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 TX DATA OUT TX DATA IN DRIVER TX DATA IN TRANSMIT ACTIVE FILTER OUTPUT STAGE TX DATA OUT V+ TX INHIBIT VCC COMP. +5 V RX DATA OUT VEE V- RX DATA IN RX DATA IN INPUT AMP RECEIVE ACTIVE FILTER COMP. RX DATA OUT STROBE 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 ABSOLUTE MAXIMUM RATINGS Operating Case Temperature -55°C to +125°C Storage Case Temperature -65°C to +150°C Power Supply Voltages (V CC, VEE, VL) ±12VDC to ±18VDC Logic Input Voltage +5VDC to +7VDC -0.3 VDC to +5.5 VDC Receiver Differential Input ±40 VP-P Receiver Input Voltage (Common Mode) ±10 V Driver Peak Output Current 150 mA Total Package Power Dissipation over the Full Operating Case Temperature Range 3.25 Watts (Note: Normal operation conditions require one transmitter on and the other off at any given time) Maximum Junction to Case Temperature 16.25°C Thermal resistance – Junction to Case 5°C/W ELECTRICAL CHARACTERISTICS – DRIVER SECTION 1/ 2/ INPUT CHARACTERISTICS, TX DATA IN or TX DATA IN Parameter Condition Symbol Min Typ Max Unit "0" Input Current VIN = 0.4V IILD - -0.1 -0.2 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 "0" Input Current VIN = 0.4V IILI - -0.1 -0.2 mA "1" Input Current VIN = 2.7 V 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 - 350 700 nS Delay from TX inhibit, (1➝0) to active output - tDXON - 300 500 nS Differential Output Noise, inhibit mode 3/ VNOI - 0.8 10 mVp-p Differential Output Impedance * 4/ ZOI 2K - - Ω Point B- B' ZO = 70Ω VO 26 18 29 21 32 25 Vp-p Vp-p 5/ VOS VOS - ±360 ±250 mVpk mVpk 10% - 90% tR & tF 200 250 300 nS − tDTX - 240 300 nS INHIBIT CHARACTERISTICS * See Aeroflex Application note# 113 for reference. OUTPUT CHARACTERISTICS Differential output - Direct coupled stub Differential output - Transformer coupled stub (See Figures 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 Figure 5) Delay from 50% Point of TX DATA or TX DATA input to zero crossing of differential output. SCD4808N Rev B 3 ELECTRICAL CHARACTERISTICS – RECEIVER SECTION Parameter Condition Symbol Min Typ Max Unit f = 1MHz ZIN 10K - - Ω Differential Input Voltage Range - VIDR - - 40 Vp-p Input Common Mode Voltage Range - VICR 10 - - Vp-p Common Mode Rejection Ratio - CMRR 40 - - dB Differential Input Impedance STROBE CHARACTERISTICS (LOGIC "0" INHIBITS OUTPUT) "0" Input Current VS = 0.4 V IIL - -0.2 -0.4 mA "1" Input Current VS = 2.7 V IIH - 1.0 +40 µA "0" Input Voltage - VIL - - 0.7 V "1" Input Voltage - VIH 2.0 - - V Strobe Delay (Turn-on or Turn-off) - tSD - 40 150 nS VTH 0.60 0.80 1.10 Vp-p THRESHOLD CHARACTERISTICS (SINEWAVE INPUT ) Internal Threshold Voltage Figure 4 Point B-B’ 1MHz OUTPUT CHARACTERISTICS, RX DATA AND RX DATA "1" State IOH = -0.4 mA VOH 2.5 3.6 - V "0" State IOL = 4 mA VOL - 0.35 0.5 V Receiver Output Skew 6/ tRXSK - - 10 nS Delay (average), from differential input zero crossings to RX DATA and RX DATA output 50% points 7/ tDRX - 300 450 nS POWER SUPPLY CURRENTS PER CHANNEL 1/ 2/ VCC = +12V to +15V, VEE = -12V to -15V, VL = +5V Duty Cycle Condition Symbol Typ Max Unit ICC IEE IL 5 25 18 10 35 30 mA ICC IEE IL 20 40 18 30 60 30 50% ICC IEE IL 40 60 18 60 80 30 100% ICC IEE IL 85 105 18 120 140 30 Transmitter Standby 25% Pt. B -B' ZO = 70 Ω, VO = 29 VPK-PK Bit Pattern = FFFFHEX Figure 4 SCD4808N Rev B 4 TYPICAL HYBRID POWER DISSIPATION *, PER CHANNEL Power Supply Conditions PSC1 VCC = +15V VEE = -15V VL = +5V PSC2 VCC = +15V VEE = -12V VL = +5V Condition Standby 100% Duty Cycle Unit Point B-B' ZO = 70 Ω, VO = 29 VPK-PK Bit Pattern = FFFFHEX Figure 4 0.540 2.167 Watts 0.465 1.852 0.450 1.600 PSC3 VCC = +12V VEE = -12V VL = +5V * See Aeroflex Application note# 112 for reference. RECOMMENDED POWER SUPPLY VOLTAGE RANGE +V +11.4 Volts to +15.75 Volts -V -11.4 Volts to -15.75 Volts Logic +4.5 Volts to +5.5 Volts Notes: 1. V CC = +15Volts ±0.75V, VEE = -15Volts ±0.75V, VIL = +5Volts ±0.5V, TC = -55°C to +125°C, unless otherwise specified. 