XE8805AMI028LF Semtech, XE8805AMI028LF Datasheet - Page 102
XE8805AMI028LF
Manufacturer Part Number
XE8805AMI028LF
Description
IC DAS 16BIT FLASH 8K MTP 64LQFP
Manufacturer
Semtech
Datasheet
1.XE8805AMI028LF.pdf
(156 pages)
Specifications of XE8805AMI028LF
Applications
Sensing Machine
Core Processor
RISC
Program Memory Type
FLASH (22 kB)
Controller Series
XE8000
Ram Size
512 x 8
Interface
UART, USRT
Number Of I /o
24
Voltage - Supply
2.4 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
64-LQFP
Supply Voltage Range
2.4V To 5.5V
Operating Temperature Range
-40°C To +85°C
Digital Ic Case Style
LQFP
No. Of Pins
64
For Use With
XE8000MP - PROG BOARD AND PROSTART2 CARD
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
XE8805AMI028LF
Manufacturer:
SEMTECH/美国升特
Quantity:
20 000
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16.7.6
As explained using Figure 16-5, conversion time is given by:
and throughput is then simply 1/T
conversions, and a sampling frequency of 500kHz (SET_OSR = "101", SET_NELC = "01", f
"00"). In this case, using Table 16-23, the conversion time is 515 sampling periods, or 1.03ms. This corresponds to
a throughput of 971Hz in continuous-time mode. The plot of Figure 16-7 illustrates the classic trade-off between
resolution and conversion time.
16.7.7
The ADC output code is a 16-bit word in two's complement format (see Table 16-24). For input voltages outside the
range, the output code is saturated to the closest full-scale value (i.e. 0x7FFF or 0x8000). For resolutions smaller
than 16 bits, the non-significant bits are forced to the values shown in Table 16-25. The output code, expressed in
LSBs, corresponds to:
Recalling equation Eq. 9, this can be rewritten as:
© Semtech 2006
T
OUT
CONV
Conversion Time & Throughput
Output Code Format
ADC
=
(
Figure 16-7. Resolution vs. normalized conversion time for different SET_NELC[1:0]
N
=
ELCONV
2
16
Table 16-23. Normalized conversion time (T
⋅
V
⋅
V
IN
(
OSR
REF
,
ADC
SET_OSR
[2:0]
+
⋅
000
001
010
011
100
101
110
111
) 1
OSR
OSR
+
SET_NELC[1:0](normalized to sampling period 1/f
1
/ )
+
CONV
1
f
S
16.0
14.0
12.0
10.0
8.0
6.0
4.0
(s)
(LSB)
1026
. For example, consider an over-sampling ratio of 256, 2 elementary
130
258
514
10.0
00
10
18
34
66
00
Normalized Conversion Time - T
01
SET_NELC[1:0]
1027
2051
10
131
259
515
01
19
35
67
100.0
11
16-16
SET_NELC
1029
2053
4101
133
261
517
10
37
69
1000.0
CONV
1033
2057
4105
8201
CONV
137
265
521
11
73
(Eq. 16)
(Eq.17)
⋅
*f
f
S
S
) vs. SET_OSR[2:0] and
[-]
10000.0
S
)
RC
XE8805/05A
= 2MHz, and FIN =
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