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MAX4531CAP Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX4531CAP Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 16 page __________Applications Information Power-Supply Considerations Overview The MAX4530/MAX4531/MAX4532 construction is typi- cal of most CMOS analog switches. They have three supply pins: V+, V-, and GND. V+ and V- 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-. One of these diodes conducts if any analog signal exceeds V+ or V-. During normal operation, these and other reverse-biased ESD diodes leak, forming the only current drawn from V+ or V-. Virtually all of the analog leakage current comes from the ESD diodes. Although the ESD diodes on a given signal pin are identical and therefore fairly well bal- anced, 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 to the V+ and V- pins constitutes the analog-signal-path leakage current. All analog leakage current flows between each pin and one of the supply terminals, not to the other switch ter- minal. For this reason, both sides of a given switch can show leakage currents of either the same or opposite polarity. The analog-signal paths and GND are not connected. V+ and GND power the internal logic and logic-level translators, and set both the input and output logic lim- its. The logic-level translators convert the logic levels into switched V+ and V- signals to drive the analog sig- nals’ gates. This drive signal is the only connection between the logic supplies and signals and the analog supplies. V+ and V- have ESD-protection diodes to GND. The logic-level thresholds are TTL/CMOS compatible when V+ = +5V. As V+ rises, the threshold increases slightly, so when V+ reaches +12V, the threshold is about 3.1V—above the TTL guaranteed, high-level min- imum of 2.8V, but still compatible with CMOS outputs. Bipolar Supplies The MAX4530/MAX4531/MAX4532 operate with bipolar supplies between ±2.0V and ±6V. The V+ and V- sup- plies need not be symmetrical, but their sum cannot exceed the +13V absolute maximum rating. Single Supply The MAX4530/MAX4531/MAX4532 operate from a sin- gle supply between +2V and +12V when V- is connect- ed to GND. All of the bipolar precautions must be observed. At room temperature, they actually work with a single supply at, near, or below +1.7V, although as supply voltage decreases, switch on-resistance and switching times become very high. High-Frequency Performance In 50 Ωsystems, signal response is reasonably flat up to 50MHz (see Typical Operating Characteristics). Above 20MHz, the on response has several minor peaks that are highly layout dependent. The problem is not in turn- ing the switch on, but in turning it off. The off-state switch acts like a capacitor and passes higher frequen- cies with less attenuation. At 10MHz, off isolation is about -65dB in 50 Ωsystems, becoming worse (approxi- mately 20dB per decade) as frequency increases. Higher circuit impedances also make off isolation worse. Adjacent channel attenuation is about 3dB above that of a bare IC socket, and is due entirely to capacitive coupling. Low-Voltage, CMOS Analog Multiplexers/Switches with Enable Inputs and Address Latching _______________________________________________________________________________________ 9 |
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