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Texas Instruments ADS1148IRHBR
- Part No.:
- ADS1148IRHBR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ADS1148IRHBR.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,294
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Product details
Overview
ADS1148IRHBR from Texas Instruments is a 16-bit, 2-kSPS delta-sigma analog-to-digital converter with integrated programmable gain amplifier (PGA), dual matched excitation current sources (IDACs), 8-channel analog multiplexer, internal 2.048-V reference, burnout detection, and 8 GPIOs - designed for high-accuracy RTD, thermocouple, and bridge sensor front ends in industrial process control.
For engineers reviewing the ADS1148IRHBR datasheet, ADS1148IRHBR pinout, ADS1148IRHBR application, or ADS1148IRHBR equivalent, this page delivers verified technical context, real-world timing and noise performance, GPIO configuration options, excitation current matching specs, and validated alternatives for sensor signal chain design.
Technical Context
The ADS1148IRHBR implements a third-order delta-sigma modulator with single-cycle settling digital filter, enabling fast channel cycling across its 8 analog inputs while maintaining simultaneous 50-Hz and 60-Hz rejection at 20 SPS. Its PGA supports gains from 1× to 128× with offset drift as low as 15 nV/°C at G=128.
It integrates two programmable IDACs (50–1500 µA, ±1% absolute error, ±0.2% mismatch) and burn-out current sources (0.5/2/10 µA), all referenced to AVSS. The device operates from unipolar (2.7–5.25 V) or bipolar (±2.5 V) analog supplies and includes internal temperature sensing, VREF/VDD monitoring, and SPI-compatible serial interface with DRDY/DOUT combined pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit, no missing codes - guarantees monotonicity and full-scale linearity for precision sensor digitization. |
| Data Rate | 5–2000 SPS - selectable in 10 discrete steps; 20 SPS enables simultaneous 50/60-Hz rejection without external notch filters. |
| PGA Gain Range | 1× to 128× - supports direct connection of low-level sensors (e.g., 100-Ω Pt100 RTDs, mV-range thermocouples) without external amplification. |
| IDAC Matching | ±0.2% absolute mismatch between IEXC1 and IEXC2 - ensures balanced 4-wire RTD measurements with <0.01% resistance error contribution. |
| Internal Reference | 2.048 V ±5 mV (±20 ppm/°C drift) - eliminates need for external precision reference in cost-sensitive designs. |
| Input Channels | 8 independent analog inputs (AIN0–AIN7), each configurable as ADC input, excitation sink, or GPIO - enables flexible multi-sensor systems with shared IDACs. |
| GPIO Count | 8 general-purpose I/Os (GPIO0–GPIO7) - usable for sensor enable/disable, valve control, or status signaling without MCU pin overhead. |
Pinout & Package
ADS1148IRHBR is housed in a 32-pin VQFN package (5.0 mm × 5.0 mm, 0.5-mm pitch) with exposed thermal pad. Pin functions are defined per TI SBAS453G Rev G (August 2016).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DVDD | Digital power supply | 2.7–5.25 V supply for digital core and SPI interface; requires 0.1-µF decoupling to DGND. |
| AVDD / AVSS | Analog power rails | Unipolar (2.7–5.25 V) or bipolar (±2.5 V) operation; AVSS serves as analog ground reference for IDACs and burn-out sources. |
| AIN0–AIN7 | Configurable analog terminals | Each supports ADC input, excitation current sink (IEXC), or GPIO function - enables 4-wire RTD with dedicated AINx/IEXC pairs. |
| IEXC1 / IEXC2 | Dual matched excitation outputs | Programmable 50–1500 µA current sources with ±1% absolute accuracy and ±0.2% inter-channel mismatch. |
| REFP0/GPIO0 / REFN0/GPIO1 | Reference input or GPIO | Two pins serve dual role: external reference pair (REFP0/REFN0) or general-purpose I/Os - simplifies layout when internal VREF is used. |
| VREFOUT / VREFCOM | Internal reference outputs | 2.048-V regulated output (VREFOUT) and its complement (VREFCOM); require 1–47 µF capacitor between them for stability. |
| SCLK / DIN / DOUT/DRDY / CS | SPI interface signals | Standard 4-wire SPI with DRDY asserted on conversion completion; DOUT/DRDY pin combines data output and ready flag to save MCU pins. |
