AD548AH ,Precision, Low Power BiFET Op AmpFEATURESPlastic Mini-DIP (N) Package,Enhanced Replacement for LF441 and TL061Cerdip (Q) Package and ..
AD548AQ ,Precision, Low Power BiFET Op AmpSPECIFICATIONS SModel AD548J/A/S AD548K/B ..
AD548BR ,Precision, Low Power BiFET Op AmpSPECIFICATIONS SModel AD548J/A/S AD548K/B ..
AD548CQ ,Precision, Low Power BiFET Op AmpCharacteristics20 2030+VOUT2515 1520+VIN–VOUT10 10 1525°C–VINR = 10kL 105550 000 5 ..
AD548J ,Precision, Low Power BiFET Op AmpFEATURESPlastic Mini-DIP (N) Package,Enhanced Replacement for LF441 and TL061Cerdip (Q) Package and ..
AD548JN ,Precision, Low Power BiFET Op AmpCharacteristics20 2030+VOUT2515 1520+VIN–VOUT10 10 1525°C–VINR = 10kL 105550 000 5 ..
AD9600ABCPZ-150 , 10-Bit, 105 MSPS/125 MSPS/150 MSPS
AD9601BCPZ-250 , 10-Bit, 200 MSPS/250 MSPS 1.8 V Analog-to-Digital Converter
AD9610BH ,Wide Bandwidth, Fast Settling Operational Amplifierspecifications.A0961 ll --SPEtyFltlfrlas
DC ELECTRICAL tNNtlitTEMmtSi:o,., 115%: --1lc=1litBn;itr= ..
AD9617JN ,Low Distortion, Precision, Wide Bandwidth Op AmpSPECIFICATIONS1NOTESABSOLUTE MAXIMUM RATINGS1Absolute maximum ratings are limiting values to be app ..
AD9617JR ,Low Distortion, Precision, Wide Bandwidth Op AmpCHARACTERISTICS(Unless otherwise noted, A = +3; 6V = 65 V; R = 400 V; R = 100 V)V S F LOADTest AD96 ..
AD9618AQ ,Low Distortion, Precision, Wide Bandwidth Op AmpSPECIFICATIONS IS BASED ON SUPPLY CON-
NECTIONS TO THESE PINS.
"OPTIONAL -Vs
The AD9618] ope ..
AD548AH-AD548AQ-AD548BR-AD548CQ-AD548J-AD548JN-AD548JR-AD548KN
Precision, Low Power BiFET Op Amp
Precision, Low Power
BiFET Op AmpREV.B
FEATURES
Enhanced Replacement for LF441 and TL061
DC Performance:
200 mA max Quiescent Current
10 pA max Bias Current, Warmed Up (AD548C)
250 mV max Offset Voltage (AD548C)
2 mV/8C max Drift (AD548C)
2 mV p-p Noise, 0.1 Hz to 10 Hz
AC Performance:
1.8 V/ms 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 DESCRIPTIONThe 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 cur-
rent and low offset voltage drift minimizes changes in input off-
set 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 appli-
cation requiring low power and excellent dc and ac perfor-
mance. 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 com-
mon-mode rejection (86 dB, min on the “C” grade) and high
open-loop gain ensures better than 12-bit linearity in high im-
pedance, 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
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 HIGHLIGHTSA 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.The AD548 is pin compatible with industry standard op
amps such as the LF441, TL061, and AD542, enabling de-
signers to improve performance while achieving a reduction
in power dissipation of up to 85%.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.Analog Devices specifies each device in the warmed-up con-
dition, insuring that the device will meet its published specifi-
cations in actual use.A dual version, the AD648 is also available.Enhanced replacement for LF441 and TL061.
