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

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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

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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

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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

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