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SP8510 Datasheet(PDF) 10 Page - Sipex Corporation

Part # SP8510
Description  12-Bit Sampling A/D Converters
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP8510 Datasheet(HTML) 10 Page - Sipex Corporation

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52
AC DYNAMIC TIMING DATA
Naturally, transients on the analog input signal are to
be avoided, especially at times within
±20ns of R/C
going LOW, when they may be trapped as part of the
charge on the capacitor array. This requires careful
layout of the circuit in front of the SP85XX Series.
Finally, in multiplexed systems, the timing relative to
when the multiplexer is switched may affect the
analog performance of the system. In most applica-
tions, the multiplexer can be switched as soon as R/C
goes LOW (with appropriate delays), but this may
affect the conversion if the switched signal shows
glitches or significant ringing at the SP85XX Series
input. Whenever possible, it is safer to wait until the
conversion is completed before switching and multi-
plexer. The extremely fast acquisition time and con-
version time of the SP85XX Series make this practi-
cal in many applications.
Although not normally required, it is also good prac-
tice to avoid glitches from coupling to the SP85XX
Series while bit decisions are being made. Since the
above discussion calls for a fast, clean rise and fall on
R/C, it makes sense to keep the rising edge of the
convert pulse outside the time when bit decisions are
being made. In other words, the convert pulse should
eitherbeshort(under100nssothatittransitionsbefore
the MSB decision), or relatively long (over 2.75
µs to
transition after the LSB decision).
Next, although the data outputs are forced into a Hi-Z
state during conversion, fast bus transients can still be
capacitively coupled into the SP85XX Series. If the
data bus experiences fast transients during conver-
sion, these transients can be attenuated by adding a
logicbuffertothedataoutputs.TheBUSYoutputcan
be used to enable the buffer.
SYMBOL/PARAMETER
MIN .
TYP.
MAX.
UNITS
t
W
R/C Pulse Width
40
ns
t
DBC
BUSY delay from R/C
80
150
ns
t
B
BUSY LOW
2.47
2.7
µs
t
AP
Aperture Delay
13
ns
∆t
AP
Aperture Jitter
150
ps, rms
t
C
Conversion Time
2.5
2.70
µs
t
DBE
BUSY from End of Conversion
100
ns
t
DB
BUSY Delay after Data Valid
25
75
200
ns
t
A
Acquisition Time
130
300
ns
t
A + tC
Throughput Time
SP8503
3.0
µs
SP8505
5.0
µs
SP8510
10.0
µs
t
HDR
Valid Data Held After R/C LOW
20
50
ns
t
S
CS or HBE LOW before R/C Falls
25
5
ns
t
H
CS or HBE LOW after R/C Falls
25
0
ns
t
DD
Data Valid from CS LOW, R/C HIGH, and HBE
65
150
ns
in Desired State (Load = 100pF)
t
HL
Delay to Hi-Z State after R/C Falls or
50
150
ns
CS Rises (3K
Ω Pullup or Pulldown
All parameters Guaranteed By Design.


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