CS5126-KL Просмотр технического описания (PDF) - Cirrus Logic

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CS5126-KL

16-Bit, Stereo A/D Converter for Digital Audio

Cirrus Logic 

Left Channel

Analog In

Right Channel

Analog In

CS5126

CLKIN

Anti Alias

Filter

+5V

Anti Alias

Filter

AINL

L/R

SDATA

HOLD

SCLK

L/R

AINL

SCLK

HOLD

SDATA

CLKIN

CS5126

DINL

IBO

IBCK

CKIN

OBCK

WDCK

LRCK

DINR

DOL

SM5805

Digital Filter

Figure 10. Example Oversampling System Diagram

CS5126

512 f s

256 f s

32 f s

2 fs

fs

DATA IN

System

at 30kHz and 45kHz. Meanwhile, digital filters

such as the SM5805 shown in Figure 10 will

roll-off rapidly from 22kHz to 28kHz and reject

distortion energy in the second, third, and fourth

harmonics. Clearly, oversampling results in su-

perior system-level distortion.

Still, if the CS5126’s distortion performance

with high-frequency, high-amplitude signals

must be enhanced in 2X oversampling schemes,

the TRKL or TRKR outputs can be used. Either

TRKL or TRKR will fall at the end of each con-

version cycle depending on which channel is be-

ing acquired. The AINL and TRKL connections

(or AINR and TRKR) can be used as shown in

Figure 11 to control an external low-distortion

sample/hold to create an effective dc input for

the CS5126 and remove sampling distortion.

Digital Circuit Connections

When TTL loads are utilized the potential for

crosstalk between digital and analog sections of

the system is increased. This crosstalk is due to

high digital supply and signal currents arising

from the TTL drive current required of each

digital output. Connecting CMOS logic to the

digital outputs is recommended. Suitable logic

families include 4000B, 74HC, 74AC, 74ACT,

and 74HCT.

12

The CS5126 has a power down mode, initiated

by bringing SLEEP low. During power down,

the A/D Converter’s calibration information is

retained. The CS5126 may be used for conver-

sion immediately after SLEEP is brought high.

Left

Analog In

+5V

S/H

AINL

TRKL

L/R

Figure 11. High-Slew Monaural Connections

0dB

-20dB

-40dB

Sampling Rate: 96 kHz

Full Scale: 9V p-p

S/(N+D): 91.44 dB

S/(N+D): 95.25 dB

(dc to 20 kHz)

Signal

Amplitude

Relative to

Full Scale

-60dB

-80dB

-100dB

-120dB

1 kHz

Input Frequency

48kHz

Figure 12. FFT Plot of CS5126 in Monaural 2X Over-

sampling Mode

DS32F1

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