CS42L55 Datasheet, PDF (10/73 Pages) Cirrus Logic – Ultra Low Power, Stereo CODEC w/Class H Headphone Amp

2. TYPICAL CONNECTION DIAGRAM
CS42L55
1 µF _**
** ^{0.1 µF} ** ^{0.1 µF}
+1.65 V to +2.71 V
2.2 µF ^**
+1.65 V to +2.71 V
Note 1
2.2 µF _**
Note 2
2.2 µF _**
2.2 µF _**
Note 1
2.2 µF _**
Digital Audio
Processor
VDFILT VLDO
+VHPFILT
VA
47 kΩ
HPREF
HPOUTB
0.1 µF
** _{33 Ω}
VCP
HPOUTA _{** 33 Ω}
0.1 µF
HPDETECT
CS42L55
FLYP
FLYC
FLYN
-VHPFILT
LINEOUTA
LINEREF
LINEOUTB
562 Ω
3300 pF
*
LPF is Optional
562 Ω
*3300 _pF
Headphone Out
Left & Right
Rext
Line Level Out
Left & Right
Rext
MCLK
SCLK
LRCK
SDIN
SDOUT
RESET
SCL
SDA
AIN1A
AIN1REF
AIN1B
Note 4
1 µF
1800 pF _*
**
*
1800 pF
**
100 Ω
1 µF
** 100 Ω
1 µF
100 kΩ
100 kΩ
Analog
Input 1
AIN2A
AIN2REF
AIN2B
1 µF
1800 pF _*
**
*
1800 pF
**
1 µF
100 Ω
** 100 Ω
1 µF
100 kΩ
100 kΩ
Note 5
Analog
Input 2
+1.65 V to +3.47 V
2 kΩ
2 kΩ
**
0.1 µF
AGND
VL
AFILTA
AFILTB
VQ
FILT+
GND/Thermal Pad
Note 3
*
*
1000 pF 1000 pF
**
2.2 µF
**
2.2 µF
* NPO/C0G dielectric capacitors.
** _{Low ESR, X7R/X5R dielectric capacitors.}
Notes:
1. The headphone amplifier’s output power and distortion are rated using the nominal capacitance shown. Larger capacitance
reduces the ripple on the internal amplifiers’ supplies and in turn reduces the amplifier’s distortion at high output power levels.
Smaller capacitance may not sufficiently reduce ripple to achieve the rated output power and distortion. Since the actual value
of typical X7R/X5R ceramic capacitors deviates from the nominal value by a percentage specified in the manufacturer’s data
sheet, capacitors should be selected based on the minimum output power and maximum distortion required.
2. The headphone amplifier’s output power and distortion are rated using the nominal capacitance shown and using the default
charge pump switching frequency. The required capacitance follows an inverse relationship with the charge pump’s switching
frequency. When increasing the switching frequency, the capacitance may decrease; when lowering the switching frequency,
the capacitance must increase. Since the actual value of typical X7R/X5R ceramic capacitors deviates from the nominal value
by a percentage specified in the manufacturer’s data sheet, capacitors should be selected based on the minimum output
power, maximum distortion and maximum charge pump switching frequency required.
3. Additional bulk capacitance may be added to improve PSRR at low frequencies.
4. These capacitors serve as a charge reservoir for the internal switched capacitor ADC modulators and should be placed as
close as possible to the inputs. They are only needed when the PGA (Programmable Gain Amplifier) is bypassed.
5. Input pairs (such as AIN2A, AIN2REF and AIN2B) may be left floating if they are not used.
Figure 1. Typical Connection Diagram
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DS773F1