MAX7469/MAX7470
HDTV Continuously Variable
Anti-Aliasing Filters
14 _______________________________________________________________________________________
VIDEO-SIGNAL FORMAT F7 F6 F5 F4 F3 F2 F1 F0 CODE NO.
APPROXIMATE FREQUENCY
(-3dB) MHz
Standard Definition (Interlaced) 0 0 1 0 1 0 0 0 40 10
Standard Definition (Progressive) 0 1 0 1 1 0 1 0 90 15
High-Definition Low Bandwidth 1 1 0 1 1 1 0 0 220 30
High-Definition High Bandwidth 1 1 1 1 1 1 1 1 255 34 (default)
Table 6. Frequency Register Setting for Different Video-Signal Formats
selected in the command byte. Figure 8 shows a basic
read sequence.
Note: The master has to write a command byte,
requesting to read the control/status or frequency reg-
ister, to the slave (MAX7469/MAX7470) before the mas-
ter can read the contents of the selected register.
Control/Status Register
The MAX7469/MAX7470 store their status in an 8-bit
register that can be read back by the master. The indi-
vidual bits of the control/status register are summarized
in Tables 4 and 5. The power-on default value of this
register is 03h.
Frequency Register
The frequency response (-3dB passband edge) of the
MAX7469/MAX7470 can be continuously varied in 256
linear steps by changing the codes in the frequency reg-
ister (Table 6). See the
Command Byte
(
Write Cycle)
sec-
tion for a write sequence to update the frequency register.
SDA
SCL
10010A1A0
R/W
C7 C6 C5 C4 C3 C2 C1 C0
ACK ACK
OUTINOUTIN TO MAX7469/MAX7470
SDA (CONT)
SDA
DIRECTION
SDA
DIRECTION
SCL (CONT)
D7 D6 D5 D4 D3 D2 D1 D0ACK ACK
OUTIN IN
START
1 0 0 1 0 A1 A0 R/W
STOP
Sr
0001001/0
1
Figure 8. Basic Read Sequence
CONTROL/STATUS REGISTER
S7 S6 S5 S4 S3 S2 S1 S0
Table 4. Control/Status Register
Table 5. Control/Status Register Bit
Description
BIT DESCRIPTION
S7
0 = component input signal selected (default).
1 = composite input signal selected.
S6
0 = internal sync enabled (default).
1 = external sync enabled.
S5
0 = external sync: positive polarity (default).
1 = external sync: negative polarity.
S4
0 = normal operation mode (default).
1 = power-down mode.
S3
0 = filters enabled (default).
1 = bypass mode—no filtering.
S2
0 = clamp voltage for IN1 set to low (default).
1 = clamp voltage for IN1 set to high.
S1
0 = clamp voltage for IN2 set to low.
1 = clamp voltage for IN2 set to high (default).
S0
0 = clamp voltage for IN3 set to low.
1 = clamp voltage for IN3 set to high (default).
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