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| ACT 4487 DUAL TRANSCEIVER FOR MIL-STD-1553/1760 Features * +5 / 15 Volt Supply Operation * Low Power Dissipation * Small Size & Light Weight * Dual Transceivers Saves Space & Cost * Outstanding MIL-STD-1553 performance * Radiation Hard Dielectric Isolation Monolithic Construction for Severe Environments * Superior High Frequency Line Transient and Input Ripple Rejection * Input and Output TTL Compatible Design * Processed and Screened to MIL-STD-883 Specs * MIL-PRF-38534 Compliant Devices Available * DESC SMD (Standard Military Drawing) www.aeroflex.com/act1.htm CIRCUIT TECHNOLOGY General Description The Aeroflex Circuit Technology ACT 4487 is a next generation monolithic transceiver design which provides full compliance to MIL-STD-1553A/B and 1760 requirements in a small package with low power consumption. The ACT 4487 series performs the front-end analog function of inputting and outputting data through a transformer to the MIL-STD-1553 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. Efficient transmitter electrical and thermal design provides low internal power dissipation and heat rise at high as well as low duty cycles. Each channel of the dual transceiver is completely separate from the other and fully independent. This includes power leads as well as signal lines. Hence, each channel may be connected to a different data bus with no interaction. TX DATA OUT TX DATA IN DRIVER TX DATA IN ACTIVE FILTER OUTPUT STAGE TX DATA OUT TX INHIBIT IN +5V (VL) +15V (VCC) -15V (VEE) GND1 GND2 GND3 RX DATA IN RX DATA IN CASE RX STROBE IN INPUT AMPLIFIER ACTIVE FILTER RX DATA OUT COMP. 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 1.4:1 ratio transformer, isolated on the data bus side with two 52.5 Ohm fault isolation resistors, and loaded by two 70 Ohm Block Diagram (Without Transformer) eroflex Circuit Technology - Data Bus Modules For The Future (c) SCD4487D REV B 3/10/98 terminations, the data bus signal is typically 7.5 Volts P-P at point A (See Figure 5). 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 may be safely operated for an indefinite period with the 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 pre-set internal thresholds will detect data bus signals, point A Figure 5, exceeding 1.20 Volts P-P and reject signals less than 0.6 Volts P-P when used with a transformer (See Figure 5 for transformer data and typical connection). A low level at the RX Strobe input inhibits the DATA and DATA outputs. If unused, a 2K pull-up to +5 Volts is recommended. Figure 1 -- Transmitter Logic Waveforms Idealized DATA IN DATA IN INHIBIT LINE TO LINE OUTPUT Note: DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them, and must be in the same state during off times (both high or low). Figure 2 -- Receiver Logic Waveforms Idealized (ACT4487D) LINE TO LINE INPUT STROBE DATA OUT DATA OUT Note overlap Aeroflex Circuit Technology 2 SCD4487D REV B 3/10/98 Plainview NY (516) 694-6700 Absolute Maximum Ratings Operating case temperature Storage case temperature Power supply voltage 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 rise Maximum junction to case temperature Thermal resistance - junction to case -55C to +125C -65C to +150C -0.3 V to +18 V +0.3 V to-18 V -0.3 V to +7.0 V -0.3 V to +5.5 V 40 VP-P 10 V 300 mA 2.5 Watts (Note: Normal operation conditions require one transceiver on and the other off) 10C 4C/W Electrical Characteristics -- Driver Section Input Characteristics, TX DATA IN or TX DATA IN (Notes 2 & 3 apply) 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 VIHD VIHD Min Typ -0.1 1 Max -0.2 40 0.7 Unit mA A V V 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 (inhibited) Note 1 See Figure 5 Point B Point C From mid pt inhibit to 1.2V pt B, See Figure 5 VIN = 0.4 V VIN=2.7V IILI IIHI VILI VIHI tDXOFF tDXON VNOI ZOI ZOI 2K 1K 2.0 175 90 2 225 150 10 -0.1 1.0 -0.2 40 0.7 mA A V V nS nS mVP-P Output Characteristics Differential output level, See Figure 5 See Figure 5 Rise and fall times(10% to 90% at pt A output) See Figure 5 Output offset, Figure 3, 2.5S after midpoint crossing of the parity bit of the last word of a 660S message See Figure 5 Delay from 50% point of TX DATA or TX DATA input to zero crossing of differential signal. See Fig 5 Aeroflex Circuit Technology Point A Point A Point A Point A 3 VO tr VOS tDXT 6 100 7.5 160 9 300 90 VP-P nS mV peak nS 100 200 SCD4487D REV B 