REF102
REF
102
REF
102
SBVS022A – SEPTEMBER 2000 – REVISED NOVEMBER 2003
10V Precision
Voltage Reference
FEATURES
q
+10V
±
0.0025V OUTPUT
q
VERY LOW DRIFT: 2.5ppm/
°
C max
q
EXCELLENT STABILITY:
5ppm/1000hr typ
q
EXCELLENT LINE REGULATION:
1ppm/V max
q
EXCELLENT LOAD REGULATION:
10ppm/mA max
q
LOW NOISE: 5
µ
V
PP
typ, 0.1Hz to 10Hz
q
WIDE SUPPLY RANGE: 11.4VDC to 36VDC
q
LOW QUIESCENT CURRENT: 1.4mA max
q
PACKAGE OPTIONS: PLASTIC DIP, SO-8
APPLICATIONS
q
PRECISION-CALIBRATED VOLTAGE
STANDARD
q
D/A AND A/D CONVERTER REFERENCE
q
PRECISION CURRENT REFERENCE
q
ACCURATE COMPARATOR THRESHOLD
REFERENCE
q
DIGITAL VOLTMETERS
q
TEST EQUIPMENT
q
PC-BASED INSTRUMENTATION
DESCRIPTION
The REF102 is a precision 10V voltage reference. The drift
is laser-trimmed to 2.5ppm/°C max C-grade over the indus-
trial temperature range. The REF102 achieves its precision
without a heater. This results in low power, fast warm-up,
excellent stability, and low noise. The output voltage is
extremely insensitive to both line and load variations and can
be externally adjusted with minimal effect on drift and
stability. Single supply operation from 11.4V to 36V and
excellent overall specifications make the REF102 an ideal
choice for demanding instrumentation and system reference
applications.
R
5
Trim
5
V+
2
50kΩ
R
2
14kΩ
R
3
8kΩ
–
R
1
22kΩ
A
1
+
6
V
OUT
R
6
7kΩ
R
4
4kΩ
DZ
1
8
4
Noise Common
Reduction
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 2000-2003, Texas Instruments Incorporated
www.ti.com
ABSOLUTE MAXIMUM RATINGS
(1)
Input Voltage ...................................................................................... +40V
Operating Temperature
P, U ................................................................................. –25°C to +85°C
Storage Temperature Range
P, U ............................................................................... –40°C to +125°C
Lead Temperature (soldering, 10s) ............................................... +300°C
(SO, 3s) ........................................................... +260°C
Short-Circuit Protection to Common or V+ .............................. Continuous
NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may be
more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
PACKAGE/ORDERING INFORMATION
(1)
MAX INITIAL
ERROR (mV)
±10
±10
±10
±5
±5
±5
±2.5
±2.5
±2.5
MAX DRIFT
(PPM/
°
C)
±10
±10
±10
±5
±5
±5
±2.5
±2.5
±2.5
PACKAGE
DESIGNATOR
D
D
P
D
D
P
D
D
P
SPECIFIED
TEMPERATURE
RANGE
–25°C to +85°C
"
"
"
"
"
"
"
"
PACKAGE
MARKING
REF102AU
REF102AU/2K5
REF102AP
REF102BU
REF102BU/2K5
REF102BP
REF102CU
REF102CU/2K5
REF102CP
ORDERING
NUMBER
REF102AU
REF102AU/2K5
REF102AP
REF102BU
REF102BU/2K5
REF102BP
REF102CU
REF102CU/2K5
REF102CP
TRANSPORT
MEDIA, QUANTITY
Tube, 100
Tape and Reel, 2500
Tube, 50
Tube, 100
Tape and Reel, 2500
Tube, 50
Tube, 100
Tape and Reel, 2500
Tube, 50
PRODUCT
REF102AU
"
REF102AP
REF102BU
"
REF102BP
REF102CU
"
REF102CP
PACKAGE-LEAD
SO-8
SO-8
DIP-8
SO-8
SO-8
DIP-8
SO-8
SO-8
DIP-8
NOTE: (1) For the most current package and ordering information, see the Package Option Addendum located at the end of this data sheet.
PIN CONFIGURATIONS
Top View
DIP, SO
NC
V+
NC
1
2
3
8
7
6
5
Noise Reduction
NC
V
OUT
Trim
Com 4
NC = Not Connected
2
REF102
www.ti.com
SBVS022A
ELECTRICAL CHARACTERISTICS
At T
A
= +25°C and V
S
= +15V power supply, unless otherwise noted.
REF102A
PARAMETER
OUTPUT VOLTAGE
Initial
vs Temperature
(1)
vs Supply
(Line Regulation)
vs Output Current
(Load Regulation)
vs Time
M Package
P, U Packages
(2)
Trim Range
(3)
Capacitive Load, max
NOISE
OUTPUT CURRENT
INPUT VOLTAGE
RANGE
QUIESCENT CURRENT
WARM-UP TIME
TEMPERATURE
RANGE
Specification
REF102A, B, C
✻
Specifications same as REF102A.
NOTES: (1) The “box” method is used to specify output voltage drift vs temperature. See the Discussion of Performance section.
