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PDF ( 数据手册 , 数据表 ) DAC8801

零件编号 DAC8801
描述 Serial Input Multiplying Digital-to-Analog Converter
制造商 Burr-Brown
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DAC8801 数据手册, 描述, 功能
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BurrĆBrown Products
from Texas Instruments
DAC8801
SLAS403A – NOVEMBER 2004 – REVISED DECEMBER 2004
14-Bit, Serial Input Multiplying Digital-to-Analog Converter
FEATURES
14-Bit Monotonic
• ±1 LSB INL
• ±0.5 LSB DNL
Low Noise: 12 nV/Hz
Low Power: IDD = 2 µA
+2.7 V to +5.5 V Analog Power Supply
2 mA Full-Scale Current ±20%
with VREF = 10 V
0.5 µs Settling Time
4-Quadrant Multiplying Reference-Input
Reference Bandwidth: 10 MHz
• ±10 V Reference Input
Reference Dynamics: -105 THD
3-Wire 50-MHz Serial Interface
Tiny 8-Lead 3 x 3 mm SON and 3 x 5 mm
MSOP Packages
Industry-Standard Pin Configuration
APPLICATIONS
Automatic Test Equipment
Instrumentation
Digitally Controlled Calibration
Industrial Control PLCs
DESCRIPTION
The DAC8801 multiplying digital-to-analog converter
is designed to operate from a single 2.7-V to 5.5-V
supply.
The applied external reference input voltage VREF
determines the full-scale output current. An internal
feedback resistor (RFB) provides temperature tracking
for the full-scale output when combined with an
external I-to-V precision amplifier.
A serial-data interface offers high-speed, three-wire
microcontroller compatible inputs using data-in (SDI),
clock (CLK), and chip select (CS).
The DAC8801 is packaged in space-saving 8-lead
SON and MSOP packages.
VDD
VREF
CS
CLK
SDI
DAC8801
D/A
Converter
14
DAC
Register
14
Shift
Register
RFB
IOUT
GND
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.
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 © 2004, Texas Instruments Incorporated







DAC8801 pdf, 数据表
DAC8801
SLAS403A – NOVEMBER 2004 – REVISED DECEMBER 2004
THEORY OF OPERATION
www.ti.com
The DAC8801 is a single channel current output, 16-bit digital-to-analog converter (DAC). The architecture,
illustrated in Figure 17, is an R-2R ladder configuration with the three MSBs segmented. Each 2R leg of the
ladder is either switched to GND or the IOUT terminal. The IOUT terminal of the DAC is held at a virtual GND
potential by the use of an external I/V converter op amp. The R-2R ladder is connected to an external reference
input VREF that determines the DAC full-scale current. The R-2R ladder presents a code independent load
impedance to the external reference of 5 kΩ± 25%. The external reference voltage can vary in a range of -10 V
to 10 V, thus providing bipolar IOUT current operation. By using an external I/V converter and the DAC8801 RFB
resistor, output voltage ranges of -VREF to VREF can be generated.
When using an external I/V converter and the DAC8801 RFB resistor, the DAC output voltage is given by
Equation 1:
VOUT + −VREF
CODE
16384
(1)
VREF
R RR
2R 2R 2R 2R 2R 2R 2R
2R
2R
2R
2R
2R RFB
IOUT
GND
Figure 17. Equivalent R-2R DAC Circuit
Each DAC code determines the 2R leg switch position to either GND or IOUT. Because the DAC output
impedance as seen looking into the IOUT terminal changes versus code, the external I/V converter noise gain will
also change. Because of this, the external I/V converter op amp must have a sufficiently low offset voltage such
that the amplifier offset is not modulated by the DAC IOUT terminal impedance change. External op amps with
large offset voltages can produce INL errors in the transfer function of the DAC8801 due to offset modulation
versus DAC code. For best linearity performance of the DAC8801, an op amp (OPA277) as shown in Figure 18
is recommended. This circuit allows VREF to swing from -10V to +10V.
VDD
U1
VDD
RFB
VREF
DAC8801
IOUT
GND
U2 15 V
_ V+
OPA277
+
V−
VO
−15 V
Figure 18. Voltage Output Configuration
8







DAC8801 equivalent, schematic
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,
copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process
in which TI products or services are used. Information published by TI regarding third-party products or services
does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.
Use of such information may require a license from a third party under the patents or other intellectual property
of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without
alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction
of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for
such altered documentation.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that
product or service voids all express and any implied warranties for the associated TI product or service and
is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.
Following are URLs where you can obtain information on other Texas Instruments products and application
solutions:
Products
Amplifiers
Data Converters
DSP
Interface
Logic
Power Mgmt
Microcontrollers
amplifier.ti.com
dataconverter.ti.com
dsp.ti.com
interface.ti.com
logic.ti.com
power.ti.com
microcontroller.ti.com
Applications
Audio
Automotive
Broadband
Digital Control
Military
Optical Networking
Security
Telephony
Video & Imaging
Wireless
www.ti.com/audio
www.ti.com/automotive
www.ti.com/broadband
www.ti.com/digitalcontrol
www.ti.com/military
www.ti.com/opticalnetwork
www.ti.com/security
www.ti.com/telephony
www.ti.com/video
www.ti.com/wireless
Mailing Address:
Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright 2005, Texas Instruments Incorporated










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