Datasheet
REV. 0
AD5332/AD5333/AD5342/AD5343
–7–
AD5342 FUNCTIONAL BLOCK DIAGRAM
V
OUT
A
BUFFER
AD5342
V
OUT
B
BUFFER
POWER-ON
RESET
DAC
REGISTER
DAC
REGISTER
INPUT
REGISTER
INPUT
REGISTER
INTER-
FACE
LOGIC
V
DD
DB
11
DB
0
CS
WR
A0
CLR
LDAC
.
.
.
V
REF
A
POWER-DOWN
LOGIC
RESET
PD
GND
V
REF
B
12-BIT
DAC
12-BIT
DAC
AD5342 PIN FUNCTION DESCRIPTIONS
Pin
No. Mnemonic Function
1 GAIN Gain Control Pin. This controls whether the output range from the DAC is 0-V
REF
or 0-2 V
REF
.
2 BUF Buffer Control Pin. This pin controls whether the reference input to the DAC is buffered or unbuffered.
3V
REF
B Reference Input for DAC B.
4V
REF
A Reference Input for DAC A.
5V
OUT
A Output of DAC A. Buffered output with rail-to-rail operation.
6V
OUT
B Output of DAC B. Buffered output with rail-to-rail operation.
7, 8 NC No Connect.
9 GND Ground reference point for all circuitry on the part.
10 CS Active Low Chip Select Input. This is used in conjunction with WR to write data to the parallel interface.
11 WR Active low Write Input. This is used in conjunction with CS to write data to the parallel interface.
12 A0 Address pin for selecting between DAC A and DAC B.
13 CLR Asynchronous active low control input that clears all input registers and DAC registers to zeros.
14 LDAC Active low control input that updates the DAC registers with the contents of the input registers. This
allows all DAC outputs to be simultaneously updated.
15 PD Power-Down Pin. This active low control pin puts all DACs into power-down mode.
16 V
DD
Power Supply Pin. These parts can operate from 2.5 V to 5.5 V and the supply should be decoupled with a
10 F capacitor in parallel with a 0.1 F capacitor to GND.
17–28 DB
0
–DB
11
12 Parallel Data Inputs. DB
11
is the MSB of these 12 bits.
AD5342 PIN CONFIGURATION
TOP VIEW
(Not to Scale)
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
AD5342
LDAC
A0
WR
CS
GND
BUF
V
REF
B
V
REF
A
V
OUT
B
V
OUT
A
GAIN
PD
V
DD
DB
0
DB
1
DB
2
DB
3
DB
4
DB
9
DB
8
DB
5
DB
6
DB
7
12-BIT
NC
NC
CLR
DB
10
DB
11
NC = NO CONNECT