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142 DS880F4
CS4207
7.3 Analog Outputs
7.3.1 Output Filter
The Cirrus Application Note titled Design Notes for a 2-Pole Filter with Differential Input, available as
AN48 at www.cirrus.com, discusses the second-order Butterworth filter and differential-to-single-ended
converter that was implemented on the CDB4207 evaluation board. Figure 14 illustrates this implemen-
tation. If only single-ended outputs from the CS4207 are required, the passive output filter shown in
Figure 15 can be used.
7.3.2 Analog Supply Removal
In order to reduce audible artifacts, the analog reference is always powered up, even if the AFG has been
transitioned into D3 state. For maximum power savings during D3, it may be desirable to completely re-
move the analog supplies on the system level. Doing so would cause an uncontrolled discharge of the
internal reference and hence audible artifacts, and must therefore be preceded with a controlled reference
ramp-down, which is initiated by setting the PDREF bit in the DAC Configuration (CIR = 0003h) register
of the Vendor Processing Widget (Node ID = 11h).
7.4 Digital Mic Inputs
For each ADC, the data from the digital mic input pin widgets are multiplexed with the data from the analog
line/mic input pin widgets, and only one pin widget can be selected at any given time. Furthermore, the data
pins for the DMIC interface (DMIC_SDA1/2) are multiplexed with the GPIO0/1 pins and default to GPIO. In
order to successfully setup the data path for a digital microphone, the following steps have to be followed:
1. clear the
TX 2 Enable bit in the S/PDIF RX/TX Interface Control (CIR = 0001h) register of the Vendor
Processing Widget (Node ID = 11h) (only required for DMIC2)
LINEOUTx +
LINEOUTx -
-
+
1000 pF
C0G
220
2.26 k
3300 pF
C0G
698
1.5 k
4.53 k
2.05 k
1.05 k
22 F
2200 pF
C0G
6800 pF
C0G
220 pF
CS4207
AGND
Analog
Output
22 F
Figure 14. Differential to Single-Ended Output Filter
LINEOUTx +
4.7 µF
Analog
Output
2700 pF
+
47.5 k
CS4207
AGND
562
Figure 15. Passive Single-Ended Output Filter
- DIGITAL to ANALOG FEATURES 1
- ANALOG to DIGITAL FEATURES 1
- System Features 2
- General Description 2
- TABLE OF CONTENTS 3
- LIST OF FIGURES 7
- LIST OF TABLES 7
- 1. PIN DESCRIPTIONS 8
- DS880F4 9 9
- Pin Name QFN Pin Description 9
- DS880F4 11 11
- 12 DS880F4 12
- ABSOLUTE MAXIMUM RATINGS 13
- (Note 4) 14
- 16 DS880F4 16
- (48 kHz Fs) 16
- LINEOUT_L/R 18
- HPOUT_L/R 20
- DS880F4 21 21
- Parameter Min Typ Max Unit 21
- Parameters Min Typ Max Units 21
- DMIC_SCL 22
- DMIC_SDA 22
- DS880F4 23 23
- POWER CONSUMPTION 24
- 4.1 Link Reset 25
- 4.2 Function Group Reset 25
- 4.3 Codec Initialization 25
- 26 DS880F4 26
- 28 DS880F4 28
- 5. PRESENCE DETECTION 31
- 32 DS880F4 32
- DS880F4 33 33
- 6.1.1 Node ID Summary 34
- DS880F4 35 35
- 6.2 Root Node (Node ID = 00h) 36
- 6.2.1 Vendor and Device ID 36
- 6.2.2 Revision ID 36
- 6.2.3 Subordinate Node Count 36
- 6.3.1 Subordinate Node Count 37
- 6.3.2 Function Group Type 37
- 38 DS880F4 38
- 6.3.6 Supported Power States 39
- 6.3.7 GPIO Capabilities 40
- 6.3.8 Power States 41
- 6.3.9 GPIO Data 42
- 6.3.10 GPIO Enable Mask 43
- 6.3.11 GPIO Direction 43
- 6.3.12 GPIO Sticky Mask 43
