ADS1245IDGSR - 24-Bit Delta-Sigma ADC, MSOP-10 | Texas Instruments
MPN: ADS1245IDGSR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.5 | $9.50 |
| 10 | $8.55 | $85.50 |
| 100 | $7.6 | $760.00 |
| 500 | $6.84 | $3,420.00 |
| 1,000 | $6.08 | $6,080.00 |
ADS1245IDGSR Overview
What is a delta-sigma ADC? A delta-sigma (ΣΔ) ADC is a converter architecture that uses oversampling and noise-shaping to deliver very high effective resolution at low-to-moderate sampling rates. It belongs to the broader class of ADCs (SAR, pipeline, dual-slope, ΣΔ) used wherever precision DC measurements are required. Within the power-management and signal-chain hierarchy, the ADS1245IDGSR sits between a low-impedance analog sensor bridge and a microcontroller's serial interface, providing digital-free-of-low-frequency-noise conversion.
Key features include 20-bit effective resolution, ±2.5 V differential input range, simultaneous 50 Hz and 60 Hz line-noise rejection, simple two-wire serial interface, and pin-compatibility with the ADS1244. The ADS1245 offers 0.0006% (typical) and 0.0015% (maximum) integral nonlinearity (INL), supporting demanding measurement accuracy requirements.
The architecture is built around a third-order delta-sigma modulator followed by a digital filter that performs simultaneous 50 Hz/60 Hz mains rejection at the appropriate output data rates. The buffered input simplifies front-end signal conditioning by eliminating the need for external op-amps when interfacing directly to high-impedance sensors such as strain gauges, thermocouples, or electrochemical cells.
Typical applications include precision temperature and pressure measurement, portable industrial weighing scales, weighing scales and load-cell conditioning, and process control instrumentation. The wide supply range also supports battery-powered handheld meters and 4-20 mA loop-powered industrial transmitters.
When designing with this device, place the input bypass capacitors as close to the AVDD/DVDD pins as possible and avoid routing the analog signals near the digital serial clock lines, because even high-PSRR ADCs can couple switching transients into the analog front-end.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers select and qualify the part rapidly.
Drop-in alternatives for ADS1245IDGSR — 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:
ADS1244IDGSR
✅ Drop-In📋 Reference alternative (not in catalog)
ADS1245IDGST
✅ Drop-In📋 Reference alternative (not in catalog)
ADS1245IDGS
✅ Drop-In📋 Reference alternative (not in catalog)
ADS1246IDGSR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADS1252IDGSR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADS1245IDGSR Maximum Ratings & Electrical Characteristics
| Resolution | 24 bit |
| Converter Type | Delta-Sigma |
| Number of Inputs | 1 |
| Differential Inputs | Yes |
| Input Type | Differential (high-impedance buffered, 3 GΩ) |
| Analog Supply Voltage (AVDD) | 2.5 V to 5.25 V |
| Digital Supply Voltage (DVDD) | 1.8 V to 3.6 V |
| Differential Input Range | ±2.5 V |
| Effective Resolution | 20 bits |
| Integral Non-Linearity (INL) | 0.0006% typ / 0.0015% max |
| Simultaneous 50 Hz/60 Hz Rejection | Yes |
| Digital Interface | 2-wire serial |
| Package | 10-pin MSOP (DGS) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Pin-Compatible With | ADS1244 |
ADS1245IDGSR Pin Configuration
| Pin 1 | AVDD — Analog power supply (2.5 V to 5.25 V) |
| Pin 2 | AINP — Differential analog input positive |
| Pin 3 | AINN — Differential analog input negative |
| Pin 4 | AVSS — Analog ground |
| Pin 5 | VREF — Voltage reference input |
| Pin 6 | AGND — Analog ground |
| Pin 7 | DRDY/DOUT — Data ready / serial data output |
| Pin 8 | DIN/SCLK — Serial data input / serial clock |
| Pin 9 | DVDD — Digital power supply (1.8 V to 3.6 V) |
| Pin 10 | DGND — Digital ground |
Typical Applications
ADS1245IDGSR is suitable for 6 applications: Precision Weigh Scales / Load Cells, Industrial Process Control / 4-20 mA Loop, Battery-Powered Handheld Instrumentation, Temperature / Thermocouple Measurement, Medical Patient Monitoring, Strain-Gauge Pressure Transducers.
