ICs for FM/AM Tuner
1
AN7208SA
TV/FM front-end IC for 1.5 V headphone stereo
s
Overview
The AN7208SA is a TV/ FM front-end IC developed
for use in the headphone stereo. It incorporates two
systems of FM and VHF band front-end. A pre-amp. be-
tween IF amp. is not necessary by combination with the
AN7233SH.
s
Features
Built-in two system of FM and VHF band front-end
Pre-amp. between IF amp. is not necessary (combina-
tion with the AN7233SH)
Built-in standby /IF gain control/local oscillator buffer
circuits
s
Applications
1.5 V headphone stereo (V
CC
1.0 V to 2.0 V)
s
Block Diagram
SSOP020-P-0225A
Unit : mm
6.5
0.3
1
10
20
11
4.3
0.3
6.3
0.3
0.65
(0.33)
Seating plane
Seating plane
0.25
0.10
0.1
0.1
1.5
0.2
0.65
0.10
0.65
0.10
(0.50)
0.15
+
0.10
-
0.05
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
FM
RF
TV
RF
TV
mix.
1st
IF amp.
2nd
IF amp.
FM
mix.
FM
OSC
TV
OSC
Power
OSC
buffer
AN7208SA
ICs for FM/AM Tuner
2
Pin No.
Description
1
FM RF input
2
TV RF input
3
GND 1
4
N.C.
5
IF out 1
6
Mode SW
7
IF in
8
IF gain control
9
IF out 2
10
GND 2
Pin No.
Description
11
V
CC2
12
STDBY
13
TV OSC 1
14
TV OSC 2
15
OSC buff.
16
FM OSC 1
17
FM OSC 2
18
TV RF
19
FM RF
20
V
CC1
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Pin Descriptions
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Absolute Maximum Ratings
Parameter
Symbol
Rating
Unit
Supply voltage
V
CC
2.5
V
Supply current
I
CC
12
mA
Power dissipation
P
D
30
mW
Operating ambient temperature
*1
T
opr
-
20 to
+
75
C
Storage temperature
*1
T
stg
-
55 to
+
125
C
Note) *1 : All items are at T
a
=
25
C, except for the operating ambient temperature and storage temperature.
s
Recommended Operating Range
Parameter
Symbol
Range
Unit
Supply voltage
V
CC
1.0 to 2.0
V
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
TV f
IN
=
221.75 MHz
Conversion gain
*1
G
CONV(TV)
f
OUT
=
10.6 MHz
30
38
46
dB
Oscillation voltage
V
OSC(TV)
V
CC
=
0.95 V
15
27
mV[rms]
S/N
*2
S/N
(TV)
Input level
=
60 dB
41
44
dB
1 kHz 30
%
Mod.
Quiescent current
I
TOT(TV)
8.8
12
mA
Oscillation buffer output
V
BUF(TV)
V
CC
=
0.95 V
39
62
mV[rms]
s
Electrical Characteristics at V
CC
=
1.2 V, T
a
=
25
C
Note) Tuning is taken the peak point at 10.6 MHz output level ( V
IN
=
30 dB
, non-modulation)
*1 : Conversion gain
=
20 Log(
V (
V)
31.6)
V is the output difference at V
IN
=
30 dB
and at V
IN
=
36 dB
*2 : Measurement is done at the detection output of the AN7233
Measure the ratio of output at f
DIV
=
22.5 kHz to that at f
DIV
=
0 Hz (modulation freq. 1 kHz)
ICs for FM/AM Tuner
AN7208SA
3
Pin No.
Equivalent circuit
Description
Input resistance or pin voltage
1
FM RF input
Approx. V
CC
-
0.7 V
RF signal input in FM band
(Common base type)
2
TV RF input
Approx. V
CC
-
0.7 V
RF signal input in TV band
(Common base type)
s
Terminal Equivalent Circuits
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
TV f
IN
=
221.75 MHz (continued)
Burst noise
*3
V
NO(TV)
Input level
=
60 dB
-
1.8
1.8
mV[p-0]
Non-modulation
FM f
IN
=
107.88 MHz
Conversion gain
*1
G
CONV(FM)
f
OUT
=
10.6 MHz
30
38
46
dB
Oscillation voltage
V
OSC(FM)
V
CC
=
0.95 V
40
63
mV[rms]
S/N
*2
S/N
(FM)
Input level
=
60 dB
48
51
dB
1 kHz 30
%
mod.
Quiescent current
I
TOT(FM)
7.7
10
mA
Oscillation buffer output
V
BUF(FM)
V
CC
=
0.95 V
66
132
mV[rms]
Burst noise
*3
V
NO(FM)
Input level
=
60 dB
-
1.8
1.8
mV[p-0]
Non-modulation
s
Electrical Characteristics at V
CC
=
1.2 V, T
a
=
25
C (continued)
Note) Tuning is taken the peak point at 10.6 MHz output level ( V
IN
=
30 dB
, non-modulation)
*1 : Conversion gain
=
20 Log(
V (
V)
31.6)
V is the output difference at V
IN
=
30 dB
and at V
IN
=
36 dB
*2 : Measurement is done at the detection output of the AN7233
Measure the ratio of output at f
DIV
=
22.5 kHz to that at f
DIV
=
0 Hz (modulation freq. 1 kHz)
*3 : Measurement is done at the detection output of the AN7233
Measures a peak voltage of the measurement time
=
within 500 ms (OK to 10 times)
1
19
To mix.
2
18
To mix.
AN7208SA
ICs for FM/AM Tuner
4
s
Terminal Equivalent Circuits (continued)
Pin No.
Equivalent circuit
Description
Input resistance or pin voltage
3
GND 1
GND pin
(RF, mix. block)
4
N.C.
5
IF out 1
Approx. 330
Approx. V
CC
-
0.7 V
Outputs IF signal of TV/FM
6
Mode SW
Switch of band switching
V
CC
: TV mode
Open/GND : FM mode
7
IF in
Approx. 5 k
IF amp. block input
5
6
V
CC
7
ICs for FM/AM Tuner
AN7208SA
5
Pin No.
Equivalent circuit
Description
Input resistance or pin voltage
8
IF gain control
Approx. 700
Approx. 0.7 V
IF amp. block gain can be decreased
by inserting a resistance to GND.
9
IF out 2
Approx. 330
Approx. V
CC
-
0.7 V
IF amp. block output
10
GND
GND pin
(IF, OSC block)
11
V
CC2
Power supply pin
(IF, OSC block)
12
STDBY
Standby switch
V
CC
/open : IC off
GND : IC operates
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Terminal Equivalent Circuits (continued)
8
9
12
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