Dual Transceivers. ACT4808N Datasheet

ACT4808N Transceivers. Datasheet pdf. Equivalent

ACT4808N Datasheet
Recommendation ACT4808N Datasheet
Part ACT4808N
Description Dual Transceivers
Feature ACT4808N; Standard Products ACT4808N Dual Transceivers for MACAIR (A3818, A4905, A5232, A5690) and MIL-STD-155.
Manufacture Aeroflex Circuit Technology
Datasheet
Download ACT4808N Datasheet





Aeroflex Circuit Technology ACT4808N
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



Aeroflex Circuit Technology ACT4808N
TX DATA IN
TX DATA IN
TX INHIBIT
VCC
+5 V
VEE
RX DATA IN
RX DATA IN
STROBE
DRIVER
INPUT
AMP
TRANSMIT
ACTIVE
FILTER
OUTPUT
STAGE
V+
V-
RECEIVE
ACTIVE
FILTER
COMP.
COMP.
TX DATA OUT
TX DATA OUT
RX DATA OUT
RX DATA OUT
BLOCK DIAGRAM (WITHOUT TRANSFORMER)
DATA IN
DATA IN
INHIBIT
LINE TO LINE
OUTPUT
NOTES:
1. Line to line waveforms illustrate Macair signals, MIL-STD-1553 signals are trapezoidal.
2. DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them.
3. DATA and DATA must be in the same state during off time (both high or low).
FIGURE 1 – TRANSMITTER LOGIC WAVEFORMS IDEALIZED
LINE TO LINE
INPUT
DATA OUT
DATA OUT
Note overlap
NOTE: Waveforms shown are for normally low devices. For normally high receiver output
level devices, the receiver outputs are swapped as shown by the dashed lines.
FIGURE 2 – RECEIVER LOGIC WAVEFORMS IDEALIZED
SCD4808N Rev B
2



Aeroflex Circuit Technology ACT4808N
ABSOLUTE MAXIMUM RATINGS
Operating Case Temperature
Storage Case Temperature
Power Supply Voltages (VCC, VEE, VL)
Logic Input Voltage
Receiver Differential Input
Receiver Input Voltage (Common Mode)
Driver Peak Output Current
Total Package Power Dissipation over the Full Operating
Case Temperature Range
Maximum Junction to Case Temperature
Thermal resistance – Junction to Case
-55°C to +125°C
-65°C to +150°C
±12VDC to ±18VDC
+5VDC to +7VDC
-0.3 VDC to +5.5 VDC
±40 VP-P
±10 V
150 mA
3.25 Watts
(Note: Normal operation conditions require one transmitter
on and the other off at any given time)
16.25°C
5°C/W
ELECTRICAL CHARACTERISTICS – DRIVER SECTION 1/ 2/
INPUT CHARACTERISTICS, TX DATA IN or TX DATA IN
Parameter
Condition
Symbol
Min Typ
Max
"0" Input Current
"1" Input Current
"0" Input Voltage
"1" Input Voltage
VIN = 0.4V
VIN = 2.7V
-
-
IILD
IIHD
VILD
VIHD
- -0.1 -0.2
- 1 40
- - 0.7
2.0 -
-
INHIBIT CHARACTERISTICS
"0" Input Current
"1" Input Current
"0" Input Voltage
"1" Input Voltage
Delay from TX inhibit, (01) to inhibited output
Delay from TX inhibit, (10) to active output
Differential Output Noise, inhibit mode
Differential Output Impedance *
* See Aeroflex Application note# 113 for reference.
VIN = 0.4V
VIN = 2.7 V
-
-
-
-
3/
4/
IILI
IIHI
VILI
VIHI
tDXOFF
tDXON
VNOI
ZOI
- -0.1 -0.2
- 1.0 40
- - 0.7
2--
- 350 700
- 300 500
- 0.8 10
2K -
-
OUTPUT CHARACTERISTICS
Differential output - Direct coupled stub
Differential output - Transformer coupled stub
(See Figures 3 and 4)
Point B- B'
ZO = 70Ω
VO
26 29 32
18 21 25
Differential output offset - Direct coupled stub Fig. 4
Differential output offset - Xformer coupled stub Fig. 3
5/
VOS VOS - ±360
- ±250
Differential output rise / fall times (see Figure 5)
10% - 90%
Delay from 50% Point of TX DATA or TX DATA input
to zero crossing of differential output.
tR & tF
tDTX
200 250 300
- 240 300
SCD4808N Rev B
3
Unit
mA
µA
V
V
mA
µA
V
V
nS
nS
mVp-p
Ω
Vp-p
Vp-p
mVpk
mVpk
nS
nS





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