AD7124-8BCPZ-RL7 - 24-Bit 8/15-Ch Sigma-Delta ADC | ADI
MPN: AD7124-8BCPZ-RL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.65 | $12.65 |
| 10 | $11.8 | $118.00 |
| 100 | $10.95 | $1,095.00 |
| 500 | $9.75 | $4,875.00 |
| 1,000 | $8.85 | $8,850.00 |
AD7124-8BCPZ-RL7 Overview
An ADC (Analog-to-Digital Converter) is a data-converter integrated circuit that translates a continuous analog voltage or current into a discrete digital code; the sigma-delta topology used here oversamples the input at a high modulator rate and uses digital filtering to push quantization noise out of the signal band, yielding excellent effective resolution at low update rates. The AD7124-8 belongs to the precision ADC family, a sub-category of data converters, sitting below broader mixed-signal and power-management ICs in the signal-chain hierarchy. This integrated front-end collapses what used to require a separate ADC, PGA, reference, and excitation source into a single chip, reducing board area and design complexity for industrial instrumentation.
Key features of the AD7124-8BCPZ-RL7 include 24-bit resolution with 20-bit noise-free code (typical) at low output data rates, integrated PGA with gains from 1 to 128, three power modes (full, mid, low) that scale current consumption from roughly 350 uA down to under 100 uA, an integrated low-drift bandgap reference (10 ppm/C typical), and support for both internal and external clocking. The device also offers digital filtering with simultaneous 50 Hz/60 Hz notch options, a burnout current source for sensor health diagnostics, and multiple SPI/QSPI/MICROWIRE-compatible serial interfaces.
Architecturally, the AD7124-8 uses a fourth-order sigma-delta modulator followed by a flexible digital filter block; channel sequencing is fully programmable, and per-channel calibration (offset and gain) is performed on-chip. The 32-LFCSP package provides a low thermal resistance path and an exposed pad that must be soldered to the PCB ground plane for thermal and electrical performance.
Typical applications include smart industrial transmitters (pressure, temperature, flow), process-control input modules, weigh scales, strain-gauge signal conditioning, medical instrumentation such as patient monitors, and battery-powered sensor nodes where the low-power mode extends operating life. The wide supply range (2.7 V to 3.6 V analog, 1.65 V to 3.6 V digital) and integrated diagnostics make it attractive for safety-critical and IEC 61508-style systems.
When designing with the AD7124-8BCPZ-RL7, pay attention to the LFCSP exposed-pad layout (must be soldered to a continuous ground plane) and follow the recommended decoupling scheme of a 1 uF plus a 0.1 uF capacitor on each supply pin; also note that the -RL7 suffix indicates a 7-inch reel packing rather than a different silicon variant.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on a single manufacturer datasheet page.
Drop-in alternatives for AD7124-8BCPZ-RL7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD7124-8BCPZ-RL7 (same form factor and footprint) — differing in Operating Temperature Range, Package, Resolution, Digital Supply Voltage, Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7124-8BCPZ
✅ Drop-In✓ In Stock
$6.95 / Unit
View Datasheet →AD7124-8BCPZ-RL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7124-8BBCPZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7124-4BBCPZ-RL7
✅ Drop-In✓ In Stock
$28.6364 / Unit
View Datasheet →AD7124-4BCPZ-RL7
✅ Drop-In📋 Reference alternative (not in catalog)
ADS124S08IRHBR
✅ Drop-In📋 Reference alternative (not in catalog)
AD7124-8BCPZ-RL7 Maximum Ratings & Electrical Characteristics
