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Analog Devices Inc. DC1010A-B
- Part No.:
- DC1010A-B
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC1010A-B.pdf
- Description:
- BOARD DELTA SIGMA ADC LTC2489
- Quantity:
- Payment:
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Product details
Overview
LTC2489 from Analog Devices (formerly Linear Technology) is a 16-bit, no-latency delta-sigma ADC with integrated I²C interface, Easy Drive input current cancellation, and 4-channel (2-differential/4-single-ended) multiplexed analog inputs. It delivers 2 ppm INL, 1 ppm offset error, 600 nVRMS noise, simultaneous 50 Hz/60 Hz rejection, and operates from 2.7 V to 5.5 V. It is used in precision sensor digitization for industrial process control and temperature-compensated data acquisition systems.
For engineers reviewing the LTC2489 datasheet, LTC2489 pinout, LTC2489 application, or LTC2489 equivalent, key selection considerations include rail-to-rail input support with zero differential input current, internal oscillator operation at 307.2 kHz, 24-bit output format (16-bit + sign), GND-to-VCC common-mode input range independent of reference voltage, and automatic per-conversion offset/full-scale calibration.
Technical Context
The LTC2489 implements a third-order delta-sigma modulator with decimating FIR filter and patented Easy Drive sampling architecture that cancels differential input current in real time-enabling direct digitization of high-impedance sensors without external buffers. Its auto-calibration engine performs full offset and full-scale correction every conversion cycle, ensuring stability across temperature, supply voltage, and channel switching.
It uses a 2-wire I²C interface with nine selectable slave addresses via CA0/CA1 pins and one global address for synchronization. The device supports both internal (307.2 kHz) and external oscillator modes, enabling configurable conversion times (144.1 ms typical) and programmable 50/60 Hz rejection nulls. Input common-mode range spans GND to VCC, while reference common-mode range is also GND to VCC, with minimum VREF = 0.1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonic transfer function and unambiguous digital representation across full input range. |
| INL | 2 ppm of VREF - ensures linearity error ≤ ±0.0002% of full scale, critical for high-accuracy measurement systems. |
| Offset Error | ±0.5 µV (typical) - enables sub-microvolt DC accuracy without external trimming or system-level calibration. |
| Noise (RMS) | 600 nV - corresponds to 0.02 LSB transition noise at 5 V reference, supporting 16-bit effective resolution in low-frequency applications. |
| Supply Range | 2.7 V to 5.5 V - allows direct integration into 3.3 V and 5 V industrial and instrumentation power domains. |
| Power (Active) | 160 µA (typical) - enables ultra-low-power operation suitable for battery-backed or energy-constrained sensor nodes. |
| 50/60 Hz Rejection | Simultaneous 87 dB - eliminates mains interference without external notch filters or software post-processing. |
Pinout & Package
Package: 14-lead (4 mm × 3 mm) plastic DFN with exposed pad (Pin 15 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF– (Pin 14) | Differential reference negative input | Sets lower bound of reference voltage; must be ≤ REF+ – 0.1 V; common-mode range: GND to VCC – 0.1 V. |
| REF+ (Pin 13) | Differential reference positive input | Sets upper bound of reference voltage; common-mode range: 0.1 V to VCC; defines full-scale range as VREF = REF+ – REF–. |
| VCC (Pin 12) | Positive supply input | 2.7 V to 5.5 V operation; requires local 10 µF tantalum + 0.1 µF ceramic bypass to GND. |
| CH0–CH3 (Pins 8–11) | Analog input channels | Configurable as single-ended or differential pairs; absolute input range: GND – 0.3 V to VCC + 0.3 V. |
| COM (Pin 7) | Common negative input for single-ended mode | Serves as shared IN– for CH0–CH3 in single-ended configuration; same voltage range as CHx pins. |
| GND (Pin 6) | Analog/digital ground reference | Low-impedance connection required; electrically tied to exposed pad (Pin 15). |
| SDA (Pin 5) | I²C bidirectional data line | Open-drain output during read; high-impedance input during write; requires external pull-up to VCC. |
| SCL (Pin 4) | I²C clock input | Slave-only interface; accepts up to 400 kHz clock; data latched on rising edge, updated on falling edge. |
