Philips Semiconductors

Product specification

SA625

High performance low power mixer FM IF system

with high-speed RSSI

1997 Nov 07

6

20

RSSI

OSCILLATOR

LIMITER

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

IF AMP

MINI–CIRCUIT ZSC2–1B

MUTE

RSSI

OUTPUT

AUDIO UNMUTED

AUDIO

C14

IFT1

C13

C12

C11

C10

C9

C8

C7

C6

R9

R10

R11

X1

R7

30.5

L2

SW3

SW4

SW1

VCC

EXT.

LOC

OSC

44.545

45MHZ

R3

R1

R2

SW2

C3

C4

R4

51.1

C5

C2

C1

L1

R6

178

R8

39.2

”C” WEIGHTED

AUDIO

MEASUREMENT

CIRCUIT

45.06

MHZ

50.5

2430

3880

96.5

32.6

71.5

C24

C22

C20

C19

C18

C15

C16

C17

FLT2

SW7

SW6

SW5

SW8

SW9

C23

C21

R17

5.1k

FLT1

-

25dB,

1500/50

-

10dB,

50/50

-

29dB,

929/50

-

10.6dB,

50/50

-

36dB,

156k/50

100pF NPO Ceramic

390pF NPO Ceramic

22pF NPO Ceramic

1nF Ceramic

10.0pF NPO Ceramic

10pF NPO Ceramic

100nF

±10% Monolithic Ceramic

100nF

±10% Monolithic Ceramic

100nF

±10% Monolithic Ceramic

100nF

±10% Monolithic Ceramic

15nF

±10% Ceramic

100nF

±10% Monolithic Ceramic

150pF

±2% N1500 Ceramic

100nF

±10% Monolithic Ceramic

6.8

C21

C23

C25

Flt 1

Flt 2

IFT 1

L1

L2

X1

R9

R17

R10

R11

100nF

±10% Monolithic Ceramic

100nF

±10% Monolithic Ceramic

100k

±1% 1/4W Metal Film (optional)

100k

±1% 1/4W Metal Film (optional)

5.1k

±5% 1/4W Carbon Composition

100k

±1% 1/4W Metal Film

44.545MHz Crystal ICM4712701

0.8

Toko 292CNS–T1038Z

455kHz (Ce = 180pF) Toko RMC–2A6597H

Ceramic Filter Murata SFG455A3 or equiv

Ceramic Filter Murata SFG455A3 or equiv

100nF

±10% Monolithic Ceramic

147–160nH Coilcraft UNI–10/142–04J08S

C1

C2

C5

C6

C7

C8

C9

C10

C11

C12

C13

C14

C15

C17

C18

QUAD

DETECTOR

MUTE

SWITCH

MIXER

700

Automatic Test Circuit Component List

EMITTER

BASE

1.3k

51.7

71.5

96.5

32.8

51.5

*NOTE: This value can be reduced when a battery is the power source.

SR00458

Figure 3. SA625 45MHz Test Circuit (Relays as shown)