CS4202-JQZ Cirrus Logic Inc, CS4202-JQZ Datasheet - Page 50

• Manufacturer Part Number: CS4202-JQZ
• Description: IC AC 97 W/HEADPHONE AMP 48TQFP
• Manufacturer: Cirrus Logic Inc
• Type: Audio Codec '97r

Specifications of CS4202-JQZ

• Package / Case: 48-LQFP
• Data Interface: Serial
• Resolution (bits): 18, 20 b
• Number Of Adcs / Dacs: 1 / 1
• Sigma Delta: Yes
• Dynamic Range, Adcs / Dacs (db) Typ: 90 / 90
• Voltage - Supply, Analog: 4.75 V ~ 5.25 V
• Voltage - Supply, Digital: 4.75 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Number Of Adc Inputs: 8
• Number Of Dac Outputs: 3
• Conversion Rate: 48 KSPS
• Interface Type: Serial (5-Wire, I2S)
• Resolution: 18 bit, 20 bit
• Operating Supply Voltage: 3.3 V, 5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Number Of Channels: 1 ADC/1 DAC
• Supply Current: 10 mA
• Thd Plus Noise: - 84 dB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 598-1181

10. ANALOG HARDWARE
The analog input section consists of four stereo
line-level
VIDEO_L/R, and AUX_L/R), two selectable
mono microphone inputs (MIC1 and MIC2), and
two mono inputs (PC_BEEP and PHONE). The an-
alog output section consists of a mono output
(MONO_OUT), a stereo headphone output
(HP_OUT_L/R), and a stereo line-level output
(LINE_OUT_L/R). This section describes the ana-
log hardware needed to interface with these pins.
The designs presented in this section are compliant
with Chapter 17 of Microsoft’s
sign Guide [7] (referred to as PC 99) and Chapter
11 of Microsoft’s
[8] (referred to as PC 2001). For information on
EMI reduction techniques refer to the application
note AN165: CS4297A/CS4299 EMI Reduction
Techniques [5].
10.1 Analog Inputs
All analog inputs to the CS4202, including CD_C,
should be capacitively coupled to the input pins.
Unused analog inputs should be tied together and
connected through a capacitor to analog ground or
tied to the Vrefout pin directly. The maximum al-
lowed voltage for analog inputs, except the micro-
phone input, is 1 V
voltage for the microphone input depends on the
selected boost setting.
10.1.1 Line Inputs
Figure 18 shows circuitry for a line-level stereo in-
put. Replicate this circuit for the Video and Aux in-
puts. This design attenuates the input by 6 dB,
bringing the signal from the PC 99 specified
2 V
10.1.2 CD Input
The CD line-level input has an extra pin, CD_C,
providing a pseudo-differential input for both
50
RMS
DESCRIPTION
, to the CS4202 maximum allowed 1 V
inputs
®
PC 2001 System Design Guide
RMS
(LINE_L/R,
. The maximum allowed
®
PC 99 System De-
CD_L/C/R,
RMS
.
CD_L
common-mode noise out of the CD inputs when
connected to the CD analog source ground. Follow-
ing the reference design in Figure 19 provides extra
attenuation of common mode noise coming from
the CD-ROM drive, thereby producing a higher
quality signal. One percent resistors are recom-
mended since closely matched resistor values pro-
vide better common-mode attenuation of unwanted
signals. The circuit shown in Figure 19 can be used
for a 1 V
10.1.3 Microphone Inputs
Figure 20 illustrates an input circuit suitable for dy-
namic and electret microphones. Electret, also
known as phantom-powered, microphones use the
right channel (ring) of the jack for power. The de-
sign also supports the recommended advanced fre-
quency response for voice recognition as specified
in PC 99 and PC 2001. The microphone input of the
CS4202 has an integrated pre-amplifier. Using
combinations of the 10dB bit in the Misc. Crystal
Control Register (Index 60) and the 20dB bit in the
Figure 18. Line Input (Replicate for Video and AUX)
CD_COM
CD_R
CD_L
Figure 19. Differential 1 V
RMS
and
AGND
CD input signal.
100 Ω
100 Ω
100 Ω
6.8 kΩ
6.8 kΩ
CD_R.
47 kΩ
6.8 kΩ
47 kΩ
AGND
AGND
This
1.0 µ F
1.0 µ F
47 kΩ
6.8 kΩ
RMS
1.0 µ F
1.0 µ F
pin
CD Input
2.2 µ F
LINE_IN_R
LINE_IN_L
CS4202
takes
DS549PP2
CD_R
CD_L
CD_C
the