LTC1049 LINER | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 9
Technical content
TECHNOLOGY Low Power Chopper Stabilized Operational Amplifier with Internal Capacitors FEATURES DESCRIPTION © Low Supply Current 200,A The LTC 1049 is a high performance, low power chopper = NoExternal Components Required stabilized operational amplifier. The two sample-and-hold = Maximum Offset Voltage 10V capacitors usually required externally by other chopper = Maximum Offset Voltage Drift 0.1uV/°C stabilized amplifiers are integrated on the chip. Further, the = Single Supply Operation 4.75V to 16V LTC1049 offers superior DC and AC performance with a ® Input Common Mode Range Includes Ground nominal supply current of only 200nA. = Output Swings to Ground . i . The LTC1049 has a typical offset voltage of 0.5,V, with ™ Typical Overload Recovery Time Gms drift of 0.01HW/PC, 0.1H2 to 10H2 input noise voltage of 3,Vp-p and typical voltage gain of 160dB. The slew rate APPLICATIONS is 0.8V/us with a gain bandwidth product of 0.8MHz. = AmA-20mA Current Loops Overload recovery time from a saturation condition is = Thermocouple Amplifiers 6ms, a significant improvement over chopper amplifiers . Electronic Scales ; using external capacitors. = Medical Instrumentation © Strain Gauge Amplifiers The LTC1049 is available in a standard 8-pin metal can, = High Resolution Data Acquisition plastic and ceramic dual in line packages as wellas an 8-pin SO package. The LTC1049can bea plug-in replacement for most standard op amps with improved DC performance and substantial power savings. ES TYPICAL APPLICATION Single Supply Thermocouple Amplifier 0.068 uF Vw #5 286% , FOR 0° TO 400° (710258 : . * ote Go __r~ | TYPEK ET SUPPLY CURRENT = 2601/4 a LT LEAR 1
ABSOL UTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION Output Short Circuit Duration... Indefinite iw ve Operating Temperature Range th Fe] our
4 NB PACKAGE
«Oy re: Ne LTc1049¢s8 -w 2] ve +n BY > [5] our
38 PAKAGE
ELECTRICAL CHARACTERISTICS Vs = +5V, Ta = operating temperature range, unless otherwise specified. a PARAMETER MIN TYP MAX unis inpt Ose Voge A Average input Otset Dit [iwotegy fe 000 0 vee Long Temfsetvotaeoat [0 i OF +150 a A +150 O.1He to tH put Noise Current { fetone (ote) Tite Zanmon Mode ReeconRabo | VeweV-w2V ———sif* | eS Power Supply Rejection Ratio [ Vees2a7sviosv Te [mo ao “ae Sonal Vora Gain [atone fe | Vaximum Output Voltage Swing RLST0KQ— Ta=25°C [ | 4ADS—=~sSC(‘é‘ fe | =46432 0 a Siew Rate | Rust0K0, Ci=SopF PP Ns 3ain Bandwidth Product a Spy Cure i ee pep 0 ternal Sampling Frequency ee 2 UU EEEInnE
2 LT Wee
The @ denotes the specifications which apply over the full operating ‘Note 3: These parameters are guaranteed by design. Thermocouple temperature range effects preclude measurement of these voltage levels in high speed ‘Note 1: Absolute Maximum Ratings are those values beyond which the automatic test systems. Vog is measured to a limit determined by test life of the device may be impaired. equipment capability. Note 2: Connecting any terminal to voltages greater than V* or less than Note 4: Current Noise is calculated from the formula: ‘V~ may cause destructive latch-up. It is recommended that no sources I= V(2q + 1b) operating from external supplies be applied prior to power-up of the where = 1.6 x 10-"8 Coulomb. LTC1049. SEE Electrical Characteristics Test Circuit tM In | + output 4 RL DC to 10Hz and DC to 1Hz Noise Test Circuit [7 a
2 Re 3
=F = BANOWOTH «RY RZD 10H 1620 162k 162k 1620 ORF 1.OuF 1.0uF tHe 1620 162k 182k 16k L.OMF MF OnE Se
