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ICs for FM/AM Tuner
AN7261FBQ
FM multiplex reception IC
■ Overview
The AN7261FBQ is an FM-multiplex reception IC
including a front-end and an IF block for FM tuner. Since
the receiving circuit of FM multiplex signal is integrated
on a single chip, it is most suitable for saving the space of
sets.
■ Features
• A single chip IC for an FM-multiplex tuner block, which
was conventionally composed of two ICs.
• Fewer external components
• Can be used for 15 MHz IF
■ Applications
• VICS, RDS
■ Block Diagram
adj.
C
Band23V
V
REF
GND1
25
26
24
V
REF
22
Mute adj.
21
20
IF
det.
19
24 17
25
32
18
0.1±0.1
7.0±0.3
9.2±0.4
LQFP032-P-0707
CC1
V
18
17
16
AFC
Mute
15
SD adj.
Unit : mm
16
–0.05
+0.10
0.3
7.0±0.3
0.8
9
–0.05
+0.10
0.15
(0.55)
0.625±0.100 0.625±0.100
9.2±0.4
1.4±0.2
27
IF
limiter
28
29
V
C
30
Level
det.
AGC
Band det.
SD
IF counter
14
13
12
11
Det.
GND2
amp.
31
10
OSC
OSC
1
IF
amp.
8
N.C.
9
AGC
Mix.
2
3
4
5
6
7
CC2
RF in
V
ADX
32
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AN7261FBQ ICs for FM/AM Tuner
■ Pin Descriptions
Pin No. Description
1 1st IF input
2 GND for 1st IF input
3 Mixer output 1
4 Mixer output 2
5 PIN diode driver
6 Mix. Input
7V
CC2
8N.C.
9 AGC output
10 OSC buffer output
11 GND2
12 OSC
13 SD/IF counter output
14 Detection output
15 SD sensitivity adjustment
16 AFC voltage output
Pin No. Description
17 Higher freguency correction adjustment
18 V
CC1
19 FM detection
20 2nd IF output
21 Mute adjustment
22 Mute voltage output
23 Control voltage adjustment
24 Band mute SW/band signal output
25 V
REF
26 GND1
27 2nd IF input
28 GND for 2nd IF input
29 Control voltage output
30 Keyed-AGC input
31 AGC sensitivity adjustment
32 1st IF output
■ Absolute Maximum Ratings
Parameter Symbol Rating Unit
Supply voltage V
Supply current I
2
Power dissipation
Operating ambient temperature
Storage temperature
Note)*1: Ta = 25°C except power dissipation, operating ambient temperature and storage temperature.
2: Ta = 80°C
*
*
1
*
1
*
CC
CC
P
D
T
opr
T
stg
9.1 V
66 mA
343.6 mW
−30 to +80 °C
−55 to +150 °C
■ Recommended Operating Range
Parameter Symbol Range Unit
Supply voltage V
CC
7.2 to 9.0 V
2
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ICs for FM/AM Tuner AN7261FBQ
■ Electrical Characteristics at VCC = 8 V, f
= 98 MHz, f
IN1
= 15 MHz, Ta = 25°C
IN2
Parameter Symbol Conditions Min Typ Max Unit
Control voltage 1 V
Control voltage 2 V
Control voltage 3 V
Control voltage 4 V
Control voltage 5 V
Control voltage 6 V
Detection output level 1 V
No signal input, DC voltage of pin 29 0.0 0.05 0.8 V
C1
V
C2
C3
C4
C5
C6
O1
= 60 dBµ, DC voltage of pin 29 0.7 1.25 1.8 V
IN2
V
