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Product families made for high-voltage apps

Norwood, Mass. — Analog Devices Inc. introduced its latest data converters, amplifiers, voltage references and a new family of smart sensing devices that were designed to meet the unique signal conditioning requirements of industrial and instrumentation equipment.

By addressing the particular performance needs of high-voltage industrial systems operating in electrically noisy environments, the new data converter, amplifier and voltage reference components — enabled by ADI's patented high-voltage manufacturing processes — feature reduced power consumption, cost and package size to simplify system development and free up board space for the inclusion of new product features, said Dick Meaney, ADI's vice president, precision signal processing group.

The new family of smart sensors, meanwhile, is based on ADI's existing integrated micro electromechanical systems iMEMS technology coupled with a novel, advanced integration technique, Meaney said. “The new sensors deliver breakthrough performance and programmability to simplify the design of factory automation controls, platform monitoring systems and other motion-sensitive industrial tools and machinery,” he said.

Programmable PulSAR analog-to-digital converters:

The new 16-bit AD761x and 18-bit AD763x PulSAR analog-to-digital converters (A/D converters) eliminate the need for expensive level shifting and gain stages in front-end analog circuitry through the innovative addition of software selectable input ranges. By leveraging ADI's patented iCMOS industrial process technology, the new successive-approximation register (SAR) A/D converters allow for the selection of unipolar input voltage ranges of 0 to 5 V and 0 to 10 V, and bipolar input voltage ranges of ±5 V and ±10 V on the fly — with zero data latency. The result is a dramatic reduction in component costs and board space requirements for industrial applications, such as data acquisition and process control systems used in factory automation, Meaney said.

Clocking at speeds up to 750 ksamples/second, devices in the 16-bit AD761x series offer up to a 6-fold improvement in sampling rate performance over existing programmable A/D converters, while the AD763x A/D converters allow more precise signal conversion at 18 bits of resolution, he said. The combination of functionality, performance and a 50 percent smaller footprint available at half the price of competing products is unprecedented in a SAR A/D converter, according to Meaney.

Availability and Pricing

Both the new 16-bit PulSAR A/D converter series (AD7610 and AD7612) and the 18-bit PulSAR A/D converter series (AD7631 and AD7634) are sampling now, with full production slated for December 2005. Both series are available in a 48 lead LQFP and a 48-lead LFCSP.

The 16-bit devices are available at prices starting at $12.90 per unit for the AD7610; and the 18-bit devices are available at prices starting at $25.10 per unit for the AD7631, in 1,000-piece quantities. Click here for the AD7610 data sheet. Click here for the AD7631 data sheet.

JFET-input operational amplifier and voltage references:

The new junction field effect transistor (JFET)-input op amp and a new family of voltage references have been optimized to provide designers of industrial and instrumentation systems extremely high-precision performance, ultra small size and very low power consumption, saving board space and improving circuit layout flexibility at a cost lower than competing devices, Meaney said. Suited for use as a reference buffer, active filter and level shifter, the ADA4000-1 op amp offers the best precision performance of any component in its class, with 80 percent lower input bias current and 50 percent lower offset voltage, he said. Manufactured on ADI's iPolar trench isolation process technology, the ADA4000-1 consumes 75 percent less power and is available in a TSOT-23 package that is 75 percent smaller than the closest competing op amp, Meaney said.

Availability and Pricing

The ADA4000-1 is sampling now and will be available in production quantities in March 2006. Dual and quad versions will be available in the first half of 2006. The ADA4000-1 is fully specified over the extended industrial temperature range of –40°C to +125°C, and is packaged in both a 5-lead TSOT-23 and 8-lead SOIC.

Pricing is 91 cents per unit in 1,000-piece quantities. Click here for the ADA4000-1 data sheet.

The ADR12x family of low-power voltage references combines high precision and low-voltage operation within a TSOT-23 package, making it the practical companion chip for data converters in handheld and battery-powered industrial and medical instrumentation equipment. The devices feature the lowest temperature drift performance (9 ppm/°C) over the extended industrial temperature range (–40°C to +125°C) — a 10 percent improvement over competing devices — and require very little supply current, only 85 μA, for operation. This improvement in precision within a small footprint is optimized by the trimming efficiencies of ADI's iPolar process technology.

Availability and Pricing

The ADR12x family, including the ADR127 (1.25 V), ADR121 (2.5 V) and ADR125 (5.0 V) are sampling now and will be available in full production in January 2006.

Available in 6-lead TSOT-23 packaging, each device is priced at $1.19 per unit in 1,000-piece quantities. Click here for the ADR12x data sheet.

iSensor intelligent sensors:

The flagship of a new sensor product family from ADI, the ADIS16201 iSensor intelligent motion sensor leverages a patent-pending advanced integration process that combines a dual-axis MEMS accelerometer, a digital temperature sensor, power management circuitry and embedded firmware.

This system-in-a-package approach results in a small, cost-effective, easy-to-use sensor solution that provides fully calibrated digital outputs for motion and inclination measurements to make reliable sensing circuitry more accessible and affordable for designers of industrial systems.

