ICs for FM/AM Tuner
1
AN7289NFBQ
FM-FE
+
AM IC for car radio
s
Overview
The AN7289NFBQ is an IC having FM-FE
+
AM
functions for car radio. A tuner block of car radio can be
constructed by using this IC and the AN7293NSC/NFBQ.
s
Features
A less number of electrolytic capacitors is required (3
capacitors reduction compared with our conventional
IC)
AM: Effective sensitivity is improved by 2 dB through
ATC
AM: Strong-input characteristic is improved by 2-loop-
AGC function
The AN7289NSC of DIL package type is also available
s
Applications
Car radios
LQFP032-P-0707
Unit : mm
s
Block Diagram
20
19
18
17
24
23
22
21
12
11
10
9
16
15
14
13
5
6
7
8
1
2
3
4
28
27
26
25
32
31
30
29
V
CC
AM-AF
OUT
Keyed-AGC in
V
AOSC
GND2
V
FOSC
AM-IF count
AM-SD out
AM-S. meter
AM-IF out
GND1
FM-mix. in
FM-PIN D
FM/AM SW
AM. S-meter
FM
AGC
AM
OSC
FE
OSC
AM
ATC
AM
det.
AM
SSC
FM
mix.
FM
IF amp.
AM
IF amp.
AM
mix.
AM
RF
AGC
AM
IF AGC
7.00.3
(0.55)
1.40.2
0.6250.100
0.6250.100
0.10.1
9.20.4
7.00.3
0.8
9.20.4
0.3
+0.10
0.05
0.15
+0.10
0.05
1
8
24
17
9
16
32
25
AN7289NFBQ
ICs for FM/AM Tuner
2
Pin No.
Description
17
FM-PIN diode driver
18
AM-OSC coil pin
19
FM-mix. output 2
20
FM-mix. output 1
21
FM-PIN diode driver
22
FM-mix. input
23
V
CC2
/FM/AM SW
24
FM-AGC output
25
FM-OSC buffer output
26
AM-OSC buffer output/FE-AGC sensitivity setting
27
GND2
28
FM-OSC coil pin
29
FM-keyed-AGC input
30
AM-AM output/LO setting
31
AM-ATC input
32
AM-IF level detection
s
Pin Descriptions
Pin No.
Description
1
AM detection output
2
V
CC1
3
AM-IF counter output/DX/LO SW
4
AM-SD output
5
AM-signal meter output
6
FM-IF output
7
AM-IF output
8
GND1
9
SSC
10
AM-RF level detection
11
AM-WAGC detection/DX setting
12
AM-IF input
13
AM-mix. output
14
FM-IF input
15
AM-RF gain control
16
AM-mix. input
Parameter
Symbol
Rating
Unit
Supply voltage
V
CC
9.1
V
Supply current
I
CC
56
mA
Power dissipation
*2
P
D
343.3
mW
Operating ambient temperature
*1
T
opr
-
35 to
+
80
C
Storage temperature
*1
T
stg
-
55 to
+
125
C
Parameter
Symbol
Range
Unit
Supply voltage
V
CC
7.2 to 9.0
V
s
Recommended Operating Range
Note) *1: T
a
=
25
C except power dissipation, operating ambient temperature and storage temperature.
*2: Referring to "s Technical Information" for power dissipation at T
a
=
80
C, use the circuit under the conditions not exceeding
the allowable limit value.
