Datasheet

5
®
DAC7644
PIN DESCRIPTIONS
PIN NAME DESCRIPTION
1 DB15 Data Bit 15, MSB
2 DB14 Data Bit 14
3 DB13 Data Bit 13
4 DB12 Data Bit 12
5 DB11 Data Bit 11
6 DB10 Data Bit 10
7 DB9 Data Bit 9
8 DB8 Data Bit 8
9 DB7 Data Bit 7
10 DB6 Data Bit 6
11 DB5 Data Bit 5
12 DB4 Data Bit 4
13 DB3 Data Bit 3
14 DB2 Data Bit 2
15 DB1 Data Bit 1
16 DB0 Data Bit 0, LSB
17 RSTSEL Reset Select. Determines the action of RST. If
HIGH, a RST command will set the DAC registers to
mid-scale. If LOW, a RST command will set the DAC
registers to zero.
18 RST Reset, Rising Edge Triggered. Depending on the
state of RSTSEL, the DAC registers are set to either
mid-scale or zero.
19 LOADDACS DAC Output Registers Load Control. Rising edge
triggered.
20 R/W Enabled by the CS, Controls Data Read and Write
from the Input Registers.
21 A1 Enabled by the CS, in Combination With A0 Selects
the Individual DAC Input Registers.
22 A0 Enabled by the CS, in Combination With A1 Selects
the Individual DAC Input Registers.
Top View SSOP
PIN CONFIGURATION
PIN NAME DESCRIPTION
23 CS Chip Select. Active LOW.
24 DGND Digital Ground
25 V
DD
Positive Power Supply (digital)
26 V
CC
Positive Power Supply (analog)
27 AGND Analog Ground
28 V
SS
Negative Power Supply
29 V
OUT
D DAC D Voltage Output
30 V
OUT
D Sense DAC D’s Output Amplifier Inverting Input. Used to
close the feedback loop at the load.
31 V
REF
L CD Sense DAC C and D Reference Low Sense Input
32 V
REF
L CD DAC C and D Reference Low Input
33 V
REF
H CD DAC C and D Reference High Input
34 V
REF
H CD Sense DAC C and D Reference High Sense Input
35 V
OUT
C DAC C Voltage Output
36 V
OUT
C Sense DAC C’s Output Amplifier Inverting Input. Used to
close the feedback loop at the load.
37 V
OUT
B DAC B Voltage Output
38 V
OUT
B Sense DAC B’s Output Amplifier Inverting Input. Used to
close the feedback loop at the load.
39 V
REF
H AB Sense DAC A and B Reference High Sense Input
40 V
REF
H AB DAC A and B Reference High Input
41 V
REF
L AB DAC A and B Reference Low Input
42 V
REF
L AB Sense DAC A and B Reference Low Sense Input
43 V
OUT
A DAC A Voltage Input
44 V
OUT
A Sense DAC A’s Output Amplifier Inverting Input. Used to
close the feedback loop at the load.
45 NC No Connection
46 NC No Connection
47 NC No Connection
48 NC No Connection
DB15
DB14
DB13
DB12
DB11
DB10
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
RSTSEL
RST
LOADDACS
R/W
A1
A0
CS
DGND
NC
NC
NC
NC
V
OUT
A Sense
V
OUT
A
V
REF
L AB Sense
V
REF
L AB
V
REF
H AB
V
REF
H AB Sense
V
OUT
B Sense
V
OUT
B
V
OUT
C Sense
V
OUT
C
V
REF
H CD Sense
V
REF
H CD
V
REF
L CD
V
REF
L CD Sense
V
OUT
D Sense
V
OUT
D
V
SS
AGND
V
CC
V
DD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
DAC7644