tda6403a NXP Semiconductors, tda6403a Datasheet - Page 10

• Manufacturer Part Number: tda6403a
• Description: 5 V Mixers/oscillators And Synthesizers For Cable Tv And Vcr 2-band Tuners
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 8 Reference divider ratio select bits
Note
1. X = don’t care.
R
Data can be read from the device by setting the R/W bit to
logic 1. After the slave address has been recognized, the
device generates an acknowledge pulse and the first data
byte (status byte) is transferred on the SDA line (MSB
first). Data is valid on the SDA line during a HIGH-level of
the SCL clock signal. A second data byte can be read from
the device if the microcontroller generates an
acknowledge on the SDA line (master acknowledge).
End of transmission will occur if no master acknowledge
occurs. The device will then release the data line to allow
the microcontroller to generate a STOP condition.
The POR flag is set to logic 1 at power-on. The flag is reset
when an end-of-data is detected by the device (end of a
Table 9 Read data format
Note
1. MSB is transmitted first.
Table 10 Description of symbols used in Table 9
2000 Jan 24
Address byte
Status byte
A
POR
FL
ACPS
A2, A1, A0
EAD MODE
5 V mixers/oscillators and synthesizers for
cable TV and VCR 2-band tuners
SYMBOL
NAME
RSA
X
0
1
(1)
; R/W = 1 (see Table 9)
acknowledge
power-on reset flag (POR = 1 at power-on)
in-lock flag (FL = 1 when the loop is locked)
automatic charge pump switch flag:
digital outputs of the 5-level ADC
BYTE
ADB
ACPS = 0; active
ACPS = 1; not active
SB
RSB
0
1
1
MSB
POR
1
(1)
FL
1
REFERENCE DIVIDER RATIO
ACPS
0
1024
640
512
10
DESCRIPTION
READ sequence). Control of the loop is made possible
with the in-lock flag FL which indicates when the loop is
locked (FL = 1).
The automatic charge pump switch flag (ACPS) is LOW
when the automatic charge pump switch mode is ‘ON’ and
the loop is locked. In other conditions, ACPS = 1.
When ACPS = 0, the charge pump current is forced to the
LOW value.
A built-in ADC is available on LOCK/ADC pin (I
mode only). This converter can be used to apply AFC
information to the microcontroller from the IF section of the
television. The relationship between the bits A2, A1 and A0
is given in Table 11.
0
1
BITS
0
1
MA1
A2
TDA6402; TDA6402A;
TDA6403; TDA6403A
FREQUENCY STEP (kHz)
MA0
A1
3.90625
7.8125
6.25
Product specification
R/W = 1
LSB
A0
2
C-bus
ACK
A