ST LMX321, LMX358, LMX324 User Manual

LMX321, LMX358, LMX324

General-purpose, low voltage rail-to-rail output operational amplifiers

Features

■Low power consumption: 120 µA at 2.7 V

■Low supply voltage: 2.3 V - 5.5 V

■Rail to rail output swing

■Gain bandwidth product: 1.3 MHz

■Extended temperature range: -40°C to +125°C

■No crossover distortion

■No phase reversal

■Tiny packages

Related products

■See TSV85x series for higher accuracy, standby options and smaller packages

Applications

■Battery-powered applications

■Portable devices

■Signal conditioning

■Active filtering

■Medical instrumentation

Datasheet − production data

SC70-5

SOT23-5

MiniSO-8

SO-8

TSSOP14

SO-14

Table 1. Device summary

Description

The LMX3xx series is a set of single, dual and quad low-voltage, general-purpose operational amplifiers. These devices can operate from 2.3 V to 5.5 V with a typical current consumption of 120 μA per channel. The LMX3xx series offers a rail-to-rail output and an input common-mode voltage that includes ground.

The LMX3xx series also exhibits a 1.3 MHz gain bandwidth and can drive capacitive loads. The devices are stable while operating at unity gain. They are offered with industry standard pinouts in tiny packages.

Reference	Single	Dual	Quad
LMX3xx	LMX321	LMX358	LMX324

April 2012

Doc ID 022943 Rev 2

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This is information on a product in full production.

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Package pin connections	LMX321, LMX358, LMX324

1 Package pin connections

Figure 1. Pin connections for each package (top view)

In+	1	5	Out1	1	8	Vcc+
			Vcc+
Vcc-	2		In1-	2	7	Out2
In-	3	4	In1+	3	6	In2-
			Out
			Vcc-	4	5	In2+

SC70-5 / SOT23-5

SO-8 / MiniSO-8

Out1	1	14	Out4
In1-	2	13	In4-
In1+	3	12	In4+
Vcc+	4	11	Vcc-
In2+	5	10	In3+
In2-	6	9	In3-
Out2	7	8	Out3

TSSOP-14 / SO-14

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LMX321, LMX358, LMX324	Absolute maximum ratings and operating conditions

2 Absolute maximum ratings and operating conditions

Table 2.		Absolute maximum ratings (AMR)
Symbol		Parameter		Value	Unit
VCC		Supply voltage(1)		6	V
Vid		Differential input voltage (2)		±VCC	V
V	in	Input pins (IN+ and INpins) voltage (3)	V	- 0.3 to V + 0.3	V
			cc-	cc+
Iin		Input current (4)		10	mA
Tstg		Storage temperature		-65 to +150	°C
		Thermal resistance junction to ambient(5)(6)
		SC70-5		205
		SOT23-5		250
Rthja		MiniSO8		190	°C/W
		SO8		125
		TSSOP14		100
		SO14		105
Tj		Maximum junction temperature		150	°C
		HBM: human body model (7)		4000
ESD		MM: machine model(8)		250	V
		CDM: charged device model(9)		1300
		Latch-up immunity		200	mA

1.All voltage values, except differential voltage, are with respect to network ground terminal.

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

3.VCC-Vin must not exceed 6 V, Vin must not exceed 6 V.

4.Input current must be limited by a resistor in series with the inputs.

5.Short-circuits can cause excessive heating and destructive dissipation.

6.Rth are typical values.

7.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.

8.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.

9.Charged device model: all pins plus package are charged together to the specified voltage and then discharged directly to the ground.

Table 3.	Operating conditions
Symbol	Parameter	Value	Unit
VCC	Supply voltage	2.3 to 5.5	V
Vicm	Common mode input voltage range	VCC- - 0.2 to VCC+ - 1	V
Toper	Operating free air temperature range	-40 to +125	°C

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Electrical characteristics	LMX321, LMX358, LMX324

3 Electrical characteristics

Table 4. Electrical characteristics at VCC+ = 2.7 V with VCC- = 0 V, Vicm = VCC/2, Tamb = 25° C, and RL connected to VCC/2 (unless otherwise specified)

