XE8801AMI027LF Semtech, XE8801AMI027LF Datasheet - Page 115
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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16.9.4
The incremental ADC is an over-sampled converter with two main blocks: an analog modulator and a low-pass
digital filter. The main function of the digital filter is to remove the quantization noise introduced by the modulator. As
shown in Figure 16-26, this filter determines the frequency response of the transfer function between the output of
the ADC and the analog input V
period OSR/f
elementary conversions N
and are repeated every f
Information on the location of these notches is particularly useful when specific frequencies must be filtered out by
the acquisition system. For example, consider a 5Hz-bandwidth, 16-bit sensing system where 50Hz line rejection is
needed. Using the above equation and the plots below, we set the 4th notch for N
= 50Hz. The sampling frequency is then calculated as f
also good attenuation of 50Hz harmonics.
© Semtech 2005
4)
5)
6)
f
For highest linearity and lowest noise performance, bypass all PGAs and use the ADC alone (applications
where no "zooming" is needed); i.e. set ENABLE[3:0] = '0001'.
For low-noise applications where power consumption is not a primary concern, maintain the largest bias
currents in the PGAs and in the ADC; i.e. set IB_AMP_PGA[1:0] = IB_AMP_ADC[1:0] = '11'.
For lowest output offset error at the output of the ADC, bypass PGA2 and PGA3. Indeed, PGA2 and PGA3
typically introduce an offset of about 5 to 10 LSB (16 bit) at their output. Note, however, that the ADC
output offset is easily calibrated out by software.
NOTCH
Frequency Response
S
. The plots of Figure 16-26 also show that the frequency response changes with the number of
) (
i
=
OSR
i
⋅
S
⋅
N
/OSR.
ELCONV
f
ELCONV
S
performed. In particular, notches appear for N
IN
. Notice that the frequency axes are normalized to one elementary conversion
(Hz)
for
i
=
1
2 ,
16-30
S
,...,
= 20.48kHz for OSR = 512. Notice that this choice yields
(
N
ELCONV
−
) 1
ELCONV
(Eq. 23)
ELCONV
XE8801A – SX8801R
≥ 2. These notches occur at:
= 4 to 50Hz, i.e. 1.25⋅f
www.semtech.com
S
/OSR
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