View 7820_782515.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

m e m o r y 2 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. microprocessor-compatible 8-bit adc 7820 09.09.03 rev 3 t able 1. p in d escription p in s ymbol d escription 1v in analog input range: v ref(-) to v ref(+) . 2 db0 data output. three state output, bit 0 (lsb) 3 db1 data output. three state output, bit 1 4 db2 data output. three state output, bit 2 5 db3 data output. three state output, bit 3 6wr /rdy write control input/ready status output. 7 mode mode selection input. it determines whether the device operates in the wr-rd or rd mode. it is internally tied to gnd through a 50 a current source. 8rd read input. rd must be low to access data from the part. 9int interupt output. int going low indicates that the conversion is com- plete int returns high on rising the edge of rd or cs . 10 gnd ground 11 v ref- lower limit of reference span. range: gnd < v ref(-) < v ref(+) 12 v ref+ upper limit of reference span. range: gnd < v ref(-) < v ref(+) < v dd 13 cs chip select input. cs , the decoded device address, must be low for rd or wr to be recognized by the converter. 14 db4 data output. three state output, bit 4 15 db5 data output. three state output, bit 5 16 db6 data output. three state output, bit 6 17 db7 data output. three state output, bit 7 (msb) 18 ofl overflow output. if the analog input is higher than (v ref(+) - 1/2lsb), ofl will be low at the end of conversion. it is a non three state output which can be used to cascade 2 or more devices to increase resolution. 19 nc no connection. 20 v dd power supply voltage, +5v t able 2. 7820 a bsolute m aximum r atings 1 p arameter m in m ax u nit v dd to gnd -0 7.0 v digital input voltage to gnd (pins 6-80, 13) -0.3 v dd +0.3 v digital output voltage to gnd (pins 2-5, 9, 14-18) 0.3 v dd +0.3 v v ref (+) to gnd 0 v dd +0.3 v v ref (-) to gnd v ss -0.3 v ref (+) v
m e m o r y 3 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. microprocessor-compatible 8-bit adc 7820 09.09.03 rev 3 v in to gnd -0.3 v dd +0.3 v operating temperature -55 125 c storage temperature range -65 150 c power dissipation to 75c -- 450 mw derates above +75c -- 6 mw/c 1. caution : esd (electrostatic discharge) sensitive device. the digital control inputs are diode protected; how- ever, permanent damage may occur on unconnected devices subject to high energy electrostatic fields. unused devices must be stored in conductive foam or shunts. the protective foam should be discharged to the destina- tion socket before devices are inserted. t able 3. 7820 dc e lectrical c haracteristics (v dd = +5v; v ref (+) = +5v; v ref (-) = gnd = 0v, unless otherwise specified ) (rd m ode (p in 7 = 0v)) (t a = -55 to 125 c unless otherwise specified ) p arameter t est c onditions s ubgroups m in t yp m ax u nit accuracy resolution -- 8 -- -- bits total unadjusted error 1 -- -- -- 1.0 lsb minimum resolution for which no missing codes are guaranteed -- -- -- 8 bits reference input input resisitance -- 1, 2, 3 1.0 -- 4.0 k ? v ref (+) input voltage range -- 1, 2, 3 v ref (-) -- v dd v v ref (-) input voltage range -- 1, 2, 3 gnd -- v ref (+) v analog input input voltage range -- 1, 2, 3 v ref (-) -- v ref (+) v input leakage current -- 1, 2, 3 -- -- 3 a input capacitance 2 -- 1, 2, 3 -- 45 -- pf logic inputs cs , wr , rd v inh -- 1, 2, 3 2.4 -- -- v v inh -- 1, 2, 3 -- -- 0.8 v i inh (cs , rd ) -- 1, 2, 3 -- -- 1 a i inh (wr ) -- 1, 2, 3 -- -- 3 a i inl (wr ) -- 1, 2, 3 -- -- -1 a input capacitance 2 -- 1, 2, 3 -- 5 8 pf t able 2. 7820 a bsolute m aximum r atings 1 p arameter m in m ax u nit
m e m o r y 4 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. microprocessor-compatible 8-bit adc 7820 09.09.03 rev 3 mode v inh -- 1, 2, 3 3.5 -- -- v i inh -- 1, 2, 3 -- -- 200 a i inl -- 1, 2, 3 -- -- -1 a input capacitance 2 -- 1, 2, 3 -- 5 8 pf logic outputs db0-db7, ofl , int v oh isource = 360 a 1, 2, 3 4 -- -- v v ol isink = 1.6 ma 1, 2, 3 -- -- 0.4 v i out (db0-db7) floating state leakage 1, 2, 3 -- -- 3 a output capacitance 2 -- 1, 2, 3 -- 5 8 pf rdy v ol isink = 2.6ma 1, 2, 3 -- -- 0.4 v i out floating state leakage 1, 2, 3 -- -- 3 v output capacitance 2 -- 4, 5, 6 -- 5 8 pf slew rate, tracking 2 -- 1, 2, 3 -- 0.2 0.1 v/ s power supply v dd 5% for speci- fied perfor- mance 1, 2, 3 -- -- 5 v i dd cs = rd = ov 1, 2, 3 -- -- 20 ma power dissipation -- 1, 2, 3 -- 40 -- mw power supply sensitivity vdd = 5v 5% 1, 2, 3 -- 1/16 1/4 lsb 1. total unadjusted error includes offset, full scale and linearity error. 2. guarenteed by design. t able 3. 7820 dc e lectrical c haracteristics (v dd = +5v; v ref (+) = +5v; v ref (-) = gnd = 0v, unless otherwise specified ) (rd m ode (p in 7 = 0v)) (t a = -55 to 125 c unless otherwise specified ) p arameter t est c onditions s ubgroups m in t yp m ax u nit
