AD7327BRUZ - 500kSPS 8-Ch True Bipolar ADC | Analog Devices
MPN: AD7327BRUZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.65 | $76.50 |
| 100 | $6.55 | $655.00 |
| 500 | $5.85 | $2,925.00 |
| 1,000 | $5.57 | $5,570.00 |
Drop-in alternatives for AD7327BRUZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7327BRUZ-REEL7
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AD7327BRUZ-REEL
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AD7328BRUZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7321BRUZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7327TRUZ-EP
✅ Drop-In📋 Reference alternative (not in catalog)
AD7327BRUZ Maximum Ratings & Electrical Characteristics
| Resolution | 12-bit plus sign (13-bit) |
| Number of Channels | 8 (software-selectable) |
| Sampling Rate | 500 kSPS |
| Input Type | True bipolar, software-selectable ranges |
| Input Voltage Range | ±4×VREF, ±2×VREF, ±VREF, 0 to VREF |
| Reference Type | Internal 2.5 V or external up to 3 V |
| Interface | SPI (4-wire, daisy-chainable) |
| Architecture | SAR |
| Supply Voltage (Analog) | 5 V (VDD), ±12 V (VDD/VSS for ±12V input) |
| Supply Voltage (Digital) | 2.7 V to 5.25 V |
| Power Dissipation | 21 mW typical at 500 kSPS |
| SNR | 74 dB |
| THD | -86 dB |
| 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 | VIN0 — Analog input channel 0 |
| Pin 2 | VIN1 — Analog input channel 1 |
| Pin 3 | VIN2 — Analog input channel 2 |
| Pin 4 | VIN3 — Analog input channel 3 |
| Pin 5 | VIN4 — Analog input channel 4 |
| Pin 6 | VIN5 — Analog input channel 5 |
| Pin 7 | VIN6 — Analog input channel 6 |
| Pin 8 | VIN7 — Analog input channel 7 |
| Pin 9 | REF IN/OUT — Reference input/output |
| Pin 10 | AGND — Analog ground |
| Pin 11 | VDD — Positive analog supply (for bipolar input) |
| Pin 12 | VSS — Negative analog supply (for bipolar input) |
| Pin 13 | AVDD — Analog supply (5 V) |
| Pin 14 | DVDD — Digital supply (2.7 V to 5.25 V) |
| Pin 15 | DGND — Digital ground |
| Pin 16 | CS — Chip select (active low) |
| Pin 17 | SCLK — Serial clock input |
| Pin 18 | DIN — Serial data input |
| Pin 19 | DOUT — Serial data output |
| Pin 20 | VDRIVE — Logic supply for interface |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
AD7327BRUZ is suitable for 6 applications: Industrial Process Control, Data Acquisition Systems, Motor Control, Power Monitoring, Medical Instrumentation, Test and Measurement.
Industrial Process Control
The AD7327BRUZ is ideal for industrial process control systems that monitor and control analog signals from sensors such as pressure transmitters, flow meters, and temperature probes. Its 8-channel, software-selectable true bipolar input capability allows direct connection to bipolar sensor outputs without external signal conditioning. The 500 kSPS sampling rate enables real-time monitoring of multiple channels, while the 13-bit resolution (12-bit plus sign) provides the accuracy needed for precise control loops. The device operates over -40°C to +125°C, ensuring reliable performance in harsh industrial environments. The SPI interface simplifies integration with microcontrollers and PLCs, and the internal reference reduces external component count. Power dissipation of 21 mW at 500 kSPS is acceptable for most industrial systems. The AD7327BRUZ's true bipolar inputs support ±10 V signals with the internal 2.5 V reference, making it compatible with common industrial signal levels.
Recommended
Data Acquisition Systems
The AD7327BRUZ is well-suited for data acquisition systems (DAQ) that require high-speed, multi-channel analog-to-digital conversion. Its 8 channels and 500 kSPS throughput allow simultaneous sampling of multiple signals, making it ideal for vibration analysis, power quality monitoring, and laboratory instrumentation. The software-selectable input ranges (up to ±12 V with external 3 V reference) provide flexibility to interface with various sensor outputs without additional gain stages. The 13-bit resolution and 74 dB SNR ensure accurate digitization of small signals in the presence of noise. The SPI interface supports daisy-chaining, enabling expansion to more channels with minimal wiring. The device's low power consumption (21 mW) is beneficial for portable DAQ systems. The internal 2.5 V reference simplifies design, while the external reference option allows for ratiometric measurements. The AD7327BRUZ's true bipolar inputs eliminate the need for level shifting, reducing component count and board space.
Recommended
Motor Control
The AD7327BRUZ is used in motor control systems to digitize current and voltage feedback signals from motor phases. Its true bipolar input capability allows direct connection to current sense transformers and voltage dividers that produce bipolar signals. The 500 kSPS sampling rate enables high-bandwidth current loop control, while the 13-bit resolution provides fine granularity for precise torque and speed regulation. The device's 8 channels can monitor multiple phases and DC bus voltage simultaneously. The SPI interface allows fast data transfer to the motor control DSP or MCU. The AD7327BRUZ operates from a 5 V supply, which is common in motor control boards, and its low power dissipation (21 mW) minimizes thermal stress. The software-selectable input ranges allow optimization for different signal amplitudes, and the internal reference reduces external components. The -40°C to +125°C operating range ensures reliable operation in motor drive enclosures.
