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AD2712KN-AD2712LN
+(-) 10.000 Volt Ultrahigh Precision Reference Series
ANALOG
DEVICES
$10.00!) Volt Ultrahigh
Precision Reference Series
AD2710/AD2712
FEATURES
Laser Trimmed to High Accuracy: 10.000V t 1.0mV
Low Temperature Coefficient: 1ppmf'C it. Grade)
Excellent Long Term Stability: 25ppm/1000hrs.
SmA Output Current Capability
Low Noise: MPV p-p
Short Circuit Protected
No Heater Utilized
Small Size (Standard 14-Pin DIP Package)
PRODUCT DESCRIPTION
The AD2710 and AD2712 are tcmperature-compensated,
hybrid voltage references which provide precise 10.000V out-
put from an unregulated input level from 13.5 to 16.5 volts.
Active laser trimming is used to trim both the initial error at
+25°C as well as the temperature coefficient, which results in
ultra high precision performance previously available only in
oven-regulated modules. The 1.0mV maximum initial error
and 1ppm/°C guaranteed maximum temperature coefficient
of the AD2710L and AD2712L represent the best perform-
ance combination available without using ovens or heated
substrates for temperature regulation.
The AD2710 series of precision 10.000 volt references offer
the user unequalled accuracy and stability with performance
guaranteed over the 0 to +70°C temperature range. The devices
combine the recognized advantages of thin film technology
and active laser trimming with a unique integrated ceramic
package design to provide an excellent reference for use in
applications requiring high accuracy and stability.
The AD2710 is recommended for use as a reference for IO-,
12- and 14-bit D/A converters which require an external refer-
ence. The device is also suitable for many types of high resolu-
tion AID converters, either successive approximation or inte-
grating designs. The SmA output drive capability of the device
also makes the AD2710 ideal for use as a master system
reference. r
For systems requiring a dual tracking reference, the AD2712
offers both positive and negative outputs in a single package.
All units are packaged in an integrated ceramic 14-pin side-
brazed package offering superior reliability over other package
designs.
REV. A
lnfprmation furnished by Analog Devices is believed to be accurate and
reliable, However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FUNCTIONAL BLOCK DIAGRAMS
ADJUST
+15.0V
, o.cooov
OUTPUT
AD2710
AD27t2
PRODUCT HIGHLIGHTS
I. Active laser trimming of both initial accuracy and tempera-
ture coefficient results in very high accuracy over the tem-
perature range without the use of external components.
AD2710 has a maximum deviation from 10.000 volts of
11.00mV at 25°C with no external adjustments.
2. The AD2710 and AD2 712 are well suited for a broad range
of applications requiring an accurate, stable reference source
such as data converters, test and measurement systems and
calibration standards.
3. The performance of the AD2710 series is achieved by a
well-characterized design and close control over the manu-
facturing process. This eliminates the need for temperature-
controlled ovens to provide stability.
4. The advanced multilayer integrated ceramic package results
in superior electrical performance as well as inherent high
reliability.
One Technology Way, P.0. Box 9106, Norwood, MA 02082-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703 wa: 71013946577
Telex: 924491 Cable: ANALOG NORWOODMASS
M271il/M2712-SPEiyFlMTl0lll
(typical © lls t15ll after a 5 minute warm-up at +25%,
no load condition unless otherwise specified)
Model AD27 lOKN AD2710LN AD2712KN AD2712LN
ABSOLUTE MAXIMUM RATINGS
Input Voltage (for applicable supply) 118V . . .
Power Dissipation (i) +25°C 300mw . 450mW ..
Operating Temperature Range 0 to +70°C . . .
Storage Temperature Range " fc to +100°C . . .
Lead Temperature (soldering, 20s) +260°C . . .
Short Circuit Protection (to GND) Continuous . . .
OUTPUT VOLTAGE ERROR'
+25°c i1.0mV max . . .
OUTPUT VOLTAGE TEMPERATURE
COEFFICIENTz o
+10V Output +25°C to +70°C t2ppm/0C max tlppm/ C max t2ppm/'C max ilppml°C max
o to +25°C tSppml°C max " . " o
-10V Output4 +25°C to +70°C Not Applicable Not Applicable iSmePC max Mppm/ C max
o to +25°C Not Applicable Not Applicable .tSppm/°C max ..
LINE REGULATION
vs = 213.5 to 1:16.55 125pv/v(200pV/V max) . . .
OUTPUT CURRENT lOmA . . .
LOAD REGULATION
Io = 0 to MmA 50pV/mA(100pV/mA max) . . '
OUTPUT RESISTANCE o.0sn t t t
INPUT VOLTAGE5
Operating Range Al 3V to ilBV . . .
Specified Performance ti3.5V to 116.5V . . .
QUIESCENT SUPPLY CURRENT
Vs+ 9mA( l4mA max) . 12mA (16mA max) ..
Vs-s Not Applicable Not Applicable 2mA (4mA max) . .
0.1 to 10Hz 3OpV p-p . . .
