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'''OPA''' - Operational Amplifiers for hardware developers and manufacturing When RCal is hardware processed (not software configured) we consider using a lower offset OPA than LM324D (although we could calibrate and compansate in software). I'm a bit confused, which is the order of preference for OPA now? Please review * LT1882 ? best * texas type OPA4277UA or lettle brother good * texas type y ? still OK * LM324D last chance (needs offset calibration at 2 temps) '''We selected the 277 series from Texas.''' Try to use it for pump and sensitive stuff (such as precise input mA diffamp) only. * OPA2277 has 2 OPA-s in 8 pin SOIC while * OPA4277UA has 4 OPA in 14 pin SOIC (LM324D pin compatible drop in replacement). Available in a week, a bit expensive though, costs more than 2 x atmega88-20 MHz * [http://www-s.ti.com/sc/ds/opa4277.pdf OPA4277.pdf] page 6: rail-2-rail properties are OK. +0.6V and Vss-1V at 5mA. ---- '''Dropped:''' * [http://focus.ti.com/docs/prod/folders/print/opa227.html OPA2228] (texas) series 75uV offset, not rail2rail but it might work. * LT1882 or LT1885 nice parts but where to get? Our distributor does not have any. linear.com has some webshop, that might work NOTE - GrmRacer I have a local field engineers card. He delivered my samples to the front door. Should I contact? I think so, it's a good competitor to the texas OPA4277UA. Best would be to get the distributor address in Hungary, Europe. '''Linear distributors for Hungary:''' Linear Technology Direct Sales Office Oskar-Messter-Str. 24 D-85737 Ismaning Germany Tel: 49-89-9624550 Fax: 49-89-963147 LTC Distributor ChipCad Ltd. (A Partner of Memec) Kiss Erno u.3 H 1046 Budapest Tel: 0036-1-2317000 Fax: 0036-1-2317011 LTC Distributor Setron Magyarorszag Kft. Kavics u.3 fsz.1 H-1025 Budapest Tel: 361-345-0331 Fax: 361-326-1565 ---- '''MCP3208 serial ADC (SAR) substitute''' * [http://focus.ti.com/docs/prod/folders/print/tlc1543.html TCL1543] 11 channels, 10 bit ADC with good cost and temperature range (whenever 8 of the MCP3208 is on the low side), the DB20 package is nice small footprint. ---- '''See also''' * VemsFrontier/ArmEfi,
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