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[原创] ADI ADuM7701 16位二阶Sigma-Delta(∑-Δ)调制器解决方案

关键词:Sigma-Delta(∑-Δ)调制器 ADC 马达控制器 ADuM7701

时间:2019-07-23 10:59:59       来源:中电网

ADI公司的ADuM7701是高性能16位二阶Sigma-Delta(∑-Δ)调制器,能把模拟输入芯信号转换成高速单位数据流,器件集成了基于ADI公司的iCoupler®技术大数字隔离器.器件工作电压4.5V-5.5V,接收假差分输入信号±250 mV (±320 mV满刻度).模拟输入信号连续由高性能模拟调制器取样,转换成数据速率高达21MHz的一密度数字输出流,而原信息则由合适的sinc3数字滤波器重构成86dB SNR的信号(取样78.1 kSPS,256抽取率和20MHz主时钟),串行接口是数字隔离的.工作温度−40℃到+125℃.主要用在分流电流监测,AC马达控制,电源和太阳能逆变器,风能逆变器,以及模拟/数字转换和光耦器件替代品.本文介绍了ADuM7701主要特性,功能框图,典型应用电路图,典型应用电路图,以及评估板EV-ADuM7701-8FMCZ主要特性,框图,电路图和PCB设计图.

The ADuM7701 is a high performance, second-order, Σ-Δ modulator that converts an analog input signal into a high speed, single-bit data stream, with on-chip digital isolation based on Analog Devices, Inc., iCoupler® technology. The device operates from a 4.5 V to 5.5 V power supply range (VDD1) and accepts a pseudo differential input signal of ±250 mV (±320 mV full-scale). The pseudo differential input is ideally suited to shunt voltage monitoring in high voltage applications where galvanic isolation is required. The analog input is continuously sampled by a high performance analog modulator and converted to a ones density digital output stream with a data rate of up to 21 MHz. The original information can be reconstructed with an appropriate sinc3 digital filter to achieve an 86 dB signal-to-noise ratio (SNR) at 78.1 kSPS with a 256 decimation rate and a 20 MHz master clock. The serial input and output operates from a 5 V or a 3 V supply (VDD2). The serial interface is digitally isolated. High speed complementary metal-oxide semiconductor (CMOS) technology, combined with monolithic transformer technology, results in the on-chip isolation providing outstanding performance characteristics, superior to alternatives such as optocoupler devices. The ADuM7701 device is available in both a 16-lead and an 8-lead wide-body SOIC and has an operating temperature range of −40℃ to +125℃ .

ADuM7701主要特性:

5 MHz to 21 MHz master clock input frequency
Offset drift vs. temperature: ±0.6 μV/℃ maximum
SNR: 86 dB typical 16 bits, no missing codes
Full-scale analog input voltage range: ±320 mV
ENOB: 14 bits typical IDD1: 10 mA maximum
On-board digital isolator
Operating temperature range: −40℃ to +125℃
High common-mode transient immunity: 150 kV/μs minimum, VDD2 = 3.3 V
Wide-body SOICs
16-lead SOIC_W
8-lead SOIC_IC with increased creepage
Safety and regulatory approvals (pending)
UL recognition 5700 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice 5A
VDE Certificate of Conformity
DIN V VDE V 0884-10: VIORM = 1270 VPEAK
DIN V VDE V 0884-11: VIORM = 1060 VPEAK

ADuM7701应用:

Shunt current monitoring
AC motor controls
Power and solar inverters
Wind turbine inverters
Analog-to-digital and optoisolator replacement

图1.ADuM7701功能框图

图2. ADuM7701典型应用电路图

评估板EV-ADuM7701-8FMCZ

The EV-ADuM7701-8FMCZ is a fully featured evaluation board that allows the user to evaluate all features of the ADuM7701 isolated analog-to-digital converter (ADC). The EVAL-SDP-CH1Z system demonstration platform high speed (SDP-H1) controller board controls the EV-ADuM7701-8FMCZ evaluation board via the J9 connector, and through the USB port of a PC using the Analysis Control Evaluation (ACE) software. The ACE software is available for download on the ACE software page. On-board components include an isolated, 5 kV, isoPower dc-to-dc converter (the ADuM6000), a 50 mA, 60 V, high efficiency buck regulator (the ADP2360ACPZ-5.0), and a 5 V, low noise, low dropout (LDO) regulator (the ADP7104ARDZ-5.0). This user guide explains how to use the EV-ADuM7701- 8FMCZ evaluation board to evaluate the ADuM7701. The ADuM7701 is a high performance, second-order, Σ-Δ modulator that converts an analog input signal into a high speed, single-bit data stream with on-chip digital isolation based on Analog Devices, Inc., iCoupler technology. The device is powered by a 4.5 V to 5.5 V power supply (VDD1) and accepts a pseudo differential input signal of up to ±250 mV (±320 mV at full scale). The pseudo differential input shunts voltage monitoring in high voltage applications where galvanic isolation is required. The analog input is continuously sampled by a high performance analog modulator, and converts to a ones density digital output stream with a data rate of up to 21 MHz. The original information can be reconstructed with the appropriate digital filter to achieve an 86 dB signal-to-noise ratio (SNR) at 78.1 kSPS with a 20 MHz master clock (MCLK) for the ADuM7701. The serial input/output is powered by a supply of either 5 V or 3.3 V (VDD2). The serial interface is digitally isolated. The on-chip isolation provides performance characteristics superior to alternatives such as optocoupler devices due to high speed complementary metal-oxide semiconductor (CMOS) technology combined with monolithic transformer technology. The ADuM7701 comes in both 16-lead and 8-lead, wide-body SOIC packages, and has an operating temperature range of −40℃ to +125℃. Complete specifications for the ADuM7701 are provided in the ADuM7701 data sheet and must be consulted in conjunction with this user guide when using the evaluation board. Full details on the EVAL-SDP-CH1Z board are available on the SDP-H1 product page.

评估板EV-ADuM7701-8FMCZ主要特性:

Fully featured evaluation board for the ADuM7701
On-board power supplies
Standalone capability
SDP-H1 controller board compatible
PC-based software for control and data analysis
EVALUATION KIT CONTENTS
EV-ADuM7701-8FMCZ evaluation board
ACE software download instructions

图3.评估板EV-ADuM7701-8FMCZ连接图

图4.评估板EV-ADuM7701-8FMCZ框图

图5.评估板EV-ADuM7701-8FMCZ(左)和EVAL-SDP-CH1Z板(右)连接图

图6.评估板EV-ADuM7701-8FMCZ电路图(1)

图7.评估板EV-ADuM7701-8FMCZ电路图(2)

图8.评估板EV-ADuM7701-8FMCZ PCB设计图(1)

图9.评估板EV-ADuM7701-8FMCZ PCB设计图(2)

图10.评估板EV-ADuM7701-8FMCZ PCB设计图(3)

图11.评估板EV-ADuM7701-8FMCZ PCB设计图(4)

图12.评估板EV-ADuM7701-8FMCZ PCB设计图(5)

图13.评估板EV-ADuM7701-8FMCZ PCB设计图(6)

图14.评估板EV-ADuM7701-8FMCZ PCB设计图(7)

图15.评估板EV-ADuM7701-8FMCZ PCB设计图(8)
详情请见:
https://www.analog.com/media/en/technical-documentation/data-sheets/ADuM7701.pdf
https://www.analog.com/media/en/technical-documentation/user-guides/EV-ADuM7701-8FMCZ-UG-1525.pdf
ADuM7701.pdf
EV-ADuM7701-8FMCZ-UG-1525.pdf

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