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This article introduces the ADAQ23875, an A/D converter for high-precision analog circuits that uses Analog Devices' iPassives® technology.
Recently, analog circuit devices have been simplifying their circuits by incorporating peripheral passive elements inside. This is expected to reduce component costs, management costs, and design man-hours.
Although these advantages are significant, the greatest is in fact the technical advantage. Specifically, by incorporating high-voltage passive components, which are difficult to incorporate, into the IC, the wiring on the PCB, which reduces noise, is reduced, and stable analog signal quality is maintained.
This means that analog ICs using Analog Devices' iPassives® technology can play an important role in the development of systems capable of small, high-precision measurement, which meets market trends.
iPassives® technology for miniaturization
A major feature of Analog Devices' products is that their proprietary process technology, iPassives® technology, makes it possible to integrate not only passive R, L, and C components, but also transformer Schottky diodes (withstand voltage of 200V or more), overvoltage protection, and ESD protection elements into a small package.
The difference with passive elements used in general integrated semiconductors is that all components in the circuit are manufactured simultaneously under the same conditions, making it possible to achieve high-precision matching. For example, when an OP amplifier circuit is manufactured using iPassives® technology, high performance can be achieved, with a Gain error of 0.005%FS or less and a Gain error drift of ±1 ppm/°C or less. In addition, because the absolute accuracy is high, it is also possible to integrate high-precision analog filter circuits, where the time constant is important.
iPassives® technology enables very high accuracy without adjustment, eliminating the need for external and software trimming.
For example, the initial performance of the ADAQ28375 with no adjustment, no trim, and no calibration is:
|
Gain error |
50 ppm・FS |
|
Gain error drift |
0.05 ppm/°C |
|
offset error |
1.5mV max. |
|
offset error drift |
0.25 ppm/°C |
Table 1: Gain error and offset error
The initial error is small, and the input range and resolution that are sacrificed during software calibration are suppressed. The Anti-Aliasing Filter (AAF) circuit between the A/D converter and amplifier allows for a highly accurate and long-term stable circuit configuration.
Precision A/D converter ADAQ23875
The ADAQ23875 is a precision, high speed μModule® data acquisition solution based around a 16-bit, 15 MSPS successive-approximation register (SAR) analog-to-digital converter.
It uses Analog Devices' iPassives® technology, which integrates passive components with excellent matching and drift characteristics to minimize temperature dependent errors and ensure optimal performance.
Its functions and performance features are as follows:
ADAQ23875 Key Features/Overview
■ 16-bit, 15 MSPS data acquisition solution
■ Built-in high-precision analog signal scaling circuit
■ Wide operating input voltage range (-1~+4V) and high CMRR of 96dB
■ Reduced footprint to about 25% compared to discrete components configuration
■ AC Performance TDH : -115dB@1KHz / -90dB@1MHz
SNR: 88.5dB@100KHz
■ DC special INL : ±0.6LSB [Typ.]
DNL: ±0.25LSB [Typ.]
Gain error : 0.005%FS [Typ.]
Gain error drift : ±1ppm/℃ [Max.]
■ Transient response : 52ns (Full-Scale step)
■ Power consumption: 143mW@15MSPS
■ I/F : Serial LVDS
■ Operating temperature range : -40 ~ +85℃
■ Package : 9mmx 9mm , 0.8mm pitch 100-Ball CSP BGA
ADAQ23875 Design/Development Tools
As a document, we have prepared a data sheet, as well as the following information.
・ Ingredient analysis table
・ Reliability data
・ Footprint/symbol data for CAD
We also provide design support such as evaluation boards and control software. / The tools necessary for development are prepared.
・ EVAL-ADAQ23875FMCZ (evaluation board)
・ EVAL-SDP-CH1Z (evaluation board controller board: required for evaluation board control)
・ Evaluation Set User Guide (UG1896)
・ Analysis Control Evaluation (ACE) Software
About the ADAQ series
Analog Devices' high-resolution, high-precision data acquisition system ICs include several products using iPassives® technology. The ADAQ23875 is a SiP with a relatively high-speed, high-resolution successive approximation ADC core developed for industrial use. The product series using iPassives® technology includes the ADAQ798X and ADAQ40XX series. The main difference is the conversion throughput. The general characteristics of each are as follows:
■ ADAQ238XX: High-speed (over 10 MSPS) 16/18-bit ADC core, capturing high-speed signals
■ ADAQ40XX: Medium speed (2MSPS) 16/18/20-bit ADC core, ultra-high accuracy
■ ADAQ798X: Low-speed (1 MSPS) 16-bit ADC core, general-purpose/low-cost
The ADAQ7768, which is in the same ADAQ series, has a slightly different circuit configuration from the other models. It is a system IC with a 24-bit sigma-delta AD converter at its core. It is a digitally rich element, and post-processing such as digital filters is programmable. iPassives® technology is used on the analog input side, and an Anti-Aliasing Filter (AAF) and variable gain block are configured. The data rate is as high as 256kSPS, and combined with the internal linear phase response filter, it is suitable for wide dynamic range AC signal analysis.
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