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TLV9042 데이터시트(PDF) 22 Page - Texas Instruments

부품명 TLV9042
상세설명  TLV904x Micro-power, 1.2-V, RRIO, 350-kHz Operational Amplifier for Cost-Sensitive Applications
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Table 8-1. TLV904x 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
60 dB
900 MHz
Global system for mobile communications (GSM) applications, radio communication, navigation,
GPS (to 1.6 GHz), GSM, aeronautical mobile, UHF applications
70 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)
79.0 dB
3.6 GHz
Radiolocation, aero communication and navigation, satellite, mobile, S-band
82 dB
5 GHz
802.11a, 802.11n, aero communication and navigation, mobile communication, space and satellite
operation, C-band (4 GHz to 8 GHz)
85 dB
8.3.8 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 8-3 shows the ESD circuits contained in the TLV904x 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.
+
±
V +
+IN
± IN
OUT
Power Supply
ESD Cell
Figure 8-3. Equivalent Internal ESD Circuitry
8.3.9 Input and ESD Protection
The TLV904x family incorporates internal ESD protection circuits on all pins. For input and output pins, this
protection primarily consists of current-steering diodes connected between the input and power-supply pins.
These ESD protection diodes provide in-circuit, input overdrive protection, as long as the current is limited to
10 mA. Figure 8-4 shows how a series input resistor can be added to the driven input to limit the input current.
The added resistor contributes thermal noise at the amplifier input and the value must be kept to a minimum in
noise-sensitive applications.
TLV9042, TLV9044
SBOS836B – MARCH 2020 – REVISED DECEMBER 2020
www.ti.com
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