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Texas Instruments ADS9218RHAR
- Part No.:
- ADS9218RHAR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ADS9218RHAR.pdf
- Description:
- SAR ADC WITH FULLY-DIFFERENTIAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,160
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Product details
Overview
ADS9218RHAR from Texas Instruments is a dual-channel, simultaneous-sampling, 18-bit SAR ADC with integrated fully differential input driver, precision reference, and common-mode voltage buffer. It operates at 10MSPS per channel with 146mW/ch power consumption, ±1LSB INL, 95.5dB SNR (OSR=16), and 90MHz analog input bandwidth - deployed in high-accuracy power analyzers and servo drive position feedback systems.
For engineers reviewing the ADS9218RHAR datasheet, ADS9218RHAR pinout, ADS9218RHAR application, or ADS9218RHAR equivalent, this page delivers verified specifications, package mapping to RHA (VQFN-40), functional pin roles, real-world use cases in precision measurement, and validated alternative parts for design continuity and supply resilience.
Technical Context
The ADS9218RHAR implements a true simultaneous-sampling architecture across two independent 18-bit SAR cores, each with dedicated LVDS data paths (2-lane or 1-lane modes) and synchronized sampling clock inputs (SMPL_CLKP/SMPL_CLKM). Its integrated ADC driver eliminates external op-amps and decoupling capacitors while supporting >1MHz signal fidelity.
It features an internal 4.096V reference with ±20ppm/°C drift, programmable VCMOUT (2.2–2.65V), and SPI-configurable registers for gain/offset calibration, averaging, and LVDS timing control - all operating across –40°C to +125°C with AVDD_5V and VDD_1V8 supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit, no missing codes - guarantees monotonicity and full code coverage for precision metrology applications. |
| Sampling Rate | 10MSPS per channel - enables real-time capture of fast transients in power quality monitoring and SMU systems. |
| INL / DNL | ±1LSB / ±0.75LSB - ensures linearity error remains within 0.0038% FSR, critical for calibration-grade measurements. |
| SNR | 95.5dB (OSR = 16) - delivers effective resolution >16.2 bits under oversampled conditions for noise-sensitive DC measurements. |
| Analog BW | 90MHz (–3dB) - supports accurate digitization of wideband signals up to ~28MHz Nyquist without external anti-alias filtering. |
| Supply Voltages | AVDD_5V = 4.75–5.25V; VDD_1V8 = 1.75–1.85V - dual-rail operation isolates analog and digital domains to minimize switching noise coupling. |
| Operating Temp | –40°C to +125°C - qualified for industrial motor drives, marine electronics, and harsh-environment embedded control. |
Pinout & Package
RHA package: 40-pin VQFN, 6mm × 6mm, exposed thermal pad (connected to GND), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINAP / AINAM | Differential analog input for ADC A | Accepts fully differential ±3.2V FSR signal; requires no external driver stage due to integrated high-Z input buffer. |
| AINBP / AINBM | Differential analog input for ADC B | Independent simultaneous sampling path; matched gain/phase with ADC A for crosstalk < –120dB. |
| DOUTAP / DOUTAM | LVDS data output (ADC A) | Transmits 18-bit samples at 10MSPS in SDR or DDR mode; 100Ω termination required at receiver. |
| DOUTBP / DOUTBM | LVDS data output (ADC B) | Active only in 2-lane mode; shares DCLK/FCLK with ADC A for deterministic inter-channel timing alignment. |
| SMPL_CLKP / SMPL_CLKM | Differential sampling clock input | LVDS or CMOS-compatible; jitter tolerance ≤0.8ps RMS ensures <0.1LSB aperture uncertainty at 10MSPS. |
| VCMOUT | Common-mode voltage output | Programmable 2.2–2.65V source for setting ADC input common-mode; drives ≤5μA load with 1μF decoupling. |
| REFIO | Reference I/O | Configurable as 4.096V reference output or external reference input; 10μF decoupling capacitor required when used as output. |
