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GP214D
1.4GHz DUAL PLL
Version 1.2 (Jan. 2006)
5
GAINTECH INCORPORATED
OPTIONAL CONTROL
The control register enables various functions shown in the table below.
LSB
Channel 1
Channel 2
MSB
Bit1
Bit2
Bit3
Bit4
Bit5
Bit6
Bit7
Bit8
Bit9
Bit10
Bit11
Bit12
Bit13
Bit14
T
CP
CP1
CP2
SB1
CP1
CP2
SB2
SBR
LD1
LD2
SW
GC2
GC1
Test
Mode
Charge
Pump
Polarity
Charge Pump
Output Current
Ch 1
Standby
Charge Pump
Output Current
Ch2
Standby
Ref.
Divider
Standby
Lock
Detector
Filter
Switch
Group Code
“0”, “0”
▪ Test mode selection (T)
H: test mode, L: normal mode
▪ Output polarity of charge pump (CP)
CP is set to “0” at normal and changed to “1” when reverse operation, according to the dependence of
VCO output frequency upon VCO input voltage. “Normal” denotes proportional response in the frequency
to the VCO input voltage.
▪ Charge pump output current (CP1 and CP2)
Charge pump employs circuits characterized by constant output current. The output current can be
selected for the best performance.
Control Bits
CP1
CP2
Charge Pump
Output Current
0
0
±1600µA
0
1
±200µA
1
0
±400µA
1
1
±800µA
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