LONG-TERM STABILITY
TA = +25°C 25ppm/1000 Hours . . .
EXTERNAL TRIM RANGE6 ilOmV . . .
PACKAGE OPTION7 DH-14D . . *
"Same as ADZ710KN. . ‘Sune " AD2712KN performance.
l Specifications apply to both outputs of the AD2712,
'Refer to next pig: for definition of temperature-telated error specincations,
'The ADZHOLN and AD2712LN outputs are guaranteed for a maximum t 2ppmf' C temperature
coefficient over the +15°C to +25'C temperature range. Refer to Figure I.
'The +10V md -10V outputs of the AD2712 typically track within t lppmf C over the specified temperature range.
'Negative power supply not required for AD2710.
' Use of the output trim will change the temperature coefficient approximately oappmf'c for each
millivolt of adjustment.
, For outline information see Package Information section.
Specifications subject to Chung: without notice.
- 2- REV. A
Applying the 'riitiiMiiieTiji,
UNDERSTANDING THE SPECIFICATIONS
The AD2710 and AD2712 precision references are designed
for applications requiring both the lowest possible initial error
at room temperature and the lowest possible temperature drift.
The specification for initial error is relatively straight-forward,
and isthe absolute error from exactly 10.000V. The specifica-
tion for temperature drift, however, must be explained.
Various methods have been used to specify the temperature
drift of voltage references, including the "butterfly", "box",
and "modified-box" (or total error) methods. The AD2710
and AD2712 are specified with the "butterfly" method.
U_sing, three or more le_PPTat8ref_r, provides the user with a
tight.er dtift specification, eliminating possible mid-range ex-
cursions. The AD2710 and AD2712 have been designed and
characterized as having a smooth drift curve with a virtually
straight segment from +25° C to +70° C. The typical curve as
shown IS concave downward and gradually Increases slope
near 0°C.
As can be seen from Figure 1, the AD2710L and AD2712L
+10V outputs will exhibit a maximum temperatureo coefficient
of nppm/"c (t-2ppm/" c for "K'' grade) from +25° fi, to
+70° C. Over the short range between +15° C and +25° C, the
AD2710L and AD2712L +10V outputs have a maximum
drift of only tlee/o C and a maximum drift of 1sppm/" C
from o to +15° C. The negative output of the AD2712L has a
similar temperature _coeffifttht. characteristic with a maximum
slope of t,2ispm/of from +25° C to +70° C. This limit continues
from +25° C to +15 "c ayl, then Increases to a +5ppm/°C
maximum slope from +15° C and o'' C. Every unit is 100 per-
cent tested and guaranteed to meet these specifications over
the full o to o70'' C temperature range.
+2.11.
TYPICAL CURVE
AZIIIV
tt IO " 20 5 W BO W 00 N
YEUPERAYURE - IC
Figure h Maximum Change from +10V Output from +25° C
Value " Temperature
All grades of the AD2710 and AD2712 are tested after a five
minute warm-up period. This warm-up allows the entire circuit
to attain thermal equilibrium. The warm-up drift is approxi-
mately 500 microvolts and is completely settled approxi-
mately three minutes after tum-on. Figure 2 shows the
typical warm-up characteristics of the AD2710.
ti 10.01110
t, 10.0005
Ct SPECIFIED
> moooo INITIAL
ts ACCURACY
1MIN 2 MIN SHIN 4 MIN
TURN-ON
Figure 2. AD2710 Typical Warm-Up Drift
USING THE AD2710 AS A DAC REFERENCE
Digital-to-analog converters require a reference to establish
REV. A
the full scale output range. It is this reference which will ulti-
mately determine the absolute accuracy of the converter.
While many converters include internal reference sources,
better overall performance can be obtained if a higher preci-
sion external reference is used.
1m 1m RI
+1511 som
mroun arr , "w
" " mmm
" ' Austin "
92710 won 9.951. 10 10v SPAN
19-95k 0.5...A ttAC
" REF ti FT! bk OUT "0PF
m m - me 1 '
REF 3 - Abui - CODE kt 8k Wur
. us- A0609
, GND CODE INPUT 2."
s 12 " "
Vse row -----
tSV GND MSB---- L.
Figure 3. Low Drift 12-Bit D/A Con vener
Figure 3 shows the AD2710 used with the AD566A high-speed
12-bit DAC. The AD566AKD is laser trimmed for t1/4LSB
maximum nonlinearity, and exhibits a gain temperature coef-
ficient of 3ppm/°C. Use of the AD2710LN reference will
result in a worst case total gain temperature coefficient of
4ppm/°C. After initial calibration of the DAC scale factor at
room temperature, 12-bit absolute accuracy can be maintained
over the +15°C to +70°C temperature range. The high output
current capability of the AD27ttra1lows it to serve as a refer-
ence for up to 10 such converters in a system.