| START / RESET | Control inputs | Hardware START initiates conversion; RESET forces known state - both active-low, compatible with 3.3-V or 5-V logic. |
Key Features
| Feature | Design Value |
|---|---|
| Single-cycle settling filter | Enables full 16-bit settling within one data rate period - allows rapid scanning of all 8 channels at 250 SPS without settling delay penalties. |
| Dual matched IDACs | 50–1500 µA range with ±0.2% mismatch - supports true 4-wire RTD measurement where lead resistance cancellation depends on current source symmetry. |
| Sensor burn-out detection | Three user-selectable current levels (0.5/2/10 µA) applied to AINx - detects open-circuit sensors before conversion, preventing erroneous readings. |
| Integrated system monitor | Real-time tracking of AVDD, DVDD, and internal VREF - triggers alert via GPIO or register flag when supply or reference deviates beyond ±5%. |
| On-chip temperature sensor | 118 mV output at 25°C, 405 µV/°C sensitivity - provides local die temperature for gain/offset compensation or ambient monitoring without external sensor. |
Applications
| RTD Temperature Monitoring | Thermocouple Signal Conditioning |
|---|---|
|
Use Scenario: Continuous 4-wire Pt100 RTD measurement in HVAC duct sensors with 0.1°C resolution requirement over –40°C to +125°C. IC Role / Device Role: Primary ADC front end with integrated PGA, dual IDACs, burn-out detection, and internal reference - replaces discrete op-amp, reference, and excitation circuitry. Use Value: Eliminates external precision reference and matched current sources; ±0.2% IDAC mismatch contributes <0.01% error to resistance calculation. |
Use Scenario: Isolated K-type thermocouple reading in industrial burner control, requiring cold-junction compensation and 50/60-Hz line rejection. IC Role / Device Role: Delta-sigma ADC with programmable gain, internal temperature sensor (for CJC), and simultaneous 50/60-Hz rejection at 20 SPS. Use Value: Single-chip solution achieves <1 LSB INL at 20 SPS with no external notch filters; internal VBIAS simplifies thermocouple biasing. |
| Resistive Bridge Pressure Sensing | Multi-Channel Process Controller |
|
Use Scenario: 3.3-mV/V bridge output from MEMS pressure sensor in medical infusion pump, requiring 16-bit resolution and ratiometric accuracy. IC Role / Device Role: PGA-configured ADC using bridge excitation as reference (REFP1/REFN1) - enables true ratiometric measurement immune to supply variation. Use Value: PGA gain of 128× amplifies 3.3-mV/V signal to full-scale; internal 2.048-V reference ensures stable scaling without external components. |
Use Scenario: Compact PLC module acquiring temperature (RTD), pressure (bridge), flow (pulse), and status (digital I/O) from 8 field devices. IC Role / Device Role: Central sensor hub with 8 analog inputs, 8 GPIOs, system monitoring, and SPI interface - reduces MCU peripheral count and PCB area. Use Value: All 8 AINx pins double as GPIOs or IDAC sinks; VREFOUT powers external circuitry, reducing need for auxiliary regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision sensor ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1147IPWR | 4-input mux (vs. 8), same PGA, IDACs, reference, and GPIO count (4 vs. 8); TSSOP-20 package. | Limited to ≤4 sensor channels; lower pin count eases routing but restricts scalability. | Select when system uses ≤4 analog sensors and board space favors TSSOP over VQFN. |
| AD7124-8BCPZ | 24-bit resolution, 19.2 kSPS max, 8 differential inputs, integrated PGA and reference; SPI interface; no GPIOs. | Higher resolution and speed, but lacks GPIOs, burn-out detection, and dual IDACs - requires external circuitry for RTD excitation. | Choose for ultra-high-precision applications where 24-bit resolution outweighs loss of integrated sensor-specific features. |
Compared with ADS1147IPWR, ADS1148IRHBR adds 4 extra analog/GPIO channels and larger VQFN thermal performance; versus AD7124-8BCPZ, it trades raw resolution for integrated excitation, burn-out, and GPIO functionality - making it more complete for RTD/thermocouple systems with tight BOM constraints.
