0W888-002-XTP ON Semiconductor, 0W888-002-XTP Datasheet - Page 14

• Manufacturer Part Number: 0W888-002-XTP
• Description: DSP BELASIGNA 250 AUDIO 64LFBGA
• Manufacturer: ON Semiconductor
• Series: BelaSigna® 250r
• Type: Floating Pointr

Specifications of 0W888-002-XTP

• Interface: I²C, I²S, PCM, SPI, UART
• Clock Rate: 50MHz
• On-chip Ram: 42kB
• Voltage - I/o: 1.0V, 2.0V
• Voltage - Core: 1.00V, 2.00V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-LFBGA
• Package: 64LFBGA
• Numeric And Arithmetic Format: Fixed-Point
• Ram Size: 16 KB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Non-volatile Memory: -

Audio Inputs
input impedance of each audio input pad (e.g., AI0, AI1,
etc.,) is high (approximately 500 kW); therefore a 10 nF
capacitor is sufficient to decouple the DC bias. This
capacitor and the internal resistance form a first−order
analog high pass filter whose cutoff frequency can be
calculated by f
~30 Hz for 10 nF capacitor. This 10 nF capacitor value
applies when the preamplifier is being used, in other words,
when a non−unity gain is applied to the signals. When the
preamplifier is by−passed, the impedance is reduced; hence,
the cut−off frequency of the resulting high−pass filter could
be too high. In such a case, the use of a 30−40 nF serial
capacitor is recommended.
Architecture Overview
RCore DSP
architecture DSP. It includes efficient normalize and
de−normalize instructions, and support for double precision
operations to provide the additional dynamic range needed
for many applications. All memory locations in the system
The audio input traces should be as short as possible. The
The RCore is a 16−bit fixed−point, dual−Harvard
3dB
(Hz) = 1/(R x C x 2π), which results with
Figure 2. BelaSigna 250 Architecture: A Complete Audio Processing System
http://onsemi.com
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Microphone ground terminals should be connected to the
AGND plane (if present) or share a trace with the input
ground reference voltage pin (AIR) to the star point. Analog
and digital outputs MUST be kept away from microphone
inputs to ensure low noise performance.
Audio Outputs
the direct digital output is used, the trace length of RCVRx+
and RCVRx− should be approximately the same to provide
matched impedances. If the analog audio output is used, the
ground return for the external power amplifier should share
a trace with the output ground reference voltage pin (AOR)
to the star point.
are accessible by the RCore using several addressing modes
including indirect and circular modes. The RCore assumes
master functionality of the system.
RCore DSP Architecture
Keep audio input traces strictly away from output traces.
The audio output traces should be as short as possible. If
Figure 3 illustrates the architecture of the RCore.