ST LS204 User Manual

LS204

High performance dual operational amplifier

Features

■Low power consumption

■Short-circuit protection

■Low distortion, low noise

■High gain-bandwidth product

■High channel separation

Description

The LS204 is a high performance dual operational amplifier with frequency and phase compensation built into the chip. The internal phase compensation allows stable operation as voltage follower in spite of its high gain-bandwidth product.

The circuit presents very stable electrical characteristics over the entire supply voltage range, and is particularly intended for professional and telecom applications (such as active filtering).

N

DIP8

(Plastic package)

D

SO-8

(Plastic micro package)

Pin connections

(top view)

Output 1	1			8	VCC+
Inverting input 1	2	-		7	Output 2
Non-inverting input 1	3	+	-	6	Inverting input 2
VCC -	4		+	5	Non-inverting input 2

June 2008

Rev 2

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www.st.com

Circuit schematics	LS204

1 Circuit schematics

Figure 1. Schematic diagram (1/2 LS204)

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LS204	Absolute maximum ratings and operating conditions

2 Absolute maximum ratings and operating conditions

Table 1.	Absolute maximum ratings
Symbol		Parameter	Value	Unit
VCC		Supply voltage(1)	±18	V
Vi		Input voltage(2)	±VCC	V
Vid		Differential input voltage(3)	±(VCC-1)	V
		Thermal resistance junction to ambient(4)
Rthja		SO-8	125	°C/W
		DIP8	85
		Thermal resistance junction to case(4)
Rthjc		SO-8	40	°C/W
		DIP8	41
		Output short-circuit duration(5)	Infinite
Tj		Junction temperature	150	°C
Tstg		Storage temperature range	-65 to +150	°C
		HBM: human body model(6)	2	kV
ESD		MM: machine model(7)	200	V
		CDM: charged device model(8)	1.5	kV

1.All voltage values, except differential voltage, are with respect to the zero reference level (ground) of the supply voltages where the zero reference level is the midpoint between VCC+ and VCC-.

2.The magnitude of the input voltage must never exceed the magnitude of the supply voltage or 15 volts, whichever is less.

3.Differential voltages are the non-inverting input terminal with respect to the inverting input terminal.

4.Short-circuits can cause excessive heating and destructive dissipation. Values are typical.

5.The output may be shorted to ground or to either supply. Temperature and/or supply voltages must be limited to ensure that the dissipation rating is not exceeded.

6.Human body model: A 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating.

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

8.Charged device model: all pins and the package are charged together to the specified voltage and then discharged directly to the ground through only one pin. This is done for all pins.

Table 2.	Operating conditions
Symbol	Parameter	LS204C		LS204I	Unit
VCC	Supply voltage		6 to 30		V
Vicm	Common mode input voltage range	VDD+1.5 to VCC-1.5			V
Toper	Operating free-air temperature range	0 to +70		-40 to +105	°C

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Electrical characteristics	LS204

3 Electrical characteristics

Table 3. Electrical characteristics at VCC = ±15 V, Tamb = +25° C (unless otherwise specified)

	Symbol	Parameter		LS204I					LS204C				Unit
			Min.		Typ.	Max.		Min.		Typ.	Max.
	ICC	Supply current			0.7		1.2			0.8		1.5	mA
	Iib	Input bias current			50		150			100		300	nA
		Tmin < Tamb < Tmax					300					700
	Ri	Input resistance (F = 1kHz)			1					1			MΩ
	Vio	Input offset voltage (Rs ≤ 10kΩ)			0.5		2.5			0.5		3.5	mV
		Tmin < Tamb < Tmax					3.5					5
	DVio	Input offset voltage drift (Rs ≤ 10kΩ) Tmin < Tamb < Tmax			5					5			µV/°C
	Iio	Input offset current			5		20			12		50	nA
		Tmin < Tamb < Tmax					40					100
	DIio	Input offset current drift Tmin < Tamb < Tmax			0.08					0.1			nA/°C
	Ios	Output short-circuit current			23					23			mA
	Avd	Large signal voltage gain Tmin < Tamb < Tmax
		RL = 2kΩ, VCC = ±15V	90		100			86		100			dB
		RL = 2kΩ, VCC = ±4V			95					95
	GBP	Gain bandwidth product (F =100kHz)	1.8		3			1.5		2.5			MHz
		Equivalent input noise voltage F = 1kHz, Rs = 100Ω
	en	Rs = 50Ω			8					10			nV
		Rs = 1kΩ			10					12			-----------
													Hz
		Rs = 10kΩ			18					20
	THD	Total harmonic distortion (F = 1kHz, Av = 20dB, RL = 2kΩ,			0.03					0.03			%
		Vo = 2Vpp)
		Output voltage swing
	±Vopp	RL = 2kΩ, VCC = ±15V	±13					±13					V
		RL = 2kΩ, VCC = ±4V			±3					±3
	Vopp	Large signal voltage swing RL = 10kΩ, F= 10kHz			28					28			Vpp
	SR	Slew rate (RL = 2kΩ, unity gain)	0.8		1.5					1			V/µs
	SVR	Supply voltage rejection ratio Tmin < Tamb < Tmax	90					86					dB
	CMR	Common mode rejection ratio Vic = ±10V	90					86					dB
		Tmin < Tamb < Tmax
	Vo1/Vo2	Channel separation (F= 1 kHz)	100		120					120			dB

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LS204	Electrical characteristics

Figure 2. Supply current versus supply voltage

Figure 3. Supply current versus ambient temperature

Figure 4. Output short circuit current versus Figure 5.		Open loop frequency and phase
ambient temperature		response

Figure 6. Output loop gain versus ambient temperature

Figure 7. Supply voltage rejection versus frequency

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