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參數(shù)資料
| 型號： | TB1261F |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80 |
| 文件頁數(shù)： | 7/66頁 |
| 文件大?。?/td> | 1538K |
| 代理商： | TB1261F |
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TB1261F/TB1262F
2002-6-30 15 / 66
9,
BUS Description
WRITE MODE
[[[[PIF
PIF
PIF]]]]
RF AGC
RF AGC (00)
(00)
[[[[ Sub;
Sub;
Sub; 0C
0C
0Ch
hh
h D5~D0
D5~D0
D5~D0 6666 bits ]
bits ]
Data
Descriptions
00
IF mute
Stops Demodulation
01
65dB(uV)
3F
105 dB(uV)
RF AGC delay point (Pin6-7)
PIF Fre
PIF Freq.
q.
q. (00)
(00)
[[[[ Sub;
Sub;
Sub; 0D
0D
0Dh
hh
h D7~D5
D7~D5
D7~D5 3 bits ]
3 bits ]
Data
Descriptions
000
45.75 MHz
001
39.5 MHz
010
38.9 MHz
011
38.0 MHz
100
34.2 MHz
101
33.9 MHz
Setting IF frequency according to tuner frequency. It
fixes the VCO frequency and AFT center frequency.
VCO
VCO----M
M
M (0)
(0)
[[[[ Sub;
Sub;
Sub; 0D
0D
0Dh
hh
h D1
D1
D1 1 bit ]
1 bit ]
Data
Descriptions
0
Absolute
(duration of searching)
1
Relative
(normal)
VCO tuning mode
TB1261 has two VCO tuning mode, which are
'Absolute' and 'relative'. The 'Absolute' mode refers
the crystal oscillation frequency 4.43MHz, the
'Relative' mode refers the IF input frequency, which is
tuned by AFT loop.
Set 'Relative' mode in normal receiving, and 'Absolute'
in channel searching. Even setting the 'Relative' mode,
the VCO
mode works as 'Absolute' in status of 'PIF Unlock'
automatically.
AFT
AFT----S
S
S (0)
(0)
[[[[ Sub;
Sub;
Sub; 0E
0E
0Eh
hh
h D7
D7
D7 1 bit ]
1 bit ]
Data
Descriptions
0
Wide
400kHz
1
Narrow
100kHz
The range of the AFT-W read.
Over
Over M
M
Mod
od
od (0)
(0)
[[[[ Sub;
Sub;
Sub; 0E
0E
0Eh
hh
h D5
D5
D5 1 bit]
1 bit]
Data
Descriptions
0
Off
(recommended)
1
On
on/off the over modulation switch
The measure circuit against over modulation stops the
APC in detecting the over modulation, in order to avoid
folding the detected signal. It may cause, however,
malfunction against the phase modulated RF signals.
So evaluate carefully in using this function.
PLL
PLL----S
S
S (0)
(0)
[[[[ Sub;
Sub;
Sub; 0C
0C
0Ch
hh
h D6
D6
D6 1 bit ]
1 bit ]
Data
Descriptions
0
Normal
(recommended)
1
speed-up （x2）
PLL Sensitivity. Set always '0; normal'
Buzz
Buzz----R
R
R (0)
(0)
[[[[ Sub;
Sub;
Sub; 0E
0E
0Eh
hh
h D6
D6
D6 1 bit ]
1 bit ]
Data
Descriptions
0
On (recommended)
1
Off
Nyquist Buzz Reducer SW.
PIF
PIF Det
Det
Det lev
lev
lev ((((4)
4)
[[[[ Sub;
Sub;
Sub; 1A
1A
1Ah
hh
h D5~D4
D5~D4
D5~D4 2 bits ]
2 bits ]
Data
Descriptions
0
Min
3
Max
PIF detected output level trimming
2.0
2.1
2.2
2.3
2.4
0
1
2
3
(V pp)
BUS setting
Graph PIF det out level
P
IF
det
out
le
ve
l
L
L----SECAM
SECAM
SECAM (0),
(0),
(0), L
L
L----AGC
AGC
AGC(0)
(0)
(0), FM Stop
, FM Stop
[[[[ Sub;
Sub;
Sub; 12
12
12h
hh
h D1,D0
D1,D0
D1,D0 2 bits ]
2 bits ]
D1
D0
Descriptions
0
not LSECAM, not FM stop
0
1
L-SECAM
1
L-SECAM & AGC speed up
1
0
FM Stop
{L-SECAM}
Selecting the IF mode to the L-system or not.
This mode is available only for the TB1262. This bit
set to L-system as to;
- Turn the modulation polarity to positive
- Delay the AGC time constant (Peek AGC),
with switching the IF AGC filter to the capacitor
of DCNF pin (10uF) instead of IFAGC pin
(0.47uF) .
- SIF AM demodulation (Split carrier only)
with switching the SIF AGC filter to the
capacitor of IFAGC pin (0.47uF) .
{L-SECAM AGC speed up}
Speed up the AGC response for channel search
{FM Stop}
Stopping the FM demodulator to use in NICAM
demodulation.
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