IC, SERIES V-REF, 10V, 5mV, 16-DIP

 

AD688AQ

Manufacturer Part NumberAD688AQ
DescriptionIC, SERIES V-REF, 10V, 5mV, 16-DIP
ManufacturerAnalog Devices Inc
AD688AQ datasheets

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Specifications of AD688AQ

TopologySeriesInput Voltage12V To 36V
Reference Voltage10VReference Voltage Tolerance5mV
Voltage Reference Case StyleDIPNo. Of Pins16
Temperature Coefficient3ppm/°CRohs StatusRoHS non-compliant
Reference TypeSeriesVoltage - Output±10V
Tolerance±5mVNumber Of Channels2
Current - Quiescent12mACurrent - Output10mA
Operating Temperature-40°C ~ 85°CMounting TypeThrough Hole
Package / Case16-CDIP (0.300", 7.62mm)Fixed / Adjust / ProgProgrammable
Output Voltage (max)±10VReference Voltage Accuracy (max)0.02
Line Regulation200uV/VLoad Regulation50uV/mA
Input Voltage (max)36VOperating Temp Range-40C to 85C
Operating Temperature ClassificationIndustrialMountingThrough Hole
Pin Count16Package TypeCDIP
Voltage - Input-Current - Cathode-
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FEATURES
±10 V tracking outputs
Kelvin connections
Low tracking error: 1.5 mV
Low initial error: 2.0 mV
Low drift: 1.5 ppm/°C
Low noise: 6 μV p-p
Flexible output force and sense terminals
High impedance ground sense
Wide body SOIC and CERDIP packages
GENERAL DESCRIPTION
The AD688 is a high precision ±10 V tracking reference. Low
tracking error, low initial error, and low temperature drift give
the AD688 reference absolute ±10 V accuracy performance
previously unavailable in monolithic form. The AD688 uses a
proprietary ion-implanted buried Zener diode, and laser wafer
drift trimming of high stability thin-film resistors to provide
outstanding performance.
The AD688 includes the basic reference cell and three
additional amplifiers. The amplifiers are laser-trimmed for low
offset and low drift and maintain the accuracy of the reference.
The amplifiers are configured to allow Kelvin connections to
the load and/or boosters for driving long lines or high current
loads, delivering the full accuracy of the AD688 where it is
required in the application circuit.
The low initial error allows the AD688 to be used as a system
reference in precision measurement applications requiring
12-bit absolute accuracy. In such systems, the AD688 can
provide a known voltage for system calibration; the cost of
periodic recalibration can therefore be eliminated.
Furthermore, the mechanical instability of a trimming
potentiometer and the potential for improper calibration can be
eliminated by using the AD688 and calibration software.
The AD688 is available in commercial version. Specified over
o
o
the −40
C to +85
C temperature range, the AD688 is offered in
wide body 16-lead SOIC and 16-lead CERDIP packages,
Rev. B
Information 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 that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
High Precision
±10 V Reference
FUNCTIONAL BLOCK DIAGRAM
NOISE
+10V OUT
V
REDUCTION
A3 IN
SENSE
HIGH
7
6
4
3
R
B
A1
AD688
R1
R4
R2
R5
R6
R3
A2
5
9
10
8
12
11
GND
NC
NC
GAIN
V
BAL
LOW
SENSE
ADJ
ADJ
+IN
NC = NO CONNECT
Figure 1.
PRODUCT HIGHLIGHTS
1.
Precision Tracking. The AD688 offers precision tracking
±10 V Kelvin output connections with no external
components. Tracking error is less than 1.5 mV and fine-
trim is available for applications requiring exact symmetry
between the +10 V and −10 V outputs.
2.
Accuracy. The AD688 offers 12-bit absolute accuracy
without any user adjustments. Optional fine-trim
connections are provided for applications requiring higher
precision. The fine-trimming does not alter the operating
conditions of the Zener or the buffer amplifiers and thus
does not increase the temperature drift.
3.
Low output noise. Output noise of the AD688 is low—
typically 6 μV p-p. A pin is provided for broadband noise
filtering using an external capacitor.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
© 2005 Analog Devices, Inc. All rights reserved.
AD688
+10V OUT
A3
1
FORCE
–10V OUT
14
SENSE
–10V OUT
A4
15
FORCE
+V
2
S
–V
16
S
13
A4 IN
www.analog.com

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AD688AQ Summary of contents

  • Page 1

    FEATURES ±10 V tracking outputs Kelvin connections Low tracking error: 1.5 mV Low initial error: 2.0 mV Low drift: 1.5 ppm/°C Low noise: 6 μV p-p Flexible output force and sense terminals High impedance ground sense Wide body SOIC and ...

