AN7243S
OSC Buff OUT
V
CC
Dependence
Input/Output Characteristics
Example
(0.2061V)
0
120
–10
–20
V
in
(dBµ)
OSC Buff OUT
110
V
o
(dBµ)
–30
–40
30
ICs for FM/AM Tuner
Limiting Sensitivity,
Usable Sensitivity V
CC
Dependence
IF : AN7257S
V
in
(dBµ)
V
CC
= 8V
f
in
= 98MHz
f
m
= 1kHz, 30% Mod.
400Hz HPF 30kHz LPF
ON
20
Usable Sensitivity
100
–50
–60
90
–70
–10 0
10
Limiting Sensitivity
2
4
6
8
10
12
14
16
20
40
60
80
100
2
4
6
8
10
12
14
16
V
CC
(V)
V
in
(dBµ)
V
CC
(V)
Limiting Sensitivity,
Usable Sensitivity,
Temperature Characteristics
20
IF : AN7257S
40
Limiting Sensitivity,
Usable Sensitivity,
Frequency Characteristics
110
IM Characteristics (1)
f
D
=
98MHz, CW
f
UD1
=
98MHz +
∆f
UD
1kHz, 30% Mod.
f
UD2
=
98MHz + 2∆f
UD
, CW
100dBµ
Measure S
UD1
level
(Referred to Mix. In)
which can obtain
S/N
=
30dB IF is AN7257S
Usable Sensitivity
15
30
SUD1 (dBµ)
V
in
(dBµ)
V
in
(dBµ)
100
90
S
D
= 45dBµ
S
D
= 35dBµ
80
20
Usable Sensitivity
10
10
Limiting Sensitivity
Limiting Sensitivity
5
70
Sp
0.01µF
AN
7243S
0
–60 –40 –20
0
20
40
60
80 100
0
88
92
96
100
104
108
–5 –4 –3 –2 –1 0
S
UD1
S
UD2
1
2
Mixer
3
4
5
T (˚C)
f
in
(MHz)
∆f
UD
(MHz)
IM Characteristics (2)
130
120
110
100
90
S
D
(dBµ)
80
70
60
50
40
30
20
10
0
60
70
80
50Ω
Sp
S
UD1
S
UD2
1F : 7256S
50Ω→75Ω AN
0.01µF 7243S
To 1F
f
D =
98MHz, CW
f
UD1=
98MHz±∆f
UD
1kHz, 30%Mod.
f
UD2=
98MHz±2∆f
UD
, CW
400HzHPF, 30kHz LPF ON
IFT– CF Matching R
To IFT
330Ω
To CF
470Ω
Set S
UD1 and
S
UD2
up with the same
level, Measure S
D
level (Referred to
Mix. In) which can obtain S/N (30dB).
∆f
UD
= + 400Hz, + 800Hz
∆f
UD
= – 400Hz, + 800Hz
90 100 110 120 130
S
UD1
, S
UD2
(dBµ)
Mixer
PANASONIC [ PANASONIC SEMICONDUCTOR ]
