin Metal TO-99
PACKAGE DRAWING
NUMBER
(1)
001
001
001
001
PIN CONFIGURATION
Top View
TAB
NC
NC 1
+V
CC
2
V
Z(1)
3
4
Common
NC = No Internal Connection.
8
7 NC
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix D of Burr-Brown IC Data Book.
6 V
OUT
5 Trim
NOTE: (1) Pin 3 is an unbuffered 6.3V output. Any load will affect the output
voltage and drift. A load of 1µA on pin 3 will typically change the output voltage
by 50µV and the drift by 0.1ppm/°C.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN
assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject
to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not
authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
®
REF10
2
TYPICAL PERFORMANCE CURVES
T
A
= +25°C, and
±15VDC
power supply, unless otherwise noted.
POWER TURN-ON RESPONSE
20
Error From Final Value (mV)
400
RESPONSE TO THERMAL SHOCK
15
10
5
0
–5
–10
–15
–20
Power Turn-On
Output Voltage
Cahnge (µV)
200
0
–200
T
A
=
+25°C
–400
0
Device Immersed in +70°C
Fluorinert Bath
T
A
= +70°C
5
10
Time (µs)
15
20
POWER SUPPLY REJECTION vs FREQUENCY
100
Power Supply Rejection (dB)
JUNCTION TEMPERATURE RISE
vs OUTPUT CURRENT
100
Max temp rise for
+85°C ambient
Junction Temperature Rise
Above Ambient (°C)
90
80
70
60
50
40
30
0
100
1k
Frequency (Hz)
10k
100k
80
Max temp rise for
+125°C ambient
V
CC
= 35V
V
CC
= 30V
V
CC
= 25V
60
40
V
CC
= 20V
V
CC
= 15V
20
0
0
2
4
6
8
10
Output Current (mA)
QUIESCENT CURRENT vs TEMPERATURE
5
Output Voltage Adjustment (mV)
OUTPUT VOLTAGE ADJUSTMENT vs R
S
10k
See Optional Output
Voltage Fine Adjust,
Figure 4.
Quiescent Current (mA)
4
1k
Voltage Increase
100
3
2
10
Voltage Decrease
1
–75
–50
–25
0
25
50
75
100
125
Temperature (°C)
1
10k
100k
1M
R
S
(Ω)
10M
100M
®
3
REF10
TYPICAL PERFORMANCE CURVES
(CONT)
T
A
= +25°C, and
±15VDC
power supply, unless otherwise noted.
TYPICAL REF10 NOISE
Noise Voltage (µV) (Referred to Input)
6
4
2
0
–2
–4
–6
Noise Voltage (µV) (Referred to Input)
TYPICAL HEATED ZENER NOISE
6
4
2
0
–2
–4
–6
Low Frequency Noise
(see Noise Test Circuit)
Low Frequency Noise
(see Noise Test Circuit)
TYPICAL BANDGAP REFERENCE NOISE
Noise Voltage (µV) (Referred to Input)
6
4
2
20Ω
2kΩ
Oscilloscope
–
8KΩ
100µF
0
–2
–4
–6
DUT
OPA27
+
2µF
15.8kΩ
Gain = 100V/V
f
3dB
= 0.1Hz and 10Hz
Low Frequency Noise
(see Noise Test Circuit)
NOISE TEST CIRCUIT
®
REF10
4
THEORY OF OPERATION
The following discussion refers to the diagram on the first
page.
In operation, approximately 6.3V is applied to the
noninverting input of op amp A
1
by zener diode D
Z1
. This
voltage is amplified by A
1
to produce the 10.00V output.
The gain is determined by R
1
and R
2
: G = (R
1
+ R
2
)/R
1
. R
1
and R
2
are actively laser-trimmed to produce an exact
10.00V output. The zener operating current is derived from
the regulated output voltage through R
3
. This feedback
arrangement provides closely regulated zener current. R
3
is
actively laser-trimmed to set the zener current to a level
which results in low drift at the output of A
1
. R
4
allows user-
trimming of the output voltage by providing for a small
external adjustment of amplifier gain. Since the TCR of R
4
closely matches the TCR of the gain setting resistors, the
voltage trim has minimal effect on the drift of the reference.
Output Voltage (V)
V
UPPER BOUND
+10.0007
V
1
V
NOMINAL
+10.0000
V
2
+9.9993
Typical Drift
Diagonal
1ppm/°C for REF10KM
V
UPPER BOUND
700µV
Worst-case
∆V
OUT
for REF10KM
0
(T
LOW
)
25
Temperature (°C)
70
(T
HIGH
)
FIGURE 1. REF10KM Output Voltage Drift.
DISCUSSION OF
PERFORMANCE
The REF10 is designed for applications requiring a precision
voltage reference where both the initial value at room
temperature and the drift over temperature are of importance
to the user. Two basic methods of specifying voltage refer-
ence drift versus temperature are in common usage in the
industry—the “butterfly method” and the “box method.”
The REF10 is specified with the more commonly used box
method. The “box” is formed by the high and low specifica-
tion temperatures and a diagonal, the slope of which is equal
to the maximum specified drift.
For the REF10, each J and K unit is tested at temperatures
of 0°C, +25°C, +50°C, and +70°C. Each R and S unit is
tested at –55°C, –25°C, 0°C, +25°C, +50°C, +75°C, +100°C
and +125°C. The minimum and maximum test voltages
must meet this condition:
INSTALLATION AND
OPERATING INSTRUCTIONS
BASIC CIRCUIT CONNECTION
Figure 2 shows the proper connection of the REF10. To
achieve the specified performance, pay careful attention to
layout. A low resistance star configuration will reduce volt-
age errors, noise pickup, and noise coupled from the power
supply. Commons should be connected as indicated being
sure to minimize interconnection resistances.
(1)
2
(2)
V
CC
+ 1µF
Tantalum
6
REF10
V
OUT MAX
– V
OUT MIN
/ 10V
6
Drift
X
10
≤
Specification
T
HIGH
– T
LOW
This assures the user that the variations of output voltage
that occur as the temperature changes within the specifica-
tion range, T
LOW
to T
HIGH
, will be contained within a box
whose diagonal has a slope equal to the maximum specified
drift. Since the shape of the actual drift curve is not known,
the vertical position of the box is not exactly known either.
It is, however, bounded by V
UPPER BOUND
and V
LOWER BOUND
(see
Figure 1).
Figure 1 uses the REF10KM as an example. It has a drift
specification of 1ppm/°C maximum and a specification
temperature range of 0°C to +70°C. The “box” height (V
1
to
V
2
) is 700µV, and upper bound and lower bound voltages
are a maximum of 700µV away from the voltage at +25°C.
(1)
(
)
R
L1
R
L2
R
L3
4
(2)
NOTES: (1) Lead resistances here of up to a few
Ω
have negligible effect on
performance. (2) A resistance of 0.1Ω in series with these leads will cause
a 1mV error when the load current is at its maximum of 10mA. This results
in a 0.01% error of 10V.
FIGURE 2. REF10 Installation.
OPTIONAL OUTPUT VOLTAGE ADJUSTMENT
Optional output voltage adjustment circuits are shown in
Figures 3 and 4. Trimming the output voltage will change
the voltage drift by approximately 0.01ppm/°C per mV of
trimmed voltage. In the circuit in Figure 3, any mismatch in
TCR between the two sections of the potentiometer will also
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