
LTC6412
19
6412fa
Figure 3. Demo Board DC1464A Circuit Schematic. Test Circuit A
APPLICATIONS INFORMATION
VCC GND SHDN
LTC6412
EN GND VCC
DECL1
GND
+IN
–IN
VCM
VCC
GND
1
2
C5
10nF
VCC
C2 1000pF
C3 0.1μF
C2 1000pF
C4 0.1μF
C8
10nF
C13
1000pF
C14
0.1μF
C16
1000pF
C22
0.1μF
C15
0.1μF
C11
10nF
C17
0.1μF
CA1
1μF
CB1
4.7μF
NOTE:
[1] DO NOT PLACE
C12
1000pF
C21
0.1μF
+OUT
–OUT
C6
0.1μF
C9
[1]
C20
[1]
C7 0.1μF
VCC
R17
100Ω
T1
1:1
3
1
2
3
5
R7
[1]
R9
0Ω
4
0dB
+IN
–IN
4
5
6
18
24
23
22
21
20
19
78
9
10
11
12
17
16
15
14
13
+OUT
–OUT
GND
DECL2
VCC
GND +VG VREF –VG GND
VCC
GND
3.00V TO 3.60V
T3
1:1
T4
1:1
13
2
1
4
5
C18 0.1μF
C19 0.1μF
2
3
5
R21
0Ω
4
TEST IN
TEST OUT
6412 F03
R15 0Ω
T2
4:1
1
2
3
5
4
R14 [1]
VGAIN
+VG
–VG
R18 [1]
R20
100Ω
R19 0Ω
R5
1k
R6
1k
R3
[1]
R1
1k
R4
1k
R2
[1]
VCC
SHDN EN
R22
0Ω
BALUN
T1, T3, T4
T2
PART NUMBER
TYCO MABA-007159
MINI-CIRCUITS TCM4-19+
Figure 4. 4-Port Analysis Schematic. Test Circuit B
V
CC
SHDN
EN
GND
V
CM
V
REF
DECL1
DECL2
+V
G
–V
G
+IN
10nF
3.3V
1nF
0.1μF
+OUT
IDC
–OUT
6412 F04
0.1μF
GAIN CONTROL
(– SLOPE MODE)
INPUT REF
PLANE
OUTPUT REF
PLANE
LTC6412
–IN
PORT 3
50Ω
PORT 4
50Ω
1/2 AGILENT
E5071C
PORT 1
50Ω
PORT 2
50Ω
1/2 AGILENT
E5071C
IDC