DAC-88 Series
High-Performance, 12-Bit DACs with Input Registers
FEATURES
12-Bit resolution
Integral nonlinearity error ±1/2LSB, max.
Differential nonlinearity error ±3/4LSB, max.
MIL-STD-883 high-reliability versions available
Input register
3μs fast output settling time
Guaranteed monotonicity over full temperature
range
PRODUCT OVERVIEW
INPUT/OUTPUT CONNECTIONS
The DAC-88 Series D/A converters are high
pin programmable and include 0 to +10V, ±±V,
and ±10V. The DAC-88 Series contains a precision
zener reference circuit. This eliminates code-
dependent ground currents by routing current from
the positive supply to the internal ground node
as determined by the R-2R ladder network. The
internal feedback resistors for the on-board ampli-
fier track the ladder network resistors, enhancing
temperature performance. The excellent tracking
of the resistors results in a differential nonlinearity
tempco of ±2ppm/ꢀC maximum. The temperature
coefficient of gain is ±20ppm/ꢀC maximum, and
the tempco of zero is ±±ppm/ꢀC maximum.
PIN FUNCTION
PIN FUNCTION
performance 12-bit devices with a fast settling
voltage output. They are compatible and pin-pin
replacement for the standard DAC88 and 3860
series. They incorporate a level-controlled input
storage register and are specifically designed for
systems applications such as data bus interfacing
with computers. When the “load/Register Enable”
input is high, data in the storage register is held,
and when the load input is low, data is transferred
through to the DAC. There are two basic models
available by coding option: binary and two’s com-
plement. The output voltage ranges are externally
1
BIT 1 (MSB)
BIT 2
24
23
22
21
20
19
18
17
16
1±
14
13
REFERENCE OUT
2
GAIN ADJUST
3
BIT 3
+1±V SUPPLY
GROUND
4
BIT 4
±
BIT ±
SUMMING JUNCTION
LOAD/Register Enable
10V RANGE
6
BIT 6
7
BIT 7
8
BIT 8
BIPOLAR OFFSET
REFERENCE IN
VOLTAGE OUTPUT
–1±V SUPPLY
9
BIT 9
10
11
12
BIT 10
BIT 11
BIT 12 (LSB)
+±V SUPPLY
BLOCK DIAGRAM
REF.
OUT
24
GAIN
ADJUST
23
REF.
IN
16
+15V
SUPPLY SUPPLY
–15V
+5V
SUPPLY
13
BIPOLAR
OFFSET
17
22
14
ꢀNȍ
+5V
18 10V RANGE
D/A CONVERTER
SUMMING
20
JUNCTION
LOAD 19
ꢀNȍ
VOLTAGE
15
OUTPUT
REGISTER
74LS75
REGISTER
74LS75
REGISTER
74LS75
21 GROUND
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9 10 11 12
9 10 11 12
BITS
MSB
DIGITAL INPUTS
LSB
Figure 1. DAC-88 Functional Block Diagram
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
•
Tel: (508) 339-3000
•
www.datel.com
•
e-mail: help@datel.com
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