Protocol Analyzers

The ADuM4165/ADuM4166¹ are USB 2.0 port isolators, utilizing Analog Devices, Inc., iCoupler^® technology to dynamically support all USB 2.0 data rates; low (1.5 Mbps), full (12 Mbps), or high (480 Mbps), as required. The devices support host isolation with automatic speed negotiation as well as peripheral isolation.

High speed data is retimed for jitter reduction, requiring an external clock signal or crystal input. The ADuM4165 supports the clock or crystal input on the upstream side, and the ADuM4166 supports the clock or crystal input on the downstream side, offering two options to best suit the system design.

The low power standby mode for downstream (Side 2) supports applications with limited available power, such as battery-operated peripherals. The upstream (Side 1) standby current meets USB 2.0 requirements for suspended operation.

The isolators are specified over an extended industrial temperature range of −55°C to +125°C and are available in a 20-lead, wide-body, increased creepage SOIC_IC with 8.3 mm creepage and clearance.

APPLICATIONS

• USB peripheral, USB host, and USB hub isolation
• Electronic test and measurement equipment
• Medical devices and integrated PCs
• Industrial PCs and isolated USB ports for debug or upgrade
• USB isolator modules and USB cable isolators

¹ Protected by U.S. Patents 7,075,329; 8,432,182; 8,525,547; and 8,564,327. Other patents are pending.

The ADuM4165/ADuM4166 are USB 2.0 port isolators, utilizing Analog Devices, Inc., iCoupler^® technology to dynamically support all USB 2.0 data rates; low (1.5 Mbps), full (12 Mbps), or high (480 Mbps), as required. The devices support host isolation with automatic speed negotiation as well as peripheral isolation.

High speed data is retimed for jitter reduction, requiring an external clock signal or crystal input. The ADuM4165 supports the clock or crystal input on the upstream side, and the ADuM4166 supports the clock or crystal input on the downstream side, offering two options to best suit the system design.

The low power standby mode for downstream (Side 2) supports applications with limited available power, such as battery-operated peripherals. The upstream (Side 1) standby current meets USB 2.0 requirements for suspended operation.

The isolators are specified over an extended industrial temperature range of −55°C to +125°C and are available in a 20-lead, wide-body, increased creepage SOIC_IC with 8.3 mm creepage and clearance.

APPLICATIONS

• USB peripheral, USB host, and USB hub isolation
• Electronic test and measurement equipment
• Medical devices and integrated PCs
• Industrial PCs and isolated USB ports for debug or upgrade
• USB isolator modules and USB cable isolators

Protected by U.S. Patents 7,075,329; 8,432,182; 8,525,547; and 8,564,327. Other patents are pending.

The AD4116 is a low power, low noise, 24-bit, Σ-Δ analog-to-digital converter (ADC) that integrates an analog front end (AFE) for six fully differential or eleven single-ended, high impedance (≥10 MΩ) bipolar, ±10 V voltage inputs. The additional two differential or four single-ended/pseudo differential direct ADC inputs provides excellent performance at lower input ranges.

The AD4116 also integrates key analog and digital signal conditioning blocks to configure eight individual setups for each analog input channel in use. As many as 16 channels can be enabled at any time. A channel is defined as any of the standard analog voltage inputs or a low level direct ADC input. The AD4116 features a maximum channel scan rate of 12,422 SPS (80 μs) using a sinc5 + sinc1 filter and 20,618 SPS per channel (48 μs) using a sinc3 filter.

The embedded 2.5 V, low drift (5 ppm/°C), band gap internal reference (with output reference buffer) reduces the external component count.

The digital filter allows flexible settings, including simultaneous 50 Hz and 60 Hz rejection at a 27.27 SPS output data rate. The user can select between the different filter settings depending on the demands of each channel in the application. The automatic channel sequencer enables the ADC to switch through each enabled channel.

The precision performance of the AD4116 is achieved by integrating the proprietary iPassives^® technology from Analog Devices, Inc.

The AD4116 operates with a single power supply, making it easy to use in galvanically isolated applications. The specified operating temperature range is −40°C to +105°C. The AD4116 is housed in a 40-lead, 6 mm × 6 mm LFCSP.

APPLICATIONS

• Process control
• PLC and DCS modules
• Instrumentation and measurement

Universal serial bus (USB) has been established as the standard interface for most computer peripherals. It has mostly displaced RS-232 and the parallel printer port because of superior speed, flexibility, and support of device hot swapping. There has been a strong desire on the part of industrial and medical equipment manufacturers to use the USB standard as well. However, adoption has been slow because there has not been a good way to provide the required isolation for safe and robust connections to machines that control dangerous voltages or low leakage, defibrillation proof connections in medical applications.  

EVAL-CN0419-EBZ galvanically isolates a peripheral device that implements a USB interface and is bus powered with a small isolated dc-to-dc converter based on Analog Devices, Inc., iCoupler^® technology. The application circuit shown in Figure 1 is typically necessary for many medical and industrial applications. This circuit provides the following features:

1. Directly isolates, in the upstream, the USB D+ and D− lines of a cable.
2. Implements an automatic scheme for data flow that does not require external control lines.
3. Provides medical grade isolation.
4. Allow a complete peripheral to meet the USB-IF certification standards.
5. Support full speed (12 Mbps) and low speed (1.5 Mbps) signaling rates.
6. Provides up to 92 mA isolated power for the attached peripheral.

Controller area network with flexible data rate (CAN FD) allows higher bandwidth communications demanded by multinode networks in industrial automation, HVAC, agriculture, and healthcare applications. The circuit shown in Figure 1 enables CAN FD bus connectivity data rates up to 8 Mbps on an Arduino Uno form factor platform by connecting with an existing serial peripheral interface (SPI) bus. 

The CAN FD transceiver has integrated signal and power reinforced isolation. The integrated isolated dc-to-dc converter draws power from the logic side to provide power to the bus side isolation channels and transceiver, and thus requires no external power on the CAN FD bus. 

The isolated transceiver has exceptional EMC robustness. An extended common-mode range of ±25 V exceeds the ISO11898-2:2016 requirement and offers a high tolerance to localized ground potential differences when receiving CAN frames. Integrated ESD protection offers IEC 61000-4-2 ESD protection on the CANH and CANL bus pins. The differential bus pins can withstand miswires and shorts to 24 V systems with ±40 V fault protection on the CANH and CANL pins. 

The CAN bus may connect two or hundreds of nodes. The connections may be made with different cable types, depending on application requirements. Cables may range from lower cost unshielded twisted pair like Cat5e cable to higher quality shielded cable like PROFIBUS cable. With any cable type, the ideal CAN bus daisy chains one node to the next and has terminations at both ends. Connections to the bus may be made either by screw terminal or the CAN CiA 303-1 male, 9-pin, sub-D port.

To implement the end of bus terminations, the circuit uses an integrated auxiliary isolated digital channel for runtime configuration of the bus termination. The switchable termination circuitry connects a 120 Ω split termination with commonmode filtering capacitor between the CAN bus lines. Switchable termination allows software configuration of termination locations when the CAN bus is changed. Using switchable termination, each board can be used for any node along the signal path simply by modifying the software. 

Additionally, the circuit can be configured at runtime via software to enter a reduced power standby mode. In this state, the isolated CAN FD transceiver responds only on receipt of the ISO11898-2:2016 defined remote wake-up sequence from a remote node.