ATMEL Corporation U2510B-M Datasheet

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ATMEL Corporation U2510B-M Datasheet

U2510B

All-Band AM/FM Receiver and Audio Amplifier

Description

The U2510B is an integrated bipolar one-chip AM/FM radio circuit. It contains an FM front end with preamplifier, FM IF and demodulator, a complete AM

Features

Superior FM strong signal behavior by using RF AGC

Soft mute and HCC for decreasing interstation noise in FM mode

Excellent AFC performance (level controlled, both polarities available)

Level indicator (LED drive) for AM and FM

receiver, an AF amplifier and a mode switch for AM, FM and tape. This circuit is designed for clock radios and portable radio-cassette recorders.

DC mode control: AM, FM and tape

Wide supply-voltage range and low quiescent current

High AF output power: 1 W

Electronic volume control

Electronic AF bandwidth control (treble and high cut)

Output stage for headphone and speaker drive

Block Diagram

 

FM RF

 

FM osc.

IF BPE

 

 

 

(Replaceable)

 

 

tank

 

tank

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FM ant.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VS

 

 

 

9

8

7

6

14

16

 

 

2

26

28

FM RF

12

FM

 

AFC

 

 

FM IF

 

FM

 

27

 

 

 

 

 

 

 

BPE

 

front end

 

 

 

amp.

 

discr.

Power

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AFC

 

 

 

 

 

 

AGC

 

 

 

 

 

 

 

 

 

amp.

 

11

FM

 

 

control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

25

 

 

AGC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AM IF

 

 

 

 

23

AM

10

AM

 

 

amp. and

 

 

 

 

 

 

 

 

 

 

 

ant.

 

front end

 

detect.

 

 

 

 

 

 

IF

 

IF

 

 

 

 

24

 

 

 

 

 

 

 

 

 

AF preamp.

 

 

 

 

 

AGC

 

 

 

 

 

 

 

5

 

 

 

 

 

 

 

 

 

 

AM osc.

 

 

RF AGC

 

AM

Level

 

 

Volume

4

tank

 

 

 

 

 

AGC

indic.

 

 

 

 

Voltage stab.

AM/FM

 

 

 

 

 

 

 

 

 

 

 

Mute

 

 

VRef

and

 

 

 

 

 

 

 

HCC

 

 

mode control

 

 

 

 

 

 

 

 

 

15

 

 

21

13

20

19

1

22

18

 

 

 

AM

S

2

VS

 

 

 

 

 

 

 

 

 

 

 

 

 

LED

 

 

 

 

 

 

 

Tape

 

 

 

 

 

 

 

 

 

FM

AFC mode

 

 

VS

 

 

Treble

Vol

 

 

 

 

 

 

 

 

 

 

 

13912

Figure 1. Block diagram

Rev. A3, 23-Feb-01

1 (15)

U2510B

Order Information

Extended Type Number

Package

Remarks

U2510B-M

SDIP28

 

U2510B-M__T

SDIP28

VS < 6 V supply voltage

Pin Description

 

Mute

 

 

 

 

 

AF-GND

 

 

1

 

 

28

FM-discr

 

 

 

 

 

AFout

 

 

 

 

 

 

2

 

 

27

 

CF

 

 

 

 

 

 

 

 

3

 

 

26

VS

Vol ctrl in

 

 

 

 

 

Ripple in

 

4

 

 

25

AMOsc

 

 

 

 

 

AFin

 

 

 

 

 

 

5

 

 

24

FM-AFC

 

 

 

 

 

AM/FM detect

 

 

 

 

 

 

6

 

 

23

FMOsc

 

 

 

 

 

VAGC/AFC

 

 

 

 

 

 

7

 

 

22

 

VRef

 

 

 

 

 

AFC switch

 

 

8

 

 

21

FMtank

 

 

 

 

 

IF-GND

 

9

 

 

20

AMtank

 

 

 

 

 

LED drive

 

 

 

 

 

10

 

 

19

 

 

 

 

 

VTreble in

FM-AGC

 

11

 

 

18

 

FMin

 

 

 

 

FM-IFin

 

 

12

 

 

17

FE-GND

 

 

 

 

AM-IFin

 