| CA0, CA1 (Pins 2–3) | I²C address select inputs | Three-state (LOW/HIGH/FLOAT) configuration yields 9 unique slave addresses plus one global sync address. |
| fO (Pin 1) | Internal/external oscillator control | GND = internal 307.2 kHz oscillator; driven externally for custom data rate and filter null placement. |
Key Features
| Feature | Design Value |
|---|---|
| No latency conversion | Digital filter settles in one cycle - first result after channel change is fully valid and meets all specs, eliminating wait states in multiplexed systems. |
| Easy Drive input current cancellation | Zero differential input current - enables direct connection of high-impedance sources (e.g., RTDs, thermocouples, bridge sensors) without buffer amplifiers or matching networks. |
| Auto-calibration per conversion | Continuous offset and full-scale correction - removes drift due to temperature, supply variation, and aging; no user intervention required. |
| Rail-to-rail input common-mode range | GND to VCC, independent of VREF - supports direct digitization of signals beyond traditional op-amp rails, including grounded or floating sensors. |
| Simultaneous 50 Hz/60 Hz rejection | 87 dB attenuation - inherent in digital filter design; no external components or firmware compensation needed for worldwide AC line immunity. |
Applications
| Industrial Process Monitoring | Direct Temperature Measurement |
|---|---|
|
Use Scenario: Continuous monitoring of pressure, flow, and level transmitters in PLC-based control cabinets with 4–20 mA loop-powered sensors. IC Role / Device Role / Timing Role: Precision analog front-end ADC digitizing conditioned sensor outputs with minimal external circuitry. Use Value: Eliminates need for external instrumentation amplifiers and anti-aliasing filters, reducing BOM count and board area while maintaining 16-bit accuracy over –40°C to +85°C. |
Use Scenario: High-resolution cold-junction compensation and thermocouple voltage digitization in portable handheld test equipment. IC Role / Device Role / Timing Role: Direct sensor digitizer with integrated reference and auto-calibration for thermoelectric voltage measurement. Use Value: Achieves <1 µV offset drift over temperature, enabling ±0.1°C temperature resolution without factory calibration or lookup tables. |
| Data Acquisition System with Temp Compensation | Instrumentation Grade Sensor Interface |
|
Use Scenario: Modular DAQ modules for lab-grade environmental monitoring, measuring humidity, gas concentration, and strain gauge bridges. IC Role / Device Role / Timing Role: Multi-channel delta-sigma converter with synchronized sampling and I²C output for microcontroller host. Use Value: Simultaneous 50/60 Hz rejection and 600 nV RMS noise allow clean measurements in electrically noisy environments without shielding or synchronous sampling. |
Use Scenario: Front-end for medical-grade patient monitoring devices requiring stable, low-drift analog signal conditioning. IC Role / Device Role / Timing Role: Low-power, high-accuracy ADC interfacing directly to biopotential electrodes and isolation amplifiers. Use Value: 1 ppm offset error and 2 ppm INL meet Class I medical device accuracy requirements; 1 µA sleep current extends battery life in portable units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS114S08B (Texas Instruments) | 24-bit resolution, SPI interface only, no built-in I²C; requires external reference; higher power (350 µA active). | Preferred where higher resolution is needed and SPI bus is available; lacks Easy Drive architecture - requires external buffers for high-Z sensors. | Select when 24-bit resolution outweighs I²C convenience and power budget allows >2× higher current draw. |
| MAX11200 (Maxim Integrated) | 24-bit, I²C-compatible, but no integrated oscillator; requires external clock; no simultaneous 50/60 Hz rejection; larger 20-pin TSSOP package. | Suitable for space-tolerant designs needing ultra-low noise; lacks rail-to-rail input common-mode range - limited to 0.1 V to VCC – 0.1 V. | Choose when maximum ENOB (>21 bits) is prioritized over footprint, power, and ease of use with high-impedance sources. |
Compared with ADS114S08B and MAX11200, the LTC2489 uniquely combines I²C simplicity, zero-differential-input-current front-end, simultaneous line-frequency rejection, and 16-bit accuracy in a 4 mm × 3 mm DFN - making it optimal for compact, low-power, high-accuracy sensor digitization where minimal external components are required.
