AD9961-EBZ datasheet(32/60 Pages) AD

32 / 60 page

AD9961/AD9963

Rev. 0 | Page 32 of 60

Address

Bit(s)

Parameter

Function

100000: V

REF = 0.8 V.

100001: V

REF = 0.80625 V.

…

111111 : V

REF = 0.99375 V.

DLL Control 0

0x71

ADCCLKSEL

1: selects DLL output as the ADC sampling clock.

0: selects external clock as the ADC sampling clock.

DACCLKSEL

1: selects DLL output as the DAC sampling clock.

0: selects external clock as the DAC sampling clock.

Unused

DLL_REF_EN

1: enables the input reference clock to the DLL.

3:0

N[3:0]

Sets DLL divide ratio (1 to 8) at the output of the DLL.

0000: not valid.

0001: 1.

0010: 2.

…

0110: 6.

0111: not valid.

1000: 8.

1001: not valid.

…

1111: not valid.

DLL Control 1

0x72

DLL_Locked

1: DLL has locked to reference clock (read only).

6:5

DLLDIV[1:0]

00: DLL output is directly driven out. Divider is bypassed.

01: DLL output is directly driven out. Divider is bypassed.

10: DLL output is divided by 2.

11: DLL output is divided by 4.

4:0

M[4:0]

Sets DLL multiplication factor (1 to 32).

00000: 1.

00001: 2.

…

11111: 32.

DLL Control 2

0x75

7:4

Set these bits to 0.

DLL_RESB

Reset DLL. The DLL must be reset by a low to high transition on this bit

each time the DLL configuration is changed or the reference frequency is

changed.

2:0

Set these bits to 0.

Aux ADC Config

0x77

7:6

CONV_TIME[1:0]

Sets the number of AUXADCCLK cycles required to perform a conversion.

and Conversion

Start

00: 20 AUXADCCLK cycles.

01: 22 AUXADCCLK cycles.

10: 26 AUXADCCLK cycles.

11: 34 AUXADCCLK cycles.

5:3

Unused

2:0

AUXADC_CH[2:0]

Selects analog input channel to the auxiliary ADC.

000: AUXIN1, Pin 72.

001: AUXIO2, Pin 71.

010: AUXIO3, Pin 70.

011: internal VPTAT voltage.

100: internal VCMLI voltage.

101: internal VCMLQ voltage.

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