CS42L56 datasheet(13/92 Pages) CIRRUS

13 / 92 page

DS851F2

CS42L56

Note 1

Note 2

2.2 µF

Note 1

1 µF

GND/Thermal Pad

0.1 µF

+1.65 V to +3.63 V

RESET

LRCK

MCLK

SCLK

2.2 µF

+VHPFILT

VDFILT

LINEREF

SDIN

SDOUT

AIN1A

1800 pF

100 k



100



AIN1B

Digital Audio

Processor

FLYC

FLYN

-VHPFILT

2.2 µF

1 µF

100 k



100



2.2 µF **

VCP

LINEOUTA

LINEOUTB

0.1 µF

+1.65 V to +2.75 V

0.1 µF

VLDO

2.2 µF

AGND

NPO /C0G dielectric capacitors.

1000 pF

AFILTA

AFILTB

1000 pF

2.2 µF

HPOUTB

HPOUTA

Headphone Out

Left & Right



0.1 µF

HPDETECT



0.1 µF

47 k



HPREF

FILT+

+1.65 V to +2.75 V

FLYP

2.2 µF **

Note 1

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 X7 R/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/X5 R 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. The value of RL, a current-limiting resistor used with electret condenser microphones, is dictated by the microphone

cartridge.

6. The negative terminal of the microphone inputs connects to the ground pin of the microphone cartridge. Gain is applied only

to the positive terminal.

Note 4

Note 3

Low ESR, X7R/X5R dielectric capacitors.

562



562



3300 pF

Rext

LPF is Optional

Line Level Out

Left & Right

3300 pF

SCL\CCLK

SDA\CDIN

AD0\CS

AIN2A

1800 pF

100 k



100



AIN2B

1 µF

100 k



100



Note 4

Microphone 1

MICBIAS

1 µF

AIN3A

AIN3B

Microphone 2

1 µF

Note 5

Note 6

Left Analog

Input 1

Right Analog

Input 1

Left Analog

Input 2

Right Analog

Input 2

TSTN

Figure 3. Typical Connection Diagram - Six Single-Ended Analog Inputs

CS42L56

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. The value of RL, a current-limiting resistor used with electret condenser microphones, is dictated by the microphone cartridge.

6. The negative terminal of the microphone inputs connects to the ground pin of the microphone cartridge. Gain is applied only to the positive terminal.

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