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| 7846A 16-Bit Digital to Analog Converter VCC 21 VREF+ 7 R VDD 4 R A2 + R A3 + 6 RIN R 16 Segment Switch Matrix A1 + 4 5 VOUT 12-bit DAC 12 23 CS R/W R 7846A VREF- 8 DAC Latch 12 Control Logic 22 25 LDAC 24 CLR I/O Latch 9 VSS 10 DB15 3 DB0 20 DGND Memory Logic Diagram FEATURES: * RAD-PAK(R) technology-hardened against natural space radiation * Total dose hardness: - > 100 krad (Si), depending upon space mission * Excellent Single Event Effects - SELTH > 114 MeV/mg/cm2 - SEU < 8 MeV/mg/cm2 * Package: -28 pin RAD-PAK(R) 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) DESCRIPTION: Maxwell Technologies' 7846A 16-Bit DAC converter microcircuit features a greater than 100 krad (Si) total dose tolerance, depending upon space mission. The 7846A has VREF+ and VREF- reference inputs and an on-chip output amplifier which gives the option of unipolar or bipolar output. The 7846A 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 7846A 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(R) 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. 05.29.03 REV 5 All data sheets are subject to change without notice 1 (619) 503-3300 - Fax: (619) 503-3301- www.maxwell.com (c)2003 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter TABLE 1. 7846A PINOUT DESCRIPTION PIN 1-3 4 5 6 7 8 SYMBOL DB2-DB0 VDD VOUT RIN VREF+ VREFDESCRIPTION Data I/O pins. DB0 is LSB. Positive supply for analog circuitry. This is +15V nominal. DAC output voltage pin. Input to summing resistor of DAC output amplifier. This is used to select output voltage ranges. VREF+ Input. The DAC is specified for VREF+ = +5V. VREF- Input. For unipolar operation connect VREF- to 0V and for bipolar operation connect it to -5V. The device is specified for both conditions. Negative supply for the analog circuitry. This is -15V nominal. Data I/O pins. DB15 is MSB. Ground pin for digital circuitry. Positive supply for digital circuitry. This is +5V nominal. R/W Input. This can be used to load data to the DAC or to read back the DAC latch contents. Chip select input. This selects the device. Clear Input. The DAC can be cleared to 000...000 or 100...000. Asynchronous load input to DAC. Data I/O pins. 7846A 9 10-19 20 21 22 23 24 25 26-28 VSS DB15-DB6 DGND VCC R/W CS CLR LDAC DB5-DB3 Memory 05.29.03 REV 5 All data sheets are subject to change without notice 2 (c)2003 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter TABLE 2. 7846A ABSOLUTE MAXIMUM RATINGS 1 PARAMETER VDD to DGND VCC to DGND VSS to DGND VREF+ to DGND VREF- to DGND VOUT to DGND 2 RIN to DGND Digital Input Voltage to DGND Digital Output Voltage to DGND Power Dissipation To +75 C Derates above +75 C Thermal Inpedance Operating Temperature Range Storage Temperature Range MIN -0.3 -0.3 -17 -25 -25 -25 -25 -0.3 -0.3 MAX +17 VDD +0.3 or 7 (Whichever Is Lower) +0.3 +25 +25 +25 +25 VCC +0.3 VCC +0.3 1000 10 7846A UNIT V V V V V V V V V mW mW/ C C C C Memory JC -55 -65 2.78 +125 +150 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 IDD IEE ICC VARIATION 10% of value specified in Table 4. 10% of value specified in Table 4. 10% of value specified in Table 4. 05.29.03 REV 5 All data sheets are subject to change without notice 3 (c)2003 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter TABLE 4. 7846A ELECTRICAL SPECIFICATIONS 1 (VDD=+15V 5%; VSS=-15V 5%; VCC = +5 V 5%, TA = -55 TO +125C) PARAMETER 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 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 REFERENCE INPUT Input Resistance VREF+ Range VREF- Range OUTPUT CHARACTERISTICS Output Voltage Swing Resistive Load1 Capacitive Load3 Output Resistance Short Circuit Current 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 = 400 A DB0-DB15 = 0 to VCC 1, 2, 3 To 0V To 0V To 0V or Any Power Supply 1, 2, 3 VREF-=0V, VOUT=0V to +10V 1LSB=153 V Guaranteed Monotonic VOUT Load= 10M 1 2, 3 1 1 2,3 1 2,3 1 1 1 2, 3 1 1 2, 3 1 2, 3 1 2, 3 1 1 1 1, 2, 3 TEST CONDITIONS/COMMENTS SUBGROUPS TA=-55 C TO +125 C 16 16 16 1 12 24 12 24 2 2 6 8 1 6 16 6 16 6 16 2 2 2 20 40 VSS + 6 to VDD - 6 VSS + 6 to VDD - 6 VSS + 4 to VDD - 3 3 1000 0.3 25 2.4 0.8 10 10 0.4 4.0 10 10 7846A UNIT Bits LSB typ LSB max LSB max LSB typ LSB max LSB typ LSB max ppm FSR/C typ ppm FSR/C typ 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 K min K max V V V max k min pF max typ mA typ V min V max A max pF max V max V min A max pF max VREF-=-5V, VOUT=-10V to +10V 1LSB=305 V Guaranteed Monotonic VOUT Load=10M VOUT Load=10M Memory Resistance from VREF- to VREF+ Typically 30k 1, 2, 3 05.29.03 REV 5 All data sheets are subject to change without notice 4 (c)2003 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter TABLE 4. 