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OPA928 PREVIEW High-voltage femtoampere-input-bias precision e-trim™ operational amplifier with RRIO Next generation ultra-low bias current (1 fA) with improved bandwidth (2.5 MHz) and offset voltage (0.025 mV)

Product details

Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 15.5 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 4.5 Rail-to-rail In to V-, Out GBW (typ) (MHz) 1.3 Slew rate (typ) (V/µs) 1.5 Vos (offset voltage at 25°C) (max) (mV) 0.35 Iq per channel (typ) (mA) 0.45 Vn at 1 kHz (typ) (nV√Hz) 22 Rating Catalog Operating temperature range (°C) -40 to 85 Offset drift (typ) (µV/°C) 2.5 Input bias current (max) (pA) 0.025 CMRR (typ) (dB) 83 Iout (typ) (A) 0.021 Architecture CMOS Input common mode headroom (to negative supply) (typ) (V) -0.4 Input common mode headroom (to positive supply) (typ) (V) -1.9 Output swing headroom (to negative supply) (typ) (V) 0.1 Output swing headroom (to positive supply) (typ) (V) -0.13
Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 15.5 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 4.5 Rail-to-rail In to V-, Out GBW (typ) (MHz) 1.3 Slew rate (typ) (V/µs) 1.5 Vos (offset voltage at 25°C) (max) (mV) 0.35 Iq per channel (typ) (mA) 0.45 Vn at 1 kHz (typ) (nV√Hz) 22 Rating Catalog Operating temperature range (°C) -40 to 85 Offset drift (typ) (µV/°C) 2.5 Input bias current (max) (pA) 0.025 CMRR (typ) (dB) 83 Iout (typ) (A) 0.021 Architecture CMOS Input common mode headroom (to negative supply) (typ) (V) -0.4 Input common mode headroom (to positive supply) (typ) (V) -1.9 Output swing headroom (to negative supply) (typ) (V) 0.1 Output swing headroom (to positive supply) (typ) (V) -0.13
PDIP (P) 8 92.5083 mm² 9.81 x 9.43
  • (Maximum Limit, 25°C Unless Otherwise Noted)
  • Input Current (100% Tested): 25 fA
  • Input Current Over Temperature: 2 pA
  • Low Power: 750 µA
  • Low VOS: 350 µV
  • Low Noise: 22 nV/√Hz at 1 kHz Typical
  • (Maximum Limit, 25°C Unless Otherwise Noted)
  • Input Current (100% Tested): 25 fA
  • Input Current Over Temperature: 2 pA
  • Low Power: 750 µA
  • Low VOS: 350 µV
  • Low Noise: 22 nV/√Hz at 1 kHz Typical

Featuring 100% tested input currents of 25 fA maximum, low operating power, and ESD protection of 2000 V, the LMC6001 device achieves a new industry benchmark for low input current operational amplifiers. By tightly controlling the molding compound, Texas Instruments is able to offer this ultra-low input current in a lower cost molded package.

To avoid long turnon settling times common in other low input current op amps, the LMC6001A is tested three times in the first minute of operation. Even units that meet the 25-fA limit are rejected if they drift.

Because of the ultra-low input current noise of 0.13 fA/√Hz, the LMC6001 can provide almost noiseless amplification of high resistance signal sources. Adding only 1 dB at 100 kΩ, 0.1 dB at 1 MΩ and 0.01 dB or less from 10 MΩ to 2,000 MΩ, the LMC6001 is an almost noiseless amplifier.

The LMC6001 is ideally suited for electrometer applications requiring ultra-low input leakage such as sensitive photodetection transimpedance amplifiers and sensor amplifiers. Because input referred noise is only 22 nV/√Hz, the LMC6001 can achieve higher signal to noise ratio than JFET input type electrometer amplifiers. Other applications of the LMC6001 include long interval integrators, ultra-high input impedance instrumentation amplifiers, and sensitive electrical-field measurement circuits.

Featuring 100% tested input currents of 25 fA maximum, low operating power, and ESD protection of 2000 V, the LMC6001 device achieves a new industry benchmark for low input current operational amplifiers. By tightly controlling the molding compound, Texas Instruments is able to offer this ultra-low input current in a lower cost molded package.

To avoid long turnon settling times common in other low input current op amps, the LMC6001A is tested three times in the first minute of operation. Even units that meet the 25-fA limit are rejected if they drift.

Because of the ultra-low input current noise of 0.13 fA/√Hz, the LMC6001 can provide almost noiseless amplification of high resistance signal sources. Adding only 1 dB at 100 kΩ, 0.1 dB at 1 MΩ and 0.01 dB or less from 10 MΩ to 2,000 MΩ, the LMC6001 is an almost noiseless amplifier.

The LMC6001 is ideally suited for electrometer applications requiring ultra-low input leakage such as sensitive photodetection transimpedance amplifiers and sensor amplifiers. Because input referred noise is only 22 nV/√Hz, the LMC6001 can achieve higher signal to noise ratio than JFET input type electrometer amplifiers. Other applications of the LMC6001 include long interval integrators, ultra-high input impedance instrumentation amplifiers, and sensitive electrical-field measurement circuits.

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* Data sheet LMC6001 Ultra, Ultra-Low Input Current Amplifier datasheet (Rev. I) PDF | HTML 29 Sep 2015
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017

Design & development

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Simulation model

LMC6001A PSpice Model (Rev. B)

SNOM216B.ZIP (20 KB) - PSpice Model
Simulation model

LMC6001B PSpice Model

SNOM690.ZIP (15 KB) - PSpice Model
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CIRCUIT060015 — Adjustable reference voltage circuit

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PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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User guide: PDF
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