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MAX146 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX146 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 24 page +2.7V, Low-Power, 8-Channel, Serial 12-Bit ADCs ______________________________________________________________________________________ 11 BIT NAME DESCRIPTION 7(MSB) START The first logic “1” bit after CS goes low defines the beginning of the control byte. 6 SEL2 These three bits select which of the eight channels are used for the conversion (Tables 2 and 3). 5 SEL1 4 SEL0 3 UNI/BIP 1 = unipolar, 0 = bipolar. Selects unipolar or bipolar conversion mode. In unipolar mode, an analog input signal from 0V 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 (MAX146 only) 1 0 Internal clock mode 1 1 External clock mode Table 1. Control-Byte Format BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 (MSB) (LSB) START SEL2 SEL1 SEL0 UNI/BIP SGL/DIF PD1 PD0 Table 2. Channel Selection in Single-Ended Mode (SGL/DIF = 1) 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 + – Table 3. Channel Selection in Differential Mode (SGL/DIF = 0) SEL2 SEL1 SEL0 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 0 0 0 + – 0 0 1 + – 0 1 0 + – 0 1 1 + – 1 0 0 – + 1 0 1 – + 1 1 0 – + 1 1 1 – + |
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