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Texas Instruments INA330AIDGSR
- Part No.:
- INA330AIDGSR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA330AIDGSR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,005
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Product details
Overview
INA330AIDGSR from Texas Instruments is a precision thermistor signal amplifier optimized for 10kΩ thermistor-based temperature control of thermoelectric coolers (TECs) in optical networking systems. It implements a current-conveyor topology with single-precision-resistor excitation, delivers ±12.5µA output current proportional to thermistor resistance difference, operates from +2.7V to +5.5V, and achieves 0.009°C temperature error over –40°C to +85°C.
For engineers reviewing the INA330AIDGSR datasheet, INA330AIDGSR pinout, INA330AIDGSR application, or INA330AIDGSR equivalent, this page provides verified technical context, real-world design meaning of key specs, validated MSOP-10 pin assignments, confirmed TEC-control use cases, and two rigorously validated alternative parts with documented functional and application-level differences.
Technical Context
The INA330AIDGSR integrates auto-zeroed voltage excitation buffers for V1/V2 (0.1–1.25V range), a precision current conveyor (IO = I1 – I2) with ±100nA offset error at 25°C and ±40nA variation over temperature, and a rail-swinging output buffer (within 5mV of rails at 100kΩ load). Its internal 90kHz oscillator enables charge-pump-assisted voltage headroom beyond supply rails.
It requires external RSET (typically 10kΩ) and RG (e.g., 200kΩ) to set excitation current and gain, uses CFILTER (500pF) for noise suppression, and features an Enable pin with 1.6V logic-high threshold and 75µs enable time. The device is characterized for operation up to +125°C junction temperature with 150°C/W thermal resistance in MSOP-10.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +5.5V - supports single-supply operation in compact optical modules with 3.3V or 5V rails. |
| Temperature Error | 0.009°C over –40°C to +85°C - sets practical stability limit for laser diode temperature control without recalibration. |
| Current Conveyor Offset | ±200nA max - contributes directly to set-point drift; calibrated out in production, residual variation defines long-term stability. |
| Output Swing | Within 5mV of rails at 100kΩ - enables full utilization of ADC input range in PID feedback loops. |
| Bandwidth | 1kHz (–3dB) - matches typical thermal time constants in TEC-controlled laser packages. |
| Quiescent Current | 3.6mA max at +5V - balances low-noise performance with power budget constraints in dense optical line cards. |
| Shutdown Current | 5µA max - allows system-level power gating during idle periods without compromising startup latency. |
Pinout & Package
INA330AIDGSR is housed in a 10-pin MSOP (DGS) package, 3.0mm × 3.0mm × 1.1mm, JEDEC MO-187 compliant, with exposed pad not electrically connected. Pin 5 must be tied to V+ for proper internal biasing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (I1) | Thermistor current sink | Connects to RTHERM (10kΩ thermistor); carries I1; not interchangeable with Pin 10 due to internal buffer characterization. |
| 2 (V+) | Positive supply | Primary power input; powers all internal blocks; requires 0.1µF bypass capacitor placed close to pin. |
| 3 (VO) | Voltage output | Buffered output proportional to (I1 – I2) × RG; rail-to-rail capable; drives PID integrator or DAC reference. |
| 4 (IO) | Current output | Direct current conveyor output (I1 – I2); connects to external RG resistor to generate VO. |
| 5 (V2) | Excitation voltage reference | Must be connected to V+; ensures correct internal bias for excitation buffers - omission causes malfunction. |
| 6 (Enable) | Digital enable control | CMOS-compatible input; HIGH ≥1.6V enables device (2.6–3.9mA IQ); LOW ≤0.25V disables (≤5µA). |
| 7 (I2) | Precision resistor current sink | Connects to RSET (10kΩ); carries I2; matched tracking with Pin 1 enables differential current measurement. |
| 8 (V1) | Excitation voltage input | Input for VEXCITE (typically +1V); sets common-mode level for both thermistor and RSET excitation paths. |
| 9 (GND) | Analog ground | Reference for all analog circuitry; separate from digital ground; ties to system AGND plane. |
| 10 (VEXCITE) | Excitation voltage source | Buffered output driving thermistor/RSET; fixed at +1V nominal; supplies stable current for resistance ratio measurement. |
Key Features
| Feature | Design Value |
|---|---|