Symbol	Parameter	Conditions	Min.	Typ.	Max.	Unit
DC performance
Vio	Input offset voltage				4	mV
		-40°C < T< 125°C			6
V / T	Input offset voltage drift(1)	-40°C < T< 125°C		1		μV/°C
io
Iio	Input offset current	Vout = Vcc/2		0.5	30	nA
		-40°C < T< 125°C			50
Iib	Input bias current	Vout = Vcc/2		27	60	nA
		-40°C < T< 125°C			110
	Common mode rejection ratio	Vic = 0 V to Vcc-1 V,	70	75
CMR		Vout = Vcc/2				dB
	20 log ( Vicm/ Vio)
		-40°C < T< 125°C	68
		RL = 10 kΩ,	100	110
		Vout = 0.5 V to (Vcc-0.5 V)
Avd	Large signal voltage gain	-40°C < T< 125°C	90			dB
		RL = 2 kΩ,	90	100
		Vout = 0.5 V to (Vcc-0.5 V)
		-40°C < T< 125°C	80
		RL = 10 kΩ,		10	100
VCC-VOH	High level output voltage	-40°C < T< 125°C			200	mV
		RL = 2 kΩ		40	300
		-40°C < T< 125°C			400
		RL = 10 kΩ,		65	180
VOL	Low level output voltage	-40°C < T< 125°C			280	mV
		RL = 2 kΩ,		120	300
		-40°C < T< 125°C			400
	Isink	Vout = Vcc, Vid = -1 V	15	26		mA
Iout		-40°C < T< 125°C	15
	Isource	Vout = 0 V, Vid = 1 V	15	21		mA
		-40°C < T< 125°C	12
ICC	Supply current (per channel)	No load, Vout = VCC/2		120	180	µA
		-40°C < T< 125°C			180

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LMX321, LMX358, LMX324				Electrical characteristics
Table 4.	Electrical characteristics at VCC+ = 2.7 V with VCC- = 0 V, Vicm = VCC/2, Tamb = 25° C,
	and RL connected to VCC/2 (unless otherwise specified) (continued)
Symbol	Parameter		Conditions	Min.	Typ.	Max.	Unit
AC performance
GBP	Gain bandwidth product	RL > 1 MΩ, CL = 200 pF			1.3		MHz
Fu	Unity gain frequency	RL > 1 MΩ, CL = 200 pF			1		MHz
Φm	Phase margin	RL > 1 MΩ, CL = 200 pF			60		degrees
Gm	Gain margin	RL > 1 MΩ, CL = 200 pF			10		dB
SR	Slew rate	RL > 1 MΩ, CL = 200 pF			0.6		V/μs
		Vout = 0.5 V to VCC - 0.5 V
		f = 1 kHz			31		nV
en	Equivalent input noise voltage	f = 10 kHz			20		-----------
							Hz
in	Equivalent input noise current	f = 1 kHz			0.30		pA
							-----------
							Hz
		fin = 1 kHz, ACL = 1,
THD+N	Total harmonic distortion + noise	RL = 10 kΩ,			0.002		%
		V	= V /2, BW = 22 kHz,
		ICM	CC
		Vout = 1 Vpp

Table 5. Electrical characteristics at VCC+ = 5 V with VCC- = 0 V, Vicm = VCC/2, Tamb = 25° C, and RL connected to VCC/2 (unless otherwise specified)

Symbol	Parameter	Conditions	Min.	Typ.	Max.	Unit
DC performance
Vio	Input offset voltage				4	mV
		-40°C < T< 125°C			6
V / T	Input offset voltage drift(1)	-40°C < T< 125°C		1		μV/°C
io
Iio	Input offset current	Vout = Vcc/2		0.5	30	nA
		-40°C < T< 125°C			50
Iib	Input bias current	Vout = Vcc/2		27	60	nA
		-40°C < T< 125°C			110
	Common mode rejection ratio	Vic = 0 V to Vcc-1V,	72	75
CMR		Vout = Vcc/2				dB
	20 log ( Vicm/ Vio)
		-40°C < T< 125°C	70
SVR	Supply voltage rejection ratio	Vcc = 2.5 to 5 V	72	79		dB
	20 log ( Vcc/ Vio)	-40°C < T< 125°C	70
		RL = 10 kΩ,	100	110
		Vout = 0.5 V to (VCC - 0.5 V)
Avd	Large signal voltage gain	-40°C < T< 125°C	90			dB
		RL = 2 kΩ,	90	100
		-40°C < T< 125°C	80

