TLV320AD11APZ datasheet(13/28 Pages) TI

13 / 28 page

TLV320AD11A

3.3 V INTEGRATED ADSL OVER POTS CODEC

SLWS087B – JUNE 1999 – REVISED MARCH 2000

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

examples:

• Positive SCR5 + positive SCR4

(0x24

× 24 + 0x42) = 0×240 + 0×42 = 0×282 = 642 decimal

Analog output = (642 + 2048)

∆V = 2690 ∆V = 1.971 V

The read back values of SCR5 and SCR4 are 0

×02 and 0×82

• Positive SCR5 + negative SCR4

(0x24

× 24 + 0×C2) = 0×240 + 0×FC2 = 0×202 = 514 decimal

Analog output = (514 + 2048)

∆V = 2562 ∆V = 1.877 V

The read back values of SCR5 and SCR4 are 0

×02 and 0×02

• Negative SCR5 + positive SCR4

(0xA2

× 24 + 0×42) = 0×A20 + 0×42 = 0×A62 = –1438 decimal

Analog output = (–1438 + 2048)

∆V = 610 ∆V = 0.447 V

The read back values of SCR5 and SCR4 are 0

×0A and 0×62

• Negative SCR5 + negative SCR4

(0xA2

× 24 + 0×C2) = 0×A20 + 0×FC2 = 0×9E2 = –1566 decimal

Analog output = (–1566 + 2048)

∆V = 482 ∆V = 0.353 V

The read back values of SCR5 and SCR4 are 0

×09 and 0×E2

SCR6 – general-purpose output data register

Address:0110b

Contents at reset: 00000000b

VALUE (HEX)

DESCRIPTION

0/1

–

GP7 = low(0)/high(1)

–

0/1

–

GP6 = low(0)/high(1)

–

0/1

–

GP5 = low(0)/high(1)

–

0/1

–

GP4 = low(0)/high(1)

–

0/1

–

GP3 = low(0)/high(1)

–

0/1

–

GP2 = low(0)/high(1)

–

0/1

–

GP1 = low(0)/high(1)

–

0/1

GP0 = low(0)/high(1)

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