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1 memory all data sheets are subject to change without notice (858) 503-3300 - fax: (858) 503-3301 - www.maxwell.com 12-bit a/d converter 7672 ?2001 maxwell technologies all rights reserved. 12.19.01 rev 11 1000565 f eatures : ? 12-bit high speed a/d converter ?r ad -p ak ? radiation-hardened against natural space radia- tion ? total dose hardness: - > 100 krad (si), depending upon space mission ? excellent single event effect - sel > 120 mev/mg/cm 2 - seu th > 5.8 mev/mg/cm 2 - seu sat = -1e-4 cm 2 /device ? package: - 24 pin r ad -p ak ? flat package - 24 pin r ad -p ak ? dip ? fast conversion times: - 7672-05: 5 s - 7672-10: 10 s ? low 110 mw typical power consumption - corrects all single-bit errors - detects all double and some triple-bit errors ? high-speed bicmos technology - choice of +5v and +10v input ranges - operates with +5v and -12v power supplies - fast 125 ns bus-access time d escription : maxwell technologies ? 7672 high-speed 12-bit analog-to- digital converter microcircuit features a greater than 100 krad (si) total dose tolerance, depending upon space mission. the 7672 uses an accurate high-speed dac and comparator to achieve conversion time as low as 5 s while dissipating only 110 mw of power. the 7672 is designed to be used with an external reference voltage. this allows the user to choose a reference whose performance suits the application or to drive multiple 7672s from a single system reference, since the refer- ence input is buffered and draws very little current. for digital signal processing applications where absolute accuracy and temperature coefficients may be unimportant, a low cost refer- ence can be used. for optimal pr ecision, a high accuracy ref- erence where an absolute 12-bit accuracy can be obtained over a wide temperature range may be used. analog input range is pin-selectable for 0 to +5v, 0 to +10v, or 5v, making the adc ideal for data acquisition and analog input/output cards. a high-speed digital interface (125 ns data access time) with three state data outputs is compatible with most micro- processors. maxwell technologies' patented r ad -p ak ? packaging technol- ogy incorporates radiation shie lding in the microcircuit pack- age. it eliminates the need for box shielding while providing the required radiation shielding fo r a lifetime in orbit or space mission. in a geo orbit, r ad -p ak provides greater than 100 krad (si) radiation dose toleranc e. this product is available with screening up to class s. 12-bit dac + - + - successive approximation register control logic clock oscillator 12-bit latch three-state output drivers 2 1 24 23 22 21 19 20 18 17 4 11 12 13 16 3 v ref ain1 ain2 v dd v ss busy cs rd clk out clk in d0 d3 dgnd d4 d11 agnd logic diagram
memory 2 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit a/d converter 7672 12.19.01 rev 11 1000565 t able 1. 7672 p inout d escription p in s ymbol d escription 1 ain1 analog input 2v ref voltage-reference input 3 agnd analog ground 4-11 d11-d4 three-state data outputs 12 dgnd digital ground 13-16 d3-d0 three-state data outputs 17 clkin clock input 18 clkout clock output 19 rd read input 20 cs chip select 21 busy busy 22 v ss negative supply, -12v 23 v dd positive supply, +5v 24 ain2 analog input t able 2. 7672 a bsolute m aximum r atings p arameter s ymbol m in m ax u nits positive supply voltage to dgnd v dd -0.3 7.0 v negative supply voltage to dgnd v ss -17 +0.3c v agnd to dgnd -- -0.3 v dd +0.3 v ain1, ain2 to agnd -- -15 +15 v digital input voltage to dgnd v in -0.3 v dd +0.3 v digital output voltage to dgnd v out -0.3 v dd +0.3 v v ref to agnd -- v ss -0.3 v dd +0.3 v power dissipation to +75c p d -- 1000 mw power dissipation above 75 c (derate) -- -- 10 mw/c thermal impedance jc -- 3.24 c/w storage temperature range t stg -65 +150 c operating temperature range t a -55 +125 c
memory 3 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit a/d converter 7672 12.19.01 rev 11 1000565 t able 3. 7672 r ecommended o perating c onditions p arameter s ymbol m in m ax u nits positive supply voltage v dd 4.75 5.25 v negative supply voltage v ss -13.2 -10.8 v v ref input range v ref -5.05 -4.95 v power dissipation v dd = 5v, v ss = -12v p d -- 179 mw t able 4. 7672 dc e lectrical c haracteristics (v dd = 5v 5%, v ss = -12v 10%, v ref = -5v, t a = -55 to 125 c unless otherwise specified ) p arameter s ymbol t est c ondition m in m ax u nits input low voltage v il -- 0.8 v input high voltage v ih 2.4 -- v output low voltage v ol i sink = 1.6 ma -- 0.4 v output high voltage v oh i source = -200 a 4.0 -- v input leakage current i in (cs ,rd ) v in = v dd or gnd (clkin) v in = v dd or gnd -- -- 10 20 a output leakage current i lkg (d0-d11) v out = v dd or gnd -- 10 a input capacitance 1 c in -- 10 pf floating state output capacitance 2 c out -- 15 pf power supply current i dd i ss -- -- 7 -12 ma power supply rejection, v dd psrr (v dd )v dd = 4.75 to 5.25 volts v ss = -12v -- 1 lsb power supply rejection, v ss psrr (v ss )v ss = -10.8 to -13.2 volts v dd = 5v -- 1 lsb analog input current (ain1 or ain2) i ain unipolar range: 0 to 5 v, 10v bipolar range: 5v -- -- 3.5 1.75 ma v ref input range 1 v ref -5.05 -4.95 v v ref input current i ref -- 3 a resolution res t a = -55 to +125c 12 -- bits integral nonlinearity inl t a = +25 c t a = -55 to +125c -- -- 1 1 lsb differential nonlinearity d nl 12 bits, no missing codes t a = -55 to +125 c -- 0.9 lsb unipolar offset error uoe t a = +25 c t a = -55 to +125 c -- -- 5 6 lsb unipolar gain error uge t a = +25 c t a = -55 to +125 c -- -- 5 7 lsb
