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Texas Instruments INA330AIDGST
- Part No.:
- INA330AIDGST
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA330AIDGST.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:589
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Product details
Overview
INA330AIDGST from Texas Instruments is a precision thermistor signal amplifier optimized for 10kΩ thermistor-based temperature control in optical networking TEC (thermoelectric cooler) systems. It implements a current-conveyor topology with single-precision-resistor excitation, delivers ±12.5µA output current, achieves 0.009°C temperature error over –40°C to +85°C, and operates from +2.7V to +5.5V supply.
For engineers reviewing the INA330AIDGST datasheet, INA330AIDGST pinout, INA330AIDGST application, or INA330AIDGST equivalent, key selection criteria include its thermistor excitation accuracy, low 1/f noise (500pAp-p, 0.01Hz–10Hz), rail-to-rail output swing (within 10mV of rails), and MSOP-10 package compatibility with high-density optical module layouts.
Technical Context
The INA330AIDGST integrates auto-zeroed voltage excitation buffers, a precision current conveyor (IO = I1 – I2), and a buffered voltage output stage. Its internal charge pumps enable voltage compliance beyond supply rails (±20mV negative, +100mV positive), supporting stable operation with external gain-setting resistor RG.
It uses internal 90kHz oscillator-driven auto-correction circuitry to suppress 1/f noise and offset drift, achieving ±0.2µV/°C input offset drift and ±40nA current offset variation over temperature - directly enabling sub-0.01°C set-point stability in closed-loop TEC control.
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. |
| Output Current Range | ±12.5µA - sets minimum RG value (e.g., 200kΩ yields ±2.5V output swing) without saturation. |
| Temperature Error | 0.009°C over –40°C to +85°C - enables high-accuracy laser diode thermal stabilization without calibration. |
| 1/f Noise (0.01Hz–10Hz) | 500pAp-p - contributes only 0.0001°C peak-to-peak temperature uncertainty in PID loops. |
| Input Offset Voltage | ±60µV max - auto-zeroed excitation buffers minimize thermistor measurement error at low ∆R. |
| Enable Pin Thresholds | Logic HIGH ≥1.6V, LOW ≤0.25V - compatible with standard CMOS logic for power-gated thermal control. |
| Bandwidth (–3dB) | 1kHz - sufficient for slow thermal dynamics while rejecting high-frequency EMI in optical enclosures. |
Pinout & Package
INA330AIDGST is housed in a 10-pin VSSOP (MSOP-10) package per JEDEC MO-187, with 0.5mm pitch, 3.05mm × 3.05mm body, and 1.1mm max height - optimized for space-constrained optical transceiver modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (I1) | Thermistor current sink | Connects to RTHERM (10kΩ thermistor); carries I1 proportional to thermistor resistance. |
| 2 (V+) | Positive supply | Primary power rail; pin 5 must be connected to V+ for proper internal biasing. |
| 3 (VO) | Voltage output | Buffered output proportional to (I1 – I2) × RG; swings within 10mV of V+ or GND. |
| 4 (IO) | Current output | Direct current conveyor output (IO = I1 – I2); connects to external RG for voltage conversion. |
| 5 (GND) | Ground reference | Must be tied to V+ per datasheet Figure 5; not functional ground - internal bias node. |
| 6 (Enable) | Shutdown control | CMOS-compatible input; LOW disables device, reducing quiescent current to 2–5µA. |
| 7 (I2) | Precision resistor current sink | Connects to RSET (10kΩ); carries I2 used as reference for thermistor current difference. |
| 8 (V2) | Excitation voltage buffer 2 | Provides stable 1V excitation to RSET; matched to V1 for common-mode rejection. |
| 9 (V1) | Excitation voltage buffer 1 | Provides stable 1V excitation to RTHERM; auto-zeroed to match V2 within ±30µV. |
| 10 (VEXCITE) | Excitation reference | Internal 1V reference node; not externally accessible - sets V1/V2 excitation level. |
Key Features
| Feature | Design Value |
|---|---|
| Single-precision-resistor topology | Eliminates need for two matched resistors in bridge circuits - reduces BOM cost and layout area by 30%. |
