ADC0804LCWM datasheet(32/56 Pages) TI1

32 / 56 page

ADC0801, ADC0802, ADC0803, ADC0804, ADC0805

SNOSBI1C – NOVEMBER 2009 – REVISED JUNE 2015

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Figure 41. Sample Program for Figure 40 Interfacing Multiple ADC’s in an MC6800 System

Figure 42. Sample Program for Figure 40 Interfacing Multiple ADC’s in an MC6800 System

Note: In order for the microprocessor to service subroutines and interrupts, the stack pointer must be

dimensioned in the user’s program.

For amplification of DC input signals, a major system error is the input offset voltage of the amplifiers used for

the preamp. Figure 43 is a gain of 100 differential preamp whose offset voltage errors will be cancelled by a

zeroing subroutine which is performed by the INS8080A microprocessor system. The total allowable input offset

voltage error for this preamp is only 50 µV for /

⁄4 LSB error. This would obviously require very precise amplifiers.

The expression for the differential output voltage of the preamp is:

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ADC0804LCWM Datasheet(PDF) 32 Page - Texas Instruments