MAX469C Просмотр технического описания (PDF) - Maxim Integrated
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MAX469C Datasheet PDF : 16 Pages
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Two-Channel, Triple/Quad
RGB Video Switches and Buffers
Table 1a. Amplifier and Channel Selection
with LE = V+
C—S– E—N– A0
FUNCTION
0
0
0
Enables amplifier outputs.
Selects channel A.
0
0
1
Enables amplifier outputs.
Selects channel B.
0
1
X Disables amplifiers. Outputs high-Z.
1
X
X
Latches all input registers.
Changes nothing.
tWrahnesnpaLrEenitsacnodninnedcetpeedndtoengt roofuCn—Sd–,atchteivitE—yN.–
register is
This allows
adLlEol wMtonA,gXrre4og6ua3nr–ddMlaeAnsXds4oc6fo6tnhdneeevcC—itcS–aeilsnl pE—toNu–tbisnetpausteitms. utSoltgiamenptehloyeurcs(olFynignsuehrcuett
5a). For the MAX464 and MAX466, LE must be hard-
wired to either V+ or ground (rather than driving LE with
a gate) to prevent crosstalk from the digital inputs to
IN0A.
Table 1b. Amplifier and Channel Selection
with LE = GND
C—S– E—N– A0
FUNCTION
0
0
0
Enables amplifier outputs.
Selects channel A.
0
0
1
Enables amplifier outputs.
Selects channel B.
0
1
0
Disables amplifiers. Outputs high-Z.
A0 register = channel A
0
1
1
Disables amplifiers. Outputs high-Z.
A0 register = channel B
Enables amplifier outputs, latches A0
1
0
X
register, programs outputs to output A
oC—rS–B's,
according
last edge.
to
the
setting
of
A0
at
1
1
X Disables amplifiers. Outputs high-Z.
Another option for output disable is to connect LE to V+,
pE—aN–ratolleilntdheivioduutaplulytsdoisf asbelveeraalll
MAX463-MAX466s, and
devices but the one in
use
use
(Figure 5b).
When the outputs are disabled, the off isolation from
the analog inputs to the amplifier outputs is typically
70dB at 10MHz, all inputs driven with a 4VP-P sine
wave and a 150Ω load impedance. Figure 6 shows the
test circuits used to measure isolation and crosstalk.
SHUTDOWN
MAX463–
LE MAX466
EN
EN
AO MAX463–
CS MAX466
+5V
LE
MAX463–
LE MAX466
EN
EN
AO MAX463–
CS MAX466
+5V
LE
NOTE: ISOLATION RESISTORS,
(a)
(b)
IF REQUIRED, NOT SHOWN.
Figure 5. (a) Simultaneous Shutdown of all MAX463–MAX466, (b) Enable (E–—N–) Register Latched by C–—S–
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