Datasheet
DAC7731
2
SBAS249B
www.ti.com
ABSOLUTE MAXIMUM RATINGS
(1)
V
CC
to V
SS
........................................................................... –0.3V to +32V
V
CC
to AGND ...................................................................... –0.3V to +16V
V
SS
to AGND ...................................................................... –16V to +0.3V
AGND
to DGND ................................................................... –0.3V to 0.3V
REF
IN
to AGND ..............................................................0V to V
CC
– 1.4V
V
DD
to DGND ........................................................................ –0.3V to +6V
Digital Input Voltage to DGND ................................. –0.3V to V
DD
+ 0.3V
Digital Output Voltage to DGND .............................. –0.3V to V
DD
+ 0.3V
Operating Temperature Range ........................................–40°C to +85°C
Storage Temperature Range ......................................... –65°C to +150°C
Junction Temperature (TJ Max) .................................................... +150°C
NOTE: (1) Stresses above those listed under Absolute Maximum Ratings may
cause permanent damage to the device. Exposure to absolute maximum
conditions for extended periods may affect device reliability.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may be
more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
PACKAGE/ORDERING INFORMATION
(1)
SPECIFIED
PACKAGE TEMPERATURE PACKAGE ORDERING TRANSPORT
PRODUCT PACKAGE-LEAD DESIGNATOR RANGE MARKING NUMBER
(2)
MEDIA, QUANTITY
DAC7731E SSOP-24 DB –40°C to +85°C DAC7731E DAC7731E Rails, 60
"" " " "DAC7731E/1K Tape and Reel,1000
DAC7731EB SSOP-24 DB –40°C to +85°C DAC7731EB DAC7731EB Rails, 60
"" " " "DAC7731EB/1K Tape and Reel, 1000
DAC7731EC SSOP-24 DB –40°C to +85°C DAC7731EC DAC7731EC Rails, 60
"" " " "DAC7731EC/1K Tape and Reel, 1000
NOTE: (1) For the most current package ordering information, see the Package Option Addendum at the end of this data sheet, or see the TI web site at www.ti.com.
Top View SSOP
PIN CONFIGURATION
PIN NAME DESCRIPTION
1V
CC
Positive Analog Power Supply
2 REF
OUT
Internal Reference Output
3REF
IN
Reference Input
4 REFADJ Internal Reference Trim. (Acts as a gain adjustment
input when the internal reference is used.)
5V
REF
Buffered Output from REF
IN
, can be used to drive
external devices. Internally, this pin directly drives the
DAC's circuitry.
6R
OFFSET
Offsetting Resistor
7 AGND Analog ground
8 RFB2 Feedback Resistor 2, used to configure DAC output
range.
9 RFB1 Feedback Resistor 1, used to configure DAC output
range.
10 SJ Summing Junction of the Output Amplifier
11 V
OUT
DAC Voltage Output
12 V
DD
Digital Power Supply
13 DGND Digital Ground
14 TEST Reserved, Connect to DGND
15 NC No Connection
16 RST V
OUT
reset; active LOW, depending on the state of
RSTSEL, the DAC register is either reset to mid-
scale or min-scale.
17 LDAC DAC register load control, rising dege triggered. Data
is loaded from the input register to the DAC register.
18 SDI Serial Data Input. Data is latched into the input
register on the rising edge of SCLK.
19 SDO Serial Data Output, delayed 16 SCLK clock cycles.
20 CS Chip Select, Active LOW
21 SCLK Serial Clock Input
22 RSTSEL Reset Select; determines the action of RST. If HIGH,
RST will reset the DAC register to mid-scale. If LOW,
RST will reset the DAC register to min-scale.
23 REFEN Enables internal +10V reference (REF
OUT
), active
LOW.
24 V
SS
Negative Analog Power Supply
PIN DESCRIPTIONS
V
CC
REF
OUT
REF
IN
REFADJ
V
REF
R
OFFSET
AGND
RFB2
RFB1
SJ
V
OUT
V
DD
V
SS
REFEN
RSTSEL
SCLK
CS
SDO
SDI
LDAC
RST
NC
TEST
DGND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
DAC7731
NOTE: RST, LDAC, SDI, CS and SCK are Schmitt-triggered inputs.