General description

LPV32 1/358/324 is a version of low power consumption (9 μALMV321/358/324 per channel). This is another supplement to the LMV321/358/324 series of ordinary operational amplifiers. LPV321 /358/324 is the most cost -effective solution for the application of low voltage and low -power operation, which requires space and low prices. LPV321/358/324 has orbid -orbit output swing capacity and input co -mode voltage range includes ground. They all inhibit the excellent speed and power ratio, and achieve a frequency bandwidth of 5 KHz under the power supply current of only 9 μA. LPV321 provides a 5 -pin SC70 that saves space is about half of the size of 5 stitches SOT23. Small packaging saves the space on the PC board and makes the design a possible small portable electronic device. It also allows designers to put the device at a place where the signal is closer to reduce noise pickup and improve signal integrity. These chips are the national advanced sub -grid BICMOS process. LPV321/358/324 has bipolar input and output levels, which improves noise performance and higher output current drivers.

Features

(for V+ 5V and V 0V, unless there are other descriptions, it is typical value)

guaranteed 2.7V and 5V performance

]

No cross distortion

Save spatial component 5 stitches SC702.0X2.1X1.0 mm

Industrial temperature

Scope 40 ; C To+85 ; C

gain bandwidth multiplication 152 kHz

Low power current

lpv321 9μA

lpv358

15μA [ 123] LPV324 28 Wei An

Output swing between J -rail

@100 k load v+ 3.5 millival

v # 8722; +90 millival

vcm 0.2v to v+ 0.8 volts

Active filter

General low -voltage application

General Portable Equipment

Absolutely maximum rated value (Note 1)

ESD tolerance (Note 2)

Human model [ 123]

LPV324 2000V

LPV358 1500 volts

LPV321 1500 volt

Machine model 100V

Differential input voltage ± power voltage

Power voltage (V+--V negative pole) 5.5 volts [ 123]

Output to V+short circuit (Note 3)

Output pair V-short circuit (Note 4)

Welding information

Infrared rays or flow (20 seconds) 235 235 #730; C

Storage temperature range 65 ; C to 150 ; C

Connect temperature. (TJ, maximum value) (Note 5) 150 ; C

Working value (Note 1)

Power voltage 2.7V to 5V

The temperature range # 8722; 40 ; C to+85 ; C

Thermal resistance (Note 10)

5 -needle SC70 478 ; C/W

] 5 pins sol23 265 ; C/W

8 -needle SOIC 190 ; C/W

8 -needle MSOP 235 ; C/W

14 Needle SOIC 145 ; C/W

14 -needle TSSOP 155 ; C/W

2.7V DC Phaksday

Unless otherwise regulations, TJ 25 # 730; C, V+ 2.7V, V 0V, VCM 1.0V, all the limits of VO V+/2 and R GT; 1 m

5V DC special characteristics

Unless there are other regulations, otherwise TJ 25 ; C, V+ 5V, V 0V, VCM 2.0V, all the limits of VO V+/2 and R GT; 1 m .

Rich body restrictions are suitable for extreme temperature.

5V AC electrical characteristics (continued)

Note 1: Absolute maximum rated value indicates the limit of damage to the device. The working conditions of the work are designed to play the function of the equipment, but the specific performance cannot be guaranteed. Please refer to the electrical characteristics about the specifications and test conditions of the guarantee.

Note 2: Human model, applicable standard MIL-STD-883, method 3015.7. Machine model, applicable standard JESD22-A115-A (Jedec's ESD MM standard)The charged device model, the standard JESD22-C101-C (the ESD FICDM standard of Jedec).

Note 3: The short -circuit to V+will adversely affect the reliability.

Note 4: Short the output to V will adversely affect reliability.

Note 5: The maximum power consumption is the function of TJ (MAX) θJa. The maximum allowable power consumption at any ambient temperature is pd (TJ (MAX) – TA)/θJa. All numbers are suitable for packaging directly welded to the PC board.

Note 6: Typical values represent the most likely parameter specifications determined when the characteristics of the character. The actual typical value may change over time depends on the application and configuration. The typical value is not tested and does not guarantee the production materials.

Note 7: All limits are guaranteed by testing or statistical analysis.

Note 8: RL is connected to V-output voltage to 0.5V ≤VO ≤ 4.5V.

Note 9: connected as a voltage follower, 3V jump input. The specified number is the slower in the positive and negative conversion rate.

Note 10: All numbers are typical, suitable for packaging directly welded to PC boards in static air.

Typical performance characteristics, unless there are other regulations, vs +5V, single power supply, TA 25 degrees Celsius.

The advantages of the application information

LPV321/358/324 LPV321 /358/324 Small size of the software package saves small electronic products on the printing circuit board, such as mobile phones, paging machines, or other portable systems. Low -gesture LPV321/358/324 enables them to be used for PCMCIA type III cards. Signal integrity signal can be signal source and amplifier. By using a smaller amplifier component, LPV321/358/324 can be placed in a place that is closer to the signal, reducing noise pickup and improving signal integrity.

Simplified board layout

These products can help you avoid the layout of your computer board. This means that no additional components, such as capacitors and resistors, for filtering outputs for the long trajectory of unwanted signal computers due to interference.

Low power supply

These devices will help you extend the battery life to the greatest extent. They are the ideal choice of battery power supply system.

