AD544 AD [Analog Devices], AD544 Datasheet

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AD544

Manufacturer Part Number
AD544
Description
High Performance, BiFET Operational Amplifiers
Manufacturer
AD [Analog Devices]
Datasheet

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PRODUCT DESCRIPTION
The BiFET series of precision, monolithic FET-input op amps
are fabricated with the most advanced BiFET and laser trim-
ming technologies. The AD542, AD544, AD547 series offers
bias currents significantly lower than currently available BiFET
devices, 25 pA max, warmed up.
In addition, the offset voltage is laser trimmed to less than
0.25 mV on the AD547L, which is achieved by utilizing Analog
Devices’ exclusive laser wafer trimming (LWT) process. When
combined with the AD547’s low offset drift (1 V/ C), these
features offer the user performance superior to existing BiFET
op amps at low BiFET pricing.
The AD542 or AD547 is recommended for any operational am-
plifier application requiring excellent dc performance at low to
moderate cost. Precision instrument front ends requiring accu-
rate amplification of millivolt level signals from megohm source
impedances will benefit from the device’s excellent combination
of low offset voltage and drift, low bias current and low 1/f
noise. High common-mode rejection (80 dB, min on the “K”
and “L” grades) and high open-loop gain, even under heavy
loading, ensures better than “12-bit” linearity in high imped-
ance buffer applications.
The AD544 is recommended for any op amp applications re-
quiring excellent ac and dc performance at low cost. The
2 MHz bandwidth and low offset of the AD544 make it the first
choice as an output amplifier for current output D/A converters,
such as the AD7541, 12-bit CMOS DAC.
Devices in this series are available in four grades: the “J,” “K,”
and “L” grades are specified over the 0 C to +70 C temperature
range and the “S” grade over the –55 C to +125 C operating
temperature range. All devices are offered in the hermetically
sealed, TO-99 metal can package.
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.
FEATURES
Ultralow Drift: 1 V/ C (AD547L)
Low Offset Voltage: 0.25 mV (AD547L)
Low Input Bias Currents: 25 pA max
Low Quiescent Current: 1.5 mA
Low Noise: 2 V p-p
High Open Loop Gain: 110 dB
High Slew Rate: 13 V/ s
Fast Settling to
Low Total Harmonic Distortion: 0.0025%
Available in Hermetic Metal Can and Die Form
MIL-STD-883B Versions Available
Dual Versions Available: AD642, AD644, AD647
0.01%: 3 s
PRODUCT HIGHLIGHTS
1. Improved bipolar and JFET processing results in the lowest
2. Analog Devices, unlike some manufacturers, specifies each
3. Advanced laser wafer trimming techniques reduce offset volt-
4. Low voltage noise (2 V p-p) and low offset voltage drift en-
5. High slew rate (13 V/ s) and fast settling time to 0.01% (3 s)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
6. Low harmonic distortion (0.0025%) make the AD544 an
7. Bare die are available for use in hybrid circuit applications.
bias current available in a monolithic FET op amp.
device for the maximum bias current at either input in the
warmed-up condition, thus assuring the user that the device
will meet its published specifications in actual use.
age drift to 1 V/ C max and offset voltage to only 0.25 mV
max on the AD547L.
hance performance as a precision op amp.
make the AD544 ideal for D/A, A/D, sample-hold circuits
and high speed integrators.
ideal choice in audio applications.
BiFET Operational Amplifiers
NONINVERTING
INVERTING
CONNECTION DIAGRAM
AD542/AD544/AD547
INPUT
INPUT
NULL
NOTE: PIN 4 CONNECTED TO CASE
High Performance,
2
1
3
TAB
–V
4
8
5
7
6
+V
NULL
OUTPUT
Fax: 617/326-8703

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AD544 Summary of contents

Page 1

... The AD544 is recommended for any op amp applications re- quiring excellent ac and dc performance at low cost. The 2 MHz bandwidth and low offset of the AD544 make it the first choice as an output amplifier for current output D/A converters, such as the AD7541, 12-bit CMOS DAC. ...

