First zero-drift programmable instrumentation amplifier with diagnostics
Offered as the first zero-drift programmable instrumentation amplifier with on-chip diagnostics, the LMP8358 simplifies pressure and thermocouple bridge measurements by allowing users to detect shorts, open circuits, and degraded source connections in remote industrial applications. The device uses patented techniques to measure and continuously correct its input offset voltage (5 µV typ), eliminating offset drift over time and temperature, as well as the effect of 1/f noise — leading to a flat noise spectrum of 27 nV/√Hz.
The device’s programmable frequency compensation enables programmable bandwidths, and its offset compensation circuit does not introduce distortion and aliasing for signals lower than 12 kHz of bandwidth. The LMP8358 also provides glitch-free transitions between gain settings, which can be programmed to 10, 20, 50, 100, 200, 500, or 1,000 through a serial peripheral interface (SPI) or parallel interface.
Additional features include onchip EMI suppression filters, a gain bandwidth of 8 MHz, a current consumption of 1.7 mA, a current consumtpion in shutdown at less than 1 µA, and a maximum offset voltage drift of 50 nV/°C. The amp’s ground-sensing CMOS input provides a high CMRR of 120 dB. Supplied in 14-pin SOIC and 14-pin TSSOP packages, the LMP8358 operates from a single 2.7 to 5-V supply and over a wide temperature range of –40° to 125°C. ($2.71 ea/1,000 — available now.)
National Semiconductor , Santa Clara , CA
Sales 800-272-9959
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