XE8801AMI027LF Semtech, XE8801AMI027LF Datasheet - Page 109
XE8801AMI027LF
Manufacturer Part Number
XE8801AMI027LF
Description
IC DAS 16BIT FLASH 8K MTP 44LQFP
Manufacturer
Semtech
Datasheet
1.XE8801AMI027LF.pdf
(135 pages)
Specifications of XE8801AMI027LF
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
44-LQFP
For Use With
XE8000MP - PROG BOARD AND PROSTART2 CARD
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Manufacturer
Quantity
Price
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16.8.4
Ideally, a constant input voltage V
output code may vary for a fixed input voltage. Thus, a statistical analysis on the output code of 1200 conversions for
a constant input voltage was performed to derive the equivalent noise levels of PGA1, PGA2, and PGA3. The
extracted rms output noise of PGA1, 2, and 3 are given in Table 16-27: standard output deviation and output rms
noise voltage. Figure 16-17 shows the distribution for the ADC alone (PGA1, 2, and 3 bypassed). Quantization noise
is dominant in this case, and, thus, the ADC thermal noise is below 16 bits.
The simple noise model of Figure 16-18(a) is used to estimate the equivalent input referred rms noise V
acquisition chain in the model of Figure 16-18(b). This is given by the relationship:
where V
stages 1 to 3 respectively. As shown in this equation, noise can be reduced by increasing OSR and N
(increases the ADC averaging effect, but reduces noise).
© Semtech 2005
Table 16-27 PGA noise measurements (n = 16 bits, OSR = 512, N
V
N1
N
, V
,
Noise
IN
2
N2
=
, and V
(
V
N
1
/
GD
N3
Note: see noise model of Figure 16-18 and equation Eq. 21.
Output rms noise (µV)
1
are the output rms noise figures of Table 16-27, GD
Standard deviation at
)
2
ADC output (LSB)
+
Figure 16-16 Differential non-linearity of the ADC converter.
(
Parameter
V
N
2
IN
/(
GD
should result in a constant output code. However, because of circuit noise, the
(
OSR
1
⋅
GD
⋅
N
2
1
))
ELCONV
2
+
(
V
205 (V
)
N
PGA1
0.85
3
/(
16-24
GD
N1
)
1
⋅
GD
340 (V
PGA2
2
1.4
⋅
GD
N2
)
3
))
2
365 (V
ELCONV
PGA3
1.5
(V
1
, GD
2
N3
rms)
)
= 2, V
XE8801A – SX8801R
2
, and GD
(Eq. 21)
REF
= 5V)
3
are the PGA gains of
www.semtech.com
N,IN
ELCONV
of the
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