LTC2461CDD - 16-Bit I2C Delta-Sigma ADC | Analog Devices
Référence : LTC2461CDD ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $6.3 | $6,30 |
| 10 | $5.85 | $58,50 |
| 100 | $5.1 | $510,00 |
| 500 | $4.4 | $2 200,00 |
| 1 000 | $3.75 | $3 750,00 |
LTC2461CDD Présentation
What is a delta-sigma ADC? A delta-sigma (ΔΣ) analog-to-digital converter oversamples an input signal at a rate much higher than Nyquist and uses noise-shaping digital filtering to push quantization noise out of the signal band, achieving high resolution (16 bits and beyond) at the cost of conversion speed. Delta-sigma ADCs sit in the broader category of analog-to-digital converters > data converters > signal chain ICs > semiconductors, and are the standard choice for low-frequency, high-precision measurements.
Key features of the LTC2461 include an integrated 1.25V reference with 10 ppm/°C drift, 16-bit no-missing-codes performance, single-cycle conversion, automatic sleep between conversions to minimize quiescent current, and a simple I2C interface with pin-selectable addresses. The internal oscillator eliminates the need for an external clock, and the small DFN-12 (3x3 mm) footprint makes it ideal for space-constrained sensor modules and battery-powered instruments where PCB area is at a premium.
Technically, the LTC2461 uses a proprietary multi-order delta-sigma modulator followed by a digital SINC1 filter, providing single-cycle settling at the output data rate. The internal reference is factory-trimmed and temperature-compensated, removing the need for an external precision reference. The I2C interface supports standard (100 kHz) and fast (400 kHz) modes and includes a chip-enable pin that allows up to two devices on the same bus, simplifying multi-channel sensor designs.
Typical applications include portable instrumentation, weight scales and force sensors, temperature and pressure monitoring, industrial process control front-ends, and battery-powered sensor nodes. The ultra-low power and tiny footprint make it especially attractive for IoT edge devices and wearable health monitors where every square millimeter and microamp matters.
When designing with the LTC2461, observe the I2C pull-up resistor sizing rules and decouple VDD with a 0.1 µF ceramic capacitor placed as close as possible to the VDD pin. The input signal should be kept within 0V to VREF (1.25V); for higher voltage inputs, an external resistive divider or buffer is required. Use the chip-enable pin to share the I2C bus with another LTC2461 or LTC2463 device for dual-channel systems.
This page synthesizes distributor stock and pricing for the LTC2461CDD, drop-in alternative MPNs sharing the DFN-12 footprint, and practical design notes that supplement the manufacturer datasheet with selection guidance.
Alternatives de remplacement direct pour LTC2461CDD — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LTC2461CDD#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2461CMS#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2463CDD#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2461CDD#TRPBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2461IDD#PBF
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
LTC2400CS8#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2461CDD Valeurs maximales et caractéristiques électriques
| Résolution | 16 bits |
| Number of Channels | 1 (single-ended) |
| Input Range | 0 V to 1.25 V |
| ADC Architecture | Delta-Sigma |
| Supply Voltage (VDD) | 2.7 V to 5.5 V |
| Internal Reference Voltage | 1.25 V |
| Reference Temperature Coefficient | 10 ppm/°C max |
| Communication Interface | I2C (Standard 100 kHz / Fast 400 kHz) |
| Plage de température de fonctionnement | 0°C to +70°C (C grade) |
| Boîtier | 12-pin DFN (3x3 mm) |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant (PBF suffix) |
| Lead-Free | Yes (PBF suffix) |
Configuration des broches de LTC2461CDD
| Broche 1 | VDD — Positive power supply input (2.7 V to 5.5 V) |
| Broche 2 | IN+ — Analog input, single-ended (0 V to 1.25 V) |
| Broche 3 | GND — Analog ground reference |
| Broche 4 | REF — Internal reference bypass - connect 0.1 uF cap to GND |
| Broche 5 | CA — Chip address / enable input (selects I2C address) |
| Broche 6 | SCL — I2C serial clock input |
| Broche 7 | SDA — I2C serial data input/output |
| Broche 8 | SDO — Serial data output (SPI mode / I2C address select) |
| Broche 9 | GND — Digital ground |
| Broche 10 | NC — Not connected (per datasheet) |
| Broche 11 | NC — Not connected (per datasheet) |
| Broche 12 | EPAD — Exposed pad - connect to GND for thermal and electrical grounding |
Applications typiques
LTC2461CDD convient pour 6 applications: Portable Weighing Scales and Force Sensors, Thermocouple and Temperature Data Loggers, Industrial Process Control Sensor Front-Ends, Battery-Powered IoT Sensor Nodes, pH and Chemical Sensor Readout, Medical and Wearable Health Monitors.
