LTC2415IGN - 24-Bit No Latency Delta Sigma ADC | Analog Devices
N.º de pieza: LTC2415IGN ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $14.2 | $14,20 |
| 10 | $12.85 | $128,50 |
| 100 | $11.05 | $1.105,00 |
| 500 | $9.45 | $4.725,00 |
| 1.000 | $8.29 | $8.290,00 |
LTC2415IGN Descripción general
A 24-bit delta-sigma ADC is a high-resolution converter that uses noise shaping and oversampling to achieve very high effective resolution at low sample rates. Delta-sigma ADCs are widely used in precision measurement, weighing scales, industrial process control, and temperature monitoring because they integrate a digital filter, modulator, and reference input in a single IC. Within the broader hierarchy, the LTC2415 belongs to the precision ADC category, itself part of the data converter product family under Analog Devices' signal-chain portfolio.
Key features include differential input common-mode voltage V(INCM) and differential reference common-mode voltage V(REFCM) that can be independently set anywhere between GND and VCC, enabling true ratiometric measurements. The single-pin mode selection offers better than 110 dB input differential-mode 50 Hz / 60 Hz noise rejection, while the integrated oscillator eliminates the need for an external clock crystal. The serial SPI / MICROWIRE-compatible interface simplifies connection to microcontrollers, FPGAs, and digital isolators.
The converter achieves single-cycle settling, which makes it suitable for multiplexed applications where input channels are switched between measurements. The integrated digital filter rejects line frequency noise by more than 110 dB in the 50 Hz / 60 Hz common-mode rejection mode, a key requirement for weighing scales and process instrumentation. The 0.23 ppm RMS noise floor and 2 ppm INL specification provide true 24-bit effective resolution for DC measurements.
Typical applications include precision weighing scales, industrial process control, strain-gauge transducers, thermocouple and RTD temperature measurement, and battery-cell voltage monitoring. The differential input structure makes the part well-suited to bridge-sensor signal conditioning and medical instrumentation front-ends.
When designing with the LTC2415IGN, observe the 2.7 V to 5.5 V supply range and place 0.1 µF bypass capacitors near the VCC pin to minimise digital noise coupling. For best 50/60 Hz rejection, hold the FO pin high and ground the CS pin to enter 110 dB common-mode rejection mode; the digital interface timing should respect the 256 ms conversion period at the maximum output rate of approximately 15 samples per second.
This page synthesises distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found on the manufacturer datasheet alone, providing an actionable engineering reference for selecting and implementing the LTC2415IGN.
Alternativas directas para LTC2415IGN — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con LTC2415IGN (mismo factor de forma y huella) — difiere en Integrated Oscillator, Operating Temperature, Package, RMS Noise, Resolution.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
LTC2415-1IGN
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC2415CGN#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC2415IGN#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC2415IGN#TRPBF
✅ Sustitución directa✓ En stock
$9.1 / unidad
Ver hoja de datos →LTC2413IGN
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC2400IGN
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC2415IGN Valores máximos y características eléctricas
| Resolución | 24 bits |
| Converter Type | Delta-Sigma (Sigma-Delta), No Latency |
| Number of Channels | 1 differential input |
| Input Type | Differential |
| Reference Type | Differential (external) |
| Supply Voltage (VCC) | 2.7 V to 5.5 V |
| INL (Integral Non-Linearity) | 2 ppm |
| RMS Noise | 0.23 ppm (effective input-referred) |
| Effective Output Rate | 15 samples/second |
| Common-Mode Rejection (FO=H) | >110 dB at 50 Hz/60 Hz |
| Settling Time | Single cycle (no latency) |
| Integrated Oscillator | Yes (internal, no external crystal required) |
| Digital Interface | SPI, MICROWIRE-compatible serial |
| Encapsulado | 16-SSOP (0.154 inch / 3.90 mm body width) |
| Tipo de montaje | Surface Mount |
| Temperatura de funcionamiento | -40 C to +85 C (industrial) |
| Estado RoHS | Compliant (#PBF suffix indicates Pb-free) |
Configuración de pines de LTC2415IGN
| Pin 1 | VCC — Power supply input (2.7 V to 5.5 V) |
| Pin 2 | VREF+ — Positive differential reference input |
| Pin 3 | VREF- — Negative differential reference input |
| Pin 4 | GND — Ground |
| Pin 5 | IN+ — Positive differential analog input |
| Pin 6 | IN- — Negative differential analog input |
| Pin 7 | COM — Common-mode voltage buffer output (for ratiometric biasing) |
| Pin 8 | FO — Frequency output / common-mode rejection mode select (FO=H gives 110 dB 50/60 Hz rejection on LTC2415) |
| Pin 9 | CS — Chip select (active low) |
| Pin 10 | SCK — Serial clock input |
| Pin 11 | SDO — Serial data output |
| Pin 12 | SDI — Serial data input (tie low for ADC-only mode) |
| Pin 13 | EXT — External clock select (tie low to use internal oscillator) |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | NC — Not connected (per datasheet) |
| Pin 16 | NC — Not connected (per datasheet) |
Aplicaciones típicas
LTC2415IGN es adecuado para 7 aplicacións: Precision Weighing Scales, Strain-Gauge and Bridge Sensor Signal Conditioning, Thermocouple and RTD Temperature Measurement, Industrial Process Control Instrumentation, Battery Cell Voltage Monitoring, Medical Instrumentation Front-End, Precision Data Acquisition Modules.
