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, which
include unipolar and bipolar single-ended, pseudo differential, and
differential signals, with a maximum differential range of ±28.672
V and a common-mode voltage range of −16 V to +12 V using
IN3. With the precision of Analog Devices iPASSIVES™ technology,
the ADAQ7767-1 performs with excellent common-mode rejection
ratio (CMRR). The three pairs of pin-selectable gain settings offer
additional system dynamic range and improved signal chain noise
performance with input signals of lower amplitude. In applications
requiring high input impedance, the ADAQ7767-1 allows the customer
to choose their preferred input amplifier.
A fourth-order low-pass analog filter combined with the user-programmable
digital filter ensures that the signal chain is protected
against the high frequency noise and out of band tones presented
at the input node from aliasing back into the band of interest.
The analog low pass filter is carefully designed to achieve high
phase linearity and maximum in-band magnitude response flatness.
Constructed with iPASSIVES technology, the resistor network used
within the analog low-pass filter possess superior resistance matching
in both absolute values and over temperature. As a result, the
signal chain performance is maintained with minimum drift over
temperature, and the ADAQ7767-1 has an excellent device-to-device
phase matching performance.
A high-performance analog-to-digital (ADC) driver amplifier ensures
the 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 differential
architecture 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 performance
and DC precision, and a throughput rate of 1 MSPS from a 16.384
MHz MCLK. The device includes an optional linearity boost buffer
that can further improve the signal chain linearity.
The ADAQ7767-1 is specified with an input reference voltage of
4.096 V, but the device can support reference voltages ranging from
VDD_ADC down to 1 V.
The ADAQ7767-1 has two types of reference buffers: a precharge
reference buffer to ease the reference input driving requirement, or
a full reference buffer to provide a high impedance reference input.
Both buffers are optional and can be turned off through register
configuration.
The ADAQ7767-1 supports three clock input types: crystal, complementary
metal-oxide semiconductor (CMOS), or low voltage
differential signaling (LVDS).
Three types of digital low pass filters are available on the
ADAQ7767-1. 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 filter
has a low latency path with a smooth step response while maintaining
a good level of aliasing rejection. This filter supports an
output data rate up to 1.024 MSPS from a 16.384 MHz MCLK,
making the sinc5 filter ideal for low latency data capturing and
time domain analysis. The sinc3 filter supports a wide decimation
ratio and can produce output data rates down to 50 SPS from a
16.384 MHz controller clock signal (MCLK). This combined with
the simultaneous 50 Hz/60 Hz rejection post filter makes the sinc3
filter especially useful for precision DC measurement. All three
digital filters on the ADAQ7767-1 are FIR filters with linear phase
response. The bandwidth of the filters, which directly corresponds
to the bandwidth of the DAQ signal chain, are fully programmable
through register configuration.
The ADAQ7767-1 supports two device configuration methods. The
user has the option to choose to configure the device via register
write through its serial peripheral interface (SPI) or through a simple
hardware pin strapping method to configure the device to operate
under a number of predefined modes.
A single SPI supports both the register access and the sample data
readback functions. The ADAQ7767-1 always acts as a SPI target.
Multiple interface modes are supported with a minimum of three
input and output channels required to communicate with the device.
The ADAQ7767-1 features a suite of internal diagnostic functions
that can detect a broad range of errors during operation to help
improve system reliability.
The ADAQ7767-1 supply connections can be simplified by using its
internal low dropout (LDO) regulator. Note that, 0.1 μF decoupling
capacitors are also integrated to further reduce the number of
discrete components.
Each functional block of the device can be put into standby mode or
power-down mode, enabling the ADAQ7767-1 to have a total power
consumption 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_BGA
package with 0.8 mm ball pitch, making it suitable for multiple-channel
applications. The footprint of the ADAQ7767-1 is eight times
smaller compared to the footprint of the same solution using discrete
components.
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 Test
Protected by U.S. Patent 10,680,633 B1
Protected by U.S. Patent 10,979,062 B2
