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ACT4808 Dual Transceivers for MACAIR A3818, A5690, A5232, A4905 & MIL-STD-1553
Features
* ACT4808 Dual Transceiver meets MIL-STD-1553A & B, Macair A3818, A5690, A5232 and A4905 specs * New Low Power Model -L Available * Operates with 12V to 15V & +5V Power Supplies * Voltage source output for higher bus drive power * Plug-in or Flat Package * Monolithic construction using linear ASICs * Processed and Screened to MIL-STD-883 specs
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CIRCUIT TECHNOLOGY
General Description:
The Aeroflex Laboratories transceiver model ACT4808 is a new generation Dual monolithic transceiver which provides full compliance with Macair and MIL-STD-1553 data bus requirements The model ACT4808 performs the front-end analog function of inputting and outputting data through a transformer to a MIL-STD-1553 or Macair data bus. The ACT4808 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 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 ACT4808 series 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.The receiver input threshold is set Internally.
ACT4808 Transceiver
TX DATA OUT TX DATA IN TX DATA IN V+ TX INHIBIT DRIVER SHAPING OUTPUT STAGE TX DATA OUT
COMP.
RX DATA OUT
Transmitter
The Transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus as per Figure 3 or 4 and by two 70 Ohm terminations (ZO), the data bus signal produced is 6.5 Volts minimum P-P at A-A'. When both DATA and DATA
+5 V VEE RX DATA IN RX DATA IN VCC STROBE INPUT AMP
V-
ACTIVE FILTER
COMP.
RX DATA OUT
Block Diagram (without Transformer), 1/2 of unit shown
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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 (Pt. A-A').
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 1.10 Volts P-P and reject
signals less than 0.6 Volts P-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.
Figure 1 - Transmitter Logic Waveforms
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 2 - Receiver Logic Waveforms
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
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Absolute Maximum Ratings, Per Channel
Operating Case Temperature Storage Case Temperature Power Supply Voltages 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 Junction-Case, Thermal Resistance 16 V -0.3 V to +5.5 V 40 V 10V 150 mA 3.6 Watts 18C 5C/W -55C to +125C -65C to +150C +7 V
Electrical Characteristics Per Channel, Transmitter Section 1/ 2/
Input Characteristics, TX DATA IN or TX DATA IN Parameter Condition
"0" Input Current "1" Input Current "0" Input Voltage "1" Input Voltage VIN = 0.4 V VIN = 2.7 V -
Symbol
IILD IIHD VIHD VIHD
Min
2.0
Typ
-0.2 1.0 -
Max
-0.4 40 0.7 -
Unit
mA A V V
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 * VIN = 0.4 V VIN = 2.7 V 3/ 4/ IILI IIHI VILI VIHI tDXOFF tDXON VNOI ZOI 2 2K -0.2 1.0 300 300 0.8 -0.4 40 0.7 450 450 10 mA A V V nS nS mVp-p
* See Aeroflex Application note# 113 for reference.
Output Characteristics
Differential output - Direct coupled stub Differential output - Transformer coupled stub (see Fig. 3 and 4) Differential output offset - Direct coupled stub Fig. 4 Differential output offset - Xformer coupled stub Fig. 3 Differential output rise / fall times (see Fig. 5) Delay from 50% point of TX DATA or TX DATA input to zero crossing of differential output.
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Pt. B - B' ZO = 70
VO
26 18 200
29 21 250 240
32 25 360 250 300 300
Vp-p Vp-p mVpk mVpk nS nS
5/ 10% - 90% 3
VOS tR & tF tDTX
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Electrical Characteristics Per Channel, Receiver Section 1/ 2/
Parameter
Differential Input Impedance Differential Input Voltage Range Input Common Mode Voltage Range Common Mode Rejection Ratio
Condition
f = 1MHz -
Symbol
ZIN VIDR VICR CMRR
Min
10K 10 40
Typ
-
Max
40 -
Unit
Vp-p Vp-p dB
Strobe Characteristics (Logic "0" Inhibits Output)
"0" Input Current "1" Input Current "0" Input Voltage "1" Input Voltage Strobe Delay (Turn-on or Turn-off) VS = 0.4 V VS = 2.7 V IIL IIH VIL VIH tSD 2.0 -0.2 1.0 -0.4 +40 0.7 150 mA A V V nS
Threshold Characteristics (Sinewave Input )
Internal Threshold Voltage Fig. 4 Pt. B - B' 1MHz VTH 0.60 0.80 1.10 Vp-p
Output Characteristics, RX DATA and RX DATA
"1" State "0" State Receiver Output Skew Delay (average), from differential input zero crossings to RX DATA and RX DATA output 50% points IOH = -0.4 mA IOL = 4 mA 6/ 7/ VOH VOL tRXSK tDRX 2.5 3.6 0.35 300 0.5 10 450 V V nS nS
Power Supply Currents Per Channel 1/ 2/
VCC = +12V to +15V, VEE = -12V to -15V, VL = +5V
Std Version Duty Cycle Condition
Pt. B - B' ZO = 70 , VO = 29 VPK-PK Bit Pattern = FFFFHEX Fig. 4
-L Version Unit Typ
5 25 18 20 40 18 40 60 18 85 105 18
Symbol Typ Max
60 75 35 85 105 35 110 130 35 160 180 35
Max
10 35 30 30 60 30 60 80 30 120 140 30
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Transmitter Standby
ICC IEE IL ICC IEE IL ICC IEE IL ICC IEE IL
4
30 50 25 50 70 25 75 45 25 120 140 25
25%
mA
50%
100%
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SCD4808 REV E 12/9/99
Typical Hybrid Power Dissipation*, Per Channel
Std Version Power Supply Conditions
PSC1 VCC = +15V VEE = -15V VL = +5V PSC2 VCC = +15V VEE = -12V VL = +5V PSC3 VCC = +12V VEE = -12V VL = +5V
-L Version Standby 100% Duty Cycle Unit
Condition Standby
Pt. B - B' ZO = 70 , VO = 29 VPK-PK Bit Pattern = FFFFHEX Fig. 4
100% Duty Cycle
1.325
3.250
0.540
2.167
1.118
3.142
0.465
1.852
Watts
1.085
2.472
0.450
1.600
* See Aeroflex Application note# 112 for reference.
