Dual Precision, a Low Power BiFET Op Amp AD648 FEATURES CONNECTION DIAGRAM DC Performance Plastic Mini-Dip (N) Package, 400 A max Quiescent Current Plastic SOIC (R) Package 10 pA max Bias Current, Warmed Up (AD648B) 1 V max Offset Voltage (AD648B) and 10 V/ C max Drift (AD648B) CERDIP (Q) Package 2 V p-p Noise, 0.1 Hz to 10 Hz AC Performance 1.8 V/ s Slew Rate 1 MHz Unity Gain Bandwidth Available in Plastic Mini-DIP, CERDIP, and Plastic SOIC Packages MIL-STD-883B Parts Available Surface Mount (SOIC) Package Available in Tape and Reel in Accordance with EIA-481A Standard Single Version: AD548 PRODUCT DESCRIPTION 55C to +125C and the AD648T* grade is available pro- The AD648 is a matched pair of low power, precision mono- cessed to MIL-STD-883B, Rev. C. lithic operational amplifiers. It offers both low bias current The AD648 is available in an 8-lead plastic mini-DIP, (10 pA max, warmed up) and low quiescent current (400 A CERDIP, and SOIC. max) and is fabricated with ion-implanted FET and laser wafer *Not for new design, obsolete April 2002. trimming technologies. Input bias current is guaranteed over the AD648s entire common-mode voltage range. PRODUCT HIGHLIGHTS The economical J grade has a maximum guaranteed offset 1. A combination of low supply current, excellent dc and ac voltage of less than 2 mV and an offset voltage drift of less than performance and low drift makes the AD648 the ideal op 20 V/C. This level of dc precision is achieved using Analogs amp for high performance, low power applications. laser wafer drift trimming process. The combination of low 2. The AD648 is pin compatible with industry standard dual quiescent current and low offset voltage drift minimizes changes op amps such as the LF442, TL062, and AD642, enabling in input offset voltage due to self-heating effects. Five grades are designers to improve performance while achieving a reduc- offered over the commercial, industrial and military temperature tion in power dissipation of up to 85%. ranges. 3. Guaranteed low input offset voltage (2 mV max) and drift The AD648 is recommended for any dual supply op amp (20 V/C max) for the AD648J are achieved using Analog application requiring low power and excellent dc and ac per- Devices laser drift trimming technology. formance. In applications such as battery-powered, precision instrument front ends and CMOS DAC buffers, the AD648s 4. Analog Devices specifies each device in the warmed-up excellent combination of low input offset voltage and drift, low condition, insuring that the device will meet its published bias current, and low 1/f noise reduces output errors. High specifications in actual use. common-mode rejection (82 dB, min on the B grade) and 5. Matching characteristics are excellent for all grades. The high open-loop gain ensures better than 12-bit linearity in high input offset voltage matching between amplifiers in the impedance, buffer applications. AD648J is within 2 mV. The AD648 is pinned out in a standard dual op amp configura- 6. Crosstalk between amplifiers is less than 120 dB at 1 kHz. tion and is available in seven performance grades. The AD648J and AD648K are rated over the commercial temperature range of 0C to 70C. The AD648 and AD648B are rated over the industrial temperature range of 40C to +85C. The AD648S and AD648T are rated over the military temperature range of REV. E Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise Tel: 781/329-4700 www.analog.com under any patent or patent rights of Analog Devices. Fax: 781/326-8703 Analog Devices, Inc., 2002( + 25 C and V = 15 V dc, unless otherwise noted.) AD648SPECIFICATIONS S AD648J/A/S AD648K/B/T Model Min Typ Max Min Typ Max Unit 1 INPUT OFFSET VOLTAGE Initial Offset 0.75 2.0 0.3 1.0 T to T 3.0/3.0/3.0 1.5/1.5/2.0 mV MIN MAX vs. Temperature 20 10 V/C vs. Supply 80 86 dB vs. Supply, T to T 76/76/76 80 dB MIN MAX Long-Term Offset Stability 15 15 V/month INPUT BIAS CURREN 2 Either Input, V = 0 5 20 3 10 pA CM 2 Either Input at T , V = 0 0.45/1.3/20 0.25/0.65/10 nA MAX CM Max Input Bias Current Over Common-Mode Voltage Range 30 15 pA Offset Current, V = 0 5 10 2 5 pA CM Offset Current at T 0.25/0.7/10 0.15/0.35/5 nA MAX 3 MATCHING CHARACTERISTICS Input Offset Voltage 1.0 2.0 0.5 1.0 mV Input Offset Voltage T to T 3.0/3.0/3.0 1.5/1.5/2.0 mV MIN MAX Input Offset Voltage vs. Temperature 8 5 V/C Input Bias Current 10 5 pA Crosstalk 120 120 dB INPUT IMPEDANCE 1 2 12 Differential 1 10 3 1 10 3 pF 12 12 Common Mode 3 10 3 3 10 3 pF INPUT VOLTAGE RANGE 4 Differential 20 20 V Common Mode 11 12 11 12 V Common-Mode Rejection V = 10 V 76 82 dB CM T to T 76/76/76 82 dB MIN MAX V = 11 V 70 76 dB CM T to T 70/70/70 76 dB MIN MAX INPUT VOLTAGE NOISE Voltage 0.1 Hz to 10 Hz 2 2 V p-p f = 10 Hz 80 80 nV/Hz f = 100 Hz 40 40 nV/Hz f = 1 kHz 30 30 nV/Hz f = 10 kHz 30 30 nV/Hz INPUT CURRENT NOISE f = 1 kHz 1.8 1.8 fA/Hz FREQUENCY RESPONSE Unity Gain, Small Signal 0.8 1.0 0.8 1.0 MHz Full Power Response 30 30 kHz Slew Rate, Unity Gain 1.0 1.8 1.0 1.8 V/s Settling Time to 0.01% 8 8 s OPEN-LOOP GAIN V = 10 V, R 10 k 300 1000 300 1000 V/mV O L T to T , R 10 k 300/300/300 700 300 700 V/mV MIN MAX L V = 10 V, R 5 k 150 500 150 500 V/mV O L T to T , R 5 k 150/150/150 300 150 300 V/mV MIN MAX L REV. 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