Datasheet AD7822, AD7825, AD7829 (Analog Devices) - 9

AD7822/AD7825/AD7829 Gain Error
It also applies to situations where a change in the selected input The deviation of the last code transition (1111 . 110) to channel takes place or where there is a step input change on the (1111 . 111) from the ideal, that is, V input voltage applied to the selected VIN input of the AD7822/ REF − 1 LSB, after the offset error has been adjusted out. AD7825/AD7829. It means that the user must wait for the duration of the track-and-hold acquisition time after a channel
Gain Error Match
change/step input change to VIN before starting another The difference in gain error between any two channels. conversion, to ensure that the part operates to specification.
Track-and-Hold Acquisition Time PSR (Power Supply Rejection)
The time required for the output of the track-and-hold amplifier to Variations in power supply affect the full-scale transition but reach its final value, within ±1/2 LSB, after the point at which the not the converter linearity. Power supply rejection is the track-and-hold returns to track mode. This happens approximately maximum change in the full-scale transition point due to a 120 ns after the falling edge of CONVST. change in power supply voltage from the nominal value. Rev. C | Page 9 of 28 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS TIMING DIAGRAM ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TERMINOLOGY CIRCUIT INFORMATION CIRCUIT DESCRIPTION TYPICAL CONNECTION DIAGRAM ADC TRANSFER FUNCTION ANALOG INPUT POWER-UP TIMES POWER VS. THROUGHPUT OPERATING MODES PARALLEL INTERFACE MICROPROCESSOR INTERFACING AD7822/AD7825/AD7829 TO 8051 AD7822/AD7825/AD7829 TO PIC16C6x/PIC16C7x AD7822/AD7825/AD7829 TO ADSP-21xx INTERFACING MULTIPLEXER ADDRESS INPUTS AD7822 STANDALONE OPERATION OUTLINE DIMENSIONS ORDERING GUIDE