CS6422 Datasheet, PDF (7/48 Pages) Cirrus Logic – Enhanced Full-Duplex Speakerphone IC

CS6422
ANALOG TRANSMISSION CHARACTERISTICS (T_A = -40°C to 85^oC, DVDD = AVDD = 5 V,
f _XTAL =20.480 MHz, RVol=TVol=RGain=TGain= 0 dB, HDD=TSD=RSD=1, analog inputs and outputs loaded with
resistors and capacitors as shown in the typical connection diagram, Figure 4)
Parameter
Symbol Min Typ Max Units
Idle Channel Noise
(Inputs grounded
through a capacitor)
C-Message weighted (0-4 kHz)
C-Message weighted (0-4 kHz)
Psophometrically weighted (0-4 kHz)
-80
-72
dBV
11
dBrnC0
-78
dBm0p
Signal-to-Noise Ratio
C-Message weighted (0-4 kHz) SNR
72
80
dB
(1.0 V_rms, 1 kHz sine wave input)
Total Harmonic Distortion C-Message weighted (0-4 kHz) THD
(1.0 V_rms, 1 kHz sine wave input)
0.030 0.1
%
Programmable Analog 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
DAC Full-scale Voltage Output
ADC Noise Floor
C-Message weighted (0-4 kHz)
0.9
1.0
1.0
1.2
-83
V_rms
V_rms
dBV
DAC Noise Floor, DAC muted C-Message weighted (0-4 kHz)
-83
dBV
MICROPHONE AMPLIFIER (T_A = 25°C, DVDD = AVDD = 5 V, f_XTAL = 20.480 MHz)
Parameter
Symbol Min Typ Max
Gain (Z_source = 50Ω)
A_mic
34
Signal-to-Noise Ratio
C-Message weighted (0-4 kHz) SNRm
70
Input Impedance
Input Offset Voltage
Z_inm
V_offm
8
2.12
Units
dB
dB
kΩ
V
DIGITAL CHARACTERISTICS (T_A = 25°C, DVDD = AVDD = 5 V,f_XTAL = 20.480 MHz)
Parameter
High-Level Input Voltage
Low-Level Input Voltage
Input Leakage Current
Input Capacitance
Symbol
Min
Typ
V_IH
DVDD-1.0
V_IL
I_leak
C_IN
5
Max
1.0
10
Units
V
V
µA
pF
DS295F1
7