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DAC7741 Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer DAC7741
Beschreibung 16-Bit/ Single Channel DIGITAL-TO-ANALOG CONVERTER With Internal Reference and Parallel Interface
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 20 Seiten
DAC7741 Datasheet, Funktion
DAC7741
DAC7741
SBAS248A – DECEMBER 2001 – REVISED JULY 2003
16-Bit, Single Channel
DIGITAL-TO-ANALOG CONVERTER
With Internal Reference and Parallel Interface
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 MONOTONICITY, –40°C TO +85°C
q ±10V, ±5V OR +10V CONFIGURABLE VOLTAGE
OUTPUT
q RESET TO MIN-SCALE OR MID-SCALE
q DOUBLE-BUFFERED DATA INPUT
q INPUT REGISTER DATA READBACK
q SMALL LQFP-48 PACKAGE
APPLICATIONS
q PROCESS CONTROL
q ATE PIN ELECTRONICS
q CLOSED-LOOP SERVO CONTROL
q MOTOR CONTROL
q DATA ACQUISITION SYSTEMS
DESCRIPTION
The DAC7741 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,
low-drift internal reference. Designed for automatic test equip-
ment and industrial process control applications, the DAC7741
output swing can be configured in a ±10V, ±5V, or +10V
range. The flexibility of the output configuration allows the
DAC7741 to provide both unipolar and bipolar operation by
pin strapping. The DAC7741 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 DAC7741 features a standard 16-bit parallel interface with
double buffering to allow asynchronous updates of the analog
output and data read-back to support data integrity verification
prior to an update. A user-programmable reset control allows
the DAC output to reset to min-scale (0000H) or mid-scale
(8000H) overriding the DAC register values. The DAC7741 is
available in a LQFP-48 package and four performance grades
specified to operate from 0°C to +70°C and 40°C to +85°C.
VDD VSS VCC
REFADJ REFOUT REFIN
VREF
REFEN
CS
R/W
RST
RSTSEL
+10V
Reference
Control
Logic
Buffer
ROFFSET
RFB2
RFB1
Data I/O
16
I/O
Buffer
Input
Register
DAC
Register
DAC
SJ
VOUT
AGND DGND
LDAC
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.
All 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 Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 2001-2003, Texas Instruments Incorporated






DAC7741 Datasheet, Funktion
TIMING CHARACTERISTICS
PARAMETER
tRCS
tRDS
tRDH
tDZ
tCSD
tWCS
tWS
tWH
tLS
tLH
tLX
tDS
tDH
tLWD
tSS
tSH
tRSS
tS
DESCRIPTION
CS LOW for Read
R/W HIGH to CS LOW
R/W HIGH after CS HIGH
CS HIGH to Data Bus High Impedance
CS LOW to Data Bus Valid
CS LOW for Write
R/W LOW to CS LOW
R/W LOW after CS HIGH
CS LOW to LDAC HIGH
CS LOW after LDAC HIGH
LDAC HIGH
Data Valid to CS LOW
Data Valid after CS HIGH
LDAC LOW
RSTSEL Valid Before RST LOW
RSTSEL Valid After RST HIGH
RST LOW
Voltage Output Settling Time
TIMING DIAGRAMS
DAC7741Y
MIN
TYP
MAX
UNITS
100 ns
10 ns
10 ns
10 70 ns
85 100 ns
30 ns
10 ns
10 ns
40 ns
0 ns
30 ns
0 ns
20 ns
40 ns
0 ns
10 ns
30 ns
5 µs
CS
tWS
R/W
Data In
DB15-DB0
LDAC
VOUT
RESET TIMING
tWCS
tWH
tDH
Data Valid
tDS
tLS
tLWD
tLH
tLX
tS
WRITE CYCLE
CS
tRDS
R/W
Data Out
DB15-DB0
tRCS
tRDH
Data Valid
tCSD
tDZ
±0.003% of FSR
Error Bands
READ CYCLE
tSS
RSTSEL
RST
tSH
tRSS
+FS
(RSTSEL = LOW)
VOUT
FS
+FS
VOUT (RSTSEL = HIGH)
FS
tS
Min-Scale
Mid-Scale
6 DAC7741
www.ti.com
SBAS248A

6 Page









DAC7741 pdf, datenblatt
THEORY OF OPERATION
The DAC7741 is a voltage output, 16-bit DAC with a +10V
built-in internal reference. The architecture is an R-2R ladder
configuration with the three MSBs segmented, followed by
an operational amplifier that serves as a buffer. The output
buffer is designed to allow user-configurable output adjust-
ments, giving the DAC7741 output voltage ranges of 0V to
+10V, 5V to +5V, or 10V to +10V. Please refer to
Figures 2, 3, and 4 for pin configuration information.
The digital input is a parallel word made up of the 16-bit DAC
code, which is then loaded into the DAC register using the
LDAC input pin. The converter can be powered from ±12V
to ±15V dual analog supplies and a +5V logic supply. The
device offers a reset function, which immediately sets the
DAC output voltage and DAC register to min-scale (code
0000H) or mid-scale (code 8000H). The data I/O and reset
functions are discussed in more detail in the following sec-
tions.
REFADJ REFOUT REFIN
VREF
Buffer
R/4
+10V Internal
Reference
R
R/2 R/2 R/4
2R 2R 2R 2R 2R 2R 2R 2R 2R
R/4
FIGURE 1. DAC7741 Architecture.
VREF
AGND
ROFFSET
RFB2
RFB1
SJ
VOUT
VDD
0.1µF
1µF
Control Bus
DGND
VDD
RST
LDAC
CS
R/W
RSTSEL
REFEN
REFOUT
REFADJ
REFIN
NC
VSS
0.1µF
VCC
1µF
0.1µF
1µF
Data Bus
DAC7741
NC
NC
DB6
DB5
DB4
DB3 Data Bus
DB2
DB1
DB0
NC
NC
NC
(0V to +10V)
FIGURE 2. Basic Operation: VOUT = 0 to +10V.
12
www.ti.com
DAC7741
SBAS248A

12 Page





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