[FAQ] Achieve low noise, high precision and low bias currents with TI’s cutting edge op amp technologies

Technology

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Zero-drift

Amplifiers with zero-drift technology employ a unique, self-correcting technology which provides ultra-low input offset voltage (Vos) and near-zero input offset voltage drift over time and temperature (dVos/dT) suitable for precision applications.

• Eliminates calibration
• Very low noise for higher resolution
• Allows for very high gain circuits
• No 1/f noise

• Zero-drift amplifiers: features and benefits
• Chopper stabilization
• Industry's first zero-drift, zero-crossover operational amplifier

Devices:

All zero-drift devices

LV(<12V)

• OPA2388 – Industries only zero-crossover and zero-drift amplifier, with 10MHz of bandwidth and true RRIO operation
• OPA2333 – Ultra low current (0.17uA), 350kHz, and RRIO zero-drift amplifier

HV(>12V)

• OPA2189 – Industry’s widest bandwidth (14MHz) zero drift amplifier with MUX-friendly inputs
• OPA2188 – Low power (0.385mA), wide bandwidth, 2MHz, RRO, zero-drift amplifier
• OPA2182 – Industry’s lowest offset drift (12 nV/°C max), 5MHz, zero drift amplifier with MUX-friendly input
• TLV2186 – Cost optimized low power (90uA), rail-to-rail input and output, 24-V, zero-drift amplifier

Technology

Description  

System Benefits

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e-Trim™

e-Trim™ is TI’s patented post package trimming architecture. Correction current sources internal to the devices are adjusted during the final package-level manufacturing test. Once the trimming is completed, the gateway to trim circuitry is closed, so the trim control circuit is disabled and the adjustments become permanent.

• Constant Vos over CM
• Allows miniature package size
• Better long-term drift stability
• Versatile application use cases

Offset Correction Methods: Laser Trim, e-Trim™ , and Chopper

Devices:

LV(<12V)

• OPA2376 – High precision(25uV), low bias current(0.2pA), low noise(7.5nV/rtHz), low quiescent current(0.76mA) amplifier
• OPA2325 – Wide bandwidth 10-MHz, low-power(0.65mA), RRIO, zero-crossover amplifier

HV(>12V)

• OPA2191 – Low-power(0.14mA), high precision(25uV), RRIO e-trim™ amplifier (Cost optimized version OPA2196)
• OPA2192 – High Precision(25uV), Low noise(5.5nV/rtHz), wide bandwidth(10MHz), Low Input Bias Current(20pA) Op Amp With e-trim (Cost optimized version OPA2197)

• OPA2205 - Low power(250uA), low noise(7.2nV/rtHz), precision amplifier with e-trim™ and super beta input transistors
• OPA2206 - OVP (±40V), low power(250uA), low noise(7.2nV/rtHz), precision amplifier with e-trim™ and super beta input

Technology

Description  

System Benefits

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MUX-friendly

TI has developed a new input circuitry for high voltage CMOS inputs which does not require the antiparallel diodes for device protection. This technology minimizes the leakage current which in turn helps the amplifier settle faster.

• Faster settling times while slewing
• No increase in input bias or decrease in input impedance due to conducting diodes
• Fast MUX channel switching without compromising precision

MUX-friendly precision operational amplifiers

Devices:

All MUX-friendly devices

HV(>12V)

• OPA2191 – Low-power(0.14mA), high precision(25uV), RRIO e-trim™ amplifier (Cost optimized version OPA2196)
• OPA2192 – High Precision(25uV), Low noise(5.5nV/rtHz), wide bandwidth(10MHz), Low Input Bias Current(20pA) Op Amp With e-trim (Cost optimized version OPA2197)

• OPA2189 – 36-V, 14MHz, low-noise, RRO, CMOS, zero drift amplifier with MUX-friendly inputs
• OPA2182 – 36-V, industry’s lowest offset drift (12 nV/°C max), 5MHz, zero drift amplifier with MUX-friendly inputs

Technology

Description  

System Benefits

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Super Beta

TI’s Super Beta provides excellent matching of the transistors in the input differential pair. Along with offset trim methodologies, op amps with Super Beta have a very low offset voltage, offset drift and input bias current. Thanks to a very low input bias current, the current noise density is much lower and the input impedance is much higher than any other bipolar technology, including op amps with input bias cancellation circuits.

• Faster settling times while slewing
• No increase in input bias or decrease in input impedance due to conducting diodes
• Fast MUX channel switching without compromising precision

Provide robust input overvoltage protection for amplifier analog input modules

Op amps:

• OPA2205 - Low power(250uA), low noise(7.2nV/rtHz), precision amplifier with e-trim™ and super beta input transistors
• OPA2206 - OVP (±40V), low power(250uA), low noise(7.2nV/rtHz), precision amplifier with e-trim™ and super beta input

INAs:

• INA818 - Low power (350-µA), precision instrumentation amp (35uV) with ±60-V overvoltage protection (gain pins 1, 8)
• INA819 - Low power (350-µA), precision instrumentation amp (35uV) with ±60-V overvoltage protection (gain pins 2, 3)
• INA821 - High bandwidth (4.7MHz), low noise (7nV/√Hz), precision (35μV), low-power, instrumentation amp

FDAs:

• THP210 - High precision (40-μV, 0.1μV/C), high-voltage (36-V), low-noise (3.7-nV/√Hz), fully-differential amp

Technology

Description

System Benefits

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JFET Dielectric isolation

Thanks to a buried isolation layer between the n-type and p-type, TI’s JFET amplifiers provide unprecedented performance for low noise and low distortion circuits

• Enables higher system accuracy
• Versatile use cases
• Ideal for interfacing with high source impedances
• Maintains signal integrity

Distortion and source impedance in JFET-input op amps

Op amps:

• OPA828 - High-speed (45 MHz and 150V/μs),   low-noise (4 nV/√Hz), RRO, JFET operational amplifier
• OPA145 - 5.5 MHz, High Slew Rate, Low-Noise(7nV/rtHz), Low-power(445uA), RRO, JFET operational amplifier
• OPA140 - 11MHz, Low Noise(5.1nV/rtHz), Precision, RRO, JFET operational amplifier

Technology

Description

System Benefits

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Zero-crossover

Zero-crossover amplifiers employ a unique topology which eliminates the error induced by the crossover region that standard rail-to-rail amplifiers have. TI’s zero-crossover topology assures high linearity across the entire common-mode voltage range and lowest distortion for precision and general applications.

• No input crossover distortion
• Better Linearity
• Increased dynamic range
• Compatibility with precision ADCs

Zero-crossover Amplifiers: Features and Benefits

Op amps:

• OPA2388 – Industries only zero-crossover and zero-drift amplifier, with 10MHz of bandwidth and true RRIO operation
• OPA2325 - Precision(150uV), 10-MHz, Low-Noise(10nV/rtHz), Low-Power, RRIO, CMOS Zero-Crossover Operational Amplifier
• OPA2369 - 1.8V, 700nA, Zero-Crossover Rail-To-Rail I/O Operational Amplifier (cost optimized version)
• OPA2320 – Precision(150uV), Zero-Crossover, 20MHz, 0.9pA Ib, RRIO, CMOS Operational Amplifier