13

 

 

16

AM/FM

 

 

 

 

 

Mode ctrl

 

 

 

 

 

 

14

 

 

15

 

IFout

 

 

 

switch

 

 

 

 

14812

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 2. Pinning

 

 

 

 

 

 

Pin

Symbol

Function

 

1

Mute

Mute voltage output, time constant (C23),

 

 

 

 

 

mute depth and threshold adjustable by load

 

 

 

 

 

resistance (R3)

 

2

FM-discr

FM discriminator filter connection, ceramic

 

 

 

 

 

resonator or equivalent LC-circuit

3

 

CF

Audio negative feedback input. Blocking

 

 

 

 

 

capacitor (C8) determines the audio amplifiers

 

 

 

 

 

low-end cut-off frequency

 

4

Vol ctrl in

Input for volume control voltage

Pin

Symbol

 

Function

5

AMOsc

AM oscillator tank circuit input, recommended

 

 

load impedance approximately 2.5 k

6

FM±AFC

AFC diode connection, coupling capacitor

 

 

(C19) determines the AFC characteristic

 

 

(holding range and slope)

7

FMOsc

FM oscillator tank circuit input, recommended

 

 

load impedance approximately 3 k

8

VRef

Regulated voltage output (2.4 V)

9

FMtank

FM RF tank circuit connection, recommended

 

 

load impedance approximately 3 k

10

AMtank

AM RF tank circuit connection, recommended

 

 

load impedance approximately 20 k

11

FM-AGC

FM AGC voltage output, time constant (C20).

 

 

Loading this pin by a resistor (to GND) will

 

 

increase the FM AGC threshold, grounding

 

 

this pin will switch off the FM AGC function

12

FMin

FM RF input (common-base preamplifier

 

 

transistor), recommended (RF) source

 

 

impedance approximately 100

13

FE-GND

FM front-end ground

 

 

14

AM/FM

AM/FM IF output

 

 

 

IFout

(collector output of the IF preamplifier)

15

Mode ctrl

Mode control input:

 

 

 

switch

 

Pin

| Function

 

 

 

 

open

| FM

 

 

 

Ground

| AM

 

 

 

VS (R4 = 10 k )

| Tape

16

AM-IFin

AM IF input, input impedance = 3.1 k

17

FM-IFin

FM IF input, input impedance = 330

18

VTreble in

Treble control voltage input

19

LED drive

Level indicator output

 

 

 

 

(open-collector output, LED drive)

20

IF-GND

IF ground

 

 

21

AFC switch

AFC function control input:

 

 

 

Pin

| Function

 

 

 

 

open

| AFC off

 

 

 

Ground

| fOSC > fin

 

 

 

VS

| fOSC < fin

22

VAGC/AFC

AGC/AFC voltage, time constant adjust (C10),

 

 

input impedance approximately 42 k

23

AM/FM

AM/FM detector output, the load capacitor

 

detect

(C11) in conjunction with the detector output

 

 

resistance (7.5 k ) determines the (FM)

 

 

deemphasis as well as the (modulation)

 

 

frequency response of the AM detector

24

AFin

Audio amplifier input, input resistance

 

 

approximately 100 k coupling capacitor

 

 

(C9) determines the low frequency response

25

Ripple in

Ripple filter connection. Load capacitance

 

 

(C12) determines the frequency response of the

 

 

supply-voltage ripple rejection

26

VS

Supply voltage input

 

 

27

AFout

Audio amplifier output

28

AF-GND

Ground of the audio power stage

2 (15)

Rev. A3, 23-Feb-01

 

 

 

 

 

 

U2510B

 

Terminal Voltages

 

 

 

 

 

 

 

 

Test circuit: Vin = 0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Voltage/V

 

 

 

Pin

 

Symbol

 

VS = 3 V

 

 

VS = 6 V

 

 

 

 

 

 

 

 

 

 

 

 

 

AM

FM

TAPE

AM

FM

TAPE

 

1

Mute voltage (R3 = 0)

V1

±

1.6

±

±

1.6

±

 

2

FM discriminator

V2

±

1.0

±

±

1.0

±

 

3

Negative feedback

V3

1.2

1.2

1.2

2.6

2.6

2.6

 