Precision Weighing Scales
The LTC2415IGN's true differential input and 110 dB common-mode 50 Hz/60 Hz rejection make it an ideal ADC for precision weighing scales. The 24-bit resolution and 2 ppm INL allow direct digitisation of full-bridge load-cell signals without instrumentation amplifiers, simplifying the analog front-end. Connect the load-cell excitation directly to VCC and use ratiometric measurement between VREF+ and the cell excitation - any supply drift cancels automatically. The 15 samples/second output rate suits slow-moving scale applications, while 0.23 ppm RMS noise provides sub-milligram repeatability for industrial bench scales. Single-cycle no-latency settling enables multiplexed multi-channel scale platforms. Per Analog Devices application notes, weigh-scale designers typically pair the LTC2415 with a precision bridge excitation reference such as the LT1019 to achieve 20-bit+ effective resolution.
Recomendado
Strain-Gauge and Bridge Sensor Signal Conditioning
The LTC2415IGN directly digitises differential bridge outputs from strain gauges and pressure sensors without requiring an external instrumentation amplifier. The differential reference input supports ratiometric measurements where drift in the bridge excitation voltage is rejected by the common-mode rejection ratio of the converter. With 0.23 ppm RMS noise and 24-bit resolution, the LTC2415 can resolve micro-strain levels in structural-health-monitoring and load-monitoring applications. The internal digital filter rejects line-frequency interference by more than 110 dB when FO is held high, allowing direct connection to 50 Hz/60 Hz mains-powered transducers without additional shielding. Industrial strain-gauge signal chains built around this ADC typically achieve better than 0.1 percent full-scale accuracy.
Recomendado
Thermocouple and RTD Temperature Measurement
The LTC2415IGN's high resolution and integrated digital filtering make it well suited to thermocouple and RTD temperature measurement systems. Thermocouple cold-junction compensation and RTD ratiometric measurements both rely on accurate differential ADC sampling with high common-mode rejection. The 24-bit resolution resolves sub-0.01 C temperature changes when digitising PT100/PT1000 RTD voltage dividers. The microamp-level quiescent current extends battery life in portable thermometry. The 110 dB 50/60 Hz rejection meets the EMC requirements of industrial temperature controllers. Reference designs pair the LTC2415 with precision current sources and low-drift references such as the LT1021.
Recomendado
Industrial Process Control Instrumentation
The LTC2415IGN is designed into 4-20 mA loop-powered process transmitters, panel meters, and PLC analog input modules where 24-bit resolution and high common-mode rejection are mandatory. The 2.7 V to 5.5 V supply range covers loop-powered designs, and the serial SPI output simplifies isolation with digital isolators such as the Analog Devices ADuM1411. Differential input rejects ground-loop noise in long-cable industrial installations, while the integrated oscillator saves PCB area in compact DIN-rail modules. The 16-SSOP footprint and industrial temperature grade (-40 C to +85 C) meet the harsh-environment requirements of process control cabinets.
Recomendado
Battery Cell Voltage Monitoring
The LTC2415IGN is ideal for battery-cell voltage monitoring in multi-cell battery management systems where each cell voltage must be measured with high accuracy. The differential input measures directly across each cell, and the differential reference allows ratiometric measurement from the cell stack to eliminate ground-loop errors. The microamp-level quiescent current minimises drain on the battery pack while idle. The 24-bit resolution provides microvolt-level accuracy needed for coulomb counting and state-of-charge estimation. The 16-SSOP footprint fits small cell-monitoring PCBs commonly used in electric vehicles and energy-storage systems.
