Panasonic AN7259S Datasheet

ICs for FM/AM Tuner

■ Overview

The AN7259S is an FM–IF/DET IC for car radio/car
stereo and has each function necessary for electronic­tuner.

■ Features

•

Quadrature detection system and fewer external parts

•

Good linearity of control voltage output used for AGC

and separation control, etc.

•

IF counter output and search output in channel selec­tion signal as electronic tuning and with IF counter out­put ON/OFF circuit (SSC)

•

Adjustment of search band width and search output

center frequency

•

Soft muting adjusting function

AN7259S

FM-IF Amplifier Circuit for Car Radio

20 19 18 17 16 15 14 13 12 11

1 2 3 4 5 6 7 8 9 10

FM IF Amp.

V

CONT.

Search

Counter
SSC

FM Det.

Mute
Amp.

GND V

CC

■ Block Diagram

Unit : mm

0.1±0.1

1.5±0.2

0.3

0.65

0.15

0.4

1
2
3
4
5
6
7
8
9

10

20
19
18
17
16
15
14
13
12
11

0.4±0.25

1.27

12.6±0.3

5.4±0.3

7.7±0.3

20-Lead SOP Package (SOP020-P-0300A)

AN7259S

ICs for FM/AM Tuner

■ Absolute Maximum Ratings (Ta=25˚C)

V

CC

I

CC

P

D

T

opr

T

stg

Supply Voltage
Supply Current
Power Dissipation (Ta = 75˚C)
Operating Ambient Temperature
Storage Temperature

V

mA

mW

˚C
˚C

Parameter Symbol Rating Unit

9.6
23

230

–30 ~ + 75

–55 ~ + 125

■ Recommended Operating Range (Ta=25˚C)

Parameter Symbol Range

Operating Supply Voltage Range

V

CC

7.3V ~ 9.6V

Input at VO = –3dB
V

in

= 70dBµ

V

in

= 0dBµ, Pin9 –14 voltage

V

in

= 0dBµ, Pin2 voltage

V

SIG4 –VSIG1

V

SIG5 –VSIG4

V

in

= 70dBµ, Pin2 voltage

V

in

= 100dBµ, Pin2 voltage

Band width at Pin4 DC voltage =

2.5V,

R = 30kΩ
V

in

= 0dBµ

Mod.

= 30%, V

in

= 100dBµ

Mod.

= 100%, V

in

= 100dBµ

Mod.

= 30%, V

in

= 100dBµ

Pin16, 10.7MHz Output
AM = 30% Mod.,

FM

= 30% Mod.

V

in

= 0dBµ

Referred to Input

Parameter Symbol Condition min. typ. max. Unit

■ Electrical Characteristics (V

CC

= 8V, FM 1kHz 30%Modulation, Ta= 25˚C)

V

lim

V

O

V

offset

V

SIG1

V

SIG2

V

SIG3

V

SIG4

V

SIG5

BW

I

tot

26.5
150

–240

0.19

2.51

1.15

2.92

4.11
145

15

30

32.5
210
240

0.85

3.33

1.75

3.98

5.56
185

23

dBµ

mVrms

mV

V
V
V
V
V

kHz

mA

%
%

dB

mVrms

dB
dB

dB

V

Ω

Limiting Sensitivity
Detection Output Level
AFC Offset Voltage
Signal Voltage (1)
Signal Voltage (2)
Signal Voltage (3)
Signal Voltage (4)
Signal Voltage (5)

Search Signal Band Width
Supply Current

THD
THD
S/N
IF Counter Output Level

AMR
Residual Noise Level

Control Voltage Adjusting Width
Reference Voltage
AF Output Impedance

29.5
175

0

0.52

2.92

1.45

3.4

4.8

165

19

0.1

0.3
63

250

50

–23

3.9

300

20
10

0
–10
–20
–30
–40
–50
–60
–70

–80

0 10 20 30 40 50 60 70 80 90 100 110 120

V

O

(dB)

Vin (dBµ)

Output Voltage, AMR –V

in

5

4

3

2

1

0

0 10 20 30 40 50 60 70 80 90 100 110 120

V

cont

(dB)

Vin (dBµ)

Control Voltage – V

in

SD Output Pin4

FM 1kHz, 30% Modulation

AM 1kHz, 30% Modulation

Mute Voltage Pin3

Control Voltage Pin2

0% Modulation
(Noise)

■ Characteristics Curve