DAC7715UB1K BURR-BROWN [Burr-Brown Corporation], DAC7715UB1K Datasheet - Page 12

• Manufacturer Part Number: DAC7715UB1K
• Description: Quad, Serial Input, 12-Bit, Voltage Output DIGITAL-TO-ANALOG CONVERTER
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

FIGURE 2. Basic Single-Supply Operation of the DAC7715.
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 (V
FIGURE 1. DAC7715 Architecture.
FIGURE 3. Basic Dual-Supply Operation of the DAC7715.
®
DAC7715
2R
REFL
+15V
–15V
–10V to +10V
–10V to +10V
–10V to +10V
–10V to +10V
0V to +10V
0V to +10V
0V to +10V
0V to +10V
2R
and V
+15V
+
+
+
NOTE: (1) As configured, RESET LOW sets all internal registers to code 000
If RESETSEL is HIGH, RESET LOW sets all internal registers to code 800
–10.00V
+10.00V
+10.00V
1 F to 10 F
1 F to 10 F
1 F to 10 F
R
REFH
2R
, respectively). The
R
0.1 F
0.1 F
0.1 F
0.1 F
0.1 F
0.1 F
2R
NOTE: (1) As configured, RESET LOW sets all internal registers to code 800
If RESETSEL is LOW, RESET LOW sets all internal registers to code 000
R
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
2R
V
V
V
V
V
V
V
V
CC
OUTD
OUTC
REFL
REFH
OUTB
OUTA
R
V
V
V
V
V
V
V
SS
V
CC
OUTD
OUTC
REFL
REFH
OUTB
OUTA
SS
DAC7715
12
DAC7715
2R
LOADDACS
RESETSEL
LOADREG
R
LOADDACS
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 000
reset code is selected by the state of the RESETSEL pin
(LOW = 000
basic operation of the DAC7715.
RESETSEL
LOADREG
RESET
RESET
GND
CLK
SDI
CS
GND
CLK
SDI
2R
CS
R
16
15
14
13
12
11
10
9
16
15
14
13
12
11
10
9
H
H
2R
(5.00V).
H
, HIGH = 800
(0V).
R
+5V
Reset DACs
Update Selected Register
Update All DAC Registers
Chip Select
Clock
Serial Data In
Reset DACs
Update Selected Register
Update All DAC Registers
Chip Select
Clock
Serial Data In
2R
H
V
V
(1)
REF
REF
) or mid-scale (code 800
(1)
H
R
H
). See Figures 2 and 3 for the
F
H
L
(–10 V).
H
(0V).
V
OUT
H
). The