TDA6650TT; TDA6651TT
NXP Semiconductors
5 V mixer/oscillator and low noise PLL synthesizer
Table 10. Reference divider ratio select bits
R2
R1
R0
Referencedivider Frequency
Frequency step
ratio
comparison
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
2
1
1
4
1
-
2 MHz
4 MHz
4 MHz
1 MHz
4 MHz
-
62.5 kHz
142.86 kHz
166.67 kHz
50 kHz
125 kHz
reserved
reserved
reserved
-
-
-
-
8.1.4 AGC detector setting
The AGC take-over point can be selected out of 6 levels according to Table 11.
Table 11. AGC programming
AL2
0
AL1
0
AL0
0
Typical take-over point level
124 dBµV (p-p)
121 dBµV (p-p)
118 dBµV (p-p)
115 dBµV (p-p)
112 dBµV (p-p)
109 dBµV (p-p)
IAGC = 0 A
[1]
[1]
[1]
[2]
[2]
[2]
[3]
[4]
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
VAGC = 3.5 V
[1] This take-over point is available for both symmetrical and asymmetrical modes.
[2] This take-over point is available for asymmetrical mode only.
[3] The AGC current sources are disabled. The AGC output goes into a high-impedance state and an external
AGC source can be connected in parallel and will not be influenced.
[4] The AGC detector is disabled and IAGC = 9 µA.
8.1.5 Charge pump current setting
The charge pump current can be chosen from 8 values depending on the value of bits
CP2, CP1 and CP0 bits; see Table 12. The programming of the CP bits are not taken into
account when ALBC mode is in use.
Table 12. Charge pump current
CP2
CP1
CP0
Charge pump current
number
Typical current (absolute
value in µA)
0
0
0
0
1
0
0
1
1
0
0
1
0
1
0
1
2
3
4
5
38
54
83
122
163
TDA6650TT_6651TT_5
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 05 — 10 January 2007
11 of 54
NXP [ NXP ]
