LUCW3000CCN AGERE [Agere Systems], LUCW3000CCN Datasheet - Page 13

• Manufacturer Part Number: LUCW3000CCN
• Description: W3000 PLL Dual-Band Frequency Synthesizer
• Manufacturer: AGERE [Agere Systems]

Advance Data Sheet
December 1999
REF Register
Table 13. D5: Phase Detector Polarity (Bit 17)
The phase detector can be programmed for either a negative or positive slope to accommodate the VCO and
low-pass filter characteristics. (See Figure 7.)
Table 14. RE: Reset (Bit 20)
After the power supply is turned on, the REF register must be programmed with a reset. This must be followed by
a programming of the MAIN register before or at the enabling of the PLL circuit.
The RE bit will clear itself, and is required to ensure correct initialization of the IC. This results in the following
conditions:
+
+
+
D5
0
1
The RE bit is cleared back to 0.
The device is in powerdown mode, since the EN[1:2] bits are also cleared.
Previous reference and main counter values are maintained.
RE
Lucent Technologies Inc.
0
1
Phase Detector Polarity
(continued)
Reset MAIN and secondary registers
Negative slope
Positive slope
REFERENCE
Figure 7. Programming the Phase Detector Slope
Operation mode
Response
W3000
FILTER
LOOP
VCO
W3000 PLL Dual-Band Frequency Synthesizer
VCO INPUT CONTROL
VOLTAGE
1
0
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