Datasheet

Data Sheet AD5428/AD5440/AD5447
Rev. C | Page 7 of 32
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
04462-004
R/W
CS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
I
OUT
A
R
FB
A
V
REF
A
DB7
DAC A/
B
DGND
AGND
R
FB
B
V
REF
B
V
DD
DB0 (LSB)
DB4
DB5
DB6
DB3
DB2
DB1
I
OUT
B
AD5428
TOP VIEW
(Not to Scale)
Figure 4. Pin Configuration 20-Lead TSSOP (RU-20)
Table 4. AD5428 Pin Function Descriptions
Pin No. Mnemonic Description
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, 20 I
OUT
A, I
OUT
B DAC Current Outputs.
3, 19 R
FB
A, R
FB
B
DAC Feedback Resistor Pins. These pins establish voltage output for the DAC by connecting to an external
amplifier output.
4, 18 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 to14 DB7 to DB0 Parallel Data Bits 7 Through 0.
15
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.
16
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.
17 V
DD
Positive Power Supply Input. This part can be operated from a supply of 2.5 V to 5.5 V.