Datasheet
AD588
Rev. L | Page 15 of 20
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.
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).
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 V
CT
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.
00531-032
R3
R
B
R1
R2
R4
R5
R6
–V
S
+V
S
A1
A4
AD588
A3
14-BIT DAC
LS
INPUT
REGISTER
MS
INPUT
REGISTER
DAC REGISTER
V
REFS
V
REF
AGNDS
AGNDF
+10V
N.C.
V
DD
R
FS
I
OUT
LDAC
CSLSB
CSMSB
WR
V
SS
DGNDDB0DB13
14
AD7535
1
14
15
2
16
1
2
5
6
131112
8
1095
346
7
28 26
3
4
23
24
22
25
821727
A2
Figure 32. AD588/AD7535 Connections
00531-033
A1
A3
A2
A4
AD588
A
3
+ IN
10kΩ
V
L
–5V
V
CT
+5V
V
H
10kΩ
+V
REF
FORCE
T
A
P
S
E
L
E
C
T
O
R
8 MSBs 8 LSBs
GND
DB15
DB0
HBE LBE
V
OUT
–5V TO
+5V
+12V
–12V
+V
S
–V
S
S
E
G
M
E
N
T
S
E
L
E
C
T
O
R
LATCHES
AD569
+V
REF
SENSE
–V
REF
FORCE
–V
REF
SENSE
LDAC
CS
A
3
– IN
A
3
OUT
A
2
+ IN
A
2
– IN
A
4
+ IN
A
4
– IN
A
4
OUT
813
216 64
1
3
12
11
10
9
14
15
3
2
16
15
1
28
17
13 14 12 9 7 4 19 22 24 27 8 23
18
Figure 33. High Accuracy ±5 V Tracking Reference for AD569