Panasonic AN7243S Datasheet

ICs for FM/AM Tuner

■ Overview

The AN7243S is an FM front-end IC designed for DTS except RF amp. of car radio. It is built-in local oscillation frequency buffer output and PIN diode (ADX) driver for antenna damping.

■ Features

•

High sensitivity · High S/N ratio

•

Good IM characteristics at strong input

•

Timing for AGC input level is variable.

•

Built-in pre-IF-Amp. having negative (positive) temper-

ature characteristics to RF amp.

AN7243S

FM Front-end Circuit for Car Radio

Unit : mm

14 13 12 11 10 9 8

1.24

0.4±0.25

1.27

0.1±0.1

0.3

1.5±0.2

0.65

0.15

1 2 3 4 5 6 7

6.5±0.3

4.2±0.3

10.1±0.3

14-Lead SOP Package (SOP014-P-0225)

■ Block Diagram

GND

14 13 12 11 10 9 8

ADX Driver

OSC AGC & Det.

1 2 3 4 5 6 7

V

Mix.

IF-Amp.

Buffer

CC

ICs for FM/AM Tuner

AN7243S

■ Absolute Maximum Ratings (Ta=25˚C)

V

CC

I

CC

P

D

T

opr

T

stg

Supply Voltage Supply Current Power Dissipation Operating Ambient Temperature Storage Temperature

V

mA

mW

˚C ˚C

Parameter Symbol Rating Unit

9.6 50

380

–40 ~ + 80

–55 ~ + 125

■ Recommended Operating Range (Ta=25˚C)

Parameter Symbol Range

Operating Supply Voltage Range

V

CC

6.5V ~ 9.6V

V

in

=17dBµ no conversion

However, S= output at 400Hz 30%conversion

f

OSC

=108.7MHz

Measured by Pin4, No signal No modulation, V

in

= 53dBµ

Input level at V

AGC

= 3V

V

in

= 72dBµ

V

in

= 58dBµ

At S

1

ON, difference between

input level at V

AGC

= 3V and

AGC maximum sensitivity V

in

= 72dBµ

V

in

= 63dBµ

Parameter Symbol Condition min. typ. max. Unit

■ Electrical Characteristics (V

CC

= 8V, f

in

= 98MHz, 400Hz 30%Modulation, S1 : Open, Ta= 25˚C)

S/N Ratio

Local Oscillation Output Level IF Output Level

AGC Maximum Sensitivity AGC Level (L) AGC Level (H)

AGC Sensitivity Variable Range

ADX Drive Current ADX Leak Current

N

OUT

V

OSC

V

OUT

S

AGC

V

AGC(L)

V

AGC(H)

I

X(max.)

I

X(leak)

22

160

41 60

6

18

20

30

250

58 65

0.02

6.6

330

82 70

0.5

1

dB

mV mV

dBµ

V V

dB

mA

µA

I

tot

– VCC

25

20

15

10

5

0

V

CC

(V)

I

tot

(mA)

60 2 4 12108

IF – Amp. Input/Output

Characteristics

120

100

80

60

IF IN (MHz)

IF OUT (dBµ)

40 60 80 100 120

AGC Start Point Variable Axis

AN7243S

IF IN

IF OUT

0.01µF

330Ω

10

8

6

4

2

0

V

in

(dBµ)

I

AGC

(V)

0 10 60 70 80 90 100 110

6.6V

AGC Adj. R = 0

AGC Adj. R = ∞

■ Characteristics Curve

ICs for FM/AM Tuner

AN7243S

AGC Freq. Characteristics

120

110

100

90

80

70

60

Input Frequency f

in

(MHz)

AGC Start Point (dBµ)

88 92 96 100 104 108

I

ADX

– V

ADX

8

7

6

5

4

3

2

1

0

I

ADX

(mA)

V

ADX

(V)

0 5 10 15 20 25 30 35

AGC Adj. R – AGC ON Level

85

75

65

AGC Adj R (

Ω)

AGC ON LEVEL (dBµ)

0 10 100 1000 ∞

V

AGC

(H) Supply Voltage Characteristics

16

14

12

10

8

6

4

2

0

V

CC

(V)

V

AGC

(H) (V)

4 6 8 10 12 14

IF Amp. Saturation Level

400

300

200

100

V

CC

(V)

Saturation Level (mV

rms

)

42 6 8 10 12 14

V

CC

=8V

Total Gain

=0dB

at Ta

=25˚C

Total Gain Temperature

Characteristics

4

3

2

1

0

–1

–2

–3

–4

–5

–6

T (˚C)

DTotal G (dB)

–40–60 –20 0 20 40 60 80 100

Mixer + IF Amp.

AGC ON Level

Temperature Characteristics

100

90

80

70

60

50

T (˚C)

V

in

(dBµ)

–40–60 –20 0 20 40 60 80 100

AGC ON LEVEL

R Adj =

∞

AGC ON LEVEL

R Adj

= 0

Ω

AGC ON Level

V

CC

Dependence

90

85

80

75

70

65

60

V

CC

(V)

V

in

(dBµ)

2 4 6 8 10 12 14 16

AGC ON LEVEL

R Adj = ∞

AGC ON LEVEL

R Adj = 0

Ω

OSC OUT – f

OSC

130

120

110

100

90

f

OSC

(MHz)

OSC

OUT

(dBµ)

50 60 70 80 90 100 110 120 130

V

CC

=8V

Input 115dB

µV

from SG to Pin2 Pin3

OPEN

C =3pF C

=10pF

AN7243S

SG

C

0.01µF

OSC OUT

3

2

AN7243S

50Ω +75Ω

103

AGC Adj. R

f

OSC

=108.7MHz