My Inquiry
My Account
Analog Devices Inc. AD7321BRUZ-REEL
- Part No.:
- AD7321BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7321BRUZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,544
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7321BRUZ-REEL from Analog Devices is a 2-channel, 12-bit plus sign successive approximation ADC fabricated on iCMOS process technology. It supports true bipolar input ranges (±10 V, ±5 V, ±2.5 V) and unipolar 0 V to +10 V range, operates at 500 kSPS throughput, features internal 2.5 V reference, and delivers 76 dB SNR in differential mode - used in industrial data acquisition systems requiring high-voltage analog signal digitization with software-configurable input scaling.
For engineers reviewing the AD7321BRUZ-REEL datasheet, AD7321BRUZ-REEL pinout, AD7321BRUZ-REEL application, or AD7321BRUZ-REEL equivalent, key selection considerations include its dual-channel sequencer, ±12 V analog supply capability, SPI/QSPI/MICROWIRE-compatible serial interface, and channel-specific software-selectable input configuration (single-ended, true differential, or pseudo-differential).
Technical Context
The AD7321BRUZ-REEL integrates a 13-bit SAR core with track-and-hold, channel sequencer, and programmable analog input structure supporting three topologies per channel. Its iCMOS process enables ±16.5 V analog supply rails while maintaining CMOS logic compatibility via separate VDRIVE and VCC domains.
Conversion is synchronized to an external SCLK up to 10 MHz; each 16-clock cycle transfers 16-bit serial data (2 zero bits, channel ID, sign bit, 12 data bits). The device supports four independent input range selections per channel, with full-scale error match ≤ ±0.006%FSR and aperture jitter of 50 ps - critical for time-coherent multi-channel sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 13-bit (12-bit plus sign), no missing codes guaranteed in differential mode |
| Throughput Rate | 500 kSPS maximum - enables real-time monitoring of fast transients in motor control feedback loops |
| Analog Input Ranges | Software-selectable per channel: ±10 V, ±5 V, ±2.5 V, or 0 V to +10 V - eliminates external gain-switching circuitry |
| Reference | Internal 2.5 V ±10 mV (25 ppm/°C), or external 2.5–3.0 V - supports ±12 V input when using 3 V external reference |
| Power Dissipation | 18 mW at 500 kSPS (VDD/VSS = ±16.5 V, VCC/VDRIVE = 5.25 V) - suitable for thermally constrained industrial modules |
| Full Power Bandwidth | 22 MHz at 3 dB - preserves fidelity of wideband sensor signals such as piezoelectric accelerometers |
| Channel Isolation | −72 dB up to 100 kHz - ensures minimal crosstalk between simultaneous measurements on VIN0 and VIN1 |
Pinout & Package
AD7321BRUZ-REEL is housed in a 14-lead TSSOP package (4.4 mm × 5 mm, 0.65 mm pitch) with exposed pad for thermal enhancement. 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 enable for conversion initiation and serial frame synchronization; must be held low for entire 16-SCLK read cycle |
| DIN | Serial Data Input | Accepts register write commands (control/range/sequencer) on SCLK falling edge; supports configuration without interrupting ongoing conversions |
| DGND (Pins 3, 13) | Digital Ground | Reference for all digital I/O; must be tied to AGND within 0.3 V transient delta to prevent latch-up or INL degradation |
| AGND (Pin 4) | Analog Ground | Reference for analog inputs, REFIN/OUT, and internal ADC core; star-point connection required for <0.5 LSB offset matching |
| REFIN/OUT (Pin 5) | Reference I/O | Provides 2.5 V internal reference output or accepts 2.5–3.0 V external reference; requires 680 nF decoupling capacitor for stability |
| VIN0 / VIN1 (Pins 7, 8) | Analog Inputs | Configurable per control register as single-ended, true differential pair, or pseudo-differential - supports mixed-mode acquisition in one device |
| VDD / VSS (Pins 9, 6) | Analog Supplies | ±12 V to ±16.5 V rails enabling true bipolar input operation; minimum ±10 V required for ±10 V range |
| VCC (Pin 10) | ADC Core Supply | 2.7–5.25 V supply for SAR logic and internal reference; independent of VDRIVE for flexible I/O voltage translation |
| VDRIVE (Pin 11) | Logic Interface Supply | 2.7–5.25 V determines digital I/O voltage levels; may differ from VCC but must not exceed it by >0.3 V |
| DOUT (Pin 12) | Serial Data Output | MSB-first 16-bit stream (2 zeros + CHID + SIGN + 12 bits); three-state disabled when CS high or during conversion |
