ADAQ7767-1中文资料Flexible Resistive Input, Anti-Alias, 24-Bit, 1 MSPS, μModule DAQ Solution数据手册ADI规格书

描述 Description

The ADAQ7767-1 is a 24-bit precision data acquisition (DAQ)μModule® system that encapsulates signal conditioning, conversion,and processing blocks into one system in package (SiP)design that enables rapid development of highly compact, high performance precision DAQ systems..

The ADAQ7767-1 consists of the following:

A fourth order, low noise, linear phase anti-aliasing filter (AAF) A low noise, low distortion, high bandwidth, gain-selectable ADC driver plus an optional linearity boost buffer A high-performance medium bandwidth 24-bit sigma delta ADC with programmable digital filter A low noise, low dropout (LDO) linear regulator Reference buffers Critical passive components required for the signal chain The ADAQ7767-1 supports a wide variety of input types, whichinclude unipolar and bipolar single-ended, pseudo differential, anddifferential signals, with a maximum differential range of ±28.672V and a common-mode voltage range of −16 V to +12 V usingIN3. With the precision of Analog Devices iPASSIVES™ technology,the ADAQ7767-1 performs with excellent common-mode rejectionratio (CMRR). The three pairs of pin-selectable gain settings offeradditional system dynamic range and improved signal chain noiseperformance with input signals of lower amplitude. In applicationsrequiring high input impedance, the ADAQ7767-1 allows the customerto choose their preferred input amplifier.

A fourth-order low-pass analog filter combined with the user-programmabledigital filter ensures that the signal chain is protectedagainst the high frequency noise and out of band tones presentedat the input node from aliasing back into the band of interest.The analog low pass filter is carefully designed to achieve highphase linearity and maximum in-band magnitude response flatness.Constructed with iPASSIVES technology, the resistor network usedwithin the analog low-pass filter possess superior resistance matchingin both absolute values and over temperature. As a result, thesignal chain performance is maintained with minimum drift overtemperature, and the ADAQ7767-1 has an excellent device-to-devicephase matching performance.

A high-performance analog-to-digital (ADC) driver amplifier ensuresthe full settling of the ADC input at the maximum sampling rate.The driver circuit is designed to have minimum additive noise,error, and distortion while maintaining stability. The fully differentialarchitecture helps maximizing the signal chain dynamic range.

The ADC inside the ADAQ7767-1 is a high performance, 24-bit precision,single-channel, Σ-Δ converter with excellent AC performanceand DC precision, and a throughput rate of 1 MSPS from a 16.384MHz MCLK. The device includes an optional linearity boost bufferthat can further improve the signal chain linearity.

The ADAQ7767-1 is specified with an input reference voltage of4.096 V, but the device can support reference voltages ranging fromVDD_ADC down to 1 V.

The ADAQ7767-1 has two types of reference buffers: a prechargereference buffer to ease the reference input driving requirement, ora full reference buffer to provide a high impedance reference input.Both buffers are optional and can be turned off through registerconfiguration.

The ADAQ7767-1 supports three clock input types: crystal, complementarymetal-oxide semiconductor (CMOS), or low voltagedifferential signaling (LVDS).

Three types of digital low pass filters are available on theADAQ7767-1. The wideband, low ripple, finite impulse response(FIR) filter has a filter profile similar to an ideal brick wall filter,making it a great fit for doing frequency analysis. The sinc5 filterhas a low latency path with a smooth step response while maintaininga good level of aliasing rejection. This filter supports anoutput data rate up to 1.024 MSPS from a 16.384 MHz MCLK,making the sinc5 filter ideal for low latency data capturing andtime domain analysis. The sinc3 filter supports a wide decimationratio and can produce output data rates down to 50 SPS from a16.384 MHz controller clock signal (MCLK). This combined withthe simultaneous 50 Hz/60 Hz rejection post filter makes the sinc3filter especially useful for precision DC measurement. All threedigital filters on the ADAQ7767-1 are FIR filters with linear phaseresponse. The bandwidth of the filters, which directly correspondsto the bandwidth of the DAQ signal chain, are fully programmablethrough register configuration.

The ADAQ7767-1 supports two device configuration methods. Theuser has the option to choose to configure the device via registerwrite through its serial peripheral interface (SPI) or through a simplehardware pin strapping method to configure the device to operateunder a number of predefined modes.

A single SPI supports both the register access and the sample datareadback functions. The ADAQ7767-1 always acts as a SPI target.Multiple interface modes are supported with a minimum of threeinput and output channels required to communicate with the device.

The ADAQ7767-1 features a suite of internal diagnostic functionsthat can detect a broad range of errors during operation to helpimprove system reliability.

The ADAQ7767-1 supply connections can be simplified by using itsinternal low dropout (LDO) regulator. Note that, 0.1 μF decouplingcapacitors are also integrated to further reduce the number ofdiscrete components.

Each functional block of the device can be put into standby mode orpower-down mode, enabling the ADAQ7767-1 to have a total powerconsumption less than 0.5 mW.

The ADAQ7767-1 has an operating temperature range of −40°C to+105°C and is available in a 12 mm x 6 mm, 84-ball CSP_BGApackage with 0.8 mm ball pitch, making it suitable for multiple-channelapplications. The footprint of the ADAQ7767-1 is eight timessmaller compared to the footprint of the same solution using discretecomponents.

APPLICATIONS

Universal input measurement platform Electrical Test and Measurement Sound and Vibration, Acoustic and Material Science, research and development Control and Hardware in Loop Verification Condition monitoring for predictive maintenance Audio TestProtected by U.S. Patent 10,680,633 B1Protected by U.S. Patent 10,979,062 B2

特性 Features

• Highly integrated data acquisition solution•3 pin-selectable gain options: 1 (IN1), 0.364 (IN2), or 0.143 (IN3)•Maximum input range of ±28.672 V differential (IN3)•Wide input common-mode range: −16 V to +12 V (IN3)•Fourth-order AAF with maximum flatness and linear phase•Anti-aliasing protection with 105 dB typical rejection (IN1)


•Excellent device-to-device phase matching and drift

• Combined precision ac and dc performance
• Total system dynamic range up to 124 dB

• -118 dB typical THD at ±28.672 V input range (IN3)

• 78.0 dB typical DC CMRR at ±28.672 V input range (IN3)

• ±3.8 ppm of FSR typical INL

• 3.1 ppm/°C max gain error drift

• ± 0.096 maximum device-to-device phase angle mismatch at 20 kHz