TDA6650TT; TDA6651TT
NXP Semiconductors
5 V mixer/oscillator and low noise PLL synthesizer
Table 16. Description of read data format bits…continued
Bit
Description
ALBC
automatic loop bandwidth control flag
ALBC = 0, no automatic loop bandwidth control
ALBC = 1, automatic loop bandwidth control selected
internal AGC flag
AGC
AGC = 0 when internal AGC is active (VAGC < VRML
)
AGC = 1 when internal AGC is not active (VAGC > VRMH
)
A2, A1, A0
digital outputs of the 5-level ADC; see Table 17
Table 17. ADC levels
Voltage applied to pin ADC[1]
0.6VCC to VCC
A2
1
A1
A0
0
0
1
1
0
0
0.45VCC to 0.6VCC
0.3VCC to 0.45VCC
0.15VCC to 0.3VCC
0 V to 0.15VCC
0
1
0
0
0
1
0
0
[1] Accuracy is ±0.03VCC. Bit BS5 must be set to logic 0 to disable the BS5 output port. The BS5 output port
uses the same pin as the ADC and can not be used when the ADC is in use.
8.3 Status at power-on reset
At power on or when the supply voltage drops below approximately 2.85 V (at
Tamb = 25 °C), internal registers are set according to Table 18.
At power on, the charge pump current is set to 580 µA, the test bits T[2:0] are set to 110
which means that the charge pump is sinking current, the tuning voltage output is disabled
and the ALBC function is disabled. The XTOUT buffer is on, driving the 4 MHz signal from
the crystal oscillator and all the ports are off. As a consequence, the high band is selected
by default.
Table 18. Default setting at power-on reset
Name
Byte
Bit[1]
MSB
LSB
Address byte
1
2
3
4
1
1
0
0
0
MA1
MA0
X
Divider byte 1 (DB1)
Divider byte 2 (DB2)
Control byte 1 (CB1)
0
N14 = X
N13 = X N12 = X N11 = X N10 = X N9 = X
N8 = X
N0 = X
R0 = X
AL0 = 0
N7 = X
N6 = X
N5 = X
N4 = X
T1 = 1
0
N3 = X
T0 = 0
N2 = X
R2 = X
N1 = X
R1 = X
AL1 = 1
1
1
T/A = X[2] T2 = 1
T/A = X[3]
0
ATC = 0 AL2 = 0
Control byte 2 (CB2)
5
CP2 = 1 CP1 = 1
CP0 = 1 BS5 = 0 BS4 = 0 BS3 = 0 BS2 = 0 BS1 = 0
[1] X means that this bit is not set or reset at power-on reset.
[2] The next six bits are written, when bit T/A = 1 in a write sequence.
[3] The next six bits are written, when bit T/A = 0 in a write sequence.
TDA6650TT_6651TT_5
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 05 — 10 January 2007
14 of 54
NXP [ NXP ]