| Auto-zeroed excitation buffers | ±30µV offset match between V1 and V2 minimizes common-mode error in thermistor resistance ratio measurement. |
| Low 1/f noise architecture | 0.0001°C p-p noise contribution (0.01Hz–10Hz) ensures stable set-point in PID-controlled TEC loops. |
| Rail-to-rail output swing | Within 10mV of V+ or GND at 10kΩ load - maximizes dynamic range for analog feedback to TEC drivers. |
| Integrated enable function | Reduces supply current from 2.6mA to 2µA in shutdown - enables power cycling during optical module sleep modes. |
Applications
| Laser Diode Temperature Control | Optical Transceiver Thermal Stabilization |
|---|---|
|
Use Scenario: Maintaining constant junction temperature of DFB/FP laser diodes in SFP+/QSFP modules under ambient fluctuations. IC Role / Device Role / Timing Role: Thermistor signal amplifier generating precise voltage proportional to thermistor resistance deviation for PID loop input. Use Value: Enables <0.01°C set-point stability over –40°C to +85°C, preserving wavelength accuracy and minimizing bit-error-rate drift. |
Use Scenario: Closed-loop temperature regulation of photonic integrated circuits (PICs) in coherent optical receivers. IC Role / Device Role / Timing Role: High-accuracy current-difference amplifier converting thermistor resistance change into analog control voltage for TEC driver. Use Value: Delivers 0.009°C temperature error without factory calibration - reduces test time and improves yield in high-volume optical assembly. |
| TEC Driver Interface Circuit | High-Stability Optical Pump Laser Control |
|
Use Scenario: Interfacing thermistor feedback to linear TEC drivers (e.g., OPA569) or PWM drivers (e.g., DRV593) in DWDM line cards. IC Role / Device Role / Timing Role: Precision analog front-end providing low-noise, rail-to-rail output to drive TEC driver input with minimal gain error (±0.2%). Use Value: Output swing within 10mV of rails ensures full utilization of TEC driver input range, improving thermal response linearity. |
Use Scenario: Stabilizing pump laser diodes in erbium-doped fiber amplifiers (EDFAs) where temperature-induced wavelength shift degrades gain flatness. IC Role / Device Role / Timing Role: Low-drift thermistor amplifier with <0.2µV/°C offset drift, referenced to stable 2.5V VADJ for absolute temperature set-point. Use Value: Enables ±0.001°C resolution via 12-bit DAC-adjusted VADJ, meeting ITU-T G.698.2 spectral stability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermistor signal amplification applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA326AIDGKR | Instrumentation amplifier requiring full Wheatstone bridge (3 precision resistors + thermistor); higher input offset (±100µV). | Used in legacy bridge-based designs; lacks integrated excitation buffers and current-conveyor output. | Select when reusing existing bridge sensor layouts or needing higher CMRR (>110dB) at DC. |
| AD8420ARMZ | Zero-drift instrumentation amplifier with 25µV max offset; no built-in thermistor excitation or current-conveyor topology. | Requires external excitation circuitry and precision resistor network; wider bandwidth (1.5MHz) but higher noise density. | Select for general-purpose precision differential measurement where thermistor excitation is handled separately. |
Compared with INA330AIDGST, INA326AIDGKR demands more external components and calibration effort, while AD8420ARMZ offers superior DC precision but requires added circuitry for thermistor biasing - making INA330AIDGST uniquely optimized for minimal-component, high-stability TEC control.
Availability
INA330AIDGST is available at Aetrix Electronics and suitable for optical transceivers, laser diode modules, and DWDM line card thermal management requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle continuity.
Supply support for INA330AIDGST 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 expertise in precision signal conditioning and optical infrastructure solutions.
The INA330AIDGST belongs to TI's precision thermistor amplifier product line, designed specifically for high-accuracy, low-drift temperature control in optical networking equipment - addressing the demand for sub-0.01°C thermal stability in next-generation coherent transceivers.
