Not Recommended for new Designs .. IntegratedCircuit ,. ANALOG W DEVICES PrecisionInstrumentationAmplifier AD521 I FEATURES PIN CONFIGURATION Programmable Gainsfrom 0.1 to 1000 Differential Inputs + INPUT I 1 141 ~AIN HighCMRR: 11OdBmin Low Drift: 2p.Vfc max (L) GAI~ 12 131 ~ALE Complete Input Protection, Power ON and Power OFF Functionally Complete with the Addition of Two Resistors Internally Compensated OFFSET Gain Bandwidth Product: 4OMHz I TRIM 4 Output Current Limited: 25mA Very LowNoise: 05p.V p-p, 0.1Hzto 10Hz, RTI (I G -1000 Chips are Available OFFSET I 9 ICOMPo TRIM 8 a OUTPUT I 7 81 v+ PRODUCT DESCRIPTION +70C.The grade guarantees performance to specification The AD521 is a second generation, low cost, monolithic IC over the eXtended temperatUre range: -SSoCto +125C. instrUmentation amplifier developed by Analog Devices.As a PRODUCT HIGHLIGHTS trUe instrUmentation amplifier, the AD521 is a gain block with 1. The ADS21 is a trUe instrumentation amplifier in integrated differential inputs and an accurately programmable input/ circuit form, offering the user performance comparable to output gain relationship. many modular instrumentation amplifiers at a fraction of the cost. The AD521 IC instrUmentation amplifier should not be con- fused with an operational amplifier, although several manu- 2. The AD521 has low guaranteed input offset voltage drift factUrers(including Analog Devices)offer op amps which can (21lVf C for L grade) and low noise for precision, high gain be used as building blocks in variable gain instrumentation applications. amplifier circuits. Op amps are general-purpose components 3. The AD521 is functionally complete with the addition of which, when used with precision-matched external resistors, two resistors. Gain can be preset from 0.1 to more than can perform the instrUmentation amplifier function. 1000. An instrumentation amplifier is a precision differential volt- 4. The AD521 is fully protected for input levelsup to 15V age gain device optimized for operation in a real world envi- ronment, and is intended to be used wherever acquisition of a beyond the supply voltages and JOV differential at the useful signal is difficult. It is characterized by high input im- inputs. pedance, balanced differential inputs, low bias currents and 5. Internally compensated for all gains, the AD521 also offers high CMR. the user the provision for limiting bandwidth. As a complete instrUmentation amplifier, the AD521 requires 6. Offset nulling can be achieved with an optional trim pot. only two resistors to set its gain to any value between 0.1 and 7. The AD521 offers superior dynamic performance with a 1000. The ratio matching of these resistors does not affect the gain-bandwidth product of 40MHz, full peak response of high CMRR (up to 120dB) or the high input impedance (3 X 100kHz (independent of gain) and a settling time of 5p.s 109il) of the AD521. Furthermore, unlike most operational to 0.1% of a 10V step. amplifier-based instrUmentation amplifiers, the inputs are protected against overvoltagesup to :1:15volts beyond the supplies. The AD521 IC instrumentation amplifier is available in four different versions of accuracy and operating temperatUre range. The economical grade, the low drift grade, and the lower drift, higher linearity grade are specified from 0 to -~ ~-- ~ . ~ 01:: / 1 Not Recommended for new Designs AD521-SPECIFICATIONS(typical Vs = :t15V, RL= 2kO and TA= +25Cunlessotherwisespecified) AD521SD AD5HW AD521JD AD521KD (AD5HSDI883B) ~ GAIN I to 1000 Ra..e (For Spocified Operation, Note I) Equation G. Rs/RC V/V (to.25~.004G)% Error from Equation Nonlin..rity (NatO 2) I..G<IOOO 0.2% max 0.1% max . Gain Temporaturo fficient t(l5 to.4G)fmtc t(3 to.05G)fmtC OUTPUT CHARACTERISTICS UOV, tlOmA min RatOd Output tlOV SmA min Output at Maximum Oporati.. Temporaturo 0.10 Impodance DYNAMIC RESPONSE Small Signal Bandwidth (13dB) G=I >2MHz G= 10 300kHz G= 100 200kHz G = 1000 40kHz Small Signal, t1.0% Flatn..s G=I 75kHz G= 10 26kHz G= 100 24kHz 6kHz G = 1000 100kHz Full Peak Response (NatO 3) Skw RatO, I..G ..1000 10V/lis Settling Time (any 10V stOp to within 10mV of Final Value) G-I 711 G= 10 511S G. 100 lOlls G.lOOO 35l1s DifforcntiaJ Overload Recovery (130V Input to within 10mV of Final Value) (NatO 4) G - 1000 SOliS Common Mode StOp Recovery (30V Input to within 10mV of Final Value) (NatO 5) G =1000 lOllS VOLTAGE OFFSET (may be nulled) 3mV max (2mV typ) l.Omv max (0.5mV typ) Input Offset Voltage (Vas,) l.5mV max (0.5mV ryp) vs. Temporature 2IIV/.C max 1511VtC max (7I1VtC typ) 511VtC max (l.5I1Vfc typ) . vs. Supply 311V/% lOOmV max Output Offset Voltage (Vaso) 4OOmV max (200mV typ) 200mV max (30mV typ) vs. Temporature 7511VtCmax 150llVfc max (50IlV :C typ) 4OOIIVtCmax (l50IlV :C typ) vs. Supply (Narc 6) 0.005VOSO/% INPUT CURRENTS 80nA max Input Bias Current (either input) 4OnA max vs. Temporature InAtC max 500pAfC max . vs. Supply 2 %IV 20nA max Input Offser Current 10nA max vs. Temporature 250pAtC max 125pAtC max INPUT Differential Input Impodance (NatO 7) 3 x 1O911111.8pF Common Mode Input Impedance (NatO 8) 6 x lO O11113.0pF Input Voltage Range for Specified Poriorrnance tlOV (with rospect to ground) Maximum Voltage without Damage to Unit, Power ON or OFF Differential Mode (Note 9) 30V Voltage at either input (Narc 9) Vs tl5V Common Mode Rejection Ratio, DC to 60Hz with IH1 source unbalance Gol 70dB min (74dB typ) 74dB min (80dB typ) GolO 90dB min (94dB typ) 94dB min (lOOdB typ) GolOO lOOdB min (l04dB typ) 1O4dB min (l14dB typ) G . 1000 lOOdB min (lIOdB typ) - llOdB min (l20dB trP,) NOISE Voltage RTO (p-p) O.IHz to 10Hz (Narc 10) RMS RTO, 10Hz to 10kHz Input Current, rms, 10Hz to 10kHz - REFERENCE TERMINAL Bias Current 311A Input Resistance IOM11 Voltage Range tlOV Gain to Output I - POWER SUPPLY t5V to U8V Oporati ll Voltage Ra..e SmA max Quincent Supply Current - TEMPERATURE RANGE Spooned Performance 0 to +70.C -55.Cto+125.C Oporating -25.C to +85.C -55.C to +125.C Storage -65.C to +150.C -- Specificatiom AD521JD. ooSpec:if ocatioaa AD5Z1KD. Specificatioaaoubjoct10< wit< without DOO. REV.A ~ --- -- - --------