Datasheet

9
LTC1666/LTC1667/LTC1668
BLOCK DIAGRA
W
–
+
I
FS
/8
I
REFIN
I
INT
R
SET
2k
0.1µF
0.1µF
0.1µF
–5V
0.1µF
REFOUT
V
DD
V
REF
15
16
COMP121
COMP2
V
SS
22
23
2.5V
REFERENCE
ATTENUATOR
LADDER
LSB SWITCHES
INPUT LATCHES
CLOCK
INPUT
12-BIT
DATA INPUT
SEGMENTED SWITCHES
FOR DB15–DB12
CURRENT SOURCE ARRAY
AGND
17
DGND
24
CLK DB0DB11 • • •
• • •
• • • • • •
26 27 10
1666 BD
18
LADCOM
20
I
OUT A
19
I
OUT B
52.3Ω 52.3Ω
V
OUT
1V
P-P
DIFFERENTIAL
+
–
0.1µF
25
5V
–
+
I
FS
/8
I
REFIN
I
INT
R
SET
2k
0.1µF
0.1µF
0.1µF
–5V
0.1µF
REFOUT
V
REF
15
16
COMP121
COMP2
V
SS
22
23
2.5V
REFERENCE
ATTENUATOR
LADDER
LSB SWITCHES
INPUT LATCHES
CLOCK
INPUT
14-BIT
DATA INPUT
SEGMENTED SWITCHES
FOR DB15–DB12
CURRENT SOURCE ARRAY
AGND
17
DGND
24
CLK DB0DB13 • • •
• • •
• • • • • •
26 27 12
1667 BD
18
LADCOM
20
I
OUT A
19
I
OUT B
52.3Ω 52.3Ω
V
OUT
1V
P-P
DIFFERENTIAL
+
–
0.1µF
25
5V
V
DD
LTC1666
LTC1667