The resolution of the AD566A can be extended as shown in
Figure 3 by summing the output of another DAC. In this ex-
ample, an AD559 is used to provide 4 additional bits. Since
the AD559 is driven from the same AD2710 reference as the
AD566A which provides the higher-order bits, and uses a
similar internal thin-film resistor ladder, it will exhibit first-
order temperature tracking. While this circuit provides 16-bits
of resolution, it is only as accurate as the AD566A used for
the most significant bits. Use of an AD566AKD will typically - "
achieve 10.00396 accuracy (11/2LSB at 14 bits).
A D56 " "
won 101. MN SPAN
19.5k um " DAC
" m an his b." " DAC [
3 I‘lngpxCODE kt Bk mwg]
ADZTIO Et, CODE INPUT = "52.111153;
13 0 menu 20-... "
BND SB ---- LStt
" Met INPUT ms 14: zoom
- lo 10 1.. -trnA)
Vcc MV FEEDBACK -
CURRENT - I
IN IMERNALLV-
CDMPEhlttATE0 . A
" CONTROL D tt
AMP but .
REFEmCE A 1." neon:
cunnsm m
z. 51.
2 A0559
- , B a , I o In 11 "
MSS LSB
Ws "sv
INN BITS "-N
Figure 4. 16-Bit Binary DA C with A02710 Rafelience
Mll71Ml0271fl
HIGH RESOLUTION ANALOG-TO-DIGITAL CONVERSION
The AD2710 is well-suited to both system and instrument-level
analog-to-digital converter reference requirements. The excel-
lent absolute accuracy and low temperature drift allow low-
cost measurement systems to offer high levels of performance.
The AD7555 is a 4%/5% digit ADC subsystem which uses the
quad-slope conversion technique to achieve high accuracy at
AGtlD-WMtONTERTlE mm PINZI " PIN!
_ TN3ND Voc mu
lex "5" RETURN
INTEKYIE
, morn
ADZTIDLN
WLV RETURN
m DGND
NOTES:
1.uc1 VALUES SHOWN ARE FOR 51R DIGIT MODE. FOR 01/2 DIGIT MODE R. = 380k,C| I02741F,
SUIYABLE CAPACITORS AVAILABLE FROM CMPONENT RESEARCH CO. INC., 1655 26th STREET,
SANTA MONICA, CA. 90406. STOCK NWBER FOR 0.22le CAPACITOR IS DHHZIKXWI.
2. M. M. R7 1% TOLERANCE
3. RT, " SHOULD YRACK WITHIN 05me. EITHER BULK METAL OR WIREAWOUND RESISTOHS
(OR A THIM-FILM NETWORK) SHOULD BE USED. R2 SHOULD BE A LOW-TC TYPE POTENTIDMETER
OR A SELECTED LW DRIFT FIXED RESISTOR.
Figure ti. High Accuracy Low Drift A/D Converter
vou. = +1o.ooov
e Vout - -1o.ooov
A02712
CE vour - +1o,ooov
'OPT'IDNAL Ink POTENTIDMETER PROVIDES
MOmV OUTPUT TRIM. TEMPERATURE DRIFT
INCREASES 1wa PER mV DF FINE
ANUSTMENT
Figure 6. Optional Fine Trim Connections
low cost. This patented conversion process performs auto-
matic correction for offsets and other errors in the analog
circuitry as a part of each conversion. Total scale factor drift
1. 2ppml°C is possible using the AD2710L reference and medi-
um-precision external amplifiers. This represents a full scale
drift of less than 1:10 counts in +200 ,000 from +15° C to
+45° C. Less than 1 count of drift will occur in the 4 1/2
digit mode.
The AD7555 was designed for use with a 4. 096V reference,
which produces a f..2 volt Input range. When the AD2710 IS
used, the input range is increased to 14.88281V (24.4pV/
count). The new scaling can be handled either by using a preci-
sion gain stage before the AD755 5 analog input as shown or by
using a microprocessor to digitally correct the scale. The actual
input signal value can be computed by multiplying the count
produced by the AD7555 by VREFI (10 volts in this case), and
dividing the result by 409600. Details of the digital circuitry
of the AD7555 can be found on the AD7555 data sheet.
lt should be noted that when the AD7555 is used with the
AD2710 10 volt reference, it is necessary to use a Vcc greater '
than 10 volts. Thus the digital inputs and outputs of the ADC
will be compatible with CMOS logic levels.
FIN TEST
ADJUST +13 ADJUST +15v POINT n/c NIC
N/C NIC N/C N/C N/C NIC COMMON
FINE Vour FINE TEST
ADJUST " ADJUST +15v POINT N/C MIC
-10 FINE "w NIC NIC COMMON
ADJUST Vour ADJUST
Figure 7. Pin Connections (Top View)
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
IG:O..7902001 i20.06i.25l--
P"% I-. n n -. - T
(7.39)
. 0.308
s-' - s-. Id ' u s-I-
PIN NO. 1 IDENTIFIER -t- (7.39)
0200 __l
(5.08)
7‘... I
[4.33)
(7.0m'”
0.018 0.040 0.100
(0.457) (1.02) J. 54)
-4- REV. A
PRINTED IN USA.
06738—2—4/86
