DAC8718 Datasheet, PDF (1/60 Pages) Texas Instruments – Octal, 16-Bit, Low-Power, High-Voltage Output, Serial Input DIGITAL-TO-ANALOG CONVERTER

DAC8718
DAC8718
DAC8718
www.ti.com
SBAS467A – MAY 2009 – REVISED DECEMBER 2009
Octal, 16-Bit, Low-Power, High-Voltage Output, Serial Input
DIGITAL-TO-ANALOG CONVERTER
Check for Samples: DAC8718
FEATURES
1
•2345 Bipolar Output: ±2V to ±16.5V
• Unipolar Output: 0V to +33V
• 16-Bit Resolution
• Low Power: 14.4mW/Ch (Bipolar Supply)
• Relative Accuracy: 4 LSB Max
• Low Zero/Full-Scale Error
– Before User Calibration: ±10 LSB Max
– After User Calibration: ±1 LSB
• Flexible System Calibration
• Low Glitch: 4nV-s
• Settling Time: 15μs
• Channel Monitor Output
• Programmable Gain: x4/x6
• Programmable Offset
• SPI™: Up to 50MHz, 1.8V/3V/5V Logic
• Schmitt Trigger Inputs
• Daisy-Chain with Sleep Mode Enhancement
• Packages: QFN-48 (7x7mm), TQFP-64
(10x10mm)
APPLICATIONS
• Automatic Test Equipment
• PLC and Industrial Process Control
• Communications
IOVDD DGND DVDD
AVDD
AVSS
REF-A
WAKEUP
SCLK
CS
SDI
SDO
RST
RSTSEL
LDAC
CLR
USB/BTC
GPIO-0
GPIO-1
GPIO-2
AIN-0
AIN-1
DAC8718
Reference
Buffer A
Command
Registers
To DAC-0, DAC-1,
DAC-2, DAC-3
(When Correction Engine Disabled)
OFFSET
DAC A
Analog Monitor
VOUT-0
VOUT-7
AIN-0
AIN-1
Ref Buffer A
Ref Buffer B
OFFSET-B
Input Data
Register 0
Correction
Engine
User Calibration:
Zero Register 0
Gain Regsiter 0
DAC-0
Data
DAC-0
Latch-0
LDAC
To DAC-0, DAC-1,
DAC-2, DAC-3
Internal Trimming
Zero/Gain; INL
To DAC-4, DAC-5, DAC-6, DAC-7
(Same Function Blocks
for All Channels)
Reference
Buffer B
OFFSET
DAC B
Power-Up/
Power-Down
Control
VMON
OFFSET-A
VOUT-0
AGND-A
OFFSET-B
AGND-B
VOUT-7
DGND DVDD
AVDD
AVSS
REF-B
DESCRIPTION
The DAC8718 is a low-power, octal, 16-bit
digital-to-analog converter (DAC). With a 5V
reference, the output can either be a bipolar ±15V
voltage when operating from dual ±15.5V (or higher)
power supplies, or a unipolar 0V to +30V voltage
when operating from a +30.5V (or higher) power
supply. With a 5.5V reference, the output can either
be a bipolar ±16.5V voltage when operating from dual
±17V (or higher) power supplies, or a unipolar 0V to
+33V voltage when operating from a +33.5V (or
higher) power supply. This DAC provides low-power
operation, good linearity, and low glitch over the
specified temperature range of –40°C to +105°C. This
device is trimmed in manufacturing and has very low
zero-code and gain error. In addition, system level
calibration can be performed to achieve ±1 LSB
bipolar zero/full-scale error with bipolar supplies, or
±1 LSB zero code/full-scale error with a unipolar
supply, over the entire signal chain. The output range
can be offset by using the DAC offset register.
The DAC8718 features a standard, high-speed serial
peripheral interface (SPI) that operates at up to
50MHz and is 1.8V, 3V, and 5V logic compatible, to
communicate with a DSP or microprocessor. The
input data of the device are double-buffered. An
asynchronous load input (LDAC) transfers data from
the DAC data register to the DAC latch. The
asynchronous CLR input sets the output of all eight
DACs to AGND. The V_MON pin is a monitor output
that connects to the individual analog outputs, the
offset DAC, the reference buffer outputs, and two
external inputs through a multiplexer (mux).
The DAC8718 is pin-to-pin and function-compatible
with the DAC8218 (14-bit) and the DAC7718 (12-bit).
1
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.
DSP is a trademark of Texas Instruments.
2
SPI, QSPI are trademarks of Motorola Inc.
3
Microwire is a trademark of National Semiconductor.
4
All other trademarks are the property of their respective owners.
5
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 © 2009, Texas Instruments Incorporated