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.
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.
N.C.
V DD
7
6
4
3
V REFS
1
28
26
3
R FS
14-BIT DAC
4
I OUT
R B
A1
R1
R4
AD588
A3
1
14
+10V V REF
AGNDS
2
5
14
AD7535
DAC REGISTER
23 LDAC
R3
5
R2
A2
9
10
8
R5
12
R6
11
13
A4
15
2 +V S
16 –V S
AGNDF
6
MS
INPUT
REGISTER
LS
INPUT
REGISTER
24 CSLSB
22 CSMSB
25 WR
8
DB13
21
DB0
7
DGND
27
V SS
Figure 32. AD588/AD7535 Connections
2
16
V H
6
4
A 3 + IN
A3
A 3
OUT
1
3
+V REF
FORCE
1
+V S
28
–V S
+12V
–12V
A 3 – IN
3
+5V
2
+V REF
SENSE
AD569
A1
AD588
10k ?
10k ?
A2
A4
A 2 – IN
A 2 + IN
A 4 – IN
A 4
OUT
12
11
10
9
14
15
V CT
–5V
16
15
–V REF
SENSE
–V REF
FORCE
S
E
G
M
E
N
T
S
E
L
E
C
T
O
R
T
A
P
S
E
L
E
C
T
O
R
17
V OUT
–5V TO
+5V
V L
8
13
A 4 + IN
8 MSBs
8 LSBs
GND 18
LATCHES
13
14
12
9
7
4
1 9 2 2
2 4 2 7
8
23
CS LDAC
DB15
DB0
HBE LBE
Figure 33. High Accuracy ±5 V Tracking Reference for AD569
Rev. L | Page 15 of 20
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