Precision Weigh Scales / Load Cells
The ADS1245IDGSR is a strong fit for weigh-scale and load-cell signal conditioning. Its 24-bit delta-sigma architecture with 20-bit effective resolution digitises a strain-gauge bridge output down to microvolt-level resolution, and the 3 GΩ buffered input eliminates external instrumentation-amp buffers. When placed between a 5 V bridge-excitation rail and the MCU's serial port, the device delivers simultaneous 50 Hz/60 Hz mains rejection at the appropriate data rate, so 50 Hz and 60 Hz power-line noise is suppressed from the final weigh reading. In production weigh scales, the high INL (0.0006% typ) translates directly into grams-scale accuracy across the load-cell range, and the wide AVDD range (2.5 V-5.25 V) lets designers run from a single 5 V bridge supply.
Recommended
Industrial Process Control / 4-20 mA Loop
The ADS1245IDGSR suits industrial 4-20 mA process-control transmitters by offering a ±2.5 V differential input that natively accepts the bipolar voltage across a current-sense resistor. The high-z 3 GΩ input eliminates the input-current burden that drives unbuffered ADCs into gain error, and the 2.5 V minimum AVDD supports loop-powered transmitter designs deriving internal rails from the 4-20 mA loop drop. Designed into a 2-wire loop-powered transmitter head, the ADC draws only a few milliwatts and reports data over a 2-wire synchronous serial interface that MCU firmware can emulate or share with HART modems. The wide -40 °C to +85 °C industrial temperature window (to be confirmed against datasheet) and ±2.5 V full-scale input keep this part in the BOM for pH, conductivity, and flow-meter instrumentation.
Recommended
Battery-Powered Handheld Instrumentation
The ADS1245IDGSR enables battery-powered handheld instruments such as DMMs, clamp meters, and portable gas analyzers. Its low active current (a few mA depending on data rate) and power-down mode let designers stretch battery life across 8-hour work shifts, while the wide AVDD range (2.5 V-5.25 V) supports 2-cell and 3-cell lithium packs directly. Placed ahead of the MCU ADC, the buffered input tolerates the high-impedance probes used in portable DMMs without an external op-amp, reducing BOM cost and PCB area. Combined with a microcontroller in a 2-wire serial daisy chain, the ADC and MCU share I/O lines cleanly. The MSOP-10 footprint keeps the design slim enough to fit inside a handheld meter enclosure.
Recommended
Temperature / Thermocouple Measurement
The ADS1245IDGSR is well-matched to thermocouple and RTD front-ends because its 3 GΩ buffered input minimises measurement error when sourcing high-impedance thermocouple signals. The high effective resolution (20 noise-free bits) allows resolution of microvolt-level thermocouple Seebeck voltages, while 50/60 Hz simultaneous rejection removes mains-coupled noise commonly picked up by thermocouple leads. In a typical circuit the ADC digitises a K-type thermocouple output (≈40 µV/°C) with cold-junction compensation from a separate RTD channel, supporting 0.1 °C display resolution across -200 °C to +1300 °C. The 10-pin MSOP footprint frees board space around the screw-terminal thermocouple connectors.
Recommended
Medical Patient Monitoring
The ADS1245IDGSR serves medical bedside-monitor signal chains where 24-bit noise-free resolution and very low front-end current are needed for ECG, SpO2, and respiration measurement. The 3 GΩ buffered input keeps input bias current below the patient auxillary-current safety limits, and the wide supply range supports both 3.3 V and 5 V analog rails typical of medical PCBs. Positioned between a high-impedance analog front-end and a low-power MCU, the ADC delivers clean digitisation while consuming only a few milliwatts, helping meet IEC 60601-1 thermal and power budgets. Paired with a low-noise LDO and a small isolation barrier, the part fits inside patient-monitoring cables and bedside-cart assemblies.
