(Notes 1 through 6 are applicable to the Receiver Differential Resistance and Differential Capacitance specifications:)
(1) Specifications include both transmitter and receiver (assumed tied together externally).
(2) Impedance parameters are specified directly between pins TX/RX A(B) and TX/RX A(B) of the hybrid.
(3) It is assumed that all power and ground inputs to the hybrid are connected.
(4) The specifications are applicable for both unpowered and powered conditions.
(5) The specifications assume a 2 volt rms balanced, differential, sinusoidal input. The applicable frequency range is 75 kHz to 1 MHz.
(6) Minimum resistance and maximum capacitance parameters are guaranteed over the operating range, but are not tested.
(7) The Threshold Level, as referred to in this specification, is meant to be the maximum peak-to-peak voltage (measured on the stub) that can be applied to the
receiver's input without causing the output to change from the OFF state.
(8) Assumes a common mode voltage within the frequency range of dc to 2 MHz, applied to pins of the isolation transformer on the stub side (either direct or transformer
coupled), and referenced to transceiver ground. Transformer must be a DDC recommended transformer or other transformer that provides an equivalent minimum
CMRR.
(9) MIL-STD-1760 requires minimum output voltage of 20 Vp-p on the stub connection.
(10) Power dissipation specifications assume a transformer coupled configuration, with external dissipation (while transmitting) of 0.14 watts for the active isolation
transformer, 0.08 watts for the active coupling transformer, 0.45 watts for each of the two bus isolation resistors, and 0.15 watts for each of the two bus termination
resistors.
(11) Thermal resistance, Junction-to-Ambient (θ
JA
) (Either Channel) applies when the device is soldered to a 4 in x 4 in x 0.060 in (FR4 or equivalent) PC board with a
“1-oz” (1.4 mil thickness) ground-plane layer on the back of the board, positioned horizontally in still air.
(12) Assuming the use of isolation transformers with the turns ratios shown in Figure 3 and in the absence of common mode signal on the 1553 stub, this equates to a
nominal stub voltage of 38 Volts
PK-to-PK
transformer-coupled, or 53 Volts
PK-to-PK
direct-coupled.
Data Device Corporation
www.ddc-web.com
4
DS-BU-63152-M
3/13
GENERAL
The BU-63152 is a dual redundant transmitter and receiver pack-
aged in a 64-pin QFP (see Figure 5). It is directly compatible to
Harris 15530 encoder/decoder and has internal (factory preset)
threshold levels. Requiring only a +5V power supply, the
BU-63152 is designed for use in any MIL-STD-1553 application.
FIGURE 1 shows a BU-63152 transceiver connected to a MIL-
STD 1553 Data Bus. Once transformer isolated, coupling to a
MIL-STD-1553 Data Bus can be either short stub (direct) or long
stub (transformer). The recommended transformer for long and
short stub coupling is Beta P/N B-3226 (through hole) or B-3227
(surface mount). There are other transformer configurations
available from Beta. Reference FIGURE 3 and TABLE 2.
rations (long or short stub). This data is converted to bi-phase
TTL and made available for decoding at the RX DATA and
RX DATA terminals. Applying a logic “1” to the STROBE input
allows data to pass through to the receiver output. Applying a
logic “0” to the STROBE input turns the receiver output OFF.
The BU-63152 receiver outputs are both at a logic “0” when they
are either strobed off, or no signal is being received. This is
directly compatible with a “Harris” type of encoder/decoder.
Compatibility to a “Smiths” type of encoder/decoder may be
accomplished by swapping the RX DATA OUT and
RX DATA OUT outputs and then inverting them (see FIGURE 4).
BU-63152 WAVEFORMS
FIGURE 2 illustrates the waveforms for the BU-63152. Note that
DATA and DATA inputs must be complementary waveforms of
50% average duty cycle while transmitting.
TRANSMIT OPERATING MODE
The transmitter section accepts encoded TTL data and converts
it to phase-modulated differential format by means of a wave-
shaping network and driver circuitry. These driver outputs are
coupled to a MIL-STD-1553 Data Bus via a transformer which is
driven from the TX DATA OUT and TX DATA OUT terminals.
These output terminals can be put into a high impedance state
when transmitting by bringing the respective TX_INHIBIT input
to logic “1”, or by placing both inputs at the same logic level.
TABLE 3, Transmit Operating Mode, lists the functions for the
output data and input data in reference to the state of INHIBIT.
The transceivers are able to operate in a “wraparound” mode.
This allows output data to be monitored by the receiver section
and returned to the decoder where it can be checked for errors.
TRANSFORMERS
In selecting isolation transformers to be used with the BU-63152,
there is a limitation on the maximum amount of leakage induc-
tance. If this limit is exceeded, the transmitter rise and fall times
may increase, possibly causing the bus amplitude to fall below
the minimum level required by MIL-STD-1553. In addition, an
excessive leakage imbalance may result in a transformer dynam-
ic offset that exceeds 1553 specifications.
The maximum allowable leakage inductance is 6.0 µH, and
is measured as follows:
The side of the transformer that connects to the BU-63152 is
defined as the “primary” winding. If one side of the primary is
shorted to the primary center-tap, the inductance should be
measured across the “secondary” (stub side) winding. This
inductance must be less than 6.0 µH. Similarly, if the other side
of the primary is shorted to the primary center-tap, the induc-
tance measured across the “secondary” (stub side) winding must
also be less than 6.0 µH.
The difference between these two measurements is the
“differential” leakage inductance. This value must be less than
1.0 µH.
Beta Transformer Technology Corporation (BTTC), a subsidiary
of DDC, manufactures transformers in a variety of mechanical
configurations with the required turns ratios of 1:2.5 direct cou-
pled, and 1:1.79 transformer coupled. TABLE 2 provides a listing
of many of these transformers.
For further information, contact BTTC at 631-244-7393 or at
www.bttc-beta.com.
5
DS-BU-63152-M
3/13
RECEIVER OPERATING MODE
The receiver section accepts data from a MIL-STD-1553 Data
Bus when properly coupled in either of the two possible configu-
TX Data In
TX Data In
LINE-TO-LINE
OUTPUT
LINE-TO-LINE
INPUT
RX Data Out
RX Data Out
Notes:
(1) TX Data In and RX Data Out are TTL signals.
(2) TX Data In inputs must be at opposite logic levels during transmission, and at
a low logic level when not transmitting.
(3) LINE-TO-LINE output voltage is measured between TX Data Out and TX Data Out.
(4) LINE-TO-LINE input voltage is measured on the Data Bus.
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