DAC7634
www.ti.com
SBAS134A–JULY 2004–REVISED AUGUST 2004
Table 3. Timing Specifications (TA = –40°C to 85°C)
SYMBOL
tDS
DESCRIPTION
Data Valid to CLK Rising
Data Held Valid after CLK Rises
CLK HIGH
MIN
10
20
25
25
15
0
UNITS
ns
tDH
ns
tCH
ns
tCL
CLK LOW
ns
tCSS
tCSH
tLD1
CS LOW to CLK Rising
CLK HIGH to CS Rising
LOAD HIGH to CLK Rising
CLK Rising to LOAD LOW
LOAD LOW Time
ns
ns
10
30
30
100
150
0
ns
tLD2
ns
tLDRW
tLDDL
tLDDH
tRSSS
tRSSH
tRSTL
tRSTH
tS
ns
LDAC LOW Time
ns
LDAC HIGH Time
ns
RESETSEL Valid to RESET HIGH
RESET HIGH to RESETSEL Not Valid
RESET LOW Time
ns
100
10
10
10
ns
ns
RESET HIGH Time
ns
Settling Time
µs
Figure 65 shows a DAC7634 in a 4-mA to 20-mA
current output configuration. The output current can
be determined by Equation 3:
2.5 V * 0.5 V
ǒ
+ ƪ
125 W
0.5 V
125 W
N
Ǔ
) ǒ Ǔ
ǒ Ǔ
ƫ
I
OUT
65, 536
(3)
At full-scale, the output current is 16 mA, plus the 4
mA, for the zero current. At zero scale, the output
current is the offset current of 4 mA (0.5 V/125 Ω).
25
BB [ BURR-BROWN CORPORATION ]
