12.6V, Low-noise, single-ended-to-differential, high input impedance amplifier
Product details
Parameters
Package | Pins | Size
Features
- Wide supply range: 3 V to 12.6 V
- High input impedance: 325 MΩ
- Voltage noise:
- Input-referred (f ≥ 5 kHz): 2.3 nV/√Hz
- Output-referred (f ≥ 10 kHz): 8.3 nV/√Hz
- Differential output offset: ±700 µV (maximum)
- Output offset drift: ±1.5 µV/°C (typical)
- A2 bias current cancellation, IB: ±5 nA (typical)
- Gain-bandwidth product: 400 MHz
- Small-signal bandwidth: 44 MHz (G = 2 V/V)
- Slew rate: 140 V/µs
- HD2, HD3 (VOD = 10
VPP, 50 kHz):
–122 dBc, –140 dBc - Rail-to-rail output:
- High linear output current: 60 mA (typ)
- Quiescent current: 3.1 mA
- Disable mode: 12-µA quiescent current
- Extended temperature operation:
–40°C to +125°C
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Description
The OPA862 is a single-ended to differential analog-to-digital converter (ADC) driver with high input impedance for directly interfacing with sensors. The device only consumes 3.1-mA quiescent current for an output-referred noise density of 8.3 nV/√Hz in a gain of 2-V/V configuration. A fully differential amplifier configured in a gain of 1 V/V with 1-kΩ resistors must be less than 1 nV/√Hz to achieve the OPA862 equivalent output-referred noise density of 8.3 nV/√Hz. The OPA862 can be configured for other gains using external resistors. The device has a large gain-bandwidth product of 400 MHz and a slew rate of 140 V/µs. This yields exceptional linearity and fast-settling, 18-bit performance over comparable single-ended-to-differential ADC drivers. The device includes a reference input pin for setting the output common-mode voltage.
The OPA862 is fully characterized to operate over a wide supply range of 3 V to 12.6 V, and features a rail-to-rail output stage. The device is fabricated using Texas Instruments’ proprietary, high-speed, silicon-germanium (SiGe) process and achieves exceptional distortion performance for 18-bit systems. The device includes a disable mode that consumes only 12-µA quiescent current in power-down state.
The OPA862 is rated to work over the extended industrial temperature range of –40°C to +125°C.
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Preproduction samples are available (XOPA862IDTKT). Request now
Technical documentation
| Type | Title | Date | |
|---|---|---|---|
| * | Datasheet | OPA862 High Input Impedance, Single-Ended to Differential ADC Driver datasheet (Rev. B) | Feb. 14, 2020 |
| User guides | OPA862D Evaluation Module | Aug. 05, 2019 | |
| Technical articles | How to reduce distortion in high-voltage, high-frequency signal generation for AWGs | Oct. 30, 2018 | |
| Technical articles | What are the advantages of using JFET-input amplifiers in high-speed applications? | Jun. 18, 2018 | |
| Technical articles | How to lay out a PCB for high-performance, low-side current-sensing designs | Feb. 06, 2018 | |
| Technical articles | Low-side current sensing for high-performance cost-sensitive applications | Jan. 22, 2018 | |
| Application notes | Noise Analysis for High Speed Op Amps (Rev. A) | Jan. 17, 2005 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
Features
- Single-ended high impedance input with differential output
- Configurable gain resistors with optional additional feedback connection
- Output transformer included to interface with single-ended test equipment
- Fully configurable power-down and reference voltage inputs
Design tools & simulation
Features
- Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
- Noise calculations
- Common unit translation
- Solves common amplifier circuit design problems
- Gain selections using standard resistors
- Filter configurations
- Total noise for common amplifier configurations
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CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| (DTK) | 8 | View options |
| SOIC (D) | 8 | View options |
Ordering & quality
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Training series
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