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參數資料
型號: AD7400YRWZ-REEL7
廠商: Analog Devices Inc
文件頁數: 7/20頁
文件大?。?/td> 0K
描述: IC MODULATOR SIGMA-DELTA 16-SOIC
標準包裝: 400
類型: 調制器
分辨率(位): 16 b
采樣率(每秒): 10M
數據接口: 串行
電壓電源: 單電源
電源電壓: 4.5 V ~ 5.25 V
工作溫度: -40°C ~ 105°C
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.295",7.50mm 寬)
供應商設備封裝: 16-SOIC W
包裝: 帶卷 (TR)
Data Sheet
AD7400
Rev. G | Page 15 of 20
DIGITAL FILTER
A Sinc3 filter is recommended for use with the AD7400. This
filter can be implemented on an FPGA or a DSP. The following
Verilog code provides an example of a Sinc3 filter implementation
on a Xilinx Spartan-II 2.5 V FPGA. This code can possibly be
compiled for another FPGA, such as an Altera device. Note
that the data is read on the negative clock edge in this case,
although it can be read on the positive edge if preferred. Figure 28
shows the effect of using different decimation rates with various
filter types.
/*`Data is read on negative clk edge*/
module DEC256SINC24B(mdata1, mclk1, reset,
DATA);
input
mclk1;
/*used to clk filter*/
input
reset;
/*used to reset filter*/
input
mdata1;
/*ip data to be
filtered*/
output [15:0] DATA;
/*filtered op*/
integer location;
integer info_file;
reg [23:0]
ip_data1;
reg [23:0]
acc1;
reg [23:0]
acc2;
reg [23:0]
acc3;
reg [23:0]
acc3_d1;
reg [23:0]
acc3_d2;
reg [23:0]
diff1;
reg [23:0]
diff2;
reg [23:0]
diff3;
reg [23:0]
diff1_d;
reg [23:0]
diff2_d;
reg [15:0]
DATA;
reg [7:0]
word_count;
reg word_clk;
reg init;
/*Perform the Sinc ACTION*/
always @ (mdata1)
if(mdata1==0)
ip_data1 <= 0;
/* change from a 0
to a -1 for 2's comp */
else
ip_data1 <= 1;
/*ACCUMULATOR (INTEGRATOR)
Perform the accumulation (IIR) at the speed
of the modulator.
04718-021
MCLKOUT
IP_DATA1
ACC1+
ACC2+
ACC3
+
Z
+
Z
+
Z
Figure 25. Accumulator
Z = one sample delay
MCLKOUT = modulators conversion bit rate
*/
always @ (negedge mclk1 or posedge reset)
if (reset)
begin
/*initialize acc registers on reset*/
acc1 <= 0;
acc2 <= 0;
acc3 <= 0;
end
else
begin
/*perform accumulation process*/
acc1 <= acc1 + ip_data1;
acc2 <= acc2 + acc1;
acc3 <= acc3 + acc2;
end
/*DECIMATION STAGE (MCLKOUT/ WORD_CLK)
*/
always @ (posedge mclk1 or posedge reset)
if (reset)
word_count <= 0;
else
word_count <= word_count + 1;
always @ (word_count)
word_clk <= word_count[7];
/*DIFFERENTIATOR (including decimation stage)
Perform the differentiation stage (FIR) at a
lower speed.
WORD_CLK
ACC3
DIFF1
DIFF3
+
+
DIFF2
Z–1
+
Z–1
04718-
022
Figure 26. Differentiator
Z = one sample delay
WORD_CLK = output word rate
*/
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