4

MD2131

Supertex inc.

www.supertex.com

Doc.# DSFP-MD2131

C102412

Serial Register Description

Command

MSB

DAC Value Register

LSB

Vector Angle Register

C1

C0

D7

D6

D5

D4

D3

D2

D1

D0

A5

A4

A3

A2

A1

A0

Command Description

Command

Description

C1

C0

0

0

Write to input register

0

1

Read register

1

0

Power down triggered at C[1:0] = 10 and cs rise edge, other state power-up

1

1

No operation

DAC Input and Output Description

MSB

DAC Value Register

LSB

PA/PB Output Current

D7

D6

D5

D4

D3

D2

D1

D0

0

0

0

0

0

0

0

0

(0/255)I

0

0

0

0

0

0

0

1

(1/255)I

0

1

1

1

1

1

1

1

(127/255)I

1

0

0

0

0

0

0

0

(128/255)I

1

1

1

1

1

1

1

0

(254/255)I

1

1

1

1

1

1

1

1

(255/255)I

Angle Register and I/Q Vector Description

MSB

Angle Register

LSB

Angle

I-Vector (6-bit)

Q-Vector (6-bit)

A5

A4

A3

A2

A1

A0

Degree

COS

SIN

0

0

0

0

0

0

0

111111

000000

0

0

0

0

0

1

7.5

111110

001000

0

0

0

1

1

0

101101

101101

0

0

1

1

0

0

90

000000

111111

0

1

0

0

1

0

135

-101101

101101

0

1

1

0

0

0

180

-111111

000000

0

1

1

1

1

0

225

-101101

-101101

1

0

0

1

0

0

270

-000000

-111111

1

0

1

0

1

0

315

101101

-101101

1

0

1

1

1

1

352.5

111110

-001000

1

1

0

0

0

0

111111

000000

Notes:

1.

Maximum current magnitude of output PA or PB is at 45° angle, when IA = QA = Hi or IB = QB = Hi.

2.

Angle>110000B (48) are reserved states.

MSB

LSB