DIGITAL TIMING
Figure 3 and Table II provide detailed timing for the digital
interface of the DAC7613.
DIGITAL INPUT CODING
The DAC7613 input data is in Straight Binary format. The
output voltage is given by the following equation:
SYMBOL
t
RCS
t
RDS
t
RDH
t
DZ
t
CSD
t
WCS
t
WS
t
WH
t
DS
t
DH
t
LWD
t
RESET
DESCRIPTION
CS LOW for Read
R/W HIGH to CS LOW
R/W HIGH after CS HIGH
CS HIGH to Data Bus in
High Impedance
CS LOW to Data Bus Valid
CS LOW for Write
R/W LOW to CS LOW
R/W LOW after CS HIGH
Data Valid to CS LOW
Data Valid after CS HIGH
LOADDAC LOW
RESET LOW
MIN
200
10
0
TYP
MAX
UNITS
ns
ns
ns
100
100
50
0
5
0
5
50
50
160
ns
ns
ns
ns
ns
ns
ns
ns
ns
V
OUT
=
V
REFL
– V
REFL
)
• N
(
V
+
REFH
4096
(1)
where N is the digital input code. This equation does not
include the effects of offset (zero-scale) or gain (full-scale)
errors.
TABLE II. Timing Specifications (T
A
= –40°C to +85°C).
t
WCS
CS
t
WS
R/W
t
RCS
CS
t
RDS
R/W
t
DZ
Data Out
Data Valid
t
CSD
Data Output Timing
RESET
Digital Input Timing
Data In
t
RESET
t
RDH
LOADDAC
t
DS
t
DH
t
LWD
t
WH
FIGURE 3. Digital Input and Output Timing.
®
9
DAC7613
TI [ TEXAS INSTRUMENTS ]
