Cirrus-logic CS4202 User Manual Page 52
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CS4202
52 DS549PP2
the part behaves as specified in AC ’97. As shown in
Figure 24, if the HPCFG pin is grounded, the part be-
haves as if HP_OUT was the only output. In this
case, LINE_OUT will be muted, the Master Volume
Register (Index 02h) will control HP_OUT and
PC_BEEP will be routed to HP_OUT during RE-
SET.
10.2.2 Mono Output
The mono output, MONO_OUT, can be either a sum
of the left and right output channels, attenuated by
6 dB to prevent clipping at full scale, or the selected
Mic signal. The mono out channel can drive the PC
internal mono speaker using an appropriate buffer
circuit.
10.3 Miscellaneous Analog Signals
The AFLT1 and AFLT2 pins must have a 1000 pF
NPO capacitor to analog ground. These capacitors
provide a single-pole low-pass filter at the inputs to
the ADCs. This makes low-pass filters at each analog
input pin unnecessary.
The REFFLT pin must have a short, wide trace to a
2.2 µF and a 0.1 µF capacitor connected to analog
ground (see Figure 26 in Section 11, Grounding and
Layout, for an example). The 2.2 µF capacitor must
not be replaced by any other value (it may be re-
placed with two 1 µF capacitors in parallel) and must
be ceramic with low leakage current. Electrolytic ca-
pacitors should not be used. No other connection
should be made, as any coupling onto this pin will
degrade the analog performance of the CS4202.
Likewise, digital signals should be kept away from
REFFLT for similar reasons.
10.4 Power Supplies
The power supplies providing analog power should
be as clean as possible to minimize coupling into the
analog section which could degrade analog perfor-
mance. The +5 V analog supply should be generated
from a voltage regulator (7805 type) connected to a
+12 V supply. This helps isolate the analog circuitry
from noise typically found on +5 V digital supplies.
A typical voltage regulator circuit for analog power
using an MC78M05CDT is shown in Figure 25. One
analog power pin, AVdd2, supplies power to the
headphone amplifier on the CS4202. The other ana-
log power pin, AVdd1, supplies power to the rest of
the CS4202 analog circuitry. The digital power pins,
DVdd1 and DVdd2, should be connected to the same
HP_OUT_R
HP_OUT_C
HP_OUT_L
220
µ
F
ELEC
220
µ
F
ELEC
1
µ
F
ELEC
10 k
Ω
10 k
Ω
AGND AGND
LINE_OUT_R
LINE_OUT_L
10
µ
F
ELEC
10
µ
F
ELEC
220 k
Ω
220 k
Ω
AGND AGND
Headphone
Jack
Line Out
Jack
HPCFG
1000 pF1000 pF
AGND
+
+
+
+
+
Figure 23. Line Out and Headphone Out Setup
HP_OUT_R
HP_OUT_C
HP_OUT_L
220
µ
F
ELEC
220
µ
F
ELEC
1
µ
F
ELEC
10 k
Ω
10 k
Ω
AGND AGND
LINE_OUT_R
LINE_OUT_L
Line Out/
Headphone
Jack
HPCFG
AGND
+
+
+
Figure 24. Line Out/Headphone Out Setup
- Features 1
- Description 1
- TABLE OF CONTENTS 2
- LIST OF FIGURES 4
- LIST OF TABLES 5
- MIXER CHARACTERISTICS 7
- 9
- 10 DS549PP2 10
- Figure 1. Power Up Timing 10
- Figure 3. Clocks 10
- DS549PP2 11 11
- Figure 6. Test Mode 11
- 2. GENERAL DESCRIPTION 12
- 2.1 AC-Link 12
- 2.2 Control Registers 13
- 2.3 Sample Rate Converters 13
- 2.4 Mixers 13
- 2.5 Input Mux 13
- 2.6 Volume Control 13
- 14 DS549PP2 14
- 3. AC-LINK FRAME DEFINITION 15
- 20 DS549PP2 20
- 4. REGISTER INTERFACE 21
- 0000000ID8ID700ID40000 22
- Mute 0 ML5 22
- 00000SL2SL1SL000000SR2SR1SR0 26
- 000000MIXMSLPBK0000000 28
- 11111111111GP4GP3GP2GP1GP0 35
- 00000000000GS4GS3GS2GS1GS0 35
- 5. SERIAL DATA PORTS 42
- 5.1 Overview 42
- 5.2 Multi-Channel Expansion 42
- 5.3 Serial Data Formats 43
- 6. SONY/PHILIPS DIGITAL 44
- INTERFACE (S/PDIF) 44
- 7. EXCLUSIVE FUNCTIONS 44
- DS549PP2 45 45
- 8.2 Powerdown Controls 46
- + DVdd/Rload/2 47
- 9. CLOCKING 48
- 9.3 Secondary Codec Operation 48
- 22 pF 22 pF 49
- 24.576 MHz 49
- 50 DS549PP2 50
- Figure 19. Differential 1 V 50
- CD Input 50
- 10.1.4 PC Beep Input 51
- 10.1.5 Phone Input 51
- 10.2 Analog Outputs 51
- 10.2.1 Stereo Outputs 51
- 10.2.2 Mono Output 52
- 10.4 Power Supplies 52
- 10.5 Reference Design 53
- 11. GROUNDING AND LAYOUT 54
- DS549PP2 55 55
- CS4202 48-pin 56
- Package Layout 56
- Audio I/O Pins 57
- AC-Link Pins 59
- Clock and Configuration Pins 60
- Misc. Digital Interface Pins 60
- Power Supply Pins 61
- 14.REFERENCE DESIGN 64
- 15.REFERENCES 65
- 48L LQFP PACKAGE DRAWING 66
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