ATMEL U2510B-M Datasheet

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

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

U2510B

 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

Block Diagram

FM osc.

tank

87 6

AFC

front end

RFAGC

AM/FM

and

IF BPE

14 16

AFC

control

AM IF

amp. and

detect.

AGC

21 13 20 19 1

FM ant.

FM RF

BPE

AGC

ant.

AM osc.

tank

Ref

FM RF

tank

AGC

Voltage stab. mode control

 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

(Replaceable)

FM IF

amp.

Level indic.

226

discr.

22 18

Power

amp.

AF preamp.

Volume

Mute HCC

25 23

Tape

AFC mode

Figure 1. Block diagram

LED

Treble Vol

13912

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

FM-discr

Vol ctrl in

AMOsc

FM-AFC

FMOsc

FMtank

AMtank

FM-AGC

FMin

FE-GND

AM/FM

IFout

Ref

14812

Figure 2. Pinning

Pin Symbol Function

1 Mute Mute voltage output, time constant (C23),

2 FM-discr FM discriminator filter connection, ceramic

3 CF Audio negative feedback input. Blocking

4 Vol ctrl in Input for volume control voltage

mute depth and threshold adjustable by load resistance (R3)

resonator or equivalent LC-circuit

capacitor (C8) determines the audio amplifiers low-end cut-off frequency

AF-GND

AFout

Ripple in

AFin

AM/FM detect

AGC/AFC

AFC switch

IF-GND

LED drive

Treble in

FM-IFin

AM-IFin

Mode ctrl switch

Pin Symbol Function

5 AMOsc AM oscillator tank circuit input, recommended

6 FM–AFC AFC diode connection, coupling capacitor

7 FMOsc FM oscillator tank circuit input, recommended

8 V 9 FMtank FM RF tank circuit connection, recommended

10 AMtank AM RF tank circuit connection, recommended

11 FM-AGC FM AGC voltage output, time constant (C20).

12 FMin FM RF input (common-base preamplifier

13 FE-GND FM front-end ground 14 AM/FM

15 Mode ctrl

16 AM-IFin AM IF input, input impedance = 3.1 k 17 FM-IFin FM IF input, input impedance = 330  18 V 19 LED drive Level indicator output

20 IF-GND IF ground 21 AFC switch AFC function control input:

22 V

23 AM/FM

24 AFin Audio amplifier input, input resistance

25 Ripple in Ripple filter connection. Load capacitance

26 V 27 AFout Audio amplifier output 28 AF-GND Ground of the audio power stage

IFout

switch

Treble in

AGC/AFC

detect

load impedance approximately 2.5 k

(C19) determines the AFC characteristic (holding range and slope)

load impedance approximately 3 k Regulated voltage output (2.4 V)

Ref

load impedance approximately 3 k

load impedance approximately 20 k

Loading this pin by a resistor (to GND) will increase the FM AGC threshold, grounding this pin will switch off the FM AGC function

transistor), recommended (RF) source impedance approximately 100 

AM/FM IF output (collector output of the IF preamplifier)

Mode control input:

Pin | Function open | F M Ground | AM VS (R4 = 10 k) | Tape

Treble control voltage input

(open-collector output, LED drive)

Pin | Function open | AFC off Ground | f V

AGC/AFC voltage, time constant adjust (C10), input impedance approximately 42 k

AM/FM detector output, the load capacitor (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

approximately 100 k coupling capacitor (C9) determines the low frequency response

(C12) determines the frequency response of the supply-voltage ripple rejection

Supply voltage input

| f

OSC OSC

> f

< f

Rev. A3, 23-Feb-012 (15)

Terminal Voltages

Test circuit: Vin = 0

Pin Symbol

1 Mute voltage (R3 = 0) V 2 FM discriminator V 3 Negative feedback V 4 Volume control input (S4 = A) V 5 AM oscillator V 6 FM AFC V 7 FM oscillator V 8 V

Ref

9 FM RF tank V 10 AM input V 11 FM AGC V 12 FM input V 13 Front end ground V 14 AM/FM IF output V 15 Mode control switch V 16 AM IF input V 17 FM IF input V 18 Treble control input (S5 = A) V 19 LED V 20 IF ground V 21 AFC switch (S3 = off) V 22 AGC (AM)/AFC (FM) V 23 Detector output V 24 AF input V 25 Ripple filter V 26 Supply voltage V 27 AF output V 28 AF ground V