memory 4 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit a/d converter 7672 12.19.01 rev 11 1000565 bipolar zero error bze t a = +25 c t a = -55 to +125 c -- -- 5 6 lsb bipolar gain error bge t a = +25 c t a = -55 to +125 c -- -- 5 7 lsb 1. guaranteed by design. t able 5. 7672 t iming c haracteristics 1,2 (v dd = 5v 5%, v ss = -12v 10%, v ref = -5v, t a = -55 to 125 c unless otherwise specified ) 1. 1lsb = fs/4096; t a = 25 c; performance over power supply tolerance is guaranteed by power supply rejection test. 2. all inputs are 0v to +5v swing with t r = t r = 5ns (10 to 90% of +5v) and timed from a voltage level of +1.6v. p arameter t est c ondition s ymbol m in m ax u nits conversion time, synchronous clk, 3 3. functionally tested. 12.5 clks, t a = -55 to +125 c t conv -- 5.0 us -- 10 conversion time, asynchronous clk, 12-13 clks, t a = -55 to +125 c t conv 4.8 5.2 us 9.6 10.4 cs to rd setup time t a = -55 to +125 c t 1 0--ns rd to busy delay c l = 50 pf, t a = +25 c c l = 50 pf, t a = -55 to +125 c t 2 -- -- 190 270 ns data access time 4 4. t 3 and t 6 are measured with the load circuits of figure 1 and are defined as the time r equired for an output to cross +0.8 or +2.4. c l = 100 pf, t a = +25 c c l = 100 pf, t a = -55 to +125 c t 3 -- -- 125 170 ns rd pulse width t a = -55 to +125 c t 4 t 3 -- ns cs to rd hold time t a = -55 to +125 c t 5 0--ns data setup time after busy 4 c l = 100 pf, t a = +25 c c l = 100 pf, t a = -55 to +125 c t 6 -- -- -- 70 100 ns bus relinguish time 5 5. t 7 is defined as the time required for the data lines to change 0.5v when loaded with the circuit of figure 2. (t a = +25 c) (-55 < t a < +125 c) t 7 -- -- 75 90 ns delay between read operations (-55 < t a < +125 c) t 8 200 -- ns t able 4. 7672 dc e lectrical c haracteristics (v dd = 5v 5%, v ss = -12v 10%, v ref = -5v, t a = -55 to 125 c unless otherwise specified ) p arameter s ymbol t est c ondition m in m ax u nits
memory 5 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit a/d converter 7672 12.19.01 rev 11 1000565 f igure 1. l oad c ircuits for a ccess t ime f igure 2. l oad c ircuit for b us r elinquish t ime
memory 6 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit a/d converter 7672 12.19.01 rev 11 1000565 f igure 3. f igure 4. a nalog i nput r ange c onfigurations
memory 7 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit a/d converter 7672 12.19.01 rev 11 1000565 f igure 5. u nipolar o perating u sing a r eference
memory 8 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit a/d converter 7672 12.19.01 rev 11 1000565 d24-02 note: all dimensions in inches 24 p in r ad -p ak ? d ual i n l ine p ackage s ymbol d imension m in n om m ax a -- 0.167 0.200 b 0.014 0.018 0.026 b2 0.045 0.050 0.065 c 0.008 0.010 0.018 d -- 1.200 1.280 e 0.510 0.594 0.620 ea 0.600 bsc ea/2 0.300 bsc e 0.100 bsc l 0.135 0.145 0.155 q 0.015 0.030 0.045 s1 0.005 0.025 -- s2 0.005 -- -- n24
memory 9 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit a/d converter 7672 12.19.01 rev 11 1000565 f24-01 note: all dimensions in inches 24 p in r ad -p ak ? f lat p ackage s ymbol d imension m in n om m ax a 0.153 0.168 0.183 b 0.015 0.017 0.022 c 0.004 0.005 0.009 d -- 0.596 0.604 e 0.350 0.400 0.420 e1 -- -- 0.450 e2 0.230 0.236 -- e3 0.030 0.082 -- e 0.050 bsc l 0.315 0.325 0.335 q 0.026 0.050 0.056 s1 0.005 0.020 -- n24
memory 10 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit a/d converter 7672 12.19.01 rev 11 1000565 important notice: these data sheets are created using the chip manufacturer?s published specifications. maxwell technologies verifies functionality by testing key parameters either by 100% testing, sample test ing 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 us e 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 tech- nologies. maxwell technologies? liability shall be limited to replacement of defective parts.
memory 11 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit a/d converter 7672 12.19.01 rev 11 1000565 product ordering options model number feature option details 7672 rp f x screening flow package radiation feature base product nomenclature monolithic s = maxwell class s b = maxwell class b e = engineering (testing @ +25c ) i = industrial (testing @ -55c, +25c, +125c) d = dual in-line package (dip) f = flat pack rp = r ad -p ak ? package 12-bit a/d converter -xx access time 05 = 5 ns 10 = 10 ns

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