Data Sheet
FEATURES
Low drift: 1.5 ppm/°C
Low initial error: 1 mV
Pin programmable output
+10 V, +5 V, ±5 V tracking, −5 V, −10 V
Flexible output force and sense terminals
High impedance ground sense
16-lead SOIC package and 16-lead CERDIP
MIL-STD-883-compliant versions available
Multiple Output, High Precision,
Dual-Tracking Reference
AD588
FUNCTIONAL BLOCK DIAGRAM
NOISE
REDUCTION
7
V
HIGH
6
A3 IN
4
A3 OUT
SENSE
3
A3
R
B
A1
1
A3 OUT
FORCE
14
R1
R4
A4
R5
15
A4 OUT
SENSE
A4 OUT
FORCE
GENERAL DESCRIPTION
The
represents a major advance in state-of-the-art
monolithic voltage references. Low initial error and low
temperature drift give the
absolute accuracy performance
previously not available in monolithic form. The
uses a
proprietary ion-implanted, buried Zener diode and laser-wafer
drift trimming of high stability thin film resistors to provide
outstanding performance.
The
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 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
where it is required in the application circuit.
The low initial error allows the
to be used as a system
reference in precision measurement applications requiring
12-bit absolute accuracy. In such systems, the
can provide a
known voltage for system calibration in software. The low drift
also 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
in conjunction with auto calibration software.
The
is available in seven versions. The
and
are packaged in a 16-lead CERDIP and are specified
for 0°C to +70°C operation. The
and
are
packaged in a 16-lead CERDIP, and the
is packaged
in a 16-lead SOIC, and they are specified for the −25°C to +85°C
industrial temperature range. The ceramic
and
grades are specified for the full military/aerospace
temperature range.
R3
R2
R6
A2
2
+V
S
–V
S
AD588
16
10
8
12
11
13
5
9
GAIN
ADJ
GND
GND
SENSE SENSE
–IN
+IN
V
LOW
BAL
ADJ
V
CT
A4 IN
Figure 1.
PRODUCT HIGHLIGHTS
1.
The
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 so does not increase
the temperature drift.
Output noise of the
is very low, typically 6 µV p-p.
A pin is provided for additional noise filtering using an
external capacitor.
A precision ±5 V tracking mode with Kelvin output
connections 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.
Pin strapping capability allows configuration of a wide
variety 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.
2.
3.
4.
Rev. M
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00531-001
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