(2) Typically 5ppm/1000hrs after 168hr powered stabilization.
(3) Trimming the offset voltage affects drift slightly. See Installation and Operating Instructions for details.
(4) With noise reduction pin floating. See Typical Characteristics for details.
(4)
REF102B
MAX
10.01
10
2
20
40
MIN
9.995
TYP
MAX
10.005
5
1
10
20
✻
✻
✻
✻
✻
✻
✻
+36
+1.4
✻
✻
✻
✻
✻
✻
MIN
9.9975
REF102C
TYP
MAX
10.0025
2.5
1
10
20
✻
UNITS
V
ppm/°C
ppm/V
ppm/mA
ppm/mA
ppm/1000hr
ppm/1000hr
%
pF
µV
PP
mA
✻
✻
✻
V
mA
µs
CONDITIONS
T
A
= 25°C
MIN
9.99
TYP
V
S
= 11.4V to 36V
I
L
= 0mA to +10mA
I
L
= 0mA to –5mA
T
A
= +25°C
5
20
±3
1000
0.1Hz to 10Hz
+10, –5
+11.4
I
OUT
= 0
To 0.1%
15
5
✻
✻
–25
+85
✻
✻
✻
✻
°C
REF102
SBVS022A
www.ti.com
3
TYPICAL CHARACTERISTICS
At T
A
= +25°C, V
S
= +15V, unless otherwise noted.
POWER TURN-ON RESPONSE
POWER TURN-ON RESPONSE with 1µF C
N
V
OUT
V
OUT
V
IN
V
IN
Time (5µs/div)
Power Turn-On
Time (10ms/div)
Power Turn-On
POWER SUPPLY REJECTION vs FREQUENCY
130
+1.5
LOAD REGULATION
Power Supply Rejection (dB)
110
100
90
80
70
60
1
100
Frequency (Hz)
1k
10k
Output Voltage Change (mV)
120
+1.0
+0.5
0
−0.5
−1.0
−1.5
–5
0
+5
+10
Output Current (mA)
RESPONSE TO THERMAL SHOCK
+600
1.6
QUIESCENT CURRENT vs TEMPERATURE
Output Voltage Change (µV)
+300
Quiescent Current (mA)
1.4
0
1.2
–300
T
A
=
+25°C
–600
0
REF102C Immersed in +85°C Fluorinert Bath
T
A
= +85°C
1.0
0.8
15
30
Time (s)
45
60
−75
−50
−25
0
+25
+50
+75
+100
+125
Temperature (°C)
4
REF102
www.ti.com
SBVS022A
TYPICAL CHARACTERISTICS
(Cont.)
At T
A
= +25°C, V
S
= +15V, unless otherwise noted.
TYPICAL REF102 REFERENCE NOISE
20Ω
6
2kΩ
Oscilloscope
Noise Voltage (µV)
4
–
2
0
−2
−4
−6
Low Frequency Noise (1s/div)
(See Noise Test Circuit)
8kΩ
100µF
DUT
15.8kΩ
OPA227
+
2µF
Gain = 100V/V
f
−3dB
= 0.1Hz and 10Hz
Noise Test Circuit.
THEORY OF OPERATION
Refer to the diagram on the first page of this data sheet. The
10V output is derived from a compensated buried zener
diode DZ
1
, op amp A
1
, and resistor network R
1
– R
6
.
Approximately 8.2V is applied to the non-inverting input of A
1
by DZ
1
. R
1
, R
2
, and R
3
are laser-trimmed to produce an exact
10V output. The zener bias current is established from the
regulated output voltage through R
4
. R
5
allows user-trimming
of the output voltage by providing for small external adjust-
ment of the amplifier gain. Because the temperature coeffi-
cient (TCR) of of R
5
closely matches the TCR of R
1
, R
2
and
R
3
, the voltage trim has minimal effect on the reference drift.
The output voltage noise of the REF102 is dominated by the
noise of the zener diode. A capacitor can be connected
between the Noise Reduction pin and ground to form a low-
pass filter with R
6
and roll off the high-frequency noise of the
zener.
REF102 is specified by 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.
Since the shape of the actual drift curve is not known, the
vertical position of the box is not known, either. It is, however,
bounded by V
UPPER BOUND
and V
LOWER BOUND
(see Figure 1).
Figure 1 uses the REF102CU as an example. It has a drift
specification of 2.5ppm/°C maximum and a specification
temperature range of –25°C to +85°C. The “box” height,
V
1
to V
2
, is 2.75mV.
REF102CU V
UPPER BOUND
+10.00275
Output Voltage (V)
V1
V
NOMINAL
+10.0000
V2
+9.99725
REF102CU V
LOWER BOUND
DISCUSSION
OF PERFORMANCE
The REF102 is designed for applications requiring a preci-
sion 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
2.75mV
Worst-case
∆V
OUT
for
REF102CU
−25
0
+25
+50
Temperature (°C)
+85
FIGURE 1. REF102CU Output Voltage Drift.
REF102
SBVS022A
www.ti.com
5
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