UPDATE.AUG–RP Product Update: High-performance op amps
Here is a sampling of recently introduced amplifiers and buffers offering
above-average performance Amp is optimized for high-speed use
The OPA622 is a monolithic amplifier component optimized for precision
widebandwidth systems. The device combines a monolithic integrated
current-feedback amplifier block with an internal independent buffer amp
to create a voltage-feedback op amp. Specifications include a 200-MHz
large-signal bandwidth at 5-Vp-p output swing, a 1,700-V/μs slew rate,
and a 78-dB common-mode rejection ratio. In addition, the OPA622 has a 0.
1-microamp input offset current, and differential gain and phase errors of
0.15% and 0.08 degrees, respectively. The amp uses 5 mA of quiescent
current from a +/-5-V supply, and comes in 14-pin plastic DIPs and SO
packages. (From $7.10 ea/100-stock.) Burr-Brown Corp., Tucson, AZ Bonnie
Baker 800-548-6132 Fax 602-889-1510 Variable-gain
amp offers wide bandwidth
The CLC522 variable-gain amplifier (VGA) is a dc-coupled two-quadrant
multiplier with differential voltage inputs and a single-ended voltage
output. The device is a complete VGA system incorporating two input
buffers and an output op amp integrated with the multiplier core. The
CLC522's maximum gain can be set using two external resistors over a
nominal range of 2 to 100 V/V with the gain control input providing a
40-dB gain range down from the maximum setting. At a maximum gain of 10
V/V, signal channel and gain-control channel bandwidth are 165 MHz. Gain
control nonlinearity over the 40-dB range is 0.5% and absolute gain
accuracy at 10 V/V is +/-0.3%. The CLC522 is available in 14-pin DIPs and
SOPs. ($9.26 ea/1,000– –available now.) Comlinear Corp., Fort Collins,
CO Tom Baldwin 303-226-0500 Fax 303-226-0564
Video op amps offer gain-of-2 stability
The EL2045/2245/2445 are, respectively, single, dual, and quad high-speed
low-power monolithic video op amps. At a gain of +2 the devices have a
-3-dB bandwidth of 100 MHz with a phase margin of 50 degrees. The
EL2045/2245/2445 can drive unlimited load capacitance and are designed
with voltage-feedback topologies. The EL2045 is available in 8-pin plastic
DIPs and SO packages. (From $1.80 ea/100– –available now.) Elantec,
Inc., Milpitas, CA Pat Mayer 408-945-1323, ext. 303
Op amps combine precision, low power
The MAX478/479 are dual/quad precision micropower op amps. The devices
combine precision with extremely low supply currents– –less than 17
microamps per amplifier. In addition, input offset voltage is 30
microvolts typ, offset voltage drift is 2.3 microvolts/ degreesC max,
input bias current is 5 nA max, and input offset current is 250 pA max.
Both products can operate from a single lithium cell or two NiCd cells,
and their input-voltage ranges include ground. Other specifications
include 0.9 microvoltsp-p voltage noise, 1.5 pAp-p current noise, and an
85-kHz gain-bandwidth product. The MAX478 comes in 8-pin DIPs and SOPs; the
MAX479 comes in 14-pin DIPs and narrow SOPs. (MAX478, from $2.20 ea/1,000;
MAX479, from $3.25 ea/1,000– –available now.) Maxim Integrated
Products Sunnyvale, CA Customer Service 408-737-7600, ext. 6087 EEM
FILE 3130
45-MHz op amps come in SO packages
The LT1208/1209 are dual/quad very- high-speed op amps that feature
reduced input offset voltage and higher dc gain than devices with
comparable bandwidth and slew rate. The devices have a 45-MHz
gain-bandwidth product, a 400-V/μs slew rate, and a settling time of 90
ns for a 10-V step to 0.1% of final value. dc performance of the op amps
