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DAC7715U Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer DAC7715U
Beschreibung Quad/ Serial Input/ 12-Bit/ Voltage Output DIGITAL-TO-ANALOG CONVERTER
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 17 Seiten
DAC7715U Datasheet, Funktion
DAC7715
DAC7715
SBAS140
Quad, Serial Input, 12-Bit, Voltage Output
DIGITAL-TO-ANALOG CONVERTER
FEATURES
q LOW POWER: 250mW (max)
q UNIPOLAR OR BIPOLAR OPERATION
q SETTLING TIME: 10µs to 0.012%
q 12-BIT LINEARITY AND MONOTONICITY:
–40°C to +85°C
q DOUBLE-BUFFERED DATA INPUTS
q SMALL SO-16 PACKAGE
APPLICATIONS
q PROCESS CONTROL
q ATE PIN ELECTRONICS
q CLOSED-LOOP SERVO-CONTROL
q MOTOR CONTROL
q DATA ACQUISITION SYSTEMS
q DAC-PER-PIN PROGRAMMERS
GND
Input
Register A
SDI
Serial-to-
Parallel
Shift
Register
12
Input
Register B
Input
Register C
CLK
CS
DAC
Select
Input
Register D
DESCRIPTION
The DAC7715 is a quad, serial input, 12-bit, voltage
output Digital-to-Analog Converter (DAC) with
guaranteed 12-bit monotonic performance over the
–40°C to +85°C temperature range. An asynchronous
reset clears all registers to either mid-scale (800H) or
zero-scale (000H), selectable via the RESETSEL pin.
The individual DAC inputs are double buffered to
allow for simultaneous update of all DAC outputs.
The device can be powered from a single +15V supply
or from dual +15V and –15V supplies.
Low power and small size makes the DAC7715 ideal
for automatic test equipment, DAC-per-pin program-
mers, data acquisition systems, and closed-loop servo-
control. The device is available in a SO-16 package
and is guaranteed over the –40°C to +85°C tempera-
ture range.
VCC VREFH
DAC
Register A
DAC A
DAC
Register B
DAC B
DAC
Register C
DAC C
DAC
Register D
DAC D
VOUTA
VOUTB
VOUTC
VOUTD
LOADREG
RESETSEL RESET LOADDACS VREFL VSS
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
http://www.burr-brown.com/
http://www.ti.com/
Copyright © 2000 Texas Instruments Incorporated
PDS-11572A
DAC7715Printed in U.S.A. September, 2000
®






DAC7715U Datasheet, Funktion
TYPICAL PERFORMANCE CURVES: VSS = 0V
At TA = +25°C, VCC = +15V, VSS = 0V, VREFH = +10V, VREFL = 0V, representative unit, unless otherwise specified.
LINEARITY ERROR AND
DIFFERENTIAL LINEARITY ERROR vs CODE
Single Channel 25°C
(Typical of Each Output Channel)
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
LINEARITY ERROR AND
DIFFERENTIAL LINEARITY ERROR vs CODE
Single Channel 85°C
(Typical of Each Output Channel)
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
000H
200H
400H 600H 800H A00H C00H
Digital Input Code
E00H FFFH
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
000H
200H
400H
600H 800H A00H C00H
Digital Input Code
E00H FFFH
LINEARITY ERROR AND
DIFFERENTIAL LINEARITY ERROR vs CODE
Single Channel –40°C
(Typical of Each Output Channel)
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
000H
200H
400H 600H 800H A00H C00H
Digital Input Code
E00H FFFH
ZERO-SCALE ERROR vs TEMPERATURE
(Code 004H)
2.0
1.5
1.0
DAC A
0.5
DAC D
0
–0.5
–1.0
DAC B
DAC C
–1.5
–2.0
–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
Temperature (°C)
FULL-SCALE ERROR vs TEMPERATURE
(Code FFFH)
2.0
1.5
1.0
DAC D
DAC B
0.5
0
–0.5
DAC C
–1.0
DAC A
–1.5
–2.0
–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
Temperature (°C)
1.2
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
0
–0.2
–0.4
–0.6
–0.8
–1.0
–1.2
–1.4
–1.6
000H
200H
CURRENT vs CODE
All DACs Set to Indicated Code
VREFH
VREFL
400H 600H 800H A00H C00H
Digital Input Code
E00H FFFH
®
DAC7715
6

6 Page









DAC7715U pdf, datenblatt
THEORY OF OPERATION
The DAC7715 is a quad, serial input, 12-bit, voltage output
DAC. The architecture is a classic R-2R ladder configuration
followed by an operational amplifier that serves as a buffer,
as shown in Figure 1. Each DAC has its own R-2R ladder
network and output op amp, but all share the reference
voltage inputs. The minimum voltage output (“zero-scale”)
and maximum voltage output (“full-scale”) are set by external
voltage references (VREFL and VREFH, respectively). The
digital input is a 16-bit serial word that contains the 12-bit
DAC code and a 2-bit address code that selects one of the four
DACs (the two remaining bits are unused). The converter can
be powered from a single +15V supply or a dual ±15V
supply. Each device offers a reset function which immedi-
ately sets all DAC output voltages and internal registers to
either zero-scale (code 000H) or mid-scale (code 800H). The
reset code is selected by the state of the RESETSEL pin
(LOW = 000H, HIGH = 800H). See Figures 2 and 3 for the
basic operation of the DAC7715.
RF
R RR RRRR
2R 2R
2R 2R 2R 2R 2R 2R 2R
VOUT
VREFH
FIGURE 1. DAC7715 Architecture.
VREFL
+15V
+
1µF to 10µF
0.1µF
0V to +10V
0V to +10V
+10.00V
0V to +10V
0V to +10V
0.1µF
DAC7715
1 VCC
2 VOUTD
3 VOUTC
4 VREFL
5 VREFH
6 VOUTB
7 VOUTA
8 VSS
RESETSEL 16
RESET 15
LOADREG 14
LOADDACS 13
CS 12
CLK 11
SDI 10
GND 9
Reset DACs(1)
Update Selected Register
Update All DAC Registers
Chip Select
Clock
Serial Data In
NOTE: (1) As configured, RESET LOW sets all internal registers to code 000H (0V).
If RESETSEL is HIGH, RESET LOW sets all internal registers to code 800H (5.00V).
FIGURE 2. Basic Single-Supply Operation of the DAC7715.
+15V +
1µF to 10µF
–10V to +10V
–10V to +10V
–10.00V
+10.00V
–10V to +10V
–10V to +10V
–15V
+ 1µF to 10µF
0.1µF
0.1µF
0.1µF
DAC7715
1 VCC
2 VOUTD
3 VOUTC
4 VREFL
5 VREFH
6 VOUTB
7 VOUTA
8 VSS
RESETSEL 16
RESET 15
LOADREG 14
LOADDACS 13
CS 12
CLK 11
SDI 10
GND 9
+5V
Reset DACs(1)
Update Selected Register
Update All DAC Registers
Chip Select
Clock
Serial Data In
0.1µF
NOTE: (1) As configured, RESET LOW sets all internal registers to code 800H (0V).
If RESETSEL is LOW, RESET LOW sets all internal registers to code 000H (–10 V).
FIGURE 3. Basic Dual-Supply Operation of the DAC7715.
®
DAC7715
12

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