Cirrus Logic CS42L55 - Manual (Page 15)

DS773F1 15
CS42L55
LINE OUTPUT CHARACTERISTICS
Test conditions (unless otherwise specified): Connections to the CS42L55 are shown in the “Typical Connection Diagram” on
page 10 ; Input test signal is a full-scale 997 Hz sine wave; All Supplies = VA, VCP Mode; GND = AGND = 0 V; T
A
= +25 °C;
Measurement bandwidth is 20 Hz to 20 kHz; Sample Frequency = 48 kHz; Test load R
L
= 3 k Ω, C
L
= 150 pF (see Figure 3 on
page 15 ).
Notes:
11. One-half LSB of triangular PDF dither is added to data.
12. The Analog Gain setting (refer to “Headphone Volume Control” on page 57 or “Line Volume Control” on
page 58 ) must be configured as indicated to achieve the specified output characteristics. High gain set-
tings at certain VA and VCP supply levels may cause clipping when the audio signal approaches full-
scale, maximum power output.
13. VCP settings lower than VA reduces the headroom of the headphone amplifier. As a result, the speci-
fied THD+N performance at full-scale output voltage and power may not be achieved.
14. See Figure 3 and Figure 4 on page 15 . Refer to “Parameter Definitions” on page 71 .
VA = 2.5 V VA = 1.8 V
Parameter (Note 11) Min Typ Max Min Typ Max Unit
(+2 dB Analog Gain)
(Note 12)
Dynamic Range
18 to 24-Bit A-weighted
unweighted
16-Bit
A-weighted
unweighted
93
90
-
-
99
96
96
93 -
-
-
- 91
88
-
-
97
94
94
91 -
-
-
- dB
dB
dB
dB
Total Harmonic Distortion + Noise
18 to 24-Bit 0 dB
-20 dB
-60 dB
16-Bit 0 dB
-20 dB
-60 dB
-
-
-
-
-
- -84
-76
-36
-82
-74
-34 -78
-
-30
-
-
-
-
-
-
-
-
- -86
-74
-34
-84
-72
-32 -80
-
-28
-
-
-
dB
dB
dB
dB
dB
dB
Full-scale Output Voltage (Note 13) 1.50•VA 1.58•VA 1.66•VA 1.50•VA 1.58•VA 1.66•VA V
PP
Other Characteristics
Interchannel Isolation - 90 - - 90 - dB
Interchannel Gain Mismatch - 0.1 0.25 - 0.1 0.25 dB
Output Offset Voltage (Note 14) DAC to LINEOUT - 0.5 1.0 - 0.2 1.0 mV
Gain Drift - ±100 - - ±100 - ppm/°C
Output Impedance - 100 - - 100 - Ω
AC-Load Resistance (R
L
) (Note 14) 3 - - 3 - - k Ω
Load Capacitance (C
L
) (Note 14) - - 150 - - 150 pF
T est Load
LIN E O U Tx
G N D /A G N D
C L =150 pF
LIN E R E F
R L =3 k Ω
M easurem ent
D evice
- +
Test Load
HPOUTx
GND/AGND
C L =150 pF
0.1 μF
33 Ω
HPREF
R L =16 Ω or
3 k Ω
Measurement
Device
- +
Figure 3. HP Output Test Configuration Figure 4. Line Output Test Configuration