7846B 16-Bit Digital to Analog Converter VREF+ 4 R R A2 + 16 Segment Switch Matrix 6 RIN 5 VOUT 23 CS 22 R/W R A3 + 12-bit DAC A1 + R VREF- VDD 21 7 R 7846B VCC 8 12 DAC Latch 4 Control Logic 12 I/O Latch 25 LDAC 24 10 3 20 DB15 DB0 DGND Memory 9 VSS CLR Logic Diagram FEATURES: DESCRIPTION: • RAD-PAK® technology-hardened against natural space radiation • Package: -28 pin RAD-PAK® Flat Pack • Microprocessor compatible with readback capability • 16-Bit monotonicity over temperature • ±2 LSBs integral linearity error • Unipolar or bipolar output • Multiplying capability • Low power (100 mW typical) Maxwell Technologies’ 7846B 16-Bit DAC converter microcircuit features a greater than 100 krad (Si) total dose tolerance, depending upon space mission. The 7846B has VREF+ and VREF- reference inputs and an on-chip output amplifier which gives the option of unipolar or bipolar output. The 7846B uses a segmented architecture. The 4 MSBs in the DAC latch select one of the segments in a 16-resistor string. Both taps of the segment are buffered by amplifiers and fed to a 12-bit DAC, which provides a further 12 bits of resolution. This architecture ensures 16-bit monotonicity. Excellent integral linearity results from tight matching between the input offset voltages of the two buffer amplifiers. In addition to the excellent accuracy specifications, the 7846B also offers a comprehensive microprocessor interface. There are 16 data I/O pins, plus control lines (CS, R/W, LDAC and CLR). R/W and CS have readback function which allows writing to and reading from the I/O latch. Maxwell Technologies' patented RAD-PAK® packaging technology incorporates radiation shielding in the microcircuit package. It eliminates the need for box shielding while providing the required radiation shielding for a lifetime in orbit or space mission. In a GEO orbit, RAD-PAK provides greater than 100 krad (Si) radiation dose tolerance. This product is available with screening up to Class S. 02.27.08 REV 1 (619) 503-3300 - Fax: (619) 503-3301- www.maxwell.com All data sheets are subject to change without notice 1 ©2008 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter 7846B TABLE 1. 7846B PINOUT DESCRIPTION SYMBOL DESCRIPTION 1-3 DB2-DB0 Data I/O pins. DB0 is LSB. 4 VDD Positive supply for analog circuitry. This is +15V nominal. 5 VOUT DAC output voltage pin. 6 RIN Input to summing resistor of DAC output amplifier. This is used to select output voltage ranges. 7 VREF+ VREF+ Input. The DAC is specified for VREF+ = +5V. 8 VREF- VREF- Input. For unipolar operation connect VREF- to 0V and for bipolar operation connect it to -5V. The device is specified for both conditions. 9 VSS Negative supply for the analog circuitry. This is -15V nominal. 10-19 DB15-DB6 Data I/O pins. DB15 is MSB. 20 DGND Ground pin for digital circuitry. 21 VCC Positive supply for digital circuitry. This is +5V nominal. 22 R/W R/W Input. This can be used to load data to the DAC or to read back the DAC latch contents. 23 CS Chip select input. This selects the device. 24 CLR Clear Input. The DAC can be cleared to 000...000 or 100...000. 25 LDAC Asynchronous load input to DAC. 26-28 DB5-DB3 Data I/O pins. 02.27.08 REV 1 All data sheets are subject to change without notice Memory PIN 2 ©2008 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter 7846B TABLE 2. 7846B ABSOLUTE MAXIMUM RATINGS 1 MIN MAX UNIT VDD to DGND -0.3 +17 V VCC to DGND -0.3 VDD +0.3 or 7 (Whichever Is Lower) V VSS to DGND -17 +0.3 V VREF+ to DGND -25 +25 V VREF- to DGND -25 +25 V VOUT to DGND 2 -25 +25 V RIN to DGND -25 +25 V Digital Input Voltage to DGND -0.3 VCC +0.3 V Digital Output Voltage to DGND -0.3 VCC +0.3 V 1000 10 mW mW/° C Power Dissipation To +75 ° C Derates above +75 ° C Thermal Inpedance ΘJC 2.78 °C Operating Temperature Range -55 +125 °C Storage Temperature Range -65 +150 °C Memory PARAMETER 1. Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect device reliability. Only one absolute maximum rating may be applied at any one time. 2. VOUT may be shorted to DGND, VDD, VSS and VCC provided that the power dissipation of the package is not exceeded. TABLE 3. DELTA LIMITS PARAMETER VARIATION IDD ±10% of value specified in Table 4. IEE ±10% of value specified in Table 4. ICC ±10% of value specified in Table 4. 02.27.08 REV 1 All data sheets are subject to change without notice 3 ©2008 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter 7846B TABLE 4. 7846B ELECTRICAL SPECIFICATIONS 1 (VDD=+15V ±5%; VSS=-15V ±5%; VCC = +5 V ±5%, TA = -55 TO +125°C) PARAMETER TEST CONDITIONS/COMMENTS UNIT 16 Bits 1 2, 3 1 1 2,3 1 2,3 1 1 ±16 ±16 ±1 ±12 ±24 ±12 ±24 ±2 ±2 LSB typ LSB max LSB max LSB typ LSB max LSB typ LSB max ppm FSR/°C typ ppm FSR/°C typ 1 2, 3 1 1 2, 3 1 2, 3 1 2, 3 1 1 1 ±6 ±8 ±1 ±6 ±16 ±6 ±16 ±6 ±16 ±2 ±2 ±2 LSB typ LSB max LSB max LSB typ LSB max LSB typ LSB max LSB typ LSB max ppm FSR/° C typ ppm FSR/° C typ ppm FSR/° C typ 1, 2, 3 20 40 VSS + 6 to VDD - 6 VSS + 6 to VDD - 6 KΩ min KΩ max V V 1, 2, 3 VSS + 4 to VDD - 3 3 1000 0.3 ±25 V max kΩ min pF max Ω typ mA typ 1, 2, 3 2.4 0.8 ±10 10 V min V max µ A max pF max 1, 2, 3 0.4 4.0 ±10 10 V max V min µ A max pF max Resolution UNIPOLAR OUTPUT Relative Accuracy @ 25 ° C - TMIN to TMAX Differential Nonlinearity Error Gain Error @ 25 ° C - TMIN to TMAX Offset Error @ 25 ° C - TMIN to TMAX Gain TC 2 Offset TC 2 VREF-=0V, VOUT=0V to +10V 1LSB=153µ V BIPOLAR OUTPUT Relative Accuracy @ 25 ° C - TMIN to TMAX Differential Nonlinearity Error Gain Error @ 25 ° C - TMIN to TMAX Offset Error @ 25 ° C - TMIN to TMAX Bipolar Zero Error @ 25 ° C - TMIN to TMAX Gain TC 2 Offset TC 2 Bipolar Zero TC 2 VREF-=-5V, VOUT=-10V to +10V 1LSB=305µ V REFERENCE INPUT Input Resistance Guaranteed Monotonic VOUT Load= 10MΩ Guaranteed Monotonic VOUT Load=10MΩ VOUT Load=10MΩ Resistance from VREF- to VREF+ Typically 30kΩ VREF+ Range VREF- Range OUTPUT CHARACTERISTICS Output Voltage Swing Resistive Load1 Capacitive Load3 Output Resistance Short Circuit Current To 0V To 0V To 0V or Any Power Supply DIGITAL INPUTS VIH (Input High Voltage) VIL (Input Low Voltage) IIN (Input Current) CIN (Input Capacitance) 2 DIGITAL OUTPUTS VOL (Output Low Voltage) VOH (Output High Voltage) Floating State Leakage Current Floating State Output Capacitance 2 ISINK = 1.6mA ISOURCE = 400µ A DB0-DB15 = 0 to VCC 02.27.08 REV 1 All data sheets are subject to change without notice 4 ©2008 Maxwell Technologies All rights reserved. Memory TA=-55 ° C TO +125 °C SUBGROUPS 16-Bit Digital to Analog Converter 7846B TABLE 4. 7846B ELECTRICAL SPECIFICATIONS 1 (VDD=+15V ±5%; VSS=-15V ±5%; VCC = +5 V ±5%, TA = -55 TO +125°C) TEST CONDITIONS/COMMENTS PARAMETER POWER REQUIREMENTS 4 VDD VSS VCC IDD ISS ICC Power Supply Sensitivity 5 Power Dissipation SUBGROUPS 1, 2, 3 VOUT Unloaded VOUT Unloaded VOUT Unloaded TA=-55 ° C TO +125 °C UNIT +11.4/+15.75 -11.4/-15.75 +4.75/+5.25 5 5 1 2 100 V min/V max V min/V max V min/V max mA max mA max mA max LSB/V max mW typ 1. Minimum load is 3kΩ. 2. Sample tested to ensure compliance. 3. Maximum load is 1000pF. 4. 7846ARP is functional with power supplies of ±12V. See typical performance curves. Memory 5. Sensitivity to Gain Error, Offset Error and Bipolar Zero Error to VDD, VSS variations. 6. Guaranteed by design TABLE 5. 7846B AC PERFORMANCE CHARACTERISTICS1 (VDD=+15V ±5%; VSS=-15V ±5%; VCC = +5 V ±5%, TA = -55 TO +125°C) TA=25° C TA=TMIN TO TMAX UNIT To 0.006% FSR. VOUT loaded. VREF-=0V. 7 7 µ s max To 0.003% FSR. VOUT loaded. VREF-=-5V. 9 9 µ s max Digital-to-Analog Glitch Impulse DAC alternately loaded with 10…0000 and 01…1111. VOUT unloaded. 400 400 nV-secs typ AC Feed through VREF-=0V, VREF+=1V rms, 10kHz sine wave. DAC loaded with all 0s. 0.5 0.5 mV pk-pk typ Digital Feed through DAC alternately loaded with all 1s and all 0s. CS High. 10 10 nV-secs typ Output Noise Voltage Density (1kHz-100kHz) Measured at VOUT. DAC loaded with 0111011…11. VREF+=VREF-=0V. 50 50 nV/(Hz)½ typ PARAMETER TEST CONDITIONS Output Settling Time 1. Guaranteed by design. 