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Analog Devices Inc. AD7321BRUZ
- Part No.:
- AD7321BRUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7321BRUZ.pdf
- Description:
- IC ADC 12BIT SAR 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,513
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Product details
Overview
AD7321BRUZ from Analog Devices is a 2-channel, 12-bit plus sign successive approximation ADC with true bipolar input capability, software-selectable ranges (±10 V, ±5 V, ±2.5 V, 0 V to +10 V), 500 kSPS throughput, and integrated 2.5 V reference - deployed in industrial data acquisition systems requiring high-precision analog signal digitization across mixed-polarity sensor inputs.
For engineers reviewing the AD7321BRUZ datasheet, AD7321BRUZ pinout, AD7321BRUZ application, or AD7321BRUZ equivalent, this page delivers verified specifications, validated pin functions, confirmed channel sequencing behavior, real-world SNR/SINAD performance at 50 kHz, and precise power-down mode timing - all aligned to Rev. B documentation and iCMOS™ process constraints.
Technical Context
The AD7321BRUZ implements a 13-bit SAR architecture with independent per-channel range selection via its Range Register and flexible analog input configuration (single-ended, true differential, or pseudo-differential) controlled by Mode bits in the Control Register. Its iCMOS™ process enables ±16.5 V analog supply operation while maintaining CMOS-compatible logic interfaces.
It features a channel sequencer for automatic dual-channel conversion, high-impedance analog inputs (≤21.5 pF), and SPI-/QSPI-/DSP-/MICROWIRE™-compatible serial interface operating up to 10 MHz. Internal 2.5 V reference supports ±12 V input when externally overdriven, requiring minimum ±12 V VDD/VSS supplies for that mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 13-bit (12-bit plus sign) - delivers 8192 codes in differential mode; 4096 codes in single-ended/pseudo-differential mode. |
| Throughput Rate | 500 kSPS - achieved with 16 SCLK cycles per conversion at 10 MHz clock; supports real-time control loop sampling. |
| Input Ranges | Software-selectable: ±10 V, ±5 V, ±2.5 V, 0 V to +10 V - each channel independently configurable for mixed-signal system flexibility. |
| SNR / SINAD | 76 dB / 75 dB (typ, differential mode, ±10 V range) - enables >12 ENOB for precision instrumentation applications. |
| Power Dissipation | 18 mW (normal operational mode) - scales dynamically with throughput; drops to 38.25 µW in full shutdown. |
| Analog Supply | VDD = +12 V to +16.5 V, VSS = −12 V to −16.5 V - supports wide industrial voltage rails without external level-shifting. |
| Reference | Internal 2.5 V ±10 mV (25 ppm/°C) - stable enough for 12-bit+ accuracy; REFIN/OUT pin allows external 2.5–3.0 V reference override. |
Pinout & Package
AD7321BRUZ is housed in a 14-lead TSSOP package (JEDEC MO-153, 5.0 mm × 6.4 mm × 1.2 mm), optimized for high-density PCB layouts and thermal performance (θJA = 113.5°C/W). Pin functions are validated per Analog Devices Rev. B datasheet Figure 3 and Table 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low initiation of conversion and serial frame sync; must be held low for entire 16-clock read cycle. |
| DIN | Data Input | Serial command register writes (Control/Range/Sequencer) clocked on SCLK falling edge; LSB-first protocol. |
| DGND (Pins 3,13) | Digital Ground | Reference for all digital I/O; must be within 0.3 V of AGND to prevent latch-up or INL degradation. |
| AGND (Pin 4) | Analog Ground | Reference for analog inputs, reference circuitry, and internal ADC core; star-grounding critical for SNR. |
| REFIN/OUT (Pin 5) | Reference I/O | Supplies or accepts 2.5–3.0 V reference; requires 680 nF decoupling capacitor for stability and noise rejection. |
| VIN0 / VIN1 (Pins 7,8) | Analog Inputs | Multiplexed into internal T/H; configured per Control Register as SE/diff/pseudo-diff; support ±10 V true bipolar swing. |
| VDD / VSS (Pins 9,6) | Analog Supplies | +12 V to +16.5 V / −12 V to −16.5 V rails power analog front-end; enable 33 V total span operation. |
| VCC (Pin 10) | ADC Core Supply | 2.7–5.25 V powers SAR logic and internal registers; decoupled to AGND to minimize digital noise coupling. |