= 80 dBµ, DC voltage of pin 29 1.8 2.4 3.0 V
IN2
V
= 100 dBµ, DC voltage of pin 29 3.0 3.7 4.4 V
IN2
VC5 = VC3−V
VC6 = VC4−V
V
= 80 dBµ/1 kHz, 30%FM, 70 90 110
IN2
C2
C3
1.0 1.2 1.4 V
1.05 1.25 1.45 V
mV[rms]
AC voltage of pin 14
Detection output level 2 V
O2
= 80 dBµ/76 kHz, 10%FM, 37 47 57
IN2
mV[rms]
V
AC voltage of pin 14
Counter output level V
IFC
V
= 100 dBµ, V15 = 2 V, 150 180 210
IN2
mV[rms]
IFC output level
SD sensitivity SDSV
SD bandwidth SD
Limiting sensitivity V
W
LIMVIN2
when V15 = 2 V, SD > 4 V 61 71 81 dBµ
IN2
Bandwidth when
V
= 100 dBµ
IN2
SD > 4 V , 90 115 140 kHz
SD
level, 30 kHz LPF on, and 1 kHz 4 0 48 54 dBµ
30% FM when pin 14 AC voltage
drops by 3 dB
Local oscillation buffer output V
IF output level V
AGC sensitivity S
High-level AGC voltage V
Low-level AGC voltage V
Supply current I
Note) FM tuning condition: Adjust the VT of application voltage so that OSC buffer output frequency becomes 113 MHz±10 kHz.
OSfOSC
IF
AGCVIN1
AH
AL
TOT
= 113 MHz, without input 110 160 210
V
= 80 dBµ, IF out level 60 110 1 7 0
IN1
mV[rms]
mV[rms]
level when V9 = 3 V 68 72 76 dBµ
V
= 66 dBµ, V
IN1
V
= 78 dBµ, V
IN1
9
9
5.9 6.3 6.7 V
0.05 0.5 V
Without input 41 52 65 mA
■ Usage Notes
1. Use less than 10 kΩ of external resistor of pin 31
2. Use this IC not to exceed allowable power dissipation value refering to the "■ Technical Information".
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AN7261FBQ ICs for FM/AM Tuner
■ Technical Information
1. PD Ta curves of LQFP032-P-0707
P
T
D
a
1.600
1.400
1.388
1.200
1.000
(W)
D
0.800
0.613
0.600
Power dissipation P
0.400
0.200
0.000
Independent IC
without heat shink
R
th(j-a)
0
= 203.7°C/W
25 50
Mounted on standard board
(grass epoxy : 50 mm × 50 mm × t0.8 mm)
= 90.0°C/W
R
th(j-a)
75 100 125 150
Ambient temperature Ta (°C)
2. Specification for special parts
Part Maker
IF coil Sumida 4162-T006 4-6 10T 12 pF±10% 50 or more
Detection Matsushita SQF5EB033A 1-3 11T 0.59 µH41±20%
coil electronics ±5.0% (15 MHz)
parts
Maker
part number
Connection
3
4
2
1
6
3
4
2
1
6
Pin No.
1-2 11T (15 MHz)
2-3 11T
Specification
Turns LC value Q at no load
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ICs for FM/AM Tuner AN7261FBQ
■ Application Circuit Example
Band
V
CC
adj.
C
V
50 kΩ
0.1 µF
V
REF
24
23
22
25
0.1 µF
GND1
26
300 Ω
100 kΩ
18 pF
Mute adj.
21
20
180 pF
19
2.2 kΩ
CC1
V
18
100 pF
17
16
15
1 µF 3.9 kΩ
SD adj.
100 kΩ
0.1 µF
100 µF
AFC
Seek
27
28
V
C
0.01 µF
50 kΩ
100 kΩ
0.01 µF
10 kΩ
29
30
31
32
1
2
3
4
5
6
CC2
V
14
13
12
11
10
27 pF 3 pF
GND2
1000 pF
1000 pF
1000 pF
51 kΩ
Det.
IFC
SD
1000 pF
VT
OSC
9
7
8
1 µF
N.C.
470 Ω
330 Ω
ADX
RF in
AGC
5
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