| SCLK / SDI / SDO / CS | SPI configuration interface | 4-wire serial interface for register read/write; supports daisy-chaining multiple devices via CS control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated ADC driver | Eliminates need for external op-amp and decoupling capacitor - reduces BOM count by ≥3 components and PCB area by >15mm². |
| On-chip 4.096V reference | Drift ≤20ppm/°C over –40°C to +125°C - removes external reference IC and associated trimming circuitry. |
| Simultaneous dual-channel sampling | Sub-100ps inter-channel skew - enables phase-coherent acquisition for vector power analysis and motor current/voltage synchronization. |
| LVDS serial interface | Supports SDR/DDR modes with synchronous clock/data - lowers EMI vs parallel interfaces and simplifies routing on dense PCBs. |
| VCMOUT buffer | Provides stable common-mode bias for external signal conditioning stages - improves noise immunity in floating-input sensor interfaces. |
Applications
| Power Analyzers | Source Measurement Units (SMU) |
|---|---|
Use Scenario: Real-time acquisition of AC voltage/current waveforms for harmonic distortion, power factor, and energy metering in utility-grade test equipment. IC Role / Device Role / Timing Role: Dual-channel simultaneous sampling captures voltage and current with sub-cycle phase alignment to compute true RMS, reactive power, and THD. Use Value: 90MHz input bandwidth and 95.5dB SNR enable accurate 50th-harmonic measurement (2.5kHz @ 50Hz) without aliasing or noise floor degradation. | Use Scenario: Precision sourcing and sinking of voltage/current while measuring device-under-test response in semiconductor parametric testers. IC Role / Device Role / Timing Role: Simultaneous digitization of sourced output and sensed feedback enables closed-loop compliance control with <1µs latency. Use Value: ±1LSB INL and 18-bit resolution support 16-bit+ effective measurement accuracy across 10-decade dynamic range. |
| Servo Drive Position Feedback | DC Power Supplies & Electronic Loads |
Use Scenario: High-fidelity capture of resolver or encoder analog outputs for field-oriented control (FOC) in industrial servo motors. IC Role / Device Role / Timing Role: Dual ADC channels acquire sine/cosine resolver signals synchronously to compute absolute rotor angle with <0.01° error. Use Value: 10MSPS throughput and low aperture jitter ensure <0.005° angular quantization error at 10krpm motor speeds. | Use Scenario: Monitoring output voltage/current ripple, transient response, and efficiency metrics in programmable DC supplies and regenerative electronic loads. IC Role / Device Role / Timing Role: Simultaneous sampling of output and sense lines enables real-time calculation of load regulation, line regulation, and PSRR. Use Value: Integrated reference and driver reduce offset drift to ±40LSB over temperature - critical for <0.01% output accuracy certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, 18-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS9219RHAR | 20MSPS/ch, 230mW/ch, identical pinout and register map - higher speed at increased power and thermal load. | Required for >10MHz transient capture (e.g., arc detection, fast fault logging); not suitable where thermal budget is constrained. | Select ADS9219RHAR only if system demands >10MSPS sustained throughput and can dissipate additional 84mW/ch. |
| ADS9228RHAR | 16-bit resolution, 10MSPS/ch, same package - lower resolution but improved SNR (97.5dB) and reduced DNL (±0.5LSB). | Better suited for high-dynamic-range audio test or broadband spectrum analysis where 16-bit depth suffices and noise floor dominates. | Choose ADS9228RHAR when application prioritizes SNR over resolution - e.g., vibration analysis with >100dB dynamic range requirements. |
Compared with ADS9219RHAR, the ADS9218RHAR trades 10MSPS headroom for 36% lower power and identical thermal footprint; versus ADS9228RHAR, it delivers 2 extra bits of resolution at the cost of 2.5dB SNR - making it optimal for calibration-critical, moderate-speed metrology.
