'. 8 e 8 8 ,. analog w devices features "second generation" mos-lsi design large 0.43" (11mm) led displays 4* digit resolution - 40,000 counts full scale limited differential input either line powered (ad2025) or logic powered (ad2028) interchangeable with 4% digit dpms (ad2024 or ad2027) industry standard case designs applications high resolution/high accuracy readout for: test equipment process control instrumentation analytical and scientific instruments general description the ad2025 and ad2028 are low cost 4% digit dpms with large led displays. both units offer the same features and iden- tical performance, but the ad2025 is ac line powered and the ad2028 is +5v dc powered. the ad2025 and ad2028 are interchangeable with two 4\-2 digit dpms available from analog devices, the ad2024 and ad2027 respectively. thus, they can be used in applications where either a 4% or 4\-2 digit display may be desirable in one basic application. the benefits of second generation design the ad2025 and ad2028 are designed around mos-lsi (metal oxide semiconductor, large scale integration) inte- grated circuits which greatly reduce the number of components and interconnections required to provide the performance and features expected in a high resolution 4% digit dpm. this "second generation" design, therefore, offers greatly increased reliability and significantly lower cost at little com- promise in performance. the large 0.43 inch (11mm) led dis- plays offer the brightness and readability previously available only with gas discharge displays with the added advantage of an all solid state component. high resolution and versatile features these dpms measure dc input voltages over a full scale range of :t3.9999v or :t39.999v with an accuracy of :to.005% reading :to.005% of full scale :tl digit. using the "limited differential~, input first used by analog devices on the ad2010, the ad2025 and ad2028 prevent ground loop problems and pro- vide 50db of common mode rejection at common mode vol- tages up to :t200mv. normal mode rejection is 25db at 50-60hz. information furnished by analog devices is believed to be accurate and reliable. however. no responsibility is assumed by analog devices for its use; nor for any infringements of patents or other rights of third parties which may result from its use. no license is granted by implica- tion or otherwise under any patent or patent rights of analog devices. low cost 4% digit dpms with led displays -i j:" ~. ( 'ii.) , \." ...~. -;.~ \.\ . ~ .""> ~;'- . -.1 . \: "'~ '" " ' . ~'"'\ ., ...' ~., - . "."" . ,'- ~, j... ,~ bcd data outputs are provided in a bit parallel, character serial format compatible with cmos logic systems. when applica- tions require parallel bcd data, such as interfaces to printers, comparators or slave displays, parallel bcd output options are available that are compatible to standard ttl logic systems. external power supply outputs at +5v and -25v (-25v only on the ad2028) are made available for powering external cir- cuitry. in addition, control inputs for conversion "hold", display blanking and decimal point selection are provided. industry standard case designs although both the ad2025 and ad2028 have identical elec- trical designs, they are packaged in the case sizes that have become industry standards for ac line powered and +5v dc logic powered dpms respectively. the ad2025 fits the 3.924" x 1.682" (99.67 x 42.74mm) panel cutout common to most ac line powered dpms, and the ad2028 fits the 3.175" x 1.810" (80.65 x 45.97mm) panel cutout of the analog devices logic power case design, now used by several other manufacturers of logic powered dpms. thus, interchangeability is assured, allowing mechanical second sourcing for both these dpms. designed and built for reliability even beyond the reliability advantages of the lsi-ic design and led displays, the ad2025 and ad2028 have had extreme care taken in their design and manufacture to insure reliability. manufacturing processes are monitored by continual quality assurance inspections to insure proper workmanship and test- ing. automatic test equipment is used to test each dpm thor- oughly and without error. and each ad2025 and ad2028, like every analog devices dpm, receives a full one week failure- free burn-in with power cycling before shipment. p.o. box 280; norwood, massachusetts 02062 u.s.a. tel: 617/329-4700 twx: 710/394-6577 telex: 924491 cables: analog norwoodmass obsolete