Page 2

... Either Input J Grade Grades Input Offset Current J Grade Grades INPUT IMPEDANCE Differential Common Mode 5 INPUT VOLTAGE Differential Common Mode Common-Mode Rejection Grade Grades AD542 AD544 Min Typ Max Min Typ 100 30 250 50 100 20 100 20 250 ...

Page 3

... AD542JH 2.0 mV AD542KH 1.0 mV AD542LH 0.5 mV AD542SH 1.0 mV AD542SH/883B 1.0 mV AD544JH 2.0 mV AD544KH 1.0 mV AD544LH 0.5 mV AD544SH 1.0 mV AD544SH/883B 1.0 mV AD547JH 1.0 mV AD547KH 0.5 mV AD547LH 0.25 mV AD547SCHIPS 0.5 mV AD547SH/883B 0.5 mV REV. B AD542 AD544 Min Typ Max Min Typ 1.1 1.5 1.8 2.0 2.0 2 +70 –55 to +125 –55 to +125 –65 to +150 –65 to +150 +25 C ...

Page 4

... AD542/AD544/AD547–Typical Characteristics Figure 1. Input Voltage Range vs. Supply Voltage Figure 4. Input Bias Current vs. Supply Voltage Figure 7. Change in Offset Voltage vs. Warm-Up Time Figure 2. Output Voltage Swing vs. Supply Voltage Figure 5. Input Bias Current vs. Temperature Figure 8. Open Loop Gain vs. Temperature –4– Figure 3. Output Voltage Swing vs. ...

Page 5

... Distortion vs. Frequency REV. B Figure 11. Power Supply Rejection vs. Frequency Figure 14. Large Signal Frequency Response Figure 17. Input Noise Voltage Spectral Density –5– AD542/AD544/AD547 Figure 12. Common-Mode Rejection Ratio vs. Frequency Figure 15. AD544 Output Swing and Error vs. Settling Time Figure 18. Total RMS Noise vs. Source Resistance ...

Page 6

... AD542/AD544/AD547 a. Unity Gain Follower Figure 19. THD Test Circuits Figure 21a. Unity Gain Follower Pulse Response (Large Signal) Figure 22a. Unity Gain Inverter AD542/AD547 b. Follower with Gain = 10 Figure 21b. Unity Gain Follower Pulse Response (Small Signal) Figure 22b. Unity Gain Inverter Pulse Response (Large Signal) – ...

Page 7

... Figure 25. Settling Time Test Circuit The upper trace of the oscilloscope photograph of Figure 26 shows the settling characteristic of the AD544. The lower trace represents the input to Figure 27. The AD544 has been designed for fast settling to 0.01%, however, feedback components, cir- cuit layout and circuit design must be carefully considered to obtain optimum settling time. Figure 26. Settling Characteristic Detail– ...

Page 8

... AD542/AD544/AD547 BiFET Application Hints APPLICATION NOTES The BiFET series was designed for high performance op amp applications that require true dc precision. To capitalize on all of the performance available from the BiFETs there are some practical error sources that should be considered. The bias currents of JFET input amplifiers double with every 10 C increase in chip temperature ...

Page 9

... V analog input, the circuit can perform a 4-quadrant multiplying function. Figure 32a. AD544 Used as DAC Output Amplifiers The photos exhibit the response to a step input at V 32b is the large signal response and Figure 32c is the small sig- nal response ...

Page 10

... AD542/AD544/AD547 This particular log ratio circuit is free from the dynamic prob- lems that plague many other log circuits. The –3 dB bandwidth is 50 kHz over the top 3 decades, 100 nA to 100 A, and de- creases smoothly at lower input levels. This circuit needs no ad- ditional frequency compensation for stable operation from input current sources, such as photodiodes, that may have 100 pF of shunt capacitance ...

Page 11

... REV. B OUTLINE DIMENSIONS Dimensions shown in inches and (mm). TO-99 (H-08A) –11– AD542/AD544/AD547 ...

Page 12

–12– ...

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