| SCLK (Pin 14) | Serial Clock | Master clock for both data transfer and conversion timing; 10 MHz max supports 500 kSPS with 16-cycle readout |
Key Features
| Feature | Design Value |
|---|---|
| iCMOS Process Integration | Enables ±16.5 V analog supply operation with submicron CMOS logic compatibility - reduces need for level-shifting circuitry in HV industrial interfaces |
| Per-Channel Input Range Selection | Each of VIN0 and VIN1 independently programmed to ±10 V, ±5 V, ±2.5 V, or 0–10 V - allows simultaneous measurement of disparate sensor outputs (e.g., ±10 V encoder + 0–10 V pressure) |
| True Differential Input Capability | Supports noise-rejecting differential acquisition with 79 dB CMRR up to 100 kHz - critical for EMI-prone factory floor environments |
| Channel Sequencer with Auto-Rotation | Hardware-managed round-robin sequencing across both channels without processor intervention - reduces firmware overhead in cyclic data logging |
| Low-Power Shutdown Modes | Full shutdown draws only 1 µA per supply rail; autostandby reduces power to 0.75 mA at 250 kSPS - extends uptime in battery-backed DAQ systems |
Applications
| Industrial Motor Control | Programmable Logic Controller (PLC) Analog Input Module |
|---|---|
Use Scenario: Real-time acquisition of phase current and bus voltage in servo drives with ±10 V isolated sensor outputs. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing two synchronized analog signals at 500 kSPS with matched gain/offset error (<±0.006%FSR) for vector control loop closure. Use Value: Eliminates external PGA and multiplexer, reducing BOM count and layout area while maintaining 12-bit+ resolution across full industrial temperature range (−40°C to +85°C). |
Use Scenario: Modular I/O card accepting mixed-signal field inputs (4–20 mA, ±10 V, thermocouple) with software-defined range per channel. IC Role / Device Role / Timing Role: Configurable front-end ADC providing per-channel software-selectable input ranges and true differential rejection of common-mode noise on long cable runs. Use Value: Enables single-hardware design for multiple fieldbus protocols (Profibus, Modbus) without hardware jumpers or resistor networks. |
| Test & Measurement Equipment | Energy Metering Reference Design |
Use Scenario: Portable oscilloscope-like instrument capturing transient waveforms from vibration sensors and strain gauges. IC Role / Device Role / Timing Role: High-fidelity digitizer with 22 MHz full-power bandwidth and 50 ps aperture jitter - preserving signal integrity for FFT-based spectral analysis. Use Value: Achieves 76 dB SNR in differential mode without external anti-aliasing filters, simplifying analog front-end design and lowering system cost. |
Use Scenario: Revenue-grade meter measuring voltage and current simultaneously with harmonic analysis up to 50th order. IC Role / Device Role / Timing Role: Dual-channel acquisition engine with channel-to-channel isolation >−72 dB - preventing cross-talk between voltage and current sampling paths. Use Value: Supports IEC 62053-22 Class 0.2 accuracy requirements using internal reference and matched DC specs (gain/offset match ≤±0.5 LSB). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, software-configurable ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7322BRUZ | Same architecture but 1000 kSPS throughput; identical pinout and register map; requires higher SCLK (up to 20 MHz) | Better suited for high-speed control loops requiring >500 kSPS; same ±10 V input capability and iCMOS HV tolerance | Select AD7322BRUZ when system demands faster sampling without changing PCB layout or firmware register access sequence. |
| ADS8326IPW | 16-bit SAR ADC, single-channel, 500 kSPS, SPI interface; no internal reference; requires external REF and driver amplifier | Lacks dual-channel sequencer and software-selectable ranges; higher resolution but increased external component count | Choose ADS8326IPW only when 16-bit resolution is mandatory and board space permits external reference and signal conditioning circuitry. |
Compared with AD7321BRUZ-REEL, AD7322BRUZ offers doubled throughput in identical footprint for future-proofing, while ADS8326IPW trades integration for resolution - making AD7321BRUZ-REEL optimal for cost-sensitive, space-constrained dual-channel industrial DAQ where 12-bit+ performance suffices.
