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MAX378MLP Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX378MLP Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 12 page High-Voltage, Fault-Protected Analog Multiplexers _______________________________________________________________________________________ 9 Digital Interface Levels The typical digital threshold of both the address lines and the EN pin is 1.6V, with a temperature coefficient of about -3mV/°C. This ensures compatibility with 0.8V to 2.4V TTL-logic swings over the entire temperature range. The digital threshold is relatively independent of the supply voltages, moving from 1.6V typical to 1.5V typical as the power supplies are reduced from ±15V to ±5V. In all cases, the digital threshold is referenced to GND. The digital inputs can also be driven with CMOS-logic levels swinging from either V+ to V- or from V+ to GND. The digital input current is just a few nanoamps of leak- age at all input voltage levels, with a guaranteed maxi- mum of 1µA. The digital inputs are protected from ESD by a 30V zener diode between the input and V+, and can be driven ±4V beyond the supplies without drawing excessive current. Operation as a Demultiplexer The MAX378/MAX379 will function as a demultiplexer, where the input is applied to the OUT pin, and the input pins are used as outputs. The MAX378/MAX379 pro- vide both break-before-make action and full fault protec- tion when operated as a demultiplexer, unlike earlier generations of fault-protected multiplexers. Channel-to-Channel Crosstalk, Off Isolation, and Digital Feedthrough At DC and low frequencies, channel-to-channel crosstalk is caused by variations in output leakage cur- rents as the off-channel input voltages are varied. The MAX378 output leakage varies only a few picoamps as all seven off inputs are toggled from -10V to +10V. The output voltage change depends on the impedance level at the MAX378 output, which is RDS(ON) plus the input signal source resistance in most cases, since the load driven by the MAX378 is usually a high impedance. For a signal source impedance of 10k Ω or lower, the DC crosstalk exceeds 120dB. Table 2 shows typical AC crosstalk and off-isolation per- formance. Digital feedthrough is masked by the analog charge injection when the output is enabled. When the output is disabled, the digital feedthrough is virtually unmeasurable, since the digital pins are physically iso- lated from the analog section by the GND and V- pins. The ground plane formed by these lines is continued onto the MAX378/MAX379 die to provide over 100dB isolation between the digital and analog sections. Table 1b. MAX379 Charge Injection +1.7V 0V -1.7V +105pC +73pC +48pC ±10V +5V 0V -5V +215pC +135pC +62pC ±15V +10V 0V -10V +525pC +180pC +55pC ±5V Test Conditions: CL = 1000pF on Out A and Out B; the tabulat- ed analog input level is applied to inputs 1A and 1B; channels 2 through 4 are open circuited. EN = +5V, A1 = 0V, A0 is tog- gled from 0V to 3V at a 2kHz rate. +107pC +74pC +50pC +220pC +139pC +63pC +530pC +185pC +55pC Out A Out B Injected Charge -2pC -1pC -2pC -5pC -4pC -1pC -5pC -5pC 0pC Differential A-B Supply Voltage Analog Input Level Table 2a. Typical Off-Isolation Rejection Ratio Test Conditions: VIN = 20VP-P at the tabulated frequency, RL = 1.5kΩ between OUT and GND, EN = 0V. 20VP-P OIRR = 20 Log ____________ VOUT (P-P) Frequency 100kHz 500kHz 1MHz One Channel Driven 74dB 72dB 66dB All Channels Driven 64dB 48dB 44dB Table 2b. Typical Crosstalk Rejection Ratio Test Conditions: Specified RL connected from OUT to GND, EN = +5V, A0 = A1 = A2 = +5V (Channel 1 selected). 20VP-P at the tabulated frequency is applied to Channel 2. All other channels are open circuited. Similar crosstalk rejection can be observed between any two channels. Frequency 100kHz 500kHz 1MHz FL = 1.5k 70dB 68dB 64dB RL = 10k 62dB 46dB 42dB |
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