OPA189ID - 14MHz Zero-Drift Precision Op Amp, 36V | Texas Instruments
MPN: OPA189ID ✓ פעילOPA189ID סקירה
A zero-drift amplifier is an operational amplifier whose offset voltage and offset drift are continuously corrected by an internal chopping/auto-zero style system rather than by ordinary temperature compensation alone. In the wider hierarchy it sits as a precision amplifier inside the operational amplifier class, which in turn belongs to the analog IC and signal-conditioning chain. Because the residual offset stays in the nanovolt-to-sub-microvolt range over temperature, zero-drift devices are the preferred building block for current sensing, bridge instrumentation, and sensor front ends where long-term calibration drift matters more than raw bandwidth.
Key features of the OPA189 include a 14 MHz gain-bandwidth product, a mux-friendly input architecture that tolerates large differential input swings before saturation, rail-to-rail output operation for maximum output swing on the supply rails, ultra-low offset voltage of 0.4 uV, and offset drift of only 0.005 uV/degC. Because it is a CMOS design, input bias current stays very low, and the controlled start-up system provides repeatable power-up behavior for precision systems.
Internally, the amplifier combines a zero-drift input stage with a conventional wide-band output stage. The result is fast settling and 14 MHz of small-signal bandwidth while the DC error terms remain near the chopping-noise floor. The MUX-friendly input stage uses internal protection structures that keep the amplifier in its linear region even when several microvolts-to-millivolts of differential signal appears during multiplexer switching, which removes the need for external series resistors between the mux and the amplifier.
Typical uses include current-shunt and power-supply sense amplifiers, 16-to-24-bit SAR and delta-sigma analog front ends, resistive sensor bridges, precision current measurement for motor control, and low-noise signal chains in instrumentation and test equipment. It also suits audio and communication receive chains that need low noise plus good DC stability.
When designing with the OPA189ID, remember that the output swings rail-to-rail but the input common-mode range and bias current are specific per device; check the manufacturer datasheet before operating near the rails. Provide standard supply decoupling and respect the minimum supply voltage, and route the feedback network away from noisy switching nodes. This page combines package, pricing, cross-reference and drop-in replacement data with practical design notes that go beyond the manufacturer datasheet.
חלופות תחליף ישיר עבור OPA189ID — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם OPA189ID (אותו גורם צורה וטביעת רגל) — שונים ב Package, Input Offset Voltage, Input Offset Voltage Drift, Number of Channels, Output Swing.
OPA192ID
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←OPA197ID
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
OPA188ID
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
OPA182ID
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
OPA321ID
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
OPA875ID
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←OPA189ID דירוגים מרביים ומאפיינים חשמליים
| Number of Channels | 1 |
| Amplifier Type | Zero-Drift Precision Operational Amplifier |
| Gain Bandwidth Product | 14 MHz |
| Maximum Supply Voltage | 36 V |
| Output Swing | Plus or minus 18 V |
| סוג פלט | Rail-to-Rail Output |
| Input Offset Voltage | 0.4 uV |
| Input Offset Voltage Drift | 0.005 uV/degC |
| Input Architecture | MUX-friendly |
| Process Technology | CMOS |
| Start-Up Behavior | Controlled start-up system |
| מארז | 8-pin SOIC (D) |
| מספר פינים | 8 |
| סוג הרכבה | Surface Mount |
| Shipping Container | Tube |
תצורת פינים של OPA189ID
| פין 1 | OUT — Output pin 1 |
| פין 2 | V- — Negative supply connection |
| פין 3 | IN+ — Non-inverting input |
| פין 4 | V- — Negative supply connection |
| פין 5 | NC — Not connected (per datasheet) |
| פין 6 | IN- — Inverting input |
| פין 7 | V+ — Positive supply connection |
| פין 8 | OUT — Output pin 2 |
יישומים טיפוסיים
OPA189ID מתאים עבור 6 יישוםs: Current Shunt and Power-Supply Sense Amplifier, Precision SAR and Delta-Sigma Analog Front End, Resistive Bridge and Sensor Signal Conditioning, Multiplexed Sensor and Test-Instrument Signal Chain, Motor Control and Power Converter Feedback, Low-Noise Audio and Communications Receive Chain.
Current Shunt and Power-Supply Sense Amplifier
The OPA189ID suits high-side and low-side shunt sensing where the measurement error must stay stable across temperature. Its 0.4 uV offset voltage and 0.005 uV/degC offset drift keep the amplified error from dominating a millivolt-level shunt signal, while 14 MHz of gain-bandwidth product provides fast response during current steps. Place the amplifier in a differential configuration across the shunt, use matched 0.1 percent feedback resistors, and keep the input pair away from the switching node. The rail-to-rail output swings to plus or minus 18 V on a 36 V supply, so the gain stage can directly drive a downstream ADC without headroom concerns.
מומלץ
Precision SAR and Delta-Sigma Analog Front End
For 16-bit and 24-bit data acquisition, the OPA189ID provides the DC accuracy that converts a high-resolution converter into real measurement resolution. The zero-drift architecture holds offset error below a microvolt and drift below 0.01 uV/degC, which matters more than raw bandwidth in a slow, high-resolution conversion. Its 14 MHz bandwidth and fast settling let the amplifier recover between multiplexer channels, and the MUX-friendly inputs tolerate the switching transients directly without added series resistors. Use the device as the final buffer in front of the converter input, with the reference and excitation routed on separate quiet layers.
