Samsung S1A0427B01-D0B0 Datasheet

AM/FM 1 CHIP RADIO

S1A0427B01

INTRODUCTION

16−DlP−300A

The S1A0427B01 is a monolithic integrated circuit designed for portable AM/FM radios or AM/FM clock radios.

FUNCTIONS

• AM RF & MIX	• AM Local OSC
• AM AGC	• AM/FM IF AMP
• AM/FM DET	•	Audio Power AMP
• Regulator	•	FM AFC Control

FEATURE

•Portable AM/FM 1-chip radio

•Wide operating supply voltage range: VCC = 3V − 12V (Approximately ) (Depending on the internal regulator tolerance)

•Recommended operating suply voltage: VCC = 4.5V − 9V

	Vcc	4.5V	6.0V	7.5V	9.0V	Line Operated
RL
8Ω		O	O	O	X	X
16Ω		O	O	O	O	X
45Ω		O	O	O	O	O

•When using the AC line as an internal shunt regulator mode, it is possible to use a low cost application without a transformer (approximately 42mA)

•IF AMP gain is determined by the DC voltage appearing at IC Pin 16.

•Power output: PC = 0.28W (Min.) at THD = 10% (Vcc = 5.5V/8Ω).

ORDERING INFORMATION

Device	Package	Operating Temperature
S1A0427B01-D0B0	16−DlP−300A	20°C − +70°C

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S1A0427B01

AM/FM 1 CHIP RADIO

BLOCK DIAGRAM

AM IF	RF	AM/FM	IF	AFC AGC	AM/FM	IF DET	VCC
OUTPUT	GND	IF INPUT	BYPASS	BYPASS IF OUTPUT INPUT
4	3	2	1	16	15	14	13
			AM/FM				VOLTAGE
							REGULATOR
			IF			AM/FM
AM F/E
						DET
MIX
OSC	RF				POWER
					AMP
5	6	7	8	9	10	11	12

AM OSC AM RF	RF	AUDIO AUDIO RIPPLE	AUDIO AUDIO
INPUT	BYPASS	DET OUT POWER REJECTION	GND POWER OUT

ABSOLUTE MAXIMUM RATINGS (Ta = 25°C)

Character istic	Symbol	Value	Unit
Supply Voltage	VCC	13	V
Power Dissipation	PD	600	mW
Supply Current	ICC	44	mA
Thermal Resistance Junction to Ambient	REJA	100	°C/W
Operating Temperature	TOPR	−20 − +70	°C
Storage Temperature	TSTG	−55 − +150	°C

2

AM/FM 1 CHIP RADIO

S1A0427B01

ELECTRICAL CHARACTERISTICS

(Ta =25°C, VCC = 5.5V, fm = 1kHz, AM: f = 1MHz, 30% Mod, FM: f = 10.7MHz f = 22.5kHz, unless otherwise specified)

		Characteristic	Symbol	Test Conditions	Min.	Typ.	Max.	Unit
		Quiescent Circuit	ICCQ	SW: FM, Vcc = 3V	7	12	17	mA
		Current
				SW: FM, Vcc = 9V	10	17	23
	FM
		Pin 16 Terminal Voltage	V16(FM)	SW: FM, Vcc = 9V, VI = 0	2.0	2.4	3.1	V
		-3 dB Limiting Sensitivity	VI(LIM)	SW: FM, −3dB	−	57	−	dB
				V16 = 2.4V, V R Min
		Internal Regulated Vtg.	VCC	SW: AM, ICC = 42mA	12	13.2	14.0	V
		Pin 16 Voltage	V16 (AM)	SW: AM, VCC = 9V, VI = 0	1.4	−	1.9	V
	AM	Maximum Sensitivity	SMAX	SW: AM, VCC = 12V	1.5	3.0	−	V
				VI = 37dBμ, RL = 8Ω
		Signal to Noise Ratio	S/N	VI = 37.5dBμ, RL = 8Ω	15	20	−	dB
				PO = 50mW
		Output Power	PO	f = 1kHz, THD = 10%	0.28	−	−	W
				VR Min, RL = 8Ω
	PWR
		Total Harmonic		ICC = 42mA, RL = 45Ω
	AMP		THD		−	0.5	4.0	%
		Distortion		f = 1kHz, VO = 2V VR Min
		Voltage gain	GV	f = 1kHz, RL = 8Ω, PO = 50mW	−	41	−	dB

3

S1A0427B01

AM/FM 1 CHIP RADIO

TEST CIRCUIT

		V16
																			VCC
							T6
			C18			1		6
	C17	C16	470pF			2
	470μ F 0.047μ F					3		4
R8		T4
	4		3			3		4
1.2kΩ				R8															POWER
			2			2													OUTPUT
				4.7k	Ω
	6		1			1		6										C11
																			RL
							T5											470μ F
				C15															GND
				10pF								C13
															C11
												470μ F
FM	SW													C12	0.001μ F
														220μ F
AM
						16		15	14	13	12		11	10	9
															R6
										S1A0427B01					22kΩ
						1		2	3	4	5		6	7	8		VR
															C10
															0.022μ F	100kΩ
																0.01μ F
						T2				L1				L2
						1	6	C5	C6	1	6		4	3
						2			51pF	2		R3		2		R5
				R2				680pF				50Ω				(R =	8	)
				10kΩ		3	4			3	4		6	1	C8
															50pF
		2pF
						T3							C7		R4
						4	1						0.047μ F		50Ω
	R1			C3			2
	50Ω			220pF
						6	3
								C4											C19
							0.022μ F												3.3μ F
				C2						FM
				0.022μ F														AUDIO	AUDIO
		FM IF INPUT									AM	SW			AM RF INPUT
																		DET OUTPUT POWER INPUT

4

AM/FM 1 CHIP RADIO

S1A0427B01

APPLICATION INFORMATION

—EXTERNAL COMPONENTS

	Part	Purpose	Typical	Influence
	Number
				Smaller Than Typ	Greater Than Typ
	R5	Am gain Control	47kΩ	Low AM gain	AGC Distortion increase,
			(33K − ∞ )		High gain
	R7	FM detector	4.7kΩ	Low detector output, stable IF gain,	Sharp IF AMP curve
		damper		low FM gain
	R8	FM gain adjust	470Ω	Low FM gain	High gain, but noise
					increase
	C2	IF bypass	0.022μF	Should not be less than 0.005μF	High IF Gain,
					S/N ratio degrade
	C4	IF filter	0.022μF	Removal may cause IF oscillation	No influence
					Using over 1 will cause
	C7	AM bypass	0.047μF	Low gain	FM distortion at small
					signal
	C9	Detector filter	0.01μF	Unstable IF AMP oscillation	Poor FM frequency
					response
	C10	Audio coupling	0.022μF	Lower sensitivity, poor low frequency	Bass boost affects
				response	de-emphasis curve
	C11	Audio Input High-	0.001μF	Audio oscillation	Poor response
		cut
	C12	Ripple filter	220μF	Poor frequency response & Low gain	Improve AC Hum
	C13	Audio output	470μF	Poor low frequency response	Can achieve optimum
		coupling			output power
	C14	Power line filter	470μF	Poor AC Hum	Improve AC Hum
	C15	FM detector	10pF	Narrow IF bandwidth	Wide IF bandwidth
		phase-shift
	C16	High freq.	0.047μF	Removal will cause fm oscillation	No influence
		(IF) bypass
		AN AGC time
	C17	constant and high	0.047μF	Charging not recommended	−
		frequency (IF)
		bypass

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