The MAX1111CEE+ is a low power, 8bit, 4-channel serial SAR analogue to digital converter (ADC) in 16 pin QSOP package. It has an internal track/hold, voltage reference, clock and serial interface. The device operates from single 2.7V to 5.5V supply and consumes only 85µA while sampling at rates up to 50Ksps. The 4 analogue inputs of MAX1111 are software configurable allowing unipolar/bipolar and single ended/differential operation. Successive approximation conversions are performed using either internal clock or an external serial interface clock. The full scale analogue input range is determined by 2.048V internal reference or by an externally applied reference ranging from 1V to VDD. The MAX1111 has software programmable 2µA automatic power down mode to minimize power consumption. Using power down, the supply current is reduced to 6µA at 1Ksps and 52µA at 10Ksps. It is used in system diagnostics, solar powered remote systems, 4mA to 20mA powered remote data acquisition systems.
4-channel single ended or 2-channel differential inputs
Operating temperature range from 0°C to 70°C
SPI/QSPI/MICROWIRE compatible serial interface
Total unadjusted error of ±0.3LSB and gain error of ±1LSB (internal or external reference)
Integral nonlinearity (INL) of ±0.15LSB at VDD = 2.7V to 3.6V and ±0.2LSB at VDD = 5.5V
Differential nonlinearity (DNL) of ±1LSB, no missing codes over temperature
Offset error of ±0.35LSB at VDD = 2.7V to 3.6V and ±0.5LSB at VDD = 5.5V
Small signal bandwidth (-3dB of roll-off) of 1.5MHz and full power bandwidth of 800KHz
Channel to channel crosstalk of -75dB at 25KHz
Power supply rejection ratio (PSRR) of ±0.4mV at VDD = 2.7V to 3.6V
