My Inquiry
My Account
Texas Instruments ADS1285IRHBT
- Part No.:
- ADS1285IRHBT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ADS1285IRHBT.pdf
- Description:
- 32-BITHIGH-RESOLUTION TWO-CHANNE
- Quantity:
- Payment:
- Shipping:
Inventory:397
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADS1285IRHBT from Texas Instruments is a 32-bit delta-sigma analog-to-digital converter with integrated PGA, dual-channel multiplexer, and programmable digital filtering (sinc + FIR + IIR), delivering 134dB dynamic range at 2ms conversion time and 11.5mW power in high-power mode. It supports ±2.5V/3.3V/5V analog supplies, 125–4000 SPS data rates, and direct geophone/hydrophone interfacing for seismic acquisition systems.
For engineers reviewing the ADS1285IRHBT datasheet, ADS1285IRHBT pinout, ADS1285IRHBT application, or ADS1285IRHBT equivalent, this page provides verified specifications, functional pin roles, seismic-grade noise performance (THD < –120dB, CMRR 125dB), power-mode trade-offs, and validated alternative options for precision low-frequency measurement systems.
Technical Context
The ADS1285IRHBT integrates a high-resolution ΔΣ modulator with a flexible post-processing chain: selectable sinc filter followed by configurable FIR (linear or minimum phase) and optional IIR high-pass filtering to remove DC and sub-1Hz content. Its sample rate converter compensates clock frequency errors with 7.45ppb resolution, enabling stable timing in battery-powered field instruments.
It features a two-channel analog multiplexer, offset/gain calibration registers, SYNC input for synchronized multi-device acquisition, and programmable PGA gains from 1 to 64. The device operates across –40°C to +85°C and supports PGA bypass for unity-gain buffer operation, reducing power to 4.8mW at 129dB DR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 32-bit output word length; enables 134dB dynamic range for microvolt-level seismic signal capture. |
| Data Rate | 125–4000 SPS; supports both slow high-precision surveys (e.g., passive monitoring) and faster active-source profiling. |
| Dynamic Range | 134dB at 2ms (high-power), 129dB at 2ms (mid-power); directly determines smallest detectable signal above noise floor. |
| THD | < –120dB; ensures minimal harmonic distortion when digitizing low-amplitude, low-frequency earth signals. |
| CMRR | 125dB at 60Hz; rejects common-mode interference from power-line coupling in unshielded field deployments. |
| PGA Gain Range | 1 to 64 V/V; allows optimal signal scaling for diverse sensor outputs (geophones: ~100V/m/s, hydrophones: mV/Pa). |
| Reference Options | 2.5V / 4.096V / 5V; 4.096V reference enables exact 16-bit-aligned scaling for simplified firmware math. |
Pinout & Package
The ADS1285IRHBT is housed in a 32-pin, 5mm × 5mm VQFN package (RHB) with exposed thermal pad connected to AVSS. Pin functions are validated per TI SBAS559B Rev. November 2025.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1P / AIN1N AIN2P / AIN2N |
Differential analog inputs | Two independent channels for geophone/hydrophone pairs; supports differential sensor connection with >125dB CMRR. |
| CAPP / CAPN CAPBP / CAPBN CAPC / CAI / CAPR |
Internal capacitor connections | Required external C0G/NPO capacitors (10nF, 47nF, 4.7nF, 100nF) stabilize PGA, buffer, charge pump, and reference bias circuits. |
| AVDD1 / AVDD2 / AVSS / AGND | Analog power and ground | Separate supplies: AVDD1/AVSS for PGA, AVDD2 for modulator; AGND isolation minimizes digital noise coupling into analog path. |
| REFP / REFN | Reference voltage inputs | Accepts 2.5V/4.096V/5V references; REFP–REFN defines full-scale range; internal biasing requires CAPR–AVSS capacitor. |
| DIN / DOUT / SCLK / CS / DRDY / CLK / SYNC / RESET / PWDN | Digital interface & control | SPI-compatible serial interface with data-ready strobe; SYNC enables deterministic multi-ADC synchronization; PWDN enters µA-level sleep. |
| GPIO0 / GPIO1 | General-purpose I/O | Configurable as inputs or outputs; usable for status signaling, external trigger coordination, or sensor bias control. |
Key Features
