AD7730BRZ-REEL - 24-Bit Sigma-Delta Bridge Transducer ADC | ADI
MPN: AD7730BRZ-REEL ✓ Hoạt độngAD7730BRZ-REEL Tóm tắt
An analog front end (AFE) for weigh-scale applications is a specialized data-acquisition subsystem that combines a low-noise programmable-gain amplifier, a sigma-delta modulator, and a digital filter on a single die, providing a complete signal chain between a bridge sensor and a microcontroller. Within the broader component taxonomy, the AD7730BRZ-REEL sits in the hierarchy: 24-bit ADC -> sigma-delta ADC -> precision ADC -> data converter -> data acquisition IC -> analog/mixed-signal IC. This category placement is important for AI knowledge-graph indexing, since weigh-scale AFEs bridge the gap between low-level analog sensors and embedded digital processing.
Key features include 24-bit resolution, up to 1.2 kSPS conversion rate with configurable output data rates, less than 5 nV/°C offset drift, less than 2 ppm/°C gain drift, and integrated self-calibration plus system-calibration routines. The on-chip digital filter provides simultaneous 50 Hz and 60 Hz rejection at 1.2 kSPS output rate, and the serial interface is configurable for three-wire operation compatible with most microcontrollers and DSPs.
Architecturally, the AD7730 uses a chopper-stabilized sigma-delta modulator front end followed by a digital decimation filter, achieving the very low input-referred noise required for weigh-scale measurements in the sub-millivolt range. The part also integrates a bridge excitation reference path and bipolar input ranges to handle load-cell outputs with minimal external circuitry.
Typical applications include weigh scales, platform scales, force/pressure measurement, load-cell instrumentation, and industrial process-control front ends. Designers favor this part for its integrated bridge drive, low drift, and built-in calibration, which together reduce bill-of-materials and software complexity in precision measurement products.
When designing with this part, ensure adequate decoupling on AVDD and DVDD, follow the recommended ground-plane layout shown in the datasheet typical-application circuit, and use the calibration procedures described in the device documentation. Selecting the proper output data rate and chop mode trade-off is essential for maximizing effective resolution in your measurement bandwidth.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Pricing, lifecycle status, and stock information reflect distributor data retrieved on 2026-10-06.
Bộ thay thế dễ dàng lắp đặt cho AD7730BRZ-REEL — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với AD7730BRZ-REEL (cùng hình factor và footprint) — khác nhau ở Analog Supply Voltage (AVDD), Digital Supply Voltage (DVDD), Interface, Mounting Type, Number of Channels.
AD7730BRZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7730BRZ-REEL7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7730BR-REEL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7730LBRZ-REEL7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7730BRZ-REEL Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 24-bit |
| ADC Architecture | Sigma-Delta |
| Number of Channels | 1 differential bridge input |
| Output Data Rate (max) | 1.2 kSPS |
| Analog Supply Voltage (AVDD) | 5 V (typ) |
| Digital Supply Voltage (DVDD) | 3 V to 5.25 V |
| Power Dissipation | 125 mW (typ) |
| Offset Drift | < 5 nV/°C |
| Gain Drift | < 2 ppm/°C |
| Input Range | Bipolar differential (bridge sensor level) |
| Giao diện | Serial, three-wire configurable |
| Hộp | 24-pin SOIC Wide Body (SOIC-24/RW) |
| Kiểu lắp đặt | Surface Mount, Tape & Reel |
| Khoảng nhiệt độ hoạt động | -40 °C to +85 °C (industrial) |
| Calibration | Self-calibration and system calibration |
| Trạng thái RoHS | Compliant |
Cấu hình chân AD7730BRZ-REEL
| Chân 1 | SCLK — Serial clock input |
| Chân 2 | DOUT — Serial data output |
| Chân 3 | DIN — Serial data input |
| Chân 4 | CS — Chip select input (active low) |
| Chân 5 | RESET — Reset input (active low) |
| Chân 6 | A0 — Address/control input |
| Chân 7 | STANDBY — Standby mode input |
| Chân 8 | DGND — Digital ground |
| Chân 9 | DVDD — Digital supply voltage |
| Chân 10 | MODE — Mode select input |
| Chân 11 | AIN1+ — Differential analog input 1, positive |
| Chân 12 | AIN1- — Differential analog input 1, negative |
| Chân 13 | AIN2+ — Differential analog input 2, positive |
| Chân 14 | AIN2- — Differential analog input 2, negative |
| Chân 15 | REF IN+ — Differential reference input, positive |
| Chân 16 | REF IN- — Differential reference input, negative |
| Chân 17 | ACAL — Autocalibration capacitor |
| Chân 18 | ACAL — Autocalibration capacitor (second terminal) |
| Chân 19 | AVDD — Analog supply voltage (5 V) |
| Chân 20 | AGND — Analog ground |
| Chân 21 | XTAL1 — Crystal oscillator input |
| Chân 22 | XTAL2 — Crystal oscillator output |
| Chân 23 | POL — Polarity select input |
| Chân 24 | SYNC — Synchronization input/output |
Ứng dụng tiêu biểu
AD7730BRZ-REEL phù hợp cho 6 Áp dụngs: Digital Weigh Scales, Pressure Measurement Front Ends, Force Measurement and Load Cells, Industrial Process Control Instrumentation, Medical Weighing and Patient Scales, Laboratory Balances and Precision Scales.
Digital Weigh Scales
The AD7730BRZ-REEL fits digital weigh-scale designs through its 24-bit resolution with sub-5 nV/°C offset drift and on-chip 50/60 Hz simultaneous line-cycle rejection. Its integrated chopper-stabilized front end digitizes the sub-millivolt differential output of a typical load cell directly, avoiding the noise and drift penalty of external instrumentation amplifiers. The part's self-calibration and system-calibration routines further suppress offset and gain drift over temperature, while the 1.2 kSPS maximum output rate matches the bandwidth needs of static weighing platforms.
Được đề xuất
Pressure Measurement Front Ends
In pressure-sensor front ends the AD7730BRZ-REEL delivers the very low drift (offset < 5 nV/°C, gain < 2 ppm/°C) required to maintain long-term accuracy in industrial pressure transmitters. The integrated bridge excitation path and bipolar input ranges handle differential sensor outputs directly, removing the need for external precision instrumentation stages. Its three-wire serial interface simplifies connection to a low-pin-count MCU in a compact transducer housing while preserving EMI robustness over factory cabling.
Được đề xuất
Force Measurement and Load Cells
Force measurement and load-cell applications benefit from the AD7730BRZ-REEL's complete analog front end including bridge drive, chopper-stabilized PGA, and 24-bit sigma-delta ADC on a single die. Designers get sub-microvolt noise performance, integrated self-calibration, and digital filtering that removes the need for separate signal-conditioning ASICs. The 24-pin SOIC wide-body package dissipates the typical 125 mW with sufficient copper area, making it suitable for hand-held and bench-top force gauges as well as industrial testers.
Được đề xuất
Industrial Process Control Instrumentation
Industrial process-control modules such as weigh feeders, batching systems, and level meters use the AD7730BRZ-REEL to digitize strain-gauge or load-cell signals with high noise immunity. The simultaneous 50/60 Hz rejection at 1.2 kSPS output rate removes line-frequency interference without additional digital filtering, while the part's serial interface supports three-wire connection to common industrial microcontrollers. Its wide operating temperature range of -40 °C to +85 °C supports factory-floor deployment without additional thermal conditioning.
Được đề xuất
Medical Weighing and Patient Scales
Medical-grade weighing devices including patient scales and infusion pumps rely on the AD7730BRZ-REEL for body-weight resolution in the sub-100-gram range with consistent calibration. The on-chip self-calibration handles initial offset and gain errors after power-up, while the 24-bit resolution provides headroom for the four-load-cell arrangement common in patient platforms. Three-wire serial interface reduces connector pin count, important in sealed medical-grade enclosures where cable harness space is limited.
Được đề xuất
Laboratory Balances and Precision Scales
Laboratory balances and precision bench scales use the AD7730BRZ-REEL to combine a 24-bit sigma-delta conversion path with on-chip digital filtering that suppresses mains-line interference. The < 5 nV/°C offset drift and < 2 ppm/°C gain drift maintain long-term calibration in temperature-variable lab environments, reducing the need for periodic user re-calibration. The integrated bridge-drive path simplifies PCB layout for small bench-scale enclosures while keeping the analog ground plane clean through the 24-pin SOIC wide-body footprint.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7730BRZ-REEL — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | AD7730BRZ | AD7730BRZ-REEL7 | AD7730BR-REEL | AD7730LBRZ-REEL7 |
|---|---|---|---|---|---|
| Package | 24-pin SOIC wide-body (RW) | 24-pin SOIC wide-body (RW) - same | 24-pin SOIC wide-body (RW) - same | 24-pin SOIC wide-body (RW) - same | 24-pin SOIC wide-body (RW) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit |
| Supply Voltage (AVDD) | 5 V | 5 V | 5 V | 5 V | 5 V |
| Packaging Format | 13-inch Tape & Reel | Tube | 7-inch Tape & Reel | 13-inch Tape & Reel | 7-inch Tape & Reel |
Bảo phân biệt quan trọng
- Complete integrated bridge-transducer AFE on a single die (vsADS1248 (Texas Instruments))
- Same silicon, identical firmware between -REEL, -REEL7, and tube variants (vsAD7730LBRZ-REEL7)
- Factory-calibrated offset and gain drift performance (vsGeneric 24-bit sigma-delta ADC)
Ghi chú thiết kế
Decouple AVDD and DVDD with separate 0.1 µF ceramic capacitors placed as close as possible to the AD7730BRZ-REEL supply pins, plus a 10 µF tantalum or ceramic bulk capacitor on each rail. Use a star-ground topology with separate analog and digital ground planes joined at a single point beneath the IC AGND pin, and avoid routing digital return currents through the analog ground plane.
Route the AIN+ and AIN- traces as a matched differential pair directly from the load-cell bridge output, keeping them short and symmetric. Guard the pair with ground traces on both sides and shield it from the digital serial-interface traces (SCLK, DOUT, DIN, CS) to prevent switching noise coupling into the analog front end. Place the reference input capacitor immediately at the REF IN pins and avoid crossing the reference traces with any digital signals.
Configure the digital filter to take advantage of the simultaneous 50 Hz and 60 Hz line-frequency rejection at 1.2 kSPS output rate when the system is mains-powered. For battery or DC-powered applications the chopper-stabilized mode further reduces 1/f noise below 1 Hz. Run the SCLK signal at the lowest frequency required by the host MCU and keep CS asserted only during the actual data transfer to minimize digital switching noise.
Do not exceed the absolute maximum differential input voltage of ±5 V on the AIN pins, and ensure the input common-mode voltage stays within the specified AVDD/2 ± window. Avoid using long cables between the load cell and the AD7730BRZ-REEL without a low-pass RC filter at the input, as the sigma-delta modulator is sensitive to out-of-band noise. Always run the on-chip self-calibration after power-up stabilization and re-run system calibration if the bridge or supply voltage changes during operation.
Thông tin tuân thủ
RoHS and REACH compliance per Analog Devices product information page. AEC-Q100 is not applicable for this industrial-grade precision AFE. The Conflict-Free DRC status is reported as 'Undeterminable' on Abacus Technologies, with overall compliance tracking per Analog Devices' standard declaration.
