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ACT4419D Dual Variable Amplitude Transceivers
for MIL-STD-1553
Features
* World's smallest and lowest standby power dual variable amplitude transceiver 0.3" x 1.2" packages * Lowest standby power * Dual transceiver meets military data bus requirements, MIL-STD-1553 * Low power dissipation at full output power * Single +5V power supply * Current source output * Monolithic construction using Dielectrically Isolated (D.I.) * Processed and screened to MIL-STD-883 specs * Radiation Hard to 300 KRADS total dose * DESC SMD pending * +5V Control line
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General Description
The Aeroflex Circuit Technology model ACT4419D is a next generation D.I. monolithic transceiver which provides variable amplitude in full compliance with MIL-STD-1553 data bus requirements with the lowest standby power consumption available and one power supply operation. The dual channel model ACT4419D performs the front-end analog function of inputting and outputting data through a transformer to a MIL-STD-1553 data bus. 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. Efficient transmitter electrical and thermal design provides low internal power dissipation and heat rise at high as well as low duty cycles. Variable amplitude is adjusted with factory preset 0 - 5 Vdc control line at 1 mA maximum input current at 5 Volts.
ACT4419D Dual Transceivers
Channel B TX/RX TX DATA IN TX DATA IN DRIVER SHAPING OUTPUT STAGE TX/RX
VCONT
TX INHIBIT Channel A +5 V Channel B GROUND REFERENCE COMP. RX DATA OUT
Transmitter
The Transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a primary grounded center tap 1:2.5 transformer, isolated on the data bus side with two 52.5 Ohm fault isolation resistors, and loaded by two 70 Ohm terminations plus additional
INPUT AMP
ACTIVE FILTER
COMP.
RX DATA OUT
STROBE
Block Diagram (without Transformer, Channel A shown)
eroflex Circuit Technology - Data Bus Modules For The Future (c) SCD4419D REV G 5/10/00
receivers, the data bus signal produced is 7.1 Volts nominal P-P at A-A' (See Figure 5). When both DATA and DATA inputs are held low, 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 Waveform, Figure 1). The transceiver utilizes an active
filter to suppress harmonics above 1MHz. The Transmitter may be safely operated at 100% duty cycle for an indefinite period into a short circuited 1553 bus.
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). Note: Receiver outputs are normally low.
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The pre-set internal thresholds will detect data bus signals exceeding 1.150 Volts P-P and reject signals less than 0.6 Volts P-P when used with a 1:2.5 turns ratio transformer. (See transformer data and typical connection, Figure 5).
Figure 1 - Transmitter Logic Waveforms
DATA IN
DATA IN
INHIBIT
LINE TO LINE OUTPUT NOTES: 1. DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them. 2. DATA and DATA must be in the same state during off time (both low).
Figure 2 - Receiver Logic Waveforms
LINE TO LINE INPUT
DATA OUT
DATA OUT
Note overlap
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SCD4419D REV G 5/10/00 Plainview NY (516) 694-6700
Absolute Maximum Ratings
Operating Case Temperature Storage Case Temperature Positive Power Supply Voltage Receiver Differential Input Receiver Input Voltage (Common Mode) Driver Peak Output Current Total Package Power Dissipation over the Full Operating Case Temperature Rise Maximum Junction To Case Temperature Rise for the Hottest Device Thermal Resistance, Junction to Bottom of Case -55C to +125C -65C to +150C +5.0 V to +7.0 V 10 V 5 V 650 mA 2 Watt
(Note: Normal operation conditions require one transmitter on and the other off at any given time.
10C 5C/W
Electrical Characteristics - Driver Section 1/ 3/
Input Characteristics, TX DATA IN or TX DATA IN Parameter
"0" Input Current "1" Input Current "0" Input Voltage "1" Input Voltage
Condition
VIN = 0.4 V VIN = 2.7 V -
Symbol
IILD IIHD VILD VIHD
Min
2.0
Typ
-0.2 1 -
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 2/ VIN = 0.4V VIN = 2.7V IILI IIHI VILI VIHI tDXOFF tDXON VNOI ZOI 2 2K -0.2 1.0 200 100 2 -0.4 40 0.7 300 180 10 mA A V V nS nS mVp-p
Output Characteristics