| Feature | Design Value |
|---|---|
| Selectably optimized power modes | Three modes (high/mid/low) trade 134dB/11.5mW ↔ 129dB/4.8mW ↔ 125dB/3.4mW - enabling battery life extension without sacrificing required DR. |
| Programmable FIR + IIR filtering | FIR offers linear or minimum-phase response; IIR high-pass corner adjustable from 0.1Hz to 10Hz - removes drift and environmental low-freq noise. |
| On-chip offset and gain calibration | Registers allow one-time or periodic correction of system-level errors; eliminates need for external calibration hardware in field-deployed units. |
| Sample rate converter with clock error compensation | 7.45ppb resolution corrects crystal aging/tolerance; maintains accurate timing over temperature and years - critical for long-term seismic arrays. |
| Direct sensor interface capability | Low-noise PGA (5.5nV/√Hz @ G=16) and input protection enable direct geophone connection - removes external amplifier stage and associated noise/error sources. |
Applications
| Energy Exploration | Passive Seismic Monitoring |
|---|---|
|
Use Scenario: Active-source land/water surveys using geophone arrays to map subsurface hydrocarbon reservoirs. IC Role / Device Role / Timing Role: Primary ADC for each channel in distributed node recorders; provides synchronized, low-drift digitization at 1–4kSPS. Use Value: 134dB DR captures weak reflections amid strong surface noise; clock error compensation ensures phase coherence across 1000+ node networks. |
Use Scenario: Long-term deployment of autonomous stations detecting microseisms, volcanic tremors, or tectonic strain. IC Role / Device Role / Timing Role: Core digitizer in solar/battery-powered remote sensors; operates continuously in low-power mode (125–500 SPS). Use Value: 4.8mW mid-power mode extends battery life to >1 year; high CMRR rejects EMI from nearby infrastructure and weather systems. |
| Earth Sciences & Geology | Precision Instrumentation |
|
Use Scenario: Portable broadband seismometers used in crustal studies, earthquake aftershock analysis, and glacial monitoring. IC Role / Device Role / Timing Role: High-fidelity ADC in portable instruments requiring lab-grade accuracy in field conditions. Use Value: THD < –120dB preserves waveform fidelity for spectral analysis; PGA gain flexibility accommodates varied sensor sensitivities. |
Use Scenario: Calibration-grade data loggers and metrology equipment measuring ultra-low-frequency physical phenomena. IC Role / Device Role / Timing Role: Reference-class digitizer for traceable measurements where offset drift & gain stability are paramount. Use Value: Offset drift ≤0.5µV/°C (PGA) and gain drift ≤2ppm/°C ensure measurement repeatability across environmental chambers and field sites. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution, low-frequency ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1286IRHBT | 31-bit resolution, 128dB DR at 2ms, no IIR filter, lower max data rate (2000 SPS), identical RHB-32 package and pinout. | Lacks high-pass IIR stage; unsuitable for DC-coupled geophone arrays requiring sub-1Hz noise removal. | Choose when cost sensitivity outweighs need for IIR-based baseline suppression and highest DR. |
| AD7768-1ACPZ | 24-bit, 115dB DR, 128kSPS max, sigma-delta with sinc3 + FIR, SPI interface, 32-lead LFCSP, different pin assignment. | Higher speed but lower resolution; designed for vibration/industrial DAQ, not ultra-low-frequency seismic. | Choose for multi-axis vibration analysis or mixed-signal systems needing higher bandwidth, not for microseismic detection. |
Compared with ADS1285IRHBT, ADS1286IRHBT offers pin compatibility and lower cost but sacrifices 6dB DR and IIR filtering; AD7768-1ACPZ delivers higher throughput but cannot match the 134dB/0.1Hz noise floor required for passive seismic array nodes.
Availability
ADS1285IRHBT is available at Aetrix Electronics and suitable for energy exploration, passive seismic monitoring, and precision instrumentation requiring stable component supply, long-lifecycle support, and guaranteed traceability for field-deployed measurement systems.
