AD7928 ADC IC Chip

AD7928(8-Channel, 1 MSPS, 1 2-Bit ADCs with Sequencer )

Introduction

The AD7908/AD7918/AD7928 are, respectively, 8-bit, 10-bit, and 12- bit, high speed, low power, 8-channel, successive approximation ADCs. The parts operate from a single 2.7 V to 5.25 V power supply and feature throughput rates up to 1 MSPS. The parts contain a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 8 MHz.

The AD7908/AD7918/AD7928 use advanced design techniques to achieve very low power dissipation at maximum throughput rates.At maximum throughput rates, the AD7908/AD7918/AD7928 consume 2mA maximum with 3 V supplies; with 5 V supplies, the current consumption is 2.7 mA maximum.

Through the configuration of the control register, the analog input range for the part can be selected as 0V to REF_IN or 0V to 2 x REF_IN, with either straight binary or twos complement output coding.The AD7908/AD7918/AD7928 each feature eight single-ended analog inputs with a channel sequencer to allow a preprogrammed selection of channels to be converted sequentially.

The conversion time for the AD7928 is determined by the SCLK frequency, which is also used as the master clock to control the conversion.

Features

• Fast throughput rate: 1 MSPS
• Specified for AVpD of 2.7Vto 5.25 V
• Low power
  –6.0 mW max at 1 MSPS with 3 V supply
  –13.5 mW max at 1 MSPS with 5 V supply
• Eight (single-ended) inputs with sequencer
• Wide input bandwidth：AD7928, 70 dB min SINAD at 50 kHz input frequency
• Flexible power/serial clock speed management
• No pipeline delays
• High speed serial interface SPI®/QSPI™/MICROWIRE™/DSP compatible
• Shutdown mode: 0.5 μA max
• 20-lead TSSOP package
• Qualified for automotive applications

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