Availability
LTC2489 is available at Aetrix Electronics and suitable for industrial process control, precision temperature measurement, data acquisition systems with temperature compensation, and instrumentation-grade sensor interfaces requiring stable component supply across extended temperature ranges.
Supply support for LTC2489 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
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2489 belongs to ADI's precision delta-sigma ADC product line, designed specifically for direct sensor digitization in resource-constrained, high-accuracy applications where low power, small size, and minimal external components are essential.
FAQ
What is the input voltage range supported by the LTC2489?
The LTC2489 supports a differential input range of –0.5 × VREF to +0.5 × VREF in both single-ended and differential configurations. Its analog input pins (CH0–CH3, COM) accept absolute voltages from GND – 0.3 V to VCC + 0.3 V, enabling true rail-to-rail operation independent of the reference voltage. This allows direct digitization of grounded or floating sensors without level-shifting circuitry - a capability confirmed in the LTC2489 datasheet Section "Analog Input and Reference".
Does the LTC2489 require an external reference voltage?
No - the LTC2489 accepts an external differential reference (REF+ and REF–), but it does not require one: REF+ may be tied to VCC and REF– to GND for simplest operation. The reference voltage range is 0.1 V to VCC, and the device maintains full 16-bit accuracy across this range. Internal calibration compensates for reference drift, and noise performance improves proportionally as VREF decreases - all verified in Electrical Characteristics Table and Applications Information sections of the LTC2489 datasheet.
How does the Easy Drive technology work in the LTC2489?
Easy Drive uses a proprietary passive sampling network to cancel differential input current in real time, eliminating dynamic errors caused by source impedance mismatch. This allows high-impedance sensors (e.g., RTDs, thermocouples) to connect directly without external buffers. Common-mode current is minimized by balancing impedances or setting common-mode voltage equal to reference common-mode voltage. The architecture avoids on-chip buffering, preserving rail-to-rail input swing - details are documented in the "Easy Drive Input Current Cancellation" section of the LTC2489 datasheet.
Can the LTC2489 perform conversions while in sleep mode?
No - the LTC2489 enters a low-power sleep state (1 µA typical) after each conversion completes and holds the result in a static shift register until addressed. Conversion only occurs in the active state: triggered by a stop condition after a write, an incomplete read, or automatically after a complete 3-byte read. Sleep mode reduces power by two orders of magnitude and is explicitly defined in the "Converter Operation Cycle" section of the LTC2489 datasheet.
What is the significance of the fO pin on the LTC2489?
The fO pin controls the conversion clock source: grounding fO selects the internal 307.2 kHz oscillator, while driving fO with an external signal overrides it to set custom data rates and adjust digital filter rejection nulls (e.g., for non-standard line frequencies). External oscillator frequency range is 10 kHz to 1000 kHz, and conversion time scales inversely with fEOSC. This flexibility is specified in Absolute Maximum Ratings and Converter Characteristics tables of the LTC2489 datasheet.
DC1010A-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Easy Drive™
- Packaging:
- Box
- Product Status:
- Active
- Number of A/D Converters:
- 1
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 7.5
- Data Interface:
- I2C, Serial
- Input Range:
- -
- Power (Typ) @ Conditions:
- -
- Utilized IC / Part:
- LTC2489
- Contents:
- Board(s)
DC1010A-B FAQ
1.How can I place an order for DC1010A-B through Aetrix?
Please submit a Request for Quotation (RFQ) for DC1010A-B 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 DC1010A-B reliable?
The price and inventory of DC1010A-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC1010A-B is usually 5 days.
3.What payment methods are accepted for DC1010A-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC1010A-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC1010A-B?
DC1010A-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC1010A-B 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 DC1010A-B?
For technical support, including DC1010A-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC1010A-B requirements.
6.How does Aetrix verify that DC1010A-B is sourced from the original manufacturer or authorized distributors?
All DC1010A-B 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 DC1010A-B meets industry standards.
7.What is the process for return or replacement of DC1010A-B?
All DC1010A-B units undergo pre-shipment inspection (PSI). If there is an issue with DC1010A-B, 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 DC1010A-B part is unused and in its original packaging.
Return procedure for DC1010A-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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