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Analog Devices Inc. DC1012A-B
- Part No.:
- DC1012A-B
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC1012A-B.pdf
- Description:
- BOARD DELTA SIGMA ADC LTC2497
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2497 from Analog Devices (formerly Linear Technology) is a 16-channel (8-differential), 16-bit delta-sigma ADC with Easy Drive input current cancellation, I²C interface, and integrated oscillator. It delivers 2 ppm INL, 1 ppm offset error, 600 nV RMS noise, and simultaneous 50 Hz/60 Hz rejection - enabling direct digitization of high-impedance sensors in industrial process control systems.
For engineers reviewing the LTC2497 datasheet, LTC2497 pinout, LTC2497 application, or LTC2497 equivalent, key selection considerations include rail-to-rail common-mode input range (GND to VCC), zero differential input current, no-latency single-cycle digital filter settling, and support for external or internal clocking at 307.2 kHz.
Technical Context
The LTC2497 employs a third-order delta-sigma modulator with decimating FIR filtering and automatic per-conversion offset/full-scale calibration. Its patented Easy Drive sampling network cancels differential input current without on-chip buffers, allowing direct connection of sensors with source impedances up to 100 kΩ while preserving DC accuracy.
It operates in single-supply mode (2.7 V to 5.5 V), supports 27 I²C addresses plus global sync, and features multiplexer outputs (MUXOUTP/N) and ADC inputs (ADCINP/N) that enable optional shared external amplifiers - with auto-calibration removing their offset and drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage across full input range. |
| INL | 2 ppm of VREF - enables high-precision measurement in instrumentation-grade applications. |
| Offset Error | 1 µV typical - ensures accurate zero-point measurement without manual calibration. |
| Noise (RMS) | 600 nV - corresponds to 0.02 LSB transition noise at 5 V reference, supporting sub-microvolt resolution. |
| Input Common-Mode Range | GND to VCC - allows rail-to-rail sensor signals independent of reference voltage level. |
| Power Supply | 2.7 V to 5.5 V - supports battery-powered and industrial 3.3 V/5 V systems with 160 µA conversion current. |
| 50/60 Hz Rejection | Simultaneous 87 dB - eliminates line-frequency interference without external notch filters. |
| I²C Address Options | 27 unique addresses + 1 global sync - enables multi-device networks on shared bus without address conflict. |
Pinout & Package
38-lead (5 mm × 7 mm) plastic QFN package with exposed pad (Pin 39 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 6, 31–34, Exposed Pad 39) | Ground reference and power return | Seven dedicated ground pins + exposed pad ensure low-impedance return path and optimal decoupling for precision analog operation. |
| SCL (Pin 2) | I²C serial clock input | Slave-only interface; accepts external clock up to 400 kHz - timing-critical for data synchronization and read/write cycles. |
| SDA (Pin 3) | Bidirectional I²C data line | Open-drain output requiring external pull-up; carries channel select commands and 24-bit conversion results. |
| COM (Pin 7) | Common negative input for single-ended mode | Enables 16 single-ended channels when paired with CH0–CH15 as IN+; supports rail-to-rail common-mode voltage (GND – 0.3 V to VCC + 0.3 V). |
| CH0–CH15 (Pins 8–23) | Analog input channels | Configurable as 8 differential pairs or 16 single-ended inputs; all accept input voltages beyond supply rails within ±0.3 V limits. |
| MUXOUTP/N (Pins 24, 27) | Multiplexer output terminals | Provide buffered analog signal pre-ADC; allow sharing of external amplifiers across all channels with auto-calibrated drift compensation. |
| ADCINP/N (Pins 25, 26) | Delta-sigma ADC analog inputs | Direct connection point for MUXOUT or external amplifier output; designed for minimal parasitic capacitance to preserve noise and linearity. |
| REF+/REF– (Pins 29, 30) | Differential reference inputs | Accept 0.1 V to VCC differential reference; common-mode range spans full supply - enables flexible reference sourcing (e.g., VCC/GND or precision bandgap). |
| fO (Pin 35) | Frequency control input | Logic-level pin selecting internal oscillator (307.2 kHz) or external clock - determines conversion rate and digital filter null placement. |