specifica tions (typical at +25c and nominal power supply voltage) external power supply outputs . ad2025: +5v at 25ma, -25v at sma . ad2028: -25v at sma power supply inputs . ad2025: ac line, 50-60hz, 4w . ad2028: 5v dc, :!:5% at 800ma calibration adjustments . gain . zero . recommended recalibration interval: 6 months display outputs . seven segment led display, 0.43" (llmm) high, for four data digits and 300% overrange. . overload indication by blanking all digits except over- range, which indicates "0". . decimal points (5) selectable at input. . display blanking analog input . configuration: bipolar, limited differential . full scale range: :!:3.9999v (:!:39.999v, "v" option) . automatic polarity (see applications section for details on polarity display) . input impedance: 1o0mn (lmn. "v" option) . bias current: 30na (3na, "v" option) . overvoltage protection: 120v rms sustained accuracy . :!:0.005% reading :!:0.005% full scale:!:1 digiti . resolution: 100llv (lmv, "v" option) . temperature range2: 0 to +50c operating. -20 to +85c storage. (ad2025/b: 0 to +45c operatin8) . temperature coefficient: gain: :!:30p~m/ c. zero offset: :!:lollv/c (:!:40ppm/c and :!:ioollv/ c, "v" option) . warmup time: one minute to rated accuracy . settling time to rated accuracy: 450ms normal mode rejection . 25db at 50-60hz common mode rejection . 50db, dc to 1khz, :!:200mv common mode voltage . ad2025 (floated on power supply transformer if data out- puts and control signals are not used) - ii0db at 120v rms common mode voltage, ikn imbalance at input. conversion time . 300ms for full scale reading . 400ms for overload conversion conversion rate . 3 conversions per second digital interface signals . inputs display blank - (open collector ttl compatible, 4 ttl loads). logic "0" or grounding blanks display, but not decimal points. the display is valid immediately upon removal of the blanking signal. hold - (dtl/ttl compatible, 2 ttl loads). logic "0" or grounding causes the dpm to hold and display the last conversion. upon removal of the hold, the dpm resumes conversions. decimal points - (not ttl compatible). logic "0" or grounding turns on appropriate decimal point. external circuitry must sink 35ma when a decimal point is illuminated. . outputs dtl/ttl compatible3 - status. logic" 1" indicates con- version in process. all digital outputs are valid when status is at logic "0". 4 ttl loads. - polarity. logic "i" indi- cates positive polarity, unlatched. 6 ttl loads. - over- load, logic "i" indicates overload (:;>40,000), unlatched 4 ttl loads. cmos and lp schottky compatible - bcd outputs, 4% bcd digits, character serial, bit parallel, i lp schottky load. parallel bcd output (option"b"). - 4% bcd digits, positive true, latched. drives 5 ttl loads. - data ready. logic" i" indicates output data is valid. drives 2 ttl loads. - polarity. logic "i" indicates positive polarity, latched, drives 2 ttl loads. - size . ad2025: 3.92"w x 1.67"h x 4.48"d (l00 x 42 x 114mm) panel cutout: 3.930" x 1.682" (99.8 x 42.7mm) . ad2028: 3"w x 1.8"h x 4"d (76 x 46 x 102mm) panel cutout: 3.175" x 1.810" (80.65 x 45.97mm) weight . ad2025: 14 ounces (395 grams) . ad2028: 10 ounces (280 grams) options - ordering guide4 . ad2025 ac power inputs - no cost option ad2025 - 117v ac ! ad2025/e - 220v ac ad2025/f - 100v ac :!:io% ad2025/h - 240v ac input range options - no cost option ad2025 - :!:3.9999v full scale ad2025/v - :!:39.999v full scale data output options ad2025 - character serial data outputs ad2025/b - parallel bcd option display lens options5 lens 7 - red with adi logo lens 8 - red without adi logo connector - 36 pin, 0.156" spacing, card edge connector, viking 2vk18dil-2 or equivalent. - optional: order ac2610. ad2025/b option also requires a 30 pin, 0.156" spacing, card edge connector, viking 2vki5d/i-2 or equivalent. - optional: order aci501. . ad2028 input range options - no cost option ad2028 - :!:3.9999v full scale ad2028/v - :!:39.999v full scale data output options ad2028 - character serial data outputs ad2028/b - parallel bcd option display lens options5 lens 5 - red with adi logo lens 6 - red without adi logo connector - aci501 (see above) or equivalent. ad2028/b option requires two each. notes 1 guaranteed at +25c and nominal power supply voltage. 2 guaranteed. 3 for cmos compatibility, 3.3k pullup resistors to the +5v output of the dpm are required. 4 only one ac power input and/or input range option may be specified. the "8" option can be ordered with any combination of power and range options. 'if no lens is specified, lens 5 or 7 is supplied as appropriate. specifications subject to change without notice. -2- -- . 8 8 8 -- obsolete
