Data Sheet
AD588
USING THE AD588 WITH CONVERTERS
The AD588 is an ideal reference for a wide variety of analog-to-
digital and digital-to-analog converters. Several representative
examples follow.
AD569 16-BIT DIGITAL-TO-ANALOG CONVERTER
Another application that fully utilizes the capabilities of the AD588
is supplying a reference for the AD569, as shown in Figure 33.
Amplifier A2 senses system common and forces VCT to assume this
value, producing +5 V and −5 V at Pin 6 and Pin 8, respectively.
Amplifier A3 and Amplifier A4 buffer these voltages out to the
appropriate reference force-sense pins of the AD569. The full
Kelvin scheme eliminates the effect of the circuit traces or wires and
the wire bonds of the AD588 and AD569 themselves, which would
otherwise degrade system performance.
AD7535 14-BIT DIGITAL-TO-ANALOG CONVERTER
High resolution CMOS digital-to-analog converters require a
reference voltage of high precision to maintain rated accuracy.
The combination of the AD588 and AD7535 takes advantage of
the initial accuracy, drift, and full Kelvin output capability of the
AD588, as well as the resolution, monotonicity, and accuracy of the
AD7535 to produce a subsystem with outstanding characteristics
(see Figure 32).
V
N.C.
28
DD
26
V
REFS
1
2
3
4
R
I
FS
7
6
4
3
14-BIT DAC
14
OUT
V
+10V
REF
A3
A4
1
R
B
AD7535
A1
R1
AD588
AGNDS
AGNDF
14
15
5
6
R4
R5
DAC REGISTER
23
24
LDAC
R2
MS
LS
CSLSB
INPUT
INPUT
REGISTER
REGISTER
+V
2
S
R6
R3
22
25
CSMSB
WR
A2
16 –V
S
5
9
10
8
12
11
13
8
21
7
27
DB13
DB0 DGND
V
SS
Figure 32. AD588/AD7535 Connections
+12V
–12V
+V
S
–V
S
28
1
2
16
6
4
A
+ IN
3
V
H
A
OUT
3
+V
REF
FORCE
1
3
2
A3
+V
REF
SENSE
AD569
A
– IN
+5V
3
3
A1
S
E
L
E
C
T
12
11
S
E
L
E
C
T
10kΩ
10kΩ
S
E
G
M
E
N
T
V
CT
V
T
A
P
OUT
17
–5V TO
+5V
A
– IN
+ IN
2
10
9
A2
O
R
O
R
A
2
–V
SENSE
REF
A
– IN
–5V
4
14
15
16
15
A
4
–V
FORCE
AD588
REF
OUT
A4
V
A
+ IN
L
4
8
13
8 MSBs
8 LSBs
LATCHES
18
GND
13
14
12
9
7
4
19 22 24 27
8
23
CS LDAC
HBE LBE
DB0
DB15
Figure 33. High Accuracy 5 V Tracking Reference for AD569
Rev. M | Page 15 of 20
ADI [ ADI ]
