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参数资料
| 型号： | TDA6405ATS/C1 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 调谐器 |
| 英文描述： | VIDEO TUNER, PDSO28 |
| 封装： | PLASTIC, SOT-341, SSOP-28 |
| 文件页数： | 35/35页 |
| 文件大小： | 262K |
| 代理商： | TDA6405ATS/C1 |
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1999 Jan 13
9
Philips Semiconductors
Product specication
5 V mixer/oscillator-PLL synthesizers for
hyperband tuners
TDA6404; TDA6405;
TDA6405A
Table 7
Read data format
Note
1. MSB is transmitted first.
Table 8
Description of symbols used in Table 7
Table 9
Analog-to-digital converter levels; note 1
Note
1. Accuracy is
±0.03VCC.
NAME
BYTE
BITS
ACK
MSB(1)
LSB
Address byte
ADB
1
1000
MA1
MA0
R/W=1
A
Status byte
SB
POR
FL
ACPS
1
A2
A1
A0
SYMBOL
DESCRIPTION
A
acknowledge
POR
Power-on reset ag (POR = 1 at power-on)
FL
in-lock ag (FL = 1 when the loop is locked)
ACPS
automatic charge pump switch ag:
ACPS = 0; active
ACPS = 1; not active
A2, A1 and A0
digital outputs of the 5-level ADC (see Table 9)
A2
A1
A0
VOLTAGE APPLIED ON ADC INPUT
1
0
0.60VCC to 1.00VCC
0
1
0.45VCC to 0.60VCC
0
1
0
0.30VCC to 0.45VCC
0
1
0.15VCC to 0.30VCC
0
0 to 0.15VCC
Power-on reset
The power-on detection threshold voltage VPOR is set to
VCC = 2 V at room temperature. Below this threshold, the
device is reset to the power-on state.
At power-on state, the charge pump current is set to
280
A, the tuning voltage output is disabled, the test
bits T2, T1 and T0 are set to logic 001 (automatic charge
pump switch ‘ON’) and RSB is set to logic 1.
PUHF is ‘OFF’, which means that the UHF oscillator and
the UHF mixer are switched off. Consequently, the VHF
oscillator and the VHF mixer are switched on. PVHFL and
PVHFH are ‘OFF’, which means that the VHF tank circuit
is working in the VHF I sub-band. The tuning amplifier is
switched off until the first transmission. In that case, the
tank circuit in VHF I is supplied with the maximum tuning
voltage. The oscillator is therefore working at the end of
the VHF I sub-band.
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