CS42L55 Datasheet, PDF (15/73 Pages) Cirrus Logic – Ultra Low Power, Stereo CODEC w/Class H Headphone Amp

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 kΩ, C_L = 150 pF (see Figure 3 on
page 15).
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
16-Bit
A-weighted ⁹³
99
unweighted 90
96
A-weighted ^-
96
unweighted ^-
93
-
91
97
-
dB
-
88
94
-
dB
-
-
94
-
dB
-
-
91
-
dB
Total Harmonic Distortion + Noise
18 to 24-Bit
16-Bit
Full-scale Output Voltage (Note 13)
Other Characteristics
0 dB
-
-20 dB ^-
-60 dB ^-
0 dB -
-20 dB ^-
-60 dB ^-
-84
-78
-
-86
-80
dB
-76
-
-
-74
-
dB
-36
-30
-
-34
-28
dB
-82
-
-
-84
-
dB
-74
-
-
-72
-
dB
-34
-
-
-32
-
dB
1.50•VA 1.58•VA 1.66•VA 1.50•VA 1.58•VA 1.66•VA V_PP
Interchannel Isolation
-
90
-
-
90
-
dB
Interchannel Gain Mismatch
-
Output Offset Voltage (Note 14) DAC to LINEOUT _-
Gain Drift
-
Output Impedance
-
AC-Load Resistance (R_L)
(Note 14) ³
Load Capacitance (C_L)
(Note 14) ^-
0.1
0.25
0.5
1.0
±100
-
100
-
-
-
-
150
-
0.1
0.25
dB
-
0.2
1.0
mV
-
±100
- ppm/°C
-
100
-
Ω
3
-
-
kΩ
-
-
150
pF
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.
HPOUTx
HPREF
GND/AGND
Test Load
33 Ω
0.1 μF
CL=150 pF
RL=16 Ω or
3 kΩ
L IN E O U T x
L IN E R E F
G N D /A G N D
Test Load
CL=150 pF
RL=3 kΩ
Mea- surem+ ent
Device
Figure 3. HP Output Test Configuration
DS773F1
-
+
M easurem ent
D e v ic e
Figure 4. Line Output Test Configuration
15