ADX827AQFN24
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Low-power, 1000SPS, wide-bandwidth analog-to-digital converter with a programmable gain amplifier.
Product details
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Parameters
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Characteristics
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Package
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Description
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• Optional operating modes
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• High-resolution mode
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– SNR
117dB (1000SPS，gain = 1)
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– Power consumption
5.7mW
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• Low power mode
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– SNR
112dB (1000SPS，gain = 1)
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– Power consumption
3.4mW
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• THD
−123dB
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• Common-mode rejection ratio
107dB
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• High-impedance CMOS PGA
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– Gain
1、2、4、8、16
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• Data rate
62.5SPS to 1000SPS
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QFN24 5mm x 4mm
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• Flexible digital filter
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– Sinc + FIR + IIR (chooseable)
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– Linear and minimum phase response
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– Programmable high-pass filter
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• Offset and gain calibration
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• FIFO buffer
16 samples
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• Temperature sensor
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• Internal oscillator
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• Provide common-mode drive output for a single supply.
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• Synchronous control
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• SPI-compatible interface
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• Analog power supply
5V or ±2.5V
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• Digital power supply
1.8V to 3.3V
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The ADX827 device is a low-power analog-to-digital converter (ADC) that integrates a programmable gain amplifier (PGA) and a finite impulse response (FIR) digital filter. This ADC is suitable for the demanding needs of seismic equipment that requires low-power precise digitization. The ADC features programmable gain, high-impedance complementary metal-oxide-semiconductor (CMOS) amplifiers, making it suitable for directly connecting geophone and hydrophone sensors to the ADC across a wide input signal range (±2.5V to ±0.156V). This ADC contains a fourth-order, inherently stable delta-sigma (ΔΣ) modulator. The digital output of the modulator is filtered and decimated by an internal FIR digital filter to produce the ADC conversion results. The FIR digital filter provides data rates up to 1000 samples per second (SPS). A high-pass filter (HPF) removes DC and low-frequency components from the conversion results. On-chip gain and offset scaling registers support system calibration. Together, the amplifier, modulator, and digital filter dissipate 5.7mW in high-resolution mode (and 3.4mW in low-power mode). This ADC comes in a compact 5mm × 4mm QFN-24 package and is rated for a temperature range of −40°C to 85°C.