מומלץ
Resistive Bridge and Sensor Signal Conditioning
The OPA189ID is a natural fit for resistive bridges, strain gauges and RTD-style front ends where the sensor output is small and temperature dependent. Offset drift of 0.005 uV/degC converts to a negligible input-referred error after typical bridge gains of 100 to 1000, so long-term calibration drift is dominated by resistor tolerance and self-heating rather than the amplifier. The CMOS input stage keeps bias current very low, which prevents loading of the bridge legs, and the rail-to-rail output supports single-supply operation. Place the amplifier directly at the bridge node and keep the excitation return path quiet and shielded.
מומלץ
Multiplexed Sensor and Test-Instrument Signal Chain
Instrumentation with a relay or analog multiplexer in front of the amplifier is exactly the environment the MUX-friendly input stage was designed for. The OPA189ID tolerates large differential input excursions during channel switching without saturating, so 100-ohm to 1-kohm protection resistors that older precision amplifiers required can often be reduced, improving signal bandwidth and reducing component count. The 14 MHz gain-bandwidth product settles quickly after each switch, and the 36 V supply capability tolerates long-run test fixtures with high common-mode levels. Verify per-channel settling time in the manufacturer datasheet when scanning many channels at high rates.
מומלץ
Motor Control and Power Converter Feedback
In motor drives and DC-DC converters, the current-sense feedback amplifier must respond quickly to transients while keeping the control-loop DC error negligible. The OPA189ID combines 14 MHz of small-signal bandwidth with sub-microvolt offset, so the sensed current does not shift the operating point as the converter heats up, and the mux-friendly inputs absorb the fast common-mode swings present on a switching node. Its rail-to-rail output drives comparator and ADC inputs directly, and the 36 V rating tolerates elevated bus voltages after a divider. Keep the feedback path short and decouple the supply close to the amplifier pins.
מומלץ
Low-Noise Audio and Communications Receive Chain
Receive-side audio and communication chains benefit from the combination of low noise with excellent DC stability, because a zero-drift amplifier removes the low-frequency hum and thermal drift that would otherwise require AC coupling and blocking capacitors. The OPA189ID can sit at the output of a microphone or line-level front end as a DC-stable gain stage, preserving bass response while holding offset well below a microvolt. Its 14 MHz bandwidth covers the full audio band with margin, and the rail-to-rail output drives line-level stages directly. Keep the input node away from digital return currents to preserve the noise floor.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור OPA189ID — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | OPA192ID | OPA197ID | OPA188ID | OPA182ID |
|---|---|---|---|---|---|
| Package | SOIC-8 (D) | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Gain Bandwidth Product | 14 MHz | 10 MHz | 10 MHz | 8.5 MHz | 8 MHz |
| Maximum Supply Voltage | 36 V | 36 V | 36 V | 36 V | 36 V |
| Output Type | Rail-to-Rail Output | Rail-to-Rail Output | Rail-to-Rail Input and Output | Rail-to-Rail Output | Rail-to-Rail Input and Output |
| MUX-Friendly Input Stage | Yes | Yes | No | Yes | Yes |
| Zero-Drift Architecture | Yes | Yes | No | Yes | Yes (chopper) |
מבדילים עיקריים
- Lowest offset voltage and drift in the 8-pin SOIC precision class (לעומתOPA192ID)
- Higher bandwidth while retaining zero-drift DC performance (לעומתOPA188ID)
- MUX-friendly input stage eliminates external input series resistors (לעומתOPA197ID)
- Same 8-pin SOIC footprint as the fastest TI single alternatives (לעומתOPA321ID)
הערות תכנון
Place the OPA189ID close to the multiplexer or sensor node and keep the differential input traces short, matched in length and away from switching circuitry. The mux-friendly input stage removes the need for the 100-ohm to 1-kohm series resistors that older precision amplifiers required, but those resistors still help limit ESD and hot-plug stress, so add them only where the interface can see such events. Route the feedback network directly above the device and tie the ground return to the quiet analog plane rather than to a switching return path.
Decouple pins 4 and 7 with a small ceramic capacitor placed directly across the pins, and add bulk capacitance at the supply entry. Because the zero-drift stage continuously corrects its own error terms, supply noise and ground bounce can modulate the residual error more than they would in a fixed-offset amplifier. A 36 V maximum supply rating does not mean a 36 V rail is required or desirable - using a lower supply rail reduces the dissipation and improves headroom for the rail-to-rail output swing.
Do not substitute the OPA189ID on a design that depends on rail-to-rail input operation without checking the common-mode range, since this part is specified for rail-to-rail output. Also avoid overdriving the inputs in ways that exceed the maximum differential input voltage, and do not assume the 14 MHz gain-bandwidth product applies at gains where the amplifier is internally compensated - verify the gain-bandwidth and stability plots in the manufacturer datasheet before building a high-gain stage. Finally, keep the 0.1 percent feedback resistors and matched resistor network thermal conditions similar to avoid drift that swamps the amplifier's own 0.005 uV/degC rating.
Zero-drift amplifiers modulate their internal correction loop at chopping frequencies, which can appear as narrowband artifacts around a few kHz to tens of kHz. In low-level signal paths, keep the input source impedance low and the amplifier gain modest so the artifact stays well below the signal band of interest, and correlate any observed tone with the chopping rate rather than with external interference. In audio and instrumentation chains, placing the amplifier after a modest preamplifier gain stage usually hides the artifact more effectively than placing it directly on a microvolt-level source.
מידע על תאימות
Environmental and automotive qualification documents were not listed on the product pages for this part; request the manufacturer declarations for RoHS, REACH and AEC-Q100 status through the Request a Quote form on this page.
