Datasheet

20
LTC1744
1744f
DC345B Evaluation Circuit Schematic of the LTC1744
APPLICATIO S I FOR ATIO
WUU
U
R
N1A
33Ω
R6
33.2Ω
C4 4.7µF
C3
10µF
R5
1Ω
3 4
1 2
5V
U3
LT1521-3
R
N5A
33Ω
R
N5B
33Ω
R
N5C
33Ω
R
N5D
33Ω
R
N6A
33Ω
R
N6B
33Ω
R
N6C
33Ω
R
N6D
33Ω
R
N7A
33Ω
R
N7B
33Ω
R
N7C
33Ω
R
N7D
33Ω
R
N8A
33Ω
R
N8B
33Ω
R
N1B
33Ω
R
N1C
33Ω
R
N2A
33Ω
R
N2B
33Ω
R
N2C
33Ω
R
N2D
33Ω
R
N3A
33Ω
R
N3B
33Ω
R
N3C
33Ω
R
N3D
33Ω
R
N4A
33Ω
R
N4B
33Ω
R
N4C
33Ω
R
N4D
33Ω
C12 0.1µF
C10 0.1µF
OF
OGND
D13 D12 D11
OV
DD
D10
D9 D8 D7
OGND
GND GND
D6 D5 D4
OV
DD
D3 D2 D1 D0
OGND
CLKOUT
OE
SENSE V
CM
GND A
IN
+
A
IN
–
GND V
DD
V
DD
GND REFLB REFHA GND GND REFLA REFHB GND V
DD
V
DD
GND V
DD
GND MSBINV ENC ENC
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
2OE 2Q8 2Q7
GND
2Q6 2Q5
V
CC
2Q4 2Q3
GND
2Q2 2Q1 1Q8 1Q7
GND
1Q6 1Q5
V
CC
1Q4 1Q3
GND
1Q2 1Q1 1OE
2LE 2D8 2D7 GND 2D6 2D5 V
CC
2D4 2D3 GND 2D2 2D1 1D8 1D7 GND 1D6 1D5 V
CC
1D4 1D3 GND 1D2 1D1 1LE
24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
U4
P174VCX16373V
U5
LTC1744
C19 0.1µF
C20 0.1µF
C21 0.1µF
C22 0.1µF
1744 TA01
C28 0.1µF
J2
3201S-40G1
3V
U2
10T74ALVC1G86
JP2
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
IN TAB
OUT
GND
U1
LT1460-2.5
V
DD
V
OUT
C17 4.7µF
C16 10µF
E1
5V
E2
PGND
3V
C23
0.1µF
JP4JP3
5V
INPUT
RANGE
SELECT
TWO
COMPLEMENT
SELECT
R
Y
*
C24** 18pF
C25** 18pF
C2 4.7µF
C1
4.7µF
5V 5V
*RX, RY = INPUT RANGE SET **DO NOT INSTALL C24, C25, R1, R9 AND R10
J1
ANALOG
INPUT
ENCODE
INPUT
J3 J4
C5 18pF
C29
TBD
R1**
0Ω
R10**
0Ω
R9**
10Ω
R8
0Ω
R2
37Ω
T1
MINICIRCUITS T1-1T
R4 100Ω
R3 100Ω
••
R11
50Ω
R22 100Ω
T2
MINICIRCUITS T1-1T
••
R24
2k
R23
3k
R21 100Ω
R7
37Ω
J5
C6
2.2µF
C13
0.15µF
C18
4.7µF
C26
0.15µF
C7
0.15µF
C8
4.7µF
C9 0.15µF
C27
0.15µF
C15
0.15µF
R
X
*
C14
0.15µF
C11
1µF
E3
GND
E4
GND
E5
GND
GND