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PDF ( 数据手册 , 数据表 ) DAC8871

零件编号 DAC8871
描述 Serial Interface DIGITAL-TO-ANALOG CONVERTER
制造商 Burr-Brown
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DAC8871 数据手册, 描述, 功能
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BurrĆBrown Products
from Texas Instruments
DAC8871
DAC8871
SBAS396 – JUNE 2007
16-Bit, Single-Channel, ±18V Output (Unbuffered), Ultra-Low Power, Serial Interface
DIGITAL-TO-ANALOG CONVERTER
FEATURES
16-Bit Resolution
Output: ±18V for ±18V Reference Input
• ±18V Supply Operation
Very Low Power
High Accuracy INL: 1LSB
Low Noise: 10nV/Hz
Fast Settling: 1µs to 1LSB
Fast SPI™ Interface: Up To 50MHz
16-Pin TSSOP Package
Selectable Reset to Zero or Midscale
APPLICATIONS
Portable Equipment
Automatic Test Equipment
Industrial Process Control
Data Acquisition Systems
Optical Networking
DESCRIPTION
The DAC8871 is a 16-bit, single-channel, serial
input, voltage output digital-to-analog converter
(DAC). The output range is determined by the
reference voltage, VREFH and VREFL. By properly
selecting the reference, the output can be unipolar or
bipolar, and up to ±18V. These converters provide
excellent linearity (1LSB INL), low noise, and fast
settling (1µs to 1LSB of full scale output) over the
specified temperature range of –40°C to +105°C.
The output is unbuffered, which reduces the power
consumption and the error introduced by the buffer.
The device features a standard high-speed clock (up
to 50MHz), and a 3V or 5V SPI serial interface to
communicate with the DSP or microprocessors.
For optimum performance, a set of Kelvin
connections to external reference are provided. The
DAC8871 is available in a TSSOP-16 package.
VSS VCC VDD DGND VREFH-S VREFH-F VREFL-F VREFL-S
RSTSEL
RST
LDAC
Control
Logic
CS
SCLK
SDI
Serial
Interface
Input
Data
Register
DAC
VOUT
DAC
Latch
AGND
DAC8871
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.
TI DSP is a trademark of Texas Instruments.
SPI, QSPI are trademarks of Motorola, Inc.
Microwire is a trademark of National Semiconductor.
All other 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 © 2007, Texas Instruments Incorporated







DAC8871 pdf, 数据表
DAC8871
SBAS396 – JUNE 2007
www.ti.com
TYPICAL CHARACTERISTICS
At TA = +25°C, VDD = +5V, VCC = +15V, VSS = –15V, VREFH = +10V, and VREFL =–10V, unless otherwise noted.
1.00
0.75
0.50
0.25
0
-0.25
-0.50
-0.75
-1.00
0
LINEARITY ERROR
vs DIGITAL INPUT CODE
TA = +25°C
VREFH = 10V
VREFL = -5V
8192 16384 24576 32768 40960 49152 57344 65536
Digital Input Code
Figure 3.
1.00
0.75
0.50
0.25
0
-0.25
-0.50
-0.75
-1.00
0
DIFFERENTIAL LINEARITY ERROR
vs DIGITAL INPUT CODE
TA = +25°C
VREFH = 10V
VREFL = -5V
8192 16384 24576 32768 40960 49152 57344 65536
Digital Input Code
Figure 4.
1.00
0.75
0.50
0.25
0
-0.25
-0.50
-0.75
-1.00
0
LINEARITY ERROR
vs DIGITAL INPUT CODE
TA = -40°C
VREFH = 10V
VREFL = -5V
8192 16384 24576 32768 40960 49152 57344 65536
Digital Input Code
Figure 5.
1.00
0.75
0.50
0.25
0
-0.25
-0.50
-0.75
-1.00
0
DIFFERENTIAL LINEARITY ERROR
vs DIGITAL INPUT CODE
TA = -40°C
VREFH = 10V
VREFL = -5V
8192 16384 24576 32768 40960 49152 57344 65536
Digital Input Code
Figure 6.
1.00
0.75
0.50
0.25
0
-0.25
-0.50
-0.75
-1.00
0
LINEARITY ERROR
vs DIGITAL INPUT CODE
TA = +105°C
VREFH = 10V
VREFL = -5V
8192 16384 24576 32768 40960 49152 57344 65536
Digital Input Code
Figure 7.
1.00
0.75
0.50
0.25
0
-0.25
-0.50
-0.75
-1.00
0
DIFFERENTIAL LINEARY ERROR
vs DIGITAL INPUT CODE
TA = +105°C
VREFH = 10V
VREFL = -5V
8192 16384 24576 32768 40960 49152 57344 65536
Digital Input Code
Figure 8.
8 Submit Documentation Feedback







DAC8871 equivalent, schematic
DAC8871
SBAS396 – JUNE 2007
APPLICATION INFORMATION
www.ti.com
REFERENCE INPUT
The DAC full-scale output voltage is determined by the reference voltage, as shown in the Output Range
section.
Reference input VREFH can be any voltage from 0V to +18V. Reference input VREFL can be any voltage from
–18V to 0V. The current into the VREFH input and out of VREFL depends on the DAC output voltages. Refer to
Figure 27 and Figure 28 for details. The reference input appears as a varying load to the reference. If the
reference can sink or source the required current, a reference buffer is not required. The DAC8871 features a
reference drive (force) and sense connection that minimizes the internal errors caused by the changing
reference current and the circuit impedances. Figure 40 shows a typical reference configuration.
VREFH
OPA2277
DAC8871
VREFH-F
VREFL
OPA2277
VREFH-S
VREFL-F
VREFL-S
Figure 40. Buffered Reference Connection
POWER SUPPLY BYPASSING
For accurate, high-resolution performance, bypassing the supply pins with a 10µF tantalum capacitor in parallel
with a 0.1µF ceramic capacitor is recommended.
16 Submit Documentation Feedback










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