includes a 2-mV maximum input offset voltage and a minimum open-loop gain
of 70 dB into a 500-ohm load. Each output is capable of driving a 500-ohm
load to +/-12 V with +/-15-V supplies and a 150-ohm load to +/-3 V on
+/-5-V supplies. The LT1208 is available in 8-pin DIPs and SOPs; the
LT1209 is available in 14-pin DIPs and 16-pin SOPs. (LT1208, from $4.45
ea/100; LT1209, from $6.90 ea/1,000– –available now.) Linear Technology
Corp. Milpitas, CA Bob Scott 408-432-1900 Fax 408-434-0507
3130
100-MHz buffers provide improved performance
A direct pin-for-pin replacement for the National Semiconductor LM6121
buffer series offers improved performance. The LM6121 is a general-purpose
monolithic unity-gain buffer that has a 100-MHz bandwidth, a 1,200-V/μs
slew rate, and a 7-ns rise/fall time. The LM6121 series is capable of
delivering +/-230 mA to a resistive load, and is oscillation free into
capacitive loads. The devices are available in 8-pin plastic DIPs, SOPs,
and hermetic 8-lead TO-5 packages. (From $1.57 ea/100– –samples from
stock; 4 to 6 weeks ARO.) Calogic Corp., Fremont, CA Brenda Hill
510-656-2900 Fax 510-651-3025
Hybrid power op amp comes in SIP
The PA87 is a hybrid high-voltage power MOSFET op amp available in a
single in-line package. The device is capable of operating from a +/-225-V
supply and can deliver 200 mA of continuous output current. The PA87 also
features a programmable current limit, external compensation, and a
quiescent current use of 3 mA. The op amp is available in 0.520 (W) x 1.
020 (L) x 0.22-in. (H) 10-pin SIPs. ($67.50 ea/100– –stock.) Apex
Microtechnology Corp. Tucson, AZ Marie Rivera 602-690-8603 Fax
602-888-3329
High-speed quad op amp uses low power
The OP-467 is a quad high-speed precision op amp that has a 28-MHz
bandwidth, a slew rate of 170 V/μs, and a settling time of less than
200 ns to 0.01%. In addition, the device is unity-gain stable and can
drive capacitive loads up to 1,600 pF. The OP-467 has an offset voltage
of less than 500 microvolts and draws less than 10 mA from +/-5 to +/-15-V
supplies. The device is available in 14-pin plastic DIPs and CerDIPs as
well as 16-lead SOL and 20-contact LCC packages. The op amp also comes in
die form. (Die version, $4.86 ea/1,000; plastic DIP, from $5.72 ea/1,000–
–available now.) Analog Devices, Inc. Norwood, MA Information
617-937-1428 Fax 617-821-4273
850-MHz buffer has programmable gain
The HFA1113 closed-loop current-feedback buffer provides a -3-dB
bandwidth of 850 MHz and a 2,050-V/μs slew rate. In addition, the
device has an 11-ns settling time to 0.1% and a gain flatness of 0.075 dB
at 200 MHz. The HFA1113 features a user-programmable output voltage clamp
that lets the designer set maximum positive and negative output levels to
protect devices in later signal-processing stages. The buffer also offers
user-programmable gain of +2, +1, and 1. The device is available in 8-pin
plastic and ceramic DIPs as well as SOPs. (From $5.95 ea/100– –available
now.) Harris Corp., Melbourne, FL Information 800-4-HARRIS, ext. 7090
Op amp combines high speed and low noise
The CLC425 voltage-feedback op amp combines a gain-bandwidth product of
1.7 GHz with an input voltage and current noise of 1.05 nV/
1.6 pA/
100-microvolt offset voltage, 2 microvolts/ degreesC of drift, and
closed-loop gains of +/-10 V/V. Other specifications include a 96-dB
open-loop gain, a 350-V/μs slew rate, and a common-mode rejection ratio
and power-supply rejection ratio of 100 and 95 dB, respectively. The amp
operates from +/-5-V supplies and defaults to 150 mW of quiescent power.
