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PDF AD588 Data sheet ( Hoja de datos )
| Número de pieza | AD588 | |
| Descripción | High Precision Voltage Reference | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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High Precision Voltage Reference
AD588*
FEATURES
Low Drift: 1.5 ppm/؇C
Low Initial Error: 1 mV
Pin Programmable Output:
+10 V, +5 V, +65 V Tracking, –5 V, –10 V
Flexible Output Force and Sense Terminals
High Impedance Ground Sense
Machine lnsertable DIP Packaging
MIL-STD-883 Compliant Versions Available
GENERAL DESCRIPTION
The AD588 represents a major advance in the state-of-the-art
in monolithic voltage references. Low initial error and low tem-
perature drift give the AD588 absolute accuracy performance
previously not available in monolithic form. The AD588 uses a
proprietary ion-implanted buried Zener diode, and laser-wafer-
drift trimming of high stability thin-film resistors to provide
outstanding performance at low cost.
The AD588 includes the basic reference cell and three additional
amplifiers that provide pin programmable output ranges. The
amplifiers are laser-trimmed for low offset and low drift to main-
tain the accuracy of the reference. The amplifiers are configured
to allow Kelvin connections to the load and/or boosters for driv-
ing long lines or high current loads, delivering the full accuracy
of the AD588 where it is required in the application circuit.
The low initial error allows the AD588 to be used as a system
reference in precision measurement applications requiring 12-bit
absolute accuracy. In such systems, the AD588 can provide a
known voltage for system calibration in software, and the low
drift allows compensation for the drift of other components in
a system. Manual system calibration and 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 AD588 in conjunction with autocalibration software.
The AD588 is available in four versions. The AD588JQ and
AD588KQ and grades are packaged in a 16-lead CERDIP and
are specified for 0°C to 70°C operation. AD588AQ and BQ
grades are packaged in a 16-lead CERDIP and are specified for
the –25°C to +85°C industrial temperature range.
FUNCTIONAL BLOCK DIAGRAM
NOISE
REDUCTION
A3 OUT
VHIGH A3 IN SENSE
RB
A1
R1
R2
R3
A2
R4
R5
R6
A3
A3 OUT
FORCE
A4 OUT
SENSE
A4
A4 OUT
FORCE
AD588
+VS
–VS
GAIN GND GND
ADJ SENSE SENSE
+IN –IN
VLOW BAL VCT A4 IN
ADJ
PRODUCT HIGHLIGHTS
1. The AD588 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.
2. Output noise of the AD588 is very low—typically 6 µV p-p.
A pin is provided for additional noise filtering using an exter-
nal capacitor.
3. A precision ± 5 V tracking mode with Kelvin output connec-
tions is available with no external components. Tracking error
is less than 1 mV and a fine-trim is available for applications
requiring exact symmetry between the +5 V and –5 V outputs.
4. Pin strapping capability allows configuration of a wide vari-
ety of outputs: ± 5 V, +5 V, +10 V, –5 V, and –10 V dual
outputs or +5 V, –5 V, +10 V, and –10 V single outputs.
*Protected by Patent Number 4,644,253.
REV. D
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. 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 companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703 © 2003, Analog Devices, Inc. All rights reserved.
1 page  
AD588
Range
+10 V
–5 V or +5 V
–10 V
+5 V
Table I. Pin Connections
Connect
Pin 10 Unbuffered* Output on Pins
to Pin: –10 V –5 V 0 V +5 V +10 V
8 8 11 6
11 8 11 6
6 8 11 6
11 6
Buffered
Output
Connections
Buffered Output on Pins
–10 V –5 V 0 V +5 V
11 to 13, 14 to 15
6 to 4, and 3 to 1
8 to 13, 14 to 15,
6 to 4, and 3 to 1
8 to 13, 14 to 15,
11 to 4, and 3 to 1 1
6 to 4 and 3 to 1
15
15
15
1
1
+10 V
1
–5 V 11
8
*Unbuffered outputs should not be loaded.
