Standard Products ACT4438 Transceiver for MIL-STD-1553 / 1760 in a Chipscale Package www.aeroflex.com/AVIONICS December 20, 2006 FEATURES ❑ Transceiver meets MIL-STD-1553 and MIL-STD-1760 ❑ Low power dissipation at full output power ❑ Single +5V power supply ❑ Receiver threshold control ❑ Current Source Transmitter Output ❑ Bipolar Monolithic Construction ❑ Aeroflex is a Class H & K MIL-PRF-38534 Manufacturer ❑ Designed for commercial, industrial and aerospace applications ❑ Integral heat sink ❑ Miniature Chipscale Package: QFN, Epad, 52 lead, 8 x 8 mm Weight: 0.2g GENERAL DESCRIPTION The Aeroflex Plainview Model ACT4438 is a next generation monolithic transceiver which provide full compliance with MIL-STD-1553/1760 and data bus requirements in a 52-lead Epad 8 x 8 mm QFN with the lowest standby power consumption and single power supply operation. The Model ACT4438 performs the front-end analog function of inputting and outputting data through a transformer to a MIL-STD-1553/1760 data bus with a few external components. 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. TRANSMITTER The Transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a 1:2.5 transformer, isolated on the data bus side with two 55 Ohm fault isolation resistors for direct stub coupling. The data bus signal produced for RISET = 2.7K Ohm is typically 7.5 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). The externally set (RTH) 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 Figure 5 for transformer data and typical connection). SCD4438 Rev J TX DATA IN TX DATA OUT DRIVER TX DATA IN SHAPING OUTPUT STAGE TX DATA OUT REFERENCE COMP. RX DATA OUT ACTIVE FILTER COMP. TX INHIBIT RISET +5 V GROUND RX DATA IN RX DATA IN INPUT AMP RX DATA OUT RTH HI RTH LO STROBE BLOCK DIAGRAM (WITHOUT TRANSFORMER) 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 high or low). FIGURE 1 – TRANSMITTER LOGIC WAVEFORMS LINE TO LINE INPUT DATA OUT DATA OUT Note overlap NOTE: Waveforms shown are for normally low devices. FIGURE 2 – RECEIVER LOGIC WAVEFORMS SCD4438 Rev J 12/20/06 2 Aeroflex Plainview ABSOLUTE MAXIMUM RATINGS Operating Case Temperature -40°C to +85°C Storage Case Temperature -65°C to +150°C Maximum Die Junction Temperature +125°C Positive Power Supply Voltage -0.3 V to +7.0 V Receiver Differential Input ±10 V Receiver Input Voltage (Common Mode) ±5 V Driver Peak Output Current 650 mA Total Package Power Dissipation over the full operating case temperature rise at 100% duty cycle 2.2 Watt ØJC 1°C/W ØJA 33°C/W Maximum Junction Temperature Rise over Case (Junction to Case) 2.2°C Maximum Junction Temperature Rise over Ambient (Junction to Ambient) 72.6°C ELECTRICAL CHARACTERISTICS – DRIVER SECTION INPUT CHARACTERISTICS, TX DATA IN OR TX DATA IN Parameter Condition Symbol Min Typ Max Unit "0" Input Current VIN = 0.4V IILD - -0.2 -0.4 mA "1" Input Current VIN = 2.7V IIHD - 1 40 µA "0" Input Voltage VILD - - 0.7 V "1" Input Voltage VIHD 2.0 - - V INHIBIT CHARACTERISTICS "0" Input Current VIN = 0.4V IILI - -0.2 -0.4 mA "1" Input Current VIN = 2.7V IIHI - 1.0 40 µA "0" Input Voltage VILI - - 0.7 V "1" Input Voltage VIHI 2 - - V Delay from TX inhibit, (0➝1) to inhibited output tDXOFF - 150 300 nS Delay from TX inhibit, (1➝0) to active output tDXON - 150 300 nS Differential Output Noise, inhibit mode VNOI - 2 10 mV p-p Note 1 ZOI 2K - - Ω ZO = 78Ω VO 6.5 7.5 9.0 V p-p tr 100 