Crown XLS 1000 Series, Service Manual

Page: 10 / 94

ANALOG OUTPUTS:
The output of the APM is driven by a differential gain stage (U701-C,D) that receives
its input from the DAC. In the case of the XLS1000, the DAC resides within the TI
DSP (CH2±_DSP_DA), while in the case of the XLS1500 – 2500, the DAC is part of
the Cirrus codec (CH2±_DA). This gain stage matches the output of the DAC to the
amplifier’s input requirement of 5.66Vrms to drive the amplifier’s output to full rated
power.
DIGITAL PROCESSING:
The TAS3202 is an integrated converter and DSP that provides all of our signal
processing at an affordable cost. The IC is powered from +3.3V and uses ~200mA.
Clock Generation:
The amplifier runs from a single clock that is generated by the TAS3202 (U703)
using the 24.576MHz crystal, Y700. This clock is divided by 2 internally by the
DSP and sent to the microprocessor (MCLK_UP) and Cirrus codec
(MCLK_CODEC). The fundamental clock is divided internally in the DSP to
768KHz and sent to Divide-by-2 (U704-B) to provide differential 384KHz to the
MAIN board’s Ruby PWM IC and the 384KHz is then divided by U704-A to
provide 192KHz to the MAIN SMPS via J700.
Digital Audio: