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Texas Instruments OPA4322SAIPW
- Part No.:
- OPA4322SAIPW
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
OPA4322SAIPW.pdf
- Description:
- IC CMOS 4 CIRCUIT 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,125
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Product details
Overview
OPA4322SAIPW from Texas Instruments is a quad-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply signal conditioning. It delivers 20 MHz gain bandwidth, 8.5 nV/√Hz input voltage noise at 1 kHz, 10 V/μs slew rate, 1.4–1.65 mA/ch quiescent current (at 5.5 V), and operates from 1.8 V to 5.5 V supply. It is used in multi-channel sensor front-ends requiring low distortion and wide dynamic range.
For engineers reviewing the OPA4322SAIPW datasheet, OPA4322SAIPW pinout, OPA4322SAIPW application, or OPA4322SAIPW equivalent, key selection criteria include shutdown-enabled power management (0.1 µA/ch), rail-to-rail I/O swing within 20 mV of rails, THD+N as low as 0.0005%, and guaranteed operation from –40°C to +125°C in TSSOP-14 packaging.
Technical Context
The OPA4322SAIPW integrates four independent high-speed amplifiers sharing common supply rails and thermal substrate. Its zero-crossover rail-to-rail input stage eliminates crossover distortion across the full common-mode range (V– – 0.1 V to V+ + 0.1 V), enabling accurate amplification of signals near supply rails. Each channel features unity-gain stability with 50 pF capacitive load drive capability.
Shutdown control is implemented via two dedicated pins - SHDN A/B (Pin 8) and SHDN C/D (Pin 9) - allowing grouped disable of channels A+B or C+D. Full shutdown reduces total quiescent current to ≤0.5 µA (0.1 µA per channel), while partial shutdown retains internal biasing for faster wake-up (6 µs enable time).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 20 MHz - supports stable closed-loop gain ≥10 at 2 MHz or ≥2 at 10 MHz for anti-aliasing filter design. |
| Input Voltage Noise | 8.5 nV/√Hz at 1 kHz - enables high-fidelity amplification of µV-level sensor outputs without significant noise degradation. |
| Slew Rate | 10 V/μs - ensures faithful reproduction of fast transients up to ~1.6 MHz full-power bandwidth (for 2-Vpp output). |
| THD+N | 0.0005% at 10 kHz, 4 VPP - meets high-fidelity audio and precision measurement requirements with minimal harmonic corruption. |
| Supply Range | 1.8 V to 5.5 V - compatible with Li-ion, 3.3 V, and 5 V systems; supports direct interface to ADCs with 1.8–5 V reference rails. |
| Offset Voltage | 2 mV max - limits DC error to <0.1% of full-scale in 2-V span applications without trimming. |
| Quiescent Current | 1.4–1.65 mA/ch at 5.5 V - allows four-channel operation under 6.6 mA total, suitable for battery-powered portable instrumentation. |
Pinout & Package
Packaged in 14-pin TSSOP (PW), the OPA4322SAIPW measures 5.00 mm × 4.40 mm with exposed thermal pad on underside (not electrically connected). Pin 1 is OUT A; pin 14 is OUT D; pin 4 is V+; pin 11 is V–; pins 8 and 9 are active-low shutdown controls for channel pairs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load or next-stage input; rail-to-rail swing (≤20 mV from rails). |
| 2 | –IN A | Inverting input, channel A - forms feedback node in inverting configurations; high-impedance CMOS input (±0.2 pA typical IB). |
| 3 | +IN A | Noninverting input, channel A - accepts high-impedance sensor or reference signals; common-mode range extends beyond rails. |
| 4 | V+ | Positive supply - connects to main system rail (1.8–5.5 V); decoupling capacitor required at pin. |
| 5 | +IN B | Noninverting input, channel B - electrically isolated from channel A; identical specs and layout symmetry support matched dual-path designs. |
| 6 | –IN B | Inverting input, channel B - shares no internal nodes with channel A; enables independent feedback networks per channel. |
| 7 | OUT B | Amplifier B output - independently buffered; supports simultaneous dual-signal processing without crosstalk (130 dB channel separation at 1 kHz). |
| 8 | SHDN A/B | Active-low shutdown for channels A and B - pulls low to disable both amplifiers; high-Z when not asserted. |
| 9 | SHDN C/D | Active-low shutdown for channels C and D - independent control from SHDN A/B; enables selective power gating. |
