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4444

更新时间： 2024-02-07 08:36:56

品牌	Logo	应用领域
艾法斯 - AEROFLEX		/
页数	文件大小	规格书
10页	212K
描述
Transceiver for MIL-STD-1553 /MACAIR in a Chipscale Package

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4444 数据手册

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

12 3 4 5 6 7...10

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与4444相关器件

型号	品牌	获取价格	描述	数据表
44441-1002	MOLEX	获取价格	Rectangular Power Connector, 2 Contact(s), Female, Receptacle,
44441-1003	MOLEX	获取价格	7.50mm Pitch Sabreâ¢ Receptacle Crimp Housin
44441-1004	MOLEX	获取价格	7.50mm Pitch Sabreâ¢ Receptacle Crimp Housin
44441-1005	MOLEX	获取价格	Rectangular Power Connector, 5 Contact(s), Female, Receptacle,
44441-1006	MOLEX	获取价格	7.50mm Pitch Sabreâ¢ Receptacle Crimp Housin
44441-2002	MOLEX	获取价格	Rectangular Power Connector, 2 Contact(s), 1 Row(s), Female, 0.295 inch Pitch, Polarized L
44441-2002	MOLEXKITS	获取价格	Plugs, Receptacles
44441-2003	MOLEXKITS	获取价格	Plugs, Receptacles
44441-2004	MOLEXKITS	获取价格	Free Hanging Plug and Receptacle
44441-2005	MOLEXKITS	获取价格	Free Hanging Plug and Receptacle

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