TYPICAL PERFORMANCE CHARACTERISTICS C Mode Input Ri Voltage Noise vs Frequency Supply Voltage npuifangevs wo Gain/Phase vs Frequency 0 ‘ i : i a Mo = 1 : Ce SIRS s | = — 0 mo we BU § ee SURI TNabtyS 2 EOraitAU A RPEESEOSREERTEeS CE Ey é AI = 2 ee NT 8 Fi a NK ges) 8 SO TICTIMCTIIPNACTI ee 8 * ol itt Me BLS FF Es «UIC EPPS oe 1 A 10 100 ik 10k 100k O 21 22 43 #4 +5 46 47 28 ik 1 1 ‘FREQUENCY (H2) penn eon SUPPLY VOLTAGE (V) _ FREQUENCY (Hz) revue Output Short Circuit Ct It ‘Supply Current vs Supply Voltage ‘Supply Currentvs Temperature /_Sumvotage weniys Se a ee = 08 Let ett is aN a, Caeeee ie Loe PooRSERH PROS Bm] Sel | PSR og rei e@™ TTP g ye 2 eEN aan a 3 S SS EHH PSS Pot YY saonyuanage iemenoe nv CMARveFrequency upply Voltage a0 : ‘ = aig = 2 120 +H = BECCCCH HIN a 3 aon a NEETTE FINO é ae BS TINT i : = CAN 3 soo EA to «Hite hs TERT oT TT th ‘no a oS a TOTAL SUPPLY VOLTAGE, vwrove AMBIENT TEMPERATURE (°C) FREQUENCY (Hz) rotenone ee 4 y @ Abia)
TYPICAL PERFORMANCE CHARACTERISTICS . Overload Recovery ‘Small Signal Transient Response Large Signal Transient Response 400m ozo J conv ev —— ov S “step STEP / %» = AL awow 2 sow sus -8v asms/0W . Ay = #1, = 10k, = S09F, Ve= 450 ‘y= #4, R= 10k, = S0pF. Vs = #5V LTC1049 DC to 1Hz Noise Pt | | Vs = 28V wosevocas WV w(t Mey "UMP tw A Na NY Ue x TINE tos a LTC1049 DC to 10Hz Noise nse vocrace TW he | i Myth eu yd Hi Ll soe nose TINE sv sro mee LT Winner 5
ACHIEVING PICOAMPERE/MICROVOLT PERFORMANCE Picoamperes component selection. It is good practice to minimize the . , number of junctions in the amplifier’s input signal path. In order to realize the picoampere level of accuracy of the avoiq connectors, sockets, switches, and relays where 1101049, proper caremust be exercised. Leakage currents possible. in instances where this is not possible, attempt in circuitry external to the amplifier can significantly de- t) halance the number and type of junctions so that grade performance. High quality insulation shouldbeused —itferential cancellation occurs. Doing this may involve (e.9., Teflon, Kel-F); cleaning of all insulating surfaces geliperately introducing junctions to offset unavoidable to remove fluxes and other residues will probably be junctions necessary — particularly for high temperature perfor- ° mance. Surface coating may be necessary to provide a pACKAGE-INDUCED OFFSET VOLTAGE moisture barrier in high humidity environments. a a . Package-induced thermal EMF effects are another impor- Board leakage can be minimized by encircling the input tant sourceoferrors. Itarisesat the copper/kovar junctions connections with a guard ring operated ata potential close formed when wire or printed circuit traces contact a pack- to that of the inputs: in inverting configurations the guard —_age jead. Like all the previously mentioned thermal EMF fing should betiedto ground; innon-invertingconnections effects, it is outside the LTC1049's offset nulling loop and to the inverting input. Guarding both sides of the printed cannot be cancelled. The input offset voltage specification circuit board is required. Bulk leakage reduction depends —_ of the T1049 is actually set by the package-induced on the guard ring width. warm-up drift rather than by the circuit itself. The thermal time constant ranges from 0.5 to 3 minutes, depending on Microvolts package type. Thermocouple effects must be considered ifthe LTC1049's ultra low drift is to be fully utilized. Any connection of LOW SUPPLY OPERATION dissimilar metals forms a thermoelectric junction produc- The minimum supply for proper operation of the LTC1049 ing an electric potential which varies with temperature _ is typically below 4.0V (+2.0V). In single supply applica- (Seebeck effect). As temperature sensors, thermocouples _ tions, PSRRis guaranteed downto 4,7V (+2.35V) toensure exploit this phenomenon to produce useful information. proper operation down to the minimum TTL specified In low drift amplifier circuits the effect is a primary source —_ voltage of 