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Voltage divider works with high precision

Posted: 16 May 2008     Print Version  Bookmark and Share

Keywords:voltage divider  TCR  PCR 

 Vishay's VFCD1505 Voltage Divider

Vishay Intertechnology Inc. released an ultra-high-precision surface-mount flip-chip voltage divider. The VFCD1505 is built on Vishay's "Z- foil" technology, reducing the resistive component's sensitivity to ambient temperature variations (TCR) and applied power changes (PCR).

The voltage divider also provides a low absolute TCR of ±0.05ppm/°C from 0°C to +60°C and ±0.2ppm/°C from -55°C to +125°C, +25°C Ref. and an excellent PCR tracking of ±5ppm at rated power.

High tolerance
The VFCD1505 provides tight tolerance matching of ±0.01 per cent (available down to ±0.005 per cent) and TCR tracking of 0.1ppm/°C between two resistors simultaneously etched on one piece of foil on a common substrate. For designers, the electrical specifications of this integrated construction offer improved performances and better real estate utilisation over discrete resistors and matched pairs.

The new device has a load-life stability ratio of ±0.005 per cent for 2000 hours at +70°C; a power rating of 0.1W at +70°C (divided between the two resistors proportionally to their value); a low voltage coefficient of <0.1PPM/V; current noise of <-40dB; and thermal EMF of 0.05µV/°C. It offers a fast rise time of 1ns without ringing and features a non-inductive (<0.08µH), non-capacitive design.

The device offers the utmost in ESD immunity, withstanding electrostatic discharges exceeding 25kV, for increased reliability. Within a resistance range of 1K to 10K, any value at any tolerance is available through calibration.

Applications for the VFCD1505 include high-precision instrumentation amplifiers, bridge networks, differential amplifiers, and ratio arms in bridge circuits for ultra-stable and high-reliability products, such as medical, test, and military equipment. Screening in accordance with EEE-INST-002 is available (MIL-PRF 55342).

Samples and production quantities of the VFCD1505 voltage divider are available now, with lead times of 72 hours for samples, and three weeks for standard orders.

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