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MPC100 Datasheet(PDF) 9 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
Part # MPC100
Description  Wide Bandwidth 4 x 1 VIDEO MULTIPLEXER
Download  15 Pages
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Manufacturer  BURR-BROWN [Burr-Brown (TI)]
Direct Link  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

MPC100 Datasheet(HTML) 9 Page - Burr-Brown (TI)

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MPC100
APPLICATIONS INFORMATION
The MPC100 operates from
±5V power supplies (±6V
maximum). Do not attempt to operate with larger power
supply voltages or permanent damage may occur. The buffer
outputs are not current-limited or protected. If the output is
shorted to ground, currents up to 18mA could flow. Momen-
tary shorts to ground (a few seconds) should be avoided, but
are unlikely to cause permanent damage.
INPUT PROTECTION
All pins on the MPC100 are internally protected from ESD
by means of a pair of back-to-back reverse-biased diodes to
either power supply as shown in Figure 1. These diodes will
begin to conduct when the input voltage exceeds either
power supply by about 0.7V. This situation can occur with
loss of the amplifier’s power supplies while a signal source
is still present. The diodes can typically withstand a continu-
ous current of 30mA without destruction. To insure long
term reliability, however, diode current should be externally
limited to 10mA or less whenever possible.
The internal protection diodes are designed to withstand
2.5kV (using Human Body Model) and will provide ad-
equate ESD protection for most normal handling proce-
dures. However, static damage can cause subtle changes in
amplifier input characteristics without necessarily destroy-
ing the device. In precision buffer amplifiers, this may cause
a noticeable degradation of offset voltage and drift. There-
fore, static protection is strongly recommended when han-
dling the MPC100.
Static damage has been well recognized for MOSFET de-
vices, but any semiconductor device deserves protection
from this potentially damaging source. The MPC100 incor-
porates on-chip ESD protection diodes as shown in Figure 1.
This eliminates the need for the user to add external protec-
tion diodes, performance.
DISCUSSION
OF PERFORMANCE
The MPC100 video multiplexer allows the user to connect
any one of four analog input channels (IN1-IN4) to the output
of the component and to switch between channels within
less than 0.5
µs. It consists of four identical unity-gain buffer
amplifiers, which are connected together internally at the
output. The open loop buffers consisting of complementary
–V
CC
+V
CC
ESD Protection diodes
internally connected to all pins.
Internal Circuitry
External Pin
FIGURE 1. Internal ESD Protection.
emitter followers applies no feedback, so their low fre-
quency gain is slightly less than unity and somewhat depen-
dent on loading. Unlike devices using MOS bilateral switch-
ing elements, the bipolar complementary buffers form an
unidirectional transmission path and thus provide high out-
put-to-input isolation. Switching stages compatible to TTL
level digital signals are provided for each buffer to select the
input channel. When no channel is selected, the output of the
device is high-impedance and allows the user to wire more
MPC100s together to form switch multi-channel matrices.
If one channel is selected with a digital “1” at the corre-
sponding SEL-input, the MPC100 acts as a buffer amplifier
with high input impedance and low output impedance. The
truth table on the front page describes the relationship
between the digital inputs (SEL1 to SEL4) and the analog
inputs (IN1 to IN4), and which signal is selected at the
output.
The 2-4 address decoder and chip select logic is not
integrated. The selected design increases the flexibility of
address decoding in complex distribution fields, eases
BUS-controlled channel selection, simplifies channel se-
lection monitoring for the user, and lowers transient peaks.
All of these characteristics make the multiplexer, in effect,
a quad switchable high-speed buffer. It requires DC cou-
pling and termination resistors when directly driven from
a low impedance cable. High-current output amplifiers are
recommended when driving low-impedance transmission
lines or inputs.
An advanced complementary bipolar process, consisting of
pn-junction isolated high-frequency NPN and PNP transis-
tors, provides wide bandwidth while maintaining low
crosstalk and harmonic distortion. The single chip band-
width of over 250MHz at an output voltage of 1.4Vp-p
allows the design of large crosspoint or distribution fields
in HDTV-quality with an overall system bandwidth of
36MHz. The buffer amplifiers also offer low differential
gain (0.05%) and phase (0.01
°) errors. These parameters
are essential for video applications and demonstrate how
well the signal path maintains a constant small-signal gain
and phase for the low-level color subcarrier at 4.43MHz
(PAL) or 3.58MHz (NSTC) as the brightness (luminance)
signal is ramped through its specified range. The bipolar
construction also ensures that the input impedance remains
high and constant between ON and OFF states. The ON/
OFF input capacitance ratio is near unity, and does not vary
with power supply voltage variations. The low output
capacitance of 1.5pF when no channel is selected is a very
important parameter for large distribution fields. Each par-
allel output capacitance is an additional load and reduces
the overall system bandwidth.
Bipolar video crosspoint switches are virtually glitch-free
when compared to signal switches using CMOS or DMOS
devices. The MPC100 operates with a fast make-before-
break switching action to keep the output switching tran-
sients small and short. Switching from one channel to
another causes the signal to mix at the output for a short
time, but it interferes only minimally with the input signals.


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