LTC2486IDE#TR - 16-Bit 4-Ch Delta-Sigma ADC w/ PGA | ADI
N.º de pieza: LTC2486IDE#TR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.92 | $4,92 |
| 10 | $4.45 | $44,50 |
| 100 | $3.96 | $396,00 |
| 500 | $3.58 | $1.790,00 |
| 1.000 | $3.21 | $3.210,00 |
LTC2486IDE#TR Descripción general
An ADC (analog-to-digital converter) is a data acquisition integrated circuit that converts continuous analog voltage signals into discrete digital codes for processing by microcontrollers, FPGAs, or DSPs. Delta-Sigma (ΔΣ) ADCs use oversampling and noise-shaping to achieve high resolution at the cost of conversion speed. Within the broader hierarchy, the LTC2486 sits as: ADC -> data converter -> data acquisition IC -> signal chain IC -> semiconductor. The "No Latency" feature guarantees that the first conversion after a new channel selection is valid, simplifying multiplexed measurements versus conventional delta-sigma ADCs that require settling cycles.
Key features include 16-bit resolution with no missing codes, an integrated programmable gain amplifier, wide common-mode input range (0V to VCC) independent of the reference voltage, simultaneous 50Hz/60Hz rejection, and an external differential reference input. Easy Drive technology permits rail-to-rail inputs with source impedances up to several kilohms, eliminating the need for on-chip input buffers and their charge-kickback errors.
The internal architecture combines a third-order delta-sigma modulator, a sinc4 digital filter, and an on-chip oscillator. The integrated PGA (gain 1 to 256) lets low-level sensor signals (such as thermocouples or strain gauges) be amplified before conversion. The serial interface (SPI) supports daisy-chain connection of multiple LTC2486 devices on a single bus. Reference voltage can be differential and ratiometric to the analog supply.
Typical applications include direct thermocouple digitization with cold-junction compensation, bridge pressure transducers, weight scales, industrial temperature measurement, gas sensors, and battery cell monitoring. The wide common-mode range makes it ideal for any single-ended or differential sensor with ground-referenced signals. In multi-channel data-acquisition boards the LTC2486's per-channel valid-first-conversion behavior simplifies firmware because the controller does not have to discard dummy conversions after switching MUX channels.
A key design consideration is choosing the reference voltage: lower reference (e.g., 100mV to 1V) combined with PGA gain maximizes dynamic range for low-level signals, while a higher reference (up to VCC) maximizes absolute accuracy. The DFN-14 package requires careful PCB layout with a low-impedance ground pour under the exposed pad (pin 14) for thermal dissipation and noise immunity.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers select, source, and implement the LTC2486IDE#TR with confidence.
Alternativas directas para LTC2486IDE#TR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
LTC2486CDE#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC2486IDE#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC2484IDE#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC2485IDE#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC2483IDE#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC2486IDE#TR Valores máximos y características eléctricas
| Resolución | 16 bits |
| Number of Channels | 4 (single-ended) / 2 (differential) |
| Converter Type | Delta-Sigma (No Latency ΔΣ) |
| Input Type | Single-ended or differential, rail-to-rail |
| Common-Mode Input Range | 0 V to VCC (independent of VREF) |
| Common-Mode Rejection | 110 dB at 50 Hz / 60 Hz |
| Output Update Rate | 6.8 Hz to 15 Hz (user-controlled) |
| Integrated PGA Gain | 1 to 256 |
| Interfaz | SPI / serial |
| Reference | External differential |
| Analog Supply Voltage | 2.7 V to 5.5 V |
| Digital Supply Voltage | 2.7 V to 5.5 V |
| Rango de temperatura de funcionamiento | -40 C to +85 C |
| Encapsulado | 14-pin DFN (4 mm x 3 mm) |
| Tipo de montaje | Surface Mount |
| Nivel MSL | 1 (unlimited) |
| Estado RoHS | Compliant |
Configuración de pines de LTC2486IDE#TR
| Pin 1 | VCC — Analog and digital supply voltage (2.7 V to 5.5 V) |
| Pin 2 | GND — Ground reference |
| Pin 3 | CS — Active-low chip select / serial-interface control |
| Pin 4 | SCK — Serial clock input |
| Pin 5 | SDO — Serial data output (MISO) |
| Pin 6 | SDI — Serial data input (MOSI) for configuration |
| Pin 7 | F0 — Frequency-select pin (sets output data rate and 50/60 Hz rejection mode) |
| Pin 8 | IN1+ — Differential analog input channel 1, positive |
| Pin 9 | IN1- — Differential analog input channel 1, negative (or IN2 single-ended) |
| Pin 10 | IN2+ — Differential analog input channel 2, positive (or IN3 single-ended) |
| Pin 11 | IN2- — Differential analog input channel 2, negative (or IN4 single-ended) |
| Pin 12 | REF+ — Differential reference input, positive |
| Pin 13 | REF- — Differential reference input, negative |
| Pin 14 | EP — Exposed pad - thermal and electrical ground (must be soldered to PCB ground) |
Aplicaciones típicas
LTC2486IDE#TR es adecuado para 6 aplicacións: Thermocouple Temperature Measurement, Strain-Gauge Bridge Pressure Sensors, Industrial Weighing Scales and Load Cells, Battery Cell Voltage Monitoring (BMS), Gas and Environmental Sensor Digitization, Medical Patient Monitoring and Diagnostic Equipment.
