OPA310 datasheet(29/50 Pages) TI

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Table 8-1. OPAx310 EMIRR IN+ for Frequencies of Interest

FREQUENCY

APPLICATION OR ALLOCATION

EMIRR IN+

400 MHz

Mobile radio, mobile satellite, space operation, weather, radar, ultra-high frequency (UHF)

applications

48 dB

900 MHz

Global system for mobile communications (GSM) applications, radio communication, navigation,

GPS (to 1.6 GHz), GSM, aeronautical mobile, UHF applications

58 dB

1.8 GHz

GSM applications, mobile personal communications, broadband, satellite, L-band (1 GHz to 2 GHz)

75 dB

2.4 GHz

802.11b, 802.11g, 802.11n, Bluetooth®, mobile personal communications, industrial, scientific and

medical (ISM) radio band, amateur radio and satellite, S-band (2 GHz to 4 GHz)

90 dB

3.6 GHz

Radiolocation, aero communication and navigation, satellite, mobile, S-band

95 dB

5 GHz

802.11a, 802.11n, aero communication and navigation, mobile communication, space and satellite

operation, C-band (4 GHz to 8 GHz)

102 dB

8.3.7 ESD and Electrical Overstress

Designers often ask questions about the capability of an operational amplifier to withstand electrical overstress.

These questions tend to focus on the device inputs, but can involve the supply voltage pins or even the output

pin. Each of these different pin functions have electrical stress limits determined by the voltage breakdown

characteristics of the particular semiconductor fabrication process and specific circuits connected to the pin.

Additionally, internal electrostatic discharge (ESD) protection is built into these circuits to protect them from

accidental ESD events both before and during product assembly.

Having a good understanding of this basic ESD circuitry and its relevance to an electrical overstress event is

helpful. Figure 8-5 shows the ESD circuits contained in the OPAx310 devices. The ESD protection circuitry

involves several current-steering diodes connected from the input and output pins and routed back to the internal

power supply lines, where they meet at an absorption device internal to the operational amplifier. This protection

circuitry is intended to remain inactive during normal circuit operation.

Note that the OPAx310 features no current-steering diodes connected between the input and positive power-

supply pin.

–

V+

V–

+IN

– IN

OUT

Power Supply

ESD Cell

SHDN

Figure 8-5. Equivalent Internal ESD Circuitry

8.3.8 Input ESD Protection

The OPAx310 family incorporates internal ESD protection circuits on all pins. For inputs, this protection primarily

consists of fail safe ESD input structures which feature no current-steering diodes connected between the input

and positive power-supply pin as shown in the Figure 8-5. This feature is very useful during power sequencing

scenarios where input signal can be present before the positive power supply rail. A fail safe input ESD structure

prevents any short between inputs and positive power supply.

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OPA310, OPA2310, OPA4310

SBOSAA1B – APRIL 2022 – REVISED JULY 2022

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