HomeIndustry news Bias Generation and Level Setting Made Easy

Bias Generation and Level Setting Made Easy

February 27, 2015 By admin Comments are Off , , , ,

Analog Devices, Inc. today introduced a single-chip, universal output D/A converter which combines a 16-bit data converter, ±2 ppm / degree C, 2.5-V reference, output buffer and gain scaling function on-chip. The innovative feature set of the AD5761R converter removes the need for external components, including gain setting precision resisters and amplifiers. In data acquisition and actuator control applications, this quickens and simplifies system design, enabling both unipolar and bipolar operation, through a software register update. Without affecting system design effort, cost or size, the new, flexible D/A converter facilitates design reuse across multi-functional end-equipment, while also enabling enhanced system functionality through the multiple output voltage ranges.

Additionally, ADI announced two dual dc-dc regulators that power the new D/A converter with two independently regulated positive and negative rails for power sensitive applications. This simple two-chip solution enables users to generate bipolar 10-V outputs from only a single, low-voltage positive supply rail, which greatly simplifies system design and removes the need for routing multiple high-voltage rails.

Offering a 60 percent space savings over previous discrete solutions, the AD5761R’s single-chip 3-mm × 3-mm LFCSP standard package is aimed for designs within shrinking form factors, such as actuator control. The total unadjusted error specification — ± 0.15% FSR maximum — is a true error including all on-chip circuitry and reference. This enables more accurate end systems and eliminates multiple system calibration routines in industrial environments. For a lower cost, less accurate option within the same series, a pin compatible 12-bit version and non-reference options are also available.

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AD5761R Key Specifications: 8 software-programmable output ranges with 5% over-range: 0 V to 5 V, 0 V to 10 V, 0 V to 16 V, 0 V to 20 V, ±3 V, ±5 V, ±10 V, and −2.5 V to +7.5 V; Robust feature set including diagnostic, temperature, brownout and short circuit alert; And all devices feature an operating temperature range of -40 to +125 degrees C.

All these new devices are available for immediate shipment. Packaging and pricing (in lots of 1000) are as follows: D5761R , 16-bit with reference on-chip in a 16-lead TSSOP or 16-lead LFCSP, $4.85; AD5721R, 12-bit with reference on-chip, in a 16-lead TSSOP or 16-lead LFCSP, $2.75; AD5761, 16-bit, in a 16-lead TSSOP or 16-lead LFCSP, $4.00; AD5721, 12-bit in a 16-lead TSSOP or 16-lead LFCSP, $2.15; ADP5070, 1.0A Boost Switch and 0.6A Inverter Switch in a 20-lead LFCSP, $2.19; and the ADP5071, 2.0A Boost Switch and 1.2A Inverter Switch in a 20-lead LFCSP, $2.39.

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Complementary low-noise reference products for the AD5761R include the ADR4525 and other products comprising the ADR45XX family. Complementary low-noise positive LDOs include the ADM7160 for 5-V systems, the ADP7118 for 12-V systems and the ADP7142 for 24-V systems. The ADP7182 is a complementary low-noise negative LDO for 5-V, 12-V and 24-V systems.

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