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Texas Instruments ADS1209SPW
- Part No.:
- ADS1209SPW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS1209SPW.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:120
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Product details
Overview
ADS1209SPW from Texas Instruments is a dual-channel, second-order delta-sigma (ΔΣ) modulator IC designed for high-accuracy current and position sensing in industrial motor control systems. It delivers 16-bit resolution, ±2.3V specified differential input range, and 86dB dynamic range at 10MHz modulator rate with internal 2.5V reference. Its TSSOP-24 package supports isolated analog front-end integration with FPGA or ASIC digital filtering.
For engineers reviewing the ADS1209SPW datasheet, ADS1209SPW pinout, ADS1209SPW application, or ADS1209SPW equivalent, key selection criteria include modulator clock flexibility (internal 20MHz RC oscillator or external 1–24MHz source), channel-to-channel isolation (>100dB), and guaranteed 13-bit linearity over –40°C to +105°C ambient operation.
Technical Context
The ADS1209SPW implements two independent, fully differential switched-capacitor ΔΣ modulators sharing a common clock domain. Each channel digitizes analog inputs into a 1-bit bitstream output (OUTA/OUTB) synchronized to CLKOUT, with modulator clock derived by dividing the selected source (CLKSEL = 0 for CLKIN; CLKSEL = 1 for internal oscillator) by two.
It features dual reference input buffers (REFINA/REFINB), programmable gain error (±0.5% FSR), and integrated 2.5V reference output (REFOUT) with ±20ppm/°C drift. Input impedance varies inversely with modulator clock frequency (e.g., ~100kΩ at 10MHz), requiring low-source-impedance signal conditioning for optimal INL and THD performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit effective resolution with Sinc3 filter and OSR = 256 - enables missing-code-free A/D conversion in precision measurement systems. |
| Differential Input Range | ±2.3V with 2.5V common-mode - matches standard isolated amplifier outputs and resolver interface signals without level-shifting. |
| Dynamic Range | 86dB at 20kHz digital filter bandwidth - supports high-fidelity current sensing in servo drives with >12-bit ENOB. |
| Modulator Clock Options | Internal 20MHz RC oscillator or external 1–24MHz source - allows system-level clock synchronization or standalone operation without external crystal. |
| Reference Output | 2.5V ±2.5% (2.45–2.55V), ±20ppm/°C drift - provides stable, buffered reference for both channels and external circuitry, reducing BOM count. |
| Operating Temperature | –40°C to +105°C ambient - qualified for under-hood motor control, industrial inverters, and harsh-environment process instrumentation. |
| Supply Voltages | AVDD = 4.5–5.5V (analog), BVDD = 2.7–5.5V (I/O) - supports mixed-voltage systems with separate analog/digital power domains and noise isolation. |
Pinout & Package
TSSOP-24 package (PW designation) with 0.65mm pitch, thermally enhanced for continuous operation up to +105°C ambient; requires AGND/BGND separation and local 0.1µF ceramic decoupling on all supply pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHA+, CHA– | Differential analog input channel A | High-impedance switched-capacitor inputs; full-scale range defined by VREFIN; require matched trace routing and low-Z drive for <±1.8 LSB INL. |
| CHB+, CHB– | Differential analog input channel B | Independent second modulator input; identical specs to CHA; enables simultaneous current and voltage sampling or dual-phase resolver decoding. |
| REFINA, REFINB | Reference voltage inputs per channel | Accept 0.5–2.6V reference; internally buffered; enable independent scaling or external precision reference injection per channel. |
| REFOUT | Analog output | 2.5V nominal reference source; capable of sourcing 10mA; must be decoupled to AGND with 0.1µF capacitor to maintain PSRR >82dB. |
| OUTA, OUTB | Digital outputs | 1-bit bitstream outputs (CMOS); timing-critical - require controlled-impedance traces to FPGA/ASIC; data valid relative to CLKOUT rising edge. |
| CLKOUT | Digital output | Divided clock output (fMOD/2); used as synchronous timing reference for external digital filter; jitter <100ps RMS ensures deterministic decimation. |
| CLKSEL | Digital input | Selects clock source: high = internal 20MHz RC oscillator; low = external CLKIN; must be stable before power-up for reliable initialization. |
| CLKIN | Digital input | External clock input (1–24MHz); tied to BVDD or BGND if unused; input capacitance 5pF limits trace length in high-frequency layouts. |
| AVDD, AGND (×5) | Power/ground | Multiple dedicated analog supply and ground pins minimize IR drop and improve PSRR; each AVDD requires individual 0.1µF decoupling to adjacent AGND. |
| BVDD, BGND | Power/ground | Dedicated I/O buffer supply; separates digital switching noise from analog section; enables 3V or 5V logic compatibility. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent ΔΣ modulators | Enables true simultaneous sampling of two analog signals (e.g., phase current + DC bus voltage) without inter-channel skew or crosstalk. |
| Integrated 2.5V reference with 10mA drive | Eliminates need for external reference IC in cost-sensitive designs; ±20ppm/°C drift ensures stable gain calibration across temperature. |
| Configurable clock architecture | Internal RC oscillator reduces BOM and layout complexity; external clock option supports deterministic timing in synchronized multi-device systems. |
| 100dB channel-to-channel isolation | Prevents coupling between high-dv/dt motor phases and sensitive analog inputs - critical for accurate three-phase current reconstruction. |
| Specified 13-bit linearity over full temperature range | Guarantees monotonicity and predictable error behavior in closed-loop control algorithms without per-unit calibration. |
Applications
| Motor Control | Current Measurement |
|---|---|
|
Use Scenario: Real-time phase current sampling in 3-phase PMSM/BLDC inverters for field-oriented control (FOC). IC Role / Device Role / Timing Role: Dual-channel modulator providing synchronized bitstreams for high-bandwidth current feedback; CLKOUT enables deterministic FPGA filter timing. Use Value: 86dB dynamic range and 100dB channel isolation ensure accurate torque ripple suppression and overcurrent protection within 1ms response window. |