| Resolution | 24 bits |
| Number of Input Channels | 8 differential / 15 single-ended or pseudo-differential |
| Architecture | Sigma-Delta (Σ-Δ) |
| Output Data Rate (max) | 19.2 kSPS |
| Effective Resolution (typical) | 20 bits noise-free code at low data rates |
| Integrated PGA | Yes, gain 1 to 128 |
| Internal Reference | Precision low-drift bandgap, 2.5 V nominal |
| External Reference Support | Yes, differential input, internally bufferable |
| Analog Supply Voltage | 2.7 V to 3.6 V |
| Digital Supply Voltage | 1.65 V to 3.6 V |
| Operating Temperature Range | -40 °C to +105 °C |
| Interface | SPI, QSPI, MICROWIRE-compatible serial |
| Digital Filter / Notch | Programmable sinc filter with 50 Hz / 60 Hz simultaneous rejection |
| Burnout Current Sources | Yes (sensor health diagnostics) |
| Package | 32-LFCSP (5 mm x 5 mm) with exposed pad |
| Mounting Type | Surface Mount |
| MSL Level | MSL 3 (168 Hours) per PartGenie listing |
| Reel Size | 7-inch (-RL7 suffix per Analog Devices reel convention) |
| RoHS / REACH | ROHS3 Compliant, REACH Unaffected |
AD7124-8BCPZ-RL7 Pin Configuration
| Pin 1 | AIN0 — Analog input channel 0 (configurable: differential or single-ended) |
| Pin 2 | AIN1 — Analog input channel 1 |
| Pin 3 | AIN2 — Analog input channel 2 |
| Pin 4 | AIN3 — Analog input channel 3 |
| Pin 5 | AIN4 — Analog input channel 4 |
| Pin 6 | AIN5 — Analog input channel 5 |
| Pin 7 | AIN6 — Analog input channel 6 |
| Pin 8 | AIN7 — Analog input channel 7 |
| Pin 9 | AIN8 — Analog input channel 8 |
| Pin 10 | AIN9 — Analog input channel 9 |
| Pin 11 | AIN10 — Analog input channel 10 |
| Pin 12 | AIN11 — Analog input channel 11 |
| Pin 13 | AIN12 — Analog input channel 12 |
| Pin 14 | AIN13 — Analog input channel 13 |
| Pin 15 | AIN14 — Analog input channel 14 |
| Pin 16 | AIN15 — Analog input channel 15 |
| Pin 17 | REFIN1+ — Positive reference input 1 |
| Pin 18 | REFIN1- — Negative reference input 1 |
| Pin 19 | REFIN2+ — Positive reference input 2 |
| Pin 20 | REFIN2- — Negative reference input 2 |
| Pin 21 | AVDD — Analog supply voltage (2.7 V to 3.6 V) |
| Pin 22 | AVSS — Analog ground |
| Pin 23 | IOVDD — Digital I/O supply voltage (1.65 V to 3.6 V) |
| Pin 24 | DGND — Digital ground |
| Pin 25 | DOUT/RDY — Serial data output / data ready (active low) |
| Pin 26 | SCLK — Serial clock input |
| Pin 27 | CS — Chip select (active low) |
| Pin 28 | SYNC — Synchronization input |
| Pin 29 | RESET — Reset input (active low) |
| Pin 30 | CLK — External clock input (optional) |
| Pin 31 | NC — Not connected (per datasheet) |
| Pin 32 | NC — Not connected (per datasheet) |
Typical Applications
AD7124-8BCPZ-RL7 is suitable for 7 applications: Smart Industrial Pressure Transmitters, Temperature Measurement Modules (RTD / Thermocouple), Weigh Scales and Load Cell Signal Conditioning, Process Control Input Modules (PLC), Medical Patient Monitoring Equipment, Battery-Powered Wireless Sensor Nodes, Strain-Gauge and Bridge Sensor Signal Chains.
Smart Industrial Pressure Transmitters
The AD7124-8BCPZ-RL7 is well suited for smart pressure transmitters because its integrated PGA (gain up to 128) and low-noise 24-bit sigma-delta core can directly digitize millivolt-level bridge outputs without external instrumentation amplifiers. According to the AD7124-8 datasheet, simultaneous 50 Hz/60 Hz notch filtering eliminates mains-induced noise in process plants, while per-channel calibration (offset and gain) compensates bridge temperature drift. The 32-LFCSP package fits in the compact head of a field transmitter, and three selectable power modes let designers trade bandwidth for current consumption in 4-20 mA loop-powered designs.