The combination of functionality is said to be ideal for industrial applications, such as platform stabilization, machine vibration detection, and motion and positioning measurement. The smart sensors include application-specific programmable power-management options, while a self-calibration feature, combined with multiple, easy-to-use, on-chip programming options and an industry standard serial port interface (SPI), significantly reduces the cost and time associated with system-level sensor integration, Meaney said.

Availability and Pricing

The ADIS16201 iSensor intelligent sensor is available at $28 per unit in 1,000-piece quantities in a laminate-based LGA package and is sampling now, with full production volume slated for March 2006. The ADIS16003 is in full production now and is available at $17.75 per unit in 1,000-piece quantities in a laminate-based LGA package. The ADIS16100 is available at $36.50 per unit in 1,000-piece quantities in a laminate-based LGA package and is sampling now. Click here for the ADIS16201 data sheet.

Analog Devices , 1-800-262-5643, www.Analog.com.

Hammering home its commitment to the high-voltage industrial sector, ADI is rolling out four new product families (A/D converters, intelligent sensors, JFET op amps, and voltage references). Three of the four product families utilize the company's fairly new iCMOS and iPolar manufacturing processes.

ADI is still committed to this market segment, while many other OEMs are focusing on the 3C markets (computer, consumer, communications), said Eric Nolan, ADI's product market manager, precision signal processing.

“If you look at the industrial market, you will see that there haven't been any new high-voltage processes developed in the last five or 10 years. There is plenty of development on the low- voltage side, but not in the high-voltage arena,” Nolan said.

The programmable PulSAR A/D converters utilize ADI's iCMOS process. The references and amplifiers both use ADI's iPolar process, and the iSensor sensors use a combination of many different processes including CMOS, bipolar and iMEMs .

Click here for more details on ADI's iCMOS process .

Click here for more details on ADI's iPolar process .

The 16- (AD761x) and 18-bit (AD763x) A/D converters, the first PulSAR converters ADI is releasing utilizing the iCMOS process, feature ease of use, increased functionality and space savings.

ADI's older PulSAR A/D converters were designed for straight lower voltage input ranges (0 to 5 V typically), versus up to ±10 V for the new devices. “Straight CMOS doesn't have the high-volt capability,” Nolan said.

The best reason to use these converters is their high level of integration (see graphic below) . “To get to the high-volt industrial range (±10 V), ADI integrated information in the front end that is controlled by software. Normally, a programmable gain amplifier is needed in the front of the A/D converter, which is usually fabricated via a bunch of switches and amplifiers to perform the same function. In addition, we've eliminated single-end differential conversion and the need for level shifting,” Nolan said.

 
 
See related A/D converter diagram

The second product family, the precision JFET amplifier (ADA4000-1) is a single version device, with a 36-V supply, low input bias current (10 pA max), high precision (offset voltage of just 1 mV), and tiny package (TSOT23) — all for under a buck. Dual and quad versions will soon follow, Nolan said.

The voltage reference family (ADR12x family) offers low power consumption (only 85 μA,) for operation in a small package (TSOT-23). “It also offers high precision grade, with good output drive capability,” Nolan said. This is ADI's first voltage reference family using the iPolar process.

What makes this voltage reference family, which use a common output voltage (2.5 and 1.25 C) that is used for converters, stand out, is that it offers the best temperature coefficient out there, Nolan said. “Stability over temperature is a critical spec. You want the voltage reference to be as close to the output voltage as possible (5 V over the temperature range),” he said.

The graph below shows very little drift with temperature (9 ppm/°C).

 
 
See related chart

ADI's iSensors are a fully integrated (see graphic below) sensor processing solution for applications that require intelligence embedded within the sensor, said Bob Scannell, ADI's business development manager, iSensors . “There are a lot of advantages of doing it this way. You can pre-calibrate it and get an accurate response by putting conditioning next to the sensor,” he said.

 
 
See iSensor block diagram

Some remote and wireless applications require embedded intelligence. Putting the process at the center of the application reduces the data you transmit back to the controller and consequently uses less power, Scannell said. These are system-in-package solutions, a concept that ADI is patenting, with a digital interface and embedded control. “Complex design requirements at the system level require a high-level system oriented approach, which we've taken,” Scannell said.

The programmability aspect of these sensors is important, according to Scannell. In applications for vibration analysis in heavy industrial equipment like presses and drills, someone typically uses a handheld monitor to sense gross motor changes that may require maintenance. “Customers want to embed the sensor in the equipment close to the motor to provide the same detection from inside the equipment, to avoid downtime,” Scannell explained. “This is a fully integrated accelerometer that also provides an inclinometer function (tilt sensing) with built-in calibration so the customer can update applications in the field,” he added.

The system-in-packaging approach allows integration around the sensor — using the same package size (9mm x 9mm). “It's a 3D approach, where the electronics is mounted under the sensor in a land grid array format package,” Scannell said.

Essentially, ADI is providing programmability and a lot of functionality, for the same price as sensors that would need to have all of this additional functionality added, Scannell said.

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