4.75V. of error. Connectors, switches, relay contacts, sockets, resistors, PIN COMPATIBILITY solder, and even copper wire are all candidates for © The LTC1049 is pin compatible with the 8-pin versions of thermal EMF generation. Junctions of copper wire from 7650, 7652 and other chopper-stabilized amplifiers. The different manufacturers can generate thermal EMFs of 7650 and 7652 require the use of two external capacitors 200nV/°C — twice the maximum drift specification connected to pin 1 and 8 which are not needed for the of the LTC1049. The copper/kovar junction, formedwhen —LTC1049. Pins 1,5, and 8 ofthe LTC 1049 are not connected wire or printed circuit traces contact a package lead, _ internally; thus the LTC1049 can be a direct plug in for the has a thermal EMF of approximately 35uV/°C — 300 7650 and 7652 even if the two capacitors are left on the times the maximum drift specification of the LTC1049. _ circuit board. Minimizing thermal EMF-induced errors is possible if judicious attention is given to circuit board layout and ee aoe
‘Low Power, Low Hold Step Sample and Hold Low Power, Single Supply, Low Offset Instrumentation Amp sv 198k 2.00 200k 198% BL Lssyy Lit 1020 eae Vv trceot “trc104@. > Your Your 3 2. shane 3 3 vw t wat q qd
1 DROOP < tmvis
i Vi HOLD STEP's 20nV 4 V V - 7 oaTue Ig = 250H4 TYP ‘ “om 3a MYLAR GAIN = 100 ig = 400A nomo-ce CCMIRR 2 60B, WITH 0.1% RESISTORS (RESISTOR LIMITED) Thermocouple Based Temperature to Frequency Converter ree K o.02uF 6 at THERMO- Ww 203904 COUPLE toe NC son | Pd urs x L ee ww ercioe 2906 Ce > oureut St ant ct 7 On tke = 88) 3 100pF ca 0.47 3009 13 240% T “6 = 100"e ‘ TRIN =F areal et p----=-4-=--- =~, 1 6 st
1 V Vv 1
1 H ~ | 1
1 ett Noted! * = IRCTRW-MTR-B! 612099 | st ce St ' t = POLYSTYRENE Hq 2900 * ' 1 ' Does ne 1 1 1 1 Ig-= 360A
4 Sa se H SUPPLY RANGE = 48V-+10V
‘ 24 3 647 ' 1 Sle! . ' A A wat t i 8 aay yapnneen cranes SS Information turished by Linear Tecnology Corporation s believed tobe accurate and relable However, PROLOG inlerconnecon ofits creuts as described herein wil ot intige on existing pant igh.
PACKAGE DESCRIPTION dimensions in inches (millimeters) unless otherwise noted. namo 8-Lead Ceramic DIP {7378.13} 9.200, & lo Max MN) [40s | (0381 1524) 9.025, os Wma = cy oe erey re ee f Sa=0) ozob0s0 ° Satay oes 0025 | priretes an EASE eso. oxtoso.oe cos [tt aaa 23021 Fea Fr [Tome [8m] 8-Lead Plastic DIP 030-050 . ersesn08s ows 0 id Ten ina wax “ rf ELE af 2.008- 0.015, 0.125 oo-18H cual » err soos u sao 0329 “bons aos 00 _,| “ tare) BE ee ae! | ‘one! 0.10020.010 eo! [a 1820.08 Mt oe ancy ars on $8 Package 8-Lead Plastic SOIC _ 0010-0000 , 2183-0069 9-067 a aria) ouos-ooe — fe ‘0.008 0.010 oro es 7 6 5 oatEy ar fool cine 0016-908 aa ozo74 <p 018-2080 a oxesome owotors ap=1 275) ous-oos ve eaten a= 33a cary roves a
1 FR nama: Past
- LEAD MATERIAL 42, TIN PLATED. ' 2 a « Tawa Tea a - - SI
8 Linear Technology Corporation 7 LINCAD
‘eWecaty Nd, Migs C2 S87 AT UNcAR (Em) 2 NoVA by ten) eee a co unean ecniSantt conteeaten as
f y LIN j \\2 SPECIFICATION NOTICE TECHNOLOGY LTC 1049 August 1996 The Large-Signal Voltage Gain of the LTC®1049 is tested with the condition of Voyy = +4.75V. For complete specifications, typical performance curves and applications information, please see the LTC1049 data sheet. £7LTC and LT are registered trademarks of Linear Technology Corporation. ELECTRICAL CHARACTERISTICS Vg = t5V, Ta = operating temperature range, unless otherwise specified. PARAMETER [conpmons TP ma | units Large-Signal Voltage Gain [R= 100kVour=2475V fet i390 60 For further information regarding this specification notice contact: Linear Technology Corporation 1630 McCarthy Bivd. Milpitas, California 95035-7417 Attn: Product Marketing Manager Phone: (408) 432-1900 RR TT