CS35L32 Datasheet, PDF (49/51 Pages) Cirrus Logic – Boosted Class D Amplifier with Speaker-Protection Monitoring and Flash LED Drivers

CS35L32
9 Parameter Definitions
30
8−Ω, 4.7−μH Load
20
8−Ω, 10−μH Load
8−Ω, 15−μH Load
8−Ω, 33−μH Load
10
−20
−40
−60
0
−80
−10
−100
−20
−120
−30
100
1000
10000
Frequency (Hz)
Figure 8-17. VMON to IMON Phase vs. Frequency @ 1 W—
Fixed-Boost Mode (VBST = 5 V)
Load = 8  + 5 H, 8  + 10 H, 8  + 33 H, 8  + 15 H
1
−20
−140
100
1000
Frequency (Hz)
10000
Figure 8-18. IMON FFT, 1 kHz @ Load = 0.9 W—VBST = 5 V
−40
−60
−80
−100
−120
−140
100
1000
Frequency (Hz)
10000
Figure 8-19. IMON FFT, 1 kHz @ No load—VBST = 5 V
9 Parameter Definitions
MCLK_INT. Internal clock that is either equal to the signal connected to the MCLK (MCLK_EXT) or is equal to
MCLK_EXT/2, depending on the setting of the MCLK divide-by-2 control (MCLKDIV2), described in Section 7.7.
Output offset voltage. Describes the DC offset voltage present at the amplifier’s output when its input signal is in a
Mute State. The offset exists due to CMOS process limitations and is proportional to analog volume settings. When
measuring the offset out of the line amplifier, the line amplifier is ON and the headphone amplifier is OFF; when
measuring the offset out of the headphone amplifier, the headphone amplifier is ON and the line amplifier is OFF.
Signal-to-noise ratio (SNR). The ratio of the RMS value of the output signal, where P_out is equivalent to the specified
output power at THD+N < 1%, to the RMS value of the noise floor with no input signal applied and measured over
the specified bandwidth, typically 20 Hz to 20 kHz. This measurement technique has been accepted by the
Electronic Industries Association of Japan, EIAJ CP–307. Expressed in decibels.
Total harmonic distortion + noise (THD+N). The ratio of the rms value of the signal to the rms sum of all other
spectral components over the specified bandwidth (typically 10 Hz to 20 kHz), including distortion components.
THD+N is measured at –1 and –20 dBFS for the analog input and 0 and –20 dB for the analog output as suggested
in AES17–1991 Annex A. THD+N is expressed in decibel units.
DS963F5
49