4

Volume control input (S4 = A)

V4

2.4

2.4

2.4

2.4

2.4

2.4

 

5

AM oscillator

V5

2.4

±

±

2.4

±

±

 

6

FM AFC

V6

±

1.9

±

±

1.9

±

 

7

FM oscillator

V7

±

2.4

±

±

2.4

±

 

8

VRef

V8

2.4

2.4

2.4

2.4

2.4

2.4

 

9

FM RF tank

V9

±

2.4

2.4

±

2.4

±

 

10

AM input

V10

2.4

±

±

±

2.4

±

 

11

FM AGC

V11

±

0

±

±

0

±

 

12

FM input

V12

 

1.4

±

±

1.4

±

 

13

Front end ground

V13

±

±

±

±

±

±

 

14

AM/FM IF output

V14

2.9

2.7

±

5.9

5.7

±

 

15

Mode control switch

V15

0

±

2.9

0

±

5.7

 

16

AM IF input

V16

0

±

±

0

±

±

 

17

FM IF input

V17

±

0.7

±

±

0.7

±

 

18

Treble control input (S5 = A)

V18

2.4

2.4

2.4

2.4

2.4

2.4

 

19

LED

V19

 

 

 

 

 

 

 

20

IF ground

V20

0

0

0

0

0

0

 

21

AFC switch (S3 = off)

V21

1.2

1.2

1.2

1.2

1.2

1.2

 

22

AGC (AM)/AFC (FM)

V22

1.5

1.2

±

1.5

1.2

±

 

23

Detector output

V23

1.5

1.2

±

1.5

1.2

±

 

24

AF input

V24

1.5

1.5

1.5

1.5

1.5

1.5

 

25

Ripple filter

V25

2.7

2.7

2.7

5.3

5.3

5.3

 

26

Supply voltage

V26

3.0

3.0

3.0

6.0

6.0

6.0

 

27

AF output

V27

1.2

1.2

1.2

2.6

2.6

2.6

 

28

AF ground

V28

0

0

0

0

0

0

 

Rev. A3, 23-Feb-01

3 (15)

U2510B

Absolute Maximum Ratings

Parameters

Symbol

Value

Unit

Supply voltage

VS

13

V

Power dissipation

Ptot

900

mW

Ambient temperature range

Tamb

±20 to +75

°C

Electrical Characteristics

VS = 6 V, Tamb = 25°C, test circuit (figure 16), unless otherwise specified

Parameters

Test Conditions / Pins

Symbol

Min.

Typ.

Max.

Unit

Supply voltage range

 

 

VS

2.5

 

9 *

V

Oscillator stop voltage

 

 

VS

2.2

 

 

V

Operating temperature range

 

 

T

±20

 

+75

°C

Supply quiescent current

Vi1 = Vi2 = V4 = 0;

 

 

 

 

 

 

AM

(S2 = AM)

IS

 

4.0

 

mA

 

FM

(S2 = FM)

IS

 

6.5

 

mA

 

TAPE (S2 = Tape)

IS

 

2.2

 

mA

Regulated voltage

 

Pin 8

VRef

 

2.4

 

V

Audio amplifier Vi3 (Pin 24), test point: Vo (Pin 27) f = 1 kHz

 

 

 

 

 

AF measuring range: 30 Hz to 20 kHz, S2 = Tape, S4 = A, S5 = A

 

 

 

 

Input resistance

 

Pin 24

Rj

 

100

 

k

Closed loop voltage gain

GVaf1 = 20 log (Vo/Vi3)

 

 

 

 

 

 

Vi3 = 10 mV

GVaf1

 

40

 

dB

Output voltage

Vi3 = 100 mV, S4 = B

Vo

 

0.7

3

mV

High±end cut-off frequency

fc (±3 dB)

fc

 

13

 

kHz

 

S5 = B

 

fc

 

0.8

 

kHz

Supply-voltage rejection ratio

SVRR = 20 log (Vhum/Vo)

 

 

 

 

 

 

Vhum = 200 mV,

 

 

 

 

 

 

fhum = 200 Hz, S4 = B

SVRR

 

32

 

dB

Noise voltage

S4 = B, Vi3 = 0

Vn

 

