T4258-ILS datasheet(2/17 Pages) ATMEL

Part #	T4258-ILS

Description	AM/FM Receiver IC

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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2 / 17 page

T4258

Rev. A1, 10-Jan-01

2 (17)

Pin Description

Symbol

Function

1

MX1FMA

1st mixer FM input A

2

MX1FMB

1st mixer FM input B

3

MX1AMB

1st mixer AM input B

4

GNDMX

Ground 1st mixer

5

FMAGC

FM preamplifier AGC

6

AMVREG

AM control voltage

7

AMAGC

AM preamplifier AGC

8

AMPLPF

AM AGC LP filter

9

METER

Fieldstrength output

10

ADJAC

Adjacent channel detection output

11

MPX

Multiplex signal

12

V57

5.7 V reference voltage

13

OSCB

Oscillator basis

14

OSCE

Oscillator emitter

15

GNDOSC

Oscillator ground

16

OSCOUT

Oscillator output

17

EN

3-wire bus enable

18

CLK

3-wire bus clock

19

DATA

3-wire bus data

20

IF2OUT

2nd IF amplifier output

21

INT

Interrupt, stop signal, test out

22

MX2LO

10.25 MHz input for 2nd mixer

23

MX2OB

2nd mixer output B

24

MX2OA

2nd mixer output A

25

GND

Ground

26

MX2IN

2nd mixer input

27

V3P

3 V ref. for AMPIN, AMIFAGC, Control, IF2IN

28

IF2IN

2nd IF amplifier input

29

V3

3 V reference for IF1OUT, MX2IN

30

IF1OUT

1st IF amplifier output

31

DEV

Deviation detect output

32

OPLPF

Operating point LPF

33

IF1AMI

1st IF AM amplifier input

34

SMUTE

Soft MUTE control input

35

IFAGCH

IF AGC LP filter high time constant constant

36

IFAGCL

IF AGC LP filter low time constant

37

FILADJ

Filter adjust

38

IF1FMI

1st IF FM amplifier input

39

IF1REF

1st IF & MX1OUT ref., MX1AMA, MX1AMB

40

MULTIP

Multipath detection output

41

MX1AMA

1st mixer AM input A

42

VS

Supply voltage

43

MX1OA

1st mixer output A

44

MX1OB

1st mixer output B

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

44

43

42

41

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23