02.27.08 REV 1 All data sheets are subject to change without notice 5 ©2008 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter 7846B TABLE 6. 7846B TIMING CHARACTERISTICS1,2,3,4 (VDD = +14.25V TO 15.75V; VSS = -14.25V TO -15.75V; VCC = 4.75 TO 5.25V; UNLESS OTHERWISE SPECIFIED) LIMIT AT TA=-55 ° C TO +125 ° C UNIT R/W to CS Setup Time 50 ns min t2 CS Pulse Width (Write Cycle) 190 ns min t3 R/W to CS Hold Time 50 ns min t4 Data Setup Time 120 ns min t5 Data Hold Time 0 ns min t6 Data Access Time 320 ns max t7 Bus Relinquish Time 10 ns min 90 ns max PARAMETER TEST CONDITIONS/COMMENTS t1 CLR Setup Time 20 ns min t9 CLR Pulse Width 150 ns min t10 CLR Hold Time 0 ns min t11 LDAC Pulse Width 100 ns min t12 CS Pulse Width (Read Cycle) 330 ns min Memory t8 1. Guaranteed by design. All input control signals are specified with tR = tF = 5ns (10% to 90% of +5V) and timed from a voltage level of 1.6V. 2. t6 is measured with the load circuits of Figure 1 and defined as the time required for an output to cross 0.8V or 2.4V. 3. t7 is defined as the time required for an output to change 0.5V when loaded with the circuits of Figure 2. Specifications subject to change without notice. 4. See Figure 3 on page 7. 02.27.08 REV 1 All data sheets are subject to change without notice 6 ©2008 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter 7846B FIGURE 1. LOAD CIRCUITS FOR ACCESS TIME (t6) FIGURE 2. LOAD CIRCUITS FOR BUS RELINQUISH TIME (t7) Memory FIGURE 3. 16-BIT DIGITAL TO ANALOG CONVERTER R./W t1 t3 t3 t1 5V 0V t12 t2 CS 5V 0V t7 t5 t4 t6 5V DATA Data Valid Data Valid CLR t8 t9 t10 t8 t9 0V t10 5V t11 LDAC 0V 5V 0V 02.27.08 REV 1 All data sheets are subject to change without notice 7 ©2008 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter 7846B Memory 02.27.08 REV 1 All data sheets are subject to change without notice 8 ©2008 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter 7846B Memory 28 PIN RAD-PAK® FLAT PACKAGE DIMENSION SYMBOL MIN NOM MAX A 0.190 0.207 0.224 b 0.015 0.017 0.022 c 0.004 0.005 0.009 D -- 0.720 0.740 E 0.380 0.410 0.420 E1 -- -- 0.440 E2 0.180 0.250 -- E3 0.030 0.080 -- e 0.050 BSC L 0.360 0.370 0.380 Q 0.062 0.073 0.081 S1 0.000 0.027 -- N 28 Note: All dimensions in inches 02.27.08 REV 1 All data sheets are subject to change without notice 9 ©2008 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter 7846B Important Notice: These data sheets are created using the chip manufacturers published specifications. Maxwell Technologies verifies functionality by testing key parameters either by 100% testing, sample testing or characterization. The specifications presented within these data sheets represent the latest and most accurate information available to date. However, these specifications are subject to change without notice and Maxwell Technologies assumes no responsibility for the use of this information. Maxwell Technologies’ products are not authorized for use as critical components in life support devices or systems without express written approval from Maxwell Technologies. Any claim against Maxwell Technologies must be made within 90 days from the date of shipment from Maxwell Technologies. Maxwell Technologies’ liability shall be limited to replacement of defective parts. Memory 02.27.08 REV 1 All data sheets are subject to change without notice 10 ©2008 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter 7846B Product Ordering Options Model Number 7846B RP F X Option Details Feature Monolithic S = Maxwell Class S B = Maxwell Class B I = Industrial (testing @ -55°C, +25°C, +125°C) E = Engineering (testing @ +25°C) Package F = Flat Pack Radiation Feature RP = RAD-PAK® package Base Product Nomenclature 16-Bit Digital to Analog Converter 02.27.08 REV 1 All data sheets are subject to change without notice Memory Screening Flow 11 ©2008 Maxwell Technologies All rights reserved.