Features

Nano -power:

—OPA369: 800MAh

—OPA2369: 700NA/channel.

Low offset voltage: 250 μV

- Zero Cross

Low offset drift: 0.4 μV/° C

– SC70-5, – SC70-5,, SC70-5. SOT23-5, MSOP-8

Application

Battery power supply instrument

Portable device

Medical care Device

Testing equipment

Low -power sensor signal adjustment

Instructions

In addition to micro -packaging and extremely low static currents, OPAX369 also has 12kHz bandwidth, low offset drift (maximum 1.75 μV/° C) and low noise 3.6 μVPP (0.1Hz to 10Hz).

OPA369 (single version) is provided by SC70-5 software package. OPA2369 (dual version) also provides MSOP-8 and SOT23-8 packages at the same time.

Typical features Unless otherwise explained, otherwise Connect to vs/2 in TA u003d+25 ° C, vs u003d 5V, RL u003d 100K

Application information

In general working mode, the power suppression ratio (AOL-9DB) and power suppression ratio (AOL-9DB) are low working mode.

When designing ultra -low power consumption, please select the system component carefully. In order to reduce current consumption, a large value resistance is selected. Any resistor will react to the amplifier capacitor and the input capacitance of the operation in the circuit. These parasitic RC combinations affect the stability of the entire system. A feedback capacitor may be required to ensure stability and limit over -punch or gain peak.

A good layout specification requires the use of 0.1 μF bypass electrical container, which should be placed on the power pins.

Working voltage

OPA369 series operational amplifier conducted comprehensive regulations and testing in the range of+1.8V to+5.5V (± 0.9V to ± 2.75V). The typical characteristic curve shows parameters with significant changes with the power supply voltage.

Enter the co -mode voltage range

OPA369 series design is used to eliminate most of the input offset transition zone in most rail -to -rail complexation amplifiers, which enables the OPA369 series amplifiers to be entirely in the whole Provide excellent co -model performance within the input range.

The input co -mode voltage range of the OPA369 series is usually extended to each power orbital .cmrr specifically specified from a neat orbit to the right track. See Figure 4, standardized offset voltage and co -mode voltage.

Overvoltage protection input

Input current is often 10Pa. However, large input (greater than 500mV outside the power rail) will cause excess current inflow or outflow input pins. Therefore, in addition to maintaining the input voltage between the power rail, it is also important to limit the input current to less than 10mA. This limit is easy to achieve with an input resistance, as shown in Figure 24.

Battery monitoring

The low -working voltage and static current of the OPA369 series make it the best choice for battery monitoring applications, as shown in Figure 25. In this circuit, as long as the battery voltage is kept above 2V, the V state is very high. Low -power base is used to set the trigger point. The choice of resistance values u200bu200bis as follows:

1. Select RF: Select RF, so that the current through the RF is about 1000 times larger than the maximum bias current at the temperature:

2. Select the stagnation voltage VHYST. For battery monitoring applications, 50MV is enough.

3. Calculate R1 as follows:

4. Select a threshold voltage (VTHRS) u003d 2.0 volts for vehicle recognition number (VIN) increase

5. Calculate R2 RuBelow:

6. Calculate RBIAS: The minimum power supply voltage of the circuit is 1.8V. Ref1112's current requirements are 1.2 μA (maximum). Provide 2 μA power current for Ref1112 to ensure normal work. Therefore:

Window comparator

FIG. 26 shows OPA2369 used as a window comparator. The threshold is set by VH and VL, VH GT; VL. When vin lt; VH, A1 output is low. When vin gt; vl, the output of A2 is low. Therefore, as long as VIN is between VH and VL, the output of the two computing amplifiers is 0V. The result of this structure is that there is no current flowing through any diode, Q1 is cut off, the base voltage is 0V, and VOUT forced height.

If VIN is lower than VL, the output of A2 is high, the current flows over D2, and VOUT is low. Similarly, if VIN rises to VH, the output of A1 is very high, the current flows over D1, and VOUT is low. Window comparator threshold voltage settings are as follows:

Note: