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參數(shù)資料
| 型號： | TDA6501TT |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 調諧器 |
| 英文描述： | 5 V mixer/oscillator and synthesizer for PAL and NTSC standards |
| 中文描述： | 3-BAND, VIDEO TUNER, PDSO32 |
| 封裝： | 6.10 MM, 0.65 MM PITCH, PLASTIC, MO-153, SOT487-1, TSSOP-32 |
| 文件頁數(shù)： | 23/37頁 |
| 文件大?。?/td> | 223K |
| 代理商： | TDA6501TT |
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9397 750 15057
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 02 — 14 June 2005
23 of 37
Philips Semiconductors
TDA6500; TDA6501
5 V mixer/oscillator and synthesizer for PAL and NTSC standards
12. Application information
12.1 Tuning amplifier
The tuning amplifier is capable of driving the varicap voltage without an external transistor.
The tuning voltage output must be connected to an external load of 27 k
which is
connected to the tuning voltage supply rail. The loop filter design depends on the oscillator
characteristics and the selected reference frequency.
12.2 Crystal oscillator
The crystal oscillator uses a 4 MHz crystal connected in series with an 18 pF capacitor
thereby operating in the series resonance mode. Connecting the crystal to the ground is
preferred, but it can also be connected to the supply voltage.
12.3 Examples of I
2
C-bus control
Conditions:
f
osc
= 100 MHz
P0 = on (to switch on low band)
P3 = on
I
CP
= 280
μ
A
f
step
= 62.5 kHz
N = 1600
f
XTAL
= 4 MHz
I
AGC
= 245 nA
AGC take-over point = set to 112 dB
μ
V asymmetrical
12.3.1
Write sequence
Table 24
to
29
show various write sequences where:
S = START
A = acknowledge
P = STOP
For the complete sequence see
Table 24
(sequence 1) or
Table 25
(sequence 2).
Other I
2
C-bus addresses may be selected by applying an appropriate voltage to pin AS.
Table 24:
Start
Complete sequence 1
Address
byte
C2
A
Divider
byte 1
06
Divider
byte 2
40
Control
byte
CE
Band switch
byte
09
Control
byte
DE
Auxiliary
byte
20
Stop
S
A
A
A
A
A
A
P
Table 25:
Start
Complete sequence 2
Address
byte
C2
A
Control
byte
DE
Auxiliary
byte
20
Control
byte
CE
Band switch
byte
09
Divider
byte 1
06
Divider
byte 2
40
Stop
S
A
A
A
A
A
A
P
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