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MAX148BEAP Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX148BEAP Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 23 page +2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs 10 _____________________________________________________________________________________ Table 1. Control-Byte Format Table 2. Channel Selection in Single-Ended Mode (SGL/DIF = 1) How to Start a Conversion Start a conversion by clocking a control byte into DIN. With CS low, each rising edge on SCLK clocks a bit from DIN into the MAX148/MAX149’s internal shift register. After CS falls, the first arriving logic “1” bit defines the control byte’s MSB. Until this first “start” bit arrives, any number of logic “0” bits can be clocked into DIN with no effect. Table 1 shows the control-byte format. The MAX148/MAX149 are compatible with SPI/QSPI and MICROWIRE devices. For SPI, select the correct clock polarity and sampling edge in the SPI control registers: set CPOL = 0 and CPHA = 0. MICROWIRE, SPI, and QSPI all transmit a byte and receive a byte at the same time. Using the Typical Operating Circuit, the simplest software interface requires only three 8-bit transfers to perform a conversion (one 8-bit transfer to configure the ADC, and two more 8-bit transfers to clock out the conversion result). See Figure 20 for MAX148/ MAX149 QSPI connections. BIT 7 (MSB) BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 (LSB) START SEL2 SEL1 SEL0 UNI/BIP SGL//DIF PD1 PD0 BIT NAME DESCRIPTION 7(MSB) START The first logic “1” bit after CS goes low defines the beginning of the control byte. 6 5 4 SEL2 SEL1 SEL0 These three bits select which of the eight channels are used for the conversion (Tables 2 and 3) 3 UNI/BIP 1 = unipolar, 0 = bipolar. Selects unipolar or bipolar conversion mode. In unipolar mode, an analog input signal from 0 to VREF can be converted; in bipolar mode, the signal can range from -VREF/2 to +VREF/2. 2 SGL/DIF 1 = single ended, 0 = differential. Selects single-ended or differential conversions. In single- ended mode, input signal voltages are referred to COM. In differential mode, the voltage difference between two channels is measured (Tables 2 and 3). 1 PD1 Selects clock and power-down modes. 0(LSB) PD0 PD1 PD0 Mode 0 0 Full power-down 0 1 Fast power-down (MAX149 only) 1 0 Internal clock mode 1 1 External clock mode SEL2 SEL1 SEL0 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 COM 0 0 0 + - 1 0 0 + - 0 0 1 + - 1 0 1 + - 0 1 0 + - 1 1 0 + - 0 1 1 + - 1 1 1 + - |
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