2. All typical values are measured at +25°C. 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 µS after midpoint crossing of the parity bit of the last word of a 660 µS 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 Point B-B' of Figure 4 or 2.1 Vpk-pk at 1MHz driven into Point B-B' of Figure 3. The specification maximum is guaranteed for TA = 25°C 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. SCD4808N Rev B 5 Terminal TRANSCEIVER UNDER TEST Zo TX DATA OUT RX DATA IN Isolation Transformer Coupling Transformer 1:N 1 : 1.414 R B A RX DATA OUT Data Bus Wire Pair Isolation Resistors R = 0.75 ZO RX DATA OUT R B' A' TX DATA OUT RX DATA IN Zo Terminal Input Impedance B – B' MIL-STD-1553B para 4.5.2.1.2.3 1KΩ minimum. 75KHz – 1MHz Transformer turns ratio: N = 0.707 Recommend Technitrol 1553-1 FIGURE 3 – DATABUS INTERFACE USING TRANSFORMER COUPLING (FIGURE 9, MIL-STD-1553B) Terminal TRANSCEIVER UNDER TEST TX DATA OUT RX DATA IN Zo Isolation Transformer 55Ω 1:N B A Data Bus Wire Pair RX DATA OUT RX DATA OUT 55Ω B' A' TX DATA OUT RX DATA IN 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 2KΩ minimum. 75KHz – 1MHz FIGURE 4 – DATABUS INTERFACE USING DIRECT COUPLING (FIGURE 10, MIL-STD-1553B) SCD4808N Rev B 6 tf* 90% 6.5V P-P MIN 8.0V P-P MAX 0 Volts 10% tr* * Rise and fall times measured at Point A-A’ in Figure 3 or 4 FIGURE 5 – TRANSMITTER (TX) OUTPUT WAVE FORM LAST BIT Magnified View OUTPUT OFFSET * OUTPUT OFFSET * 0 Volts 2.5 µsec *Offset measured at Point A-A’ in Figure 3 or 4 FIGURE 6 – TRANSMITTER (TX) OUTPUT OFFSET 4.0 3.6 POWER DISSIPATION WATTS 3.2 2.8 2.4 2.0 PSC 1 PSC 2 1.6 PSC 3 1.2 0.8 0.4 0 0 10 20 30 40 50 60 70 80 90 100 DUTY CYCLE, PERCENT FIGURE 7 – TYPICAL HYBRID POWER DISSIPATION vs. DUTY CYCLE (PER CHANNEL) SCD4808N Rev B 7 PACKAGE PINS & FUNCTIONS PACKAGE CONFIGURATION OUTLINE Pin # PLUG-IN PACKAGE 1.90 MAX 0.085 1.70 .097 19 36 0.78 MAX 0.600 18 Pin 1 & ESD Designator 0.24 MIN 0.018 DIA. ±0.002 FLAT PACKAGE 0.78 MAX 19 18 0.015 ±0.002 1.90 MAX 0.10 Typ 36 0.097 0.086 R 4 Places 0.175 MAX Pin 1 & ESD Designator 0.010 ±0.002 0.40 MIN 2 SIDES 0.065 REF Notes 1. Dimensions shown are in inches 2. Pins are equally spaced at 0.100±0.002 tolerance, non-cumulative, each row SCD4808N Rev B 8 Function Channel 1 TX DATA OUT A 2 TX DATA OUT A 3 GROUND A 4 NC 5 RX DATA OUT A 6 STROBE A 7 GROUND A 8 RX DATA OUT A 9 CASE 10 TX DATA OUT B 11 TX DATA OUT B 12 GROUND B 13 NC 14 RX DATA OUT B 15 STROBE B 16 GROUND B 17 RX DATA OUT B 18 NC 19 VCC B 20 RX DATA IN B 21 RX DATA IN B 22 GROUND B 23 VEE B 24 +5V B 25 INHIBIT B 26 TX DATA IN B 27 TX DATA IN B 28 VCC A 29 RX DATA IN A 30 RX DATA IN A 31 GROUND A 32 VEE A 33 +5 V A 34 INHIBIT A 35 TX DATA IN A 36 TX DATA IN A CONFIGURATIONS AND ORDERING INFORMATION Model No. ACT4808N-D Receiver Data level DESC SMD Normally Low Pending Case Plug-In Package ACT4808N-DF Configuration Dual Flat Package ACT4808N-DI Normally High Plug-In Package ACT4808N-DFI Flat Package 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 SCD4808N Rev B 9