Recommended Power Supply Voltage Range
+V -V Logic +11.4 Volts to +15.75 Volts -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 = -55C to +125C, unless otherwise specified. 2. All typical values are measured at +25C. 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 S after midpoint crossing of the parity bit of the last word of a 660 S 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 Pt. B-B' of Figure 4 or 2.1 VPK-PK at 1MHz driven into Pt. B-B' of Figure 3. The specification maximum is guaranteed for TA = 25C 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.
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Terminal
TRANSCEIVER UNDER TEST TX DATA OUT RX DATA IN RX DATA OUT RX DATA OUT Isolation Transformer 1:N Coupling Transformer 1 : 1.414 R Zo
B
Isolation Resistors R = 0.75 ZO
A
B'
TX DATA OUT RX DATA IN
R
Data Bus Wire Pair
A'
Zo
Transformer turns ratio: N = 0.707 Recommend Technitrol 1553-1
Terminal Input Impedance B - B' MIL-STD-1553B para 4.5.2.1.2.3 1K minimum. 75KHz - 1MHz
Figure 3 - Databus Interface Using Transformer Coupling (Figure 9, MIL-STD-1553B)
Terminal
TRANSCEIVER UNDER TEST TX DATA OUT RX DATA IN RX DATA OUT RX DATA OUT Isolation Transformer 1:N 55 Zo
B
A
B'
TX DATA OUT RX DATA IN
55
Data Bus Wire Pair
A'
Zo Transformer turns ratio: N=1 Recommend Technitrol 1553-1
Terminal Input Impedance B - B' MIL-STD-1553B para 4.5.2.2.2.3 2K minimum. 75KHz - 1MHz
Figure 4 - Databus Interface Using Direct Coupling (Figure 10, MIL-STD-1553B)
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Figure 5 - Transmitter (TX) Output Wave form
tf* 90%
Figure 6 - Transmitter (TX) Output offset
LAST BIT
Magnified View
OUTPUT OFFSET*
6.5V P-P MIN 8.0V P-P MAX
0 Volts
0 Volts
OUTPUT OFFSET*
10% 2.5 sec tr* * Rise and fall times measured at point A-A' in Figure 3 or 4 *Offset measured at point A-A' in Figure 3 or 4
Figure 7 - Typical Hybrid Power Dissipation vs. Duty Cycle (Per Channel)
4.0 3.6 3.2 POWER DISSIPATION WATTS
Figure 8 - Typical Hybrid Power Dissipation vs. Duty Cycle (Per Channel) -L Version
4.0 3.6 3.2 POWER DISSIPATION WATTS 2.8 2.4 2.0 1.6 1.2 0.8 0.4
PSC 3 PSC 1 PSC 2
2.8 2.4 2.0 1.6 1.2 0.8 0.4 0 0 10 20 30 40 50 60 70 80 90 100
PSC 1 PSC 3 PSC 2
0 0
10
20
30
40
50
60
70
80
90 100
DUTY CYCLE, PERCENT
DUTY CYCLE, PERCENT
Configurations and Ordering Information
Model Number's.
ACT4808D ACT4808LD ACT4808DF ACT4808LDF ACT4808DI ACT4808LDI ACT4808DFI ACT4808LDFI
DESC No.
TBA
Receiver Data level
Normally Low
Case
Plug In
TBA
Normally Low
Flat Pack
TBA
Normally High
Plug In
TBA
Normally High
Flat Pack
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CIRCUIT TECHNOLOGY
Dual In Line
1.90 MAX 0.085 .097 36 0.78 MAX 18 Pin 1 & ESD Designator 0.24 MIN 1.70 19 0.600
Pin Numbers & Functions
Pin # 1 2 3 4 5 6 7 8 9 10 11 Function TX DATA OUT TX DATA OUT GROUND NC RX DATA OUT STROBE GROUND RX DATA OUT CASE TX DATA OUT TX DATA OUT GROUND NC RX DATA OUT STROBE GROUND RX DATA OUT NC VCC RX DATA IN RX DATA IN GROUND 3 VEE +5V INHIBIT TX DATA IN TX DATA IN VCC RX DATA IN RX DATA IN GROUND VEE +5 V INHIBIT TX DATA IN TX DATA IN B B B B B B B B B A A A A A A A A A B B B B B B B A A A A Channel A A A
0.018 DIA. 0.002
12 13 14 15 16
18
Flat Package
0.78 MAX
19
17
0.015 0.002
18 19 20
1.90 MAX 0.10 Typ
21 22 23 24
36
0.086 R 4 Places Pin 1 & ESD Designator 0.010 0.002
25 26 27 28 29 30 31 32 33 34 35 36
0.097
0.175 MAX
0.40 MIN 2 SIDES
0.065 REF
Notes 1. Dimensions shown are in inches 2. Pins are equally spaced at 0.1000.002 tolerance, non-cumulative, each row Specifications subject to change without notice.
Aeroflex Circuit Technology 35 South Service Road Plainview New York 11803
Aeroflex Circuit Technology
Telephone: (516) 694-6700 FAX: (516) 694-6715 Toll Free Inquiries: 1-(800) THE-1553
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