Recommended
Strain-Gauge Pressure Transducers
The ADS1245IDGSR suits strain-gauge pressure transducer signal chains because its 0.0006% typical INL preserves the linearity of the bridge over the full pressure range. The ±2.5 V differential input accepts the small millivolt-level bridge output amplified by the ADC reference span, and the 2.5 V minimum AVDD lets the transducer run from a single 3.3 V supply. Mounted adjacent to a Wheatstone bridge and a precision 5 V reference, the ADC reports digital pressure readings through a 2-wire synchronous serial interface that an 8-bit MCU can easily decode. The MSOP-10 footprint accommodates the small cylindrical form factor of industrial pressure transducers where PCB area is constrained.
Recommended
Recommended Products Summary
Engineering reference data for ADS1245IDGSR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS1244IDGSR | ADS1245IDGST | ADS1245IDGS | ADS1246IDGSR | ADS1252IDGSR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | MSOP-10 (DGS) | MSOP-10 (DGS) - same | MSOP-10 (DGS) - same | MSOP-10 (DGS) - same | MSOP-10 (DGS) - same | MSOP-10 (DGS) - same |
| Resolution | 24-bit (20-bit effective) | 24-bit (20-bit effective) | 24-bit (20-bit effective) | 24-bit (20-bit effective) | 24-bit | 24-bit |
| Input Buffer | Yes (3 GΩ) | No (unbuffered) | Yes (3 GΩ) | Yes (3 GΩ) | Yes | Yes |
| Differential Input Range | ±2.5 V | ±2.5 V | ±2.5 V | ±2.5 V | ±2.5 V | ±2.5 V |
| AVDD Range | 2.5 V to 5.25 V | 2.5 V to 5.25 V | 2.5 V to 5.25 V | 2.5 V to 5.25 V | 2.5 V to 5.25 V | 5 V (typ) |
| Pin-Compatible | Standard | Yes - ADS1245 is drop-in upgrade | Yes - identical die | Yes - identical die | Yes - same MSOP-10 footprint | Yes - same MSOP-10 footprint |
Key Differentiators
- Pin-compatible upgrade with ADS1244 (vs ADS1244IDGSR)
- Wide analog supply range (vs ADS1252IDGSR)
- Simultaneous 50 Hz / 60 Hz rejection (vs ADS1246IDGSR)
- Same MSOP-10 footprint for layout reuse (vs LTC2402CMS#PBF)
Design Notes
Place 0.1 µF ceramic bypass capacitors as close as possible to the AVDD (pin 1) and DVDD (pin 9) pins, with the ground return via a short trace to AGND/DGND. The MSOP-10 thermal pad (where present on the DGS variant) should be soldered to a copper pour connected to AGND to minimise thermal-coupling offset errors and reduce digital ground bounce. Estimated: with 0.1 µF ceramic on each supply, decoupling is sufficient up to 1 MHz of digital switching transients, which exceeds the ADC's serial-clock envelope.
Route the analog inputs AINP/AINN over a continuous ground plane to maximise common-mode rejection; avoid routing these traces near the SCLK/DOUT digital lines. Estimated: keeping the analog trace length below 10 mm and the digital traces physically parallel to those analog traces at least 3 mm apart preserves the 20-bit effective resolution across production variation. Apply 100 Ω series resistors at the digital outputs if the traces must cross noisy regions.
Do not exceed the differential input common-mode range relative to AGND, otherwise the input multiplexer may violate headroom and the digital output saturates. The buffered input draws negligible current, but the internal ESD diodes can clamp during hot-plug events — add a 1 kΩ series resistor with a 10 nF capacitor on each analog input for transducer-cable hot-plug protection. Always tie DRDY/DOUT via a pull-up resistor (10 kΩ to DVDD) to ensure a defined logic high when the ADC is not selected.
The ADS1245 offers both a power-down mode and a low-speed data-rate mode to extend battery life. Estimated: in power-down, supply current drops to under 1 µA, so a handheld instrument can leave AVDD/DVDD connected to a coin-cell boost converter and only wake the ADC for a sample. After exiting power-down, allow at least one conversion cycle for the modulator to settle before reading DRDY/DOUT.
Compliance Information
RoHS compliant per Texas Instruments product page. AEC-Q100 not applicable — see ADS1245-Q1 variant for automotive projects. Halogen-free status not stated in provided data.
