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Summary of change:
'''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). '''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 * [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? ---- '''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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