The AD7450ARMZ is a 12-bit high-speed, low power, successive approximation Analog-to-digital Converter (ADC) that features a fully differential analog input. This part contains a low noise, wide bandwidth, differential track-and-hold amplifier that can handle input frequencies in excess of 1MHz with the -3dB point typically being 20MHz. 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 and data acquisition processes are controlled using CS and the serial clock, allowing the device to interface with microprocessors or DSPs. The input signals are sampled on the falling edge of CS and the conversion is also initiated at this point. The SAR architecture of this part ensures that there are no pipeline delays. It uses advanced design techniques to achieve low power dissipation at high throughput rates.
GENERAL DESCRIPTION The AD7450 is a 12-bit, high-speed, low power, successive approximation (SAR) analog-to-digital converter that features a fully differential analog input. It operates from a single 3 V or 5 V power supply and features throughput rates up to 833 kSPS or 1 MSPS, respectively. This part contains a low noise, wide bandwidth, differential track and-hold amplifier (T/H) that can handle input frequencies in excess of 1 MHz with the –3 dB point typically being 20 MHz. The reference voltage for the AD7450 is applied externally to the VREF pin 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. FEATURES Fast Throughput Rate: 1 MSPS Specified for VDD of 3 V and 5 V Low Power at Max Throughput Rate: 3.75 mW Max at 833 kSPS with 3 V Supplies 9 mW Max at 1 MSPS with 5 V Supplies Fully Differential Analog Input Wide Input Bandwidth: 70 dB SINAD at 300 kHz Input Frequency Flexible Power/Serial Clock Speed Management No Pipeline Delays High-Speed Serial Interface—SPITM/QSPI™ MICROWIRE™/DSP Compatible Power-Down Mode: 1 μA Max 8-Lead μSOIC and SOIC Packages APPLICATIONS Transducer Interface Battery-Powered Systems Data Acquisition Systems Portable Instrumentation Motor Control Communications