parallel.data ready flag (note 2) 8 - 8 8 applying the ad2025 and ad2028 wirim! connections figures 1 and 2 are wiring diagrams for ad2025 and ad2028 applications. the "limited differential" input uses a loon resistor to isolate the analog input from the digital and power supply sections to prevent ground loop problems. the analog input must be connected between the "analog high" and "analog ground" inputs only, since in some applications there may be up to a :t200mv cmv difference between analog and digital grounds. "">cog high '.k figure 1. ad2025 wiring interconnections figure 2. ad2028 wiring interconnections polarity indication no direct polarity indication is provided on the ad2025 or ad2028 although both dpms measure bipolar inputs. if indication of negative polarity is desired, the "polarity" out- put can be connected to the far left-hand decimal point (dp .xxxxx) provided. when the polarity is negative, this decimal point will then be illuminated. interfacing data outputs the standard data outputs are in a bit parallel character serial format compatible to cmos and lp schottky logic systems. the bcd outputs are multiplexed, and a digit output is pro- vided for each of the five digits of output. thus, the four bcd lines on the output at a given time are valid for the digit whose digit line is currently high. the bit parallel character serial data is valid when the dpm status line is low for a period of 150ms between each conversion cycle. the overload line is latched output which is at logic "1", whenever the input exceeds the full 40,000 count range. optional parallel bcd outputs ("b" option) are available on a separate card which is internally connected to the dpm. the output data then is presented in a full parallel format and is latched. the parallel data is valid whenever the data ready output is high. pin connections for the "b" option are shown in the intercon- nection tables and a full timing diagram is shown in figure 3. integration cycle j i i i i ' " -- ". ',' "', signal reference i oil recover & i integrate integrate i idle time i ,150m? (200n" max) : (150m> min) i status ~ i r i i , i ';;;:i~ .s,;:~~~ ~ ~/#// a- , i i i : u ! --i i-- note 1 i ii para~~~~,;da t a w///ffff/////////////////// / // /$//// / / // / // . note 1. approximate sm> reouired to load parallel.qut registers. note 2. boption. figure 3. ad2025/ad2028 timing diagram note 1: bcd multiplexer clock pulse available for remote placement of bcd option. ad2025 - signal and pin connections ad2028 - signal and pin connections notes: 11 overload output is on main dpm connector. 21 pins marked "in" are made available for remote placement of bcd option card and are not normally used since all connections are intemal. ad2025/ad2028 bcd options - signal and pin connections -3- pin function pin function 1 analog gmund a analog high 2 10' digit b 10' digit (lsdi =key = key 3 bcd2 c 10' digit 4 10' digit d bcd 4 s bcd8 e bcd 1 6 mux step' f 10' digit imsdi . 7 +5v de (out) h -25v de (outl 8 nc j nc 9 ac high k ac high 10 nc l nc ii ac return m ac return 12 nc n nc 13 digital ground p digital gryund 14 dp .xxxxx r status 15 polarity s hold 16 display blank t dpx.xxxx 17 dpxxxx.x u dpxx.xxx 18 overload v dpxxx.xx pin function pin function 1 analog high a analog ground 2 10' digit (lsdi b mux step' 3 bcd 8 c bcd 1 4 bcd 2 d bcd 4 5 10' digit (msd) e 10' digit 6 10' digit f 10' digit 7 nc h -25v de (out) 8 power ground j digital ground 9 +5v (in) k +5v (in) 10 nc l nc =key = key 11 display blank m dp.xxxxx 12 hold n polarity 13 overload p status 14 dpx.xxxx r dpxx.xxx 15 dpxxx.xx s dpxxxx.x pin function 1 i +5v de linl 2 i bcd i (lnl = key 3 bcd 4 (lnl 4 bcd 2000 5 bcd 40 6 bcd 800 7 bcd 100 8 bcd 10,000 9 bcd 20 10 bcd8 11 bcd 1 12 bcd 400 13 data ready 14 polarity ilnl 15 polarity (out) pin function a bcd 20,000 b i bcd 8 (in) = key c bcd 2 (inl d bcd4 e bcd 80 f bcd 8000 h bcd 1000 j bcd 200 k bcd2 l bcd 10 m bcd 4000 n 10' digit (lnl p status iinl r mux step (lnl s digi"'l ground obsolete
f- 4.215 (107.1) 5.10 (130) 0000000 ad2025 power supply input - 0 11 7 vac 50~60 hz e 0 220 vac 50-60 hz f 0 100 vac 50-60 hz h 0 240 vac 50-60 hz input range data output - 0 :1:3.9999 vdc b 0 parallel v 0 :l:39.999vdc bcd . denotes option 00000 00000 00000 "analog lilli devices made in u.s.a. kev belween pin 2 & 3 \ p\ 30 pin connector (b option onl v) 3.92 (99.6) snap-in mounting block a s@ mounting block tension screws . / ~analog ' r . xl woevices x made in usa -j-l 0.265 (6.73) 4.48 (114) "- mounting block 15 a kev belween pin 2 & 3 v \ pi, 36 pin connector 3.420 (86.9) max ad2028 4.630 (117.6) max input range - 0 :1:3.9999 vdc v 0 :1:39.999 vdc data output b 0 parallel bcd . denotes option .. analog lilli devices patent #3793563 made in u.s.a. -li 0.155 (3.94) max 4.085 (104) max i~ ~ ~i f-==3.020 (76.7) max==--! p2, 30 pin connector, b option onl y 15 s p1, 30 pin kev belween connector pin 10 & 11 gain adjust lens front view i(" ". input offset adjust ' |