8 to 13 and 14 to 15
15
Figure 2b shows GAIN and BALANCE trims in a +5 V and
–5 V tracking configuration. A 100 kΩ 20-turn potentiometer is
used for each trim. The potentiometer for GAIN trim is con-
nected between Pin 6 (VHIGH) and Pin 8 (VLOW) with the wiper
connected to Pin 5 (GAIN ADJ). The potentiometer is adjusted
to produce exactly 10 V between Pin 1 and Pin 15, the amplifier
outputs. The BALANCE potentiometer, also connected between
Pin 6 and Pin 8 with the wiper to Pin 12 (BAL ADJ), is then
adjusted to center the span from +5 V to –5 V.
Trimming in other configurations works in exactly the same
manner. When producing +10 V and +5 V, GAIN ADJ is used
to trim +10 V and BAL ADJ is used to trim +5 V. In the –10 V
and –5 V configuration, GAIN ADJ is again used to trim the
magnitude of the span, –10 V, while BAL ADJ is used to trim
the center tap, –5 V.
In single output configurations, GAIN ADJ is used to trim outputs
utilizing the full span (+10 V or –10 V), while BAL ADJ is used
to trim outputs using half the span (+5 V or –5 V).
Input impedance on both the GAIN ADJ and BAL ADJ pins is
approximately 150 kΩ. The GAIN ADJUST trim network
effectively attenuates the 10 V across the trim potentiometer
by a factor of about 1500 to provide a trim range of –3.5 mV to
+7.5 mV with a resolution of approximately 550 µV/turn
(20-turn potentiometer). The BAL ADJ trim network attenu-
ates the trim voltage by a factor of about 1400, providing a
trim range of ± 4.5 mV with resolution of 450 µV/turn.
RB
A1
R1
R2
R3
A2
R4
R5
R6
A3
A4
+VS
AD588
–VS
SYSTEM
GROUND
Figure 2a. +10 V Output
NOISE
1F REDUCTION
+15V
+10V
+5V
+15V
0.1F
SYSTEM
GROUND
0.1F
–15V
RB
A1
R1 R4
A3
+5V
R2
R3
A2
R5
R6
A4
+VS
AD588
–VS
–5V
–15V
0.1F
SYSTEM
GROUND
0.1F
–15V
SYSTEM
GROUND
100k⍀
20T
BALANCE
ADJUST
100k⍀
20T
GAIN ADJUST
Figure 2b. +5 V and –5 V Outputs
REV. D
–5–
5 Page 
RB
A1
R1
R2
R3
A2
AD588
R4
R5
R6
VREFS
+10V
A3 VREFF
AGNDS
AGNDF
A4
+VS
–VS
N.C.
VDD
14-BIT DAC
14
AD7535
AD588
RFS
IOUT
DAC REGISTER
6
MS
INPUT
REGISTER
8
LS
INPUT
REGISTER
LDAC
CSLSB
CSMSB
WR
DB13
Figure 20. AD588/AD7535 Connections
DB0 DGND VSS
VH A3 + IN A3
OUT
A3
A3 – IN
+5V
A1
10k⍀
VCT
+VREF
FORCE
+VREF
SENSE
AD588
10k⍀
A2 – IN
A2 A2 + IN
A4 – IN
–VREF
–5V SENSE
A4
A4 OUT
–VREF
FORCE
+VS
S
E
G
M
E
N
T
S
E
L
E
C
T
O
R
+12V
–12V
–VS
AD569
S
E
TL
AE
PC
T
O
R
VOUT
–5V TO
+5V
VL A4 + IN
GND
8 MSBs
8 LSBs
LATCHES
CS LDAC
DB15
HBE LBE
DB0
Figure 21. High Accuracy ±5 V Tracking Reference for AD569
REV. D
–11–
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AD588.PDF ] | |
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