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| 型号： | TDA6500TT/C4,118 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 调谐器 |
| 英文描述： | 3-BAND, VIDEO TUNER, PDSO32 |
| 封装： | 6.10 MM, 0.65 MM PITCH, PLASTIC, MO-153, SOT487-1, TSSOP-32 |
| 文件页数： | 16/37页 |
| 文件大小： | 223K |
| 代理商： | TDA6500TT/C4,118 |
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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 amplier
The tuning amplier 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 lter 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 I2C-bus control
Conditions:
fosc = 100 MHz
P0 = on (to switch on low band)
P3=on
ICP = 280 A
fstep = 62.5 kHz
N=1600
fXTAL = 4 MHz
IAGC = 245 nA
AGC take-over point = set to 112 dB
V asymmetrical
12.3.1 Write sequence
S=START
A = acknowledge
P=STOP
Other I2C-bus addresses may be selected by applying an appropriate voltage to pin AS.
Table 24:
Complete sequence 1
Start
Address
byte
Divider
byte 1
Divider
byte 2
Control
byte
Band switch
byte
Control
byte
Auxiliary
byte
Stop
S
C2
A
06
A
40
A
CE
A
09
A
DE
A
20
A
P
Table 25:
Complete sequence 2
Start
Address
byte
Control
byte
Auxiliary
byte
Control
byte
Band switch
byte
Divider
byte 1
Divider
byte 2
Stop
S
C2
A
DE
A
20
A
CE
A
09
A
06
A
40
A
P
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