s
Absolute Maximum Ratings
ICs for FM/AM Tuner
AN7289NFBQ
3
s
Electrical Characteristics at T
a
= 25C
AM mode at V
CC
=
8.0 V, f
IN2
=
1 MHz
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
AM consumption current 1
amL
T1
Without input
28
36
44
mA
AM consumption current 2
amL
T2
f
IN2
=
1 MHz, V
IN2
=
130 dB
33
41
49
mA
AM-AF output
amV
O
V
IN2
=
74 dB
, 400 Hz 30
%
,
105
135
160
mV
AM-AF output
AM signal-to-noise ratio
amSN
V
IN2
=
74 dB
, 400 Hz 30
%,
48
52
58
dB
AM-AF output S/N
AM-AGC width
amW
V
IN2
=
74 dB
, 400 Hz 30
%,
56
60
64
dB
AM-AF output
-
10 dB input change
AM-ATC operation
amATC
(Output ratio [dB] of 400 Hz and 3 kHz
3.5
6.5
9.5
dB
when V
IN2
=
18 dB
)
-
(output ratio
[dB] of 400 Hz and 3 kHz when V
IN2
=
74 dB
)
80
%
Mod., AM-AF
OUT
output
AM-distortion rate 1
amT1
V
IN2
=
74 dB
, 400 Hz 80
%,
0.01
0.5
1.5
%
AM-AF output distortion
AM-distortion rate 2
amT2
V
IN2
=
130 dB
, 400 Hz 80
%,
0.01
0.5
1.5
%
AM-AF output distortion
AM wide band AGC on input
amV
W
f
IN2
=
1.4 MHz, input when pin 15
96
102
108
dB
voltage becomes below 3 V
AM local oscillation buffer output amV
OS
Without input
160
210
260
mV
AM-IF count output 1
amIF1
V
IN2
=
40 dB
150
210
270
mV
AM-IF count output 2
amIF2
Without input
10
mV
AM-SD output 1
amSD1
V
IN2
=
40 dB
4.5
4.9
5.1
V
AM-SD output 2
amSD2
Without input
0.0
0.2
0.5
V
AM signal meter output 1
amV
S1
Without input, pin 5 voltage
1
50
200
mV
AM signal meter output 2
amV
S2
V
IN2
=
30 dB
, pin 5 voltage
0.8
1.05
1.3
V
AM signal meter output 3
amV
S3
V
IN2
=
130 dB
, pin 5 voltage
4.1
4.8
5.1
V
AM search sensitivity DX
amDX
AM-IF count output is over 120 mV
23
29
35
dB
V
IN2
when f becomes 450 kHz
2 kHz
AM search sensitivity LO
amLO
AM-IF count output is over 120 mV
43
49
55
dB
V
IN2
when f becomes 450 kHz
2 kHz
Note) FM tuning condition: Adjust V
ATU
voltage so that V
AOSC
output frequency becomes 1 450 kHz
500 Hz
AN7289NFBQ
ICs for FM/AM Tuner
4
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
FM local oscillation buffer output
fmV
OS
f
OSC
=
108.7 MHz, without input
140
200
260
mV
FM-IF output level
fmIF
V
IN1
=
71 dB
40
75
110
mV
FM-AGC sensitivity
fmAGC
V
IN1
level when V
24
becomes 3 V
60
64
68
dB
High-level FM-AGC voltage
fmV
AH
V
IN1
=
70 dB
6.0
6.4
6.8
V
Low-level FM-AGC voltage
fmV
AL
V
IN1
=
82 dB
0.05
0.5
V
FM consumption current
fmI
T
Without input
26
35
44
mA
s
Electrical Characteristics at T
a
= 25C (continued)
FM mode at V
CC
=
8.0 V, f
IN1
=
98 MHz
Note) FM tuning condition: Adjust V
FTU
voltage so that V
FOSC
output frequency becomes 108.7 MHz
10 kHz.
s
Technical Information
P
D
T
a
curves of LQFP032-P-0707
P
D
T
a
1.200
1.000
1.600
1.388
1.400
0.800
0.600
0.400
0.200
0.613
0.000
0
25
50
Independent IC
without heat shink
R
th(j-a)
=
203.7
C/W
Mounted on standard board
(grass epoxy : 50 mm
50 mm
t0.8 mm)
R
th(j-a)
=
90.0
C/W
75
100
125
150
Ambient temperature T
a
(
C)
Po
wer dissipation P
D
(W)
ICs for FM/AM Tuner
AN7289NFBQ
5
20
19
18
17
24
23
22
21
12
11
10
9
16
15
14
13
5
6
7
8
1
2
3
4
28
27
26
25
32
31
30
29
V
CC
V
CC
AM-
AF
OUT
Keyed-AGC in
FE-VT
V
AOSC
V
FOSC
AM-IF count
AM-SD out
AM-S. meter
AM-IF out
GND1
FM-mix. in
FM
AM
FM-PIN D
12 k
5.6 k
10 k
10 k
3.9 k
50 k
5 k
510 k
100 k
10 k
10 k
100 k
100 k
510 k
0.22
F
0.01
F
100
F
0.022
F
0.022
F
0.022
F
1
F
0.1
F
0.022
F
0.1
F
0.1
F
100
F
0.1
F
0.047
F
0.1
F
0.01
F
8.2
H
0.047
F
Seek on
5 V
off
LO
DX/LO
DX
MS3
SFPS-450H
AM-ANT
AM-VT
0.22
F
0.022
F
1000 pF
33 pF
3 pF
3 pF
1 pF
3 pF
4 pF
10
2SK435
2SC828A
GND2
s
Application Circuit Example
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