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參數(shù)資料
| 型號： | 935261234518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
| 封裝： | PLASTIC, SOT-341, SSOP-28 |
| 文件頁數(shù)： | 21/44頁 |
| 文件大小： | 241K |
| 代理商： | 935261234518 |
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2000 Jan 24
28
Philips Semiconductors
Product specication
5 V mixers/oscillators and synthesizers for
cable TV and VCR 2-band tuners
TDA6402; TDA6402A;
TDA6403; TDA6403A
Table 18 Crystal
Table 19 Transistors
Tuning amplier
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.
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 oscillator to the
supply voltage is preferred, but it can also be connected to
ground.
Examples of I2C-bus sequences (SW = VCC) for
TDA6402 and TDA6403
Tables 20 to 24 show the various sequences where:
fOSC = 100 MHz
PVHFL = ‘ON’ to switch on VHF I
FMST is ‘ON’ to switch on an FM sound trap
ICP = 280 A
N = 512
fXTAL = 4 MHz
S = START
A = acknowledge
P = STOP.
For the complete sequence see Table 20 (sequence 1) or
Table 21 (sequence 2).
COMPONENT
VALUE
X1
4 MHz
COMPONENT
VALUE
TR1
BC847B
TR2
BC847B
Table 20 Complete sequence 1
Table 21 Complete sequence 2
START
ADDRESS BYTE DIVIDER BYTE 1 DIVIDER BYTE 2 CONTROL BYTE
BAND SWITCH
BYTE
STOP
S
C2
A
06
A40A
CE
A09A
P
START
ADDRESS BYTE CONTROL BYTE
BAND SWITCH
BYTE
DIVIDER BYTE 1 DIVIDER BYTE 2
STOP
S
C2
A
CE
A09A06A40A
P
Table 22 Divider bytes only sequence
Table 23 Control and band switch bytes only sequence
Table 24 Control byte only sequence
Table 25 Status byte acquisition
Notes
1. XX = Read status byte.
2. X = No acknowledge from the master means end of
sequence.
S
C2
A
06A40A
P
SC2A
CE
A
09
A
P
SC2A
CE
A
P
SC3A
XX(1)
X(2)
P
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