AD1939

Data Sheet

Rev. E | Page 24 of 32

CONTROL REGISTERS

DEFINITIONS

The global address for the AD1939 is 0x04, shifted left one bit due to the R/W bit. All registers are reset to 0, except for the DAC volume

registers that are set to full volume.

Note that the first setting in each control register parameter is the default setting.

Table 14. Register Format

Global Address

R/W

Register Address

Data

Bit

23:17

16

15:8

7:0

Table 15. Register Addresses and Functions

Address

Function

0

PLL and Clock Control 0

1

PLL and Clock Control 1

2

DAC Control 0

3

DAC Control 1

4

DAC Control 2

5

DAC individual channel mutes

6

DAC L1 volume control

7

DAC R1 volume control

8

DAC L2 volume control

9

DAC R2 volume control

10

DAC L3 volume control

11

DAC R3 volume control

12

DAC L4 volume control

13

DAC R4 volume control

14

ADC Control 0

15

ADC Control 1

16

ADC Control 2

PLL AND CLOCK CONTROL REGISTERS

Table 16. PLL and Clock Control 0 Register

Bit

Value

Function

Description

0

0

Normal operation

PLL power-down

1

Power-down

2:1

00

INPUT 256 (× 44.1 kHz or 48 kHz)

MCLKI/XI pin functionality (PLL active), master clock rate setting

01

INPUT 384 (× 44.1 kHz or 48 kHz)

10

INPUT 512 (× 44.1 kHz or 48 kHz)

11

INPUT 768 (× 44.1 kHz or 48 kHz)

4:3

00

XTAL oscillator enabled

MCLKO/XO pin, master clock rate setting

01

10

11

Off

6:5

00

MCLKI/XI

PLL input

01

DLRCLK

10

ALRCLK

11

Reserved

7

0

Disable: ADC and DAC idle

Internal master clock enable

1

Enable: ADC and DAC active