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参数资料
| 型号： | LC78681E |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | QFP-64 |
| 文件页数： | 13/23页 |
| 文件大小： | 241K |
| 代理商： | LC78681E |
A clock to serve as a time base can be obtained by connecting a 16.9344 MHz crystal to XIN and XOUT. The OSC OFF
command stops oscillation of the crystal and the VCO. The double-speed mode can also be enabled through the use of
commands. The relationship between the crystal and VCO is shown below.
Recommended crystal oscillator constants
4.2M and 16M Pins (pin 59: 4.2M and pin 58: 16M)
Buffered 16.9344 MHz output from an externally connected 16.9344 MHz crystal is output from 16 M. It is also divided
by four to generate a 4.2336 MHz clock that is output on 4.2 M. When the OSC OFF command has been issued, these
outputs are held either high or low. The same frequency is generated in both normal and double-speed modes.
Reset Circuit (pin 55: RES)
This pin should momentarily be held low after power-on. This is set to –
∞ dB for muting or to STOP for the disc motor.
No. 4521-20/23
LC78681E
VCO playback speed
Mode 8M
Mode 16M
Normal speed mode
Double speed mode
Normal speed mode
Double speed mode
After reset
—
AI pin external input (8M VCO)
8.6436 MHz
AI pin external input (17M VCO)
17.2872 MHz
AI pin external input (LA9210)
8.6436 MHz
17.2872 MHz
PCK monitor output
4.3218 MHz
8.6436 MHz
4.3218 MHz
8.6436 MHz
Manufacturer
Oscillator
Cin/Cout
CITIZEN WATCH CO., LTD.
CSA-309 (16.9344 MHz)
6 pF to 10 pF (Cin = Cout)
Constant linear velocity servo
START
BRAKE
CLV
Muting control
0 dB
–12 db
Q subcode address conditions
Address free
Laser control
ON (low)
(high)
CONT
High
OSC
OFF
Track jump mode
New
Track count mode
Standard
New
Standard
ON
Low
OFF
Address 1
∞
STOP
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