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Analog Devices Inc. AD7328BRUZ-REEL
- Part No.:
- AD7328BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7328BRUZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,277
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Product details
Overview
AD7328BRUZ-REEL from Analog Devices is a 12-bit plus sign (13-bit effective) successive approximation ADC with true bipolar input capability, 8-channel software-selectable analog inputs, and 1 MSPS throughput. It supports ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V input ranges per channel, features an internal 2.5 V reference, and operates on iCMOS process for high-voltage tolerance and low power (21 mW at 1 MSPS). It is used in industrial data acquisition systems requiring high-accuracy, multi-range, multi-channel analog monitoring.
For engineers reviewing the AD7328BRUZ-REEL datasheet, AD7328BRUZ-REEL pinout, AD7328BRUZ-REEL application, or AD7328BRUZ-REEL equivalent, key selection considerations include true differential/single-ended/pseudo-differential input configuration flexibility, channel sequencer support, SPI/QSPI/MICROWIRE-compatible serial interface timing, and ±12 V supply requirement for ±12 V input operation.
Technical Context
The AD7328BRUZ-REEL integrates a 13-bit SAR core with track-and-hold, programmable channel sequencer, and independent range registers enabling per-channel input range selection across four modes. Its iCMOS process enables ±16.5 V analog supply rails while maintaining sub-1 µA shutdown current and 50 ps aperture jitter.
It implements a 3-wire SPI-compatible serial interface with 16-clock conversion readout, supports straight binary or two's complement output coding via control register, and includes on-chip temperature indicator and VDRIVE logic-level decoupling for mixed-voltage system interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit plus sign (13-bit effective); guarantees no missing codes in differential mode |
| Throughput Rate | 1 MSPS maximum; requires 20 MHz SCLK and VCC ≥ 4.75 V |
| Analog Input Ranges | Software-selectable per channel: ±10 V, ±5 V, ±2.5 V, or 0 V to +10 V |
| Reference | Internal 2.5 V ±10 mV (TMIN–TMAX); supports external reference up to 3.0 V |
| Power Dissipation | 21 mW at ±12 V supplies, 5 V VCC, 1 MSPS; drops to 38.25 µW in full shutdown |
| Full Power Bandwidth | 22 MHz at 3 dB; enables accurate digitization of fast transients |
| Channel Count & Type | 8 analog inputs configurable as single-ended, true differential (4 pairs), or pseudo-differential (4 or 7) |
Pinout & Package
AD7328BRUZ-REEL is housed in a 20-lead TSSOP package (4.4 mm × 6.5 mm, 0.65 mm pitch) with exposed pad for thermal management. Pin functions are validated per Analog Devices Rev. C datasheet Figure 3 and Table 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low frame signal initiating conversion and serial data transfer; must meet t1 ≥ 5 ns pulse width (VCC = 4.75–5.25 V) |
| DIN / DOUT / SCLK | Serial Interface | 3-wire SPI-compatible bus; 16-bit readout (3 addr + 1 sign + 12 data bits), MSB-first, falling-edge clocked |
| VIN0–VIN7 | Analog Inputs | Eight multiplexed inputs; each independently configurable for range, polarity, and input type (SE/diff/pseudo-diff) |
| REFIN/OUT | Reference I/O | 2.5 V internal reference output or external reference input; requires 680 nF decoupling capacitor |
| VDD / VSS | Analog Supplies | ±12 V to ±16.5 V rails required for ±10 V input range; ±12 V minimum for ±12 V operation with external 3 V ref |
| VCC / VDRIVE / AGND / DGND | Core & Logic Supplies | VCC powers ADC core (2.7–5.25 V); VDRIVE sets logic levels (2.7–5.25 V); AGND/DGND must be within 0.3 V potential difference |
Key Features
| Feature | Design Value |
|---|---|
| True bipolar input architecture | Accepts ±10 V, ±5 V, ±2.5 V signals without external level-shifting or op-amp circuitry |
| Per-channel software-selectable range | Each VINx independently programmed via range registers-enables mixed-range acquisition in one scan |
| Channel sequencer with auto-increment | Reduces host processor overhead by automatically cycling through selected channels without repeated register writes |
| iCMOS process technology | Enables 33 V total analog supply range (VDD–VSS) in compact TSSOP, with <50 ps aperture jitter |
| Temperature indicator | On-chip sensor provides calibrated digital output for system thermal monitoring without external components |
| Multiple power-down modes | Autostandby (1.3 mA), autoshutdown (1 µA), full shutdown (1 µA); supports dynamic power scaling per throughput demand |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous voltage/current sensing across multiple sensors in PLC I/O modules with varying signal ranges (e.g., ±10 V thermocouple amps, 0–10 V pressure transducers). IC Role / Device Role / Timing Role: Central 8-channel ADC performing synchronized, range-mixed sampling at up to 1 MSPS with integrated sequencer and SPI interface to FPGA controller. Use Value: Eliminates external range-switching multiplexers and level-shifters; reduces BOM count and layout area while supporting real-time multi-signal analysis. |
Use Scenario: High-fidelity waveform capture in portable oscilloscopes and automated test equipment where input signal polarity and amplitude vary between measurements. IC Role / Device Role / Timing Role: Front-end digitizer providing true differential acquisition, 22 MHz full-power bandwidth, and low THD (−82 dB) for clean spectral analysis. Use Value: Enables single-device support for both unipolar and bipolar probes without hardware reconfiguration-reducing calibration complexity and test setup time. |
| Energy Metering Systems | Motor Control Feedback |
Use Scenario: Simultaneous sampling of phase voltages and currents in polyphase energy meters under noisy grid conditions with common-mode ripple up to 1 MHz. IC Role / Device Role / Timing Role: Precision ADC delivering −79 dB CMRR up to 100 kHz and −72 dB channel-to-channel isolation for accurate RMS and harmonic computation. Use Value: Maintains measurement integrity despite high dv/dt noise; eliminates need for external guard traces or separate isolated ADCs per phase. |