7846A ELECTRICAL SPECIFICATIONS 1 (VDD=+15V 5%; VSS=-15V 5%; VCC = +5 V 5%, TA = -55 TO +125C) PARAMETER POWER REQUIREMENTS 4 VDD VSS VCC IDD ISS ICC Power Supply Sensitivity 5 Power Dissipation 1. Minimum load is 3k. 2. Sample tested to ensure compliance. 3. Maximum load is 1000pF. 4. 7846ARP is functional with power supplies of 12V. See typical performance curves. TEST CONDITIONS/COMMENTS SUBGROUPS TA=-55 C TO +125 C +11.4/+15.75 -11.4/-15.75 +4.75/+5.25 5 5 1 2 100 7846A UNIT 1, 2, 3 VOUT Unloaded VOUT Unloaded VOUT Unloaded V min/V max V min/V max V min/V max mA max mA max mA max LSB/V max mW typ Memory 5. Sensitivity to Gain Error, Offset Error and Bipolar Zero Error to VDD, VSS variations. 6. Guaranteed by design TABLE 5. 7846A AC PERFORMANCE CHARACTERISTICS1 (VDD=+15V 5%; VSS=-15V 5%; VCC = +5 V 5%, TA = -55 TO +125C) PARAMETER Output Settling Time Digital-to-Analog Glitch Impulse AC Feed through Digital Feed through Output Noise Voltage Density (1kHz-100kHz) 1. Guaranteed by design. TEST CONDITIONS To 0.006% FSR. VOUT loaded. VREF-=0V. To 0.003% FSR. VOUT loaded. VREF-=-5V. DAC alternately loaded with 10...0000 and 01...1111. VOUT unloaded. VREF-=0V, VREF+=1V rms, 10kHz sine wave. DAC loaded with all 0s. DAC alternately loaded with all 1s and all 0s. CS High. Measured at VOUT. DAC loaded with 0111011...11. VREF+=VREF-=0V. TA=25 C 7 9 400 0.5 10 50 TA=TMIN TO TMAX 7 9 400 0.5 10 50 UNIT s max s max nV-secs typ mV pk-pk typ nV-secs typ nV/(Hz)1/2 typ 05.29.03 REV 5 All data sheets are subject to change without notice 5 (c)2003 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter TABLE 6. 7846A TIMING CHARACTERISTICS1,2,3,4 7846A (VDD = +14.25V TO 15.75V; VSS = -14.25V TO -15.75V; VCC = 4.75 TO 5.25V; UNLESS OTHERWISE SPECIFIED) PARAMETER t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 t12 TEST CONDITIONS/COMMENTS R/W to CS Setup Time CS Pulse Width (Write Cycle) R/W to CS Hold Time Data Setup Time Data Hold Time Data Access Time Bus Relinquish Time CLR Setup Time CLR Pulse Width CLR Hold Time LDAC Pulse Width CS Pulse Width (Read Cycle) LIMIT AT TA=-55 C TO +125 C 50 190 50 120 0 320 10 90 20 150 0 100 330 UNIT ns min ns min ns min ns min ns min ns max ns min ns max ns min Memory ns min ns min ns min ns min 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. 05.29.03 REV 5 All data sheets are subject to change without notice 6 (c)2003 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter FIGURE 1. LOAD CIRCUITS FOR ACCESS TIME (t6) 7846A FIGURE 2. LOAD CIRCUITS FOR BUS RELINQUISH TIME (t7) Memory FIGURE 3. 16-BIT DIGITAL TO ANALOG CONVERTER t3 R./W t1 t3 t1 5V 0V CS t2 t5 t4 t6 t12 t7 5V 0V 5V DATA Data Valid CLR Data Valid 0V 5V t8 t9 t10 t8 t9 t10 t11 0V 5V 0V LDAC 05.29.03 REV 5 All data sheets are subject to change without notice 7 (c)2003 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter 7846A Memory 05.29.03 REV 5 All data sheets are subject to change without notice 8 (c)2003 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter 7846A Memory 28 PIN RAD-PAK(R) FLAT PACKAGE SYMBOL MIN A b c D E E1 E2 E3 e L Q S1 N 0.360 0.062 0.000 0.190 0.015 0.004 -0.380 -0.180 0.030 DIMENSION NOM 0.207 0.017 0.005 0.720 0.410 -0.250 0.080 0.050 BSC 0.370 0.073 0.027 28 0.380 0.081 -MAX 0.224 0.022 0.009 0.740 0.420 0.440 --- F28-02 Note: All dimensions in inches 05.29.03 REV 5 All data sheets are subject to change without notice 9 (c)2003 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter Important Notice: 7846A 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 05.29.03 REV 5 All data sheets are subject to change without notice 10 (c)2003 Maxwell Technologies All rights reserved. 16-Bit Digital to Analog Converter Product Ordering Options Model Number 7846A RP F X Feature 7846A Option Details Screening Flow Monolithic S = Maxwell Class S B = Maxwell Class B I = Industrial (testing @ -55C, +25C, +125C) E = Engineering (testing @ +25C) Memory Package F = Flat Pack Radiation Feature RP = RAD-PAK(R) package Base Product Nomenclature 16-Bit Digital to Analog Converter 05.29.03 REV 5 All data sheets are subject to change without notice 11 (c)2003 Maxwell Technologies All rights reserved. |
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