ST TS2012FC User Manual

TS2012FC

Filter-free flip-chip stereo 2 x 2.5 W class D audio power amplifer

Features

■Operates from VCC = 2.5 to 5.5 V

■Dedicated standby mode active low for each channel

■Output power per channel: 1.15 W at 5 V or 0.63 W at 3.6 V into 8 Ω with 1% THD+N max.

■Output power per channel: 1.85 W at 5 V into 4 Ω with 1% THD+N max.

■Output short-circuit protection

■Four gain setting steps: 6, 12, 18, 24 dB

■Low current consumption

■PSSR: 63 dB typ at 217 Hz.

■Fast startup phase: 7.8 ms

■Thermal shutdown protection

■Flip-chip 16-bump lead-free package

Applications

■Cellular phones

■PDA

Description

The TS2012 is a fully-differential stereo class D power amplifier able to drive up to 1.15 W into an 8 Ω load at 5 V per channel. It achieves better efficiency compared to typical class AB audio amps.

The device has four different gain settings utilizing two digital pins: G0 and G1.

Pop and click reduction circuitry provides low on/off switch noise while allowing the device to start within 8 ms.

Two standby pins (active low) allow each channel to be switched off separately.

The TS2012 is available in a flip-chip 16-bump lead-free package.

	Flip chip 16 bumps
Pin connections (top view)
LOUT-	STDBYL	PGND	ROUT-
LOUT+	STDBYR	AGND	ROUT+
PVCC	G1	G0	AVCC
INL+LIN+	LIN-	RIN-	RIN+

March 2009

Rev 4

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www.st.com

Contents	TS2012FC

Contents

1	Absolute maximum ratings and operating conditions . . . . . . . . . . . .		. 3
2	Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 5
3	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		7
	3.1	Electrical characteristics tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
	3.2	Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
4	Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		21

4.1 Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.2 Gain settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.3 Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.4 Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.5 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.6 Wake-up time (tWU) and shutdown time (tSTBY) . . . . . . . . . . . . . . . . . . . . 23 4.7 Consumption in shutdown mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.8 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.9 Output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.10 Short-circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.11 Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5	Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	28
6	Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	31
7	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	32

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TS2012FC	Absolute maximum ratings and operating conditions

1 Absolute maximum ratings and operating conditions

	Table 1.		Absolute maximum ratings
	Symbol		Parameter	Value	Unit
	VCC		Supply voltage (1)	6	V
	V	in	Input voltage (2)	GND to V	V
				CC
	Toper		Operating free air temperature range	-40 to + 85	°C
	Tstg		Storage temperature	-65 to +150	°C
	Tj		Maximum junction temperature	150	°C
	R		Thermal resistance junction to ambient (3)	200	°C/W
	thja
	Pd		Power dissipation	Internally limited(4)
	ESD		HBM: human body model(5)	2	kV
			MM: machine model(6)	200	V
	Latch-up		Latch-up immunity	200	mA
	VSTBY		Standby pin maximum voltage	GND to VCC	V
			Lead temperature (soldering, 10sec)	260	°C
			Output short circuit protection(7)

1.All voltage values are measured with respect to the ground pin.

2.The magnitude of the input signal must never exceed VCC + 0.3 V / GND - 0.3 V.

3.The device is protected in case of over temperature by a thermal shutdown active at 150°C.

4.Exceeding the power derating curves during a long period will cause abnormal operation.

5.Human body model: 100 pF discharged through a 1.5 kΩ resistor between two pins of the device, done for all couples of pin combinations with other pins floating.

6.Machine model: a 200 pF cap is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 Ω), done for all couples of pin combinations with other pins floating.

7.Implemented short-circuit protection protects the amplifier against damage by short-circuit between positive and negative outputs of each channel and between outputs and ground.

