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PDF ZXFV302 Data sheet ( Hoja de datos )
| Número de pieza | ZXFV302 | |
| Descripción | 4:1 HIGH SPEED MULTIPLEXER | |
| Fabricantes | Zetex Semiconductors | |
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4:1 HIGH SPEED MULTIPLEXER
ZXFV302
DEVICE DESCRIPTION
FEATURES AND BENEFITS
The ZXFV302 is a 4:1 high speed analog switch
designed for use as a buffered video multiplexer and
other high-speed applications.
It features low different gain and phase distortion. The
high speed high output current capability provides 75⍀
cable drive for use in high performance video
applications.
The input channel is selected by means of two logic
lines using an internal decoder. An output enable line
allows expansion to eight channels using two devices
ZXFV302 as shown in the example application figure 1.
An alternative device, ZXFV301 provides the same
functionality and pin-out as the ZXFV302 but with four
separate logic lines controlling the switch channels
directly.
Connection Diagram
• 3dB Bandwidth 300MHz
• Slew rate 450V/ s
• Differential gain 0.01%
• Differential phase 0.04Њ
• Output current 40mA
• Stable up to 100pF load
• Ϯ5 Volt supply
• Supply current 17mA
• 16 pin SO package
APPLICATIONS
• Video routing and switching
• CCTV switching
• Video distribution selection
• RGB multiplexing
• High frequency instrumentation Data acquisition
• Data acquisition
IN 1
0V
IN 2
0V
IN3
0V
IN 4
V-
1
2
3
4
5
6
7
8
16 V+
15 OUT
14 0V
13 EN
12 A0
11 A1
10 NC
9 NC
ZXFV302
Ordering information
Part Number
Container
ZXFV302N16TA
ZXFV302N16TC
Reel 7″
Reel 13″
Increment
500
2500
ISSUE 4 - NOVEMBER 2002
Fig.1:Typical Application for 8 channel CCTV
1
1 page  
ZXFV302
APPLICATIONS INFORMATION
Introduction
A typical circuit application is outlined in Figure 1,
above, where two devices are combined to provide
8-to-1 multiplexing. A more detailed basic application
circuit for 4 dc-coupled channels is given in Figure 3,
and an AC coupled circuit for 8 channels is shown in
Figure 4. These circuits are suitable for 75⍀
transmission line connections at both the input and the
output and are useful for distribution of wide-band
signals such as video via cables. The 75⍀ reverse
terminating resistor at the output gives the correct
matching condition to a terminated video cable. The
amplifier load is then 150⍀.
The wide bandwidth of this device necessitates some
care in the layout of the printed circuit. Partly for this
reason, an Evaluation Circuit board is available and is
described in a later paragraph. A continuous ground
plane is required under the device and its signal
connection paths, to provide the shortest possible
ground return paths for signals and power supply
filtering. A double-sided or multi-layer PCB
construction is required, with plated-through via holes
providing closely spaced low-inductance connections
from some components to the continuous ground
plane (some of these holes are not visible in the figures
for the Evaluation Circuit Board – artworks and NC drill
output can be provided if required).
For the power supply filtering, low inductance surface
mount capacitors are normally required. It has been
found that very good RF decoupling is provided on
each supply using a 1000 pF NPO size 0805 ceramic
surface mount capacitor, closest to the device pin, with
an adjacent 0.1 F X7R capacitor. Other configurations
are possible and it may be found that a single 0.01 F or
0.1 F X7R capacitor, size 0805 or smaller, on each
supply gives good results. However this should be
supported by larger decoupling capacitors elsewhere
on the printed circuit board. Values of 1 to 10 F are
recommended, particularly where the voltage
regulators are located more than a few inches from the
device. These larger capacitors are recommended to
be solid tantalum electrolytic or ceramic types.
Evaluation Circuit
An evaluation circuit is available, constructed on a
double-side printed circuit board. The circuit is suitable
for both the ZXFV301 and ZXFV302 and either device
may be fitted. Figures 5 and 6 show the circuit diagram,
and the layout of components and copper. A parts list
is provided below. This layout serves as a useful
example for many applications, showing the practical
implementation of the advice given above in the
Introduction.
BNC connector sockets allow connection to test
instruments via 50⍀ cables. The output circuit includes
a resistor matching circuit to present a load of 150⍀ to
the device and simultaneously provide 50⍀ output
impedance. The attenuation of this matching circuit is
15.45 dB. As the device has unity voltage gain, the
overall loss when loaded by 75⍀ is also 15.45 dB.
EVALUATION CIRCUIT PARTS LIST:
QTY CCT-REF
VALUE DESCRIPTION
Resistors, surface mount
4 R1,R2,R3,R4
51R 0805
4 R5,R6,R7,R8
22k 0805
1 R9
120R 0805
1 R10
62R 0805
1 R11
10R 0805
5 R12 to R16
47k 0805
Capacitors, surface mount
6 100nF 25V ceramic 0805
X7R
2 1nF 50V ceramic 0805
NPO
2 10F 16V Tant Elec size
C
Integrated Circuits
1 U1
ᎏ Zetex ZXF 301N16
or ZXFV302N16
Miscellaneous
5 ᎏ BNC Socket, PCB
straight flange,
e.g. Tyco
B35N14H999X99
1 ᎏ 3-way PCB screw
terminal block IMO
20.501/3SB
1 SW1
ᎏ DIL switch, 8 way
10 TP1 to TP10
ᎏ PCB test terminal,
red, W.Hughes
100-107
ISSUE 4 - NOVEMBER 2002
5
5 Page 
Notes
ZXFV302
ISSUE 4 - NOVEMBER 2002
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ZXFV302.PDF ] | |
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