| CA0–CA2 (Pins 36–38) | I²C address configuration | Three-state (LOW/HIGH/FLOAT) inputs setting 3-bit chip address - supports 27 unique device addresses on same I²C bus. |
Key Features
| Feature | Design Value |
|---|---|
| No Latency Delta-Sigma Architecture | Digital filter settles in one cycle after channel change - first conversion is valid and fully specified, eliminating acquisition delay in multiplexed systems. |
| Easy Drive Input Current Cancellation | Zero differential input current - enables direct interface to thermocouples, RTDs, and bridge sensors without buffer amplifiers or matched RC networks. |
| Auto-Calibration per Conversion | Continuous offset and full-scale correction - removes drift from temperature, supply variation, and channel switching without user intervention. |
| Rail-to-Rail Input Common-Mode Range | GND to VCC independent of reference voltage - simplifies sensor interfacing in mixed-supply systems and eliminates level-shifting circuitry. |
| Integrated Oscillator with External Clock Option | Factory-trimmed 307.2 kHz internal clock - provides guaranteed 50/60 Hz rejection; fO pin allows external clock for custom data rates or enhanced EMI immunity. |
| Low Power Sleep Mode | 1 µA typical sleep current - reduces system power by two orders of magnitude between conversions, ideal for battery-operated data loggers. |
Applications
| Industrial Process Control | Direct Sensor Digitization |
|---|---|
Use Scenario: Monitoring temperature, pressure, and flow using 4–20 mA transmitters, RTDs, and strain gauges in PLC analog input modules. IC Role / Device Role / Timing Role: Precision 16-bit ADC front-end with integrated Easy Drive and auto-calibration, digitizing multiple sensor channels over extended temperature range (–40°C to 85°C). Use Value: Eliminates external op-amps and discrete calibration components while maintaining 2 ppm INL and simultaneous 50/60 Hz rejection for factory-floor noise immunity. |
Use Scenario: Direct digitization of thermocouples and load cells in portable test equipment and environmental monitoring nodes. IC Role / Device Role / Timing Role: High-impedance sensor interface ADC with zero differential input current and rail-to-rail common-mode range, operating from single 3.3 V supply. Use Value: Enables <1 µV offset stability and 600 nV RMS noise without external buffering - reducing BOM count and PCB area in space-constrained designs. |
| Instrumentation | Temperature Measurement Systems |
Use Scenario: High-accuracy benchtop multimeters and data acquisition systems requiring stable DC accuracy and low noise. IC Role / Device Role / Timing Role: Core 16-bit delta-sigma converter with 24-bit output format, 1 ppm offset, and 2 ppm INL - used in main measurement path with programmable gain stage. Use Value: Delivers laboratory-grade linearity and repeatability without oven-controlled references or manual recalibration cycles. |
Use Scenario: Multi-point temperature sensing in HVAC controllers and industrial ovens using thermistors and RTDs. IC Role / Device Role / Timing Role: 16-channel analog front-end with COM pin supporting single-ended configurations and built-in 50/60 Hz rejection for AC mains environments. Use Value: Supports up to 16 sensors per device with per-channel auto-calibration - reducing system cost and complexity versus discrete ADC-per-sensor architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08 (Texas Instruments) | 24-bit resolution, SPI interface, integrated PGA; no I²C or Easy Drive; higher power (310 µA typ) | Better resolution for ultra-low-level signals but requires external anti-aliasing and lacks simultaneous 50/60 Hz rejection | Select for higher resolution where SPI is preferred and external filtering is acceptable |
| MAX11206 (Maxim Integrated) | 24-bit, I²C interface, 12-channel, no integrated oscillator; requires external clock for 50/60 Hz rejection | Smaller channel count and no Easy Drive - needs external buffers for high-Z sensors | Select when 24-bit resolution is mandatory and system already includes precision clock source |
Compared with ADS124S08 and MAX11206, the LTC2497 uniquely combines I²C simplicity, zero-differential-input-current operation, and guaranteed simultaneous 50/60 Hz rejection in a single 16-bit solution - making it optimal for cost-sensitive, noise-prone industrial sensor nodes requiring minimal external components.
