AD644 AD | Alldatasheet
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NOTE: PIN 4 CONNECTED TO CASE AMPLIFIER NO. 1 AMPLIFIER NO. 2 REV. A 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 implication or otherwise under any patent or patent rights of Analog Devices. a Dual High Speed, Implanted BiFET Op Amp AD644 Tel: 617/329-4700 Fax: 617/326-8703
FEATURES
Matched Offset Voltage Over Temperature Matched Bias Currents Crosstalk –124 dB at 1 kHz Low Bias Current: 35 pA max Warmed Up Low Offset Voltage: 500 mV max Low Input Voltage Noise: 2 mV p-p High Slew Rate: 13 V/ ms Low Quiescent Current: 4.5 mA max Fast Settling to 60.01%: 3 ms Low Total Harmonic Distortion: 0.0015% at 1 kHz Standard Dual Amplifier Pinout Available in Hermetic Metal Can Package and Chip Form MIL-STD-883B Processing Available Single Version Available: AD544 PRODUCT DESCRIPTION The AD644 is a pair of matched high speed monolithic FET in- put operational amplifiers fabricated with the most advanced bi- polar, JFET and laser-trimming technologies. The AD644 offers matched bias currents that are significantly lower than currently available monolithic dual BiFET operational amplifiers: 35 pA max, matched to 25 pA for the AD644K and L, 75 pA max matched to 35 pA for the AD644J and S. In addition, the offset voltage is laser trimmed to less than 0.5 mV, and matched to 0.25 mV for the AD644L, 1.0 mV and matched to 0.5 mV for the AD644K, utilizing Analog Devices’ laser-wafer trimming (LWT) process. The tight matching and temperature tracking between the op- erational amplifiers is achieved by ion-implanted JFETs and laser-wafer trimming. Ion-implantation permits the fabrication of precision, matched JFETs on a monolithic bipolar chip. This process optimizes the ability to produce matched amplifiers which have lower initial bias currents than other popular BiFET op amps. Laser-wafer trimming each amplifier’s input offset voltage assures tight initial match and superior IC processing guarantees offset voltage tracking over the temperature range. The AD644 is recommended for applications in which both excellent ac and dc performance is required. The matched am- plifiers provide a low cost solution to true wideband instrumen- tation amplifiers, low dc drift active filters and output amplifiers for four quadrant multiplying D/A converters such as the AD7541, 12-bit CMOS DAC. The AD644 is available in four versions: the “J”, “K” and “L” are specified over the 0 °C to +70°C temperature range and the “S” over the –55°C to +125°C operating temperature range. All devices are packaged in the hermetically sealed, TO-99 metal can or available in chip form. PRODUCT HIGHLIGHTS 1. The AD644 has tight side to side matching specifications to ensure high performance without matching individual devices. 2. Analog Devices, unlike some manufacturers, specifies each device for the maximum bias current at either input in the warmed-up condition, thus assuring the user that the AD644 will meet its published specifications in actual use. 3. Laser-wafer-trimming reduces offset voltage to as low as 0.5 mV max matched side to side to 0.25 mV (AD644L), thus eliminating the need for external nulling. 4. Improved bipolar and JFET processing on the AD644 result in the lowest matched bias current available in a high speed monolithic FET op amp. 5. Low voltage noise (2 µV p-p) and high open loop gain enhance the AD644’s performance as a precision op amp. 6. The high slew rate (13.0 V/ µs) and fast settling time to 0.01% (3.0 µs) make the AD644 ideal for D/A, A/D, sample- hold circuits and dual high speed integrators. 7. Low harmonic distortion (0.0015%) and low crosstalk (–124 dB) make the AD644 an ideal choice for stereo audio applications. 8. The standard dual amplifier pin out allows the AD644 to replace lower performance duals without redesign. 9. The AD644 is available in chip form.
AD644–SPECIFICATIONS(@ +258C and VS = 615 V dc) Model AD644J AD644K AD644L AD644S Min Typ Max Min Typ Max Min Typ Max Min Typ Max Units OPEN LOOP GAIN VO = ± 10 V, RL ≥ 2 kΩ 30,000 50,000 50,000 50,000 V/V TMIN to TMAX, RL = 2 kΩ 20,000 40,000 40,000 20,000 V/V OUTPUT CHARACTERISTICS Voltage @ R L = 2 kΩ , TMIN to TMAX 610 ± 12 610 ± 12 610 ± 12 610 ± 12 V Voltage @ R L = 10 kΩ , TMIN to TMAX 612 ± 13 612 ± 13 612 ± 13 612 ± 13 V Short Circuit Current 25 25 25 25 mA FREQUENCY RESPONSE Unity Gain Small Signal 2.0 2.0 2.0 2.0 MHz Full Power Response 200 200 200 200 kHz Total Harmonic Distortion 0.0015 0.0015 0.0015 0.0015 % INPUT OFFSET VOLTAGE 1 Initial Offset 2.0 1.0 0.5 1.0 mV Input Offset Voltage T MIN to TMAX 3.5 2.0 1.0 3.5 mV Input Offset Voltage vs. Supply, TMIN to TMAX 200 100 100 100 µV/V INPUT BIAS CURRENT 2 Either Input 10 75 10 35 10 35 10 35 pA Offset Current 10 5 5 5 pA MATCHING CHARACTERISTICS 3 Input Offset Voltage 1.0 0.5 0.25 0.5 mV Input Offset Voltage T MIN to TMAX 3.5 2.0 1.0 3.5 mV Input Bias Current 35 25 25 35 pA Crosstalk –124 –124 –124 –124 dB INPUT IMPEDANCE Differential 10 12i61 0 12i61 0 12i61 0 12i6M Ω ipF Common Mode 10 12i31 0 12i31 0 12i31 0 12i3M Ω ipF INPUT VOLTAGE RANGE Differential 4 ± 20 ± 20 ± 20 ± 20 V Common Mode ± 10 ± 12 ± 10 ± 12 ± 10 ± 12 ± 10 ± 12 V Common-Mode Rejection 76 80 80 80 dB INPUT NOISE Voltage 0.1 Hz to 10 Hz 2222 µV p-p f = 10 Hz 35 35 35 35 nV/ √Hz f = 100 Hz 22 22 22 22 nV/ √Hz f = 1 kHz 18 18 18 18 nV/ √Hz f = 10 kHz 16 16 16 16 nV/ √Hz POWER SUPPLY Rated Performance ± 15 ± 15 ± 15 ± 15 V Operating ± 5 ± 18 ± 5 ± 18 ± 5 ± 18 ± 5 ± 18 V TEMPERATURE RANGE Operating, Rated Performance 0 +70 0 +70 0 +70 –55 +125 °C Storage –65 +150 –65 +150 –65 +150 –65 +150 °C PACKAGE OPTION TO-99 Style (H-08B) AD644JH AD644KH AD644LH AD644SH Chips AD644JChips AD644KChips AD644SChips NOTES 1Input Offset Voltage specifications are guaranteed after 5 minutes of operation at T A = +25°C. 2Bias Current specifications are guaranteed at maximum at either input after 5 minutes of operation at T A = +25°C. For higher temperatures, the current doubles every 10 °C. 3Matching is defined as the difference between parameters of the two amplifiers. 4Defined as voltage between inputs, such that neither exceeds ± 10 V from ground. Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min and max specifications are guaranteed, although only those shown in boldface are tested on all production units. Specifications subject to change without notice. METALIZATION PHOTOGRAPH Dimensions shown in inches and (mm). Contact factory for latest dimensions. REV. A–2–
Typical Characteristics–AD644 –3–REV. A
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