ADS114S08BIRHBR - 16-bit 4kSPS 12-ch Delta-Sigma ADC | Texas Instruments
MPN: ADS114S08BIRHBR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.16 | $6.16 |
| 10 | $5.65 | $56.50 |
| 100 | $4.95 | $495.00 |
| 500 | $4.4 | $2,200.00 |
| 1,000 | $3.95 | $3,950.00 |
ADS114S08BIRHBR Overview
A delta-sigma ADC is a type of analog-to-digital converter that uses oversampling and noise shaping to achieve high resolution at low sample rates. Delta-sigma ADCs are a subset of integrating ADCs, which fall under the broader category of data converters, mixed-signal ICs, and finally semiconductors. The ADS114S08B sits in this taxonomy between precision SAR ADCs (single-shot, medium speed) and wideband pipeline ADCs (high speed, lower resolution). Delta-sigma converters dominate low-frequency precision measurement - sensor signal conditioning, weigh scales, temperature, strain gauge bridges - because their noise-shaping topology yields 16-24 effective bits at bandwidths below a few kHz.
Key features include 12 analog input channels with low-noise PGA gains of 1, 2, 4, 8, 16, 32, 64, and 128, programmable data rates from 2.5 SPS to 4 kSPS, simultaneous 50-Hz and 60-Hz line rejection at data rates up to 20 SPS, an integrated 2.5 V low-drift voltage reference, and two matched excitation current sources for RTD and bridge sensor biasing. The device offers low-latency digital filter response, an SPI-compatible serial data interface, and an operating supply current as low as 280 µA in low-power mode.
Architecture-wise, the ADS114S08B uses a 2nd-order delta-sigma modulator followed by a programmable SINC + FIR digital decimation filter. The modulator clock is derived from an internal oscillator; the digital filter provides both single-cycle and FIR modes. The integrated PGA delivers gains up to 128 V/V, allowing direct interface to thermocouples and strain-gauge bridges without external instrumentation amplifiers. The integrated low-drift 2.5 V reference eliminates an external reference IC for cost-sensitive designs.
Typical applications include weigh scales and load cell digitizers, RTD and thermocouple temperature acquisition, strain-gauge bridge measurement, industrial process control analog input modules, factory automation sensor interfaces, and battery-powered portable sensor instruments. The 280 µA quiescent current makes it well suited for battery-powered or loop-powered 4-20 mA sensor transmitters where total analog-section power budget is constrained.
When designing with the ADS114S08B, allocate GPIO on the host microcontroller for /DRDY, /CS, SCLK, DIN, DOUT/DRDY, and /RESET. Use a clean low-noise analog supply with a ferrite bead separating it from the digital 3.3 V rail. Place the 0.10 µF + 10 µF decoupling pair within 5 mm of the AVDD pin. The exposed thermal pad (pin 33) must be soldered to a continuous analog ground plane for thermal and EMI performance.
Drop-in alternatives for ADS114S08BIRHBR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS114S08BIRHBT
✅ Drop-In📋 Reference alternative (not in catalog)
ADS114S06BIRHBR
✅ Drop-In📋 Reference alternative (not in catalog)
ADS114S08BIRHBR Maximum Ratings & Electrical Characteristics
| Resolution | 16 bit |
| Number of Input Channels | 12 |
| Architecture | Delta-Sigma |
| Maximum Sample Rate | 4 kSPS |
| Minimum Sample Rate | 2.5 SPS |
| Programmable Gain | 1, 2, 4, 8, 16, 32, 64, 128 V/V |
| Input Type | Differential / Single-ended |
| Data Interface | SPI-compatible (serial) |
| Integrated Voltage Reference | 2.5 V (low-drift) |
| Excitation Current Sources | 2 matched IDACs |
| 50/60 Hz Rejection | Simultaneous, at data rates up to 20 SPS |
| Quiescent Current | 280 µA (low-power mode) |
| Analog Supply Voltage (AVDD) | 2.7 V to 5.25 V |
| Digital Supply Voltage (DVDD) | 1.65 V to 3.6 V |
| Operating Temperature Range | -40 °C to +125 °C |
| Package | 32-pin VQFN (RHB) 5x5 mm with thermal pad |
| Mounting Type | Surface Mount |
| MSL Level | 2 |
| RoHS Status | Compliant |
ADS114S08BIRHBR Pin Configuration
| Pin 1 | AVDD — Analog supply voltage (2.7 V to 5.25 V) |
| Pin 2 | AVSS — Analog ground reference |
| Pin 3 | REFN — External reference negative input |
| Pin 4 | REFP — External reference positive input |
| Pin 5 | AIN0 — Analog input 0 (positive PGA input) |
| Pin 6 | AIN1 — Analog input 1 (negative PGA input) |
| Pin 7 | AIN2 — Analog input 2 |
| Pin 8 | AIN3 — Analog input 3 |
| Pin 9 | AIN4 — Analog input 4 |
