AD1953_15 datasheet(32/36 Pages) AD

32 / 36 page

REV. 0

AD1953

–32–

The sub output of the AD1953 has a lower drive strength than

the left and right output pins (

±0.25 mA peak versus ±0.5 mA

peak for the left and right outputs). For this reason, it is best to

use higher resistor values in the external sub filter. Figure 24

shows a recommended filter design for the subwoofer output

pins used as a full-bandwidth channel in a custom-designed

program. This design is also a 100 kHz Bessel filter.

For best performance, a large (> 10

µF) capacitor should be

connected between the FILTCAP pin and analog ground. This

pin is connected to an internal node in the bias generator, and

by adding an external capacitance to this pin, the thermal noise

of the left/right channels is minimized. The sub channel is not

affected by this connection.

1.50k

3.01k

2.80k

2.7nF

499

1.00k

806

1nF

820pF

270pF

2.2nF

549

– INPUT

+ INPUT

OUT

Figure 22. Recommended External Analog Filter for

Main Channels

GRAPHICAL CUSTOM PROGRAMMING TOOLS

Custom programming tools are available for the AD1953 from

ADI. These graphical tools allow the user to modify the default

signal processing flow by individually placing each block (e.g.,

biquad filter, Phat Stereo, dynamics processor) and connecting

them in any desired fashion. The program then creates a file

that is loaded into the AD1953’s program RAM. All of the

contents of the parameter RAM can also be set using these

tools. For more information on these programming tools, email

SigmaDSP@analog.com.

3.01k

11k

56nF

1.5k

5.62k

27nF

15nF

6.8nF

220nF

604

– INPUT

+ INPUT

OUT

560nF

270nF

68pF

150pF

2.2nF

Figure 23. Recommended External Analog Filter for

Sub Channel

3.01k

11k

56nF

1.5k

5.62k

27nF

604

– INPUT

+ INPUT

OUT

68pF

150pF

2.2nF

Figure 24. Recommended External Analog Filter for Full

Bandwidth Signals on the Sub Channel Output

AD1953 数据表(PDF) 32 Page - Analog Devices

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AD1953 数据表(PDF) 32 Page - Analog Devices

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