ADC12130 Datasheet | National Semiconductor

Description The ADC12130, ADC12132 and ADC12138 are 12-bit plus sign successive approximation A/D converters with serial I/O and configurable input multiplexer. The ADC12132 and ADC12138 have a 2 and an 8 channel multiplexer, respectively. The differential multiplexer outputs and A/D inputs are available on the MUXOUT1, MUXOUT2, A/DIN1 and A/DIN2 pins. The ADC12130 has a two channel multiplexer with the multiplexer outputs and A/D inputs internally connected. The ADC12130 family is tested with a 5 MHz clock. On request, these A/Ds go through a self calibration process that adjusts linearity, zero and full-scale errors to typically less than ± 1 LSB each. The analog inputs can be configured to operate in various binations of single-ended, differential, or pseudo-differential modes. A fully differential unipolar analog input range (0V to +5V) can be acmodated with a single +5V supply. In the differential modes, valid outputs are obtained even when the negative inputs are greater than the positive because of the 12-bit plus sign output data format. The serial I/O is configured to ply with the NSC MICROWIRE™. For voltage references, see the LM4040 or LM4041. Features n n n n n n n n Serial I/O (MICROWIRE, SPI and QSPI patible) 2 or 8 channel differential or single-ended multiplexer Analog input sample/hold function Power down mode Programmable acquisition time Variable digital output word length and format No zero or full scale adjustment required 0V to 5V analog input range with single 5V power supply Key Specifications n n n n n n Resolution: 12-bit plus sign 12-bit plus sign conversion time: 8.8 µs (max) 12-bit plus sign throughput time: 14 µs (max) Integral linearity error: ± 2 LSB (max) Single supply: 3.3V or 5V ± 10% Power consumption - 3.3V 15 m W (max) - 3.3V power down 40 µW (typ) - 5V 33 m W (max) - 5V power down 100 µW (typ) Applications n Pen-based puters n Digitizers n Global positioning systems ADC12138 Simplified Block Diagram DS012079-1 TRI-STATE ®...