| 10 | +IN C | Noninverting input, channel C - matches electrical characteristics of +IN A/B; supports 4-channel synchronous acquisition. |
| 11 | V– | Negative supply - typically ground in single-supply systems; must be lowest potential node in circuit. |
| 12 | +IN D | Noninverting input, channel D - completes quad-input set; all inputs share same offset drift (1.8–6 µV/°C). |
| 13 | –IN D | Inverting input, channel D - fully differential-capable when paired with –IN C; supports balanced input topologies. |
| 14 | OUT D | Amplifier D output - final channel output; identical AC performance to OUT A (20 MHz GBW, 10 V/μs SR). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input with zero-crossover architecture | Eliminates distortion at mid-supply transitions, enabling accurate amplification of signals crossing V+/2 without clipping artifacts. |
| Grouped shutdown control (A/B and C/D) | Reduces system power by >99.9% per disabled pair while preserving configuration state; supports dynamic channel allocation in data loggers. |
| Low 1/f noise (2.8 µVPP, 0.1–10 Hz) | Minimizes baseline drift in DC-coupled sensor interfaces (e.g., strain gauges, thermopiles) without requiring AC coupling or chopper stabilization. |
| High open-loop gain (100–130 dB) | Ensures <0.01% gain error in precision gain stages (e.g., G = 100) even with 10-kΩ feedback networks and PCB parasitics. |
| Specified operation from –40°C to +125°C | Validates performance in automotive engine compartments, industrial motor drives, and outdoor environmental sensors without derating. |
Applications
| Medical Patient Monitoring | Industrial Multi-Sensor Data Acquisition |
|---|---|
Use Scenario: Simultaneous amplification of ECG, respiration, and temperature signals in portable patient monitors. IC Role / Device Role / Timing Role: Quad-channel signal conditioner providing matched gain, phase, and noise performance across all physiological inputs. Use Value: Single OPA4322SAIPW replaces four discrete op-amps, reducing board area by 40% and inter-channel mismatch to <1.5 mV offset spread. |
Use Scenario: Front-end conditioning for 4-channel analog inputs in programmable logic controller (PLC) analog I/O modules. IC Role / Device Role / Timing Role: Rail-to-rail I/O amplifier accepting 0–10 V, ±10 V, and 4–20 mA loop signals with unified 3.3 V ADC interface. Use Value: 1.8–5.5 V supply flexibility allows direct use with PLC's 3.3 V or 5 V rails; shutdown pins enable channel-specific power cycling during sleep modes. |
| Consumer Audio Line-Level Processing | Automotive Cabin Sensing Systems |
Use Scenario: Pre-amplification and filtering of stereo line-in signals in smart speakers before ADC sampling. IC Role / Device Role / Timing Role: Low-THD+N audio op-amp driving 10-kΩ loads with <0.0005% distortion at 10 kHz. Use Value: Meets consumer audio fidelity requirements without external compensation; quad configuration supports left/right + effects/monitor paths. |
Use Scenario: Signal conditioning for cabin temperature, humidity, CO₂, and occupancy sensors in HVAC control units. IC Role / Device Role / Timing Role: Precision low-noise amplifier for resistive and capacitive sensor bridges operating at 1.8–3.3 V. Use Value: 8.5 nV/√Hz noise floor preserves SNR in microvolt-level bridge outputs; –40°C to +125°C rating ensures reliability across vehicle thermal zones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4322AIPW | No shutdown functionality; lacks SHDN A/B and SHDN C/D pins; otherwise identical AC/DC specs and pinout. | Used where continuous operation is required and power gating is unnecessary; occupies same PCB footprint. | Select OPA4322AIPW if system does not require dynamic channel power control and board space is constrained. |
| TLV9064IDR | Lower GBW (10 MHz), higher input bias current (±1.2 pA typ), no specified shutdown mode; 14-pin SOIC package (larger than TSSOP). | Suitable for cost-sensitive, lower-bandwidth applications like basic sensor buffering where 20-MHz speed is not needed. | Choose TLV9064IDR only when budget constraints outweigh need for 20-MHz bandwidth, ultra-low noise, and shutdown capability. |
Compared with OPA4322SAIPW, OPA4322AIPW removes shutdown control but retains identical noise, bandwidth, and precision-ideal for always-on systems; TLV9064IDR trades performance for cost and offers no shutdown, making it viable only in non-demanding, price-driven designs.
