Datasheet

DAC908
4
SBAS109B
Current
Sources
LSB
Switches
Segmented
MSB
Switches
+1.24V Ref.
Latches
8-Bit Data Input
D7.......D0
DAC908
FSA
BW
+V
D
+V
A
R
SET
AGND CLK DGND
REF
IN
0.1µF
INT/EXT
I
OUT
I
OUT
BYP
PD
20pF
50Ω
50Ω
20pF
1:1
0.1µF
0.1µF
+5V
+5V
(MSB) Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
(LSB) Bit 8
NC
(1)
NC
(1)
NC
(1)
NC
(1)
NC
(1)
NC
(1)
CLK
+V
D
DGND
NC
(1)
+V
A
BYP
I
OUT
I
OUT
AGND
BW
FSA
REF
IN
INT/EXT
PD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DAC908
NOTE: (1) NC pins should be left unconnected or grounded.
PIN DESIGNATOR DESCRIPTION
1 Bit 1 Data Bit 1 (D7), MSB
2 Bit 2 Data Bit 2 (D6)
3 Bit 3 Data Bit 3 (D5)
4 Bit 4 Data Bit 4 (D4)
5 Bit 5 Data Bit 5 (D3)
6 Bit 6 Data Bit 6 (D2)
7 Bit 7 Data Bit 7 (D1)
8 Bit 8 Data Bit 8 (D0), LSB
9 NC No Connection
10 NC No Connection
11 NC No Connection
12 NC No Connection
13 NC No Connection
14 NC No Connection
15 PD Power Down, Control Input; Active
HIGH.
Contains internal pull-down circuit;
may be left unconnected if not used.
16 INT/EXT Reference Select Pin; Internal (= 0) or
External (= 1) Reference Operation.
17 REF
IN
Reference Input/Ouput. See Applications
section for further details.
18 FSA Full-Scale Output Adjust
19 BW Bandwidth/Noise Reduction Pin:
Bypass with 0.1µF to +V
A
for Optimum
Performance.
20 AGND Analog Ground
21 I
OUT
Complementary DAC Current Output
22 I
OUT
DAC Current Output
23 BYP Bypass Node: Use 0.1µF to AGND
24 +V
A
Analog Supply Voltage, 2.7V to 5.5V
25 NC No Connection
26 DGND Digital Ground
27 +V
D
Digital Supply Voltage, 2.7V to 5.5V
28 CLK Clock Input
PIN DESCRIPTIONSPIN CONFIGURATION
Top View SO, TSSOP
TYPICAL CONNECTION CIRCUIT