TDA6501 데이터 시트보기 (PDF) - Philips Electronics
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TDA6501 Datasheet PDF : 37 Pages
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Philips Semiconductors
TDA6500; TDA6501
5 V mixer/oscillator and synthesizer for PAL and NTSC standards
9397 750 15057
Product data sheet
pulse, the control register is loaded with data from byte CB after the 8th SCL clock pulse,
the band switch register is loaded with data of byte BB after the 8th SCL clock pulse and
the auxiliary register is loaded with data of byte AB after the 8th SCL clock pulse.
To program the AGC take-over point setting and the AGC current to a different value than
the default value, an additional byte, the auxiliary byte, has to be sent. To this end, the
auxiliary byte is preceded by a control byte with the test bits T2, T1 and T0 set to logic 011
(see Table 8).
Table 5: I2C-bus data format for write mode
Name
Byte Bit
Ack
MSB
LSB
Address byte ADB 1
1
0
0
0
MA1 MA0 R/W = 0 A
Divider byte 1 DB1 0
N14 N13 N12 N11 N10 N9 N8
A
Divider byte 2 DB2 N7 N6 N5 N4 N3 N2 N1 N0
A
Control byte
CB 1
CP T2 T1 T0 RSA RSB OS
A
Band switch byte BB 0
P6 0
P4 P3 P2 P1 P0
A
Auxiliary byte [1] AB
ATC AL2 AL1 AL0 0
0
0
0
A
[1] Auxiliary byte AB replaces band switch byte BB when bit T2 = 0, T1 = 1 and T0 = 1.
Table 6: Description of bits shown in Table 5
Symbol
Description
A
acknowledge
MA1 and MA0
programmable address bits; see Table 7
R/W
logic 0 for write mode
N14 to N0
programmable divider bits;
N = (N14 × 214) + (N13 × 213) + ... + (N1 × 21) + N0
CP
charge pump current
CP = 0: the charge pump current is 60 µA
CP = 1: the charge pump current is 280 µA (default)
T2, T1 and T0
test bits; see Table 8
RSA and RSB
reference divider ratio select bits; see Table 9
OS
tuning amplifier control bit
OS = 0: normal operation; tuning voltage is on
OS = 1: tuning voltage is off; high-impedance state (default)
P6 and P4
NPN port control bits
Pn = 0: port n is off; high-impedance state (default)
P3 to P0
Pn = 1: buffer n is on; VO = VCE(sat)
PMOS port control bits
Pn = 0: port n is off; high-impedance state (default)
Pn = 1: buffer n is on; VO = VCC − VDS(sat)
ATC
AGC time constant
AL2, AL1 and AL0
ATC = 0: IAGC = 220 nA; ∆t = 2 s with C = 160 nF (default)
ATC = 1: IAGC = 9 µA; ∆t = 50 ms with C = 160 nF
AGC take-over point bits; see Table 10
Rev. 02 — 14 June 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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