AD9689-2000EBZ datasheet(40/134 Pages) AD

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AD9689

Data Sheet

Rev. A | Page 40 of 134

PROGRAMMABLE FIR FILTERS

SUPPORTED MODES

The AD9689 supports the following modes of operation (the

asterisk symbol (*) denotes convolution):

•

Real 48-tap filter for each I/Q channel (see Figure 104)

•

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

•

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

•

Real 96-tap filter for on either I or Q channel (see Figure 105)

•

DOUT_I[n] = DIN_I[n] * XY_I_XY_Q[n]

•

DOUT_Q[n] = DIN_Q[n]

•

Real set of two cascaded 24-tap filters for each I/Q channel

(see Figure 106)

•

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

•

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

•

Half complex filter using two real 48-tap filters for the I/Q

channels (see Figure 107)

•

DOUT_I[n] = DIN_I[n]

•

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

XY_I[n]

•

Full complex filter using four real 24-tap filters for the I/Q

channels (see Figure 108)

•

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]

ADC B

CORE

Q (IMAG)

48-TAP FIR

FILTER

xyQ [n]

DINQ [n]

DOUTQ [n]

ADC A

CORE

I (REAL)

48-TAP FIR

FILTER

xyI [n]

DINI [n]

DOUTI [n]

I′ (REAL)

PROGRAMMABLE FILTER (PFILT)

Q′ (IMAG)

SIGNAL

PROCESSING

BLOCKS

JESD204B

INTERFACE

Figure 104. Real 48-Tap Filter Configuration

ADC B

CORE

Q (IMAG)

DINQ [n]

DOUTQ [n]

ADC A

CORE

I (REAL)

96-TAP FIR

FILTER

xIyIxQyQ [n]

DINI [n]

DOUTI [n]

I′ (REAL)

PROGRAMMABLE FILTER (PFILT)

Q′ (IMAG)

SIGNAL

PROCESSING

BLOCKS

JESD204B

INTERFACE

Figure 105. Real 96-Tap Filter Configuration

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