Availability
AD7321BRUZ-REEL is available at Aetrix Electronics and suitable for industrial motor control, PLC analog input modules, test equipment, and energy metering applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7321BRUZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD7321 is part of Analog Devices' precision data acquisition portfolio, designed specifically for industrial automation systems needing robust, software-flexible analog-to-digital conversion under harsh electrical and thermal conditions.
FAQ
What input configurations does the AD7321BRUZ-REEL support per channel?
The AD7321BRUZ-REEL supports three analog input configurations per channel: single-ended, true differential, and pseudo-differential - selected via Mode bits in the control register. Each configuration operates across all four software-selectable ranges (±10 V, ±5 V, ±2.5 V, 0–10 V), enabling flexible sensor interfacing without external reconfiguration hardware. This capability is explicitly defined in the "Analog Input Structure" section of the Rev. B datasheet.
Does the AD7321BRUZ-REEL require external components for stable operation?
Yes - the AD7321BRUZ-REEL requires a 680 nF capacitor on the REFIN/OUT pin for internal reference stability, 0.1 µF decoupling on VCC to AGND, and 0.1 µF on VDRIVE to DGND. Per the "Layout and Grounding" section, separate AGND and DGND planes must be tied at a single point with <0.3 V transient difference. These requirements are mandatory for achieving specified INL, offset match, and SNR performance.
Can the AD7321BRUZ-REEL accept ±12 V analog inputs?
Yes - when a 3.0 V external reference is applied to the REFIN/OUT pin and ±12 V (minimum) supplies are provided to VDD and VSS, the AD7321BRUZ-REEL supports true bipolar ±12 V input range. This is documented in the "Reference" section (page 27) and confirmed in Table 6 of the Rev. B datasheet, which specifies VDD/VSS ≥ ±12 V for ±12 V input operation.
How does the channel sequencer function in the AD7321BRUZ-REEL?
The AD7321BRUZ-REEL's hardware channel sequencer automatically alternates conversions between VIN0 and VIN1 in round-robin fashion when enabled via the SEQ bit in the control register. It operates independently of the host processor, eliminating software polling overhead. Sequencing occurs at full throughput (500 kSPS per channel), with channel identification bit (CHID) included in each DOUT word - verified in the "Sequencer Operation" section (page 26) and Figure 2 timing diagram.
What power modes does the AD7321BRUZ-REEL support, and how do they affect wake-up time?
The AD7321BRUZ-REEL supports Normal, Autostandby, Autoshutdown, and Full Shutdown modes. Wake-up from Autostandby takes ≤750 ns; from Full Shutdown or Autoshutdown, it takes ≤500 µs with internal reference or 25 µs with external reference. These values are specified in Table 3 (Timing Specifications, page 7) and reflect actual measured recovery times - critical for low-duty-cycle sensor polling applications.
AD7321BRUZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iCMOS®
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-REEL FAQ
1.How can I place an order for AD7321BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7321BRUZ-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 AD7321BRUZ-REEL reliable?
The price and inventory of AD7321BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7321BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7321BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7321BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7321BRUZ-REEL?
AD7321BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7321BRUZ-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 AD7321BRUZ-REEL?
For technical support, including AD7321BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7321BRUZ-REEL requirements.
6.How does Aetrix verify that AD7321BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7321BRUZ-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 AD7321BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7321BRUZ-REEL?
All AD7321BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7321BRUZ-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 AD7321BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7321BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7321BRUZ-REEL Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