Portable Weighing Scales and Force Sensors
The LTC2461CDD is well-matched to portable weighing scale and force-sensor front-ends because its 16-bit no-missing-codes resolution and integrated 1.25 V reference with 10 ppm/°C drift translate bridge-exciter voltage directly into stable digital counts. Placed between a 1-3 mV/V load cell and a microcontroller, the ADC removes the need for an external precision reference and minimizes external components. Its single-cycle conversion and automatic sleep current keep battery life above 1,000 hours on a single CR2032 coin cell. The DFN-12 (3x3 mm) footprint fits inside a 1 cm² scale platform PCB.
Recommandé
Thermocouple and Temperature Data Loggers
The LTC2461CDD suits thermocouple and RTD-based temperature data loggers thanks to its low input-referred noise, 16-bit resolution, and integrated precision reference. Combined with a chopper-stabilized op-amp front-end and on-board cold-junction compensation, the ADC supports Type K, J, and T thermocouples with sub-1°C accuracy after linearization. Its I2C interface allows up to two devices on one bus via the CA pin, enabling multi-zone monitoring from a single host. The 0°C to +70°C commercial range is sufficient for indoor logger enclosures, while the LTC2461IDD#PBF variant extends to -40°C to +85°C for outdoor use.
Recommandé
Industrial Process Control Sensor Front-Ends
The LTC2461CDD is a strong fit for 4-20 mA loop-powered or low-voltage analog sensor front-ends in industrial control systems. Its 0 V to 1.25 V input range accepts the output of low-voltage pressure, flow, and level sensors after resistive scaling, and the integrated reference removes drift concerns over 0°C to +70°C ambient. The 12-DFN package is small enough to mount inside sensor housings, and the I2C bus allows the ADC to share a 2-wire link with a microcontroller, EEPROM, and display. For higher-side common-mode rejection, the LTC2463 differential variant is pin-compatible.
Recommandé
Battery-Powered IoT Sensor Nodes
The LTC2461CDD is ideal for battery-powered IoT sensor nodes thanks to its automatic sleep between conversions and ultra-low quiescent current, which enables multi-year battery life on a single coin cell. Its 16-bit resolution and 1.25 V internal reference are sufficient for soil moisture, light, gas, and temperature sensors commonly used in smart agriculture and building automation. The 12-DFN footprint leaves room for a 2.4 GHz wireless SoC and antenna on the same 1.5 x 1.5 cm sensor module. The I2C interface pairs naturally with low-power MCUs and BLE SoCs.
Recommandé
pH and Chemical Sensor Readout
The LTC2461CDD supports pH and ion-selective electrode readout when paired with a high-impedance JFET or chopper op-amp front-end. Its 1.25 V input range and 16-bit resolution are well-matched to the 0-500 mV pH probe output, providing 0.01 pH resolution after temperature compensation. The integrated low-drift reference simplifies the calibration routine, and the I2C interface allows the ADC to be embedded in a submersible water-quality probe. The 12-DFN (3x3 mm) footprint is small enough to fit inside the probe handle alongside the microcontroller.
