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ADC0817CCN Scheda tecnica(PDF) 7 Page - Texas Instruments

Il numero della parte ADC0817CCN
Spiegazioni elettronici  ADC0816/ADC0817 8-Bit 關P Compatible A/D Converters with16-Channel Multiplexer
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ADC0816, ADC0817
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SNAS527C – JUNE 1999 – REVISED MARCH 2013
Additional single-ended analog signals can be multiplexed to the A/D converter by disabling all the multiplexer
inputs using the expansion control. The additional external signals are connected to the comparator input and the
device ground. Additional signal conditioning (i.e., prescaling, sample and hold, instrumentation amplification,
etc.) may also be added between the analog input signal and the comparator input.
CONVERTER CHARACTERISTICS
The Converter
The heart of this single chip data acquisition system is its8-bit analog-to-digital converter. The converter is
designed to give fast, accurate, and repeatable conversions over a wide range of temperatures. The converter is
partitioned into 3 major sections: the 256R ladder network, the successive approximation register, and the
comparator. The converter's digital outputs are positive true.
The 256R ladder network approach Figure 1 was chosen over the conventional R/2R ladder because of its
inherent monotonicity, which specifies no missing digital codes. Monotonicity is particularly important in closed
loop feedback control systems. A non-monotonic relationship can cause oscillations that will be catastrophic for
the system. Additionally, the 256R network does not cause load variations on the reference voltage.
The bottom resistor and the top resistor of the ladder networking Figure 1 are not the same value as the
remainder of the network. The difference in these resistors causes the output characteristic to be symmetrical
with the zero and full-scale points of the transfer curve. The first output transition occurs when the analog signal
has reached + ½ LSB and succeeding output transitions occur every 1 LSB later up to full-scale.
Figure 1. Resistor Ladder and Switch Tree
Figure 2. 3-Bit A/D Transfer Curve
Figure 3. 3-Bit A/D Absolute Accuracy Curve
Copyright © 1999–2013, Texas Instruments Incorporated
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