Use Scenario: Isolated shunt-based current sensing in industrial servo drives and robotic joint controllers. IC Role / Device Role / Timing Role: Converts differential voltage across precision shunt resistor into noise-immune bitstream; REFOUT supplies reference to isolated amplifier stage. Use Value: ±2.3V input range matches typical 100mΩ shunt full-scale; 13-bit linearity eliminates need for per-unit gain calibration across temperature. |
| Resolver Interface | Industrial Process Control |
|
Use Scenario: Digitizing resolver sine/cosine outputs for high-accuracy rotor position estimation in aerospace actuators. IC Role / Device Role / Timing Role: Simultaneous sampling of sin/cos resolver signals using CHA+/CHA– and CHB+/CHB–; internal reference ensures ratio-metric accuracy. Use Value: 16-bit resolution and 85dB SNR at 5kHz enable sub-arcminute angular resolution; TSSOP-24 thermal rating supports convection-cooled enclosures. |
Use Scenario: High-stability analog input conditioning for pressure, temperature, and flow transmitters in hazardous area instrumentation. IC Role / Device Role / Timing Role: Front-end modulator in loop-powered 4–20mA smart transmitter; REFOUT powers sensor excitation and signal conditioning stages. Use Value: –40°C to +105°C operation and ±0.5% gain error guarantee long-term calibration stability in uncontrolled environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar delta-sigma modulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AMC1303M0510 | Single-channel, reinforced isolated modulator; 20-bit resolution but fixed 20MHz clock; no internal reference output. | Requires external reference and digital filter; suited for isolated current sensing where galvanic separation is mandatory. | Select when reinforced isolation (7000VPK) and higher resolution outweigh dual-channel capability and internal reference convenience. |
| ADS1208SPW | Single-channel variant of same family; identical pinout except CHB+/CHB–/REFINB removed; same electrical specs and TSSOP-24 package. | Reduces cost and PCB area for single-signal applications; shares same layout and firmware adaptation path. | Choose when only one analog channel is needed - simplifies design reuse and inventory management without sacrificing performance. |
Compared with AMC1303M0510, ADS1209SPW offers dual-channel parallel sampling and integrated reference but lacks reinforced isolation; versus ADS1208SPW, it doubles channel count at identical footprint and thermal profile - ideal for space-constrained dual-signal systems.
Availability
ADS1209SPW is available at Aetrix Electronics and suitable for motor control, current measurement, and resolver interface applications requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.
Supply support for ADS1209SPW 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 data converters and industrial interface solutions.
The ADS1209SPW belongs to TI's high-performance delta-sigma modulator product line, engineered specifically for demanding industrial measurement applications including motor control, current sensing, and resolver-to-digital conversion.
FAQ
What is the maximum external clock frequency supported by ADS1209SPW?
The ADS1209SPW accepts external clock frequencies from 1MHz to 24MHz on the CLKIN pin. At 24MHz, the resulting modulator clock is 12MHz, enabling higher output data rates at the expense of reduced oversampling ratio and dynamic range. Operation beyond 24MHz is not characterized and may violate timing specifications.
Does ADS1209SPW require an external crystal or oscillator?
No, ADS1209SPW does not require an external crystal or oscillator. It includes an internal 20MHz RC oscillator that can be selected via the CLKSEL pin. An external clock is optional and only needed when system-level synchronization or tighter frequency stability is required.
Can ADS1209SPW operate with separate analog and digital supply voltages?
Yes, ADS1209SPW supports independent analog (AVDD) and I/O buffer (BVDD) supplies. AVDD ranges from 4.5V to 5.5V for analog circuitry, while BVDD operates from 2.7V to 5.5V for digital outputs - enabling mixed-voltage system integration and improved noise isolation.
What is the purpose of the multiple AGND and AVDD pins on ADS1209SPW?
The five AVDD and four AGND pins on ADS1209SPW reduce power supply impedance and improve PSRR by distributing current paths and minimizing shared trace inductance. Each AVDD pin must be decoupled locally to its adjacent AGND with a 0.1µF ceramic capacitor to maintain 86dB dynamic range performance.
How does the input impedance of ADS1209SPW vary with clock frequency?
ADS1209SPW input impedance is inversely proportional to modulator clock frequency (ZIN ≈ 100kΩ × 10MHz / fMOD). At 10MHz modulator clock, ZIN ≈ 100kΩ; at 5MHz, it rises to ~200kΩ. High source impedance degrades INL and THD, so signal sources should present <1kΩ to maintain specified 13-bit linearity.
ADS1209SPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 40k
- Number of Inputs:
- 2
- Input Type:
- Differential, Single Ended
- Data Interface:
- Serial
- Configuration:
- ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 24-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1209SPW FAQ
1.How can I place an order for ADS1209SPW through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1209SPW 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 ADS1209SPW reliable?
The price and inventory of ADS1209SPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1209SPW is usually 5 days.
3.What payment methods are accepted for ADS1209SPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1209SPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1209SPW?
ADS1209SPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1209SPW 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 ADS1209SPW?
For technical support, including ADS1209SPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1209SPW requirements.
6.How does Aetrix verify that ADS1209SPW is sourced from the original manufacturer or authorized distributors?
All ADS1209SPW 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 ADS1209SPW meets industry standards.
7.What is the process for return or replacement of ADS1209SPW?
All ADS1209SPW units undergo pre-shipment inspection (PSI). If there is an issue with ADS1209SPW, 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 ADS1209SPW part is unused and in its original packaging.
Return procedure for ADS1209SPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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