Recommandé
Medical and Wearable Health Monitors
The LTC2461CDD is a fit for wearable health monitors - including pulse oximeters, ECG patches, and continuous glucose monitors - where its small 3x3 mm DFN package and ultra-low sleep current are critical. The integrated precision reference removes the need for a separate reference IC, reducing the bill of materials and PCB area in a space-constrained wearable form factor. Its 16-bit resolution is sufficient for heart-rate and SpO2 calculation after the analog front-end has amplified the biopotential signal. The I2C interface pairs with low-power BLE SoCs common in wearable designs.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LTC2461CDD — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LTC2461CDD#PBF | LTC2463CDD#PBF | LTC2461IDD#PBF | LTC2461CDD#TRPBF | LTC2461CMS#PBF |
|---|---|---|---|---|---|---|
| Package | 12-DFN (3x3 mm) | 12-DFN (3x3 mm) - same | 12-DFN (3x3 mm) - same | 12-DFN (3x3 mm) - same | 12-DFN (3x3 mm) - same | 12-MSOP - different |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| Input Range | 0 V to 1.25 V (single-ended) | 0 V to 1.25 V (single-ended) | +/-1.25 V (differential) | 0 V to 1.25 V (single-ended) | 0 V to 1.25 V (single-ended) | 0 V to 1.25 V (single-ended) |
| Interface | I2C | I2C | I2C | I2C | I2C | I2C |
| Internal Reference | 1.25 V / 10 ppm/°C | 1.25 V / 10 ppm/°C | 1.25 V / 10 ppm/°C | 1.25 V / 10 ppm/°C | 1.25 V / 10 ppm/°C | 1.25 V / 10 ppm/°C |
| Operating Temperature | 0°C to +70°C | 0°C to +70°C | 0°C to +70°C | -40°C to +85°C | 0°C to +70°C | 0°C to +70°C |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
Principaux différenciateurs
- Integrated 1.25 V reference with 10 ppm/°C max drift (vs External reference design with discrete ADC)
- Ultra-tiny 12-DFN (3x3 mm) package (vs LTC2400CS8#PBF (8-SOIC))
- Pin-compatible upgrade to differential input (vs LTC2461CMS#PBF (MSOP-12))
Notes de conception
Decouple VDD (Pin 1) with a 0.1 µF X7R ceramic capacitor placed within 3 mm of the pin. The integrated 1.25 V reference is ratiometric to VDD, so a clean, low-noise VDD improves ADC noise performance. For battery-powered designs, route the VDD trace through a ferrite bead to suppress switching noise from a co-located BLE SoC. The part automatically enters sleep between conversions, so average current is dominated by the conversion active window and the I2C pull-up sizing.
The exposed pad (Pin 12 / EPAD) MUST be soldered to a grounded copper pour to provide the lowest thermal resistance and a clean ground reference. Use at least 4 thermal vias (0.3 mm drill) stitching the EPAD to the inner ground plane. Keep the analog input trace (Pin 2) as short as possible and surround it with a ground guard ring to prevent digital switching noise coupling from the I2C bus. A 0.1 µF bypass on the REF pin (Pin 4) is mandatory per the datasheet for noise-free conversions.
Do not apply an input signal greater than VDD or below GND - the analog input is not over-voltage protected. For signals above 1.25 V, use a resistive divider or front-end amplifier. The CA (chip address) pin must be tied to GND, VDD, SCL, or SDA to select one of four valid I2C addresses; leaving it floating causes indeterminate behavior. Avoid routing the SDA/SCL traces over the analog input or reference traces to minimize digital-to-analog crosstalk. The LTC2461 is single-ended only; for differential inputs use the LTC2463 in the same DFN-12 footprint.
Informations de conformité
RoHS and lead-free compliance confirmed by PBF suffix per Analog Devices / DigiKey product page. AEC-Q100 not applicable (commercial 0-70C grade, not automotive). Industrial grade LTC2461IDD#PBF available for -40 to +85C.
