TMC2246A

PRODUCT SPECIFICATION

REV. 1.0.3 9/11/00

11

Table 2. Typical TMC2246A Operation Sequence

Notice in this example, operating in fractional two’s complement mode, that rounding is imposed on the first cycle only of an

accumulation. This avoids the propagation of accumulated roundoff errors.

CLK

D1

C1

ENB1

D2

C2

ENB2

D3

C3

ENB3

D4

C4

ENB4 ACC

Sum

0

-

-

0

-

-

0

-

-

0-

-0-

-

1

D1(1) C1(1)

1

D2(1) C2(1)

1

D3(1) C3(1)

1

D4(1) C4(1)

1

0

-

2

D1(2)

X

0

D2(2) C2(2)

0

D3(2)

X

1

D4(2)

X

1

1

-

3

D1(3) C1(3)

0

D2(3) C2(3)

0

D3(3)

X

0

D4(3)

X

0

1

4

D1(4) C1(4)

-

D2(4) C2(4)

-

D3(4) C3(4)

-

D4(4) C4(4)

-

0

5

S(5)=D1(1)C1(1)+D2(1)C2(1)

6

S(6)=S(5)+D1(2)C1(1)+D2(2)C2(1)

+D3(2)C3(1)+D4(2)C4(1)

7

S(7)=S(6)+D1(3)C1(3)+D2(3)C2(3)

+D3(3)C3(1)+D4(3)C4(1)

8

S(8)=D1(4)C1(4)+D2(4)C2(4)

+D3(4)C3(4)+D4(4)C4(4)+2

-10