OPA241 series is optimized for+5V power supply.

OPA251 series is ± 15V power optimization.

Features

● Micro power: IQ u003d 25 μA

● Single power operation

● Rail transition from orbit (within 50mv)

] ● The supply range is wide

- Single power supply:+2.7V to+36V

- Dual power supply: ± 1.35V to ± 18V

● Low offset voltage: Maximum ± 250 μV

● High -model suppression: 124DB

● High -open ring gain: 128DB

● Single, double and fourth road

Application

● Battery operation instrument

● Portable equipment

● Medical equipment

● Test equipment

OPA241 series and series and The OPA251 series is designed for portable applications for battery power. In addition to extremely low power consumption (25 μA), these amplifiers also have the characteristics of low bias voltage, between rail output swing, high -co -model suppression, and high open ring gain.

The OPA241 series is optimized by running at low power supply, while the OPA251 series is optimized for high -power power supply. Both power supplies can work at single power supply (+2.7V to+36V) or dual power supply (± 1.35V to ± 18V). The input co -mode voltage range is extended to a single power supply application below the 200 millivoltage of the negative power supply.

They are stable unit gains and can drive large capacity loads. Special designs consider ensuring that these products are easy to use. When the amplifier swings to the specified limit, it can still maintain high performance. Because the initial offset voltage (maximum ± 250 μV) is very low, user adjustment is usually not required. However, it provides external decoration sales for special applications (only a single version).

OPA241 and OPA251 (single version) provide standard 8-pin DIP and SO-8 surface installation package. That OPA2241 and OPA2251 (dual version) are installed and packaged with 8-pin DIP and SO-8 surfaces. OPA4241 and OPA4251 (four cores) provide 14-pin DIP and SO-14 surface installation packaging. All devices are completely stipulated between -40 ° C to+85 ° C, and run at -55 ° C to+125 ° C.

Pin instructions

Typical performance curve

Unless otherwise explained, it is in TA u003d+25 ° C and andRL u003d 100K connect to vs/2 (VS's ground u003d ± 15V).

Unless there are other regulations, the curve is suitable for OPA241 and OPA251.

Application information OPA241 and OPA251 series The unit gain is stable and suitable for extensive universal applications. 0.01 μF ceramic capacitors should be used to bypass the power. Working voltage

The OPA241 series is a laser fine -tuning low -dimensional voltage and drift at low power supply voltage (vs u003d+5V). The OPA251 series is adjusted to ± 15V. With the voltage offset to 36V ± 2.V, the voltage drift range of some products is+36V ± 2. However, all other parameters have similar properties. The key parameters are within the specified temperature range, that is, -40 ° C to+85 ° C. Without the entire working voltage range, most of the performance remains unchanged. The typical performance curve shows parameters with significant changes in operating voltage or temperature.

Filter the bias voltage

As mentioned earlier, the offset voltage of the OPA241 series was adjusted to+5V by laser. The offset voltage of the OPA251 series is adjusted to ± 15V. Because the initial offset is very low, user adjustment is usually not required. However, OPA241 and OPA251 (Single Transportation Empeers Version) provides bias voltage connections on the pin 1 and 5. As shown in Figure 1, the offset voltage can be adjusted by the connection potential meter. This adjustment is only used to make the operational amplifier's offset to zero, rather than adjusting the system's offset or signal source. Zero offset will reduce the offset drift of the operation amplifier. Although the exact change of drift cannot be predicted, the impact is usually small.

Capability load and stability

OPA241 series and OPA251 series can drive various capacitance loads. However, under certain conditions, all operational amplifiers may be unstable. The configuration, gain, and load value of the operation amplifier are only a few factors to consider when determining the stability.

FIG. 2 and Figure 3 showed the OPA241 series and the OPA251 series with potential instability. As shown in the figure, low -power unit gain structure is most likely to be affected by capacity loads. When VS u003d+5V, G u003d+1, IOUT u003d 0, the operation remains stable, and the load capacitance is about 200pf. Increasing power supply voltage, output current, and/or gain can significantly improve the capacitor load driver. For example, increase the power to ± 15V, increase the gain to 10, and drive about 2700pf.

A recipe of capacitor load driving in the increase in unit gain configurationThe law is inserted into a resistance in the feedback loop, as shown in Figure 4.This reduces the bell when the large capacitor load is loaded, while maintaining the accuracy of DC.For example, in the case of VS u003d ± 1.35V and RS u003d 5K , the OPA241 series and OPA251 series perform well when the capacitance load exceeds 1000PF.Without series resistance, the capacitor load driver is usually 200PF under these conditions.However, this method will minimize the output voltage swing.