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Absolute maximum ratings and operating conditions						TS2012FC
	Table 2.	Operating conditions
	Symbol	Parameter	Value				Unit
	VCC	Supply voltage	2.5 to 5.5				V
	Vin	Input voltage range	GND to VCC				V
	Vic	Input common mode voltage(1)	GND+0.5V to VCC-0.9V				V
		Standby voltage input (2)
	VSTBY	Device ON	1.4 ≤ V	≤ V		CC	V
		Device in STANDBY(3)	STBY
			GND ≤ VSTBY ≤		0.4
	RL	Load resistor	≥ 4				Ω
	VIH	GO, G1 - high level input voltage(4)	1.4 ≤ VIH ≤ VCC				V
	VIL	GO, G1 - low level input voltage	GND ≤ VIL ≤ 0.4				V
	Rthja	Thermal resistance junction to ambient (5)	90				°C/W

1.I Voo I ≤ 40 mV max with all differential gains except 24 dB. For 24 dB gain, input decoupling capacitors are mandatory.

2.Without any signal on standby pin, the device is in standby (internal 300 kΩ +/-20% pull-down resistor).

3.Minimum current consumption is obtained when VSTBY = GND.

4.Between G0, G1pins and GND, there is an internal 300 kΩ (+/-20%) pull-down resistor. When pins are floating, the gain is 6 dB. In full standby (left and right channels OFF), these resistors are disconnected (HiZ input).

5.With a 4-layer PCB.

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TS2012FC	Typical application

2 Typical application

Figure 1. Typical application schematics

				Cs2	VCC	Cs1
				0.1uF		1uF
		Gain Select
		Control
	Input capacitors
	are optional
Differential		TS2012	D2		A2
Left Input
Left IN+			AVCC		PVCC
	Cin
	A1	Lin+			H	Lout+	A3
	Cin		Gain	PWM
			Select
Left IN-	B1	Lin-			Bridge	Lout-	A4
	C2	G0
				Oscillator
	B2	G1
Differential
Right Input	D1	Rin+				Rout+	D3
Right IN+					H
			Gain
	Cin			PWM
			Select
	C1	Rin-			Bridge	Rout-	D4
	Cin
Right IN-	B4	STBYL
			Standby	Protection
	B3	STBYR	Control	Circuit
			AGND		PGND
			C3		C4

Left speaker

Right speaker

		Standby Control
				Cs2	VCC	Cs1
				0.1uF		1uF
		Gain Select
		Control
	Input capacitors
	are optional
Differential		TS2012		D2	A2
Left Input
Left IN+				AVCC	PVCC
	Cin
	A1	Lin+			H	Lout+	A3
	Cin		Gain	PWM			LC Output Filter	Load
			Select
Left IN-	B1	Lin-			Bridge	Lout-	A4
	C2	G0
				Oscillator
	B2	G1
Differential
Right Input	D1	Rin+				Rout+	D3
Right IN+					H
			Gain
	Cin			PWM			LC Output Filter	Load
			Select
	C1	Rin-			Bridge	Rout-	D4
	Cin
Right IN-	B4	STBYL
			Standby	Protection
	B3	STBYR	Control	Circuit
				AGND	PGND
				C3	C4

4Ω LC Output Filter	8Ω LC Output Filter
Standby Control	30μH
15μH
2μ F	1μ F
2μ F	1μ F
15μH	30μH

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Typical application				TS2012FC
	Table 3.	External component descriptions
	Components			Functional description
	CS1, CS2		Supply capacitor that provides power supply filtering.
			Input coupling capacitors (optional) that block the DC voltage at the amplifier input
	Cin		terminal. The capacitors also form a high pass filter with Zin
			(Fcl = 1 / (2 x π x Zin x Cin)). Be aware that value of Zin is changing with gain setting.
	Table 4.	Pin descriptions
	Pin number		Pin name	Pin description
	A1		Lin+	Left channel positive differential input
	A2		PVCC	Power supply voltage
	A3		Lout+	Left channel positive output
	A4		Lout-	Left channel negative output
	B1		Lin-	Left channel negative differential input
	B2		G1	Gain select pin (MSB)
	B3		STBYR	Standby pin (active low) for right channel output
	B4		STBYL	Standby pin (active low) for left channel output
	C1		Rin-	Right channel negative differential input
	C2		G0	Gain select pin (LSB)
	C3		AGND	Analog ground
	C4		PGND	Power ground
	D1		Rin+	Right channel positive differential input
	D2		AVCC	Analog supply voltage
	D3		Rout+	Right channel positive output
	D4		Rout-	Right channel negative output

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TS2012FC	Electrical characteristics

3 Electrical characteristics

3.1Electrical characteristics tables

	Table 5.	VCC = +5 V, GND = 0 V, Vic = 2.5 V, Tamb = 25° C
		(unless otherwise specified)
	Symbol	Parameters and test conditions	Min.	Typ.	Max.	Unit
	ICC	Supply current		5	7	mA
		No input signal, no load, both channels
	ISTBY	Standby current		1	2	µA
		No input signal, VSTBY = GND
	Voo	Output offset voltage			25	mV
		Floating inputs, G = 6 dB, RL = 8 Ω
		Output power
	Po	THD + N = 1% max, f = 1 kHz, RL = 4 Ω		1.85		W
		THD + N = 1% max, f = 1 kHz, RL = 8 Ω		1.15
		THD + N = 10% max, f = 1 kHz, RL = 4 Ω		2.5
		THD + N = 10% max, f = 1 kHz, RL = 8 Ω		1.6
	THD + N	Total harmonic distortion + noise		0.5		%
		Po = 0.8 W, G = 6 dB, f =1 kHz, RL = 8 Ω
		Efficiency per channel
	Efficiency	Po = 1.85 W, RL = 4 Ω + 15 µH		78		%
		Po = 1.16 W, RL = 8 Ω + 15 µH		88
		Power supply rejection ratio with inputs grounded
	PSRR	Cin = 1 µF (1),f = 217 Hz, RL = 8 Ω, Gain = 6 dB,		65		dB
		Vripple = 200 mVpp
	Crosstalk	Channel separation		90		dB
		Po = 0.9 W, G = 6 dB, f =1 kHz, RL = 8 Ω
		Common mode rejection ratio
	CMRR	Cin = 1 µF, f = 217 Hz, RL = 8 Ω, Gain = 6 dB,		63		dB
		VICM = 200 mVpp
		Gain value with no load
	Gain	G1 = G0 = VIL	5.5	6	6.5	dB
		G1 = VIL and G0 = VIH	11.5	12	12.5
		G1 = VIH and G0 = VIL	17.5	18	18.5
		G1 = G0 = VIH	23.5	24	24.5
		Single-ended input impedance
		Referred to ground
	Zin	Gain = 6 dB	24	30	36	kΩ
		Gain = 12 dB	24	30	36
		Gain = 18 dB	12	15	18
		Gain = 24 dB	6	7.5	9
	FPWM	Pulse width modulator base frequency	190	280	370	kHz

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Electrical characteristics					TS2012FC
Table 5.	VCC = +5 V, GND = 0 V, Vic = 2.5 V, Tamb = 25° C
	(unless otherwise specified) (continued)
Symbol	Parameters and test conditions	Min.	Typ.	Max.		Unit
SNR	Signal to noise ratio (A-weighting)		99			dB
	Po = 1.1 W, G = 6 dB, RL = 8 Ω
tWU	Total wake-up time(2)	9	13	16.5		ms
tSTBY	Standby time(2)	11	15.8	20		ms
	Output voltage noise f = 20 Hz to 20 kHz, RL = 8 Ω
	Unweighted (filterless, G = 6 dB)		61
	A-weighted (filterless, G = 6 dB)		31
VN	Unweighted (with LC output filter, G = 6 dB)		59			µVRMS
	A-weighted (with LC output filter, G = 6 dB)		31
	Unweighted (filterless, G = 24 dB)		87
	A-weighted (filterless, G = 24 dB)		52
	Unweighted (with LC output filter, G = 24 dB)		87
	A-weighted (with LC output filter, G = 24 dB)		53

1.Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinus signal to VCC at f = 217 Hz.

