DAC8234 Datasheet, PDF (1/41 Pages) Texas Instruments – Quad 14-Bit High-Accuracy ±16V Output Serial Input DIGITAL-TO-ANALOG CONVERTER

DAC8234
DAC8234
DAC8234
www.ti.com ........................................................................................................................................... SBAS464A – AUGUST 2009 – REVISED SEPTEMBER 2009
Quad, 14-Bit, High-Accuracy, ±16V Output, Serial Input
DIGITAL-TO-ANALOG CONVERTER
FEATURES
1
•2345 Bipolar Output: Up to ±16V
• Unipolar Output: 0V to +20V
• 14-Bit Monotonic
• Relative Accuracy: 0.5 LSB Max
• Low Zero and Gain Errors
– Before User Calibration: 1 LSB
– After User Calibration:
0.031 LSB Zero Error, 0.25 LSB Gain Error
• Low Noise: 60nV/√Hz
• Settling Time: 6µs
• Configurable Gain: x2/x4
• Analog Output Monitor
• Power-Down Mode
• SPI™: Up to 50MHz, 1.8V/3V/5V Logic
• Daisy-Chain Mode
• Operating Temperature: –40°C to +105°C
• Packages: QFN-40 (6x6mm), TQFP-48 (7x7mm)
APPLICATIONS
• Automatic Test Equipment
• Instrumentation
• Industrial Process Control
• Communications
IOVDD
DAC8234
DGND
CS
SCLK
SDI
SDO
SPI
Shift
Register
Input
Control
Logic
RST
UNI/BIP-A
UNI/BIP-B
LDAC
GPIO-0
GPIO-1
AIN
Control
Logic
DVDD
AGND
AVDD
AVSS
REF-A
REFGND-A
Command Register
DAC Register 0
DAC Register 1
DAC Register 2
DAC Register 3
Reference Buffer A
Analog
Monitor
Zero Register 0
Gain Register 0
14-Bit DAC
Zero Register 1
Gain Register 1
14-Bit DAC
Zero Register 2
Gain Register 2
14-Bit DAC
14-Bit DAC
Zero Register 3
Gain Register 3
Reference Buffer B
Power-Down
Control Logic
VMON
RFB1-0
RFB2-0
VOUT-0
SGND-0
RFB1-1
RFB2-1
VOUT-1
SGND-1
RFB1-2
RFB2-2
VOUT-2
SGND-2
RFB1-3
RFB2-3
VOUT-3
SGND-3
REF-B
REFGND-B
DESCRIPTION
The DAC8234 is a high-accuracy, quad-channel,
14-bit digital-to-analog converter (DAC) that operates
from supply voltages of ±5V to ±18V in bipolar output
mode, and from ±5V to +24V/–12V in unipolar mode.
With a 5V reference, the DAC8234 can be configured
to output ±10V, ±5V, 0V to 20V, or 0V to 10V. The
DAC8234 provides 14-bit monotonicity, excellent
integral nonlinearity (INL) error of ±0.5 LSB, low
glitch, and low noise over the operating temperature
range of –40°C to +105°C. This device is trimmed in
production for very low zero and gain errors. In
addition, the DAC8234 implements a
user-programmable system-level calibration function
to achieve ±0.031 LSB zero error and ±0.25 LSB gain
error.
The DAC8234 has integrated reference buffers and
output buffers. It features a standard high-speed
1.8V, 3V, or 5V serial peripheral interface (SPI) that
operates at clock rates of up to 50MHz to
communicate with a DSP or microprocessor. The four
DAC channels and the auxiliary registers are
addressed with four address bits. The device features
double-buffered interface logic for simultaneous
updates of all DACs. An asynchronous load input
(LDAC) transfers data from the input data register to
the DAC latch, and the contents of the DAC latch set
the output voltage. The asynchronous RST input sets
the output of all four DACs to 0V. The V_MON pin is an
analog monitor output that multiplexes the individual
DAC outputs or the AIN pin.
The DAC8234 is pin-compatible with the DAC8734
(16-bit) and the DAC7716 (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