TDA6650TT; TDA6651TT
NXP Semiconductors
5 V mixer/oscillator and low noise PLL synthesizer
To fully program the device, either sequence of Table 23 or 24 can be used, while other
arrangements of the bytes are also possible.
Table 23. Complete sequence 1
Start Address
byte
Divider
byte 1
Divider
byte 2
Control
byte 1[1]
Control
byte 2
Control
byte 1[2]
Stop
S
C2
A
12
A
C0
A
CA
A
A4
A
84
A
P
[1] Control byte 1 with bit T/A = 1, to program test bits T2, T1 and T0 and reference divider ratio bits R2, R1
and R0.
[2] Control byte 1 with bit T/A = 0, to program AGC time constant bit ATC and AGC take-over point bits
AL2, AL1 and AL0.
Table 24. Complete sequence 2
Start Address
byte
Control
byte 1[1]
Control
byte 2
Divider
byte 1
Divider
byte 2
Control
byte 1[2]
Stop
S
C2
A
CA
A
A4
A
12
A
C0
A
84
A
P
[1] Control byte 1 with bit T/A = 1, to program test bits T2, T1 and T0 and reference divider ratio bits R2, R1
and R0.
[2] Control byte 1 with bit T/A = 0, to program AGC time constant bit ATC and AGC take-over point bits
AL2, AL1 and AL0.
Table 25. Sequence to program only the main divider ratio
Start
Address byte
C2
Divider byte 1
12
Divider byte 2
C0
Stop
S
A
A
A
P
Table 26. Sequence to change the charge pump current, the ports and the test mode. If the
reference divider ratio is changed, it is necessary to send the DB1 and DB2 bytes
Start
Address byte
C2
Control byte 1[1]
Control byte 2
A4
Stop
S
A
CA
A
A
P
[1] Control byte 1 with bit T/A = 1, to program test bits T2, T1 and T0 and reference divider ratio bits R2, R1
and R0.
Table 27. Sequence to change the test mode. If the reference divider ratio is changed, it is
necessary to send the DB1 and DB2 bytes
Start
Address byte
Control byte 1[1]
Stop
S
C2
A
CA
A
P
[1] Control byte 1 with bit T/A = 1, to program test bits T2, T1 and T0 and reference divider ratio bits R2, R1
and R0.
Table 28. Sequence to change the charge pump current, the ports and the AGC data
Start
Address byte
C2
Control byte 1[1]
Control byte 2
A4
Stop
S
A
82
A
A
P
[1] Control byte 1 with bit T/A = 0, to program AGC time constant bit ATC and AGC take-over point bits
AL2, AL1 and AL0.
TDA6650TT_6651TT_5
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 05 — 10 January 2007
46 of 54
NXP [ NXP ]
