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Circuit Principle

2-3 Pulse oximeter Service Manual

Fig 2-3 Data Storage Circuit

2.1.1.4 DAC

DPM1’s analog circuit includes two DAC channels. They are DRIVE channel and OFFSET

channel.

MAX5102A is a 8-bit resolution DAC control chip. The 2.5V reference level was produced

by MAX6066.

Fig 2-4 DA Circuit

2.1.1.5 ADC

DPM1 uses MAX1290 as the ADC, which of 12-bit resolution and 8 channels and parallel

interface. Two signals of SIGNAL and PROBE-DET are collected by the chip. They

directly enter the channel 0 and channel 1 of the ADC without analog switch.

MAX1290 uses separate power supply and the input signal should be in the range of

0V~5V. But the amplitude of the SpO2 signal is between -2.5V and +2.5V. Therefore, a

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Mindray DPM 1 Manual de Serviço Página 15