Availability
LTC2497 is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, temperature measurement systems, and sensor data loggers requiring stable component supply across extended temperature ranges (–40°C to 85°C).
Supply support for LTC2497 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies.
The LTC2497 belongs to Linear's precision delta-sigma ADC product line, designed specifically for high-accuracy, low-power, multichannel sensor digitization in harsh industrial and instrumentation environments.
FAQ
What is the maximum source impedance the LTC2497 can drive without accuracy loss?
The LTC2497 uses Easy Drive technology to cancel differential input current, enabling accurate digitization with source impedances up to 100 kΩ. As shown in Figure TA01b, full-scale error remains within ±20 ppm even at 100 kΩ, provided common-mode input is balanced or tied to reference common-mode voltage. This eliminates need for external buffers in most RTD, thermocouple, and bridge applications.
Does the LTC2497 require external components for 50 Hz and 60 Hz rejection?
No - the LTC2497 achieves simultaneous 50 Hz and 60 Hz rejection (87 dB typical) inherently through its digital filter architecture when using the internal 307.2 kHz oscillator. No external notch filters, capacitors, or clock sources are needed. This rejection is guaranteed across temperature and supply voltage variations per Electrical Characteristics table.
How does the LTC2497 handle channel switching and conversion validity?
The LTC2497 has no latency: the first conversion after selecting a new channel is fully valid and meets all specifications (INL, offset, noise). This is enabled by its single-cycle digital filter settling and per-conversion auto-calibration. Unlike conventional delta-sigma ADCs, there is no "settling delay" or discarded samples - simplifying firmware and maximizing effective throughput in multiplexed systems.
Can the LTC2497 operate with a 2.7 V supply and still maintain full 16-bit performance?
Yes - the LTC2497 is fully specified from 2.7 V to 5.5 V. At 2.7 V, it maintains 2 ppm INL, 15 ppm total unadjusted error, and 600 nV RMS noise (per Electrical Characteristics tables). The internal oscillator frequency shifts slightly (<±0.5%) but retains 50/60 Hz rejection capability. Sleep current remains at 1 µA, supporting ultra-low-power battery operation.
What is the function of the MUXOUTP/MUXOUTN and ADCINP/ADCINN pins?
MUXOUTP/N provide buffered analog outputs from the internal multiplexer; ADCINP/N are the differential inputs to the delta-sigma modulator. They may be shorted directly for direct digitization, or connected to an external amplifier - which the LTC2497 automatically calibrates for offset and drift every conversion cycle. This enables high-precision signal conditioning with minimal external components.
DC1012A-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:
- LTC2497
- Contents:
- Board(s)
DC1012A-B FAQ
1.How can I place an order for DC1012A-B through Aetrix?
Please submit a Request for Quotation (RFQ) for DC1012A-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 DC1012A-B reliable?
The price and inventory of DC1012A-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC1012A-B is usually 5 days.
3.What payment methods are accepted for DC1012A-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC1012A-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC1012A-B?
DC1012A-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC1012A-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 DC1012A-B?
For technical support, including DC1012A-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC1012A-B requirements.
6.How does Aetrix verify that DC1012A-B is sourced from the original manufacturer or authorized distributors?
All DC1012A-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 DC1012A-B meets industry standards.
7.What is the process for return or replacement of DC1012A-B?
All DC1012A-B units undergo pre-shipment inspection (PSI). If there is an issue with DC1012A-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 DC1012A-B part is unused and in its original packaging.
Return procedure for DC1012A-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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