sm5128a1s Nippon Precision Circuits Inc, (NPC), sm5128a1s Datasheet - Page 9

• Manufacturer Part Number: sm5128a1s
• Description: Cb Transceiver System Lsi
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

LD
LD is the unlock detector pin. The PLL is locked
when LD is HIGH, and the PLL is unlocked when
LD is LOW.
Inputs are LOW (case 1)
External disturbance (case 2)
When the internal phase difference t
µs, the PLL unlocks and LD goes LOW. Subse-
quently, when the difference is less than 1.6 µs for a
period of 4.8 ms, the hPLL locks and LD goes
HIGH.
PLL DATA
Phase
difference
(internal)
Phase
difference
(internal)
UP,DN
LD
LD
DISCONTINUED
PW
exceeds 1.6
PRODUCT
SM5128A1
LD goes LOW when UP, DN, TR and EMG are
LOW (case 1), and when the PLL becomes unlocked
due to an external disturbance (case 2).
NIPPON PRECISION CIRCUITS—9
t
t
PW
t
PW
t
LD
LD