Datasheet

17
LTC1666/LTC1667/LTC1668
APPLICATIO S I FOR ATIO
WUUU
Figure 10. Suggested Evaluation Circuit
J4 V
OUT
J5 I
OUT B
J6 EXTCLK
JP9
123
1516
R3
1.91k
0.1%
R2
200Ω
JP1
C17
0.1µF
LTC1668
20 19
21 22
23
18
C7 0.1µF
5V
–5V
TP5
TESTPOINT WHT
C3
0.1µF
C18
0.1µF
25 17
24
C10 0.1µF
C11 0.1µF
R9 50Ω 0.1%
R12
49.9Ω
1%
JP6
R10 50Ω 0.1%
C12 22pF
C12 22pF
C9
0.1µF
C8 0.1µF
C8 0.1µF
JP5
TP3
TESTPOINT
WHT
JP7
JP3
R5 R6
R7 110Ω
JP4 JP2
5V
REFOUTREFIN
27 28
1 2 3 4 5 6 7 8 9
10 11 12 13 14 26
DB15 (MSB) DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 (LSB) CLK
16 15 14 13 12 11 10 9
1 2 3 4 5 6 7 8
I
OUT A
I
OUT B
COMP1 COMP2
V
SS
LADCOM
V
DD
AGND
DGND
R4
J2 I
OUT A
C4
R8
3 2 1
4
T1
MINI-
CIRCUITS
T1–1T
6
C5
JP8
TP4
TESTPOINT
WHT
2 4 6
1 3 5
RN5
+5VD
22Ω
+5VD
J7
J10
TP6
TESTPOINT RED
4
2
5V
6
LT1460DCS8-2.5
AMP
102159-9
16 15 14 13 12 11 10 9
1 2 3 4 5 6 7 8
RN6
22Ω
1 3 5 7 9
11 13 15 17 19 21 23 25 27 29 31 33 35 37 39
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
TP2
TESTPOINT WHT
2.5V
REF
TP10
TESTPOINT BLK
TP1
V
IN
V
OUT
GND
C2
0.1µF
C1 0.1µF
J1
EXTREF
R1
10Ω
+
C19 0.1µF
C14 10µF
25V
–5V
AGND DGND
J9
TP8
TESTPOINT RED
GROUND PLANE
TIE POINT
+
C20 0.1µF
C16 10µF
25V
1666/7/8 F11
C22 0.1µF
+5VA
J8
J11
TP7
TESTPOINT RED
TP9
TESTPOINT BLK
+
C23 0.1µF
C15 10µF
25V
C21 0.1µF
OPTIONAL
SIP
PULL-UP/
PULL-DOWN
RESISTORS
(NOT
INSTALLED)
OPTIONAL
SIP
PULL-UP/
PULL-DOWN
RESISTORS
(NOT
INSTALLED)
+5VD
R16
0Ω
R15
0Ω
R14
0Ω
R13
0Ω