Standard Products Advanced RadHard-by-Design RHD5940 14-Bit Analog to Digital Converter www.aeroflex.com/RHDseries January 10, 2012 FEATURES ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ Single power supply operation 3.3V to 5.0V Radiation performance - Total dose: >1Mrad(Si); Dose rate = 50 - 300 rads(Si)/s - ELDRS Immune - SEL Immune >100 MeV-cm2/mg - Neutron Displacement Damage >1012 neutrons/cm2 14-Bit Digital Output Successive Approximation A-to-D Tri-State digital outputs Power Down (Sleep) mode Single or continuous conversion 20 clock conversion period Digital output available until the completion of the next conversion Busy (Prime) and End-of-Conversion status outputs 2000V Input/Output ESD protection Full military temperature range Designed for aerospace and high reliability space applications Packaging – Hermetic ceramic - 24-pin, 0.614"L x 0.299"W x 0.120"Ht SOIC - Typical Weight 2 grams Aeroflex Plainview’s Radiation Hardness Assurance Plan is DLA Certified to MIL-PRF-38534, Appendix G. GENERAL DESCRIPTION Aeroflex’s RHD5940 is a radiation hardened, single supply, 14-Bit Analog-to-Digital converter in a 24-pin SOIC package. The RHD5940 design uses specific circuit topology and layout methods to mitigate total ionizing dose effects and single event latchup. These characteristics make the RHD5940 especially suited for the harsh environment encountered in Deep Space missions. It is guaranteed operational from -55°C to +125°C. Available screened in accordance with MIL-PRF-38534 Class K, the RHD5940 is ideal for demanding military and space applications. ORGANIZATION AND APPLICATION The RHD5940 takes an analog signal and performs a 14-bit successive approximation analog-to-digital conversion in a nominal period of 20uS. The 14-Bit digital output has a tri-state control allowing the connection of multiple RHD5940s. This provides the ability to interface many voltage readings to the digital processor data bus. The full-scale range is determined by reference input voltages which will typically include any ~ 4 volt span anywhere in the power supply range (nominal 5V supply). The input impedance of the reference/span terminals is a constant 4K ohms. Gain compression will occur near either power supply extremes but can be avoided if the references are more than 200mV away from the respective supply terminals. The input span can be less than 4 volts at the expense of ultimate resolution SCD5940 Rev A The analog input impedance is primary capacitance (20pF). The input voltage charges a track-and-hold hold capacitor through transmission gates. The input bandwidth is determined by the slew rate of the hold amplifier and is adequate to allow input sampling in three clock periods (3uS nominal). The ultimate bandwidth is determined by the aperture uncertainty associated with the closing of the sample gate (approximately 5nS). The converter bandwidth is then determined by the sampling Nyquist frequency rather than the input signal; change rate (dv/dt) and the LSB weight in volts as would be the case if there were no sample and hold. Start-Convert (STCNV_H), Busy (BUSY_L) and End-Of-Convert (EOC_H) status and control line are provided. The converter will operate in either continuous or single conversion modes. The digital output register changes at the end of a conversion and is available until the next End-Of-Convert. Digital input and output circuits operate from a voltage independent of the remainder of the chip such that I/O is compatible with digital systems from less than 3.3 to 5 volts. The converter divides the reference voltage into 16 segments with a linear weighted resistor network. The voltage on any segment is passed to a linear 10-bit DAC for interpolation. The architecture is inherently capable of monotonic operation. INL is ±10 LSBs. DNL is ±1/2 LSB. The sampled input voltage is compared to the output of the two stage DAC for a 14-bit successive approximation conversion. All inputs are protected to both power supply rails by semiconductor diodes. Inputs should be constrained to Vcc +0.4 and Vee-0.4 to avoid forward biasing protection paths. The devices will not latch with SEU