2.See Section 4.6: Wake-up time (tWU) and shutdown time (tSTBY) on page 23.

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	TS2012FC			Electrical characteristics
	Table 6.	VCC = +3.6 V, GND = 0 V, Vic = 1.8V , Tamb = 25° C
		(unless otherwise specified)
	Symbol	Parameter	Min.	Typ.	Max.	Unit
	ICC	Supply current		3.5	5.5	mA
		No input signal, no load, both channels
	ISTBY	Standby current		0.7	2	µA
		No input signal, VSTBY = GND
	Voo	Output offset voltage			25	mV
		Floating inputs, G = 6 dB, RL = 8 Ω
		Output power
	Po	THD + N = 1% max, f = 1 kHz, RL = 4 Ω		0.96		W
		THD + N = 1% max, f = 1 kHz, RL = 8 Ω		0.63
		THD + N = 10% max, f = 1 kHz, RL = 4 Ω		1.3
		THD + N = 10% max, f = 1 kHz, RL = 8 Ω		0.8
	THD + N	Total harmonic distortion + noise		0.35		%
		Po = 0.45 W, G = 6 dB, f = 1 kHz, RL = 8 Ω
		Efficiency per channel
	Efficiency	Po = 0.96 W, RL = 4 Ω + 15 µH		78		%
		Po = 0.63 W, RL = 8 Ω + 15 µH		88
		Power supply rejection ratio with inputs grounded
	PSRR	Cin = 1 µF (1),f = 217 Hz, RL = 8 Ω, Gain = 6 dB,		65		dB
		Vripple = 200 mVpp
	Crosstalk	Channel separation		90
		G = 6 dB, f = 1 kHz, RL = 8 Ω
		Common mode rejection ratio
	CMRR	Cin = 1 µF, f = 217 Hz, RL = 8 Ω, Gain = 6 dB,		62		dB
		VICM = 200 mVpp
		Gain value with no load
	Gain	G1 = G0 = VIL	5.5	6	6.5	dB
		G1 = VIL and G0 = VIH	11.5	12	12.5
		G1 = VIH and G0 = VIL	17.5	18	18.5
		G1 = G0 = VIH	23.5	24	24.5
		Single-ended input impedance
		Referred to ground
	Zin	Gain = 6 dB	24	30	36	kΩ
		Gain = 12 dB	24	30	36
		Gain = 18 dB	12	15	18
		Gain = 24 dB	6	7.5	9
	FPWM	Pulse width modulator base frequency	190	280	370	kHz
	SNR	Signal-to-noise ratio (A-weighting)		96		dB
		Po = 0.6 W, G = 6 dB, RL = 8 Ω
	tWU	Total wake-up time(2)	7.5	11.3	15	ms
	tSTBY	Standby time(2)	10	13.8	18	ms

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Electrical characteristics					TS2012FC
Table 6.	VCC = +3.6 V, GND = 0 V, Vic = 1.8V , Tamb = 25° C
	(unless otherwise specified) (continued)
Symbol	Parameter	Min.	Typ.	Max.		Unit
	Output voltage noise f = 20 Hz to 20 kHz, RL = 8 Ω
	Unweighted (filterless, G = 6 dB)		54
	A-weighted (filterless, G = 6 dB)		28
VN	Unweighted (with LC output filter, G = 6 dB)		52			µVRMS
	A-weighted (with LC output filter, G = 6 dB)		27
	Unweighted (filterless, G = 24 dB)		80
	A-weighted (filterless, G = 24 dB)		50
	Unweighted (with LC output filter, G = 24 dB)		79
	A-weighted (with LC output filter, G = 24 dB)		49

1.Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinus signal to VCC at f = 217 Hz.

2.See Section 4.6: Wake-up time (tWU) and shutdown time (tSTBY) on page 23.

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