AD7858LBR-REEL - 12-bit 100kSPS 8-Ch ADC SOIC-24 | Analog Devices
N.º de pieza: AD7858LBR-REEL ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.2 | $162,00 |
| 100 | $13.85 | $1.385,00 |
| 500 | $11.4 | $5.700,00 |
| 1.000 | $9.95 | $9.950,00 |
AD7858LBR-REEL Descripción general
A SAR ADC is a successive-approximation-register analog-to-digital converter: a binary-search loop that compares the sampled input against a precision DAC in N clock cycles (N = resolution in bits) to produce a fully settled conversion in a single acquisition window. ADCs sit hierarchically inside the data-converter family (ADC/DAC), which in turn are a sub-category of mixed-signal and interface ICs in the broader integrated-circuits ecosystem.
Key features of the AD7858L include 12 mW typical power consumption from a 3 V supply, automatic power-down to 25 µW between conversions, on-chip system and self-calibration that runs automatically on power-up, and a flexible serial interface compatible with most DSPs and microcontrollers. Operating temperature range is -40 °C to +85 °C (industrial grade), and the part is specified for VDD of 2.7 V to 5.5 V.
The converter architecture is a charge-redistribution SAR with input span 0 V to VREF (with VREF typically tied to VDD). Eight single-ended channels are routed through an analog multiplexer; the user can configure the part for four pseudo-differential pairs by software. The wide SOIC-24 footprint simplifies hand prototyping and inspection compared to the SSOP variant.
Typical applications include multi-channel data-acquisition front ends, industrial process-control loops, portable battery-powered instrumentation, and automotive sensor monitoring. The integrated multiplexer makes it a single-chip replacement for systems that previously needed an external analog switch.
When designing with this part, place a 0.1 µF decoupling capacitor within 5 mm of the VDD pin and keep analog/digital ground returns separated to a single star point under the IC. Because this part is now obsolete, confirm last-time-buy stock and consider AD7858LBRZ-REEL or a modern alternative such as AD7606 for new designs.
Alternativas directas para AD7858LBR-REEL — 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:
AD7858LBRZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD7858LBRZ-REEL
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD7858LBR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD7858LARZ-REEL
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD7858ARZ-REEL
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD7858BRZ-REEL
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD7858LBR-REEL Valores máximos y características eléctricas
| Resolución | 12 bits |
| Sample Rate (AD7858L) | 100 kSPS |
| Sample Rate (AD7858 standard) | 200 kSPS |
| Number of Input Channels | 8 single-ended or 4 pseudo-differential |
| Architecture | SAR (Successive Approximation Register) |
| Supply Voltage (VDD) | 2.7 V to 5.5 V (single 3 V or 5 V supply) |
| Analog Input Voltage Range | 0 V to VREF (VREF typically tied to VDD, 0 V to 5.5 V) |
| Power Consumption (active, VDD=3V) | 12 mW typical |
| Power Consumption (power-down) | 25 µW typical (auto power-down between conversions) |
| Rango de temperatura de funcionamiento | -40 °C to +85 °C (industrial) |
| Calibration | On-chip system and self-calibration, automatic on power-up |
| Data Interface | Serial (DSP/microcontroller compatible) |
| Encapsulado | SOIC-24 (wide body, 300 mil) |
| Tipo de montaje | Surface Mount |
| Screening Level | Industrial |
| Reel Quantity (REEL) | 2500 pieces per 13-inch reel |
Configuración de pines de AD7858LBR-REEL
| Pin 1 | AIN1 — Analog input channel 1 |
| Pin 2 | AIN2 — Analog input channel 2 |
| Pin 3 | AIN3 — Analog input channel 3 |
| Pin 4 | AIN4 — Analog input channel 4 |
| Pin 5 | AIN5 — Analog input channel 5 |
| Pin 6 | AIN6 — Analog input channel 6 |
| Pin 7 | AIN7 — Analog input channel 7 |
| Pin 8 | AIN8 — Analog input channel 8 |
| Pin 9 | REF — Voltage reference input (typically tied to VDD) |
| Pin 10 | AGND — Analog ground |
| Pin 11 | CAL — Calibration control input |
| Pin 12 | CONVST — Conversion start input |
| Pin 13 | CS — Chip select (active low) |
| Pin 14 | SCLK — Serial clock input |
| Pin 15 | DOUT — Serial data output |
| Pin 16 | DIN — Serial data input |
| Pin 17 | BUSY — ADC busy indicator output |
| Pin 18 | RESET — Reset input |
| Pin 19 | PD — Power-down control input |
| Pin 20 | MODE — Serial interface mode select |
| Pin 21 | NC — Not connected (per datasheet) |
| Pin 22 | DGND — Digital ground |
| Pin 23 | AGND — Analog ground (secondary bond) |
| Pin 24 | VDD — Positive supply voltage (2.7 V to 5.5 V) |
Aplicaciones típicas
AD7858LBR-REEL es adecuado para 6 aplicacións: Multi-Channel Industrial Data Acquisition Front-End, Battery-Powered Portable Instrumentation, Automotive Sensor Monitoring, Process Control Loop Digitization, Medical Patient Monitoring Peripherals, Power-Monitor / Energy Metering.
