Quad 12-Bit Serial
Voltage Output DAC
DAC8420
FEATURES
FUNCTIONAL BLOCK DIAGRAM
VREFHI
VDD
Guaranteed monotonic over temperature
Excellent matching between DACs
Unipolar or bipolar operation
Buffered voltage outputs
High speed serial digital interface
Reset-to-zero scale or midscale
Wide supply range, +5 V only to 15 V
Low power consumption (35 mW maximum)
Available in 16-Lead PDIP, SOIC, and CERDIP packages
5
1
DAC8420
10
SDI
REG
A
7
6
3
2
DAC A
DAC B
DAC C
DAC D
VOUTA
VOUTB
VOUTC
VOUTD
12
12
11
CS
REG
B
CLK
SHIFT
REGISTER
13
14
NC
LD
APPLICATIONS
REG
C
4
Software controlled calibration
Servo controls
Process control and automation
ATE
DECODE
REG
D
2
9
16
CLSEL CLR
8
15
4
GND
VREFLO
VSS
Figure 1.
GENERAL DESCRIPTION
asynchronously overriding the current DAC register values. The
output voltage range, determined by the inputs VREFHI and
VREFLO, is set by the user for positive or negative unipolar or
bipolar signal swings within the supplies, allowing considerable
design flexibility.
The DAC8420 is a quad, 12-bit voltage-output DAC with serial
digital interface in a 16-lead package. Utilizing BiCMOS tech-
nology, this monolithic device features unusually high circuit
density and low power consumption. The simple, easy-to-use
serial digital input and fully buffered analog voltage outputs
require no external components to achieve a specified per-
formance.
The DAC8420 is available in 16-lead PDIP, SOIC, and CERDIP
packages. Operation is specified with supplies ranging from
+5 V only to 15 V, with references of +2.5 V to 10 V, respec-
tively. Power dissipation when operating from 15 V supplies is
less than 255 mW (maximum) and only 35 mW (maximum)
with a +5 V supply.
The 3-wire serial digital input is easily interfaced to micro-
processors running at 10 MHz with minimal additional
circuitry. Each DAC is addressed individually by a 16-bit
serial word consisting of a 12-bit data word and an address
CLR
header. The user-programmable reset control
forces all
four DAC outputs to either zero scale or midscale,
Rev. B
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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