U2510B

Voltage/V

VS = 3 V VS = 6 V

AM FM TAPE AM FM TAPE

1 2 3 4 5 6 7

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

– 1.6 – – 1.6 – – 1.0 – – 1.0 –

1.2 1.2 1.2 2.6 2.6 2.6

2.4 2.4 2.4 2.4 2.4 2.4

2.4 – – 2.4 – – – 1.9 – – 1.9 – – 2.4 – – 2.4 –

2.4 2.4 2.4 2.4 2.4 2.4 – 2.4 2.4 – 2.4 –

2.4 – – – 2.4 – – 0 – – 0 –

1.4 – – 1.4 –

– – – – – –

2.9 2.7 – 5.9 5.7 – 0 – 2.9 0 – 5.7 0 – – 0 – – – 0.7 – – 0.7 –

2.4 2.4 2.4 2.4 2.4 2.4

0 0 0 0 0 0

1.2 1.2 1.2 1.2 1.2 1.2

1.5 1.2 – 1.5 1.2 –

1.5 1.5 1.5 1.5 1.5 1.5

2.7 2.7 2.7 5.3 5.3 5.3

3.0 3.0 3.0 6.0 6.0 6.0

1.2 1.2 1.2 2.6 2.6 2.6 0 0 0 0 0 0

Rev. A3, 23-Feb-01 3 (15)

U2510B

Absolute Maximum Ratings

Parameters Symbol Value Unit Supply voltage V Power dissipation P Ambient temperature range T

Electrical Characteristics

tot

amb

13 V

900 mW

–20 to +75 °C

VS = 6 V, T

= 25°C, test circuit (figure 16), unless otherwise specified

amb

Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit Supply voltage range V Oscillator stop voltage V

S S

2.5 9 * V

2.2 V

Operating temperature range T –20 +75 °C Supply quiescent current Vi1 = Vi2 = V4 = 0;

AM (S2 = AM) FM (S2 = FM) TAPE (S2 = Tape)

Regulated voltage Pin 8 V

I I I

Ref

S S S

4.0

6.5

2.2

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 R Closed loop voltage gain GV

= 20 log (Vo/Vi3)

af1

Vi3 = 10 mV GV Output voltage Vi3 = 100 mV, S4 = B V High–end cut-off frequency fc (–3 dB)

S5 = B Supply-voltage rejection ratio SVRR = 20 log (V

= 200 mV,

hum

= 200 Hz, S4 = B SVRR 32 dB

hum

hum/Vo

)

Noise voltage S4 = B, Vi3 = 0 V

af1 o

100 k

40 dB

0.7 3 mV 13

0.8

kHz kHz

300 1000 V

AF output power THD = 10 %, RL = 8 

VS = 4.5 V VS = 6.0 V VS = 9.0 V

400

225 420

1000

mW mW 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, f

= 10.7 MHz,

iIF

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 (V

S1 = B, Vi2 = 40 dbV GV Recovered audio voltage Pin 23 VD Detector output resistance Pin 23 R

iIF

/ Vi2)

30 dB

85 mV

7.5 k

Detector output distortion dev. =  75 kHz

Vi2 = 60 dBV

Vi2 = 105 dBV

THD THD

0.5

0.8

* U2510B-M__T: max. 6 V

mA mA mA

% %

Rev. A3, 23-Feb-014 (15)

Electrical Characteristics (continued)

U2510B

VS = 6 V, T

= 25°C, test circuit (figure 16), unless otherwise specified

amb

Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit AM rejection ratio m = 30% AM RF sensitivity (S+N)/N = 26 dB

(S+N)/N = 46 dB

Limiting threshold (-3 dB) V

i2 i2

Mute voltage Test point: Mute

Vi2 = 0 Vi2 = 60 dBV

V V

mute mute

Mute depth Referred to V0 at Vi2 = 0

S6 = A S6 = C

AFC holding range f

> fin, S3 = A, S6 = A

OSC

 10 dBV

Vi2 = 20 dBV

Vi2 = 80 dBV LED current I Oscillator voltage eZ

= 2.5 k Pin 7 V

load

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

MD MD

FHR FHR FHR

LED

OSC

= 455 kHz,

iIF

AF measuring range: 300 Hz to 20 kHz, (S2 = AM, S1 = B, test point: VD) AM front end voltage gain GVAM = 20 log (V

iIF/Vi1

)

Vi1 = 20 dBV, S1 = A Recovered audio voltage V Detector output resistance Pin 23 R Detector output distortion Vi1 = 60 dBV

Vi1 = 105 dBV RF sensitivity (S+N)/N= 10 dB

(S+N)/N= 26 dB

(S+N)/N= 46 dB AGC figure of merit referred

to V

D af

Vi1 = 105 dBV, voltage

drop (V

) = –10 dB FOM 100 dB

D af

IF input resistance Pin 16 Z LED current I Oscillator voltage Pin 5 V

D af1

THD THD

LED

OSC

25 dB

3 dBV

1.8

0.4

26 20

no AFC

 180  220

5.5 mA

180 mV

25 dB

70 mV

7.5 k 1

3 0

16 35

3.1 k

5.5 mA

160 mV

dBV dBV

V V

dB dB

kHz kHz

% %

dBV dBV dBV

Rev. A3, 23-Feb-01 5 (15)

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