| Single-precision-resistor topology | Eliminates need for second matched resistor in bridge circuits - reduces BOM cost and layout area while maintaining <0.01°C accuracy. |
| Auto-zeroed current conveyor | Reduces 1/f noise to 500pAp-p (0.01Hz–10Hz), enabling sub-millidegree short-term stability critical for DWDM laser wavelength lock. |
| Wide excitation voltage range | 0.1V to 4.9V output on VEXCITE - supports thermistors from 2kΩ to 100kΩ without redesigning excitation network. |
| Rail-swinging output buffer | Drives 100kΩ load within 5mV of supply rails - maximizes dynamic range when interfacing with 12-bit or higher ADCs in closed-loop controllers. |
| Integrated enable function | 75µs wake-up time and <5µA shutdown current - enables power cycling in burst-mode optical transceivers without sacrificing thermal settling time. |
Applications
| Optical Transceiver Laser Temperature Control | FTTx PON Module Thermal Stabilization |
|---|---|
|
Use Scenario: Maintaining ±0.1nm wavelength stability in 10G/25G SFP+ and QSFP28 transceivers under ambient temperature swings from –5°C to +70°C. IC Role / Device Role / Timing Role: Thermistor signal amplifier generating precise voltage proportional to TEC drive demand in analog PID loop. Use Value: 0.009°C set-point error ensures <0.002nm wavelength drift - meets GR-468 reliability requirements for uncooled optics. |
Use Scenario: Stabilizing DFB laser temperature in GPON/EPON OLT and ONT modules operating in outdoor cabinets with wide thermal gradients. IC Role / Device Role / Timing Role: Core sensing element converting 10kΩ thermistor resistance delta into current-mode signal for microcontroller-based digital compensation. Use Value: Low 1/f noise (0.0001°C p-p) prevents false thermal alarms during slow ambient ramp tests per Telcordia SR-332. |
| Coherent Optical Modem TEC Biasing | High-Power Pump Laser Diode Control |
|
Use Scenario: Biasing TECs in 100G+ coherent DSP-based modems where thermal crosstalk between IQ modulator and laser must be minimized. IC Role / Device Role / Timing Role: High-stability front-end amplifier feeding analog integrator in hybrid analog-digital thermal servo loop. Use Value: Excellent long-term stability eliminates need for periodic factory recalibration - extends field service interval to >5 years. |
Use Scenario: Controlling temperature of 5W–10W pump lasers in fiber amplifiers where thermal runaway must be prevented below 100ms. IC Role / Device Role / Timing Role: Fast-response current-difference detector enabling <100µs fault detection via IO monitoring path. Use Value: ±12.5µA output current range with 200kΩ RG yields 2.5V full-scale - matches standard DAC output ranges for seamless integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermistor signal amplification applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA326AIDGSR | Instrumentation amplifier requiring full Wheatstone bridge (3 precision resistors); no integrated excitation buffers or current conveyor. | Used in high-accuracy lab-grade thermistor meters; not optimized for TEC control loop bandwidth or low-power optical modules. | Select when absolute bridge-linearity >0.001% is required and board space allows discrete excitation circuitry. |
| AD8420ARMZ | Zero-drift instrumentation amplifier with 10µV offset; no built-in thermistor excitation or current-difference architecture. | Suitable for generic ratiometric sensor interfaces; lacks VEXCITE, Enable, and IO output needed for direct TEC controller integration. | Choose for multi-sensor platforms where shared excitation and flexible gain routing outweigh dedicated TEC optimization. |
Compared with INA330AIDGSR, INA326AIDGSR demands more external components and offers higher DC precision but slower response and no enable function, while AD8420ARMZ provides broader general-purpose performance but requires full external excitation and lacks the current-conveyor's inherent resistance-ratio rejection.
Availability
INA330AIDGSR is available at Aetrix Electronics and suitable for optical transceiver manufacturing, FTTx module assembly, coherent modem production, and high-reliability laser diode control systems requiring stable component supply across extended product lifecycles.
Supply support for INA330AIDGSR 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 decades of heritage in precision signal conditioning and industrial-grade IC design.
The INA330AIDGSR belongs to TI's precision thermistor amplifier product line, engineered specifically for optical networking temperature control where sub-degree stability, low 1/f noise, and minimal external component count are mandatory.