300

1000

V

AF output power

THD = 10 %, RL = 8

 

 

 

 

 

 

VS = 4.5 V

Po

 

225

 

mW

 

VS = 6.0 V

Po

400

420

 

mW

 

VS = 9.0 V

Po

 

1000

 

mW

Distortion

Po = 50 mW, RL = 8

d

 

0.6

 

%

FM section, Vi2 = 60 dB V, fi2 = 98 MHz, fm = 1 kHz, dev. = 22.5 kHz, fiIF = 10.7 MHz,

 

 

AF measuring range: 300 Hz to 20 kHz, S2 = FM, S1 = A, S6 = B, test point: VD (Pin 23)

 

 

FM front-end voltage gain

GVFM = 20 log (ViIF / Vi2)

 

 

 

 

 

 

S1 = B, Vi2 = 40 db V

GVFM

 

30

 

dB

Recovered audio voltage

 

Pin 23

VD af

 

85

 

mV

Detector output resistance

 

Pin 23

RDo

 

7.5

 

k

Detector output distortion

dev. = 75 kHz

 

 

 

 

 

 

Vi2 = 60 dB V

THD

 

0.5

 

%

 

Vi2 = 105 dB V

THD

 

0.8

 

%

*U2510B-M__T: max. 6 V

4 (15)

Rev. A3, 23-Feb-01

U2510B

Electrical Characteristics (continued)

VS = 6 V, Tamb = 25°C, test circuit (figure 16), unless otherwise specified

Parameters

Test Conditions / Pins

Symbol Min.

Typ.

Max.

Unit

AM rejection ratio

m = 30%

 

AMRR

25

 

dB

RF sensitivity

(S+N)/N = 26 dB

 

Vi2

9

 

dB V

 

(S+N)/N = 46 dB

 

Vi2

22

 

dB V

Limiting threshold (-3 dB)

 

 

Vi2

3

 

dB V

Mute voltage

Test point: Mute

 

 

 

 

 

 

Vi2 = 0

 

Vmute

1.8

 

V

 

Vi2 = 60 dB V

 

Vmute

0.4

 

V

Mute depth

Referred to V0 at Vi2 = 0

 

 

 

 

 

S6 = A

 

MD

26

 

dB

 

S6 = C

 

MD

20

 

dB

AFC holding range

fOSC > fin, S3 = A, S6 = A

 

 

 

 

 

Vi2 10 dB V

 

FHR

no AFC

 

 

 

Vi2 = 20 dB V

 

FHR

180

 

kHz

 

Vi2 = 80 dB V

 

FHR

220

 

kHz

LED current

 

 

ILED

5.5

 

mA

Oscillator voltage

eZload = 2.5 k

Pin 7

VOSC

180

 

mV

AM section Vi1 = 60 dB V, fi1 = 1.6 MHz, fm = 1 kHz, m = 30%, fiIF = 455 kHz,

 

 

 

AF measuring range: 300 Hz to 20 kHz, (S2 = AM, S1 = B, test point: VD)

 

 

 

AM front end voltage gain

GVAM = 20 log (ViIF/Vi1)

GVAM

25

 

dB

 

Vi1 = 20 dB V, S1 = A

 

 

 

 

Recovered audio voltage

 

 

VD af1

70

 

mV

Detector output resistance

 

Pin 23

RDo

7.5

 

k

Detector output distortion

Vi1 = 60 dB V

 

THD

1

 

%

 

Vi1 = 105 dB V

 

THD

3

 

%

RF sensitivity

(S+N)/N= 10 dB

 

Vi1

0

 

dB V

 

(S+N)/N= 26 dB

 

Vi1

16

 

dB V

 

(S+N)/N= 46 dB

 

Vi1

35

 

dB V

AGC figure of merit referred

Vi1 = 105 dB V, voltage

 

 

 

 

to VD af

drop (VD af) = ±10 dB

FOM

100

 

dB

IF input resistance

 

Pin 16

Zi

3.1

 

k

LED current

 

 

ILED

5.5

 

mA

Oscillator voltage

 

Pin 5

VOSC

160

 

mV

Rev. A3, 23-Feb-01

5 (15)

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