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MCP37D31-80E/TE Datasheet(PDF) 52 Page - Microchip Technology

Part # MCP37D31-80E/TE
Description  80 Msps, 16/14-Bit High-Pr ecision Pipelined ADC
PDF  141 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP37D31-80E/TE Datasheet(HTML) 52 Page - Microchip Technology

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 2020 Microchip Technology Inc.
DS20006382A-page 52
MCP37D31-80 AND MCP37D21-80
FIGURE 4-13:
Response of the Dual-
Channel Fractional Delay Recovery (1st Nyquist
Band). fS is the Sampling Frequency.
FIGURE 4-14:
Response of the Octal-
Channel Fractional Delay Recovery (1st Nyquist
Band). fS is the Sampling Frequency.
TABLE 4-10:
CONTROL PARAMETERS FOR FRACTIONAL DELAY RECOVERY (FDR)
Channel Operation
Control Parameter Register
Descriptions
Global control for both
dual and octal-channel
modes
EN_FDR = 1
0x7A
Enable FDR features
FDR_BAND
0x81
Select 1st or 2nd Nyquist band
Dual-channel
SEL_FDR = 0
0x81
Select FDR for dual-channel mode
EN_DSPP_8 = 0
0x81
Select digital signal post-processing feature for
dual-channel mode
EN_DSPP_2 = 1
0x79
Enable all digital post-processing functions for
dual-channel operation
Octal-channel
SEL_FDR = 1
0x81
Select FDR for octal-channel mode
EN_DSPP_8 = 1
0x81
Select digital signal post-processing feature for
octal-channel operation
TABLE 4-11:
INPUT BANDWIDTH
REQUIREMENT FOR FDR
Bandwidth
in percentage
of fS(1)
Nyquist Band (2)
Dual-Channel Mode
0– 45%
1st Nyquist Band (FDR_BAND = 0)
55–100%
2nd Nyquist Band (FDR_BAND = 1)
45 – 55%
Avoid
Octal-Channel Mode
0– 38%
1st Nyquist Band (FDR_BAND = 0)
Note 1:
fs is sampling frequency per channel.
Distortion is less than 0.1 mdB.
2:
See Address 0x81 for FDR_BAND bit
setting
0fS/2
fS
Frequency
0fS/2
fS
Interpolation Filter Frequency Response
In-Band Ripple
0.0005
0
-0.0005
0
-30
-60
-90
-120
In-Band Ripple
0fS/2
fS
2
×fS
3
×fS
4
×fS
Frequency
0fS/2
fS
2
×fS
3
×fS
4
×fS
Frequency
0.0005
0
-0.0005
0
-30
-60
-90
-120



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