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Measurements
IIS CLK11 NMUTE DAC
22 25 AMPLIFIER
1200 -17
1200 -19
CL96532086_062.eps 080999
Figure 8-33 Keep processor 7202 in reset by forcing pin 7 of connector 1208 to +5V. This puts the processor outputs in tristate. Check the reset at pin 4 of processor 7202 to make sure that the processor is in reset. Now, force port 0-4 pin 33 at 7202 to 0V to set the decoder outputs (SCLK, WCLK, DATA, and CL11). Check the MUTE pin 11 at 7309 : this pin should be low. Connect via an I2S generator I2S-signals to the DAC : Pin 1 at 7309: SLCK. Pin 2 at 7309: WCLK. Pin 3 at 7309: DATA. Connect also the SYSCLK pin 6 at position 7309 to a clock signal of 11.2896 MHz ±100ppm. Generate an I2S signal equivalent with a sine wave of 1kHz at 0dB for both left and right channels. Check if 0.8 VRMS at pins 14 and 16 at location 7209 with a DC of 1.65VDC. Check if 1.7 VRMS ±2 dB at connector pins 1and 3 at location 1209. Force MUTE Pin 11 at 7309 high. Measure again at pins 1 and 3 at location 1209 : both signals should be at -90 dB.
