AD7327BRUZ - 500kSPS 8-Ch True Bipolar ADC | Analog Devices
MPN: AD7327BRUZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.57 | $5.57 |
| 10 | $5.12 | $51.20 |
| 100 | $4.68 | $468.00 |
| 500 | $4.23 | $2,115.00 |
| 1,000 | $3.79 | $3,790.00 |
AD7327BRUZ Overview
An ADC (analog-to-digital converter) is an electronic device that converts continuous analog signals into discrete digital values, enabling digital systems to process real-world signals. The AD7327BRUZ is a SAR-type ADC, which uses a successive approximation register algorithm to perform conversions with high speed and moderate resolution, making it suitable for applications requiring a balance between speed and accuracy. SAR ADCs are widely used in data acquisition systems, industrial control, and instrumentation, where they interface with sensors and transducers to digitize analog measurements.
Key features of the AD7327BRUZ include a software-selectable input range of ±4×VREF, ±2×VREF, ±VREF, and 0 to VREF, allowing flexibility in signal conditioning. It contains a 2.5 V internal reference, but also supports external reference operation; applying a 3 V reference enables true bipolar ±12 V analog input ranges. The device offers a high-speed serial interface (SPI-compatible) for communication with microcontrollers and DSPs, and includes a channel sequencer for automatic scanning of multiple channels. The ADC operates from a 5 V analog supply and a 2.7 V to 5.25 V digital supply, with a typical power dissipation of 21 mW at 500 kSPS.
The AD7327BRUZ features a 13-bit resolution (12-bit plus sign) and a maximum sampling rate of 500 kSPS, with a signal-to-noise ratio (SNR) of 74 dB and a total harmonic distortion (THD) of -86 dB, ensuring high accuracy for industrial measurements. The device includes an internal 2.5 V reference with a typical temperature drift of ±10 ppm/°C, and an external reference input that can be driven up to 3 V. The ADC provides a 4-wire serial interface (CS, SCLK, DIN, DOUT) and supports daisy-chaining for multiple devices. The operating temperature range is -40°C to +125°C, making it suitable for harsh environments.
Typical applications for the AD7327BRUZ include industrial process control, data acquisition systems, motor control, and power monitoring. Its true bipolar input capability and software-selectable ranges make it ideal for interfacing with sensors that produce bipolar signals, such as current transformers and thermocouples. The high throughput and 13-bit resolution enable precise measurement in real-time control loops.
When designing with the AD7327BRUZ, ensure that the analog input signals are within the selected input range to avoid damage. Use a low-impedance source and proper decoupling on the AVDD and DVDD pins. The reference input should be bypassed with a 10 µF capacitor for stable operation. The serial interface timing must comply with the datasheet specifications to ensure reliable data transfer.
Drop-in alternatives for AD7327BRUZ — 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 AD7327BRUZ (same form factor and footprint) — differing in Package, Analog Supply Voltage, Operating Temperature Range, Resolution, Input Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7327BRUZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7328BRUZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7327TRUZ-EP
✅ Drop-In📋 Reference alternative (not in catalog)
AD7321BRUZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7324BRUZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7327BRUZ-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7327BRUZ Maximum Ratings & Electrical Characteristics
| Resolution | 12-bit plus sign (13-bit) |
| Number of Channels | 8 |
| Sampling Rate | 500 kSPS |
| Input Type | True Bipolar, Software-Selectable |
| Input Ranges | ±4×VREF, ±2×VREF, ±VREF, 0 to VREF |
| Reference Type | Internal 2.5 V or External up to 3 V |
| SNR | 74 dB |
| THD | -86 dB |
| Power Dissipation | 21 mW at 500 kSPS |
| Analog Supply Voltage | 5 V |
| Digital Supply Voltage | 2.7 V to 5.25 V |
| Interface | SPI-compatible (4-wire) |
| Operating Temperature Range | -40°C to +125°C |
| Package | 20-lead TSSOP |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| MSL Level | 1 (Unlimited) |
AD7327BRUZ Pin Configuration
| Pin 1 | VDD — Positive analog supply |
| Pin 2 | VSS — Negative analog supply |
| Pin 3 | VIN0 — Analog input channel 0 |
| Pin 4 | VIN1 — Analog input channel 1 |
| Pin 5 | VIN2 — Analog input channel 2 |
| Pin 6 | VIN3 — Analog input channel 3 |
| Pin 7 | VIN4 — Analog input channel 4 |
| Pin 8 | VIN5 — Analog input channel 5 |
| Pin 9 | VIN6 — Analog input channel 6 |
| Pin 10 | VIN7 — Analog input channel 7 |
| Pin 11 | AGND — Analog ground |
| Pin 12 | REF IN/OUT — Reference input/output |
| Pin 13 | CS — Chip select |
| Pin 14 | SCLK — Serial clock |
| Pin 15 | DIN — Serial data input |
| Pin 16 | DOUT — Serial data output |
| Pin 17 | DVDD — Digital supply |
| Pin 18 | DGND — Digital ground |
| Pin 19 | VDRIVE — Logic supply |
| Pin 20 | VDD — Positive analog supply |
Typical Applications
AD7327BRUZ is suitable for 6 applications: Industrial Process Control, Data Acquisition Systems, Motor Control, Power Monitoring, Instrumentation, Medical Monitoring.
