LTC6945 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC6945' PDF : 28 Pages View PDF
OPERATION
Table 8. Serial Port Register Contents
ADDR
MSB
[6]
[5]
h00
*
*
UNLOCK
h01
*
*
x[5]
h02
PDALL
PDPLL
*
h03
*
*
*
h04
RD[7]
RD[6]
RD[5]
h05
ND[15] ND[14] ND[13]
h06
ND[7]
ND[6]
ND[5]
h07
*
*
*
h08
BST
FILT[1]
FILT[0]
h09
LKWIN[1] LKWIN[0] LKCT[1]
h0A
CPCHI
CPCLO
CPMID
h0B
REV[2]
REV[1]
REV[0]
*unused
[4]
*
*
PDOUT
*
RD[4]
ND[12]
ND[4]
*
RFO[1]
LKCT[0]
CPINV
PART[4]
[3]
*
*
PDREFO
*
RD[3]
ND[11]
ND[3]
*
RFO[0]
CP[3]
CPWIDE
PART[3]
[2]
LOCK
x[2]
*
*
RD[2]
ND[10]
ND[2]
*
OD[2]
CP[2]
CPRST
PART[2]
[1]
THI
x[1]
OMUTE
RD[9]
RD[1]
ND[9]
ND[1]
*
OD[1]
CP[1]
CPUP
PART[1]
LSB
TLO
x[0]
POR
RD[8]
RD[0]
ND[8]
ND[0]
LKEN
OD[0]
CP[0]
CPDN
PART[0]
LTC6945
R/W
DEFAULT
R
R/W
h04
R/W
h0E
R/W
h00
R/W
h01
R/W
h00
R/W
hFA
R/W
h01
R/W
hF9
R/W
h9B
R/W
hE4
R
h40
Table 9. Serial Port Register Bit Field Summary
BITS DESCRIPTION
BST REF Buffer Boost Current
CP[3:0] CP Output Current
CPCHI CP Enable Hi Voltage Output Clamp
CPCLO CP Enable Low Voltage Output Clamp
CPDN CP Pump Down Only
CPINV CP Invert Phase
CPMID CP Bias to Mid-Rail
CPRST CP Three-State
CPUP CP Pump Up Only
CPWIDE CP Extend Pulse Width
FILT[1:0] REF Input Buffer Filter
LKCT[1:0] PLL Lock Cycle Count
LKEN PLL Lock Indicator Enable
LKWIN[1:0] PLL Lock Indicator Window
LOCK PLL Lock Indicator Flag
ND[15:0] N Divider Value (ND[15:0] > 31)
DEFAULT
1
hB
1
1
0
0
1
1
0
0
h3
h1
1
h2
h00FA
BITS
OD[2:0]
OMUTE
PART[4:0]
PDALL
PDOUT
PDPLL
PDREFO
POR
RD[9:0]
REV[2:0]
RFO[1:0]
THI
TLO
UNLOCK
x[5,2:0]
DESCRIPTION
Output Divider Value (0 < OD[2:0] < 7)
Mutes RF Output
Part Code
Full Chip Power-Down
Powers Down O_DIV, RF Output Buffer
Powers Down REF, REFO, R_DIV, PFD,
CPUMP, N_DIV
Powers Down REFO
Force Power-On Reset Register Initialization
R Divider Value (RD[9:0] > 0)
Rev Code
RF Output Power
CP Clamp High Flag
CP Clamp Low Flag
PLL Unlock Flag
STAT Output OR Mask
DEFAULT
h1
1
h00
0
0
0
1
0
h001
h2
h3
h04
6945f
17
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