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Texas Instruments ADS1245IDGSRG4
- Part No.:
- ADS1245IDGSRG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS1245IDGSRG4.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,845
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Product details
Overview
ADS1245IDGSRG4 from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter (ADC) with 20-bit effective resolution, ±2.5V differential input range, and high-impedance buffered input (3 GΩ). It operates from 2.5V–5.25V analog and 1.8V–3.6V digital supplies, consumes 158 µA at 5V AVDD, and delivers 15 SPS with single-cycle settling-ideal for portable medical sensors and handheld instrumentation requiring precision under power constraints.
For engineers reviewing the ADS1245IDGSRG4 datasheet, ADS1245IDGSRG4 pinout, ADS1245IDGSRG4 application, or ADS1245IDGSRG4 equivalent, key selection criteria include its 3 GΩ buffered input impedance, simultaneous 50/60 Hz rejection, self-calibration capability, Sleep mode (<1 µW), and MSOP-10 package compatibility with ADS1244-based designs.
Technical Context
The ADS1245IDGSRG4 employs a third-order delta-sigma modulator with a ±2.5V differential input range referenced to VREFP/VREFN, and a digital filter that achieves full settling in one conversion cycle while rejecting 50 Hz and 60 Hz interference. Its buffered analog front-end isolates high-impedance sources without external amplification.
Control is implemented via a two-wire serial interface: DRDY/DOUT signals data readiness and shifts out 24-bit two's complement data on SCLK rising edges, while CLK (typically 2.4576 MHz) governs data rate and filter notch placement. Sleep mode activation requires holding SCLK high after DRDY/DOUT assertion, reducing current to <1 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit output with 20-bit effective resolution-guarantees no missing codes and supports high-precision DC measurements. |
| Data Rate | 15 samples per second (SPS) at 2.4576 MHz CLK-optimized for low-noise, power-line-rejected industrial sensing. |
| Differential Input Range | ±2.5 V (with 1.25 V reference)-enables direct interfacing with common sensor bridges and transducers. |
| Input Impedance | 3 GΩ buffered input-eliminates loading errors from high-Z sources like thermocouples or pH electrodes. |
| INL Error | ±0.0015% FSR max-ensures accuracy across full scale without system-level trimming. |
| Power Consumption | 470 µW typical (AVDD=3V, DVDD=3V); <1 µW in Sleep mode-extends battery life in portable medical devices. |
| Supply Ranges | Analog: 2.5–5.25 V; Digital: 1.8–3.6 V-supports flexible dual-supply or single-supply (via resistor drop) configurations. |
Pinout & Package
ADS1245IDGSRG4 is housed in an MSOP-10 (DGS) package, 3.0 mm × 3.0 mm × 1.0 mm, with exposed thermal pad (not electrically connected). Pin assignments are validated per TI SBAS287A datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Analog and digital ground reference | Single-point connection required for noise-sensitive ADC performance; separates analog/digital return paths internally. |
| VREFP (Pin 2) | Positive voltage reference input | Defines upper reference rail; must be ≥ GND + 0.1 V and ≤ AVDD + 0.1 V for valid operation. |
| VREFN (Pin 3) | Negative voltage reference input | Defines lower reference rail; differential VREF = VREFP − VREFN sets full-scale range (±2×VREF). |
| AINN (Pin 4) | Negative analog input | Differential input terminal; absolute voltage must stay within GND + 0.1 V to AVDD − 1.25 V. |
| AINP (Pin 5) | Positive analog input | Differential input terminal; high-impedance buffered node enables direct sensor connection. |
| AVDD (Pin 6) | Analog power supply | Supplies modulator and buffer; accepts 2.5–5.25 V; bypass with 0.1 µF capacitor near pin. |
| DVDD (Pin 7) | Digital power supply | Supplies digital logic and interface; accepts 1.8–3.6 V; tolerant of 5 V logic on CLK/SCLK inputs. |
| DRDY/DOUT (Pin 8) | Open-drain status/data output | Asserts low when conversion complete; then outputs 24-bit MSB-first data on SCLK rising edges. |
| SCLK (Pin 9) | Serial clock input | Controls data readout timing and initiates Sleep mode (hold high) or self-calibration (26th edge). |
| CLK (Pin 10) | System clock input | Drives modulator and filter; 2.4576 MHz recommended for 15 SPS and 50/60 Hz rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 50 Hz and 60 Hz rejection | Digital filter notches placed at both line frequencies by default CLK frequency-no external notch filters needed. |
| Single-cycle settling | Valid output data available after one conversion-enables true on-demand sampling without settling delay overhead. |
| Self-calibration | On-chip offset/gain calibration initiated via SCLK waveform-eliminates need for external calibration circuitry. |
| High-impedance buffered input | 3 GΩ input impedance at 2.4576 MHz-preserves signal integrity from microamp-level sensor sources. |
| Low-power Sleep mode | <1 µW power draw with CLK stopped-reduces average system power in intermittent measurement applications. |
Applications
| Hand-Held Instrumentation | Portable Medical Equipment |
|---|---|
|
Use Scenario: Battery-powered multimeters and environmental sensors performing periodic DC voltage/current measurements. IC Role / Device Role / Timing Role: Primary high-resolution ADC capturing slow-varying sensor outputs with minimal power budget. Use Value: 20-bit effective resolution and 3 GΩ input enable direct connection to high-Z probes without signal degradation. |
Use Scenario: Wearable ECG or glucose monitors requiring ultra-low-power, high-accuracy analog acquisition. IC Role / Device Role / Timing Role: Signal digitization front-end with Sleep mode activated between heartbeat intervals. Use Value: <1 µW Sleep current extends device runtime; 50/60 Hz rejection ensures clean biosignal capture in noisy environments. |
| Industrial Process Control | Test and Measurement Systems |
|
