LA1650 查看數據表（PDF） - SANYO -> Panasonic

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LA1650

Time Code Reception ICs

SANYO -> Panasonic 

LA1650, 1650C

The following three techniques are practical test procedures. Note that since the output from the LA1650 pin 16 is

inverted from the value of the time code, an inverter must be inserted between the output and the microcontroller.

• Continuously output a signal with the value 1 (fc = 40 kHz, AM modulation (90%), fm = 1 Hz (square wave, duty =

50%)) and read out the value 1 from the LA1650. Then, lower the signal generator level until the LA1650 can no

longer correctly output the 1 level. The minimum signal generator level at which correct reception occurs is the

sensitivity.

When monitoring the LA1650 output signal with a microcontroller, monitor the output pulse width for the range listed

in table 1. The output signal should be observed to be a 1 Hz signal, with a period of 1000 ±25 ms. (See figure 3.)

Table 1 Signal Value 1 Range

Item

Output pulse width

(500 ms input)

min typ max unit

480 500 650 ms

TCO rise (reference)

1000 ±25 ms

480 to 650 ms

A12777

Figure 3 Time Code Value 1 Signal Output

• Continuously output a signal with the value 0 (fc = 40 kHz, AM modulation (90%), fm = 1 Hz (square wave, duty =

80%)) and read out the value 0 from the LA1650. Then, lower the signal generator level until the LA1650 can no

longer correctly output the 0 level. The minimum signal generator level at which correct reception occurs is the

sensitivity.

When monitoring the LA1650 output signal with a microcontroller, monitor the output pulse width for the range listed

in table 2. The output signal should be observed to be a 1 Hz signal, with a period of 1000 ±25 ms. (See figure 4.)

Table 2 Signal Value 0 Range

Item

Output pulse width

(800 ms input)

min typ max unit

750 800 970 ms

TCO rise (reference)

1000 ±25 ms

750 to 970 ms

A12778

Figure 4 Time Code Value 0 Signal Output

• Create a simulated time standard radio signal (fc = 40 kHz, AM modulation (90%), fm = 1 Hz time code (this signal

you will have to create yourself)) and verify that the time is modified correctly. The sensitivity is then the minimum

level for which the time is modified correctly.

When monitoring the LA1650 output signal with a microcontroller, monitor the output pulse width for the ranges listed

in table 3. The output signal should be observed to be a 1 Hz signal, with a period of 1000 ±25 ms. (See figure 4.)

Table 3 Time Code Signal Output Ranges

Item

Output pulse width

(500 ms input)

Output pulse width

(800 ms input)

Output pulse width

(200 ms input)

min typ max unit

480 500 650 ms

750 800 970 ms

180 200 400 ms

No. 6310-13/14

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