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MAX11045ECB+ Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX11045ECB+ Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 20 page 4-/6-/8-Channel, 16-Bit, Simultaneous-Sampling ADCs ______________________________________________________________________________________ 11 the extremes of the transfer function if VIN is driven beyond ±VAVDD. To make use of the input clamps (see Figure 1), con- nect a resistor (RS) between the analog input and the voltage source to limit the voltage at the analog input so that the fault current into the MAX11044/MAX11045/ MAX11046 does not exceed ±20mA. Note that the volt- age at the analog input pin limits to approximately 7V during a fault condition so the following equation can be used to calculate the value of RS: where VFAULT_MAX is the maximum voltage that the source produces during a fault condition. Figures 2 and 3 illustrate the clamp circuit voltage-cur- rent characteristics for a source impedance RS = 1280 Ω. While the input voltage is within the ±(VAVDD + 300mV) range, no current flows in the input clamps. Once the input voltage goes beyond this voltage range, the clamps turn on and limit the voltage at the input pin. R VV mA S FAULT MAX _ = -7 20 MAX11044 MAX11045 MAX11046 CLAMP S/H 16-BIT ADC CLAMP INPUT SIGNAL PIN VOLTAGE RS S/H 16-BIT ADC REF BUF CONFIGURATION REGISTERS INTERFACE AND CONTROL BANDGAP REFERENCE CH0 AVDD AGNDS AGND CH7 SOURCE DB15 DB0 DB3 DB4 EOC SHDN CONVST CS RD WR DGND DVDD RDC REFIO INT REF EXT REF Figure 1. Required Setup for Clamp Circuit SIGNAL VOLTAGE AT SOURCE AND PIN (V) -10 -30 30 10 30 -30 10 -10 -20 20 0 -50 50 RS = 1280 Ω VAVDD = 5V AT CH_ INPUT AT SOURCE Figure 2. Input Clamp Characteristics SIGNAL VOLTAGE AT SOURCE AND PIN (V) -4 -6 246 0 -2 30 -30 10 -10 -20 20 0 -8 8 RS = 1280 Ω VAVDD = 5V AT CH_ INPUT AT SOURCE Figure 3. Input Clamp Characteristics (Zoom In) |
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