Use Scenario: Remote temperature/pressure transmitters in factory automation using 4–20 mA loops or wireless nodes. IC Role / Device Role / Timing Role: Precision sensor interface with self-calibration to maintain accuracy over temperature drift. Use Value: ±0.0015% INL max and 0.01 ppm/°C offset drift reduce recalibration frequency in unattended deployments. |
Use Scenario: Benchtop data loggers acquiring thermocouple, RTD, or strain gauge signals with high channel density. IC Role / Device Role / Timing Role: Synchronized multi-channel ADC subsystem using shared CLK and SCLK for coherent sampling. Use Value: Pin-compatible upgrade path from ADS1244 allows reuse of existing PCB layouts while improving input impedance and noise performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution, low-power ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1244IDGST | Same MSOP-10 package and pinout; 19-bit effective resolution; 2.2 GΩ input impedance; no Sleep mode. | Lacks Sleep mode and 3 GΩ buffering-unsuitable for battery-critical or ultra-high-Z sensor use cases. | Select ADS1245IDGSRG4 when buffered input, Sleep mode, or >19-bit ENOB is required. |
| ADS1256IPWR | 24-bit, 30 kSPS; SPI interface; 28-pin TSSOP; higher power (1 mW); no integrated buffer. | Higher speed and resolution but requires external op-amp buffering and consumes >6× more power. | Choose ADS1245IDGSRG4 for space-constrained, low-power, high-Z applications where 15 SPS suffices. |
Compared with ADS1244IDGST, ADS1245IDGSRG4 adds Sleep mode and higher input impedance without layout change; compared with ADS1256IPWR, it trades speed and package size for dramatically lower power and integrated buffering-making it optimal for portable, sensor-front-end roles.
Availability
ADS1245IDGSRG4 is available at Aetrix Electronics and suitable for hand-held instrumentation, portable medical equipment, and industrial process control requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADS1245IDGSRG4 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 low-power design.
The ADS1245IDGSRG4 belongs to TI's precision delta-sigma ADC product line, engineered specifically for high-resolution, low-power, high-impedance sensor interfacing in portable and space-constrained systems.
FAQ
What is the effective resolution and maximum data rate of the ADS1245IDGSRG4?
The ADS1245IDGSRG4 delivers 20-bit effective resolution with no missing codes and a maximum data rate of 15 samples per second (SPS) when operating at the recommended 2.4576 MHz system clock. This combination provides optimal noise performance and simultaneous 50 Hz/60 Hz rejection for precision DC measurements in demanding environments.
How does the buffered input of the ADS1245IDGSRG4 benefit high-impedance sensor interfaces?
The ADS1245IDGSRG4 features a chopper-stabilized buffer delivering 3 GΩ input impedance at 2.4576 MHz, minimizing loading errors from high-Z sources such as thermocouples, pH electrodes, or piezoresistive sensors. This eliminates the need for external op-amps and preserves signal fidelity without additional power or board space.
Can the ADS1245IDGSRG4 operate from a single supply, and what are the voltage constraints?
Yes, the ADS1245IDGSRG4 supports single-supply operation: AVDD and DVDD may be tied together if the shared rail falls within both ranges (2.5–3.6 V is the overlapping window). For higher voltages (e.g., 5 V), DVDD must be regulated separately to 1.8–3.6 V using a series resistor or LDO, while CLK and SCLK remain 5 V-tolerant.
What is the function of the DRDY/DOUT pin on the ADS1245IDGSRG4, and how is it used during data retrieval?
The DRDY/DOUT pin on the ADS1245IDGSRG4 serves dual functions: it asserts low to signal valid conversion data (DRDY), then transitions to serial data output (DOUT), shifting 24-bit two's complement data MSB-first on each SCLK rising edge. A 25th SCLK forces the pin high to avoid bus contention during polling.
Does the ADS1245IDGSRG4 support synchronized multi-channel sampling, and how is it implemented?
Yes, the ADS1245IDGSRG4 supports synchronized multi-channel sampling. Multiple units share the same CLK and SCLK signals; all are placed in Sleep mode, then awakened simultaneously. Their DRDY/DOUT outputs go low within t14 timing skew (per datasheet), enabling coherent sampling across channels without external timing controllers.
ADS1245IDGSRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 15
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.5V ~ 5.25V
- Voltage - Supply, Digital:
- 1.8V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-VSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1245IDGSRG4 FAQ
1.How can I place an order for ADS1245IDGSRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1245IDGSRG4 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 ADS1245IDGSRG4 reliable?
The price and inventory of ADS1245IDGSRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1245IDGSRG4 is usually 5 days.
3.What payment methods are accepted for ADS1245IDGSRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1245IDGSRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1245IDGSRG4?
ADS1245IDGSRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1245IDGSRG4 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 ADS1245IDGSRG4?
For technical support, including ADS1245IDGSRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1245IDGSRG4 requirements.
6.How does Aetrix verify that ADS1245IDGSRG4 is sourced from the original manufacturer or authorized distributors?
All ADS1245IDGSRG4 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 ADS1245IDGSRG4 meets industry standards.
7.What is the process for return or replacement of ADS1245IDGSRG4?
All ADS1245IDGSRG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS1245IDGSRG4, 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 ADS1245IDGSRG4 part is unused and in its original packaging.
Return procedure for ADS1245IDGSRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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