CDB6420 Просмотр технического описания (PDF) - Cirrus Logic

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CDB6420

Full-Duplex Speakerphone Chip

Cirrus Logic 

CS6420

ANALOG TRANSMISSION CHARACTERISTICS (TA = 25°C, DVDD = AVDD = 5V, fXTAL =

20.480 MHz, RVol=TVol=RGain=TGain= 0 dB, HD=TSD=RSD=1, analog inputs and ouputs loaded with resistors

and capacitors as shown in the typical connection diagram, Figure 2)

Parameter

Symbol Min Typ Max Units

Idle Channel Noise

(Inputs grounded

through a capacitor)

A-weighted (0-20 kHz)

C-Message weighted (0-4 kHz)

Psophometrically weighted (0-4 kHz)

-69

dBV

17

dBrnC0

-67

dBm0p

Signal-to-Noise Ratio

A-weighted (0-20 kHz)

(Full Scale, 1 kHz

C-Message weighted (0-4 kHz)

sine wave input)

Psophometrically weighted (0-4 kHz)

SNR

69

17

-67

dB

dBrnC0

dBm0p

Total Harmonic Distortion C-Message Weighted (0-4 kHz) THD

0.1

%

Programmable Gain

RGain/TGain = 00

RGain/TGain = 01

RGain/TGain = 10

RGain/TGain = 11

0

dB

6

9.5

12

Volume Control Stepsize (TVol/RVol)

3

dB

ADC Full-scale Voltage Input

0.9

1.0

Vrms

DAC Full-scale Voltage Output

1.0

1.1

Vrms

ADC Noise Floor

C-Message Weighted (0-4 kHz)

-80

dBV

DAC Noise Floor, DAC muted C-Message Weighted (0-4 kHz)

-85

dBV

MICROPHONE AMPLIFIER (TA = 25°C, DVDD = AVDD = 5V,fXTAL = 20.480 MHz)

Parameter

Symbol Min Typ Max

Gain (Zsource = 50Ω)

Amic

34

Signal-to-Noise Ratio

A-weighted (0-20 kHz) SNRm

63

Input Impedance

Zinm

5

Input Offset Voltage

Voffm

2.12

Units

dB

dB

kΩ

V

DIGITAL CHARACTERISTICS (TA = 25°C, DVDD = AVDD = 5V,fXTAL = 20.480 MHz)

Parameter

High-Level Input Voltage

Low-Level Input Voltage

Input Leakage Current

Input Capacitance

Symbol

Min

Typ

VIH

DVDD-1.0

VIL

Ileak

CIN

5

Max

1.0

10

Units

V

V

µA

pF

DS205PP2

5

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