Use Scenario: Real-time current and bus voltage sensing in servo drives, where motor phase currents require true differential measurement and DC link voltage demands high common-mode rejection. IC Role / Device Role / Timing Role: Dual-role ADC acquiring both high-bandwidth current feedback (±5 V, differential) and slower DC link monitoring (0–10 V, single-ended) in same sequence. Use Value: Enables compact, cost-optimized drive design with unified analog front-end-no separate ADCs or signal conditioning for different measurement types. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-channel, software-configurable ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7329 | Same 12-bit+sign resolution and 8-channel architecture but rated for 1000 kSPS (vs. 1 MSPS); identical pinout and register map | Lower max throughput limits use in high-speed transient capture; otherwise drop-in compatible for lower-rate systems | Select AD7329 when 1 MSPS is not required and lower power at reduced throughput is prioritized |
| AD7327 | 500 kSPS max throughput; shares same input range flexibility, sequencer, and iCMOS process but lacks temperature indicator | Not suitable for thermal-aware designs; lower speed restricts use in fast-loop control or burst-mode acquisition | Choose AD7327 only for cost-sensitive, lower-throughput industrial monitoring where temperature sensing is unnecessary |
Compared with AD7328BRUZ-REEL, AD7329 offers identical functionality at slightly lower speed and power, while AD7327 sacrifices throughput and thermal monitoring-making AD7328BRUZ-REEL the optimal choice for 1 MSPS, temperature-aware, mixed-range industrial data acquisition.
Availability
AD7328BRUZ-REEL is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, energy metering systems, motor control feedback, and embedded data loggers requiring stable component supply and long-term manufacturability.
Supply support for AD7328BRUZ-REEL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7328BRUZ-REEL belongs to Analog Devices' precision data acquisition IC product line, designed specifically for industrial-grade multichannel systems demanding true bipolar input handling, software-configurable ranges, and robust noise immunity in harsh electrical environments.
FAQ
What input voltage ranges does the AD7328BRUZ-REEL support, and how are they selected?
The AD7328BRUZ-REEL supports four software-selectable input ranges per channel: ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V. Each range is configured independently via dedicated range registers in the device's control memory map. Selection requires writing to the appropriate range register before conversion, and the setting persists until rewritten. The ±10 V range requires minimum ±10 V analog supplies (VDD/VSS), while the 0 V to +10 V range allows VSS to connect to AGND.
Does the AD7328BRUZ-REEL require external components for stable operation?
Yes-the AD7328BRUZ-REEL requires a 680 nF capacitor on the REFIN/OUT pin for internal reference stability, 0.1 µF ceramic decoupling capacitors on VCC and VDRIVE referenced to their respective grounds (AGND and DGND), and proper separation of analog/digital ground planes with a single-point connection. External Schottky diodes are recommended on VDD/VSS if driven from alternative supply circuitry to prevent latch-up.
Can the AD7328BRUZ-REEL operate with a 3.3 V logic interface while using ±15 V analog supplies?
Yes-the AD7328BRUZ-REEL supports independent logic and analog supplies. Set VDRIVE = 3.3 V for 3.3 V logic compatibility while maintaining VDD = +15 V and VSS = −15 V for ±10 V input range operation. VCC must be 2.7–5.25 V (e.g., 3.3 V or 5 V) to power the ADC core. Ensure VDRIVE does not exceed VCC by more than 0.3 V per datasheet specifications.
How does the channel sequencer function in the AD7328BRUZ-REEL?
The AD7328BRUZ-REEL's channel sequencer automatically cycles through a user-defined subset of VIN0–VIN7 in ascending order upon consecutive CS assertions. It is enabled via the SEQ bit in the control register and configured using the sequence register to specify start channel and number of channels. This eliminates host CPU intervention between conversions, enabling efficient burst-mode acquisition with minimal firmware overhead.
What is the significance of "12-bit plus sign" resolution in the AD7328BRUZ-REEL?
"12-bit plus sign" means the AD7328BRUZ-REEL outputs 13 bits total: 1 sign bit + 12 magnitude bits. In differential mode, this yields 13-bit effective resolution (FSR/8192); in single-ended or pseudo-differential mode, it delivers 12-bit resolution (FSR/4096) with sign extension. This architecture preserves full-scale accuracy across bipolar and unipolar ranges without sacrificing code density or requiring post-processing sign handling.
AD7328BRUZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iCMOS®
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 4, 7, 8
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- ±12V ~ 16.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- Temperature Sensor, True Bipolar
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7328BRUZ-REEL FAQ
1.How can I place an order for AD7328BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7328BRUZ-REEL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD7328BRUZ-REEL reliable?
The price and inventory of AD7328BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7328BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7328BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7328BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7328BRUZ-REEL?
AD7328BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7328BRUZ-REEL order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD7328BRUZ-REEL?
For technical support, including AD7328BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7328BRUZ-REEL requirements.
6.How does Aetrix verify that AD7328BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7328BRUZ-REEL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD7328BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7328BRUZ-REEL?
All AD7328BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7328BRUZ-REEL, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD7328BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7328BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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