FAQ
What is the primary function of the INA330AIDGST in optical networking systems?
The INA330AIDGST serves as a dedicated thermistor signal amplifier for thermoelectric cooler (TEC) control loops. It converts resistance changes in a 10kΩ thermistor into a precise voltage output using a current-conveyor architecture. In optical networking, this enables stable laser diode temperature regulation - critical for maintaining wavelength accuracy and minimizing bit-error rates in SFP+, QSFP, and coherent modules. The INA330AIDGST achieves this with 0.009°C temperature error over –40°C to +85°C and ultra-low 1/f noise.
Why does the INA330AIDGST require pin 5 to be connected to V+?
Pin 5 on the INA330AIDGST is an internal bias node, not a ground terminal. The datasheet explicitly states it must be connected to V+ to ensure proper operation of internal charge pumps and auto-zero circuitry. Leaving pin 5 unconnected or grounding it disrupts internal voltage generation, causing output instability, increased offset error, and failure to achieve specified 0.009°C temperature accuracy. This requirement is unique to the INA330AIDGST's topology and differs from conventional op-amp grounding conventions.
Can the INA330AIDGST operate from a 3.3V supply, and what design considerations apply?
Yes, the INA330AIDGST supports supply voltages from +2.7V to +5.5V, including 3.3V operation. However, at 3.3V, the output voltage swing is reduced (within 10mV of rails → 0.01V to 3.29V), requiring adjustment of RG and VADJ to maintain desired loop gain and set-point range. Also, the 1V excitation buffers remain functional, but external filtering (e.g., CFILTER) may need recalibration to preserve 1kHz bandwidth and noise performance. TI confirms 3.3V use in Figure 6 notes, provided component values are scaled accordingly.
How does the INA330AIDGST achieve 0.009°C temperature error specification?
The 0.009°C error stems from the INA330AIDGST's 40nA maximum current offset variation over –40°C to +85°C, combined with a 10kΩ thermistor's typical –4.5%/°C coefficient. A 1°C thermistor temperature change produces ~4500nA current change; thus, 40nA offset variation translates to 40/4500 = 0.009°C set-point drift. This is verified in the "Sources of Errors" section (page 6) and confirmed by production distribution data showing ±40nA variation. The INA330AIDGST achieves this via auto-zeroed buffers and matched current mirrors - not through external calibration.
What is the role of the Enable pin (pin 6) in INA330AIDGST power management?
The Enable pin (pin 6) provides hardware-level shutdown control for the INA330AIDGST. Applying logic LOW (≤0.25V) disables the amplifier, reducing quiescent current from 2.6mA to 2–5µA - ideal for power-gating during optical module standby modes. Logic HIGH (≥1.6V) enables normal operation. The pin exhibits CMOS input characteristics (leakage <100nA) and must never be left floating. In always-on applications, pin 6 is typically tied to V+; its fast enable/disable times (75µs/100µs) support dynamic thermal control in burst-mode optical links.
INA330AIDGST 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:
- Active
- 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
INA330AIDGST FAQ
1.How can I place an order for INA330AIDGST through Aetrix?
Please submit a Request for Quotation (RFQ) for INA330AIDGST 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 INA330AIDGST reliable?
The price and inventory of INA330AIDGST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA330AIDGST is usually 5 days.
3.What payment methods are accepted for INA330AIDGST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA330AIDGST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA330AIDGST?
INA330AIDGST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA330AIDGST 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 INA330AIDGST?
For technical support, including INA330AIDGST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA330AIDGST requirements.
6.How does Aetrix verify that INA330AIDGST is sourced from the original manufacturer or authorized distributors?
All INA330AIDGST 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 INA330AIDGST meets industry standards.
7.What is the process for return or replacement of INA330AIDGST?
All INA330AIDGST units undergo pre-shipment inspection (PSI). If there is an issue with INA330AIDGST, 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 INA330AIDGST part is unused and in its original packaging.
Return procedure for INA330AIDGST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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