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參數(shù)資料
| 型號(hào)： | AMC1210IRHATG4 |
| 英文描述： | Quad Digital Filter for 2nd-Order Delta-Sigma Modulator |
| 中文描述： | 四數(shù)字濾波器2階Δ-Σ調(diào)制器 |
| 文件頁數(shù)： | 15/47頁 |
| 文件大?。?/td> | 805K |
| 代理商： | AMC1210IRHATG4 |
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Parallel Mode 3
In Parallel Mode 3, the host port uses RD and WR for write and read access to the AMC1210. The current cycle
is processed only when the CS input of the AMC1210 is low. WR indicates to the AMC1210 that the host
processor has initiated a read or write transfer. If WR is high, the AMC1210 outputs data to the host when RD is
also low.
FILTER MODULE
HLT
LLT
Decoding
1:1
to
1:16
Mode 3 Only
Modulator Input (IN )
Modulator Clock (CLK )
System Clock (CLK)
Sample-and-Hold (SH )
Control Unit
Time Unit
Filter Unit
Comparator Unit
Serial
data
Clock
TM = 1
TM = 0
Counter
Parallel data
COMPHx
COMPHx
and COMPLx
to Interrupt Unit
COMPLx
Time
Register X
DEMODULATOR
INTEGRATOR
Integrator Unit
Data
Register X
Parallel or
serial data
Parallel data
AMC1210
SBAS372A–APRIL 2006–REVISED OCTOBER 2006
To configure the registers in the AMC1210, the host process issues a RD signal together with WR low to
indicate that valid data is available on the bus. With the rising edge of the RD signal, the data is latched into the
AMC1210. The address is latched into AMC1210 when the signal ALE is set high. The CS signal can stay low
between two consecutive writes or reads.
Figure 6
provides a detailed timing diagram of Parallel Mode 3.
In all parallel modes, each address can be accessed sequentially without writing a new address to the
AMC1210. When an address is set by the user, a pointer is also set to that address. After each successive read
or write operation, the address is incremented by one in the register map.
The filter module consists of the control block unit, the comparator filter unit, the sinc filter unit, a time
measurement unit and a demodulator/integrator unit. Each unit can be individually programmed for several
different modes of operation.
Figure 13
shows a block diagram of one filter module. The four filter modules are
identical and are able to be configured independently.
Figure 13. AMC1210 Filter Module
15
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