It is also equipped with an external supply current adjustment that
enables the amp to use less than 5 mA, where an 850 fA/
noise can be achieved. The CLC425 is available in 8-pin plastic DIPs,
CerDIPs, SO packages, and die form. (From $4.75 ea/1,000– –available
now.) Comlinear Corp., Fort Collins, CO Information 303-226-0500 Fax
303-226-0564
High-speed comparators have 1.8-ns propagation delay
The RC7341/7342 high-speed dual comparators feature a 1.8-ns propagation
delay and an input voltage range of -4 to +8 V. The devices have latched
data capability and ECL-compatible outputs capable of driving 50-ohm
terminated lines. Both devices have a typical delay dispersion of 50 ps,
a 4-ps/ degreesC drift, 5 mV of input offset error, and 10 microvolts/
degreesC of offset drift. The RC7341 is configured as a window comparator;
the RC7342 is configured as two independent comparators and is pin-for-pin
compatible with the industry-standard 9687. The comparators are available
in 16-pin plastic SOPs and 20-pin PLCCs. (From $9.35 ea/1,000– –stock to
eight weeks.) Raytheon Co., Mountain View, CA Literature 800-722-7074
Fax 415-969-8556
Single/quad precision op amps use low power
The LMC6061/81 and LMC6064/84 are single and quad versions, respectively,
of the LMC6062/82 precision CMOS op amps. The devices operate from a
single supply and provide true rail-to-rail output swing and an input
common-mode voltage range that includes ground. The LMC6061/64 have a
bandwidth of 0.1 MHz and use respective supply currents of 20 and 64
microamps; the LMC6081/84 have a bandwidth of 1.3 MHz while consuming 450
and 1,800 microamps, respectively. The devices are available in 8-
(LMC6061/81) and 14-pin (LMC6064/84) DIPs and SOPs. (The LMC6061, LMC6081,
LMC6064, and LMC6084 are from $1.85, $1.25, $2.60, and $2.40 ea/100,
respectively– –available now.) National Semiconductor Corp. Santa
Clara, CA Tracy Uedoi 408-721-5856
Difference amp for video frequencies
The AD830 video difference amplifier has a unity-gain bandwidth of 100
MHz and a common-mode rejection ratio of 100 dB at dc (60 dB at 4 MHz).
The device has built-in +/-2.3-V clipping, a differential voltage range of
+/-2 V, and a common-mode voltage range -11.5 to +13 V. Other
specifications of the AD830 include a settling time of 35 ns to 0.1%, gain
flatness of 0.1 dB to 15 MHz, and a differential gain and phase of 0.05%
and 0.08 degrees, respectively. The device is available in 8-pin SOPs,
plastic mini-DIPs, and CerDIPs. (From $2.42 ea/1,000– –stock.) Analog
Devices, Inc. Norwood, MA Information 617-937-1428 Fax 617-821-4273
Comparators use little power
The MAX921/922/923/924 combination comparator/reference ICs are offered
as featuring the lowest power consumption available in their class. The
MAX921 single comparator draws less than 4 microamps over temperature, and
includes a 1.18-V +/-1% reference, programmable hysteresis, and TTL/CMOS
outputs that require no external pull-up resistors. The comparators
continuously source as much as 40 mA and have a propagation delay of 12
microsecond with 10 mV of overdrive. The MAX921, MAX922 dual comparator,
and MAX923 dual comparator with reference come in 8-pin DIPs and SOPs. The
MAX924 quad comparator with reference is available in 16-pin DIPs and
SOPs. (From $1.50 ea/1,000– –available now.) Maxim Integrated Products
Sunnyvale, CA Customer Service 408-737-7600, ext. 6087
Op amps operate to 150 degreesC
The bipolar TL2828/29 dual/quad op amps and the LinCMOS TL2801/72
single/dual op amps are offered as the industry's first high-temperature
op amps in plastic packages. The family of devices has an operating range
that extends as high as 150 degreesC. The TL2801/72 devices offer
rail-to-rail outputs and maximum input offset voltages of 1.5 and 3 mV,
respectively, at a temperature of 150 degreesC. All four op amps are
packaged in DIPs, SOPs, and die form. (From $1.29 ea/1,000– –available
now.) Texas Instruments Inc. Dallas, TX Information 800-477-8924, ext.
