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DAC7731EC1K 数据手册 PDF ( 16-Bit/ Voltage Output/ Serial Input DIGITAL-TO-ANALOG CONVERTER )

零件编号 DAC7731EC1K
描述 16-Bit/ Voltage Output/ Serial Input DIGITAL-TO-ANALOG CONVERTER
制造商 Burr-Brown Corporation
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DAC7731EC1K 数据手册, 描述, 功能
DAC7731
DAC7731
SBAS249 – DECEMBER 2001
16-Bit, Voltage Output, Serial Input
DIGITAL-TO-ANALOG CONVERTER
FEATURES
q LOW POWER: 150mW MAXIMUM
q +10V INTERNAL REFERENCE
q UNIPOLAR OR BIPOLAR OPERATION
q SETTLING TIME: 5µs to ±0.003% FSR
q 16-BIT MONOTINICITY, –40°C TO +85°C
q ±10V, ±5V, OR +10V CONFIGURABLE VOLTAGE
OUTPUT
q RESET TO ZERO OR MID-SCALE
q DOUBLE-BUFFERED DATA INPUT
q DAISY-CHAIN FEATURE FOR MULTIPLE
DAC7731s ON A SINGLE BUS
q SMALL SSOP-24 PACKAGE
APPLICATIONS
q PROCESS CONTROL
q ATE PIN ELECTRONICS
q CLOSED-LOOP SERVO CONTROL
q MOTOR CONTROL
q DATA ACQUISITION SYSTEMS
DESCRIPTION
The DAC7731 is a 16-bit Digital-to-Analog Converter (DAC)
which provides 16 bits of monotonic performance over the
specified operating temperature range and offers a +10V
internal reference. Designed for automatic test equipment
and industrial process control applications, the DAC7731’s
output swing can be configured in a ±10V, ±5V, or +10V
range. The flexibility of the output configuration allows the
DAC7731 to provide both unipolar and bipolar operation by
pin strapping. The DAC7731 includes a high-speed output
amplifier with a maximum settling time of 5µs to ±0.003%
FSR for a 20V full-scale change and only consumes 100mW
(typical) of power.
The DAC7731 features a standard 3-wire, SPI-compatible
serial interface with double buffering to allow asynchronous
updates of the analog output as well as a serial data output
line for daisy-chaining multiple DAC7731’s. A user program-
mable reset control forces the DAC output to either min-scale
(0000H) or mid-scale (8000H), overriding both the input and
DAC register values. The DAC7731 is available in a
SSOP-24 package and three performance grades specified
to operate from –40°C to +85°C.
VDD VSS VCC
REFADJ REFOUT REFIN
VREF
REFEN
RSTSEL
RST
LDAC
SCLK
CS
SDO
SDI
+10V
Reference
Control
Logic
Enable
Input
Register
DAC
Register
Buffer
DAC
ROFFSET
RFB2
RFB1
SJ
VOUT
AGND DGND
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 Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 2001, Texas Instruments Incorporated




DAC7731EC1K pdf, 数据表
TYPICAL CHARACTERISTICS (Cont.)
TA = +25°C (unless otherwise noted).
POWER-SUPPY REJECTION RATIO vs FREQUENCY
(Measured at REFOUT)
10
Internal Reference Enabled
0 VSS, VCC = 15V + 1Vp-p,
10 VDD = 5V + 0.5Vp-p
20
VCC
30
40
VSS
50
VDD
60
70
80
1
10 100 1K 10K 100K 1M 10M
Frequency (Hz)
OUTPUT NOISE vs FREQUENCY
900
Unipolar Configuration, Internal Reference Enabled
800
700
600
Code FFFFH
500
400
300
200
Code 0000H
100
0
0.01K 0.1K
1K 10K 100K
Frequency (Hz)
1M
10M
OUTPUT NOISE vs FREQUENCY
800
Bipolar Configuration: ±10V, Internal Reference Enabled
700
600
500
400
Code 0000H
300
Code FFFFH
200
Code 8000H
100
0
0.01K 0.1K
1K 10K 100K
Frequency (Hz)
1M
10M
BROADBAND NOISE
Internal Reference Enabled
Filtered with 1.6Hz Low-Pass
Code FFFFH, Bipolar ±10V Configuration
10kHz Measurement BW
Time (100µs/div)
UNIPOLAR FULL-SCALE SETTLING TIME
Large-Signal Output (5V/div)
Small-Signal Error (150µV/div)
Unipolar Configuration: VOUT = 0 to +10V
Zero-Scale to +Full-Scale Change
5k, 200pF Load
Time (2µs/div)
BIPOLAR FULL-SCALE SETTLING TIME
Large-Signal Output (5V/div)
Small-Signal Error (300µV/div)
Bipolar Configuration: VOUT = 10 to +10V
Full-Scale to +Full-Scale
5k, 200pF Load
Time (2µs/div)
8 DAC7731
www.ti.com
SBAS249


DAC7731EC1K equivalent, schematic
LAYOUT
A precision analog component requires careful layout, adequate
bypassing, and clean, well-regulated power supplies. The
DAC7731 offers separate digital and analog supplies, as it will
often be used in close proximity with digital logic, microcontrollers,
microprocessors, and digital signal processors. The more digital
logic present in the design and the higher the switching speed,
the more important it will become to separate the analog and
digital ground and supply planes at the device.
Since the DAC7731 has both analog and digital ground pins,
return currents can be better controlled and have less effect
on the DAC output error. Ideally, AGND would be connected
directly to an analog ground plane and DGND to the digital
ground plane. The analog ground plane would be separate
from the ground connection for the digital components until
they were connected at the power-entry point of the system.
The voltages applied to VCC and VSS should be well regulated
and low noise. Switching power supplies and DC/DC convert-
ers will often have high-frequency glitches or spikes riding on
the output voltage. In addition, digital components can create
similar high-frequency spikes as their internal logic switches
states. This noise can easily couple into the DAC output
voltage through various paths between the power connec-
tions and analog output.
In addition, a 1µF to 10µF bypass capacitor in parallel with a
0.1µF bypass capacitor is strongly recommended for each
supply input. In some situations, additional bypassing may be
required, such as a 100µF electrolytic capacitor or even a "Pi"
filter made up of inductors and capacitorsall designed to
essentially low-pass filter the analog supplies, removing any
high frequency noise components.
16 DAC7731
www.ti.com
SBAS249



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零件编号描述制造商
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Burr-Brown Corporation

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