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參數(shù)資料
| 型號： | LC78625E |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | QFP-80 |
| 文件頁數(shù)： | 18/35頁 |
| 文件大小： | 535K |
| 代理商： | LC78625E |
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19. One-bit D/A converter
The LC78625E PWM block outputs a single data value in the range –3 to +3 once every 64fs period. To reduce
carrier noise, this block adopts an output format in which each data switching block is adjusted so that the PWM
output level does not invert. Also, the attenuator block detects 0 data and enters muting mode so that only a 0 value (a
50% duty signal) is output.
This block outputs a positive phase signal to the LCHP (RCHP) pin and a negative phase signal to the LCHN
(RCHN) pin. High-quality analog signals can be acquired by taking the differences of these two output pairs using
external low-pass filters.
The LC78625E includes built-in extraneous radiation suppression resistors (1 k
) in each of the LCHP/N and
RCHP/N pins.
PWM output format
PWM output example
20. CD-ROM outputs; Pin 42: LRSY, pin 43: CK2, pin 44: ROMXA, pin 45: C2F
Although the LC78625E is initially setup to output audio data from the interpolation circuit MSB first from the
ROMXA pin in synchronization with the LRSY signal, the circuit can be switched to output CD-ROM data by
issuing a CD-ROM XA command. Since this data has not been processed by the interpolation, muting, and other
digital circuits, it is appropriate for input to a CD-ROM encoder LSI. CK2 is a 2.1168 MHz clock, and data is output
on the CK2 falling edge. However, this clock polarity can be inverted by issuing a CK2 polarity inversion command.
C2F is the flag information for the data in 8-bit units. Note that the CD-ROM XA reset command has the same
function as the CONT pin (pin 73). The one-bit D/A converter switches to muted mode when a CD-ROMXA
command is input.
No. 5502-25/35
LC78625E
Code
COMMAND
RES = L
$88
CD-ROMXA
$8B
CONT and CD-ROM XA reset
●
$C9
CK2 polarity inversion
LC78625E CD-ROM encoder LSI (LC895XX) interface
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