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MAX1245 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX1245 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 21 page +2.375V, Low-Power, 8-Channel, Serial 12-Bit ADC 10 ______________________________________________________________________________________ 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 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 Power-down (IQ = 1.2µA) 0 1 Unassigned 1 0 Internal clock mode 1 1 External clock mode Table 1. Control-Byte Format SEL2 SEL1 SEL0 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 COM 00 0 + – 10 0 + – 00 1 + – 10 1 + – 01 0 + – 11 0 + – 01 1 +– 11 1 + – Table 2. Channel Selection in Single-Ended Mode (SGL/D DIIF F = 1) SEL2 SEL1 SEL0 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 00 0 + – 00 1 + – 01 0 + – 01 1 +– 10 0 – + 10 1 – + 11 0 – + 11 1 –+ Table 3. Channel Selection in Differential Mode (SGL/D DIIF F = 0) |
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