Industrial Process Control
The AD7327BRUZ is ideal for industrial process control due to its true bipolar input capability and software-selectable ranges. It can directly interface with sensors like current transformers and thermocouples that produce bipolar signals, enabling precise monitoring of process variables. The 500 kSPS sampling rate and 13-bit resolution ensure accurate real-time data acquisition for control loops, while the wide operating temperature range (-40°C to +125°C) suits harsh industrial environments. Its SPI interface simplifies connection to microcontrollers, and the channel sequencer allows automatic scanning of multiple channels, reducing software overhead.
Recommended
Data Acquisition Systems
The AD7327BRUZ is well-suited for data acquisition systems requiring high-speed, multi-channel analog-to-digital conversion. With 8 channels and a 500 kSPS throughput, it can digitize multiple signals simultaneously, making it ideal for logging and analysis. The software-selectable input ranges provide flexibility to accommodate various signal levels without external scaling. The device's low power dissipation (21 mW) is beneficial for portable or power-sensitive DAQ systems. Its SPI interface and daisy-chain capability enable easy integration with DSPs and microcontrollers, and the internal reference simplifies design, reducing external component count.
Recommended
Motor Control
The AD7327BRUZ is suitable for motor control applications where accurate current and voltage sensing is critical. Its true bipolar input capability allows direct measurement of phase currents and voltages, which can be bipolar in nature. The 500 kSPS sampling rate enables real-time monitoring of motor dynamics, and the 13-bit resolution provides sufficient precision for control algorithms. The device's robust operating temperature range and industrial-grade design ensure reliability in motor drive environments. The SPI interface allows fast data transfer to the controller, and the channel sequencer can be used to sample multiple motor phases in a round-robin fashion.
Recommended
Power Monitoring
The AD7327BRUZ is ideal for power monitoring applications, such as measuring voltage and current in power distribution systems. Its true bipolar inputs can handle AC signals directly, and the software-selectable ranges allow adaptation to different voltage levels. The 500 kSPS sampling rate enables accurate measurement of power quality parameters like harmonics and transients. The device's high SNR (74 dB) ensures precise energy metering, and the wide temperature range supports outdoor or industrial installations. The SPI interface facilitates integration with energy management processors, and the internal reference reduces BOM cost.
Recommended
Instrumentation
The AD7327BRUZ is well-suited for instrumentation applications, such as data loggers and test equipment, where accurate measurement of bipolar signals is required. Its 13-bit resolution and 74 dB SNR provide high accuracy, and the 500 kSPS sampling rate allows capturing fast transients. The software-selectable input ranges enable the device to handle a variety of signal levels without external attenuation. The device's low power consumption is advantageous for battery-powered instruments. The SPI interface and daisy-chain capability simplify system design, and the internal reference ensures stable operation over temperature.
Recommended
Medical Monitoring
The AD7327BRUZ can be used in medical monitoring equipment, such as patient monitors and diagnostic devices, where accurate acquisition of physiological signals is essential. Its true bipolar inputs can handle signals like ECG and EEG, which are bipolar in nature. The 500 kSPS sampling rate is sufficient for many biomedical signals, and the 13-bit resolution provides good dynamic range. The device's low power dissipation is beneficial for portable medical devices. The SPI interface allows easy integration with medical-grade microcontrollers, and the wide temperature range ensures reliable operation in clinical environments.
Recommended
Recommended Products Summary
Engineering reference data for AD7327BRUZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7327BRUZ-REEL7 | AD7328BRUZ | AD7327TRUZ-EP | AD7321BRUZ | AD7324BRUZ |
|---|---|---|---|---|---|---|
| Package | 20-lead TSSOP | 20-lead TSSOP | 20-lead TSSOP | 20-lead TSSOP | 20-lead TSSOP | 20-lead TSSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Channels | 8 | 8 | 8 | 8 | 4 | 4 |
| Sampling Rate | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS |
| Input Type | True Bipolar | True Bipolar | True Bipolar | True Bipolar | True Bipolar | True Bipolar |
| Resolution | 12-bit plus sign | 12-bit plus sign | 12-bit plus sign | 12-bit plus sign | 12-bit plus sign | 12-bit plus sign |
| Reference | Internal 2.5 V or External | Internal 2.5 V or External | Internal 2.5 V or External | Internal 2.5 V or External | Internal 2.5 V or External | Internal 2.5 V or External |
| Operating Temperature | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -55°C to +125°C | -40°C to +125°C | -40°C to +125°C |
Key Differentiators
- True bipolar input capability up to ±12 V (vs AD7321BRUZ)
- 500 kSPS sampling rate with 13-bit resolution (vs AD7324BRUZ)
- Enhanced product version available (vs AD7327TRUZ-EP)
Design Notes
The AD7327BRUZ requires a 5 V analog supply (VDD) and a negative supply (VSS) for true bipolar inputs. Ensure VSS is at least -12 V when using ±12 V input range. Decouple VDD and VSS with 10 µF and 0.1 µF capacitors close to the pins. The digital supply (DVDD) can range from 2.7 V to 5.25 V, and VDRIVE should match the host interface logic level.
Place the reference bypass capacitor (10 µF) as close as possible to the REF IN/OUT pin. Use a low-impedance ground plane for AGND and DGND, and connect them at a single point to avoid ground loops. Keep analog input traces short and shielded to minimize noise pickup. Follow the layout guidelines in the datasheet for optimal performance.
Ensure the analog input voltage does not exceed the selected input range to prevent damage. The serial interface timing must comply with the datasheet specifications; use the correct SCLK frequency and setup/hold times. Do not leave the CS pin floating; tie it high when not in use. Also, avoid driving the reference input with a voltage higher than 3 V, as this may damage the device.
Compliance Information
RoHS3 compliant and REACH compliant per distributor data. MSL 1 (Unlimited).
