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ADS7800JUE4 Arkusz danych(PDF) 9 Page - Texas Instruments

Numer części ADS7800JUE4
Szczegółowy opis  ANALOG-TO-DIGITAL CONVERTER
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

ADS7800JUE4 Arkusz danych(HTML) 9 Page - Texas Instruments

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ADS7800
9
SBAS001A
www.ti.com
FIGURE 7. Read Mode: R/C Pulse HIGH— Outputs Enabled Only When R/C is High.
SYMBOL
PARAMETER
MIN
TYP
MAX
UNITS
tW
R/C Pulse Width
40
10
ns
tDBC
BUSY delay from R/C
80
150
ns
tB
BUSY LOW
2.5
2.7
µs
tAP
Aperture Delay
13
ns
∆t
AP
Aperture Jitter
150
ps, rms
tC
Conversion Time
2.47
2.70
µs
tDBE
BUSY from End of Conversion
100
ns
tDB
BUSY Delay after Data Valid
25
75
200
ns
tA
Acquisition Time
130
300
ns
tA+tC
Throughput Time
2.6
3.0
µs
tHDR
Valid Data Held After R/C LOW
20
50
ns
tS
CS or HBE LOW before R/C Falls
25
5
ns
tH
CS or HBE LOW after R/C Falls
25
0
ns
tDD
Data Valid from CS LOW, R/C HIGH, and HBE in Desired State (Load = 100pF)
65
150
ns
tHDR
Valid Data Held After R/C Low
20
50
ns
tHL
Delay to Hi-Z State after R/C Falls or CS Rises (3k
Ω Pullup or Pulldown)
50
150
ns
TABLE III. Timing Specifications (TMIN to TMAX).
Pin 24 may be slightly more sensitive than pin 23 to supply
variations, but to maintain maximum system accuracy, both
should be well isolated from digital supplies with wide load
variations.
To limit the effects of digital switching elsewhere in a
system on the analog performance of the system, it often
makes sense to run a separate +5V supply conductor from
the supply regulator to any analog components requiring
+5V, including the ADS7800.
The VS pins (23 and 24) should be connected together and
bypassed with a parallel combination of a 6.8
µF tantalum
capacitor and a 0.1
µF ceramic capacitor located close to the
converter to obtain noise-free operation. (See Figure 2.) The
–VS pin 22 should be bypassed with a 1µF tantalum
capacitor, again as close as possible to the ADS7800.
Noise on the power supply lines can degrade converter
performance, especially noise and spikes from a switching
power supply. Appropriate supplies or filters must be used.
The GND pins (4 and 13) are also separated internally, and
should be directly connected to a ground plane under the
FIGURE 8. Conversion Start Timing.
R/C
Converter
Mode
BUSY
Acquire
Convert
Acquire
Convert
Data
Valid
Hi-Z State
Data
BUS
Hi-Z State
Hi-Z State
Data
Valid
tHDR and tHL
tC
tAP
tDBE
tDD
tDBC
tW
tB
tA
tAP
CS or
HBE
R/C
BUSY
t
S
t
H
t
W
t
DBC
Data
Bus
Hi-Z State
Data Valid
tHDR and tHL


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