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PDF AD688 Data sheet ( Hoja de datos )
| Número de pieza | AD688 | |
| Descripción | High Precision +-10 V Reference | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD688 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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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
the −40oC to +85oC temperature range, the AD688 is offered in
wide body 16-lead SOIC and 16-lead CERDIP packages,
High Precision
±10 V Reference
AD688
FUNCTIONAL BLOCK DIAGRAM
NOISE
REDUCTION
7
VHIGH
6
+10V OUT
A3 IN SENSE
43
RB
A1
R1
R2
R3
A2
AD688
R4
R5
R6
A3
A4
5
GAIN
ADJ
9
GND
SENSE
+IN
10 8 12 11
NC VLOW BAL NC
ADJ
NC = NO CONNECT
13
A4 IN
Figure 1.
1
+10V OUT
FORCE
14
–10V OUT
SENSE
15
–10V OUT
FORCE
2 +VS
16 –VS
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.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.
1 page  
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
AD688
+10V OUT FORCE 1
16 –VS
+VS 2
15 –10V OUT FORCE
+10V OUT SENSE 3 AD688 14 –10V OUT SENSE
A3 IN 4 TOP VIEW 13 A4 IN
GAIN ADJ 5 (Not to Scale) 12 BAL ADJ
VHIGH 6
NOISE REDUCTION 7
11 NC
10 NC
VLOW 8
9 GND SENSE +IN
NC = NO CONNECT
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. Mnemonic
Description
1 +10 V OUT FORCE +10 V Output with Kelvin Force. Connect to Pin 3.
2 +VS
Positive Power Supply.
3
+10 V OUT SENSE
+10 V Output with Kelvin Sense. Connect to Pin 1.
4 A3 IN
+ Input to A3. Connect to VHIGH, Pin 6.
5 GAIN ADJ
Reference Gain Adjustment for Calibration. See the Calibration section.
6 VHIGH
Unbuffered Reference High Output.
7 NOISE REDUCTION Noise Filtering Pin. Connect external 1 µF capacitor to ground to reduce output noise, see the
Noise Performance and Reduction section. May be left open.
8 VLOW
Unbuffered Reference Low Output.
9
GND SENSE +IN
Gound with Kelvin Sense.
10 NC
No Connection. Leave floating.
11 NC
No Connection. Leave floating.
12 BAL ADJ
Reference Centering Adjustment for Calibration. See the Calibration section.
13 A4 IN
+ Input to A4. Connect to VLOW, Pin 8.
14
−10 V OUT SENSE
−10 V Output with Kelvin Sense. Connect to Pin 15.
15 −10 V OUT FORCE −10 V Output with Kelvin Force. Connect to Pin 14.
16 −VS
Negative Power Supply.
Rev. B | Page 5 of 16
5 Page 
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 reference response can degrade the
converter’s performance.
Figure 20, Figure 21, and Figure 22 display the characteristic of
the AD688 output amplifier driving a 0 mA to 10 mA load.
A3 OR A4
VOUT
IL 1kΩ
10V VL 10V
0V
Figure 20. Transient Load Test Circuit
200mV
100
90
5V
500ns
VOUT
10
VL
Figure 21. Large-Scale Transient Response
1mV
100
90
5V
2µs
VOUT
10
0%
VL
Figure 22. Fine-Scale Settling for Transient Load
Figure 23 and Figure 24 display the output amplifier
characteristic driving a 5 mA to 10 mA load, a common
situation found when the reference is shared among multiple
converters or is used to provide bipolar offset current.
AD688
A3 OR A4
+
10V
–
IL 2kΩ
VOUT
2kΩ
VL 10V
0V
Figure 23. Transient and Constant Load Test Circuit
1mV
VOUT 100
1mV/CM 90
200mV
1µs
VOUT
200mV/
CM
10
0%
VL
5V
Figure 24. Transient Response 5 mA to 10 mA Load
In some applications, a varying load may be both resistive and
capacitive in nature, or may be connected to the AD688 by a
long capacitive cable. Figure 25 and Figure 26 display the output
amplifier characteristics driving a 1000 pF, 0 mA to 10 mA load.
VOUT
1000pF
1kΩ
10V
CL
VL
10V
0V
Figure 25. Capacitive Load Transient Response Test Circuit
200mV
100
CL = 0 90
1µs
CL =
1000pF
10
0%
VL
5V
Figure 26. Output Response with Capacitive Load
Figure 27 and Figure 28 display the crosstalk between output
amplifiers. The top trace shows the output of A4, dc-coupled
and offset by 10 V, while the output of A3 is subjected to a 0 mA
to 10 mA load current step. The transient at A4 settles in about
1 µs, and the load-induced offset is about 100 µV.
Rev. B | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AD688.PDF ] | |
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