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MAX1270ACAI Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX1270ACAI Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 20 page Multirange, +5V, 8-Channel, Serial 12-Bit ADCs 10 ______________________________________________________________________________________ Input Bandwidth The ADC’s input small-signal bandwidth depends on the selected input range and varies from 1.5MHz to 5MHz (see Electrical Characteristics). The MAX1270B/ MAX1271B maximum sampling rate is 110ksps (100ksps for the MAX1270A/MAX1271A). By using undersampling techniques, it is possible to digitize high-speed transient events and measure periodic signals with bandwidths exceeding the ADC’s sampling rate. To avoid high-frequency signals being aliased into the frequency band of interest, anti-aliasing filtering is rec- ommended. Input Range and Protection The MAX1270/MAX1271 have software-selectable input ranges. Each analog input channel can be indepen- dently programmed to one of four ranges by setting the appropriate control bits (RNG, BIP) in the control byte (Table 1). The MAX1270 has selectable input ranges extending to ±10V (±VREF x 2.441), while the MAX1271 has selectable input ranges extending to ±VREF. Figure 4 shows the equivalent input circuit. A resistor network on each analog input provides ±16.5V fault protection for all channels. Whether or not the channel is on, this circuit limits the current going into or out of the pin to less than 2mA. This provides an added layer of protection when momentary overvolt- ages occur at the selected input channel, when a neg- ative signal is applied to the input, and when the device is configured for unipolar mode. The overvoltage pro- tection is active even if the device is in power-down mode or if VDD = 0. Digital Interface The MAX1270/MAX1271 feature a serial interface that is fully compatible with SPI/QSPI and MICROWIRE devices. For SPI/QSPI, set CPOL = 0, CPHA = 0 in the SPI control registers of the microcontroller. Figure 5 shows detailed serial-interface timing information. See Table 1 for details on programming the input control byte. tCSH tCSS tCL tDS tDH tDV tCH tDO tTR tCSH CS SCLK DIN DOUT Figure 5. Detailed Serial-Interface Timing R3 5.12k Ω R2 R1 CH_ S1 S2 S3 S4 BIPOLAR UNIPOLAR VOLTAGE REFERENCE T/H OUT HOLD TRACK TRACK HOLD OFF ON CHOLD S1 = BIPOLAR/UNIPOLAR SWITCH S2 = INPUT MUX SWITCH S3, S4 = T/H SWITCH R1 = 12.5k Ω (MAX1270) or 5.12k Ω (MAX1271) R2 = 8.67k Ω (MAX1270) or ∞ (MAX1271) Figure 4. Equivalent Input Circuit |
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