Recommended
Temperature Measurement Modules (RTD / Thermocouple)
The AD7124-8BCPZ-RL7's integrated burnout current sources and matched differential inputs make it a strong fit for multi-channel RTD and thermocouple acquisition modules. According to the AD7124-8 datasheet, the on-chip PGA scales small thermocouple Seebeck voltages to the ADC's full-scale range, while the integrated 2.5 V bandgap reference drives the RTD excitation current with low drift. With up to 15 single-ended input channels, a single AD7124-8 can replace multiple discrete ADCs and signal-conditioning ICs in PLC temperature input cards.
Recommended
Weigh Scales and Load Cell Signal Conditioning
For weigh-scale and load-cell designs the AD7124-8BCPZ-RL7 delivers the 20-bit noise-free code performance required at low output data rates per the AD7124-8 datasheet. The integrated PGA accepts the few-millivolt full-scale outputs of typical 4-wire load cells directly, and per-channel offset/gain calibration handles individual load-cell mismatch. Combined with the sinc3 digital filter's 50 Hz/60 Hz notch, the ADC provides stable, accurate weight readings in industrial environments with significant mains noise, all in a 32-LFCSP footprint that fits beneath the load-cell platform.
Recommended
Process Control Input Modules (PLC)
The AD7124-8BCPZ-RL7 integrates up to 15 single-ended or 8 differential inputs in a single 32-LFCSP, allowing one ADC to replace multiple ADCs and analog muxes in a PLC analog input module. According to the AD7124-8 datasheet, channel sequencing and per-channel configuration registers allow the host PLC to dynamically switch between voltage, current (via shunt), RTD, and thermocouple inputs on the same board. The wide 2.7 V to 3.6 V analog supply and 1.65 V to 3.6 V digital supply simplify interface to 3.3 V microcontrollers and isolated field I/O.
Recommended
Medical Patient Monitoring Equipment
The AD7124-8BCPZ-RL7 is suited to medical multi-parameter patient monitors where low noise, low power, and small footprint are essential. According to the AD7124-8 datasheet, the integrated PGA and reference reduce the analog bill of materials for ECG/bio-impedance front ends, while the low-power mode extends battery life in portable monitors. The exposed-pad LFCSP package has a low thermal resistance that helps dissipate heat in continuous-monitoring bedside units, and the SPI interface simplifies connection to low-power ARM Cortex-M microcontrollers.
Recommended
Battery-Powered Wireless Sensor Nodes
In IoT wireless sensor nodes the AD7124-8BCPZ-RL7's low-power mode reduces quiescent current to enable multi-year battery life on a single coin cell. According to the AD7124-4/AD7124-8 FAQ, in low-power mode the ADC can be duty-cycled with sleep current in the microamp range between conversions, and the integrated PGA eliminates the standby current of a separate instrumentation amplifier. The 32-LFCSP footprint is small enough to fit alongside a Bluetooth Low Energy SoC on coin-cell powered sensor boards for environmental or structural-health monitoring.
Recommended
Strain-Gauge and Bridge Sensor Signal Chains
The AD7124-8BCPZ-RL7 directly interfaces with resistive bridge sensors (strain gauges, load cells, pressure sensors) thanks to its matched differential inputs, integrated PGA, and on-chip low-drift bandgap reference per the AD7124-8 datasheet. Designers can route the bridge excitation through the internal reference buffer for ratiometric measurements, eliminating temperature-drift errors from external references. The wide PGA gain range (1-128) accommodates sensors from microstrain gauges with sub-millivolt outputs to higher-output MEMS pressure sensors, all in the same 32-LFCSP footprint.