Thermocouple Temperature Measurement
The LTC2486IDE#TR is purpose-built for direct thermocouple digitization in industrial temperature monitoring systems. Its integrated PGA (gain 1 to 256) amplifies the low millivolt-level thermocouple outputs (typically 0-50 mV) to fill the ADC input range, eliminating the need for external instrumentation amplifiers. Easy Drive input current cancellation permits direct connection to thermocouples with source impedances up to several kilohms. The simultaneous 50 Hz / 60 Hz mains-line rejection is critical for industrial environments where power-line interference would otherwise swamp the small thermocouple signal. Multi-channel scanning benefits from the No Latency Delta-Sigma architecture: when switching between type-K, type-J, and type-T thermocouples, the first conversion is valid, so the firmware does not need to schedule dummy cycles - this simplifies real-time loop timing and reduces effective scan time. Cold-junction compensation is handled by an external silicon-diode or RTD measured on a separate LTC2486 channel.
Recomendado
Strain-Gauge Bridge Pressure Sensors
The LTC2486IDE#TR digitizes the differential output of Wheatstone-bridge strain gauges in load cells, pressure transducers, and flow meters with integrated gain. Bridge pressure sensors typically produce 1-3 mV/V differential signals (e.g., 5-15 mV at 5 V excitation), well within the LTC2486's range when PGA gain of 64 or 128 is selected. Easy Drive technology eliminates the input-current kickback errors of conventional delta-sigma ADCs, allowing direct connection to the bridge without buffering. The differential reference capability permits ratiometric measurement: tying the bridge excitation voltage to the reference input cancels excitation-supply drift, a critical feature for precision scales where temperature-coefficient drift would otherwise dominate the error budget. The 14-pin DFN package (4x3 mm) suits compact PCBAs inside sensor housings.
Recomendado
Industrial Weighing Scales and Load Cells
The LTC2486IDE#TR is ideal for digital weighing scales and platform scales where the LTC2486's ratiometric measurement, integrated PGA, and 16-bit resolution deliver consistent results across the operating temperature range. Industrial weighing scales require high noise rejection because the load-cell output is millivolts and the system is exposed to motor, relay, and inverter noise. The LTC2486's 110 dB common-mode rejection at 50/60 Hz ensures that common-mode noise on the bridge (e.g., from ground loops or thermal EMFs) does not affect readings. Multiple load cells can be summed into a single LTC2486 differential input, or four individual cells can be read through the four single-ended channels. The DFN-14 package and SPI interface fit on small-scale-controller boards running on Cortex-M0 or MSP430 MCUs.
Recomendado
Battery Cell Voltage Monitoring (BMS)
The LTC2486IDE#TR monitors individual battery cell voltages in battery management systems for Li-ion, LiFePO4, and lead-acid packs. Its wide common-mode input range (0 V to VCC) independent of the reference allows direct measurement of cells stacked above the ADC supply voltage when level-shift resistor dividers are used. The integrated PGA amplifies small voltage variations (e.g., cell balancing at 3.3 V +/- 50 mV) to use the full ADC dynamic range. Easy Drive technology is critical here: the cell-monitoring muxes have significant on-resistance (tens of ohms), and Easy Drive tolerates this source impedance without introducing gain errors. Four channels permit monitoring of four cells with one chip; for higher-cell-count packs (e.g., 16S Li-ion), multiple LTC2486 devices can be daisy-chained on the SPI bus with no additional pins.
Recomendado
Gas and Environmental Sensor Digitization
The LTC2486IDE#TR digitizes the output of electrochemical gas sensors (O2, CO, NO2, H2S) and environmental sensors (humidity, pH, conductivity) where the sensor output is a low-amplitude signal requiring high-resolution conversion. Electrochemical gas sensors typically output nanoampere-to-microampere currents that require transimpedance amplification; the LTC2486's PGA can directly amplify the resulting millivolt-scale voltage after a transimpedance stage, eliminating a dedicated instrumentation amplifier. The simultaneous 50/60 Hz rejection is essential for industrial-environment sensor arrays where motor and HVAC noise couples into the sensor signal. Multi-channel scanning of gas-sensor arrays benefits from the No Latency architecture - sensor-channel switches yield valid data on the first conversion, supporting faster response time for safety-critical gas detection.
