Cirrus Logic CS42L73 User Manual
Page 32
32
DS882F1
CS42L73
SERIAL PORT TO MONO SPEAKERPHONE LINE OUTPUT CHARACTERISTICS
Test conditions (unless otherwise specified): Connections to the CS42L73 are shown in the
“Typical Connection Diagram” on
; 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, VP = 3.70 V; T
A
= +25
C; Mea-
surement Bandwidth is 20 Hz to 20 kHz; Fs = 48 kHz
; ASP is used and is in slave mode with Fs
ext
= 48 kHz; test load-
ing is configured as per
(R
L
, C
L1
, and C
L2
as indicated in the table below for R
L(Typ)
, C
L1(Max)
, and
C
L2(Max)
); Mixer Attenuation = 0 dB, Digital Mute is disabled.
Notes:
45. The full-scale output voltage includes attenuation due to the Speakerphone Line Output Resistance (R
OUT
).
46. The specified output resistance is present on each of the SPKLINEO pins.
Parameters
Min
Typ
Max
Units
Digital Volume = -5.5 dB
Dynamic Range
16 to 24-Bit
A-weighted
unweighted
78
75
84
81
-
-
dB
dB
Total Harmonic Distortion + Noise
, 16 to 24-Bit
0 dBFS
-
-65
-60
dB
Full-scale Output Voltage
(Diff. SPKLINEO±, see
) 2.97•VA
3.21•VA
3.45•VA
V
PP
Other Characteristics
Output Offset Voltage
(DC offset of diff. SPKLINEO±, see
)
-
±5.0
±10.0
mV
Gain Drift
-
±100
-
ppm/°C
Output Resistance (R
OUT
)
-
100
-
Load Resistance (R
L
3
50
-
k
Load Capacitances
C
L1
across outputs/load
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
20 kHz
-
-
-
70
70
70
-
-
-
dB
dB
dB
PSRR with 100 mV
PP
signal AC-coupled to VP supply
217 Hz
–Input test signal held low (all zeros data)
1 kHz
20 kHz
-
-
-
70
80
75
-
-
-
dB
dB
dB
Test Load
SPKOUT+
or SPKLINEO+
PGND/AGND
R
L
SPKOUT-
or SPKLINEO-
C
L2
C
L2
C
L1
Measurement
Device
-
+
Figure 8. Speakerphone and Speakerphone Line Output Test Configuration