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ADS7816UBG4 Arkusz danych(PDF) 10 Page - Texas Instruments

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Numer części ADS7816UBG4
Szczegółowy opis  12-Bit High Speed Micro Power Sampling ANALOG-TO-DIGITAL CONVERTER
Download  24 Pages
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI - Texas Instruments

ADS7816UBG4 Arkusz danych(HTML) 10 Page - Texas Instruments

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10
®
ADS7816
D
OUT
1.4V
Test Point
3k
100pF
C
LOAD
t
r
D
OUT
V
OH
V
OL
t
f
t
dDO
t
hDO
D
OUT
DCLOCK
V
OH
V
OL
V
IL
D
OUT
Test Point
t
dis Waveform 2, ten
t
dis Waveform 1
100pF
C
LOAD
3k
t
dis
CS/SHDN
DOUT
Waveform 1(1)
DOUT
Waveform 2(2)
90%
10%
V
IH
1
B11
2
t
en
CS/SHDN
DCLOCK
V
OL
D
OUT
V
CC
Load Circuit for tdDO, tr, and tf
Voltage Waveforms for DOUT Rise and Fall TImes tr, and tf
Voltage Waveforms for DOUT Delay Times, tdDO
Load Circuit for tdis and tden
Voltage Waveforms for ten
FIGURE 2. Timing Diagrams and Test Circuits for the Parameters in Table I.
Voltage Waveforms for tdis
DESCRIPTION
ANALOG VALUE
Full Scale Range
VREF
Least Significant
VREF/4096
Bit (LSB)
Full Scale
VREF –1 LSB
1111 1111 1111
FFF
Midscale
VREF/2
1000 0000 0000
800
Midscale – 1 LSB
VREF/2 – 1 LSB
0111 1111 1111
7FF
Zero
0V
0000 0000 0000
000
Table II. Ideal Input Voltages and Output Codes.
DIGITAL OUTPUT:
STRAIGHT BINARY
BINARY CODE
HEX CODE
NOTES: (1) Waveform 1 is for an output with internal conditions such that
the output is HIGH unless disabled by the output control. (2) Waveform 2
is for an output with internal conditions such that the output is LOW unless
disabled by the output control.
DATA FORMAT
The output data from the ADS7816 is in Straight Binary
format as shown in Table II. This table represents the ideal
output code for the given input voltage and does not include
the effects of offset, gain error, or noise.
POWER DISSIPATION
The architecture of the converter, the semiconductor fabrica-
tion process, and a careful design allow the ADS7816 to
convert at up to a 200kHz rate while requiring very little
power. Still, for the absolute lowest power dissipation, there
are several things to keep in mind.
The power dissipation of the ADS7816 scales directly with
conversion rate. The first step to achieving the lowest power
dissipation is to find the lowest conversion rate that will
satisfy the requirements of the system.
In addition, the ADS7816 is in power down mode under two
conditions: when the conversion is complete and whenever
CS is HIGH (see Figure 1). Ideally, each conversion should
occur as quickly as possible, preferably, at a 3.2MHz clock
rate. This way, the converter spends the longest possible
time in the power down mode. This is very important as the


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