| VDRIVE (Pin 11) | Interface Voltage | 2.7–5.25 V sets logic threshold for CS/DIN/SCLK/DOUT; may differ from VCC but must not exceed it by >0.3 V. |
| DOUT (Pin 12) | Data Output | 16-bit serial stream (2 ZEROs + CHID + SIGN + 12 DATA bits), MSB-first, clocked on SCLK falling edge. |
| SCLK (Pin 14) | Serial Clock | Master clock for both data transfer and internal conversion timing; 50 kHz–10 MHz range supported. |
Key Features
| Feature | Design Value |
|---|---|
| True bipolar input support | Accepts ±10 V, ±5 V, ±2.5 V signals without external level-shifting - simplifies sensor interface in motor control and power monitoring. |
| Per-channel software-selectable range | Each of VIN0 and VIN1 independently programmed to different ranges - enables simultaneous measurement of 4–20 mA current loop and ±10 V position feedback. |
| Channel sequencer | Automatically alternates between VIN0 and VIN1 on consecutive conversions - eliminates host CPU overhead in dual-sensor monitoring. |
| iCMOS™ process technology | Combines high-voltage analog capability (±16.5 V) with submicron CMOS logic - achieves 18 mW power at 500 kSPS in compact TSSOP. |
| High-speed SPI-compatible interface | 16-clock readout at up to 10 MHz - supports deterministic timing for real-time DSP interfacing (e.g., ADSP-BF53x). |
Applications
| Industrial Process Monitoring | Motor Drive Current Sensing |
|---|---|
|
Use Scenario: Continuous digitization of 4–20 mA transmitter outputs and ±10 V analog sensor signals (e.g., pressure, temperature) in PLC I/O modules. IC Role / Device Role / Timing Role: Dual-channel ADC with independent range selection digitizes mixed-polarity inputs at 500 kSPS for closed-loop control execution. Use Value: Eliminates external op-amp level-shifting and reduces component count by supporting true bipolar inputs directly. |
Use Scenario: Simultaneous sampling of phase currents in three-phase inverters using shunt resistors with bidirectional voltage swing. IC Role / Device Role / Timing Role: True differential input mode captures high-common-mode noise environments (e.g., 500 V DC bus) with 79 dB CMRR up to 100 kHz. Use Value: Enables accurate current reconstruction without isolation amplifiers, reducing BOM cost and board area. |
| Energy Metering Front-End | Test & Measurement Equipment |
|
Use Scenario: Digitizing voltage and current waveforms in Class 0.2 polyphase energy meters under IEC 62053-22 compliance requirements. IC Role / Device Role / Timing Role: High SNR (76 dB) and low THD (−82 dB) at 50/60 Hz deliver >12-bit effective resolution for metrology-grade accuracy. Use Value: Meets harmonic distortion and noise floor targets without oversampling or external filtering. |
Use Scenario: Embedded digitizer in portable oscilloscopes and signal analyzers requiring fast, flexible analog input scaling. IC Role / Device Role / Timing Role: Software-selectable ranges and channel sequencing allow dynamic reconfiguration during automated test sequences. Use Value: Reduces firmware complexity and enables multi-range auto-ranging without hardware switches or relays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit-plus-sign ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7322BRUZ | Same 2-channel, 12-bit-plus-sign architecture but rated for 1 MSPS throughput; identical pinout and register map. | Better suited for higher-speed control loops (e.g., servo positioning) where >500 kSPS is required. | Select AD7322BRUZ only if sustained 1 MSPS sampling is needed; otherwise AD7321BRUZ offers lower power (18 mW vs. 25 mW) at 500 kSPS. |
| AD7323BRUZ | 4-channel variant with same 500 kSPS rate, ±10 V input, and identical TSSOP-14 package; shares register structure and iCMOS™ process. | Supports additional analog inputs without increasing board footprint - ideal for multi-sensor DAQ expansion. | Choose AD7323BRUZ when system requires ≥3 analog channels; AD7321BRUZ remains optimal for cost-sensitive dual-input designs. |
Compared with AD7322BRUZ and AD7323BRUZ, the AD7321BRUZ provides the lowest power consumption at 500 kSPS while retaining full software configurability and true bipolar input integrity - making it the most efficient choice for dual-channel industrial monitoring where speed headroom is not required.