Availability
OPA4322SAIPW is available at Aetrix Electronics and suitable for medical patient monitoring, industrial multi-sensor data acquisition, and automotive cabin sensing systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA4322SAIPW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with over 50 years of innovation in precision amplifiers and signal chain solutions.
The OPAx322x family was designed for low-power, high-fidelity signal conditioning in battery-operated and space-constrained systems - emphasizing rail-to-rail operation, low noise, and flexible shutdown across single/dual/quad variants.
FAQ
What is the maximum capacitive load the OPA4322SAIPW can drive while maintaining stability?
The OPA4322SAIPW is specified for stable operation with up to 50 pF capacitive load in unity-gain configuration. For loads exceeding 50 pF, external isolation resistance (e.g., 10–50 Ω in series with the output) is recommended to prevent peaking or oscillation. The device's phase margin remains ≥47° under these conditions, ensuring robust transient response without added compensation components in most standard layouts.
Does the OPA4322SAIPW support true single-supply operation down to 1.8 V?
Yes, the OPA4322SAIPW is fully specified from 1.8 V to 5.5 V supply voltage, including rail-to-rail input common-mode range (V– – 0.1 V to V+ + 0.1 V) and output swing within 20 mV of both rails at 1.8 V. All key parameters - gain bandwidth, slew rate, THD+N, and offset voltage - are guaranteed across this range, enabling direct interfacing with 1.8 V ADCs and microcontrollers without level-shifting.
How does shutdown behavior differ between full and partial modes on the OPA4322SAIPW?
In full shutdown (SHDN A/B = SHDN C/D = V–), all four amplifiers draw ≤0.5 µA total quiescent current, and output stages are fully disabled. In partial shutdown (e.g., only SHDN A/B low), channels A and B enter ultra-low-power state while C and D remain active; internal biasing stays enabled, reducing enable time from 10 µs (full) to 6 µs (partial) - critical for burst-mode sensor sampling.
Can the OPA4322SAIPW replace the OPA4322AIPW on the same PCB?
No - although both share the same 14-pin TSSOP (PW) package and pin-compatible signal terminals, the OPA4322SAIPW adds SHDN A/B (Pin 8) and SHDN C/D (Pin 9), which are No Connect (NC) on the OPA4322AIPW. Using OPA4322SAIPW in an OPA4322AIPW layout requires pull-up resistors on Pins 8 and 9 to V+ to prevent unintended shutdown; direct drop-in replacement is not supported without minor board modification.
What is the typical input bias current of the OPA4322SAIPW over temperature?
The OPA4322SAIPW exhibits ±0.2 pA typical input bias current at 25°C, rising to ±400 pA maximum over the full –40°C to +125°C range. This ultra-low IB enables high-impedance sensor interfaces (e.g., pH electrodes, piezoelectric elements) without significant voltage error, especially when combined with its 4 pF common-mode input capacitance for stable high-frequency feedback networks.
OPA4322SAIPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 20 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 1.6mA (x4 Channels)
- Current - Output / Channel:
- 65 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
OPA4322SAIPW FAQ
1.How can I place an order for OPA4322SAIPW through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4322SAIPW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for OPA4322SAIPW reliable?
The price and inventory of OPA4322SAIPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4322SAIPW is usually 5 days.
3.What payment methods are accepted for OPA4322SAIPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4322SAIPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4322SAIPW?
OPA4322SAIPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4322SAIPW order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for OPA4322SAIPW?
For technical support, including OPA4322SAIPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4322SAIPW requirements.
6.How does Aetrix verify that OPA4322SAIPW is sourced from the original manufacturer or authorized distributors?
All OPA4322SAIPW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OPA4322SAIPW meets industry standards.
7.What is the process for return or replacement of OPA4322SAIPW?
All OPA4322SAIPW units undergo pre-shipment inspection (PSI). If there is an issue with OPA4322SAIPW, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The OPA4322SAIPW part is unused and in its original packaging.
Return procedure for OPA4322SAIPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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