| 摘要 |
Adjustment data of first and second tracking adjustment circuits 11 and 12 are set in latch circuits 21 and 22. The plurality of pieces of adjustment data latched by the latch circuits 21 and 22 are respectively output to one D/A converter 41 at different time intervals. The data are converted into a direct current control voltage in the D/A converter 41, and the control voltage is respectively held by voltage holding circuits of the first tracking adjustment circuit 11 and the second tracking adjustment circuit 12, and a tuning frequency is adjusted. After an optimum tuning frequency is obtained, the tuning data at that time is written to a nonvolatile memory within an IC, and the control voltage is supplied to each tuning circuit based on the tuning data stored in the nonvolatile memory. <IMAGE>
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