CRD4412 Cirrus Logic, Inc., CRD4412 Datasheet - Page 20

• Manufacturer Part Number: CRD4412
• Description: 60 W Quad Half-bridge Digital Amplifier Power Stage
• Manufacturer: Cirrus Logic, Inc.

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6. POWER SUPPLY, GROUNDING, AND PCB LAYOUT
The CS44130 requires a 3.3 V or 5.0 V digital power supply for the core logic. In order to support a number of PWM
frontend solutions, a separate VL power pin is provided to condition the interface signals to support up to 5.0 V lev-
els. The VL power pins control the voltage levels for all PWM input, mode, and error reporting signals.
Extensive use of power and ground planes, ground plane fill in unused areas and surface mount decoupling capac-
itors are recommended. It is necessary to decouple the power supply by placing capacitors directly between the
power and ground of the CS44130. The recommended procedure is to place a 0.1 µF capacitor as close as physi-
cally possible to each power pin. Decoupling capacitors should be as near to the pins of the CS44130 as possible,
with the low value ceramic capacitor being the nearest and should be mounted on the same side of the board as the
CS44130 to minimize inductance effects
7. PARAMETER DEFINITIONS
Dynamic Range (DR)
Frequency Response (FR)
Interchannel Isolation
FFT
Fs
Signal to Noise Ratio (SNR)
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 20 Hz to 20 kHz. Dynamic Range is a signal-to-noise ratio measurement over the spec-
ified band width made with a -60 dBFS signal. 60 dB is then added to the resulting measurement to refer
the measurement to full-scale, with units in dBFS. This measurement can be made “weighted” or “un-
weighted”. The weighting that was used during for the test is usually indicated by a letter following the units.
For instance, “dBFS A” would indicate that an A-weighted filter was used during testing.
This technique ensures that the distortion components are below the noise level and do not effect the mea-
surement. This measurement technique has been accepted by the Audio Engineering Society, AES17-
1991, and the Electronic Industries Association of Japan, EIAJ CP-307.
FR is the deviation in signal level versus frequency. The 0 dB reference point is 1 kHz. The amplitude cor-
ner, Ac, lists the maximum deviation in amplitude above and below the 1 kHz reference point. The listed
minimum and maximum frequencies are guaranteed to be within the AC from minimum frequency to maxi-
mum frequency inclusive.
A measure of crosstalk between the left and right channels. 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. Units in deci-
bels.
Fast Fourier Transform.
Sampling Frequency.
SNR, similar to DR, is the ratio of an arbitrary sinusoidal input signal to the RMS sum of the noise floor, in
the presence of a signal. It is measured over a 20 Hz to 20 kHz bandwidth with units in dB.
The ratio of the rms value of the signal to the rms sum of all other spectral components over the specified
band width (typically 10 Hz to 20 kHz), including distortion components. Expressed in %.
CS44130
DS690PP1