Cirrus Logic CS42L73 - Manual (Page 134)

134 DS882F1
CS42L73
9. PARAMETER DEFINITIONS
Dynamic Range
The ratio of the rms value of the signal to the rms sum of all other spectral components over the specified
bandwidth. Dynamic range is a signal-to-noise ratio measurement over the specified band width made with
a -60 dB signal. 60 dB is added to resulting measurement to refer the measurement to full-scale. This tech-
nique ensures that the distortion components are below the noise level and do not affect the measurement.
This measurement technique has been accepted by the Audio Engineering Society, AES17-1991, and the
Electronic Industries Association of Japan, EIAJ CP-307. Dynamic range is expressed in decibel units.
Frequency Response
A measure of the amplitude response variation from 10 Hz to 20 kHz relative to the amplitude response at
1 kHz. Frequency Response is expressed in decibel units.
Gain Drift
The change in gain value with temperature, expressed in ppm/°C units.
Interchannel Gain Mismatch
The gain difference between left and right channel pairs. Interchannel Gain Mismatch is expressed in deci-
bel units.
Interchannel Isolation
A measure of crosstalk between the left and right channel pairs. Interchannel Isolation is measured for each
channel at the converter's output with no signal to the input under test and a full-scale signal applied to the
other channel. Interchannel isolation is expressed in decibel units.
Load Resistance and Capacitance
The recommended minimum resistance and maximum capacitance required for the internal op-amp's sta-
bility and signal integrity. The load capacitance effectively moves the band-limiting pole of the amp in the
output stage. Increasing the load capacitance beyond the recommended value can cause the internal
op-amp to become unstable.
Offset Error
The deviation of the mid-scale transition (111...111 to 000...000) from the ideal.
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 the line amplifier, the line amplifier is ON while the headphone amplifier is OFF;
when measuring the offset out the headphone amplifier, the headphone amplifier is ON while the line am-
plifier is OFF.
Total Harmonic Distortion + Noise (THD+N)
The ratio of the unweighted 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 dBFS for the analog input and 0 dB for the analog output as suggested in AES17-1991 Annex A. THD+N
is expressed in decibel units.