Data Conversion Circuits – D/A and A/D Converters
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applications include waveform generators, servomotor and pen drivers, audio encoders and digitally
controlled attenuators, analogue meter drivers, programmable power supplies, high-speed modems,
CRT display drivers, etc.
12.6.2 DAC-0808
DAC-0808 is an eight-bit D/A converter featuring a full-scale output current settling time of 150 ns
while dissipating only 33 mW with ± 5 V supplies. Relative accuracies of better than ± 0.19 % ensure
eight-bit monotonocity and linearity, while zero-level output current of less than 4 mA provides eightbit zero accuracy for I ref ≥ 2 mA. It has a wide power supply voltage range of ± 4.5 V to ± 18 V. It
can interface directly with popular TTL, DTL or CMOS logic families and is a direct replacement for
the D/A converter MC 1508/MC 1408. Figure 12.15 shows the application circuit of DAC-0808 wired
as a voltage-output D/A converter.
12.6.3 DAC-80
DAC-80 is a 12-bit D/A converter. Both current and voltage-output versions are available. Its salient
features include low power dissipation (345 mW), full ± 10 V swing with ±12 V supplies, TTL
and CMOS-compatible digital inputs, ±1/2 LSB maximum nonlinearity over 0–70 °C, guaranteed
monotonocity over 0–70 °C and 4 ms settling time to ±0.01 % of full-scale and monolithic design.
Figures 12.16 and 12.17 show the pin connection diagrams of current-output and voltage-output models
of DAC-80.
DAC
0808
A 1
A 2
A 3
A 4
A 5
A 6
A 7
A 8
(MSB)
(LSB)
5K
5
6
7
8
9
10
11
12
V EE
−
+
V O
5K
4
16
2
15
14
13
3
5K
=-15V
0.1
F
μ
+V CC =5V
V o =10 (
A 1 A 2
4
2
+
A 8
256
......
(
V
(10.000V)
REF
Figure 12.15 DAC-0808 wired as a voltage-output D/A converter.