DAC7631EB1K BURR-BROWN [Burr-Brown Corporation], DAC7631EB1K Datasheet - Page 13

• Manufacturer Part Number: DAC7631EB1K
• Description: Serial Input, 16-Bit, Voltage Output DIGITAL-TO-ANALOG CONVERTER
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

The current into the V
on the DAC output voltage, and can vary from a few
microamps to approximately 0.3mA in dual supply or 0.15mA
in single-supply operation. The reference input appears as a
varying load to the reference. If the reference can sink or
source the required current, a reference buffer is not re-
quired. The DAC7631 features a reference drive and sense
connection such that the internal errors caused by the chang-
ing reference current and the circuit impedances can be
minimized. Figures 5 through 13 show different reference
configurations, and the effect on the linearity and differen-
tial linearity.
SERIAL DATA INPUT
TABLE I. DAC7631 Logic Truth Table.
FIGURE 4. Analog Output Closed-loop Configuration. R
FIGURE 5. Dual-supply Buffered References.
B15
D15
CS
H
H
X
X
L
B14
D14
–2.5V
+2.5V
RST
B13
D13
H
H
H
–V
+V
REF
H input and out of V
B12
D12
Serial Data Out
Serial Data In
RSTSEL
Chip Select
X
X
X
H
L
Clock
+2.5V
B11
D11
+V
B10
D10
LDAC
OPA2234
X
H
X
X
+V
–V
REF
10
1
2
3
4
5
6
7
8
9
L depends
V
V
V
V
DGND
V
SDO
SDI
CLK
CS
B9
D9
REF
REF
REF
REF
DD
H
H Sense
L
L Sense
LOAD
H
H
L
X
X
B8
D8
DAC7631
W1
2200pF
2200pF
13
and R
V
OUT
DIGITAL INTERFACE
Table I shows the basic control logic for the DAC7631. The
interface consists of a serial clock input (CLK), serial data
input (SDI), DAC input register load control signal (LOAD),
and DAC load control signal (LDAC). In addition, a chip
select input (CS) is provided to simplify device selection in
systems with multiple devices. An asynchronous reset input
(RST), triggered by a rising edge, is provided to force start-
up conditions, periodic resets, or emergency resets to a
known state. The action of RST can be selected using the
reset select (RSTSEL) pin.
B7
D7
Reset to Midscale
RSTSEL
Reset to Zero
W2
AGND
Sense
LOAD
LDAC
REGISTER
100
V
100
RST
V
V
NC
OUT
INPUT
CC
SS
represent wiring resistance.
Write
Hold
Hold
B6
D6
20
19
18
17
16
15
14
13
12
11
B5
D5
1000pF
1000pF
R
R
0.1 F
Reset DAC Registers
Load
Load DAC Registers
W1
W2
Reset to Midscale
Reset to Zero
B4
D4
REGISTER
+
1 F
Write
DAC
Hold
Hold
+5V
V
1
2
4
3
OUT
DAC7631
B3
D3
V
V
V
V
REF
REF
REF
REF
H
H Sense
L
L Sense
DAC7631
B2
D2
Reset to Midscale
Reset to Zero
Write Input
Update
B1
D1
MODE
Hold
B0
D0
®