lc7152 Sanyo Semiconductor Corporation, lc7152 Datasheet - Page 12

• Manufacturer Part Number: lc7152
• Description: Universal Dual-pll Frequency Synthesizers
• Manufacturer: Sanyo Semiconductor Corporation

Dual Charge Pump Descriptions
If an unlock state is detected at channel switch, the sub-charge pump operates, R1M/R1S becomes R1, low-pass filter’s time
constant is reduced, and the lockup accelerates.
When the circuit is locked, side-band characteristics and modulation characteristics are improved by making the sub-charge pump
off, i.e., floating, R1M to be R1, and increasing low-pass filter’s time constant.
Device Comparison
LC7152
LC7152M
LC7152NM
LC7152KM
Device
1.5 to 23 MHz
FA/FB = 0
Yes
Yes
Yes
Yes
20 to 55 MHz
Operating frequency
LC7152, 7152M, 7152NM, 7152KM
Yes
Yes
Yes
Yes
FA/FB = 1
(V
DD
55 to 80 MHz
= 2.7 to 3.3 V)
Yes
No
No
No
Power-on reset
circuit
Yes
No
No
No
(Unlock detector output)
(Secondary charge pump output)
(Main charge pump output)
(Low-pass filter output)
Package
MFP24S
MFP24S
MFP24S
DIP24S
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