  • Page 2

    AD688 TABLE OF CONTENTS Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Theory of Operation ........................................................................ 6 Applications....................................................................................... 7 Calibration..................................................................................... 7 Noise Performance and Reduction ............................................ 8 REVISION HISTORY 3/05—Rev Rev. ...

  • Page 3

    ... Gain and balance adjustments guaranteed capable of trimming output voltage error and symmetry error to zero. 3 Test Conditions +18 V, −V = – +13.5 V, − Specifications shown in boldface are tested on all production units at AD688AQ AD688BQ Min Typ Max Min Typ −5 +5 −2 −3 +3 −1.5 ± ...

  • Page 4

    AD688 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Rating +V to − Power Dissipation (25°C) Q Package 600 mW Storage Temperature −65°C to +150°C Lead Temperature +300°C (Soldering Package Thermal Resistance Q (θ /θ ) ...

  • Page 5

    PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 3. Pin Function Descriptions Pin No. Mnemonic Description 1 +10 V OUT FORCE +10 V Output with Kelvin Force. Connect to Pin Positive Power Supply +10 V OUT SENSE ...

  • Page 6

    AD688 THEORY OF OPERATION The AD688 consists of a buried Zener diode reference, amplifiers and associated thin-film resistors as shown in Figure 3. The temperature compensation circuitry provides the device with a temperature coefficient of 1.5 ppm/°C or less. Amplifier ...

  • Page 7

    APPLICATIONS The AD688 can be configured to provide ±10 V reference outputs as shown in Figure 4. The architecture of the AD688 provides ground sense and uncommitted output buffer amplifiers which offer the user a great deal of functional flexibility. ...

  • Page 8

    AD688 NOISE PERFORMANCE AND REDUCTION The noise generated by the AD688 is typically less than 6 µV p-p over the 0 band. Noise MHz bandwidth is approximately 840 µV p-p. The dominant source ...

  • Page 9

    ... T TEMPERATURE (°C) MIN Figure 11. Typical AD688AQ Temperature Drift Each AD688A and B grade unit is tested at −40°C, −25°C, 0°C, +25°C, +50°C, +70°C, and +85°C. This approach ensures that the variations of output voltage that occur as the temperature changes within the specified range will be contained within a box whose diagonal has a slope equal to the maximum specified drift ...

  • Page 10

    AD688 100 80 GAIN 60 40 PHASE 20 0 –20 10 100 1k 10k 100k FREQUENCY (Hz) Figure 14. A3, A4 Open-Loop Frequency Response 110 V V 100 100 1k 10k FREQUENCY (Hz) Figure ...

  • Page 11

    DYNAMIC PERFORMANCE The output buffer amplifiers (A3 and A4) are designed to provide the AD688 with static and dynamic load regulation superior to less complete references. Many A/D and D/A converters present transient current loads to the reference, and poor ...

  • Page 12

    AD688 V OUT A4 1kΩ + 10V 10V V L – 0V Figure 27. Load Crosstalk Test Circuit 1mV 5V 100 90 V OUT Figure 28. Load Crosstalk Attempts to drive a large capacitive load (in ...

  • Page 13

    ... OUTLINE DIMENSIONS 0.200 (5.08) 0.200 (5.08) 0.125 (3.18) 0.30 (0.0118) 0.10 (0.0039) COPLANARITY ORDERING GUIDE Initial Temperature Model Error Coefficient AD688AQ ppm/°C AD688BQ ppm/°C 1 AD688ARWZ ppm/° Pb-free part. 0.005 0.098 (2.49) 0.310 (7.87) (0.13) MAX MIN 0.220 (5.59) ...

  • Page 14

    AD688 NOTES Rev Page ...

  • Page 15

    NOTES Rev Page AD688 ...

  • Page 16

    AD688 NOTES © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C00815-0-3/05(B) Rev Page ...

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