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MAX4547CPE Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX4547CPE Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 16 page Typical attenuation in 50 Ω systems is -1dB and is rea- sonably flat up to 100MHz. Higher-impedance circuits show even lower attenuation (and vice versa), but slightly lower bandwidth due to the increased effect of the internal and external capacitance and the switch’s internal resistance. The MAX4545/MAX4546/MAX4547 are optimized for ±5V operation. Using lower supply voltages or a single supply increases switching time, increases on-resis- tance (and therefore on-state attenuation), and increas- es nonlinearity. Switch Off Condition When the switch is off, MOSFETs N1, N2, P1, and P2 are off and MOSFET N3 is on. The signal path is through the off-capacitances of the series MOSFETs, but it is shunted to ground by N3. This forms a high- pass filter whose exact characteristics are dependent on the source and load impedances. In 50 Ω systems, and below 10MHz, the attenuation can exceed 80dB. This value decreases with increasing frequency and increasing circuit impedances. External capacitance and board layout have a major role in determining over- all performance. __________Applications Information Power-Supply Considerations Overview The MAX4545/MAX4546/MAX4547 construction is typi- cal of most CMOS analog switches. It has three supply pins: V+, V-, and GND. V+ and V- are used to drive the internal CMOS switches and set the limits of the analog voltage on any switch. Reverse ESD protection diodes are internally connected between each analog signal pin and both V+ and V-. If the voltage on any pin exceeds V+ or V-, one of these diodes will conduct. During normal operation these reverse-biased ESD diodes leak, forming the only current drawn from V-. Virtually all the analog leakage current is through the ESD diodes. Although the ESD diodes on a given sig- nal pin are identical, and therefore fairly well balanced, they are reverse biased differently. Each is biased by either V+ or V- and the analog signal. This means their leakages vary as the signal varies. The difference in the two diode leakages from the signal path to the V+ and V- pins constitutes the analog signal-path leakage cur- rent. All analog leakage current flows to the supply ter- minals, not to the other switch terminal. This explains how both sides of a given switch can show leakage currents of either the same or opposite polarity. There is no connection between the analog signal paths and GND. The analog signal paths consist of an N-channel and P-channel MOSFET with their sources and drains paralleled and their gates driven out of phase with V+ and V- by the logic-level translators. V+ and GND power the internal logic and logic-level translators, and set the input logic thresholds. The logic-level translators convert the logic levels to switched V+ and V- signals to drive the gates of the analog switches. This drive signal is the only connec- tion between the logic supplies and the analog sup- plies. All pins have ESD protection to V+ and to V-. Increasing V- has no effect on the logic-level thresh- olds, but it does increase the drive to the P-channel switches, reducing their on-resistance. V- also sets the negative limit of the analog signal voltage. The logic-level thresholds are CMOS and TTL compati- ble when V+ is +5V. As V+ is raised, the threshold increases slightly; when V+ reaches +12V, the level threshold is about 3.1V, which is above the TTL output high-level minimum of 2.8V, but still compatible with CMOS outputs. Bipolar-Supply Operation The MAX4545/MAX4546/MAX4547 operate with bipolar supplies between ±2.7V and ±6V. The V+ and V- sup- plies need not be symmetrical, but their sum cannot exceed the absolute maximum rating of 13.0V. Do not connect the MAX4545/MAX4546/MAX4547 V+ pin to +3V and connect the logic-level input pins to TTL logic-level signals. TTL logic-level outputs can exceed the absolute maximum ratings, causing damage to the part and/or external circuits. CAUTION: The absolute maximum V+ to V- differential voltage is 13.0V. Typical “±6-Volt” or “12-Volt” supplies with ±10% tolerances can be as high as 13.2V. This voltage can damage the MAX4545/MAX4546/MAX4547. Even ±5% toler- ance supplies may have overshoot or noise spikes that exceed 13.0V. Single-Supply Operation The MAX4545/MAX4546/MAX4547 operate from a sin- gle supply between +2.7V and +12V when V- is con- nected to GND. All of the bipolar precautions must be observed. Note, however, that these parts are opti- mized for ±5V operation, and most AC and DC charac- teristics are degraded significantly when departing from ±5V. As the overall supply voltage (V+ to V-) is lowered, switching speed, on-resistance, off isolation, and distortion are degraded. (See Typical Operating Characteristics.) Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches _______________________________________________________________________________________ 9 |
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