AD9689-2000EBZ datasheet(129/134 Pages) AD

129 / 134 page

Data Sheet

AD9689

Rev. A | Page 129 of 134

Addr.

Name

Bit(s) Bit Name

Setting

Description

Reset

Access

0x1262 JESD204B PLL

LOL bit

control

[7:0] JESD204B PLL loss of

lock bit clear

See Table 32.

0x00

R/W

0x00

Loss of lock bit normal operation.

0x80

Clear loss of lock bit.

Programmable Filter (PFILT) Control and Coefficients Registers

Table 52.

Addr.

Name

Bit(s) Bit Name

Setting

Description

Reset Access

0x0DF8 Programmable

filter control

[7:3] Reserved

Reserved.

0x0

[2:0] Programmable filter

mode

PFILT mode. The asterisk symbol (*) denotes convolution.

0x0

R/W

000

Disabled (filters bypassed).

001

Single filter (X only).

DOUT_I[n] = DIN_I[n] * X_I[n]

DOUT_Q[n] = DIN_Q[n] * X_Q[n]

010

Single filter (X and Y together)

DOUT_I[n] = DIN_I[n] * XY_I[n]

DOUT_Q[n] = DIN_Q[n] * XY_Q[n]

100

Cascaded filters (X to Y).

DOUT_I[n] = DIN_I[n] * X_I[n] * Y_I[n]

DOUT_Q[n] = DIN_Q[n] * X_Q[n] * Y_Q[n]

101

Complex filters.

DOUT_I[n] = DIN_I[n] * X_I[n] + DIN_Q[n] * Y_Q[n]

DOUT_Q[n] = DIN_Q[n] * X_Q[n] + DIN_I[n] * Y_I[n]

110

Half complex filter.

DOUT_I[n] = DIN_I[n]

DOUT_Q[n] = DIN_Q[n] * XY_Q[n] + DIN_I[n] * XY_I[n]

111

Real 96-tap filter.

DOUT_I[n] = DIN_I[n] * XY_I[n].

DOUT_Q[n] = DIN_Q[n] * XY_Q[n]

0x0DF9 PFILT gain

Reserved

Reserved.

0x0

[6:4] PFILT Y gain

PFILT Y gain.

0x0

R/W

110

−12 dB loss.

111

−6 dB loss.

000

0 dB gain.

001

+6 dB gain.

010

+12 dB gain.

Reserved

Reserved.

0x0

[2:0] PFILT X gain

PFILT X gain.

0x0

R/W

110

−12 dB loss.

111

−6 dB loss.

000

0 dB gain.

001

+6 dB gain.

010

+12 dB gain.

0x0E00

0x0E7F

Programmable

Filter X

Coefficient x

[7:0] Programmable Filter X

Coefficient 0 to 127

Refer to the I coefficient table (Table 14) and the Q coefficient table

(Table 15) in the Programmable FIR Filters section for details.

Coefficients are only applied after the chip transfer bit

(Register 0x000F, Bit 0) is set.

0x0

R/W

0x0F00

0x0F7F

Programmable

Filter Y Coefficient

[7:0] Programmable Filter Y

Coefficient 0 to 127

Refer to the I coefficient table (Table 14) and the Q coefficient table

(Table 15) in the Programmable FIR Filters section for details.

Coefficients are only applied after the chip transfer bit

(Register 0x000F, Bit 0) is set.

0x0

R/W

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