Cirrus Logic CS42L73 - Manual (Page 30)

30 DS882F1
CS42L73
SERIAL PORT TO MONO EAR SPEAKER OUTPUT CHARACTERISTICS
Test conditions (unless otherwise specified): Connections to the CS42L73 are shown in the “Typical Connection Diagram” on
page 17 ; Input test signal is a 24-bit full-scale 997 Hz sine wave with 1 LSB of triangular PDF dither applied; GND = AGND =
PGND = CPGND = DGND = 0 V; all voltages are with respect to ground (GND); VA = 1.80 V; T
A
= +25 C; Measurement Band-
width is 20 Hz to 20 kHz; Fs = 48 kHz (Note 10) ; ASP is used and is in slave mode with Fs
ext
= 48 kHz; test loading is configured
as per Figure 7 on page 30 (R
L
, C
L1
, and C
L2
as indicated in the table below for R
L(Min)
, C
L1(Max)
, and C
L2(Max)
); Mixer Attenua-
tion = 0 dB, Digital Volume = -2.5 dB, Digital Mute is disabled.
Notes:
39. Modifying internal gain settings to achieve a higher peak-to-peak voltage may result in clipping the analog output signal,
degrading the THD+N performance.
40. Differential peak-to-peak voltage is measured from the extremes (peaks) of the waveform that represents the difference
between the positive and negative signals of the differential pair [i.e. the voltage between the maximum and minimum
of V
Diff
(= V
+
– V
-
)].
41. Refer to Figure 7 on page 30 and Figure 8 on page 32 to observe Ear-Speaker, Speakerphone, and Speakerphone
Line-Output test configurations.
Parameters (Note 2) Min Typ Max Units
Dynamic Range
16 to 24-Bit
A-weighted
unweighted
82
79 88
85 -
- dB
dB
Total Harmonic Distortion + Noise (Note 39) , 16 to 24-Bit
0 dBFS, P
OUT
= 45 mW - -70 -65 dB
Full-scale Output Voltage (Note 39) (Diff. EAROUT ±, see Note 40 ) 1.24•VA 1.34•VA 1.44•VA V
PP
Output Power (Full-scale) (P
OUT
) (Note 39)
THD+N -65 dB (0.056%) Dig. Vol. = -2.5 dB
THD+N -60 dB (0.1%) Dig. Vol. = -2.0 dB
THD+N -40 dB (1%) Dig. Vol. = -1.5 dB
THD+N -20 dB (10%) Dig. Vol. = -0.5 dB
-
-
-
- 45
51
56
66 -
-
-
- mW
mW
mW
mW
Other Characteristics
Output Offset Voltage
(DC offset of diff. EAROUT ±, see Note 40 ) - ±2.5 ±4.0 mV
Gain Drift - ±100 - ppm/°C
Load Resistance (R
L
) (Note 41) 16 - - 
Load Capacitances C
L1
across outputs
(Note 41) C
L2
from each output to ground
-
- -
- 150
50
pF
pF
PSRR with 100 mV
PP
signal AC-coupled to VA supply 217 Hz
- Input test signal held low (all zeros data) 1 kHz
(Note 36) 20 kHz
-
-
- 70
70
70 -
-
- dB
dB
dB
Test Load
EAROUT+
AGND
R
L
EAROUT-
C
L2
C
L2
C
L1
Measurement
Device
-
+
Figure 7. Ear Speaker Output Test Configuration