CONNECTION DIAGRAMS
Plastic Mini-DIP (N) Package,
Cerdip (Q) Package and
AD548
OFFSET NULL
OUTPUT
OFFSET
NULLNONINVERTING
INPUT1V+
NOTE : PIN 4 CONNECTED TO CASE
NC = NO CONNECT
INVERTING
INPUTAD548
OFFSET NULL
OUTPUT
INVERTING
INPUTOFFSET
NULLTOP VIEW
NONINVERTING
INPUT
VOS TRIM
TOP VIEW
–15V
10kΩ
TO-99 (H) Package
AD548–SPECIFICATIONS
(@ +258C and VS = 615V dc unless otherwise noted)
COMMON-MODE VOLTAGE – V
INPUT BIAS CURRENT – pA
–10 –6 –2 2 6 10Figure 7.Input Bias Current vs.
Common-Mode Voltage
FREQUENCY – Hz
1k 10k 100k 1M 10M
PHASE IN DEGREES
OPEN LOOP GAIN – dB
FREQUENCY – Hz
1k 10k 100k 1MFigure 13.CMRR vs. Frequency
TOTAL HARMONIC DISTORTION – %
AD548–Typical Characteristics
WARM-UP TIME – Seconds0 10 20 30 40 50 60 70I –
Figure 8.Change in Offset Voltage
vs. Warm-Up Time
SUPPLY VOLTAGE – ±V
OPEN LOOP VOLTAGE GAIN – dB
0 2 4 6 8 10 12 14 16 18
110Figure 11.Open Loop Voltage Gain
vs. Supply Voltage
OUTPUT VOLTAGE – V p-p
FREQUENCY – Hz
10 100 1k 10k 100k 1MFigure 14.Large Signal Frequency
Response
INPUT NOISE VOLTAGE – nV/
AD548
Figure 22.Board Layout for Guarding Inputs
INPUT PROTECTION
The AD548 is guaranteed to withstand input voltages equal to
the power supply potential. Exceeding the negative supply volt-
age on either input will forward bias the substrate junction of
the chip. The induced current may destroy the amplifier due to
excess heat.
Input protection is required in applications such as a flame
detector in a gas chromatograph, where a very high potential
may be applied to the input terminals during a sensor fault con-
dition. Figure 23 shows a simple current limiting scheme that
can be used. RPROTECT should be chosen such that the maxi-
mum overload current is 1.0 mA (l00 kΩ for a 100 V overload,
for example).
Exceeding the negative common-mode range on either input
terminal causes a phase reversal at the output, forcing the
amplifier output to the corresponding high or low state. Exceed-
ing the negative common-mode on both inputs simultaneously
forces the output high. Exceeding the positive common-mode
range on a single input doesn’t cause a phase reversal, but if
both inputs exceed the limit the output will be forced high. In
all cases, normal amplifier operation is resumed when input
voltages are brought back within the common-mode range.
Figure 23.Input Protection of IV Converter
D/A CONVERTER OUTPUT BUFFER
The circuit in Figure 24 shows the AD548 and AD7545 12-bit
CMOS D/A converter in a unipolar binary configuration. VOUT
will be equal to VREF attenuated by a factor depending on the
digital word. VREF sets the full scale. Overall gain is trimmed by
adjusting RIN. The AD548’s low input offset voltage, low drift
and clean dynamics make it an attractive low power output
Figure 24.AD548 Used as DAC Output Amplifier
That is:
VOSOutput=VOSInput1+RFB
RFB is the feedback resistor for the op amp, which is internal to
the DAC. RO is the DAC’s R-2R ladder output resistance. The
value of RO is code dependent. This has the effect of changing
the offset error voltage at the amplifier’s output. An output am-
plifier with a sub millivolt input offset voltage is needed to
preserve the linearity of the DAC’s transfer function.
The AD548 in this configuration provides a 700 kHz small sig-
nal bandwidth and 1.8 V/μs typical slew rate. The 33 pF capaci-
tor across the feedback resistor optimizes the circuit’s response.
The oscilloscope photos in Figures 25 and 26 show small and
large signal outputs of the circuit in Figure 24. Upper traces
show the input signal VIN. Lower traces are the resulting output
voltage with the DAC’s digital input set to all 1s. The AD548
settles to ±0.01% for a 20 V input step in 14 μs.
Figure 25.Response to ±20 V p-p Reference Square Wave