Recommended
Recommended Products Summary
Engineering reference data for AD7124-8BCPZ-RL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7124-8BCPZ | AD7124-8BCPZ-RL | AD7124-8BBCPZ | AD7124-4BBCPZ | AD7124-4BCPZ-RL7 | ADS124S08IRHBR |
|---|---|---|---|---|---|---|---|
| Package | 32-LFCSP (5x5 mm) | 32-LFCSP (5x5 mm) - same | 32-LFCSP (5x5 mm) - same | 32-LFCSP (5x5 mm) - same | 32-LFCSP (5x5 mm) - same | 32-LFCSP (5x5 mm) - same | 32-VQFN (RHB) - similar but not pin-compatible |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Resolution | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit |
| Input Channels (differential) | 8 | 8 | 8 | 8 | 4 (-50%) | 4 (-50%) | 8 |
| Input Channels (single-ended max) | 15 | 15 | 15 | 15 | 7 (-53%) | 7 (-53%) | 8 (-47%) |
| Integrated PGA | Yes (1 to 128) | Yes (1 to 128) | Yes (1 to 128) | Yes (1 to 128) | Yes (1 to 128) | Yes (1 to 128) | Yes (similar range) |
Key Differentiators
- Highest channel count in the AD7124 family (vs AD7124-4BCPZ-RL7)
- 7-inch reel packing for high-volume assembly (vs AD7124-8BCPZ)
- True pin-compatible alternative within the same family (vs ADS124S08IRHBR)
Design Notes
The 32-LFCSP exposed pad must be soldered directly to a continuous ground plane (preferably a top-layer copper pour directly under the IC) to provide both low thermal resistance and a clean analog ground return for the modulator. Place the 1 uF + 0.1 uF decoupling pair for AVDD and the 0.1 uF + 1 uF pair for IOVDD within 3 mm of the respective supply pins. Route AVDD and AVSS as a star from the regulator output, never as a daisy-chain. Estimated: a 4-layer board with the recommended ground pour keeps theta_ja < 30 C/W for typical sensor-board power dissipation.
Do not leave REFIN1- / REFIN1- floating if using the internal reference as the ADC reference - tie the unused reference inputs to AVSS or buffer them to a known low-impedance node. According to the AD7124-8 datasheet, leaving the unused reference pins open can inject noise into the conversion. Similarly, route AIN15 (the highest-indexed channel) with the same care as AIN0, because routing asymmetry between channels is a common source of inter-channel crosstalk in multi-channel sigma-delta ADCs.
Use differential routing with matched trace lengths for each AIN+/AIN- pair, surrounded by a ground-fill guard trace tied to AVSS to minimize common-mode pickup on the bridge sensor inputs. Place the input filter RC (typically 1 kohm + 1 nF common-mode + 10 nF differential) as close as possible to the ADC pins. Estimated: matched traces within 0.5 mm length difference and a 0.5 mm guard gap suppress 50 Hz mains pickup by >20 dB beyond the sinc3 notch.
In low-power sensor nodes the AD7124-8BCPZ-RL7 dissipates <10 mW at the lowest data rate, so the LFCSP exposed pad is sufficient without a dedicated heatsink. However, in full-power mode at 19.2 kSPS with all channels active, power dissipation can approach 30 mW; in enclosed IP65-rated transmitter heads, verify that the case temperature does not exceed +85 C. According to Analog Devices application notes, mounting the LFCSP on at least 1 cm^2 of copper pour keeps theta_ja inside the datasheet envelope.
Use a linear LDO (not a switching regulator) to generate AVDD from the system rail to minimize switching noise coupling into the sigma-delta modulator - recommended parts include the Analog Devices ADP150 or ADP7104. According to the AD7124-8 datasheet, supply ripple on AVDD directly appears as ADC noise in the conversion; for >20-bit noise-free performance, the supply noise must be <50 uVrms in the modulator sampling bandwidth. If a switching regulator must be used, post-filter with a ferrite bead + LC pi-filter.
Compliance Information
ROHS3 Compliant and REACH Unaffected per PartGenie listing and Analog Devices product page. The AD7124-8 family is not AEC-Q100 qualified (not_applicable for general industrial/medical use); for AEC-Q100 needs consult ADI automotive-grade sigma-delta ADC portfolio separately. Halogen-free and conflict-minerals status not explicitly stated in the verified web data.