200 300 nS VOS - - ±90 mV peak tDTX - 100 300 nS Differential Output Impedance (inhibited) OUTPUT CHARACTERISTICS Differential output level at point A-A’ on Figure 5 Rise and Fall Times at point A-A’ on Figure 5 (10% to 90% of p-p output) Output Offset at point A-A’ on Figure 5, 2.5 µS after midpoint crossing of the parity bit of the last word of a 660 µS message ZO = 78Ω Delay from 50% point of TX DATA or TX DATA input to zero crossing of differential signal Note 1. Power ON/OFF, measured from 75KHz to 1MHz at Point A-A. See Figure 5. SCD4438 Rev J 12/20/06 3 Aeroflex Plainview ELECTRICAL CHARACTERISTICS – RECEIVER SECTION Parameter Condition Differential Voltage Range Common Mode Rejection Ratio Symbol Min Typ Max Unit VIDR - - 20 V peak CMRR 45 - - dB STROBE CHARACTERISTICS (LOGIC "0" INHIBITS OUTPUT) If not used, a 1K pullup to 5V is recommended "0" Input Current VS = 0.4V IIL - -0.2 -0.4 mA "1" Input Current VS = 2.7V IIH - 1 +40 µA "0" Input Voltage VIL - - 0.7 V "1" Input Voltage VIH 2.0 - - V Strobe Delay (turn-on) tSD(ON) - 90 200 nS Strobe Delay (turn-off) tSD(OFF) - 90 200 nS 0.60 0.8 1.15 V p-p THRESHOLD CHARACTERISTICS (SINEWAVE INPUT ) Input Threshold Voltage (Referred to the bus) 100KHz1MHz VTH OUTPUT CHARACTERISTICS, RX DATA AND RX DATA "1" State IOH = -0.4mA VOH 2.5 3.7 - V "0" State IOL = 4mA VOL - 0.3 0.5 V tDRX - 330 450 nS Delay, (average)from differential input zero crossings to RX DATA and RX DATA output 50% points MAXIMUM CURRENTS, (+5V) POWER DATA For RISET = 2.7KΩ Duty Cycle Typ Max Transmitter Standby 20 mA 30 mA 25% duty cycle 155 mA 185 mA 50% duty cycle 264 mA 335 mA 100% duty cycle 600 mA 650 mA POWER SUPPLY VOLTAGE +V 4.75 to 5.5 Volts Note 2. +V = 5 Volts ±0.1 V, for all measurements unless otherwise specified. Note 3. Specifications apply over the case temperature range of -40°C to +85°C unless otherwise specfied. Note 4. All typical values are measured at +25°C. SCD4438 Rev J 12/20/06 4 Aeroflex Plainview LAST BIT tf * 90% Magnified View OUTPUT OFFSET* 6.5V P-P MIN 9.0V P-P MAX 0 Volts 0 Volts OUTPUT OFFSET* 10% 2.5 µsec tr * *Offset measured at point A-A’ in Fig 5 * Rise and fall times measured at point A-A’ in Fig 5 FIGURE 3 – TRANSMITTER (TX) OUTPUT WAVEFORM FIGURE 4 – TRANSMITTER (TX) OUTPUT OFFSET 2200 +5V 0.1µF ZO 4, 9,10,30,31,45 TX DATA OUT 1 2 ACT4438 1 7.5KΩ 2 RX DATA IN RX DATA IN RISET 34 ZO 1800 1600 A 4 5 6 RTH HI TX DATA OUT RTH LO 2000 55Ω 1:2.5 16-19 ZO POWER DISSIPATION MILLIWATTS 6.8µF 21-24 3 7 8 48 A’ 55Ω Transformer Model: Use Pulse/Technitrol Part# 1553-45 or equivalent 47 GND 1400 1200 Maximum 1000 800 Typical 600 400 200 8, 32, 36, 46, 51 0 2.7KΩ Resistors 7.5KΩ/ 2.7KΩ ±1%, 1/8 W 10 20 30 40 50 60 70 80 90 100 DUTY CYCLE – PERCENT Note: Vcc = 5 Volts, Vbus (pt A-A') at 7.5 Volts P-P, ZO = 78Ω FIGURE 6 – POWER DISSIPATION VS. DUTY CYCLE FIGURE 5 – TYPICAL TRANSFORMER CONNECTION DIRECT STUB SCD4438 Rev J 12/20/06 5 Aeroflex Plainview PACKAGE PIN OUT DESCRIPTION - ACT4438 Pin # Function Pin # Function Pin # Function Pin # Function Pin # Function TX DATA OUT 34 RISET 45 VCC 35 NC 46 GND 1 RTH HI 12 NC 23 2 RTH LO 13 NC 24 * TX DATA OUT * 3 NC 14 NC 25 NC 36 GND 47 RX DATA IN 4 VCC 15 NC 26 NC 37 RX DATA OUT 48 RX DATA IN 5 TX DATA IN 16 TX DATA OUT 27 NC 38 RX STROBE 49 NC 6 TX DATA IN 17 28 NC 39 RX DATA OUT 50 NC 7 TX INHIBIT IN 18 29 NC 40 NC 51 GND 8 GND 19 * TX DATA OUT * TX DATA