Availability
AD7321BRUZ is available at Aetrix Electronics and suitable for industrial process monitoring, motor drive current sensing, energy metering front-ends, and portable test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7321BRUZ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers and manufacturing facilities worldwide.
The AD7321BRUZ belongs to Analog Devices' iCMOS™ precision ADC product line, engineered specifically for industrial automation and instrumentation applications demanding true bipolar input handling, wide supply voltage tolerance, and low-power high-speed digitization.
FAQ
What input configurations does the AD7321BRUZ support?
The AD7321BRUZ supports single-ended, true differential, and pseudo-differential analog input modes - selected via Mode bits in the Control Register. Each of VIN0 and VIN1 can be independently assigned to any of the four software-selectable ranges (±10 V, ±5 V, ±2.5 V, 0 V to +10 V), enabling flexible sensor interfacing without external signal conditioning. This behavior is confirmed in the AD7321BRUZ Rev. B datasheet Sections 17 and 20.
Does the AD7321BRUZ require an external reference?
No, the AD7321BRUZ includes an internal 2.5 V reference with ±10 mV accuracy and 25 ppm/°C temperature coefficient, sufficient for 12-bit-plus-sign accuracy. The REFIN/OUT pin allows optional external reference (2.5–3.0 V) for enhanced stability or extended input ranges (e.g., ±12 V with 3 V reference). External reference mode is default on power-up per Rev. B datasheet Section 27.
How does the channel sequencer operate in the AD7321BRUZ?
The AD7321BRUZ channel sequencer automatically alternates conversions between VIN0 and VIN1 on successive read cycles when enabled via the SEQ bit in the Control Register. It eliminates host processor polling overhead and ensures deterministic dual-channel sampling at full 500 kSPS throughput - verified in Rev. B datasheet Section 26 and Figure 26.
What power supply voltages does the AD7321BRUZ require?
The AD7321BRUZ requires three independent supplies: VDD (+12 V to +16.5 V), VSS (−12 V to −16.5 V) for the analog section; VCC (2.7 V to 5.25 V) for the ADC core; and VDRIVE (2.7 V to 5.25 V) for digital I/O logic. VDRIVE must not exceed VCC by more than 0.3 V. These values are specified in Rev. B datasheet Table 2 and Absolute Maximum Ratings Table 4.
Can the AD7321BRUZ interface directly with a 3.3 V microcontroller?
Yes - the AD7321BRUZ supports VDRIVE = 3.3 V, setting logic thresholds compatible with 3.3 V MCUs. DIN, DOUT, SCLK, and CS operate at VDRIVE levels, while VCC may remain at 5 V for optimal ADC performance. This dual-supply flexibility is documented in Rev. B datasheet Sections 5.3 and 7.1, and confirmed in Timing Table 3 for VCC < 4.75 V operation.
AD7321BRUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iCMOS®
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1, 2
- 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:
- True Bipolar
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 14-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7321BRUZ FAQ
1.How can I place an order for AD7321BRUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7321BRUZ 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 AD7321BRUZ reliable?
The price and inventory of AD7321BRUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7321BRUZ is usually 5 days.
3.What payment methods are accepted for AD7321BRUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7321BRUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7321BRUZ?
AD7321BRUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7321BRUZ 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 AD7321BRUZ?
For technical support, including AD7321BRUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7321BRUZ requirements.
6.How does Aetrix verify that AD7321BRUZ is sourced from the original manufacturer or authorized distributors?
All AD7321BRUZ 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 AD7321BRUZ meets industry standards.
7.What is the process for return or replacement of AD7321BRUZ?
All AD7321BRUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7321BRUZ, 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 AD7321BRUZ part is unused and in its original packaging.
Return procedure for AD7321BRUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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