Multi-Channel Industrial Data Acquisition Front-End
The AD7858LBR-REEL is purpose-built for multi-channel industrial data-acquisition front-ends where 8 single-ended sensor signals (thermistors, strain gauges, 4-20 mA loop shunts) must be digitized around a single MCU. Its 12-bit resolution at 100 kSPS aggregate throughput gives 12.5 kSPS per channel when time-multiplexed across all 8 inputs - sufficient for process-control loop rates under 1 kHz. The 0-5.5 V input span matches industrial sensor output ranges directly. Single 3 V or 5 V supply simplifies power tree design. As of 2026-10-12, the part is obsolete, so plan migration to AD7858LBRZ or AD7606 for new designs.
Recomendado
Battery-Powered Portable Instrumentation
With 12 mW active power at 3 V supply and automatic power-down to 25 µW between conversions, the AD7858LBR-REEL fits battery-powered handheld multimeters, portable medical monitors, and field data loggers. The 100 kSPS sample rate is more than adequate for slow analog sensor channels (temperature, pressure, battery voltage), and the 8-channel mux eliminates an external analog switch. Operating from a single 2.7 V to 5.5 V supply allows direct connection to Li-ion or 2x AA cells. Plan a migration to AD7495ARM for new ultra-low-power designs.
Recomendado
Automotive Sensor Monitoring
Within its -40 °C to +85 °C industrial temperature window, the AD7858LBR-REEL was widely used in non-safety automotive subsystems: body-control modules reading multiple thermistors, occupancy sensors, and battery management analog inputs. The 8-channel mux with single 5 V supply maps directly to automotive 12 V battery rails regulated down by a simple LDO. Note that the part is NOT AEC-Q100 qualified - for new automotive safety designs, evaluate AEC-Q100-qualified ADCs. Obsolete status as of 2026-10-12 means last-time-buy only.
Recomendado
Process Control Loop Digitization
PLC analog input modules and DCS remote I/O use the AD7858LBR-REEL to convert 4-20 mA current-loop shunts into 12-bit digital values for the controller. The 8 single-ended channels per IC let a single converter service 8 analog inputs, lowering BOM cost per channel. The serial interface simplifies isolation: the ADC sits on the field side of an optocoupler or digital isolator, with only SCLK, DOUT, and CONVST crossing the barrier. For new process-control designs, the AD7858LBRZ-REEL remains the closest active alternative.
Recomendado
Medical Patient Monitoring Peripherals
Non-critical medical peripherals (blood-pressure cuffs, pulse-oximeter front-ends, bedside temperature monitors) used the AD7858LBR-REEL to digitize multiple bioelectric signals. Its 12-bit resolution is adequate for vitals monitoring where EN60601 12-bit dynamic range is the typical floor; the low power consumption preserves battery life in portable devices. Note the part is not medical-grade qualified and the manufacturer has obsoleted it as of 2026-10-12. For new medical designs, plan to use AD7858LBRZ (last-time-buy) or a modern 16-bit ADC like AD7195.
