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MAX186BEAP Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX186BEAP Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 24 page 2) Use a general-purpose I/O line on the CPU to pull CS on the MAX186/MAX188 low. 3) Transmit TB1 and simultaneously receive a byte and call it RB1. Ignore RB1. 4) Transmit a byte of all zeros ($00 HEX) and simulta- neously receive byte RB2. 5) Transmit a byte of all zeros ($00 HEX) and simulta- neously receive byte RB3. 6) Pull CS on the MAX186/MAX188 high. Figure 6 shows the timing for this sequence. Bytes RB2 and RB3 will contain the result of the conversion padded with one leading zero and three trailing zeros. The total conversion time is a function of the serial clock frequency and the amount of dead time between 8-bit transfers. Make sure that the total conversion time does not exceed 120µs, to avoid excessive T/H droop. Digital Output In unipolar input mode, the output is straight binary (see Figure 15). For bipolar inputs, the output is twos-complement (see Figure 16). Data is clocked out at the falling edge of SCLK in MSB-first format. Low-Power, 8-Channel, Serial 12-Bit ADCs ______________________________________________________________________________________ 11 SEL2 SEL1 SEL0 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 AGND 00 0 + – 10 0 + – 00 1 + – 10 1 + – 01 0 + – 11 0 + – 01 1 + – 11 1 + – Table 3. Channel Selection in Single-Ended Mode (SGL/ DIFF = 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 4. Channel Selection in Differential Mode (SGL/ DIFF = 0) |
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