LTC2493IDE - 24-Bit 4-Ch Delta-Sigma ADC with Easy Drive | ADI
N.º da peça: LTC2493IDE ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $11.2 | $11,20 |
| 10 | $10.05 | $100,50 |
| 100 | $8.62 | $862,00 |
| 500 | $7.42 | $3.710,00 |
| 1.000 | $6.55 | $6.550,00 |
LTC2493IDE Visão geral
A delta-sigma (ΔΣ) ADC is a type of oversampling converter that uses noise-shaping and digital filtering to achieve very high resolution at low sample rates. It belongs to the broader hierarchy of analog-to-digital converters → data converters → mixed-signal ICs → semiconductors, and is widely used in precision measurement where DC accuracy and noise rejection matter more than raw speed. The Easy Drive input current cancellation scheme of the LTC2493 eliminates dynamic input current errors that plague conventional delta-sigma ADCs, removing the need for on-chip input buffers and their associated offset/settling trade-offs.
Key features include 24-bit no-latency operation, automatic offset and full-scale calibration every conversion cycle independent of input channel, 2-wire I2C interface, integrated temperature sensor, and an external fO clock pin that allows the user to override the internal conversion clock to change output rate and digital filter notch placement. The device operates from a single 2.7 V to 5.5 V supply with low supply current suited to battery-powered instrumentation.
The architecture combines a multi-order delta-sigma modulator with a SINC4 digital filter, achieving excellent 50 Hz/60 Hz power-line rejection at default output rates and the ability to reject 50 Hz/60 Hz interference at custom rates by driving fO. The first conversion after a channel change is valid to full specification.
Typical applications include precision weigh scales, strain-gauge bridges, thermocouple temperature measurement, industrial process control, and battery-powered portable instrumentation. The wide common-mode range and Easy Drive inputs make the LTC2493IDE particularly attractive for direct connection to resistive sensors and low-voltage bridges.
Design consideration: drive the LTC2493IDE with a low-thermal-reference such as the LTC6655, and route the analog ground as a separate pour. Use a 0.1 µF ceramic bypass capacitor within a few millimeters of the supply pin to preserve noise performance.
This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes that are not found in the manufacturer datasheet alone.
Alternativas drop-in para LTC2493IDE — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
LTC2493CDE#PBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC2493IDE#TRPBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC2492IDE#PBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC2493I#PBF
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
LTC2493IDE Classificações máximas e características elétricas
| Resolução | 24 bit |
| Number of Input Channels | 2 differential / 4 single-ended |
| Architecture | Sigma-Delta (ΔΣ) with Easy Drive input current cancellation |
| Interface | I2C (2-wire) |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Common-Mode Input Range | 0 V to VCC (independent of reference) |
| Integrated Temperature Sensor | 1/30 °C resolution, 2 °C absolute accuracy |
| Calibration | Automatic offset and full-scale calibration every conversion |
| No-Latency Operation | Yes (first conversion after channel change is valid) |
| External Clock Input (fO) | Yes, allows override of internal conversion clock |
| Tensão de referência | External (see datasheet) |
| Encapsulamento | 14-pin DFN (4 mm x 3 mm) |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant (PBF suffix indicates Pb-free) |
| Lead-Free (PBF) | Yes (LTC2493IDE#PBF) |
Configuração de pinos do LTC2493IDE
| Pino 1 | GND — Ground |
| Pino 2 | CA0 — Chip address select bit 0 (LOW/HIGH/floating) |
| Pino 3 | CA1 — Chip address select bit 1 (LOW/HIGH/floating) |
| Pino 4 | REF+ — Positive reference input |
| Pino 5 | REF- — Negative reference input |
| Pino 6 | IN+1 — Positive analog input, channel 1 |
| Pino 7 | IN-1 — Negative analog input, channel 1 |
| Pino 8 | IN+2 — Positive analog input, channel 2 |
| Pino 9 | IN-2 — Negative analog input, channel 2 |
| Pino 10 | IN+3 — Positive analog input, channel 3 |
| Pino 11 | IN-3 — Negative analog input, channel 3 |
| Pino 12 | IN+4 — Positive analog input, channel 4 |
| Pino 13 | fO — External conversion-clock override input |
| Pino 14 | VCC — Supply voltage (2.7 V to 5.5 V) |
Aplicações típicas
LTC2493IDE é adequado para 6 aplicaçãos: Precision Weigh Scales, Thermocouple Temperature Measurement, Strain-Gauge Bridge Sensor Conditioning, Industrial Process Control Instrumentation, Battery-Powered Portable Instrumentation, Direct Sensor Digitization (RTD, Thermistor).
Precision Weigh Scales
The LTC2493IDE is well suited to precision weigh-scale front ends where a load-cell bridge delivers a differential millivolt-level signal with high source impedance. Easy Drive input current cancellation removes dynamic currents that would otherwise settle into the bridge, while the 24-bit resolution and automatic per-conversion calibration eliminate gain and offset drift across temperature. Placed between a 4-wire strain-gauge bridge and the host MCU via I2C, the part achieves better than 10 nV noise per conversion at low output rates and rejects 50 Hz/60 Hz mains pickup by default.
Recomendado
Thermocouple Temperature Measurement
In thermocouple-based temperature acquisition, the LTC2493IDE integrates the cold-junction compensation sensor and the high-resolution ADC on the same die, removing the need for a separate thermistor or dedicated temperature IC. The Easy Drive inputs source negligible input current, eliminating the thermoelectric errors introduced by conventional multiplexed delta-sigma ADCs. With a Type K thermocouple referenced to the on-chip temperature sensor, the part delivers better than 0.1 °C measurement repeatability when paired with a low-thermal-emf connector.
