C8051F350-TB Silicon Laboratories Inc, C8051F350-TB Datasheet - Page 43
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C8051F350-TB
Manufacturer Part Number
C8051F350-TB
Description
PROTOTYPINGBOARDWITH C8051F350
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F350-TB
Contents
Board
Processor To Be Evaluated
C8051F35x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F350
Silicon Family Name
C8051F35x
Kit Contents
Board
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F350
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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- Download datasheet (2Mb)
5.1.3. Modulator Clock
The ADC0CLK register (SFR Definition 5.4) holds the Modulator Clock (MDCLK) divisor value. The modu-
lator clock determines the switching frequency for the ADC sampling capacitors. Optimal performance will
be achieved when the MDCLK frequency is equal to 2.4576 MHz. The modulator samples the input at a
rate of MDCLK / 128.
5.1.4. Decimation Ratio
The decimation ratio of the ADC filters is selected by the DECI[10:0] bits in the ADC0DECH and
ADC0DECL registers (SFR Definition 5.5 and SFR Definition 5.6, respectively). The decimation ratio is
equal to 1 + DECI[10:0]. The decimation ratio determines how many modulator samples are used to gen-
erate a single output word. The ADC output word rate is equal to the modulator sampling rate divided by
the decimation ratio. For more information on how the ADC output word rate is derived, see SFR Definition
5.4 and SFR Definition 5.6. Higher decimation ratios will produce lower-noise results over a longer conver-
sion period. The minimum decimation ratio is 20. When using the fast filter output, the decimation ratio
must be set to a multiple of 8.
Channel
Channel
AIN+
AIN-
Figure 5.2. ADC0 Buffer Control
Bypass Buffer
Bypass Buffer
High Buffer+
Low Buffer+
High Buffer-
Low Buffer-
Rev. 1.1
AD0BPHE
AD0BNHE
AD0BNLE
AD0BNS1
AD0BNS0
AD0BPLE
AD0BPS1
AD0BPS0
To PGA
To PGA
C8051F350/1/2/3
43
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