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PDF 4444 Data sheet ( Hoja de datos )
| Número de pieza | 4444 | |
| Descripción | Transceiver for MIL-STD-1553 /MACAIR in a Chipscale Package | |
| Fabricantes | Aeroflex Circuit Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de 4444 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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Standard Products
ACT4444 Transceiver
for MIL-STD-1553 / MACAIR in a Chipscale Package
Preliminary
October 1, 2003
FEATURES
❑ Transceiver meets MIL-STD-1553A & B, Macair A3818, A4905, A5232 and A5690 specs
❑ Bipolar Supply ±15V to ±12V, Logic Supply +5V
❑ Replacement for function of CT3232 & ACT4404 in new designs
❑ Voltage source output
❑ Monolithic construction
❑ Aeroflex is a Class H & K MIL-PRF-38534 Manufacturer
❑ Miniature Chipscale Package Bumped Chip Carrier™ (BCC++)
NOTE: BCC++ and Bumped Chip Carrier are Trademarks of Fujitsu Ltd.
GENERAL DESCRIPTION
The Aeroflex Laboratories transceiver model ACT4444 is a monolithic transceiver which provides full compliance with Macair and
MIL-STD-1553 data bus requirements. The model ACT4444 performs the front-end analog function of inputting and outputting data through a
transformer to a MIL-STD-1553 or Macair data bus with a few external components.
The ACT4444 can be considered a "Universal" Transceiver in that it is compatible with MIL-STD-1553A, B, Macair A-3818, A-4905, A-5232
and A-5690.
Design of these transceivers reflects particular attention to active filter performance. This results in low bit and word error rate with superior
waveform purity and minimal zero crossover distortion. The ACT4444 active filter design has additional high frequency roll-off to provide the
required Macair low harmonic distortion waveform without increasing the pulse delay characteristics significantly.
Efficient transmitter electrical and thermal design provides low internal power dissipation and heat rise at high and well as low duty cycles.
An optional receiver input threshold adjustment can be accomplished by the use of the "External Threshold" terminals.
TRANSMITTER
The Transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a 1:1 transformer, isolated on the data bus
side with two 55 Ohm fault isolation resistors, and loaded by two 70 thru 85 Ohm terminations plus additional receivers, the data bus signal
produced is 7.0 Volts minimum P-P at A-A’ (See Figure 3 or 4). When both DATA and DATA inputs are held low or high, the transmitter output
becomes a high impedance and is “removed” from the line. In addition, an overriding “INHIBIT" input provides for the removal of the
transmitter output from the line. A logic “1” applied to the “INHIBIT” takes priority over the condition of the data inputs and disables the
transmitter (See Transmitter Logic Waveforms - Figure 1).
The transmitter utilizes an active filter to suppress harmonics above 1 MHz to meet Macair specifications A-3818, A-4905, A-5232 and A-5690.
The transmitter may be safely operated for an indefinite period at 100% duty cycle into a data bus short circuit.
RECEIVER
The Receiver section accepts bi-phase differential data at the input and produces two TTL signals at the output. The outputs are DATA and
DATA, and represent positive and negative excursions of the input beyond a pre-determined threshold (See Receiver Logic Waveforms -
Figure 2).
The internal threshold is nominally set to detect data bus signals exceeding 1.05 Volts P-P and reject signals less than 0.6 Volts P-P when used
with a 1:1 turns ratio transformer (See Figure 3 or 4 for transformer data and typical connections). This threshold setting can be held by
grounding the appropriate pins or modified with the use of external resistors.
A low level at the Strobe input inhibits the DATA and DATA outputs. If unused, a 2K Ohm pull-up to +5 Volts is recommended.
SCD4444 Rev B
1 page  
TYPICAL HYBRID POWER DISSIPATION *
Power Supply
Conditions
Condition
PSC1
VCC = +15V
VEE = -15V
VL = +5V
Pt. B - B’, ZO = 70 Ω, VO = 29 VPK-PK
Bit Pattern = FFFFHEX
Figure 3 or 4
PSC2
VCC = +15V
VEE = -12V
VL = +5V
PSC3
VCC = +12V
VEE = -12V
VL = +5V
* See Aeroflex Application note# 112 for reference.
Standby
100% Duty
Cycle
Unit
0.540
2.167
0.465
1.852
Watts
0.450
1.600
RECOMMENDED POWER SUPPLY VOLTAGE RANGE
VCC +11.4 Volts to +15.75 Volts
VEE -11.4 Volts to -15.75 Volts
VL +4.5 Volts to +5.5 Volts
Notes:
1. VCC = +15Volts ±0.75V, VEE = -15Volts ±0.75V, VIL = +5Volts ±0.5V, TC = -40°C to +85°C, unless otherwise specified.
2. All typical values are measured at +25°C.
3. Characteristics guaranteed by design, not production tested.
4. Power ON/OFF, measured from 75KHz to 1MHz at Point A-A’ Figure 3 or 4, in accordance with MIL-STD-1553B paragraph
4.5.2.2.2.3.
5. At point A-A’ on Figure 3 or 4, 2.5µS after midpoint crossing of the parity bit of the last word of a 660 µS message.
6. This test is peformed while the Transceiver is reading its own transmission. This condition is called "Wraparound". Standard TTL
loads applied to RX DATA Outputs.
SCD4444 Rev B
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet 4444.PDF ] | |
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