Recomendado
Strain-Gauge Bridge Sensor Conditioning
Full-bridge and half-bridge strain gauges produce differential outputs with common-mode voltages that can swing close to either rail. The LTC2493IDE accepts any common-mode input from 0 V to VCC independent of the reference voltage, allowing direct connection to bridges biased at the ADC supply rail. Combined with 24-bit resolution and per-conversion offset/full-scale calibration, the result is a complete strain-gauge front end on a single chip, suitable for load monitoring and structural-health sensing.
Recomendado
Industrial Process Control Instrumentation
In 4-20 mA loop-powered or 24 V industrial instrumentation, the LTC2493IDE digitizes up to four single-ended process variables such as pressure, flow, and temperature on a single I2C bus, reducing BOM cost and PCB area. Its 2.7 V to 5.5 V supply range and industrial temperature grade make it compatible with 3.3 V microcontrollers and isolated 5 V analog rails. The integrated digital filter provides strong 50 Hz/60 Hz line-noise rejection at default output rates, eliminating the need for analog post-filtering in noisy factory environments.
Recomendado
Battery-Powered Portable Instrumentation
Handheld multimeters, dataloggers, and field-portable instrumentation benefit from the LTC2493IDE's low supply current and 2.7 V to 5.5 V operation, which allows direct connection to single-cell Li-Ion or two AA cells. Easy Drive technology draws negligible input current from high-impedance sensors, preserving battery life during long acquisitions. The I2C interface supports a 2-wire connection to a low-power MCU, simplifying the layout of battery-powered sensor pods.
Recomendado
Direct Sensor Digitization (RTD, Thermistor)
Resistance Temperature Detectors (RTDs) and thermistors change resistance with temperature and are typically digitized using a ratiometric measurement referenced to the ADC reference. The LTC2493IDE's wide common-mode input range accommodates the RTD/thermistor voltage divider biased anywhere from 0 V to VCC, while Easy Drive input current cancellation preserves the absolute accuracy of the ratiometric measurement. With a current excitation of 1 mA, the LTC2493IDE resolves 0.01 °C with a PT100 RTD across the industrial temperature range.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LTC2493IDE — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LTC2493CDE#PBF | LTC2493IDE#TRPBF | LTC2492IDE#PBF | LTC2493I#PBF |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 14-DFN (4x3 mm) | 14-DFN (4x3 mm) - same | 14-DFN (4x3 mm) - same | 14-DFN (4x3 mm) - same | 14-DFN (4x3 mm) - same |
| Resolution | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit |
| Channels (Single-Ended / Differential) | 4 SE / 2 DIFF | 4 SE / 2 DIFF | 4 SE / 2 DIFF | 2 SE / 2 DIFF (differential only) | 4 SE / 2 DIFF |
| Easy Drive Technology | Yes | Yes | Yes | No | Yes |
| Integrated Temperature Sensor | Yes (1/30 °C, 2 °C acc.) | Yes | Yes | Yes | Yes |
| Interface | I2C | I2C | I2C | I2C | I2C |
| Operating 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) |
Principais diferenciais
- 4 single-ended / 2 differential channels with Easy Drive input current cancellation (vs LTC2492IDE#PBF)
- Industrial temperature range (-40 to +85 °C) (vs LTC2493CDE#PBF)
- Integrated temperature sensor for cold-junction compensation (vs LTC2400)
Notas de projeto
Place a 0.1 µF ceramic bypass capacitor within 5 mm of the VCC pin (pin 14) and a 10 µF tantalum or ceramic bulk capacitor near the supply rail. The LTC2493 supply current is moderate but the internal digital filter draws current at the conversion rate; inadequate supply decoupling will couple into the reference and degrade 24-bit noise performance. A ferrite bead on VCC plus a star-ground topology minimizes ADC digital switching noise from contaminating the analog ground.
Route analog ground as a separate pour tied to GND at a single point near the ADC. Keep the I2C SDA/SCL traces short and away from the analog inputs; place a 100 kΩ pull-up resistor on each I2C line as specified by the datasheet. The CA0/CA1 chip-address pins should be tied LOW, HIGH, or left floating to set one of nine I2C addresses - do not place a capacitor on these pins.
Do not drive the analog inputs beyond the absolute maximum ratings (±25 mA beyond VCC or GND) or with source impedances above the datasheet's recommended maximum when Easy Drive is enabled - even though Easy Drive eliminates dynamic input currents, excessive DC input current will degrade linearity. Reference voltage must remain stable within 0.5 µV/°C for full 24-bit performance; bypass the REF+ pin with 0.1 µF ceramic in parallel with 10 µF tantalum. The first conversion after power-up may be inaccurate if the reference has not stabilized - discard the first reading.
Easy Drive technology eliminates dynamic input current, but the user must still ensure the input source impedance is below 1 kΩ for full DC accuracy and below 10 kΩ for full noise performance. For higher source impedances (e.g. >10 kΩ), add an external buffer such as the LTC2050 zero-drift op-amp between the sensor and the ADC inputs.
Informações de conformidade
RoHS/REACH compliance indicated by the #PBF suffix (Pb-free per Analog Devices ordering information). Halogen-free status not explicitly stated in retrieved data; assumed standard for current ADI products but marked 'unknown' for safety. Not AEC-Q100 qualified - the LTC2493IDE is for industrial, not automotive, applications.