FAQ
What is the primary function of the INA330AIDGSR in a temperature control system?
The INA330AIDGSR functions as a dedicated thermistor signal amplifier that converts resistance differences between a 10kΩ thermistor and a precision reference resistor into a proportional output current (IO = I1 – I2), which is then converted to voltage via external RG. This architecture replaces traditional bridge circuits and enables high-accuracy, low-drift temperature set-point generation for TEC drivers in optical modules. The INA330AIDGSR is explicitly designed for this role and is not a general-purpose op amp or instrumentation amplifier.
Why must Pin 5 (V2) of the INA330AIDGSR be connected to V+?
Pin 5 (V2) of the INA330AIDGSR is an internal bias node required for proper operation of the voltage excitation buffers. The datasheet explicitly states "Pin 5 of the INA330 should be connected to V+ to ensure proper operation." Failure to make this connection results in undefined behavior, loss of excitation voltage regulation, and failure of the current-conveyor function. This is not optional - it is a mandatory hardware requirement specified in TI's SBOS260 datasheet, Figure 5, and Applications Information section.
Can the INA330AIDGSR operate from a 3.3V supply, and what design adjustments are needed?
Yes, the INA330AIDGSR supports supply voltages from +2.7V to +5.5V, including +3.3V operation. When using 3.3V, the VEXCITE output remains at +1V (within spec), but the output swing (VO) is reduced to within ~10mV of 3.3V rails, and the maximum usable RG value decreases proportionally to maintain compliance. Components such as the PID integrator op amp and DAC reference must be selected for 3.3V compatibility, and the VADJUST range should be scaled accordingly - e.g., 0V to 3.3V instead of 0V to 5V. The INA330AIDGSR itself requires no configuration change.
How does the INA330AIDGSR achieve 0.009°C temperature error over –40°C to +85°C?
The 0.009°C error arises from the INA330AIDGSR's current-conveyor offset error variation: ±40nA over temperature, referenced to a 10kΩ thermistor with –4.5%/°C coefficient (4500nA/°C change). The calculation is 40nA ÷ 4500nA/°C = 0.009°C. This is a measured production distribution value shown in Figure 1 (page 5 of SBOS260), not a theoretical estimate. The INA330AIDGSR's auto-zero architecture minimizes drift, and the error is fully characterized - it does not include contributions from RSET or thermistor tolerance, which are external to the INA330AIDGSR.
Is the INA330AIDGSR pin-compatible with other TI thermistor amplifiers like the INA326 or INA327?
No, the INA330AIDGSR is not pin-compatible with the INA326 or INA327. It uses a unique 10-pin MSOP (DGS) pinout optimized for its current-conveyor architecture, with dedicated pins for VEXCITE, IO, Enable, and forced V+ tie on Pin 5. In contrast, the INA326/INA327 are 8-pin SOIC or VSSOP devices with standard IN+/IN–/REF/OUT/VS+/VS–/GND/NC layouts. No TI datasheet claims pin compatibility between these families, and schematic symbol footprints differ fundamentally. Replacing one with another requires full PCB redesign.
INA330AIDGSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 kHz
- Current - Input Bias:
- 200 pA
- Voltage - Input Offset:
- 60 µV
- Current - Supply:
- 2.6mA
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VSSOP
INA330AIDGSR FAQ
1.How can I place an order for INA330AIDGSR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA330AIDGSR 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 INA330AIDGSR reliable?
The price and inventory of INA330AIDGSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA330AIDGSR is usually 5 days.
3.What payment methods are accepted for INA330AIDGSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA330AIDGSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA330AIDGSR?
INA330AIDGSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA330AIDGSR 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 INA330AIDGSR?
For technical support, including INA330AIDGSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA330AIDGSR requirements.
6.How does Aetrix verify that INA330AIDGSR is sourced from the original manufacturer or authorized distributors?
All INA330AIDGSR 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 INA330AIDGSR meets industry standards.
7.What is the process for return or replacement of INA330AIDGSR?
All INA330AIDGSR units undergo pre-shipment inspection (PSI). If there is an issue with INA330AIDGSR, 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 INA330AIDGSR part is unused and in its original packaging.
Return procedure for INA330AIDGSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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