ANALOG ANALOG HIGH AUTO ZERO STATUS STATUS CONVERT OUTPUT ENABLE

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ANALOG ANALOG HIGH AUTO ZERO STATUS STATUS CONVERT OUTPUT ENABLE

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APPLYING ADC100
ANALOG ANALOG HIGH AUTO ZERO STATUS STATUS CONVERT OUTPUT ENABLE
-15V +15V
ADC100
Then convert line pulsed again. this time, middle byte output register ready read. Then convert line pulsed again. This time least significant byte output register ready read, converter initial state ready accept either another conversion auto zero. OUTPUT ENABLE: This line effect converter operation. high without affecting converter. Taking this line activates 8-bit data output bus. Taking this line high puts output tri-state, high impedance mode.
DATA OUTPUT
FIGURE 1.CONNECTIONS POWER SUPPLIES +15, volts required. Connect pins shown connection diagram Fig.1. GROUND There ground (not separate analog digital grounds many converters). This Analog common ground only return line analog input. This will discussed more detail when analog inputs covered. DIGITAL INPUTS While discussing digital connections, references made function table Fig. ADC100 help clarify digital input-output relationships. AUTO ZERO: When being used, this line should high. auto zero, pulse this line (CONVERT must high whenever auto zero activated). CONVERT: When being used, this line should high. start conversion, pulse this line (AUTO ZERO must always high whenever convert active during entire convert process). first pulse convert line starts conversion. After conversion, most significant byte output register ready read.
interfacing, OUTPUT ENABLE will used activate output lines when desired read ADC. applications where connected bus, this line permanently tied low. ANALOG INPUTS ANALOG INPUTS ANALOG COMMON: these lines should obvious. ADC100 only analog input range: -10.48 +10.48. This covers most common likely levels input measurements. These lines used differential type input, differences potential between ANALOG COMMON GROUND over 100mV create increased errors limited common mode rejection. DIGITAL OUTPUTS STATUS LINES: These lines indicate state. both lines high, will accept either type command, CONVERSION AUTO ZERO. both status lines low, command sort should given, this indicates converter process doing conversion. state, only recommended command pulse conversion line. These intermediate read steps. DATA OUTPUTS: 8-bit data bus. Straight-binary logic (high=true). least significant bit, most significant bit.
APN5 NOV.1991
CONDITION
INPUTS CONV.
STATUS
FUNCTION
OUTPUT
IDLE-READY AUTO-ZERO COMPLETE-READY
CONVERSION PROGRESS*
BYTE (MSB) BYTE BYTE (LSB)
CONVERSION COMPLETE READ OUTPUT UPDATE OUTPUT READ OUTPUT UPDATE OUTPUT READ OUTPUT ALLOWED!
DON'T CARE
FIGURE FUNCTION TABLE
APPLICABLE
*When conversion progress (indicated both low) apply other inputs except return convert high state. busy shouldn't bothered. OPERATION ADC100 following discussion typical sequence events when using ADC100. After connecting power supplies inputoutput lines powering ADC100, first event should normally AUTO-ZERO command both initialize autozero. Pulse auto-zero (and only auto zero) then high again. Wait return high. Pulse convert (and only convert) then high again. both take action while both (about msec.). When goes high, will low, conversion complete. Output enable taken will output MSB. Pulse convert then high again. will high, will low, byte ready. Output enable taken will output byte. Pulse convert then high again. will both high, ready. Output enable taken will output LSB. initial state.
FIGURE TYPICAL OPERATION TIMING DIAGRAM. ADC100 DATA SHEET DETAILED TIMING INFORMATION
APN5 NOV.1991
(While steps specifically shown taking OUTPUT ENABLE low, connected does need tri-state output capability, then output enable permanently tied low. Data will always coming ADC, only guaranteed valid after conversion. MOST COMMON PROBLEMS OBSERVED ADC100. Taking both convert auto-zero same time. Noise convert auto-zero causing false triggering. volt power supplies must free high frequency noise DC-DC converter supplies used, adequate high-frequency filtering must provided.

ANALOG ANALOG HIGH AUTO ZERO STATUS STATUS CONVERT OUTPUT ENABLE

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