Differential output level (direct coupled stub) Differential output level (transformer coupled) Rise and Fall times Output Offset 4/ Delay from 50% point of TX DATA or TX DATA input to zero crossing of differential signal Output Voltage Delta, Pt. A - A' Output Voltage Delta, Pt. B - B' Control Line Input Resistance
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Pt. A - A' Pt. B - B' Pt. A - A' 3
VO VO tR & tF VOS tDTX VOD VOS RCONT
6.6 18.7 100 0 0 -
7.1 20.1 170 120 71 200 5
7.6 21.5 300 90 180 142 400 -
V p-p V p-p nS mV peak nS mVp-p mVp-p K
5/ 5/
SCD4419D REV G 5/10/00 Plainview NY (516) 694-6700
Electrical Characteristics - Receiver Section
Parameter
Differential Voltage Range Common Mode Rejection Ratio
1/ 3/
Condition
Pt. A - A' -
Symbol
VIDR CMRR
Min
45
Typ
-
Max
20 -
Unit
V peak dB
Strobe Characteristics (Logic "0" inhibits output) (NOTE: If not used, a 1K pullup to 5V is recommended)
"0" Input Current "1" Input Current "0" Input Voltage "1" Input Voltage Strobe Delay (turn-on) Strobe Delay (turn-off) VS = 0.4 V VS = 2.7V IIL IIH VIL VIH tSD(ON) tSD(OFF) 2.0 -0.2 1 90 90 -0.4 +40 0.7 150 150 mA A V V nS nS
Threshold Characteristics (Sinewave input )
Input Threshold Voltage(referred to the bus) 100KHz1MHz VTH 0.60 0.8 1.15 Vp-p
Output Characteristics, RX DATA and RX DATA
"1" State "0" State Delay, (average)from differential input zero crossings to RX DATA and RX DATA output 50% points IOH = -0.4 mA IOL = 4 mA VOH VOL tDRX 2.5 3.5 0.3 320 0.5 400 V V nS
Power Data
1/ 3/
Maximum Current per Channel (other channel in standby) Duty Cycle Typ
Transmitter Standby 25% duty cycle 50% duty cycle 100% duty cycle 50 mA 155 mA 290 mA 560 mA
Max
65 mA 185 mA 335 mA 650 mA
Power Supply Voltage Range
+V 4.75 to 5.5 Volts
Notes: 1. VCC = 5 Volts 0.1 V, TC = -55C to +125C, unless otherwise specified. 2. Power ON/OFF, measured from 75KHz to 1MHz at Point A-A'. See Figure 5. 3. All typical values are measured at +25C. 4. At point A-A' on Figure 5, 2.5 S after midpoint crossing of the parity bit of the last word of a 660 S message. 5. Output Voltage Delta (VO) = VO(IDEAL) - VO(MEASURED), where VO(IDEAL) = Slope x VCONT and Slope = VO / VCONT, See Figure 3.
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SCD4419D REV F 2/10/00 Plainview NY (516) 694-6700
Figure 3 - Transmitter Output Amplitude (VO) vs VCONT Voltage
VO PK-PK @ A-A' 7.1 FS
Figure 4 - Transmitter (TX) Output Offset
LAST BIT
5.68 OUTPUT AMPLITUDE
Slope = VO /
VCONT
0.8FS
Magnified View
OUTPUT OFFSET*
4.26
0.6FS
OUTPUT OFFSET*
2.84
0.4FS
2.5 sec
1.42
0.2FS
*Offset measured at point A-A' in Figure 5
0 0 VCONT dc 1 2 3 4 5 CONTROL VOLTAGE
Figure 5 - Typical Transformer Connection
70 70 ZO
Figure 6 - Power Dissipation vs. Duty Cycle (Total hybrid with one channel transmitting and the other in standby)
1600 1:2.5 P B 55 A Center Tap P' B' 55 RX DATA IN RX DATA IN VCONT = 0 - 5Vdc 0 0 10 20 30 40 50 60 70 80 90 100 A' 1:1.77 for stub coupling POWER DISSIPATION MILLIWATTS 1400 1200 1000 800 Typical 600 400 200 Maximum
TX DATA OUT D.U.T
TX DATA OUT
Transformer: Use Technitrol 1553-45 or Equivalent
DUTY CYCLE - PERCENT
Note: Vcc = 5 Volts, Vbus (Pt. A-A') at 7.1 Volts P-P
Configurations and Ordering Information
Model No.
ACT4419-D * ACT4419-DF *
DESC No.
Pending Pending
Receiver Data level
Normally Low Normally Low
Case
DIP Flat Package
Specs.
1553 1553
Configuration
Dual Dual
* For 10V Control voltage consult factory.
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SCD4419D REV G 5/10/00 Plainview NY (516) 694-6700
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Package Dimensions and Pin Outs
Pin #'s & Functions Flat Package
1.200 MAX .900 9 Equal Spaces @.100 .030 .010 .100 .005 .310 MAX .175 or .300 MIN MIN
ESD Triangle Identifies Pin 1
1 2 .140 MAX .065 .015 3 4 5 6 7 .010 .002 TYP 8 9 10 11
VCONT A & B (0 - 5Vdc) TX/RX A TX/RX A STROBE A GROUND A +5Vdc A & B TX/RX B TX/RX B STROBE B GROUND B RX DATA OUT B RX DATA OUT B TX INHIBIT B TX DATA IN B TX DATA IN B RX DATA OUT A RX DATA OUT A TX INHIBIT A TX DATA IN A TX DATA IN A
.040 .018 .002
DIP Package
1.200 MAX .900 9 Equal Spaces @.100 .100 .005 .170 MIN .140 MAX
12 13 14 15 .310 MAX .300 .010 16 17 18
ESD Triangle Identifies Pin 1
19
Notes 1. Dimensions shown are in inches
20
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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SCD4419D REV F 2/10/00 Plainview NY (516) 694-6700

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