ADI AD7450ABRMZ

The AD7440/AD7450A1 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 3V or 5V 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 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. The conversion process and data acquisition 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; the conversion is also initiated at this point. The SAR architecture of these parts ensures that there are no pipeline delays. The AD7440 and the AD7450A use advanced design techniques to achieve very low power dissipation at high throughput rates.

• Fast throughput rate: 1 MSPS
• Specified for VDD of 3 V and 5 V
• Low power at max throughput rate: 4 mW max at 1 MSPS with 3 V supplies, 9.25 mW max at 1 MSPS with 5 V supplies
• Fully differential analog input
• Wide input bandwidth: 70 dB SINAD at 100 kHz input frequency
• Flexible power/serial clock speed management
• No pipeline delays
• High speed serial interface: SPI/QSPI/MICROWIRE/DSP compatible
• Power-down mode: 1 μA max
• 8-lead SOT-23 and MSOP packages

• Transducer interface
• Battery-powered systems
• Data acquisition systems
• Portable instrumentation
• Motor control