General-purpose, low voltage rail-to-rail output operational amplifiers
Document overview
- Manufacturer or author: STMICROELECTRONICS
- PDF pages: 25
Technical content
Datasheet sections
- 1 Package pin connections
- 2 Absolute maximum ratings and operating conditions
- 3 Electrical characteristics
- 4 Application information
- 4.1 Operating voltages
- 4.2 Input common-mode range
- 4.3 Rail-to-rail output
- 4.4 Input offset voltage drift over temperature
- 4.5 PCB layouts
- 4.6 Macromodel
- 5 Package information
- 5.1 SC70-5 (or SOT323-5) package information
- 5.2 SOT23-5 package information
- 5.3 DFN8 2x2 package information
- 5.4 MiniSO8 package information
- 5.5 SO8 package information
- 5.6 TSSOP14 package information
- 5.7 SO14 package information
- 6 Ordering information
- 7 Revision history
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 the TSV85x series for higher accuracy, stand-by options, and smaller packages
Applications
- Battery-powered applications
- Portable devices
- Signal conditioning
- Active filtering
- Medical instrumentation
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 they can drive capacitive loads. The devices are stable while operating at unity gain. They are offered with industry standard pinouts in tiny packages. TSSOP14 SO8 SO14 SC70-5 MiniSO8DFN8 2x2 Single (LMX321) Dual (LMX358) Quad (LMX324) SOT23-5 Table 1. Device summary
1 Package pin connections
Figure 1. Pin connections for each package (top view)
- The exposed pad of the DFN8 2x2 can be connected to VCC- or left floating.
2 Absolute maximum ratings and operating conditions
Table 2. Absolute maximum ratings (AMR)
- All voltage values, except differential voltage, are with respect to network ground terminal.
- Differential voltages are the non-inverting input termi nal with respect to the inverting input terminal.
- VCC-Vin must not exceed 6 V, Vin must not exceed 6 V.
- Input current must be limited by a resistor in series with the inputs.
- Short-circuits can c ause excessive heating and destructive dissipation.
- Human body model: 100 pF discharged through a 1.5 k Ω resistor between two pins of the device, done for
all couples of pin combinations with other pins floating.
- Machine model: a 200 pF cap is charged to the spec ified voltage, then discharged directly between two
combinations with other pins floating.
- Charged device model: all pins plus package ar e charged together to the specified voltage and then
discharged directly to the ground. Table 3. Operating conditions
3 Electrical characteristics
Table 4. Electrical characteristics at VCC+ = 2.7 V with VCC- = 0 V, Vicm = VCC/2, Tamb = 25° C, and
Table 5. Electrical characteristics at VCC+ = 5 V with VCC- = 0 V, Vicm = VCC/2, Tamb = 25° C, and
- See Section 4.4: Input offset voltage drift over temperature.
Figure 20. Distortion + noise vs. output voltage
4 Application information
4.1 Operating voltages
The LMX321, LMX358, and LMX324 can operate from 2.3 V to 5.5 V. The devices’ parameters are fully specified for 2.7 V and 5 V power supplies. Additionally, the main specifications are guaranteed in extended temperature ranges from -40° C to +125° C.
4.2 Input common-mode range
The LMX321, LMX358, and LMX324 have an input common-mode range that includes ground. The input common-mode range is extended from V CC- - 0.2 V to VCC+ - 1 V, with no output phase reversal.
4.3 Rail-to-rail output
The operational amplifiers’ output levels can go close to the rails: to a maximum of 180 mV above and below the rail when connected to a 10 kΩ resistive load to VCC/2.
4.4 Input offset voltage drift over temperature
The maximum input voltage drift over the temperature variation is defined in Equation 1. Equation 1 for Tmin < T < Tmax.
4.5 PCB layouts
For correct operation, it is advised to add 10 nF decoupling capacitors as close as possible to the power supply pins.
4.6 Macromodel
Accurate macromodels of the LMX321, LMX358, and LMX324 are available on STMicroelectronics’ web site at www.st.com. These models are a trade-off between accuracy and complexity (that is, time simulation) of the LMX321, LMX358, and LMX324 operational amplifiers. They emulate the nominal performances of a typical device within the specified operating conditions mentioned in the datasheet. They also help to validate a design approach and to select the right operational amplifier, but they do not replace on-board measurements. ΔVio
5 Package information
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark.
5.1 SC70-5 (or SOT323 -5) package information
Figure 21. SC70-5 (or SOT323-5) package mechanical drawing Table 6. SC70-5 (or SOT323-5) package mechanical data
5.2 SOT23-5 package information
Figure 22. SOT23-5 package mechanical drawing Table 7. SOT23-5 package mechanical data
5.3 DFN8 2x2 pack age information
Figure 23. DFN8 2x2 package mechanical drawing Figure 24. DFN8 2x2x0.6 mm package mechanical data (pitch 0.5 mm)
Figure 25. DFN8 2x2 footprint recommendation
5.4 MiniSO8 package information
Figure 26. MiniSO8 package mechanical drawing Table 8. MiniSO8 package mechanical data
5.5 SO8 package information
Figure 27. SO8 package mechanical drawing Table 9. SO8 package mechanical data
5.6 TSSOP14 package information
Figure 28. TSSOP14 package mechanical drawing Table 10. TSSOP14 package mechanical data
5.7 SO14 package information
Figure 29. SO14 package mechanical drawing Table 11. SO14 package mechanical data
6 Ordering information
Table 12. Order codes
7 Revision history
Table 13. Document revision history 19-Mar-2012 1 Initial release. Table 12: Order codes: added LMX358IQ2T order code.