Recomendado
Medical Patient Monitoring and Diagnostic Equipment
The LTC2486IDE#TR is well suited to medical diagnostic and patient-monitoring equipment including infusion pumps, blood-pressure monitors, and pulse-oximetry front-ends where low-noise, high-resolution signal acquisition is required. Its small 14-pin DFN (4x3 mm) footprint suits compact wearable or handheld medical device enclosures. The integrated PGA directly amplifies the low-level signals from bio-sensors (e.g., pulse-oximeter photodiode currents, ECG electrode potentials), and Easy Drive technology permits direct connection to high-impedance bio-sensors without additional buffer amplifiers. The simultaneous 50/60 Hz rejection is critical in medical environments where mains interference would otherwise corrupt diagnostic measurements. Note: medical-safety certification (IEC 60601) is system-level and not provided by the ADC.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LTC2486IDE#TR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LTC2486CDE#PBF | LTC2486IDE#PBF | LTC2484IDE#PBF | LTC2485IDE#PBF | LTC2483IDE#PBF |
|---|---|---|---|---|---|---|
| Package | 14-pin DFN (4x3) | 14-pin DFN (4x3) - same | 14-pin DFN (4x3) - same | 14-pin DFN (4x3) - same | 14-pin DFN (4x3) - same | 14-pin DFN (4x3) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bits | 16 bits | 16 bits | 16/24 bits (selectable) | 24 bits | 24 bits |
| Number of Channels | 4 SE / 2 diff | 4 SE / 2 diff | 4 SE / 2 diff | 4 SE / 2 diff | 4 SE / 2 diff | 1 SE / 1 diff |
| Integrated PGA | Yes (1 to 256) | Yes (1 to 256) | Yes (1 to 256) | No (fixed gain 1) | Yes (1 to 256) | Yes (1 to 256) |
| Easy Drive Technology | Yes | Yes | Yes | Yes | Yes | Yes |
| Temperature Range | -40 C to +85 C (Industrial) | 0 C to +70 C (Commercial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| 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 |
| Interface | SPI serial | SPI serial | SPI serial | SPI serial | SPI serial | SPI serial |
Diferenciadores clave
- No Latency Delta-Sigma architecture - first conversion after channel switch is valid (frente a LTC2484IDE#PBF)
- Integrated PGA with gain 1 to 256 - direct digitization of low-level signals (frente a LTC2484IDE#PBF)
- Easy Drive input current cancellation - rail-to-rail inputs with high source impedance (frente a ADS1118 (TI cross-architecture equivalent))
- Industrial temperature grade -40 C to +85 C (frente a LTC2486CDE#PBF)
- Wide common-mode input range independent of VREF (frente a LTC2486CDE#PBF)
Notas de diseño
The LTC2486IDE#TR 14-pin DFN package has an exposed thermal/electrical pad on pin 14. This pad must be soldered directly to a low-impedance ground pour on the top layer of the PCB to provide both thermal dissipation and a clean ground reference. Use multiple thermal vias (at least 5 vias in a 1.2 mm pitch grid) under the pad to connect the top-layer ground pour to an internal ground plane. Without proper pad soldering, the ADC's noise performance degrades noticeably because the exposed pad carries the substrate bias and serves as the analog ground return path.
Place input traces for IN1+, IN1-, IN2+, IN2- and the reference traces REF+ and REF- as differential pairs with matched lengths and a constant 50-100 ohm differential impedance. Route these pairs away from digital lines (CS, SCK, SDO, SDI) to minimize digital-to-analog crosstalk. Keep the analog and digital sections of the PCB physically separated, and use a star-ground topology where the ADC ground pin connects directly to the system ground at one point to avoid ground-loop noise. The reference voltage source should be located within 10 mm of the REF+ and REF- pins to minimize reference-input noise pickup.
Do not exceed the absolute maximum analog input voltage of VCC + 0.3 V or go below GND - 0.3 V on any IN+ or IN- pin, as this can cause latch-up. Ensure the reference voltage (REF+ - REF-) is between 0.1 V and VCC for proper operation. When using a single-ended input configuration, connect the unused negative input (IN-) to a clean analog ground, not a digital ground. The F0 pin state at power-up determines the output data rate and 50/60 Hz rejection mode; ensure F0 is pulled to the correct logic level before CS goes low to start the first conversion. Allow at least one conversion cycle to elapse after power-up before reading data to ensure the internal calibration completes.
The LTC2486's Easy Drive technology permits direct connection to sensors having source impedances up to several kilohms, but the input current is automatically cancelled on each conversion cycle. To achieve the best noise performance with very-high-impedance sources (>10 kohm), add 100 pF to 1 nF ceramic capacitors on each input pin close to the ADC to filter RF noise without slowing the input-settling time. For bridge sensors, connect the bridge excitation voltage directly to the REF+ and REF- pins (ratiometric mode) so that any drift or noise on the excitation cancels out, yielding the best temperature-coefficient and noise performance.
Información de cumplimiento
RoHS compliant per Analog Devices product page. #TR denotes tape-and-reel packaging per ADI/Linear Technology convention. Lead-free (Pb-free) reflow-compatible. AEC-Q100 not applicable - this is a general-purpose industrial ADC, not an automotive-qualified part.