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Electrical characteristics					LMX321, LMX358, LMX324
Table 5.	Electrical characteristics at VCC+ = 5 V with VCC- = 0 V, Vicm = VCC/2, Tamb = 25° C, and
	RL connected to VCC/2 (unless otherwise specified) (continued)
Symbol	Parameter			Conditions	Min.	Typ.	Max.	Unit
		RL = 10 kΩ				10	100
VCC-VOH	High level output voltage	-40°C < T< 125°C					200	mV
		RL = 2 kΩ,				40	300
		-40°C < T< 125°C					400
		RL = 10 kΩ				65	180
VOL	Low level output voltage	-40°C < T< 125°C					280	mV
		RL = 2 kΩ				120	300
		-40°C < T< 125°C					400
	Isink	Vout = VCC, Vid = -1 V			35	43		mA
Iout		-40°C < T< 125°C			25
	Isource	Vout = 0 V, Vid = 1 V			60	70		mA
		-40°C < T< 125°C			50
ICC	Supply current (per channel)	No load, Vout = VCC/2				130	180	µA
		-40°C < T< 125°C					180
AC performance
GBP	Gain bandwidth product	RL > 1 MΩ, CL = 200 pF				1.3		MHz
Fu	Unity gain frequency	RL > 1 MΩ, CL = 200 pF				1		MHz
Φm	Phase margin	RL > 1 MΩ, CL = 200 pF				60		degrees
Gm	Gain margin	RL > 1 MΩ, CL = 200 pF				10		dB
SR	Slew rate	RL > 1 MΩ, CL = 200 pF				0.7		V/μs
		Vout = 0.5 V to VCC - 0.5V
		f = 1 kHz				30		nV
en	Equivalent input noise voltage	f = 10 kHz				20		-----------
								Hz
in	Equivalent input noise current	f = 1 kHz				0.30		pA
								-----------
								Hz
		fin = 1 kHz, ACL = 1,
THD+N	Total harmonic distortion + noise	RL = 10 kΩ,				0.002		%
		V	ICM	= V /2, BW = 22 kHz,
				CC
		Vout = 1 Vpp

1. See Chapter 4.4: Input offset voltage drift over temperature.

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LMX321, LMX358, LMX324	Electrical characteristics
Figure 2. Supply current vs. supply voltage at	Figure 3. Vio distribution at VCC = 5 V
Vicm = VCC/2

	0.20
					T=25°C
			T=125°C
(mA)	0.15
Current	0.10
			T=-40°C
Supply
	0.05
			Vicm=Vcc/2
	0.00	3.0	3.5	4.0	4.5	5.0	5.5
	2.5

Supply Voltage (V)

	30
		Vcc=5V
	25	Vicm=2.5V
		T=25°C
(%)	20
Population	15
	10
	5
	0
	-4.0	-3.5 -3.0	-2.5	-2.0	-1.5	-1.0	-0.5	0.0	0.5	1.0	1.5	2.0	2.5	3.0	3.5	4.0

Input offset voltage (mV)

Figure 4. Input offset voltage vs. input	Figure 5. Output current vs. output voltage at
common mode voltage at VCC = 5 V	VCC = 2.7 V

	1.0
	0.9
(mV)	0.8
	0.7
Voltage
	0.6
	0.5
Offset
	0.4	T=125°C			T=25°C
	0.3						T=-40°C
Input
	0.2
	0.1			Vcc=5V
	0.0	0.5	1.0	1.5	2.0	2.5	3.0	3.5	4.0
	0.0

Input Common Mode Voltage (V)

	30
		Sink
	20	Vid=-1V
(mA)	10		T=125°C		T=25°C	T=-40°C
Current	0				Vcc=2.7V
Output	-10	T=125°C			T=-40°C
				T=25°C
	-20
							Source
	-30						Vid=1V
	0.0		0.5	1.0	1.5	2.0	2.5
				Output Voltage (V)

Figure 6. Output current vs. output voltage at Figure 7. VCC = 5 V

Output current vs. supply voltage at Vicm = VCC/2

	100
	75	Sink			T=25°C				T=-40°C
		Vid=-1V
(mA)	50
	25
Current	0			T=125°C				Vcc=5V
	-25
Output		T=125°C			T=25°C
	-50
	-75										Source
								T=-40°C
	-100										Vid=1V
	0.0		0.5	1.0	1.5	2.0	2.5	3.0	3.5	4.0	4.5	5.0
					Output Voltage (V)

	100
	75	Vid=Sink-1V		T=25°C			T=-40°C
(mA)	50	T=125°C
	25
Current	0						Vicm=Vcc/2
	-25
Output
	-50	T=125°C
	-75	Source		T=25°C
					T=-40°C
	-100	Vid=1V
		2.5	3.0	3.5	4.0	4.5	5.0	5.5
				Supply Voltage (V)

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