Power supply voltage low

NATIONAL provides guarantee performance at 2.7V and 5V. This guarantees the whole life of the entire battery.

Output of the rail

Between the railThe output swing provides the maximum possible dynamic range at the output end. This is particularly important when working at low power voltage.

Input includes ground

Allows directly sensing near GND in the operation of a single power supply. Differential input voltage may be greater than V+damage equipment. Protection should be provided to prevent the input voltage negative voltage exceeding the 0.3V (at 25 degrees Celsius). An input clamping diode, a resistor can be used at the IC input terminal to use the terminal.

Increased load tolerance

LPV321/358/324 can directly drive the unit gain to 200PF without oscillation. The unit gain follower is the most sensitive structure to the capacity load. Direct capacitor load reduces the phase of the amplifier. The combination of the amplifier output impedance and the capacitor causes phase lag. This can cause the underwriting pulse response or oscillation. The heavier vehicle capacitance load can be used to use the circuit in Figure 1.

In FIG. 1, the isolation resistance RISO and the load capacitor CL form a pole, which increases the stability of the entire system by increasing more phases. The ideal performance depends on the value of RISO. The larger the resistance, the more stable the Vout. Figure 2 is a waveform of the output Figure 1, RISO is 100 k , 1000 PF is chlorine.

The circuit in FIG. 3 is improvement of the circuit in the figure 1 because it provides DC accuracy and exchange stability. If there is a load resistor in Figure 1, the output is the voltage divided by RISO and the load resistance. Instead, in Figure 3, RF connects the vehicle identification number (VIN) to RL by using the feedback technology to provide DC accuracy. Be careful when choosing the RF value, due to LPV321/358/324. CF and RISO are used to offset the input of phase habits loss caused by feedback the high -frequency component of the output signal to the inverter of the amplifier, thereby maintaining the phase margin in the entire feedback loop. By increasing the CF value, capacitance drivers can be increased. This will slow down the pulse response.

Input bias current eliminates

LPV321/358/324 series has a bipolar input level. The typical input bias current of this LPV321/358/324 is 1.5 NA5V power. Therefore, the 100 kΩ input resistance will generate 0.15 MV error voltage. By balancing resistance inverter and non -inverter input, the input bias current of the amplifier will be reduced. The circuit input Figure 4 shows how to eliminate error current caused by the input deviation.

Differential amplifier

Differential amplifier allows two volts to reduce, or in special cases, eliminate two signals and two inputs. It can be used as a computing amplifier.Divided into a single -end conversion or rejection of the co -mode signal.

The instrument circuit

The input impedance of the previous difference amplifier was set on the grounds of the input impedance of the differential amplifier. In order to eliminate the problem of low input impedance, one method is to use the voltage follower before each input, as shown in the two instrument amplifiers. The LPV324 of the Sanyun instrument is used to establish a three -movement amplifier instrument amplifier, as shown in Figure 6

The first level of the instrument amplifier is the differential input, the differential input, the difference The output amplifier, with two volt -level followers. These two voltage followers ensure that the input impedance is greater than 100 m The gain of the instrument amplifier is set by the ratio of R2/R1. R3 should equal R1 and R4 equals R2. The matching of R3 and R1 and R4 and R2 affects CMRR. For good CMRR over -temperature and low drift resistors. Make R4 slightly smaller plus a minimum minimum mini -tune device that is best to adjust CMRR between R2 and R4.

Application information (continued)

The dual operation amplifier instrument amplifier amplifier dual -operated instrument can also be used to make high input impedance DC differentizers (Figure 7). Among the three operational amplifiers circuits, the instrument amplifier requires accurate resistance matching to obtain a good co -mode suppression ratio. R4 should be equal to R1, R3 should be equal to R2

Single power inverter amplifier

In some cases, the input signal enters the amplifier and negatives. Because the amplifier is voltage in the single power supply, the pressure of the R3 and R4 is to make the amplifier bias, so that the input signal is input the public voltage range of the input of the amplifier. The capacitor C1 is placed in the inverter input and resistor R1 to prevent DC signals from entering the source of the communication signal, and the vehicle recognition number. The value of the value of R1 and C1 affects the deadline, FC 1/2πr1c1. Therefore, the output signal is centered on the intermediate power supply (if the sterilizer provides V+/2 non -inverted input). The output can be swinged to the two orbit to maximize the signal -to -noise ratio in the low voltage system.

Active filter

Simple low -pass active filter

The simple low -pass filter is shown in Figure 9. Its low -frequency gain (ω → O) is defined by R3/R1. This allows low -frequency gains other than the unit. This filter has 20 DB/Decade attenuation after its corner frequency. R2 should minimize errors caused by R1 and R3 to minimize bais current. The frequency response of this filter is shown in Figure 10

Note that the single transportation amplifier has the source filter to require low quality factor, Q (≤ 10), low frequency, low frequency, low frequency,(≤5 kHz) and low -gain (≤10), or the product of the gain multiplied by Q (≤100).The operating amplifier should have an open loop voltage gain at the highest intervals frequency at least 50 times more than the increase of the gain at this frequency.In addition, the selected amplifier should have the conversion rate that meets the following requirements: the conversion rate ≥0.5 x (ωhv OPP) x 10 6V/μs type, ωh is the highest interest frequency, and VOPP is the output peak voltage.