Datasheet Texas Instruments OPA128

Manufacturer	Texas Instruments
Series	OPA128

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Parametrics

Parameters / Models	OPA128JM	OPA128KM	OPA128LM	OPA128SM
Additional Features	N/A	N/A	N/A	N/A
Architecture	FET	FET	FET	FET
CMRR(Min), dB	80	80	80	80
CMRR(Typ), dB	118	118	118	118
GBW(Typ), MHz	1	1	1	1
Input Bias Current(Max), pA	0.075	0.075	0.075	0.075
Iq per channel(Max), mA	1.8	1.8	1.8	1.8
Iq per channel(Typ), mA	0.9	0.9	0.9	0.9
Number of Channels	1	1	1	1
Offset Drift(Typ), uV/C	5	5	5	5
Operating Temperature Range, C	-55 to 125	-55 to 125	-55 to 125	-55 to 125
Output Current(Typ), mA	34	34	34	34
Package Group	TO-99	TO-99	TO-99	TO-99
Package Size: mm2:W x L, PKG	8TO-99: 80 mm2: 8.96 x 8.96(TO-99)	8TO-99: 80 mm2: 8.96 x 8.96(TO-99)	8TO-99: 80 mm2: 8.96 x 8.96(TO-99)	8TO-99: 80 mm2: 8.96 x 8.96(TO-99)
Rail-to-Rail	Out	Out	Out	Out
Rating	Catalog	Catalog	Catalog	Catalog
Slew Rate(Typ), V/us	3	3	3	3
Total Supply Voltage(Max), +5V=5, +/-5V=10	36	36	36	36
Total Supply Voltage(Min), +5V=5, +/-5V=10	10	10	10	10
Vn at 1kHz(Typ), nV/rtHz	27	27	27	27
Vos (Offset Voltage @ 25C)(Max), mV	0.5	0.5	0.5	0.5

Eco Plan

Application Notes

• Download
  Designing Photodiode Amplifier Circuits with OPA128
  PDF, 76 Kb, File published: Oct 2, 2000
  The OPA128 ultra-low bias current operational amplifier achieves its 75fA maximum bias current without compromise. Using standard design techniques, serious performance trade-offs were required which sacrificed overall amplifier performance in order to reach femtoamp (fA = 10-15A) bias currents.
• Download
  Diode-Connected FET Protects Op Amps
  PDF, 49 Kb, File published: Oct 2, 2000
  Providing input-overload protection for sensitive measurement circuits proves difficult when you must not degrade the circuits? performance in the process. It?s an especially tricky problem when you?re measuring a material?s dielectric properties. In such an application, an ultra-low input bias current op amp serves as a current integrator to measure a dielectric?s response to a 100V step.
• Download
  Boost Instrument Amp CMR With Common-Mode Driven Supplies
  PDF, 175 Kb, File published: Sep 27, 2000
  Ever-increasing demands are being placed on instrumentation amplifier (IA) performance. When standard IAs can not deliver the required performance, consider this enhanced version. Dramatic performance improvements can be achieved by operating the input amplifiers of a classical three-op-amp IA from common-mode driven sub-regulated power supplies.
• Download
  Comparison of Noise Performance of FET Transimpedence Amp/Switched Integrator
  PDF, 66 Kb, File published: Sep 27, 2000
  Low-input current FET operational amplifiers are universlly used to monitor photodetector, or more commonly photodiode currents. These photodetectors bridge the gap between a physical event, light, and electronics. There are a variey of amplifier configurations to select from and the choice is based on noise, bandwidth, offset, and linearity. A considerable amount has been written on the performan
• Download
  Compensate Transimpedance Amplifiers Intuitively (Rev. A)
  PDF, 69 Kb, Revision: A, File published: Mar 30, 2005
  Transimpedance amplifiers are used to convert low-level photodiode currents to usable voltage signals. All too often, the amplifiers have to be empirically compensated to operate properly. The problem can be easily understood if one looks at all the elements involved.
• Download
  Tuning in Amplifiers
  PDF, 44 Kb, File published: Oct 2, 2000
  Have you ever had the experience of designing an analog gain block with an amplifier that is specified to be unity gain stable only to find that it is oscillating out of control in your circuit? Or have you ever replaced a stable voltage feedback amplifier with a current feedback amplifier to find that the current feedback amplifier immediately oscillates when placed in the amplifier socket? Oscil
• Download
  Single-Supply Operation of Operational Amplifiers
  PDF, 77 Kb, File published: Oct 2, 2000
  Operation of op amps from single supply voltages is useful when negative supply voltages are not available. Furthermore, certain applications using high voltage and high current op amps can derive important benefits from single supply operation.
• Download
  Op Amp Performance Analysis
  PDF, 76 Kb, File published: Oct 2, 2000
  This bulletin reflects the analysis power gained through knowledge of an op amp circuit's feedback factor. Feedback dictates the performance of an op amp both in function and in quality. The major specifications of the amplifier descibe an open-loop device awaiting feedback direction of the end circuit's function. Just how well the amplifier performs the function reflects through the feedback inte

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Manufacturer's Classification

• Semiconductors> Amplifiers> Operational Amplifiers (Op Amps)> Precision Op Amps