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PDF ACT4808N Data sheet ( Hoja de datos )
| Número de pieza | ACT4808N | |
| Descripción | Dual Transceivers | |
| Fabricantes | Aeroflex Circuit Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ACT4808N (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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Standard Products
ACT4808N Dual Transceivers
for MACAIR (A3818, A4905, A5232, A5690) and MIL-STD-1553A/B
www.aeroflex.com/Avionics
May 25, 2005
FEATURES
❑ ACT4808N Dual Transceiver meets MIL-STD-1553A & B, Macair A3818, A5690,
A5232 and A4905 specs
❑ New Low Power Model
❑ Operates with ±12V to ±15V & +5V Power Supplies
❑ Voltage source output
❑ Plug-in or Flat Package
❑ Monolithic construction
❑ Designed for commercial, industrial and aerospace applications
❑ MIL-PRF-38534 compliant devices available
❑ Aeroflex-Plainview is a Class H & K MIL-PRF-38534 manufacturer
GENERAL DESCRIPTION
The Aeroflex-Plainview ACT4808N is a monolithic transceiver design which provides full compliance with Macair
(A-3818, A-4905, A-5232 and A-5690) and MIL-STD-1553A/B data bus requirements and can be considered a
"Universal" Transceiver.
The dual channel transceiver performs the front-end analog function of inputting and outputting data through a
transformer to the MIL-STD-1553 or Macair data bus.
Design of this transceiver 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 ACT4808N series active
transmit 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 as
well as low duty cycles. The receiver input threshold is set Internally.
TRANSMITTER
The Transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a 1:1 transformer
the data bus signal produced is 7.0 Volts typical P-P at Point 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” signal
applied to the “INHIBIT” takes priority over the condition of the data inputs and disables the transmitter (See
Transmitter Logic Waveform, 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 (Point A-A’). The Transmitter may be safely operated for an indefinite period with the 1553
bus (Point A) short circuited at 100% duty cycle.
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 Waveform, Figure 2).
The internal threshold is nominally set to detect data bus signals exceeding 1.10 Vp-p and reject signals less than 0.6
Vp-p when used with a 1:1 turns ratio transformer (See Figure 4 for transformer data and typical connection).
A low level at the Strobe input inhibits the DATA and DATA outputs.
SCD4808N Rev B
1 page  
TYPICAL HYBRID POWER DISSIPATION *, PER CHANNEL
Power Supply
Conditions
Condition
PSC1
VCC = +15V
VEE = -15V
VL = +5V
PSC2
VCC = +15V
VEE = -12V
VL = +5V
Point B-B'
ZO = 70 Ω,
VO = 29 VPK-PK
Bit Pattern = FFFFHEX
Figure 4
PSC3
VCC = +12V
VEE = -12V
VL = +5V
* See Aeroflex Application note# 112 for reference.
Standby
0.540
100% Duty
Cycle
2.167
Unit
Watts
0.465
1.852
0.450
1.600
RECOMMENDED POWER SUPPLY VOLTAGE RANGE
+V +11.4 Volts to +15.75 Volts
-V
Logic
-11.4 Volts to -15.75 Volts
+4.5 Volts to +5.5 Volts
Notes:
1. VCC = +15Volts ±0.75V, VEE = -15Volts ±0.75V, VIL = +5Volts ±0.5V, TC = -55°C to +125°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 4, in accordance with MIL-STD-1553B paragraph 4.5.2.2.2.3.
5. At Point A-A' on Figure 3 or 4, 2.5 µS after midpoint crossing of the parity bit of the last word of a 660 µS message.
6. Receiver skew is defined as the time from the rising edge of RX DATA OUT to the rising edge of RX DATA OUT minus 500 nS, with
a sine wave input of 3 Vpk-pk at 1MHz driven into Point B-B' of Figure 4 or 2.1 Vpk-pk at 1MHz driven into Point B-B' of Figure 3. The
specification maximum is guaranteed for TA = 25°C only. Standard TTL loads applied to RX DATA Outputs.
7. 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.
SCD4808N Rev B
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ACT4808N.PDF ] | |
Hoja de datos destacado
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| ACT4808DFI | ACT4808 DUAL TRANSCEIVERS FOR MACAIR A3818/ A5690/ A5232/ A4905 & MIL-STD-1553 | Aeroflex Circuit Technology |
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