Rainbow-electronics MAX7470 Manual do Utilizador descarregar pdf (Página 4)

MAX7469/MAX7470

HDTV Continuously Variable

Anti-Aliasing Filters

4 ________________________________________________________________________________________

TIMING CHARACTERISTICS

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Serial-Clock Frequency f

SCL

0 400 kHz

Bus Free Time Between STOP (P)

and START (S) Condition

BUF

1.3 µs

Hold Time (Repeated) START (Sr)

Condition

;

STA

After this period, the first clock pulse is

generated

0.6 µs

SCL Pulse-Width Low t

LOW

1.3 µs

SCL Pulse-Width High t

HIGH

0.6 µs

Setup Time for a Repeated

START (Sr) Condition

SU;STA

0.6 µs

Data Hold Time t

;

DAT

(Note 5) 0.0 0.9 µs

Data Setup Time t

;

DAT

100 ns

Rise Time of Both SDA and SCL

Signals, Receiving

0 300 ns

Fall Time of Both SDA and SCL

Signals, Receiving

0 300 ns

Fall Time of SDA Signal,

Transmitting

(Note 6)

20 +

0.1C

250 ns

Setup Time for STOP (P)

Condition

;

STO

0.6 µs

Capacitive Load for Each Bus

Line

400 pF

Pulse Width of Spikes that Are

Suppressed by the Input Filter

(Note 7) 0 50 ns

(AV

= +5V ±5%, DV

= 2.7V to 3.6V, R

LOAD

= 150Ω to GND, C

= 0.1µF, T

= 0°C to +85°C, unless otherwise noted. Typical

values are at AV

= 5V, DV

= 3.3V, T

= +25°C.)

Note 1: The filter passband edge is set to code 255.

Note 2: The filter passband edge is set to code 40.

Note 3: 1H is the total line period, depending on the video standard. For NTSC, this is 63.5µs; for HDTV, the line period is 29.64µs.

Note 4: The clamp level is at the sync tip for signals with sync pulses, and at the blanking level otherwise.

Note 5: A master device must provide a hold time of at least 300ns for the SDA signal (referred to V

of the SCL signal) to bridge

the undefined region of SCL’s falling edge.

Note 6: C

= total capacitance of one bus line in pF. t

and t

measured between 0.3V

and 0.7V

Note 7: Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.

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