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ADC10064CIWM датащи(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали ADC10064CIWM
подробное описание детали  10-Bit 600 ns A/D Converter with Input Multiplexer and Sample/Hold
PDF  14 Pages
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC10064CIWM датащи(HTML) 8 Page - National Semiconductor (TI)

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Timing Diagrams
Functional Description
The ADC10061, ADC10062 and ADC10064 digitize an ana-
log input signal to 10 bits accuracy by performing two
lower-resolution “flash” conversions. The first flash conver-
sion provides the six most significant bits (MSBs) of data,
and the second flash conversion provides the four least sig-
nificant bits LSBs).
Figure 3 is a simplified block diagram of the converter. Near
the center of the diagram is a string of resistors. At the bot-
tom of the string of resistors are 16 resistors, each of which
has a value 1/1024 the resistance of the whole resistor
string. These lower 16 resistors (the LSB Ladder ) therefore
have a voltage drop of 16/1024, or 1/64 of the total reference
voltage (V
REF+ −VREF−) across them. The remainder of the
resistor string is made up of eight groups of eight resistors
connected in series. These comprise the MSB Ladder. Each
section of the MSB Ladder has 1⁄8 of the total reference volt-
age across it, and each of the LSB resistors has 1/64 of the
DS011020-9
FIGURE 1. Mode 1. The conversion time (t
CONV) is set by the internal timer.
DS011020-10
FIGURE 2. Mode 2 (RD Mode). The conversion time (t
CRD) includes the
sampling time and is determined by the internal timer.
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