events to above 100 MeV-cm2/mg. Total dose degradation is minimal to above 1Mrad(Si). Displacement damage environments to neutron fluence equivalents in the mid 1012 neutrons per cm2 range are readily tolerated. There is no sensitivity to low-dose rate (ELDRS) effects. SEU effects are application dependant. FIGURE 1: BLOCK DIAGRAM SCD5940 Rev A Advanced 1/10/12 2 Aeroflex Plainview ABSOLUTE MAXIMUM RATINGS Parameter Range Units Case Operating Temperature Range -55 to +125 °C Storage Temperature Range -65 to +150 °C Junction Temperature +150 °C Supply Voltage VCC - VEE +6.0 V VCC +0.4 VEE -0.4 V 300 °C Thermal Resistance, Junction to Case,jc 3.5 °C/W ESD Rating 2.0 KV TBD mW Input Voltage Lead Temperature (soldering, 10 seconds) Power @25°C NOTICE: Stresses above those listed under “Absolute Maximums Rating” may cause permanent damage to the device. These are stress rating only; functional operation beyond the “Operation Conditions” is not recommended and extended exposure beyond the “Operation Conditions” may affect device reliability. RECOMMENDED OPERATING CONDITIONS Symbol +VCC Parameter Power Supply Voltage Typical Units 5.0 V ELECTRICAL PERFORMANCE CHARACTERISTICS (TC = -55°C TO +125°C, +VCC = +5.0V -- UNLESS OTHERWISE SPECIFIED) Parameter Symbol Conditions Min Typ Max Units Supply Current Sleep ICCS TBD mA Supply Current Static ICCQ TBD mA Supply Current Dynamic ICCD TBD mA VCC V High Analog Reference Voltage PREF Low Analog Reference Voltage NREF 1 4 V VEE Full-scale Input Range Operating Range 0 PREF NREF V -0.1 PREF NREF +0.1 V Input Capacitance 40 pF Effective Number of Bits EOB 14 BITS Integral Non Linearity INL 0.5 LSB Differential Non Linearity DNL 0.5 LSB DC Offset TBD DC Gain 1 Reference Input Current SCD5940 Rev A Advanced 1/10/12 V TBD Input Range 3 V 4 5 V TBD mA Aeroflex Plainview ELECTRICAL PERFORMANCE CHARACTERISTICS (continued) (TC = -55°C TO +125°C, +VCC = +5.0V -- UNLESS OTHERWISE SPECIFIED) Parameter Symbol Conditions Min Typ Max Units fSAMPLE(MAX) 25 KSPS Conversion Time tCONV 16 Clk Cycles Acquisition Time tACQ 4 Clk Cycles Signal to Noise Ratio SNR TBD dB Maximum Sampling Rate FIGURE 2: BASIC TIMING DIAGRAM SCD5940 Rev A Advanced 1/10/12 4 Aeroflex Plainview Pin # Signal Definition 1 AIN Analog Input 2 NREF Low Analog Reference Voltage 3 VCC Supply Voltage 4 STCNV_H Start Conversion 5 OE_H Output Enable 6 CLK Clock Input 7 B00 Digital Output 00 8 B01 Digital Output 01 9 B02 Digital Output 02 10 B03 Digital Output 03 11 B04 Digital Output 04 12 B05 Digital Output 05 13 B06 Digital Output 06 14 B07 Digital Output 07 15 B08 Digital Output 08 16 B09 Digital Output 09 17 B10 Digital Output 10 18 B11 Digital Output 11 19 B12 Digital Output 12 20 B13 Digital Output 13 21 EOC_H End of Convert 22 BUSY_L Busy 23 VEE Supply Return 24 PREF High Analog Reference Voltage FIGURE 3: PACKAGE PIN-OUT AND SIGNAL DEFINITION SCD5940 Rev A Advanced 1/10/12 5 Aeroflex Plainview ORDERING INFORMATION Model DLA SMD # Screening RHD5940-7 - Commercial Flow, +25°C testing only RHD5940-S - Military Temperature, -55°C to +125°C Screened in accordance with the individual Test Methods of MIL-STD-883 for Space Applications RHD5940-201-1S Pending RHD5940-201-2S Pending RHD5940-901-1S Pending RHD5940-901-2S Pending Package DLA SMD Pending 24-pin SOIC Package DLA SMD and Radiation Certification Pending Note: Package and lid are electrically isolated from signal pads. FIGURE 4: PACKAGE OUTLINE EXPORT CONTROL: EXPORT WARNING: This product is controlled for export under the International Traffic in Arms Regulations (ITAR). A license from the U.S. Department of State is required prior to the export of this product from the United States. Aeroflex’s military and space products are controlled for export under the International Traffic in Arms Regulations (ITAR) and may not be sold or proposed or offered for sale to certain countries. (See ITAR 126.1 for complete information.) 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. SCD5940 Rev A Advanced 1/10/12 Our passion for performance is defined by three attributes represented by these three icons: solution-minded, performance-driven and customer-focused 6