Availability
ADS1148IRHBR is available at Aetrix Electronics and suitable for industrial process controllers, factory automation I/O modules, and medical sensor interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADS1148IRHBR 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 acquisition and industrial signal chain solutions.
The ADS114x family was designed specifically for high-accuracy sensor measurement in harsh industrial environments - integrating PGA, IDACs, reference, burn-out detection, and GPIOs to minimize external components in RTD, thermocouple, and bridge applications.
FAQ
What is the maximum data rate supported by the ADS1148IRHBR?
The ADS1148IRHBR supports data rates from 5 SPS up to 2000 SPS in 10 discrete steps. At 2000 SPS, the delta-sigma modulator maintains 16-bit effective resolution with single-cycle settling, enabling rapid channel scanning across its 8 analog inputs without settling delay penalties. This makes ADS1148IRHBR suitable for dynamic multi-sensor monitoring where response time matters.
Does the ADS1148IRHBR include an internal voltage reference?
Yes, the ADS1148IRHBR integrates a precision 2.048-V internal voltage reference with ±5 mV initial accuracy and ±20 ppm/°C drift over –40°C to +105°C. It provides VREFOUT and VREFCOM outputs requiring a 1–47 µF capacitor between them. This eliminates the need for an external reference in most sensor applications, reducing BOM cost and board area - a key advantage of ADS1148IRHBR over basic ADCs.
How many GPIOs does the ADS1148IRHBR support, and what are their roles?
The ADS1148IRHBR provides 8 general-purpose I/Os (GPIO0–GPIO7), mapped to REFP0/GPIO0, REFN0/GPIO1, and AIN2–AIN7 pins. Each can be configured as input, output, or open-drain under register control. These GPIOs support sensor enable/disable, alarm signaling, or status indication - reducing MCU pin usage. Unlike simpler ADCs, ADS1148IRHBR integrates these directly into its sensor-focused architecture.
Can the ADS1148IRHBR perform simultaneous 50-Hz and 60-Hz rejection?
Yes, the ADS1148IRHBR's digital filter provides simultaneous 50-Hz and 60-Hz rejection at data rates of 20 SPS or lower. This is achieved through its notch-filter characteristic built into the single-cycle settling sinc³ filter - eliminating the need for external hardware notch filters or firmware-based digital filtering. This capability is explicitly confirmed in the ADS1148IRHBR datasheet and is critical for noise immunity in industrial AC-powered environments.
What are the excitation current source specifications for the ADS1148IRHBR?
The ADS1148IRHBR includes two matched programmable excitation current sources (IEXC1/IEXC2) with settings from 50 µA to 1500 µA. Each has ±1% absolute error and ±0.2% inter-channel mismatch over temperature. Compliance voltage is specified in TI's Figure 9 and Figure 10, supporting typical RTD excitation loads. These IDACs are core to ADS1148IRHBR's sensor integration - enabling precise 4-wire resistance measurements without external current sources.
ADS1148IRHBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 2k
- Number of Inputs:
- 4, 7
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 32-VQFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1148IRHBR FAQ
1.How can I place an order for ADS1148IRHBR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1148IRHBR 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 ADS1148IRHBR reliable?
The price and inventory of ADS1148IRHBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1148IRHBR is usually 5 days.
3.What payment methods are accepted for ADS1148IRHBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1148IRHBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1148IRHBR?
ADS1148IRHBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1148IRHBR 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 ADS1148IRHBR?
For technical support, including ADS1148IRHBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1148IRHBR requirements.
6.How does Aetrix verify that ADS1148IRHBR is sourced from the original manufacturer or authorized distributors?
All ADS1148IRHBR 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 ADS1148IRHBR meets industry standards.
7.What is the process for return or replacement of ADS1148IRHBR?
All ADS1148IRHBR units undergo pre-shipment inspection (PSI). If there is an issue with ADS1148IRHBR, 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 ADS1148IRHBR part is unused and in its original packaging.
Return procedure for ADS1148IRHBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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