Supply support for ADS1285IRHBT 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 industrial signal chains.
The ADS1285IRHBT belongs to TI's seismic-optimized delta-sigma ADC product line, engineered specifically for low-noise, low-power, high-stability digitization in geophysical sensing and earth science instrumentation.
FAQ
What is the maximum achievable dynamic range of the ADS1285IRHBT and under what conditions?
The ADS1285IRHBT achieves up to 134dB dynamic range at 2ms conversion time in high-power mode with 5V analog supplies and 4.096V reference. This specification is measured with PGA enabled at gain = 1, fDATA = 500 SPS, and proper external capacitor network (C0G/NPO types) installed per datasheet Section 4.1. The ADS1285IRHBT maintains 129dB DR in mid-power mode, trading 5dB for nearly 60% power reduction.
Does the ADS1285IRHBT support true differential input on both channels?
Yes, the ADS1285IRHBT supports fully differential inputs on both AIN1 (AIN1P/AIN1N) and AIN2 (AIN2P/AIN2N) channels. Each pair connects directly to the internal PGA with matched front-end paths, delivering 125dB CMRR at 60Hz. The device does not require external resistive networks for common-mode rejection - the differential architecture is intrinsic to its analog input stage design per TI SBAS559B Section 5.5.
Can the ADS1285IRHBT operate with a 3.3V analog supply, and what impact does that have on performance?
Yes, the ADS1285IRHBT supports AVDD1 = 3.3V (with AVSS = 0V) per Recommended Operating Conditions (Section 5.3). At 3.3V, high-power mode delivers 134dB DR and 11.5mW total power, matching the 5V spec. THD remains < –120dB, and noise density is unchanged. However, full-scale input range reduces proportionally: with 4.096V reference, max differential input becomes ±2.048V/Gain instead of ±2.5V/Gain at 5V.
How does the sample rate converter in the ADS1285IRHBT compensate for clock inaccuracy?
The ADS1285IRHBT's sample rate converter uses a fractional-N interpolator to adjust effective sampling rate based on real-time clock error measurement, achieving 7.45ppb resolution. It continuously monitors CLK period deviation against internal timing references and dynamically adjusts decimation ratios to maintain precise output data timing - critical for maintaining phase alignment across multi-node seismic arrays without external GPS disciplining.
What external components are mandatory for stable operation of the ADS1285IRHBT?
Mandatory external components include: 10nF C0G capacitors across CAPP–CAPN; 47nF C0G from CAPBP/CAPBN to AVSS; 4.7nF ≥10V ceramic capacitor from CAPC to AGND; 100nF ceramic from CAPI to AGND; 100nF ceramic from CAPR to AVSS; and 220nF ceramic from CAPD to DGND. All are specified in Table 4-1 and Figure 4-1 of the ADS1285IRHBT datasheet - omission causes instability, increased noise, or failure to meet AC specs.
ADS1285IRHBT 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:
- 32
- Sampling Rate (Per Second):
- 4k
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- 3-Wire Serial, SPI
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 3V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 32-VQFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1285IRHBT FAQ
1.How can I place an order for ADS1285IRHBT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1285IRHBT 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 ADS1285IRHBT reliable?
The price and inventory of ADS1285IRHBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1285IRHBT is usually 5 days.
3.What payment methods are accepted for ADS1285IRHBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1285IRHBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1285IRHBT?
ADS1285IRHBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1285IRHBT 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 ADS1285IRHBT?
For technical support, including ADS1285IRHBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1285IRHBT requirements.
6.How does Aetrix verify that ADS1285IRHBT is sourced from the original manufacturer or authorized distributors?
All ADS1285IRHBT 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 ADS1285IRHBT meets industry standards.
7.What is the process for return or replacement of ADS1285IRHBT?
All ADS1285IRHBT units undergo pre-shipment inspection (PSI). If there is an issue with ADS1285IRHBT, 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 ADS1285IRHBT part is unused and in its original packaging.
Return procedure for ADS1285IRHBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADS1285IRHBT Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