- 6.3.14 Function Reset 44
- DS880F4 45 45
- 46 DS880F4 46
- 6.4.4 Supported Power States 47
- 6.4.6 Power States 48
- 6.4.8 Converter Format 49
- 50 DS880F4 50
- 6.4.9 Amplifier Gain/Mute 51
- 52 DS880F4 52
- DS880F4 53 53
- 54 DS880F4 54
- 6.5.5 Connection List Length 55
- 6.5.6 Supported Power States 56
- DS880F4 57 57
- 6.5.11 Power States 58
- 6.5.13 Converter Format 59
- 60 DS880F4 60
- 6.5.14 Amplifier Gain/Mute 61
- 62 DS880F4 62
- DS880F4 63 63
- 64 DS880F4 64
- 6.6.4 Connection List Length 65
- 6.6.5 Supported Power States 65
- 6.6.6 Connection List Entry 65
- 6.6.7 Power States 66
- 6.6.9 Converter Format 67
- 68 DS880F4 68
- DS880F4 69 69
- 08h, 14h) 70
- DS880F4 71 71
- 6.7.4 Supported Power States 72
- 6.7.5 Power States 72
- DS880F4 73 73
- 6.7.7 Converter Format 74
- DS880F4 75 75
- 76 DS880F4 76
- DS880F4 77 77
- 6.8.2 Pin Capabilities 78
- 6.8.3 Connection List Length 79
- 6.8.4 Supported Power States 79
- 6.8.5 Connection List Entry 80
- 6.8.6 Power States 80
- 6.8.7 Pin Widget Control 81
- 82 DS880F4 82
- 6.8.9 Pin Sense 83
- 6.8.10 Configuration Default 83
- 84 DS880F4 84
- DS880F4 85 85
- 6.9.2 Pin Capabilities 86
- 6.9.3 Connection List Length 86
- 6.9.4 Supported Power States 87
- 6.9.5 Connection List Entry 87
- 6.9.6 Power States 87
- 6.9.7 Pin Widget Control 88
- DS880F4 89 89
- 6.9.9 Pin Sense 90
- 6.9.10 EAPD/BTL Enable 90
- 6.9.11 Configuration Default 91
- 92 DS880F4 92
- 6.10.2 Pin Capabilities 93
- 6.10.3 Connection List Length 93
- 6.10.4 Connection List Entry 94
- 6.10.5 Pin Widget Control 94
- 6.10.6 EAPD/BTL Enable 95
- 6.10.7 Configuration Default 96
- DS880F4 97 97
- 98 DS880F4 98
- 6.11.5 Supported Power States 99
- 6.11.6 Power States 99
- 100 DS880F4 100
- DS880F4 101 101
- 102 DS880F4 102
- 6.11.10 Pin Sense 103
- 104 DS880F4 104
- DS880F4 105 105
- 6.11.14 Amplifier Gain/Mute 106
- DS880F4 107 107
- 108 DS880F4 108
- 6.12.2 Pin Capabilities 109
- 6.12.4 Pin Widget Control 110
- DS880F4 111 111
- 6.12.7 Amplifier Gain/Mute 112
- DS880F4 113 113
- 114 DS880F4 114
- 6.13.2 Pin Capabilities 115
- 6.13.3 Supported Power States 115
- 6.13.4 Power States 116
- 6.13.5 Pin Widget Control 117
- 6.13.7 Pin Sense 118
- 6.13.8 Configuration Default 119
- 120 DS880F4 120
- 6.14.2 Pin Capabilities 121
- 6.14.3 Connection List Length 121
- 122 DS880F4 122
- 6.14.6 Pin Widget Control 123
- 124 DS880F4 124
- DS880F4 125 125
- 126 DS880F4 126
- 6.15.3 Processing State 127
- 6.15.4 Coefficient Index 127
- 6.15.5 Processing Coefficient 128
- 6.15.6 Coefficient Registers 128
- DS880F4 129 129
- 130 DS880F4 130
- DS880F4 131 131
- 132 DS880F4 132
- DS880F4 133 133
- 134 DS880F4 134
- DS880F4 135 135
- 136 DS880F4 136
- DS880F4 137 137
- 7. APPLICATIONS 138
- 7.2 Analog Inputs 139
- 140 DS880F4 140
- DS880F4 141 141
- 7.3 Analog Outputs 142
- 7.3.1 Output Filter 142
- 7.3.2 Analog Supply Removal 142
- 7.4 Digital Mic Inputs 142
- 7.5 S/PDIF Input and Outputs 143
- 7.5.1 S/PDIF Receiver SRC 143
- 8. PCB LAYOUT CONSIDERATIONS 144
- 9. PARAMETER DEFINITIONS 145
- 10.QFN PACKAGE DIMENSIONS 146
- THERMAL CHARACTERISTICS 146
- 11.ORDERING INFORMATION 147
- 12.REFERENCES 147
- 13.REVISION HISTORY 147
- 148 DS880F4 148
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