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PDF HI-524 Data sheet ( Hoja de datos )
| Número de pieza | HI-524 | |
| Descripción | 4-Channel Wideband and Video Multiplexer | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Data Sheet
HI-524
July 1999 File Number 3148.2
4-Channel Wideband and Video
Multiplexer
The HI-524 is a 4-Channel CMOS analog multiplexer designed
to process single-ended signals with bandwidths up to 10MHz.
The chip includes a 1 of 4 decoder for channel selection and an
enable input to inhibit all channels (chip select).
Three CMOS transmission gates are used in each channel,
as compared to the single gate in more conventional CMOS
multiplexers. This provides a double barrier to the unwanted
coupling of signals from each input to the output. In addition,
Dielectric Isolation (DI) processing helps to insure the
Crosstalk is less than -60dB at 10MHz.
The HI-524 is designed to operate into a wideband buffer
amplifier such as the Intersil HA-2541. The multiplexer chip
includes two “ON” switches in series, for use as a feedback
element with the amplifier. This feedback resistance
matches and tracks the channel ON resistance, to minimize
the amplifier VOS and its variation with temperature.
The HI-524 is well suited to the rapid switching of video and
other wideband signals in telemetry, instrumentation, radar
and video systems.
Ordering Information
PART
NUMBER
HI1-0524-5
HI3-0524-5
TEMP. RANGE
(oC)
PACKAGE
PKG. NO.
0 to 75
18 Ld CERDIP F18.3
0 to 75
18 Ld PDIP
E18.3
Pinout
HI-524 (CERDIP, PDIP)
TOP VIEW
+V 1
OUT 2
SIG GND 3
SIG GND 4
IN4 5
SIG GND 6
IN3 7
SUPPLY GND 8
A1 9
18 FB (IN)
17 -V
16 FB (OUT)
15 SIG GND
14 IN2
13 SIG GND
12 IN1
11 EN
10 A0
Features
• Crosstalk (10MHz) . . . . . . . . . . . . . . . . . . . . . . . . < -60dB
• Fast Access Time . . . . . . . . . . . . . . . . . . . . . . . . . 150ns
• Fast Settling Time . . . . . . . . . . . . . . . . . . . . . . . . . 200ns
• TTL Compatible
Applications
• Wideband Switching
• Radar
• TV Video
• ECM
Functional Diagram
IN1 FB (IN)
SIG GND
IN2
SIG GND
IN3
FB (OUT)
OUTPUT
SIG GND
IN4
SIG GND
SIG GND
1 OF 4
DECODER
1
-15V SUP +15V EN A0 A1
GND
TRUTH TABLE
A1 A0 EN ON CHANNEL
X X L None
L L H 1 (Note)
L HH
2
HLH
3
HHH
4
NOTE: Channel 1 is shown selected in the Functional Diagram.
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 1999
1 page  
HI-524
Test Circuits and Waveforms TA = 25oC, VSUPPLY = ±15V, VAH = 2.4V, VAL = 0.8V, Unless Otherwise Specified (Continued)
VA INPUT
5V/DIV.
S1 ON
OUTPUT
S4 ON
1V/DIV.
50ns/DIV.
FIGURE 4. ACCESS TIME WAVEFORMS
Application Information
Often it is desirable to buffer the Hl-524 output, to avoid
loading errors due to the channel “ON” resistance:
HA-524
CH1
12
75Ω
CH2
14
75Ω
CH3
75Ω
7
HA-2541
2
18
+
-
BUFFERED
OUTPUT
20pF (NOTE)
16
CH4
75Ω
5
NOTE: Capacitor value may be selected to optimize AC performance.
FIGURE 5.
The buffer amplifier should offer sufficient bandwidth and
slew rate to avoid degradation of the anticipated signals. For
video switching, the HA-5033 and HA-2542 offer good
performance plus ±100mA output current for driving coaxial
cables. For general wideband applications, the HA-2541
offers the convenience of unity gain stability plus 90ns
settling (to ±0.1%) and ±10V output swing. Also, the Hl-524
includes a feedback resistance for use with the HA-2541.
This resistance matches and tracks the channel “ON”
resistance, to minimize offset voltage due to the buffer's bias
currents.
Note that the on-chip feedback element between pins 16 and
18 includes two switches in series, to simulate a channel
resistance. These switches open for VEN = Low. This allows
two or more Hl-524s to operate into one HA-2541, with their
feedback elements connected in parallel. Thus, only the
selected multiplexer provides feedback, and the amplifier
remains stable.
All Hl-524 pins labeled ‘SlG GND’ (pins 3, 4, 6, 13, 15)
should be externally connected to signal ground for best
crosstalk performance.
Bypass capacitors (0.1µF to 1µF) are recommended from
each HI-524 supply pin to power ground (pins 1 and 17 to
pin 8). Locate the buffer amplifier near the Hl-524 so the two
capacitors may bypass both devices.
If an analog input 1V or greater is present when supplies are
off, a low resistance is seen from that input to a supply line.
(For example, the resistance is approximately 160Ω for an
input of -3V.) Current flow may be blocked by a diode in each
supply line, or limited by a resistor in series with each
channel. The best solution, of course, is to arrange that no
digital or analog inputs are present when the power supplies
are off.
5
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| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet HI-524.PDF ] | |
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