3/10/98 Plainview NY (516) 694-6700 Electrical Characteristics -- Receiver Section Parameter Differential Receiver Input Voltage Range (See Figure 5, Point B) Common Mode Rejection Ratio (Note 3) "1" State - Rx Data or Rx Data Output "0" State - Rx Data or Rx Data Output Delay (average) from Differential Input Zero Crossings to RX DATA and RX DATA Output 50% points Input Threshold Voltage (referred to the bus) 100KHz-1MHz IOH = -0.4 mA IOI = 4 mA Condition TXFMR 1.4:1 Symbol VIDR CMRR VOH VOL tDXT VTH Min Typ Max 40 Unit VP-P dB 45 2.5 3.7 0.35 270 0.60 0.75 0.5 400 1.20 V V nS VP-P 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=0.4V VS=2.7V IIL IIH VIL VIH tSD 2.0 50 100 -0.1 1 -0.2 +40 0.7 mA A V V nS Power Data Power Supply Currents - Per Channel - See Figure 4 Transmitter Standby ICC IEE IL ICC IEE IL ICC IEE IL ICC IEE IL 0 12 18 45 12 18 90 12 18 180 12 18 1 16 30 50 20 30 100 20 30 200 20 30 25% duty cycle mA 50% duty cycle 100% duty cycle Power Supply Voltages 15V Operating Power Supply Voltage Range +5V Operating Power Supply Voltage Range) VCC VEE VL +14.25 +15.00 +15.75 -14.25 -15.00 -15.75 +4.50 +5.00 +5.50 V V Note 1. Power on or off, measured from 75KHz to 1MHz at point A and transformer self impedance of 3K minimum at 1MHz. Note 2: Power Supplies: 15 Volts 0.75 V & +5 Volts 0.5 V, bypassed by 10 F (Tantalum recommended) Capacitor minimum. All measurements & specifications apply over the temperature range of -55C to +125C (case temperature) unless otherwise specified. Note 3: When measured as shown per Figure 5 with 10 Volt peak, line to ground, DC to 2MHz Note 4: Typical power is measured with VBUS at point A = 7.5 VP-P Aeroflex Circuit Technology 4 SCD4487D REV B 3/10/98 Plainview NY (516) 694-6700 Figure 3 - Transmitter (TX) Output Offset Figure 5 - Typical 1553 Bus Connections LAST BIT Transformer Coupled Stub 70 Magnified View OUTPUT OFFSET* ACT 4487 TX DATA OUT 2:1 3 2 7 C 1:1.4 52.5 0 Volts OUTPUT OFFSET* A TX DATA OUT 2.5 sec 1 5 T1553-2 Zoi VCM 52.5 RX DATA IN RX DATA IN *Offset measured at point A in Figure 5 Direct Coupled Stub Figure 4 - Hybrid Power Dissipation vs. Duty Cycle (Total hybrid with one channel transmitting and the other not powered - 100% Duty Cycle) 3600 3200 2.97W POWER DISSIPATION MILLIWATTS 2800 2400 2000 1600 1200 800 400 0 0 10 20 30 40 50 60 Typical Hybrid Dissipation Typical Hybrid Input Power 1.87W RX DATA IN TX DATA OUT RX DATA IN 1 4 T1553-2 52.5 Zoi 70 ACT 4487 TX DATA OUT 1.4:1 3 8 2 B 52.5 A 0.270 Transformer Model use Technitrol Part# 1553-2 or equivalent 70 80 90 100 DUTY CYCLE - PERCENT Note: Vcc= +15V, VEE = -15V, VL= +5V, Transformer ratio 1.4:1, VBUS (point A) at 7.5VP-P. Configurations and Ordering Information ACT Model # / Ordering Part # ACT 4487-D ACT 4487-DI ACT 4487-DF ACT 4487-DFI Specifications subject to change without notice. Aeroflex Circuit Technology Case Style DIP DIP FP FP DESC Number 5962-8757910X_ 5962-TBA 5962-8757910Y_ 5962-TBA Rx Standby Normally Low Normally High Normally Low Normally High 5 SCD4487D REV B 3/10/98 Plainview NY (516) 694-6700 Figure 6 - Lead Numbers & Functions ACT4487D Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Function TX DATA OUT TX DATA OUT GROUND 1 NC RX DATA OUT STROBE GROUND 2 RX DATA OUT CASE TX DATA OUT TX DATA OUT GROUND 1 NC RX DATA OUT STROBE GROUND 2 RX DATA OUT NC VCC RX DATA IN RX DATA IN GROUND 3 VEE +5 V (VL) INHIBIT TX DATA IN TX DATA IN VCC RX DATA IN RX DATA IN GROUND 3 VEE +5 V (VL) INHIBIT TX DATA IN TX DATA IN 6 Channel A A A A A A A B B B B B B B B B B B B B B B B A A A A A A A A A Aeroflex Circuit Technology SCD4487D REV B 3/10/98 Plainview NY (516) 694-6700 CIRCUIT TECHNOLOGY Model ACT4487D Dual In Line 1.90 MAX 0.085 .097 36 0.78 MAX 18 Pin 1 & ESD Designator 0.24 MIN 0.21MAX 1.70 19 0.600 0.018 DIA. 0.002 Model ACT4487D Flat Package 0.78 MAX 19 18 0.015 0.002 1.90 MAX 0.10 Typ 36 0.086 R 4 Places Pin 1 & ESD Designator 0.097 0.175 MAX 0.010 0.002 0.065 REF Notes 1. Dimensions shown are in inches 2. Pins are equally spaced at 0.1000.002 tolerance, non-cumulative, each row 0.40 MIN 2 SIDES Aeroflex Circuit Technology 35 South Service Road Plainview New York 11830 www.aeroflex.com/act1.htm Aeroflex Circuit Technology Telephone: (516) 694-6700 FAX: (516) 694-6715 Toll Free Inquiries: (800) THE-1553 E-Mail: sales-act@aeroflex.com 7 SCD4487D REV B 3/10/98 Plainview NY (516) 694-6700 |
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