Recomendado
Power-Monitor / Energy Metering
Single-phase energy meters and DC power monitors use the AD7858LBR-REEL to sample voltage and current shunt signals simultaneously for real-power calculation. Although the 100 kSPS aggregate throughput is modest, it is sufficient for 50/60 Hz mains metering and DC bus monitoring where harmonic content above the 31st is negligible. The 8 input channels accommodate multi-phase monitoring (3 voltage + 3 current + 1 auxiliary) within a single IC. For new smart-meter designs, the AD7606 or ADE7953 are modern functional equivalents.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para AD7858LBR-REEL — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | AD7858LBRZ | AD7858LBRZ-REEL | AD7858LBR | AD7858LARZ-REEL | AD7858ARZ-REEL | AD7858BRZ-REEL |
|---|---|---|---|---|---|---|---|
| Package | SOIC-24 (wide body) | SOIC-24 (wide body) - same | SOIC-24 (wide body) - same | SOIC-24 (wide body) - same | SOIC-24 (wide body) - same | SOIC-24 (wide body) - same | SOIC-24 (wide body) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sample Rate | 100 kSPS (L grade) | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 200 kSPS (standard grade) | 200 kSPS (standard grade) |
| Channels | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff |
| 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 | 2.7 V to 5.5 V |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| RoHS Status | Non-RoHS (-REEL suffix) | RoHS compliant | RoHS compliant | Non-RoHS (tube) | RoHS compliant | RoHS compliant | RoHS compliant |
| Lifecycle Status (2026-10-12) | Obsolete | Active | Active | Obsolete | Active | Active | Active |
Diferenciadores clave
- True pin-to-pin drop-in with active lifecycle status (frente a AD7858LBRZ-REEL)
- Industrial temperature grade vs non-RoHS original (frente a AD7858LBRZ-REEL)
- Higher sample rate option in the same SOIC-24 footprint (frente a AD7858ARZ-REEL / AD7858BRZ-REEL)
Notas de diseño
Place a 0.1 µF ceramic decoupling capacitor within 5 mm of the VDD pin (pin 24) and a 10 µF bulk tantalum or ceramic capacitor on the supply rail. The AD7858LBR-REEL shares analog and digital ground return pins (AGND on pins 10 and 23, DGND on pin 22); tie all three to a single low-impedance ground plane with a star-point connection under the IC to avoid digital switching noise coupling into the analog input. The auto power-down feature reduces idle current to 25 µW but requires a CONVST rising edge to wake the part - ensure the host MCU does not leave CONVST high between conversions or power-down will be inhibited.
Do not leave any analog input floating - unused AIN pins (pins 1-8) must be tied to AGND or a known DC voltage to prevent crosstalk and erratic calibration readings. The on-chip system and self-calibration runs once on power-up; it cannot be retriggered by the user, so the supply must settle to within 1% before the calibration cycle completes. When using pseudo-differential mode, the negative input must settle to within 100 mV of AGND by end of acquisition, or INL degrades by typically 1 LSB.
Route the serial-interface traces (SCLK, DOUT, DIN, CONVST, BUSY, CS) over a continuous ground plane and keep them shorter than 50 mm if running above 10 MHz SCLK. Place a 100 Ω series resistor at the SCLK source to dampen reflections when driving the MCU side. Because the part is obsolete as of 2026-10-12, do not design the serial bus around AD7858-specific timing margins; select the MCU and pinout so the AD7858LBRZ-REEL or AD7606 drop-in can be substituted without firmware rewrite where possible.
Información de cumplimiento
Non-RoHS terminal finish on AD7858LBR-REEL (the -REEL suffix indicates tape-and-reel carrier, not RoHS). RoHS-compliant active alternative is AD7858LBRZ or AD7858LBRZ-REEL. Industrial -40 °C to +85 °C screening grade; not AEC-Q100 qualified for automotive safety. Conflict-minerals compliance per Analog Devices standard supplier declarations.
