DAC8812 Datasheet, PDF (1/18 Pages) Texas Instruments – Dual, Serial Input 16-Bit Multiplying Digital-to-Analog Converter

DAC8812
DAC8812
www.ti.com
SBAS349A – AUGUST 2005 – REVISED DECEMBER 2005
Dual, Serial Input 16-Bit Multiplying Digital-to-Analog Converter
FEATURES
• Relative Accuracy: 1 LSB Max
• Differential Nonlinearity: 1 LSB Max
• 2-mA Full-Scale Current ±20%,
with V_REF = ±10 V
• 0.5 µs Settling Time
• Midscale or Zero-Scale Reset
• Separate 4Q Multiplying Reference Inputs
• Reference Bandwidth: 10 MHz
• Reference Dynamics: –105 dB THD
• SPI™-Compatible 3-Wire Interface:
50 MHz
• Double Buffered Registers Enable
• Simultaneous Multichannel Change
• Internal Power On Reset
• Industry-Standard Pin Configuration
APPLICATIONS
• Automatic Test Equipment
• Instrumentation
• Digitally Controlled Calibration
SDI
CLK
CS
D0
D1
D2
D3
D4
D5 16
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
A0
A1
EN
DAC ^A
B
Decode
Input
Register _R
Input
Register R
Power-On
Reset
DESCRIPTION
The DAC8812 is a dual, 16-bit, current-output
digital-to-analog converter (DAC) designed to operate
from a single +2.7 V to +5.5 V supply.
The applied external reference input voltage V_REF
determines the full-scale output current. An internal
feedback resistor (R_FB) provides temperature tracking
for the full-scale output when combined with an
external I-to-V precision amplifier.
A double-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
simultaneous 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 MSB pin allows system
reset assertion (RS) to force all registers to zero code
when MSB = 0, or to half-scale code when MSB = 1.
The DAC8812 is available in an TSSOP-16 package.
V_REFA B
DAC A
Register _R
DAC A
R_FBA
I_OUTA
A_GNDA
DAC B
Register R
DAC B
R_FBB
I_OUTB
A_GNDB
DGND
RS MSB
LDAC
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SPI is a trademark of Motorola, Inc.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005, Texas Instruments Incorporated