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Description

The AD7440 / AD7450A are 10-bit and 12-bit high speed, low power, successive approximation (SAR) analog-to-digital converters with a fully differential analog input. These parts operate from a single 3 V or 5 V power supply and use advanced design techniques to achieve very low power
dissipation at throughput rates up to 1 MSPS. The SAR architecture of these parts ensures that there are no pipeline delays. The parts contain 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.

Features

1. Fast throughput rate: 1 MSPS
2. Specified for VDDof 3 V and 5 V
3. Low power at max throughput rate
4. 70 dB SINAD at 100 kHz input frequency
5. Flexible power/serial clock speed management
6. High speed serial interface
7. SPI / QSPI / MICROWIRE / DSP compatible
8. Power-down mode: 1 μA max

Applications

1. Transducer interface
2. Battery-powered systems
3. Data acquisition systems
4. Portable instrumentation
5. Motor control