Cirrus Logic CS42L56 - Manual (Page 26)

26 DS851F2
CS42L56
DC CHARACTERISTICS
Test Conditions (unless otherwise specified): Connections to the CS42L56 are shown in the “Typical Connection Diagrams” on
page 11 ; GND = AGND = 0 V; all voltages with respect to ground.
Notes:
27. No load connected to HPOUTx and LINEOUTx.
28. VA = 2.71 V, BIAS_LVL[1:0] = 00, total equivalent external impedance to ground = 2 k
.
29. Valid with the recommended capacitor values on FILT+ and VQ, no load on HP and Line. Increasing
the capacitance on FILT+ and VQ will also increase the PSRR.
30. The PGA is biased with VQ, created by a resistor divider from the VA supply. Increasing the capacitance
on FILT+ and VQ will also increase the PSRR at low frequencies. A 10 µF capacitor on VQ improves
the PSRR to 42 dB.
Parameters Min Typ Max Units
VHPFILT Characteristics (Note 27)
VCP Mode +VHPFILT
-VHPFILT
-
- VCP
-VCP
-
- V
V
VCP/2 Mode +VHPFILT
-VHPFILT
-
- VCP/2
-VCP/2
-
- V
V
MIC BIAS Characteristics
Nominal Voltage
BIAS_LVL[1:0] = 00
BIAS_LVL[1:0] = 01
BIAS_LVL[1:0] = 10
BIAS_LVL[1:0] = 11
-
-
-
- 0.9•VA
0.8•VA
0.7•VA
0.6•VA -
-
-
- V
V
V
V
DC Output Current (Note 28) - - 1.22 mA
Power Supply Rejection Ratio (PSRR) @ 1 kHz BIAS_LVL[1:0] = 00
BIAS_LVL[1:0] = 01
BIAS_LVL[1:0] = 10
BIAS_LVL[1:0] = 11
-
-
-
- 45
50
50
50 -
-
-
- dB
dB
dB
dB
Misc. DC Filter Characteristics
FILT+
VQ
VDFILT
-
-
- VA
VA/2
0.9
-
-
- V
V
V
Power Supply Rejection Ratio (PSRR) Characteristics
PSRR with 100 mVpp, 1 kHz signal
(Note 29) PGA to ADC
PGA (Pseudo Differential) to ADC
ADC
PGA to HP & Line Amps
PGA (Pseudo Differential) to HP & Line Amps
DAC to HP & Line Amps
-
-
-
-
-
- 47
58
57
44
54
56 -
-
-
-
-
- dB
dB
dB
dB
dB
dB
PSRR with 100 mVpp, 60 Hz signal (Notes 29 , 30 ) PGA to ADC
ADC
PGA to HP & Line Amps
DAC to HP & Line Amps
-
-
-
- 35
25
50
60 -
-
-
- dB
dB
dB
dB