TEA5570 データシートの表示（PDF） - Philips Electronics

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TEA5570

RF/IF circuit for AM/FM radio

Philips Electronics 

Philips Semiconductors

RF/IF circuit for AM/FM radio

Product specification

TEA5570

PARAMETER

SYMBOL MIN.

TYP. MAX. UNIT

Indicator/level detector (pin 12)

Indicator current

D.C. output voltage

at Vi = 300 µV

at Vi = 2 mV

AM to FM switch

Switching current at V3-16 < 1 V

I12

−

V12-16

−

V12-16

−

−I3

−

250

325

µA

0,25

−

V

1,0

−

V

−

400

µA

Notes to the characteristics

1.

2.

Oscillator operates at V7-16 > 2,25 V.

I.F. suppression is defined as the ratio

input voltage at f = 1 MHz.

α

=

20

log

VV-----ii-12-

where: Vi1 is the input voltage at f = 455 kHz and Vi2 is the

3. Oscillator voltage at pin 8 can be preset by Rosc (see Fig.10).

4. Maximum current into pin 5 can be adjusted by R1 (see Fig.10); I5 = -V----R3---–-1---1--6- − I3 when V3-16 = 800 mv; I3 = 400 µA.

5. AM suppression is measured with fm = 1 kHz, m = 0,3 for AM; fm = 400 Hz, ∆f = ± 22,5 kHz for FM.

Facility adaptation

Facility adaptation is achieved as follows (see Fig.10):

FACILITY

COMPONENT

FM sensitivity

AM sensitivity

AM oscillator biasing

AM output voltage

AM a.g.c. setting

R1 fixes the current at pin 5 (I5 = V-----R3---–-1---1--6- − 400 µA)

(gain adjustable ± 10 dB; see note 4)

R11 and coil tapping

Rosc

R7, R11

R7

September 1987

7

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