| Pin 10 | AIN5 — Analog input 5 |
| Pin 11 | AIN6 — Analog input 6 |
| Pin 12 | AIN7 — Analog input 7 |
| Pin 13 | AIN8 — Analog input 8 |
| Pin 14 | AIN9 — Analog input 9 |
| Pin 15 | AIN10 — Analog input 10 |
| Pin 16 | AIN11 — Analog input 11 |
| Pin 17 | IDAC1 — Excitation current source 1 output |
| Pin 18 | IDAC2 — Excitation current source 2 output |
| Pin 19 | GPIO0 — General-purpose I/O 0 |
| Pin 20 | GPIO1 — General-purpose I/O 1 |
| Pin 21 | GPIO3 — General-purpose I/O 3 |
| Pin 22 | GPIO2 — General-purpose I/O 2 |
| Pin 23 | CLKSEL — Clock select input (internal/external) |
| Pin 24 | RESET — Active-low reset input |
| Pin 25 | DRDY — Data ready output (active low) |
| Pin 26 | CS — SPI chip select (active low) |
| Pin 27 | SCLK — SPI serial clock input |
| Pin 28 | DIN — SPI serial data input |
| Pin 29 | DOUT — SPI serial data output |
| Pin 30 | DVDD — Digital supply voltage (1.65 V to 3.6 V) |
| Pin 31 | DGND — Digital ground |
| Pin 32 | TEST — Test pin (tie to DVDD per datasheet) |
Typical Applications
ADS114S08BIRHBR is suitable for 6 applications: Weigh Scales and Load Cell Digitizers, RTD Temperature Acquisition Modules, Strain-Gauge Bridge Pressure Sensors, Industrial Process-Control Analog Input Modules, Battery-Powered Portable Sensor Instruments, Factory Automation Sensor Interfaces.
Weigh Scales and Load Cell Digitizers
The ADS114S08BIRHBR is well suited for weigh-scale and load-cell signal acquisition because its integrated low-drift 2.5 V reference and matched IDAC excitation sources provide a complete ratiometric bridge measurement solution. According to the TI datasheet, the integrated PGA with gains up to 128 V/V directly amplifies the low-level load-cell output (typically 1-3 mV/V) without external instrumentation amplifiers, reducing BOM cost. The 16-bit resolution and 4 kSPS maximum data rate, combined with selectable 10 SPS or 20 SPS rates that provide simultaneous 50 Hz and 60 Hz line-noise rejection, yield stable digitizer readings in electrically noisy factory environments. Typical design places a 350 Ω or 1 kΩ load cell on the bridge with the IDAC providing bias, the PGA set to gain 64 or 128, and the output data rate set to 10 SPS.
Recommended
RTD Temperature Acquisition Modules
The ADS114S08BIRHBR excels in 4-wire and 3-wire RTD temperature acquisition, where the two integrated matched IDAC excitation current sources eliminate the need for external precision current sources and the integrated PGA handles the small PT100/PT1000 voltage drop directly. According to the TI datasheet, simultaneous 50 Hz and 60 Hz mains-line rejection at 20 SPS eliminates power-line interference in industrial installations. The 16-bit resolution provides 0.1 °C temperature resolution over the industrial -200 °C to +850 °C PT100 span when paired with a reference resistor. Per-channel multiplexing allows the 12 inputs to scan 12 separate RTDs in a single module, ideal for multi-zone industrial temperature monitoring.
Recommended
Strain-Gauge Bridge Pressure Sensors
The ADS114S08BIRHBR is widely used in strain-gauge bridge pressure-sensor front ends because of its low-noise PGA and integrated ratiometric reference, which together provide a complete bridge-measurement solution. According to the TI datasheet, the PGA gains of 64-128 V/V amplify the small mV-level bridge output directly, while the 16-bit delta-sigma noise-shaping principle rejects low-frequency 1/f noise that dominates at strain-gauge output bandwidths. The 4 kSPS maximum data rate supports 1 kHz control-loop bandwidth pressure-sensor applications. Industrial process-control pressure transmitters and HVAC differential-pressure transducers are typical end products.
Recommended
Industrial Process-Control Analog Input Modules
The ADS114S08BIRHBR is ideal for multi-channel industrial analog input modules where a single ADC serves 8-12 sensor channels. The 12 analog inputs can be configured as differential or single-ended in any combination, allowing mixed voltage, RTD, and thermocouple channels on the same module. The simultaneous 50/60 Hz line-noise rejection at 20 SPS provides robust performance in electrically noisy industrial cabinets. The 280 µA quiescent current also makes the ADC well suited for 4-20 mA loop-powered smart sensor transmitters where total power dissipation is constrained. PLC analog input cards and distributed I/O modules are typical end applications.