OUT * TX DATA OUT * 30 VCC 41 NC 52 NC 9 VCC 20 NC 31 42 NC 10 * VCC * * VCC * 21 TX DATA OUT 32 GND 43 NC 11 NC 22 * TX DATA OUT * 33 NC 44 NC * High current lines PACKAGE DESCRIPTION PIN 1 IDENTIFER & ESD INDICATOR 4438 Integral Heat Sink TOP PAD LEAD FRAME VIEW SCD4438 Rev J 12/20/06 NOTE 1. Dimensions in millimeters 6 Aeroflex Plainview CONFIGURATIONS AND ORDERING INFORMATION Model No. Screening Level Receiver and Transmitter Data Levels (See Figure 1) Case ACT4438-3 Industrial Temperature -40°C to +85°C Normally Low Epad, 52 lead, 8 x 8 mm, QFN THE FOLLOWING ARE SOME GUIDELINES FOR THE BOARD LAYOUT OF THE ACT4438 The ACT4438 is a fairly high current device with power supply input currents about 600ma and transmitter output currents in the 500ma region. Therefore, referring to Figure 5 of the data sheet; 1. The 5V power input lands, pins 9, 10, 30 and 31, should be as wide as possible if they are significantly far away from the power source. If you have to via up from below use multiple vias to minimize via interconnect resistance. The land resistance should be made as small as possible so that there will not be a signifcant voltage drop. 2. The transmitter output, pins 16-19 and 21-24 that go to the transformer primary, should run directly to the transformer, do not use vias to connect. They also should be symmetrical and be as wide as possible to minimize trace resistance. The center-tap of the primary transformer will also carry the transmitter output currents and should run directly to a ground plane using multiple vias to minimize the via interconnect resistance. 3. The transmitter output voltage level is set by the 2.7K resistor connected to pin 34. This is a very sensitive node. Therefore keep this node as short as possible and do not allow any other signal trace to cross under it. 4. In general keep output lines away from input lines such as the receiver output lines pins 47 and 48, which have high level (0V to 4V) fast switching edges. 5. The Receiver threshold level set by the 7.5K resistor connected to pins 1 and 2 are also sensitive nodes and should also be kept as short as possible without allowing any other signal trace to cross under them. 6. This package has a heatsink on the bottom side which is on the same plane as the package pins. This heatsink should also be soldered reflowed to a pad, the same size as the heatsink, which contains multiple vias connecting the heatsink pad to a ground plane layer. This will remove heat from the die and fan it out across the ground plane. PLAINVIEW, NEW YORK Toll Free: 800-THE-1553 Fax: 516-694-6715 INTERNATIONAL Tel: 805-778-9229 Fax: 805-778-1980 NORTHEAST Tel: 603-888-3975 Fax: 603-888-4585 SE AND MID-ATLANTIC Tel: 321-951-4164 Fax: 321-951-4254 WEST COAST Tel: 949-362-2260 Fax: 949-362-2266 CENTRAL Tel: 719-594-8017 Fax: 719-594-8468 www.aeroflex.com [email protected] Aeroflex Microelectronic Solutions reserves the right to change at any time without notice the specifications, design, function, or form of its products described herein. All parameters must be validated for each customer's application by engineering. No liability is assumed as a result of use of this product. No patent licenses are implied. Our passion for performance is defined by three attributes represented by these three icons: solution-minded, performance-driven and customer-focused SCD4438 Rev J 12/20/06 7