AD7398 Datasheet, PDF (1/16 Pages) Analog Devices – Quad, Serial-Input 12-Bit/10-Bit DACs

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FEATURES
AD7398—12-Bit Resolution
AD7399—10-Bit Resolution
Programmable Power Shutdown
Single (3 V to 5 V) or Dual (؎5 V) Supply Operation
3-Wire Serial SPI-Compatible Interface
Internal Power ON Reset
Double Buffered Registers for Simultaneous
Multichannel DAC Update
Four Separate Rail-to-Rail Reference Inputs
Thin Profile TSSOP-16 Package Available
Low Tempco 1.5 ppm/؇C
APPLICATIONS
Automotive Output Voltage Span
Portable Communications
Digitally Controlled Calibration
PC Peripherals
GENERAL DESCRIPTION
The AD7398/AD7399 family of quad, 12-bit/10-bit, voltage-
output digital-to-analog converters is designed to operate from a
single 3 V to 5 V or a dual ±5 V supply. Built with Analog’s robust
CBCMOS process, this monolithic DAC offers the user low
cost, and ease-of-use in single or dual-supply systems.
The applied external reference V_REF determines the full-scale
output voltage. Valid V_REF values include V_SS < V_REF < V_DD that
result in a wide selection of full-scale outputs. For multiplying
applications ac inputs can be as large as ± 5 V_P.
A doubled-buffered serial-data interface offers high-speed,
3-wire, SPI and microcontroller-compatible inputs using serial-
data-in (SDI), clock (CLK), and a chip-select (CS). A common
level-sensitive load-DAC strobe (LDAC) input allows simulta-
neous update of all DAC outputs from previously loaded Input
Registers. Additionally, an internal power ON reset forces the
output voltage to zero at system turn ON. An external asynchro-
nous reset (RS) also forces all registers to the zero code state. A
programmable power-shutdown feature reduces power dissipa-
tion on unused DACs.
Both parts are offered in the same pinout to enable users to
select the appropriate resolution for their application without
redesigning the layout. For 8-bit resolution applications see the
pin compatible AD7304 product.
The AD7398/AD7399 is specified over the extended industrial
(–40°C to +125°C) temperature range. Parts are available in
wide body SOIC-16 and ultracompact thin 1.1 mm TSSOP-
16 packages.
Quad, Serial-Input
12-Bit/10-Bit DACs
AD7398/AD7399
FUNCTIONAL BLOCK DIAGRAM
V_DD
V_REFB V_REFA
SERIAL
REGISTER
CS
SDI
CLK
INPUT
REG A
DAC A
REGISTER
DAC A
INPUT
REG B
DAC B
REGISTER
DAC B
INPUT
REG C
DAC C
REGISTER
DAC C
V_OUTA
V_OUTB
V_OUTC
12/10
POWER
ON RESET
INPUT
REG D
DAC D
REGISTER
DAC D
V_OUTD
V_SS
RS
LDAC ^VREF^{C V}REF^{D GND}
0.50
0.40
0.30
0.20
V_DD = +5V
V_SS = –5V
V_REF = +2.5V
T_A = 25؇C
0.10
0
–0.10
–0.20
–0.30
–0.40
–0.50
0
512 1024 1536 2048 2560 3072 3584 4096
CODE – Decimal
Figure 1. AD7398 DNL vs. Code (T_A = 25°C)
REV. 0
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