Cirrus-logic CS4244 Uživatelský manuál stáhnout pdf (Strana 38)

DS900F1 38

CS4244

De-emphasis is only available in Single-speed Mode.

4.6.4 Analog Outputs

The recommended differential passive output filter is shown below. The filter has a flat frequency re-

sponse in the audio band while rejecting as much signal energy outside of the audio band as possible.

The filter has a single-pole high-pass filter to AC-couple the output signal to the load and a single-pole

low-pass filter to attenuate high-frequency energy resulting from the CS4244 DAC’s noise shaping func-

tion.

Gain

-10dB

0dB

Frequency

T2 = 15 µs

T1=50 µs

F1 F2

3.183 kHz 10.61 kHz

Figure 27. De-emphasis Curve

DAC1-4

AOUTx+

22 µF

1500 pF

470



47 k 

C0G

AOUTx-

22 µF

1500 pF

470



47 k 

C0G

Figure 28. Passive Analog Output Filter

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 62 63

DAC Features 1
ADC Features 1
System Features 1
Common Applications 1
General Description 1
TABLE OF CONTENTS 2
LIST OF FIGURES 3
LIST OF TABLES 4
1. PIN DESCRIPTIONS 5
1.1 I/O Pin Characteristics 6
Digital Signal 7
Processor 7
ABSOLUTE MAXIMUM RATINGS 8
TYPICAL CURRENT CONSUMPTION 10
(Note 13) 11
CS4244 AINx 13
DS900F1 13 13
CS4244 AINx + 13
25000/Fs 14
DIGITAL I/O CHARACTERISTICS 18
DS900F1 20 20
4. APPLICATIONS 22
4.2.2 Power-down 23
4.2.3 DAC DC Loading 23
4.3 I²C Control Port 24
CS4244 after 25
CS4244, the chip address 25
4.3.1.1 Map Increment (INCR) 26
4.4 System Clocking 26
4.4.1 Master Clock 26
4.4.3 Slave Mode Clock Ratios 27
4.5 Serial Port Interface 28
4.5.1 TDM Mode 28
DS900F1 29 29
4.6 Internal Signal Path 31
4.6.1.1 ADC Signal Routing 31
4.6.1.2 DAC1-4 Signal Routing 32
4.6.2 ADC Path 35
4.6.2.1 Analog Inputs 35
4.6.2.3 ADC HPF 36
4.6.3 DAC1-4 Path 37
4.6.3.1 De-emphasis Filter 37
4.6.4 Analog Outputs 38
4.6.5 Volume Control 39
4.6.5.1 Mute Behavior 39
4.6.5.2 Soft Ramp 39
MIN_DELAY 40
MAX_DELAY 40
4.6.5.3 Noise Gate 41
4.7 Reset Line 42
4.8.1 Interrupt Masking 43
DS900F1 44 44
5. REGISTER QUICK REFERENCE 45
DS900F1 46 46
6. REGISTER DESCRIPTIONS 47
6.3.1 Base Rate Advisory 48
6.3.2 Speed Mode 48
6.3.3 Master Clock Rate 48
76543210 49
6.5.4 Master/Slave 50
6.6.1 DAC1-4 Data Source 50
6.9.1 DAC1-4 Noise Gate 52
6.9.2 DAC1-4 De-emphasis 52
6.10.1 Inv. DACx 52
6.13.1 Mute Delay 54
6.13.2 Minimum Delay 54
6.13.3 Maximum Delay 54
6.14.1 x Volume Control 55
6.15.1 INT MODE 55
Reserved 57
6.19.1 DACx Clip 58
7. ADC FILTER PLOTS 59
8. DAC FILTER PLOTS 60
DS900F1 61 61
9. PACKAGE DIMENSIONS 62
10.ORDERING INFORMATION 63
11.REVISION HISTORY 63

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Cirrus-logic CS4244 Uživatelský manuál Strana 38

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