Description

The AS1542 is a 12-bit high-speed, low-power, 16-channel, successive-approximation ADC that operates from a single 2.7 to 5.25V supply. The device features high throughput rates (1Msps) and a low-noise, wide-bandwidth track-and-hold amplifier that can handle input frequencies in excess of 1 MHz.

The AS1542 features 16 single-ended or 8 fully differential analog inputs with a channel sequencer to allow a programmed selection of channels to be converted sequentially. The conversion time is determined by the SCLK frequency (also used as the master clock to control the conversion).

The conversion process and data acquisition are controlled using a chip select pin and a serial clock signal, allowing the device to easily interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CSN and conversion is also initiated at this point. There are no pipeline delays associated with the device.

The AS1542 uses advanced design techniques to achieve very low power dissipation at high throughput rates. At maximum throughput rates, the AS1542 consumes just 2.8mA (@3.6V), and 3.5mA (@5.25V).

By using internal control register, single-ended or fully-differential conversion mode with different input ranges can be used with either straight binary or twos complement output coding.