Recommended
Battery-Powered Portable Sensor Instruments
The ADS114S08BIRHBR is highly suited for battery-powered portable sensor instruments, where its 280 µA quiescent current extends battery life significantly. According to TI datasheet, the low-power mode draws roughly 280 µA versus 1.2 mA in high-resolution mode, allowing trade-off between sample rate and battery runtime. Combined with the integrated PGA and reference, the ADC eliminates several external ICs, reducing both BOM cost and quiescent drain. Typical end products are handheld digital thermometers, portable data loggers, field-calibration instruments, and Bluetooth-connected sensor peripherals where months-to-years of battery life is a key requirement.
Recommended
Factory Automation Sensor Interfaces
The ADS114S08BIRHBR is well suited for factory-automation sensor interfaces such as industrial PLC analog input cards, distributed I/O modules, and machine-vision illumination controllers. The 12 input channels with on-chip PGA and reference, combined with simultaneous 50/60 Hz line-noise rejection, provide robust signal acquisition in industrial cabinets with motor drives and switching power supplies. The exposed thermal pad (pin 33) and 32-pin VQFN 5x5 mm footprint simplify thermal design at the high temperature industrial -40 °C to +125 °C operating range. SPI-compatible serial interface allows straightforward connection to industrial MCUs and FPGAs.
Recommended
Recommended Products Summary
Engineering reference data for ADS114S08BIRHBR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS114S08BIRHBT | ADS114S06BIRHBR | ADS114S08BIPW |
|---|---|---|---|---|
| Package | VQFN-32 (RHB) 5x5 mm | VQFN-32 (RHB) - same | VQFN-32 (RHB) - same | TSSOP-40 (different) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit |
| Number of Channels | 12 | 12 | 6 | 12 |
| Maximum Sample Rate | 4 kSPS | 4 kSPS | 4 kSPS | 4 kSPS |
| Programmable Gain | 1 to 128 V/V | 1 to 128 V/V | 1 to 128 V/V | 1 to 128 V/V |
| Integrated Reference | Yes (2.5 V) | Yes (2.5 V) | Yes (2.5 V) | Yes (2.5 V) |
| IDAC Current Sources | 2 matched | 2 matched | 2 matched | 2 matched |
| Quiescent Current | 280 µA | 280 µA | 280 µA | 280 µA |
| Reel Quantity | 3000 | 250 | 3000 | 3000 |
Key Differentiators
- 12 analog input channels in a 5x5 mm VQFN (vs ADS114S06BIRHBR)
- Integrated low-drift 2.5 V reference and matched IDACs (vs ADS1220IPW)
- Ultra-low 280 µA quiescent current (vs ADS1220IPW)
Design Notes
The ADS114S08BIRHBR requires separate analog (AVDD, 2.7-5.25 V) and digital (DVDD, 1.65-3.6 V) supplies. Place a 10 µF tantalum or ceramic + 0.10 µF ceramic decoupling pair within 5 mm of each supply pin. Use a ferrite bead between the AVDD rail and the system 3.3 V or 5 V rail to prevent digital switching noise from coupling into the analog front end. The exposed thermal pad (pin 32 / pin 33) must be soldered to a continuous analog-ground plane to provide thermal dissipation and a low-impedance analog ground reference. Estimated: at 280 µA quiescent current, the analog supply current is approximately 2.5 mW at 5 V AVDD.
Route analog input traces (AIN0-AIN11) as short and symmetrical differential pairs with the two traces matched in length and width. Keep digital SPI traces (CS, SCLK, DIN, DOUT, DRDY) away from analog input traces by 3x the trace-to-trace spacing to minimize digital-to-analog noise coupling. Use a single continuous analog ground plane beneath the ADC and route digital ground returns through a separate digital ground region, stitching them together only at the ADC's exposed thermal pad. Avoid running analog traces parallel to high-current switching traces; cross them at right angles only.
Do not leave the REF pin floating - either tie REFP to the internal 2.5 V reference and REFREFP/REFREFN together, or drive REFP/REFN with an external precision reference. Do not exceed the absolute maximum AVDD of 6 V or DVDD of 3.6 V - permanent damage will result. When using ratiometric RTD measurement with the IDAC, ensure the IDAC current magnitude is appropriate for the reference resistor to avoid saturating the PGA output (PGA output swing must stay within AVDD - 0.3 V and AVSS + 0.3 V).
The ADS114S08BIRHBR has an exposed thermal pad that must be soldered to the PCB ground plane for thermal performance. Estimated theta_JA for a JEDEC 4-layer board is approximately 35 °C/W. At 280 µA quiescent current the part dissipates less than 2 mW and thermal performance is not a concern. However, in designs where multiple ADCs share a small PCB region, ensure adequate copper pour to keep junction temperatures within the -40 °C to +125 °C operating range.
Compliance Information
RoHS and REACH compliant per TI product page. The ADS114S08BIRHBR is not AEC-Q100 qualified - for automotive applications, see ADS1120-Q1 or ADS1148-Q1 which require PCB rework. Lead-free and halogen-free per TI packaging specification.
