AD8141(Rev0) 데이터 시트보기 (PDF) - Analog Devices

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AD8141
(Rev.:Rev0)

Low Cost, Triple Differential Drivers for Wideband Video

Analog Devices 

AD8141/AD8142

AD8142 SIGNAL LEVELS ON VARIOUS SUPPLIES

Figure 44 and Figure 45 illustrate the key video signal levels

seen in typical applications operating on a single +5 V supply

and ±2.5 V supplies; common-mode sync pulses are omitted

from the circuit drawing for clarity but are shown in a separate

waveform drawing of the signals directly at the AD8142 outputs,

shown just below the associated circuit drawing. The sync pulses

are common-mode, that is, they move in the same direction on

each output polarity. In Figure 44 and Figure 45, this means that the

HSYNC pulses are either both green or both blue for the red and

black video signals.

DISABLE FEATURE

When asserted, the disable feature minimizes quiescent current

consumption and provides a high-Z output. It offers a convenient

means to connect two driver outputs together in parallel to form a

tristate multiplexed application. The disable feature can also be

used to minimize quiescent current drawn when a particular

device is not being used.

The disable pin is a binary input that controls the state of the

AD8141/AD8142 outputs. Its binary input levels are compatible

with most TTL and CMOS families (see Table 1 for the logic levels).

The AD8141/AD8142output is disabled when the disable input

is driven to its high state, and the AD8141/AD8142operates in

its normal fashion when the disable input is driven to its low state.

An unavoidable common-mode glitch occurs at the outputs

when switching between disabled and enabled states and vice

versa. The glitch lasts for a few tens of nanoseconds and is

on the order of 2 V or 3 V. If the disable feature is used, it is

recommended that common-mode protection be used on the

receiver (see the AD8143 data sheet for a detailed description of

common-mode protection)

AD8142 KEY SIGNAL LEVELS ON SINGLE +5V SUPPLY

+5V

0.7V

0V

1.5V

AD8142

0.8V

2kΩ

75Ω

VIDEO

SOURCE

80.6Ω

38.3Ω

1kΩ

+

1kΩ

–

2kΩ

49.9Ω

100Ω

49.9Ω UTP

100Ω

0.7V

1.5V

2.2V

1.5V

0.76V

0.52V

AD8142 OUTPUT SIGNAL LEVELS INCLUDING COMMON-MODE HSYNC PULSES

2.2V

0.5V

1.5V

1.4V

0.8V

Figure 44. AD8142 Key Signal Levels on Single 5 V Supply; Upper Drawing Shows Schematic, and Lower Drawing Shows Output Signals with HSYNC Pulses

Rev. 0 | Page 20 of 24

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