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TDA6403A Fiches technique(PDF) 11 Page - NXP Semiconductors

No de pièce TDA6403A
Description  5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band tuners
Download  40 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA6403A Fiches technique(HTML) 11 Page - NXP Semiconductors

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2000 Jan 24
11
Philips Semiconductors
Product specification
5 V mixers/oscillators and synthesizers for
cable TV and VCR 2-band tuners
TDA6402; TDA6402A;
TDA6403; TDA6403A
Table 11 A to D converter levels (note 1)
Note
1. Accuracy is
±0.03 × V
CC.
POWER-ON RESET
Table 12 Default bits at power-on reset
A2
A1
A0
VOLTAGE APPLIED ON ADC INPUT
1
0
0
0.60
× VCC to 1.00 × VCC
0
1
1
0.45
× VCC to 0.60 × VCC
0
1
0
0.30
× VCC to 0.45 × VCC
0
0
1
0.15
× VCC to 0.30 × VCC
0
0
0
0 to 0.15
× VCC
NAME
BYTE
BITS
MSB
LSB
Address byte
ADB
1
1
0
0
0
MA1
MA0
X
Divider byte 1
DB1
0
XXXXXXX
Divider byte 2
DB2
XXXXXXXX
Control byte
CB
1
1
0
0
1
X
1
1
Band switch byte
BB
XXXX
0000
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
µA, the tuning voltage output is disabled, the test bits
T2, T1 and T0 are set to ‘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.
3-wire bus mode (SW = OPEN or VCC)
During a HIGH-level on the CE input (enable line), the data
is clocked into the data register at the HIGH-to-LOW
transition of the clock. The first four bits control the PNP
ports and are loaded into the internal band switch register
on the 5th rising edge of the clock pulse. The frequency
bits are loaded into the frequency register at the
HIGH-to-LOW transition of the chip enable line when an
18-bit or 19-bit data word is transmitted (see Figs 4 and 5).
When a 27-bit data word is transmitted, the frequency bits
are loaded into the frequency register on the 20th rising
edge of the clock pulse and the control bits at the
HIGH-to-LOW transition of the chip enable line (see Fig.6).
In this mode, the reference divider is given by the RSA and
RSB bits (see Table 8). The test bits T2, T1 and T0, the
charge pump bit CP, the ratio select bit RSB and the OS
bit can only be selected or changed with a 27-bit
transmission. They remain programmed if an 18-bit or
19-bit transmission occurs. Only RSA is controlled by the
transmission length when the 18-bit or 19-bit format is
used. When an 18-bit data word is transmitted, the most
significant bit of the divider N14 is internally set to logic 0
and the RSA bit is set to logic 1. When a 19-bit data word
is transmitted, the RSA bit is set to logic 0.
A data word of less than 18 bits will not affect the
frequency register of the device. The definition of the bits
is unchanged compared to I2C-bus mode.
It is not allowed to address the devices with words whose
length is different from 18, 19 or 27 bits.


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