Recommended
Power Monitoring
The AD7327BRUZ is suitable for power monitoring applications, such as smart grid equipment, power quality analyzers, and energy meters. Its 8 channels can simultaneously sample voltage and current waveforms from multiple phases, enabling accurate calculation of power, harmonics, and power factor. The true bipolar input range of ±10 V (with internal 2.5 V reference) directly interfaces with voltage dividers and current transformers. The 500 kSPS sampling rate allows capturing harmonics up to the 50th order (for 50/60 Hz systems). The 13-bit resolution and 74 dB SNR ensure accurate measurement of small signals in the presence of large fundamental components. The SPI interface enables fast data streaming to a host processor. The device's low power consumption (21 mW) is advantageous for energy-efficient designs. The software-selectable input ranges provide flexibility for different voltage levels, and the internal reference simplifies calibration. The wide operating temperature range supports outdoor installation.
Recommended
Medical Instrumentation
The AD7327BRUZ is used in medical instrumentation, such as patient monitoring systems and diagnostic equipment, where accurate conversion of biosignals is critical. Its 8 channels can acquire multiple physiological signals (ECG, EEG, temperature) simultaneously. The true bipolar input capability allows direct connection to biopotential electrodes that produce bipolar signals. The 500 kSPS sampling rate is sufficient for most biosignal applications, and the 13-bit resolution provides the dynamic range needed for small signal detection. The device's low power consumption (21 mW) is essential for battery-powered portable devices. The SPI interface simplifies integration with medical-grade microcontrollers. The AD7327BRUZ operates over -40°C to +125°C, but medical applications typically use a narrower range; the device's performance is stable over 0°C to 70°C. The internal reference reduces external component count, and the software-selectable input ranges allow optimization for different signal amplitudes. The device is RoHS compliant, meeting medical regulatory requirements.
Recommended
Test and Measurement
The AD7327BRUZ is ideal for test and measurement equipment, such as oscilloscopes, data loggers, and spectrum analyzers, where high-speed, multi-channel data acquisition is required. Its 8 channels and 500 kSPS sampling rate allow simultaneous capture of multiple signals, enabling time-correlated measurements. The true bipolar input range of ±10 V (with internal 2.5 V reference) directly interfaces with common test signals. The 13-bit resolution and 74 dB SNR ensure accurate representation of waveforms. The SPI interface supports high-speed data transfer to FPGAs or DSPs for real-time processing. The device's low power dissipation (21 mW) is beneficial for benchtop instruments. The software-selectable input ranges provide flexibility for different signal levels, and the internal reference simplifies calibration. The AD7327BRUZ's small TSSOP-20 package saves board space in compact instruments. The wide operating temperature range ensures stable performance in various 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 | AD7321BRUZ | AD7327TRUZ-EP |
|---|---|---|---|---|---|
| Package | 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 |
| Number of Channels | 8 | 8 | 8 | 4 | 8 |
| Maximum Sampling Rate | 500 kSPS | 500 kSPS | 250 kSPS | 500 kSPS | 500 kSPS |
| Input Type | True bipolar, software-selectable | True bipolar, software-selectable | True bipolar, software-selectable | True bipolar, software-selectable | True bipolar, software-selectable |
| Reference | Internal 2.5 V or external up to 3 V | Internal 2.5 V or external up to 3 V | Internal 2.5 V or external up to 3 V | Internal 2.5 V or external up to 3 V | Internal 2.5 V or external up to 3 V |
| Interface | SPI | SPI | SPI | SPI | SPI |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -55°C to +150°C |
Key Differentiators
- True bipolar input capability with software-selectable ranges (vs AD7328BRUZ)
- Higher maximum sampling rate (vs AD7328BRUZ)
- Enhanced product (EP) version available (vs AD7327TRUZ-EP)
Design Notes
The AD7327BRUZ requires a 5 V analog supply (AVDD) and a 2.7 V to 5.25 V digital supply (DVDD). For true bipolar ±12 V input ranges, additional VDD and VSS supplies of ±12 V are needed. Ensure that AVDD and DVDD are properly decoupled with 0.1 µF and 10 µF capacitors placed close to the pins. The VDRIVE pin should be connected to the logic supply of the host interface to ensure correct logic levels.
For optimal performance, use a solid ground plane and separate analog and digital ground areas, connecting them at a single point. Place the ADC close to the signal source to minimize trace length and reduce noise pickup. Route analog input traces away from digital signals and use guard rings around the analog inputs if necessary. The REF IN/OUT pin should be bypassed with a 10 µF capacitor to ground to stabilize the internal reference.
A common pitfall is exceeding the absolute maximum input voltage on the analog input pins. The input voltage must not exceed the selected input range, as this can damage the device. Also, ensure that the reference voltage is stable and within the specified range (2.5 V internal or up to 3 V external). Incorrect SPI timing can cause data corruption; refer to the datasheet timing diagrams. Finally, do not leave unused analog inputs floating; tie them to AGND or to a known potential.
Compliance Information
RoHS3 compliant and REACH unaffected per PartGenie. DRC status: Conflict Free Undeterminable per Abacus Technologies.
