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MPC104AU Datasheet(PDF) 9 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
Part # MPC104AU
Description  Wide-Bandwidth 2 x 1 VIDEO MULTIPLEXER
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Manufacturer  BURR-BROWN [Burr-Brown (TI)]
Direct Link  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

MPC104AU Datasheet(HTML) 9 Page - Burr-Brown (TI)

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®
MPC104
9
APPLICATIONS INFORMATION
The MPC104 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
As shown below, all pins on the MPC104 are internally
protected from ESD by a pair of back-to-back reverse-biased
diodes to either power supply. 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 continuous
current of 30mA without destruction. To insure long term
reliability, however, diode current should be externally lim-
ited to 10mA 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
the characteristics of the buffer amplifier input without
necessarily destroying the device. In precision buffer ampli-
fiers, such damage may cause a noticeable degradation of
offset voltage and drift. Therefore, static protection is strongly
recommended when handling the MPC104.
Static damage has been well-recognized as a problem for
MOSFET devices, but any semiconductor device deserves
protection from this potentially damaging source. The
MPC104 incorporates on-chip ESD protection diodes as
shown in Figure 1. Thus the user does not need to add
external protection diodes, which can add capacitance and
degrade AC performance.
DISCUSSION
OF PERFORMANCE
The MPC104 is a 2 x 1, wide-band analog signal multi-
plexer. It allows the user to connect one of the two inputs
(IN
1/IN2 ) to the output. The switching speed between two
input channels is typically less than 300ns.
However, in contrast to signal switches using CMOS or
DMOS transistors, the switching transients were kept very
FIGURE 1. Internal ESD Protection.
–V
CC
+V
CC
ESD Protection diodes
internally connected to all pins.
Internal Circuitry
External Pin
low at +13mV and –4mV. The MPC104 consists of two
identical unity-gain buffer amplifiers, respectively connected
together internally at the output. The open-loop buffer amps,
which consist of complementary emitter followers, apply no
feedback so their low-frequency gain is slightly less than
unity and somewhat dependent on loading. Unlike devices
using MOS bilateral switching elements, the bipolar comple-
mentary buffers form a unidirectional transmission path,
thus providing high output-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 outputs of the device are high-impedance and
allow the user to wire several MPC104s together to create
multichannel switch matrices.
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 selection monitoring for the user, and
lowers transient peaks. All of these characteristics make the
multiplexer, in effect, a quad switchable high-speed buffer.
The buffers require DC coupling and termination resistors
when driven directly 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 210MHz at an output voltage of 1.4Vp-p
allows the design of multi-channel crosspoint or distribution
fields in HDTV-quality with an overall system bandwidth of
36MHz, or in quality for high resolution graphic and imag-
ing systems with 200MHz system bandwidth. The buffer
amplifiers also offer low differential gain (0.03%) and phase
(0.01
°) errors. These parameters are essential for video
applications and demonstrate how well the signal path main-
tains a constant small-signal gain and phase for the low-level
color subcarrier at 4.43MHz (PAL) or 3.58MHz (NSTC) as
the luminance signal is ramped through its specified range.
The bipolar construction also ensures that the input imped-
ance 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 1.2pF when no channel is selected is
a very important parameter for large distribution fields. Each
parallel 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 MPC104 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 hardly interferes with the input signals. The
transient peaks remain less than +13mV and –4mV. The
generated output transients are extremely small, so DC
clamping during switching between channels is unneces-
sary. DC clamping during the switching dead time is re-


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