전자부품 데이터시트 검색엔진 |
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ISL43231 데이터시트(PDF) 11 Page - Intersil Corporation |
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ISL43231 데이터시트(HTML) 11 Page - Intersil Corporation |
11 / 15 page 11 FN6054.2 February 27, 2006 Detailed Description The ISL43231 analog switch offers a precise switching capability from a bipolar ±2V to ±6V or a single 2V to 12V supply with low on-resistance (39 Ω) and high speed operation (tON =38ns, tOFF = 19ns) with dual 5V supplies. It has an inhibit and inhibit bar pin to simultaneously open all signal paths. It also has a latch bar pin to lock in the last switch address. The device is especially well suited for applications using ±5V supplies. With ±5V supplies the performance (RON, Leakage, Charge Injection, etc.) is best in class. High frequency applications also benefit from the wide bandwidth, and the very high off isolation and crosstalk rejection. Supply Sequencing And Overvoltage Protection With any CMOS device, proper power supply sequencing is required to protect the device from excessive input currents which might permanently damage the IC. All I/O pins contain ESD protection diodes from the pin to V+ and to V- (see Figure 9). To prevent forward biasing these diodes, V+ and V- must be applied before any input signals, and input signal voltages must remain between V+ and V-. If these conditions cannot be guaranteed, then one of the following two protection methods should be employed. Logic inputs can easily be protected by adding a 1k Ω resistor in series with the input (see Figure 9). The resistor limits the input current below the threshold that produces permanent damage, and the sub-microamp input current produces an insignificant voltage drop during normal operation. This method is not applicable for the signal path inputs. Adding a series resistor to the switch input defeats the purpose of using a low RON switch, so two small signal diodes can be added in series with the supply pins to provide overvoltage protection for all pins (see Figure 9). These additional diodes limit the analog signal from 1V below V+ to 1V above V-. The low leakage current performance is unaffected by this approach, but the switch resistance may increase, especially at low supply voltages. Power-Supply Considerations The ISL43231 construction is typical of most CMOS analog switches, in that they have three supply pins: V+, V-, and GND. V+ and V- drive the internal CMOS switches and set their analog voltage limits, so there are no connections between the analog signal path and GND. Unlike switches with a 13V maximum supply voltage, the ISL43231 15V maximum supply voltage provides plenty of room for the 10% tolerance of 12V supplies (±6V or 12V single supply), as well as room for overshoot and noise spikes. This switch device performs equally well when operated with bipolar or single voltage supplies.The minimum recommended supply voltage is 2V or ±2V. It is important to FIGURE 7. CROSSTALK TEST CIRCUIT FIGURE 8. CAPACITANCE TEST CIRCUIT Test Circuits and Waveforms (Continued) 0V or V+ ANALYZER NOA or NCA SIGNAL GENERATOR RL GND ADDX 50 Ω N.C. COMB NOB or NCB EN V- C V+ C COMA EN, LE GND NO or NC COM ADDX IMPEDANCE ANALYZER 0V or V+ EN V- C V+ C EN, LE FIGURE 9. INPUT OVERVOLTAGE PROTECTION V- VCOM VNO or NC OPTIONAL PROTECTION V+ LOGIC DIODE OPTIONAL PROTECTION DIODE OPTIONAL PROTECTION RESISTOR FOR LOGIC INPUTS 1k Ω ISL43231 |
유사한 부품 번호 - ISL43231_06 |
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유사한 설명 - ISL43231_06 |
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