Analog Devices AD6122 Manual page 19

MODCMREF
ICH
R6
50
MODCMREF
TO
TXVCC
TO
DVCC
TO
IFVCC
NOTES:
1. TO USE THE LDO REGULATOR, SHORT J2 AND OPEN J1.
2. TO BYPASS THE REGULATOR, SHORT J1 AND OPEN J2
3. TO CONNECT THE OUTPUT OF THE MODULATOR TO THE
INPUT OF THE IF AMP, SHORT J5 AND J6.
TO TEST THE MODULATOR AND THE IF AMP SEPARATELY,
OPEN J5 AND J6.
4. INDICATES A 50
REV. B
C15
0.1 F
+15V
SOIC PACKAGE
8
1
U2
R7
V–1
2
50
7
A=1
3
V–1
4
AD830
5
–15V
C16
0.1 F
C17
0.1 F
+15V
8
1
U3
R8
V–1
2
50
7
A=1
3
V–1
4
AD830
5
–15V
C18
0.1 F
VREG OUT
C6 R1
18pF 10
C13
0.01 F
R2
C5
18pF 10
C12
0.01 F
R3
C7
10
18pF
C14
0.01 F MODCMREF
TRACE.
Figure 34. Schematic Diagram of the Evaluation Board
TO
IIPP
MODCMREF
QCH
R9
50
TO
IIPN
MODCMREF
P1 P2
VPOS
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
–15V
19 20
–19–
AD6122
C19
0.1 F
+15V
SOIC PACKAGE
8
1
U4
R10
V–1
2
7 50
A=1
3
V–1
4
AD830
5
–15V
C20
0.1 F
C21
0.1 F
+15V
8
1
U5
R11
V–1
2
50
7
A=1
3
V–1
4
AD830
5
–15V
C22
0.1 F
L1
470nH
FROM VPOS
2.9V–4.2V
R4 R5
10k 10k
VREG OUT
PD1
REFOUT
VGAIN
PD1 PD2
+15V
PD2
TO
QIPP
TO
QIPN