AD7985BCPZ

AD7985 is a 16bit, 2.5MSPS successive approximation analogue-to-digital converter (SAR ADC). It contains a low power, high speed, 16bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and a versatile serial interface port. On the rising edge of CNV, this samples an analogue input, IN+, between 0V and REF with respect to a ground sense, IN−. It features a very high sampling rate turbo mode (TURBO is high) and a reduced power normal mode (TURBO is low) for low power applications where the power is scaled with the throughput. In normal mode (TURBO is low), the SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus and provide an optional busy indicator. Application includes battery-powered equipment, communications, ATE, data acquisition systems, and medical instruments.

• Maximum conversion rate is 2.5MSPS (AVDD=DVDD=2.5V, BVDD=5V, VIO=1.8V to 2.7V)
• Low power dissipation, minimum resolution is 16bits (AVDD=DVDD=2.5V, TA=-40 to +85°C)
• Typical power dissipation is 28mW (2.5MSPS throughput, AVDD=DVDD=2.5V, TA=-40 to +85°C)
• Typical signal-to-noise ratio, SNR is 87dB (fIN =20KHz, VREF=4.096V, internal, TA =-40 to +85°C)
• Typical integral nonlinearity error is -1.50LSB (AVDD=DVDD=2.5V, BVDD=5V, TA =-40 to +85°C)
• Ability to daisy-chain multiple ADCs with busy indicator
• Allows use of any input range, no pipeline delay
• Typical power supply sensitivity is 90dB (AVDD=2.5V ±5%, TA=−40°C to +85°C)
• Operating temperature rating range from -40 to +85°C
• 20-lead frame chip scale package [LFCSP]

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