Recomendado
Medical Instrumentation Front-End
The LTC2415IGN's 24-bit resolution and 0.23 ppm RMS noise suit medical instrumentation front-ends such as ECG, EEG, and bio-impedance measurement circuits. Differential inputs reject common-mode 50/60 Hz interference from the patient's body and from mains-powered equipment, while the integrated digital filter eliminates line-frequency noise by more than 110 dB. The microamp-level quiescent current extends battery life in portable patient monitors. The 2 ppm INL specification ensures accurate reading of small bio-electric signals, and the SPI interface simplifies connection to low-power microcontrollers. Reference designs integrate the LTC2415 with low-noise analog front-ends built around the AD8220 instrumentation amplifier.
Recomendado
Precision Data Acquisition Modules
The LTC2415IGN is used as the core ADC in USB-based and Ethernet-based precision data-acquisition modules for laboratory and test-bench applications. The serial SPI interface connects directly to MCU/FPGA controllers and to digital isolators for USB-isolated DAQs. Differential measurement capability rejects common-mode noise on long test leads, while the 24-bit no-latency settling allows single-channel or multiplexed measurements with rapid step response. Reference designs combine the LTC2415 with a precision 5 V reference and a low-noise LDO such as the LT3042 to achieve 20-bit+ effective resolution in cost-sensitive test-and-measurement products.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LTC2415IGN — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LTC2415-1IGN | LTC2415CGN#PBF | LTC2413IGN | LTC2400IGN |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 16-SSOP | 16-SSOP - same | 16-SSOP - same | 16-SSOP - same | 16-SSOP - same |
| Resolution | 24 bits | 24 bits | 24 bits | 24 bits | 24 bits |
| Input Configuration | Differential | Differential | Differential | Differential | Single-ended |
| Operating Temperature | -40 C to +85 C (industrial) | -40 C to +85 C | 0 C to +70 C (commercial) | -40 C to +85 C | -40 C to +85 C |
Diferenciadores clave
- True differential input and differential reference (frente a LTC2400IGN)
- 110 dB simultaneous 50 Hz and 60 Hz rejection (frente a LTC2415-1IGN)
- Industrial temperature grade by default (frente a LTC2415CGN#PBF)
- Single-cycle no-latency settling (frente a Generic 24-bit sigma-delta ADCs with sinc3 filters)
Notas de diseño
The LTC2415IGN operates from a single 2.7 V to 5.5 V supply. Place a 0.1 µF ceramic bypass capacitor as close as possible to the VCC pin (pin 1), with a 1 µF to 10 µF bulk capacitor nearby to supply the modulator's switching currents. Use a low-noise LDO such as the LT3042 or ADP150 to power the analog supply rail, sharing the same ground as the digital interface. For ratiometric designs, derive both VCC and VREF from the same low-noise reference so that any supply drift cancels in the differential measurement.
To achieve greater than 110 dB 50 Hz/60 Hz common-mode rejection, tie the FO pin high and ground the CS pin (or hold it low continuously in microcontroller mode). This enables the digital SINC4 filter to reject both line frequencies simultaneously, which is critical for weighing-scale and process-control applications. If only 50 Hz rejection is needed, an LTC2415-1 variant can be used; refer to datasheet document 2415fa for FO/CS logic truth table. Maintain a clean VREF common-mode voltage by buffering with a low-noise op-amp if the source impedance exceeds 10 ohm.
Use a single solid analog ground plane under the LTC2415IGN and its reference circuitry, and route the digital SPI signals (SCK, SDO, SDI, CS) on a separate layer or keep them short and isolated. The differential analog inputs (IN+ and IN-) should be routed as a matched-length pair to preserve common-mode rejection; twisting or shielding the input pair reduces RF pickup. Place the 0.1 µF bypass capacitors within 3 mm of the VCC and VREF pins to minimise supply-noise coupling. If using the COM pin to bias a bridge, buffer it with a low-impedance op-amp rather than driving load directly.
Do not leave the EXT pin floating - tie it low to use the integrated oscillator, or drive it with an external CMOS clock if a different sample rate is required. Failing to set the FO pin high in 110 dB common-mode rejection mode will reduce 50/60 Hz rejection to approximately 87 dB. The SDI pin must be tied low in ADC-only mode to avoid spurious conversions. Avoid using long cables between the analog input and the ADC without ESD protection or input filtering, as the LTC2415IGN's differential inputs are sensitive to ESD strikes above 1 kV HBM without external protection.
Información de cumplimiento
The #PBF and #TRPBF suffixes indicate Pb-free RoHS-compliant packaging per Analog Devices' ordering nomenclature. Industrial temperature grade (-40 C to +85 C) is not automotive-qualified; AEC-Q100 is not applicable for this part number.
