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AD7403BRIZ-RL7 Datasheet(PDF) 21 Page - Analog Devices

Part No. AD7403BRIZ-RL7
Description  16-Bit, Isolated Sigma-Delta Modulator
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7403BRIZ-RL7 Datasheet(HTML) 21 Page - Analog Devices

 
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AD7403
Data Sheet
Z = one sample delay WORD_CLK = output word
rate */
WORD_CLK
ACC3
DIFF1
DIFF3
+
+
DIFF2
Z–1
+
Z–1
Z–1
Figure 38. Differentiator
always @ (posedge word_clk, posedge reset)
begin
if(reset)
begin
acc3_d2 <= 37'd0;
diff1_d <= 37'd0;
diff2_d <= 37'd0;
diff1 <= 37'd0;
diff2 <= 37'd0;
diff3 <= 37'd0;
end
else
begin
diff1 <= acc3 - acc3_d2;
diff2 <= diff1 - diff1_d;
diff3 <= diff2 - diff2_d;
acc3_d2 <= acc3;
diff1_d <= diff1;
diff2_d <= diff2;
end
end
/* Clock the Sinc output into an output
register
WORD_CLK = output word rate */
WORD_CLK
DATA
DIFF3
Figure 39. Clocking Sinc3 Output into an Output Register
always @ ( posedge word_clk )
begin
case ( dec_rate )
16'd32:begin
DATA <= (diff3[15:0] ==
16'h8000) ? 16'hFFFF : {diff3[14:0], 1'b0};
end
16'd64:begin
DATA <= (diff3[18:2] ==
17'h10000) ? 16'hFFFF : diff3[17:2];
end
16'd128:begin
DATA <= (diff3[21:5] ==
17'h10000) ? 16'hFFFF : diff3[20:5];
end
16'd256:begin
DATA <= (diff3[24:8] ==
17'h10000) ? 16'hFFFF : diff3[23:8];
end
16'd512:begin
DATA <= (diff3[27:11] ==
17'h10000) ? 16'hFFFF : diff3[26:11];
end
16'd1024:begin
DATA <= (diff3[30:14] ==
17'h10000) ? 16'hFFFF : diff3[29:14];
end
16'd2048:begin
DATA <= (diff3[33:17] ==
17'h10000) ? 16'hFFFF : diff3[32:17];
end
16'd4096:begin
DATA <= (diff3[36:20] ==
17'h10000) ? 16'hFFFF : diff3[35:20];
end
default:begin
DATA <= (diff3[24:8] ==
17'h10000) ? 16'hFFFF : diff3[23:8];
end
endcase
end
/* Synchronize Data Output*/
always@ ( posedge mclk1, posedge reset )
begin
if ( reset )
begin
data_en <= 1'b0;
enable <= 1'b1;
end
else
begin
if ( (word_count == dec_rate/2
- 1) && enable )
begin
data_en <= 1'b1;
enable <= 1'b0;
end
else if ( (word_count ==
dec_rate - 1)
&& ~enable )
begin
data_en <= 1'b0;
enable <= 1'b1;
end
else
data_en <= 1'b0;
end
end
endmodule
Rev. B | Page 20 of 24


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