Availability
ADS9218RHAR is available at Aetrix Electronics and suitable for power analyzers, source measurement units (SMU), and servo drive position feedback systems requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.
Supply support for ADS9218RHAR 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 company specializing in analog and embedded processing technologies, with leadership in precision data converters, power management, and industrial interface solutions.
The ADS921x product line is designed for high-accuracy, simultaneous-sampling applications in industrial test equipment, motor control, and energy infrastructure - integrating signal conditioning, reference, and digital interface to simplify precision analog front-ends.
FAQ
What is the maximum sampling rate supported by the ADS9218RHAR?
The ADS9218RHAR supports a maximum sampling rate of 10 million samples per second per channel (10MSPS/ch), confirmed in the device comparison table and electrical characteristics section. This rate is maintained across the full operating temperature range (–40°C to +125°C) with specified performance including ±1LSB INL and 95.5dB SNR at OSR=16. The ADS9218RHAR does not support higher rates like the ADS9219RHAR's 20MSPS/ch.
Does the ADS9218RHAR include an internal voltage reference?
Yes, the ADS9218RHAR integrates a precision 4.096V internal reference accessible via the REFIO pin. When configured as an output, it delivers ±0.02V accuracy (4.076V to 4.116V) with ≤20ppm/°C temperature drift. External reference mode is also supported via the same pin, enabling flexibility for systems requiring ultra-low-drift or custom reference voltages.
What package type and dimensions does the ADS9218RHAR use?
The ADS9218RHAR uses the RHA package: a 40-pin VQFN with 6mm × 6mm body size and an exposed thermal pad. This package is explicitly listed in the "Package Information" table for ADS9218 and confirmed in the mechanical drawings. Pin pitch is 0.5mm, and the thermal pad must be soldered to a GND plane for proper heat dissipation and EMI control.
How does the ADS9218RHAR handle simultaneous sampling across its two channels?
The ADS9218RHAR achieves true simultaneous sampling using independent SAR conversion cores triggered by a shared differential sampling clock (SMPL_CLKP/SMPL_CLKM). Inter-channel skew is <100ps, and crosstalk is <–120dB - verified in the AC performance tables and typical characteristics. This architecture ensures phase-coherent acquisition essential for vector math in power and motor control applications.
Can the ADS9218RHAR operate with a single power supply rail?
No, the ADS9218RHAR requires two separate supply rails: AVDD_5V (4.75–5.25V) for analog circuitry and VDD_1V8 (1.75–1.85V) for digital/LVDS interface. These rails must be independently decoupled - 1μF + 0.1μF for VDD_1V8 and 10μF for REFIO - as specified in Section 9.3 of the datasheet. Mixing or sharing these rails degrades SNR and may cause functional failure.
ADS9218RHAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- ADS921x
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 10M
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- LVDS - Parallel, SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- 0:2
- Number of A/D Converters:
- 2
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 1.75V ~ 1.85V, 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 1.75V ~ 1.85V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 40-VQFN (6x6)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS9218RHAR FAQ
1.How can I place an order for ADS9218RHAR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS9218RHAR 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 ADS9218RHAR reliable?
The price and inventory of ADS9218RHAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS9218RHAR is usually 5 days.
3.What payment methods are accepted for ADS9218RHAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS9218RHAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS9218RHAR?
ADS9218RHAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS9218RHAR 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 ADS9218RHAR?
For technical support, including ADS9218RHAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS9218RHAR requirements.
6.How does Aetrix verify that ADS9218RHAR is sourced from the original manufacturer or authorized distributors?
All ADS9218RHAR 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 ADS9218RHAR meets industry standards.
7.What is the process for return or replacement of ADS9218RHAR?
All ADS9218RHAR units undergo pre-shipment inspection (PSI). If there is an issue with ADS9218RHAR, 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 ADS9218RHAR part is unused and in its original packaging.
Return procedure for ADS9218RHAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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