Datasheet

AD5428/AD5440/AD5447 Data Sheet
Rev. C | Page 8 of 32
04462-005
R/W
CS
1
2
3
4
5
6
7
8
9
10
20
21
22
23
24
19
18
17
16
15
14
13
12
11
I
OUT
A
R
FB
A
V
REF
A
DB9
DAC A/B
DGND
AGND
R
FB
B
V
REF
B
V
DD
NC
DB8
DB7
DB4
DB5
DB6
NC
DB0 (LSB)
DB3
DB2
DB1
I
OUT
B
AD5440
TOP VIEW
(Not to Scale)
NC = NO CONNECT
Figure 5. Pin Configuration 24-Lead TSSOP (RU-24)
Table 5. AD5440 Pin Function Descriptions
Pin No. Mnemonic Function
1
AGND
DAC Ground Pin. This pin should typically be tied to the analog ground of the system, but can be biased to
achieve single-supply operation.
2, 24 I
OUT
A, I
OUT
B DAC Current Outputs.
3, 23 R
FB
A, R
FB
B
DAC Feedback Resistor Pins. Establish voltage output for the DAC by connecting to an external amplifier
output.
4, 22 V
REF
A, V
REF
B DAC Reference Voltage Input Terminals.
5 DGND Digital Ground Pin.
6
DAC A
/B
Selects DAC A or DAC B. Low selects DAC A; high selects DAC B.
7 to16 DB9 to DB0 Parallel Data Bits 9 Through 0.
19
CS
Chip Select Input. Active low. Used in conjunction with R/W to load parallel data to the input latch or to read
data from the DAC register.
20
R/W
Read/Write. When low, used in conjunction with CS
to load parallel data. When high, used in conjunction with
CS to read back contents of the DAC register.
21 V
DD
Positive Power Supply Input. This part can be operated from a supply of 2.5 V to 5.5 V.