m e m o r y 5 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. microprocessor-compatible 8-bit adc 7820 09.09.03 rev 3 t able 4. 7820 ac e lectrical c haracteristics 1 (v dd = +5v; v ref (+) = +5v; v ref (-) = gnd = 0v, unless otherwise specified ) (rd m ode (p in 7 = 0v)) (t a = -55 to 125 c unless otherwise specified ) 1. sample tested at 25c to ensure compliance. only on process design change. p arameter s ubgroups s ymbol m in m ax u nit cs to rd /wr setup time 9, 10, 11 t css 0--ns cs to rd /wr hold time 9, 10, 11 t csh 0--ns cs to delay time (pull-up resistor = 5k ? 9, 10, 11 t rdy -- 100 ns conversion time (rd mode) 9, 10, 11 t crd -- 2.5 s data access time (rd mode) 9, 10, 11 t accd -- t crd + 50 ns rd to int delay (rd mode) 9, 10, 11 t inth -- 225 ns data hold time 9, 10, 11 t dh -- 100 ns delay time between conversions 9, 10, 11 t p 600 -- ns write pulse width 9, 10, 11 t wr 600 -- ns -- 50 s delay time between wr and rd pulses 9, 10, 11 t rd 700 -- ns data access time (wr-rd mode) 9, 10, 11 t acc1 -- 250 ns rd to int delay 9, 10, 11 t r1 -- 225 ns wr to int delay 9, 10, 11 t intl -- 1700 ns data access time (wr-rd mode) 9, 10, 11 t acc2 -- 110 ns wr to int delay (stand-alone operation) 9, 10, 11 t ihwr -- 150 ns data access time after int (stand-alone operation 9, 10, 11 t id -- 75 ns
m e m o r y 6 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. microprocessor-compatible 8-bit adc 7820 09.09.03 rev 3 f igure 1. l oad c ircuits f or d ata a ccess t ime t est f igure 2. l oad c ircuits f or d ata h old t ime r eset
m e m o r y 7 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. microprocessor-compatible 8-bit adc 7820 09.09.03 rev 3 f igure 3. l oad c ircuit for a ccess t ime f igure 4. l oad c ircuit for o utput f loat d elay
m e m o r y 8 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. microprocessor-compatible 8-bit adc 7820 09.09.03 rev 3 f igure 5. a ccuracy vs . t wr f igure 6. a ccuracy vs . t rd
m e m o r y 9 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. microprocessor-compatible 8-bit adc 7820 09.09.03 rev 3 f igure 7. a ccuracy vs . t sp f igure 8. a ccuracy vs . t ref [v ref = v ref (+) - v ref (-)]
m e m o r y 10 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. microprocessor-compatible 8-bit adc 7820 09.09.03 rev 3 f igure 9. s ignal -n oise r atio vs . i nput f requency f igure 10. t intl i nternal t ime d elay vs . t emperature
m e m o r y 11 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. microprocessor-compatible 8-bit adc 7820 09.09.03 rev 3 f igure 11. o utput c urrent vs . t emperature f igure 12. o perating s equence (wr-rd m ode )
m e m o r y 12 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. microprocessor-compatible 8-bit adc 7820 09.09.03 rev 3 f igure 13. rd m ode f igure 14. wr-rd m ode (trd>tintl)
m e m o r y 13 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. microprocessor-compatible 8-bit adc 7820 09.09.03 rev 3 f igure 15. wr-rd m ode (t rd m e m o r y 14 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. microprocessor-compatible 8-bit adc 7820 09.09.03 rev 3 f igure 17. p ower s upply as r eference f igure 18. i nput n ot r eferenced to gnd
m e m o r y 15 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. microprocessor-compatible 8-bit adc 7820 09.09.03 rev 3 f igure 19. e quivalent i nput c ircuit f igure 20. rc n etwork m odel
m e m o r y 16 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. microprocessor-compatible 8-bit adc 7820 09.09.03 rev 3 note: all dimensions in inches 20 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 -- 0.202 0.230 b 0.014 0.018 0.026 b2 0.045 0.050 0.065 c 0.008 0.010 0.018 d -- 1.000 1.060 e 0.220 0.295 0.310 ea 0.300 bsc ea/2 0.150 bsc e 0.100 bsc l 0.135 0.145 0.155 q 0.015 0.045 0.070 s1 0.005 0.025 -- s2 0.005 -- -- n20
m e m o r y 17 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. microprocessor-compatible 8-bit adc 7820 09.09.03 rev 3 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 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 tech- nologies. maxwell technologies? liability shall be limited to replacement of defective parts.

▲Up To Search▲

Price & Availability of 7820

	To Download 7820 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .