AD7452 Series

The AD74521is a 12-bit, high speed, low power, successive-approximation (SAR) analog-to-digital converter that features a fully differential analog input. This part operates from a single 3 V or 5 V power supply and features throughput rates up to 555 kSPS.The part contains a low noise, wide bandwidth, differential track-and-hold amplifier (T/H) that can handle input frequencies up to 3.5 MHz. The reference voltage is applied externally to the VREFpin and can be varied from 100 mV to 3.5 V depending on the power supply and what suits the application. The value of the reference voltage determines the common mode voltage range of the part. With this truly differential input structure and variable reference input, the user can select a variety of input ranges and bias points.The conversion process and data acquisition are controlled usingCSand the serial clock allowing the device to interface with Microprocessors or DSPs. The input signals are sampled on the falling edge ofCSand the conversion is also initiated at this point.The SAR architecture of this part ensures that there are no pipeline delays.The AD7452 uses advanced design techniques to achieve very low power dissipation.PRODUCT HIGHLIGHTSOperation with Either 3 V or 5 V Power Supplies.High Throughput with Low Power Consumption. With a 3 V supply, the AD7452 offers 3.3 mW max power consumption for 555 kSPS throughput.Fully Differential Analog Input.Flexible Power/Serial Clock Speed Management. The conversion rate is determined by the serial clock, allowing the power to be reduced as the conversion time is reduced through the serial clock speed increase. This part also features a shutdown mode to maximize power efficiency at lower throughput rates.Variable Voltage Reference Input.No Pipeline Delay.Accurate Control of the Sampling Instant via aCSInput and Once-Off Conversion Control.ENOB > 8 Bits Typically with 100 mV Reference.