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a FEATURES Enhanced Replacement for LF441 and TL061 DC Performance: 200 ␮A max Quiescent Current 10 pA max Bias Current, Warmed Up (AD548C) 250 ␮V max Offset Voltage (AD548C) 2 ␮V/؇C max Drift (AD548C) 2 ␮V p Noise, 0.1 Hz to 10 Hz AC Performance: 1.8 V/␮s Slew Rate 1 MHz Unity Gain Bandwidth Available in Plastic, Hermetic Cerdip and Hermetic Metal Can Packages and in Chip Form Available in Tape and Reel in Accordance with EIA-481A Standard MIL-STD-883B Parts Available Dual Version Available: AD648 Surface Mount (SOIC) Package Available PRODUCT DESCRIPTION

The AD548 is a low power, precision monolithic operational amplifier. It offers both low bias current (10 pA max, warmed up) and low quiescent current (200 µA max) and is fabricated with ion-implanted FET and laser wafer trimming technologies. Input bias current is guaranteed over the AD548’s entire common-mode voltage range. The economical J grade has a maximum guaranteed input offset voltage of less than 2 mV and an input offset voltage drift of less than 20 µV/°C. The C grade reduces input offset voltage to less than 0.25 mV and offset voltage drift to less than 2 µV/°C. This level of dc precision is achieved utilizing Analog’s laser wafer drift trimming process. The combination of low quiescent current and low offset voltage drift minimizes changes in input offset voltage due to self-heating effects. Four additional grades are offered over the commercial, industrial and military temperature ranges. The AD548 is recommended for any dual supply op amp application requiring low power and excellent dc and ac performance. In applications such as battery-powered, precision instrument front ends and CMOS DAC buffers, the AD548’s excellent combination of low input offset voltage and drift, low bias current and low 1/f noise reduces output errors. High common-mode rejection (86 dB, min on the “C” grade) and high open-loop gain ensures better than 12-bit linearity in high impedance, buffer applications. The AD548 is pinned out in a standard op amp configuration and is available in six performance grades. The AD548J and AD548K are rated over the commercial temperature range of 0°C to +70°C. The AD548A, AD548B and AD548C are rated

Precision, Low Power BiFET Op Amp AD548 CONNECTION DIAGRAMS Plastic Mini-DIP (N) Package, Cerdip (Q) Package and SOIC (R)Package

OFFSET NULL 1

8 NC

INVERTING 2 INPUT NONINVERTING 3 INPUT V– 4

7 V+ 6 OUTPUT 5 OFFSET NULL

AD548 TOP VIEW

10kΩ

TO-99 (H) Package

4

NC OFFSET NULL

AD548

V+

6

3

TOP VIEW

7

INVERTING 2 INPUT

NONINVERTING INPUT

–15V

VOS TRIM

8 1

5

1

5 4

OUTPUT

OFFSET NULL

V–

NOTE : PIN 4 CONNECTED TO CASE NC = NO CONNECT

over the industrial temperature range of –40°C to +85°C. The AD548S is rated over the military temperature range of –55°C to +125°C and is available processed to MIL-STD-883B, Rev. C. The AD548 is available in an 8-pin plastic mini-DIP, cerdip, TO-99 metal can, surface mount (SOIC), or in chip form. PRODUCT HIGHLIGHTS

1. A combination of low supply current, excellent dc and ac performance and low drift makes the AD548 the ideal op amp for high performance, low power applications. 2. The AD548 is pin compatible with industry standard op amps such as the LF441, TL061, and AD542, enabling designers to improve performance while achieving a reduction in power dissipation of up to 85%. 3. Guaranteed low input offset voltage (2 mV max) and drift (20 µV/°C max) for the AD548J are achieved utilizing Analog Devices’ laser drift trimming technology, eliminating the need for external trimming. 4. Analog Devices specifies each device in the warmed-up condition, insuring that the device will meet its published specifications in actual use. 5. A dual version, the AD648 is also available. 6. Enhanced replacement for LF441 and TL061.

REV. B 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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703


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