Cirrus Logic CS42L73 - Manual (Page 26)

26 DS882F1
CS42L73
MIC BIAS CHARACTERISTICS
Test Conditions (unless otherwise specified): Connections to the CS42L73 are shown in the “Typical Connection Diagram” on
page 17 ; GND = AGND = PGND = CPGND = DGND = 0 V; all voltages are with respect to ground (GND); VA = 1.80 V, VP =
3.70 V; T
A
= +25 C; I
OUT
= 500 A; only one bias output is powered up at a time; VP_MIN = 1b, MIC_BIAS_CTRL = 1b.
Notes:
27. The output voltage includes attenuation due to the Mic Bias Output Resistance (R
OUT
).
28. Specifies use limits for the normal operation and MIC2 short conditions.
29. Dropout Voltage indicates the point where an output’s voltage starts to vary significantly with reductions to its supply
voltage. When the VP supply voltage drops below the programmed MIC2_BIAS output voltage plus the Dropout Volt-
age, the MIC2_BIAS output voltage will progressively decrease as its supply decreases. Dropout Voltage is measured
by reducing the VP supply until MIC2_BIAS drops 10 mV from its initial voltage with the default typical test condition VP
voltage (= 3.80 V from table heading above). The difference between the VP supply voltage and the MIC2_BIAS voltage
at this point is the dropout voltage. For instance, if the initial MIC2_BIAS output is 2.86 V when VP = 3.80 V and VP =
3.19 V when MIC2_BIAS drops to 2.85 V (-10mV), the Dropout Voltage is 340 mV (3.19 V – 2.85 V).
Parameters (Note 2) Min Typ Max Units
MIC1_BIAS and MIC2_BIAS Characteristics
Output Voltage (Note 27) MIC_BIAS_CTRL = 0b
MIC_BIAS_CTRL = 1b 1.85
2.59 2.00
2.75 2.15
2.89 V
V
DC Output Current (I
OUT
) Per output
(Note 28) Total for both outputs
-
- -
- 3.0
5.0 mA
mA
Output Resistance (R
OUT
) - 35 - 
Dropout Voltage (Note 29) - - 340 mV
PSRR with 100 mV
PP
signal AC-coupled to VA supply
217 Hz
1 kHz
20 kHz
-
-
- 105
100
90
-
-
- dB
dB
dB
PSRR with 100 mV
PP
signal AC-coupled to VP supply
VP_MIN = 0b, VP = 3.10 V (Note 3) 217 Hz
1 kHz
20 kHz
PSRR with 1 V
PP
signal AC-coupled to VP supply
VP_MIN = 1b, VP = 3.70 V 217 Hz
1 kHz
20 kHz
-
-
-
-
-
-
90
90
70
110
105
90
-
-
-
-
-
-
dB
dB
dB
dB
dB
dB