3460
Device for widebandwidth systems
The OPA623 is a wideband monolithic op amp designed using an advanced
complementary bipolar process and an optimized current-feedback topology.
The amp provides a 350-MHz large-signal bandwidth at 2.8 Vp-p output
voltage, as well as a 2,100-V/μs slew rate. Other specifications of
the OPA623 include a 1.9-ns rise time at 5 Vp-p and differential phase and
gain errors of 0.08% and 0.05 degrees, respectively. In addition, the
device has an output current capability of +/-70 mA, and a quiescent current
use of +/-4 mA. The OPA623 is packaged in 8-pin DIPs and SOPs. ($5.10
ea/100– –stock.) Burr-Brown Corp., Tucson, AZ Bonnie Baker
800-548-6132 Fax 602-889-1510
100-MHz quad op amps for high-performance video
The HA5024/25 100-MHz current-feedback quad op amps are extensions of the
company's HA5020. Using 7.5 mA maximum per amplifier from +/-5 and +/-15-V
supplies, the devices provide an 800-V/μs slew rate, a 0.05-dB gain
flatness (5 MHz), and differential gain and phase of 0.025% and 0.025
degrees, respectively. Other specifications include a 2-mV offset
voltage, 10 microvolts/ degreesC of offset drift, a 60-dB common-mode
rejection ratio, and input bias current of 3 microamps. Both devices also
feature output current capability of 32 mA. The HA5024 additionally
includes a per-op-amp output enable/disable pin. The HA5024/25 are
available in 14-pin plastic DIPs and SOPs. (From $6.95 ea/100– –stock.)
Harris Corp., Melbourne, FL Information 800-4-HARRIS, ext. 7112
3130
Current-feedback op amps for video
The EL2260 and EL2460 are dual/quad current-feedback op amps that have a
-3-dB bandwidth of 130 MHz at a gain of +2 (180 MHz at AV=1 ) and a
slew rate of 1,400 V/μs. The devices can drive a double-terminated
75-ohm coaxial cable to video levels, while achieving a differential gain
and phase of 0.04% and 0.1 degrees, respectively. The op amps use 6.5 mA
of supply current per amplifier and operate from +/-2 to +/-15-V power
supplies. The EL2260 is available in 8-pin plastic DIPs, CerDIPs, and
SOPs. The EL2460 comes in 14-pin plastic DIPs and SOPs. (EL2260, from $3.
85 ea/100; EL2460, $7.15 ea/100– –available now.) Elantec, Inc.,
Milpitas, CA Pat Mayer 408-945-1323, ext. 303
Dual power op amp delivers up to 3 A
The PA21M is a high-reliability screened monolithic dual power op amp
capable of delivering up to 3 A from each amplifier. The device has a
supply range of 5 to 40 V with a common-mode range that includes the
negative rail. The PA21M, which can also be used with unregulated +/-15-V
supplies, has an internal power dissipation of 25 W per amp or 36 W
combined. The device is unity-gain stable and does not exhibit parasitic
oscillations common in monolithic power amps. The PA21M is packaged in a
TO-3 case. ($65.90 ea/100– –eight weeks ARO.) Apex Microtechnology
Corp. Tucson, AZ Marie Rivera 602-690-8603 Fax 602-888-3329
3130
45-MHz op amp runs on single +5-V supply
The LT1195 video op amp has a gain bandwidth of 45 MHz and slews at 140
V/μs when operated from +5 V. In addition, the device is unity-gain
stable and can drive cables and other low-impedance loads with a
guaranteed output drive current of 20 mA. dc specifications of the LT1195
include an input offset voltage of 3 mV, input offset current of 100 nA,
and open-loop gain of over 77 dB. The device is fully specified for
operation from +5-, 15-, and 18-V supplies and includes a shutdown feature.
The LT1195 comes in 8-pin plastic DIPs, CerDIPs, and SOPs. (From $1.65
ea/100– –available now.) Linear Technology Corp. Milpitas, CA Bob
Scott 408-432-1900 Fax 408-434-0507 Information 800-637-5545 Fax
408-434-0507
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