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Analog Devices Inc. AD7329BRUZ-REEL
- Part No.:
- AD7329BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7329BRUZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,364
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Product details
Overview
AD7329BRUZ-REEL from Analog Devices is a 12-bit plus sign (13-bit resolution), 8-channel, software-selectable true bipolar input successive approximation ADC with 1 MSPS throughput, ±10 V/±5 V/±2.5 V/0 V to +10 V input ranges, and iCMOS process technology - used in industrial data acquisition systems requiring high-voltage analog signal digitization with channel sequencing and flexible input configuration.
For engineers reviewing the AD7329BRUZ-REEL datasheet, AD7329BRUZ-REEL pinout, AD7329BRUZ-REEL application, or AD7329BRUZ-REEL equivalent, key selection considerations include true differential/single-ended/pseudo-differential input support per channel, MUXOUT±/ADCIN± signal conditioning access, internal 2.5 V reference with external reference option, SPI/QSPI/MICROWIRE-compatible serial interface, and low-power 21 mW operation at full throughput.
Technical Context
The AD7329BRUZ-REEL integrates an 8-channel analog multiplexer with independent per-channel range programming (±10 V, ±5 V, ±2.5 V, 0 V to +10 V) and configurable input mode (single-ended, true differential, or pseudo-differential), all controlled via on-chip registers. Its iCMOS process enables ±16.5 V analog supply rails while maintaining CMOS logic compatibility.
It features separate MUXOUT± and ADCIN± terminals for external signal conditioning between multiplexer and ADC core, supports straight binary or two's complement output coding, and includes a built-in temperature indicator. Power management includes four modes: normal, autostandby, autoshutdown, and full shutdown - with IDD/ISS dropping to 1 µA in shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit plus sign (13-bit effective), no missing codes guaranteed in differential mode |
| Throughput Rate | 1 MSPS maximum - enables real-time sampling of signals up to 20 MHz full-power bandwidth |
| Analog Input Ranges | Software-selectable per channel: ±10 V, ±5 V, ±2.5 V, or 0 V to +10 V - supports mixed-range configurations |
| Reference | Internal 2.5 V ±10 mV (25 ppm/°C), with REFIN/REFOUT pin supporting external reference (e.g., 3 V for ±12 V input) |
| Power Dissipation | 21 mW at 1 MSPS (VDD = 12 V, VSS = −12 V, VCC = 5 V) - enables thermally constrained industrial designs |
| Input Impedance | High analog input impedance (>1 GΩ DC leakage < ±100 nA) - minimizes loading on sensor/conditioning circuits |
| Serial Interface | SPI-/QSPI-/DSP-/MICROWIRE™-compatible, 16-clock-cycle frame, MSB-first, 3-wire operation |
Pinout & Package
AD7329BRUZ-REEL is housed in a 24-lead TSSOP package (4.4 mm × 7.8 mm, 0.65 mm pitch) with exposed pad for thermal enhancement. 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 control initiating conversion and framing serial data transfer - requires minimum 5 ns pulse width |
| DIN / DOUT / SCLK | Serial Interface | 3-wire SPI-compatible I/O - DIN clocks register writes on SCLK falling edge; DOUT outputs 16-bit data (3-bit channel ID + sign + 12-bit code) on falling edge |
| VIN0–VIN7 | Analog Inputs | Eight high-voltage inputs (±10 V capable); each independently configurable as single-ended, true differential pair, or pseudo-differential |
| MUXOUT+ / MUXOUT− | Multiplexer Output | Direct access to mux output before ADC sampling - enables external filtering, gain, or isolation prior to ADCIN± |
| ADCIN+ / ADCIN− | ADC Core Input | Inputs to track-and-hold and SAR core - decoupled from mux path to allow signal conditioning; ADCIN− tied to AGND in single-ended mode |
| REFIN/REFOUT | Reference I/O | 2.5 V internal reference output or external reference input - requires 680 nF capacitor; enables ±12 V input with 3 V external reference |
| VDD / VSS / VCC / VDRIVE | Power Supplies | VDD/VSS = ±12 V to ±16.5 V analog rails; VCC = 2.7–5.25 V ADC core; VDRIVE = 2.7–5.25 V logic interface voltage (≤ VCC + 0.3 V) |
Key Features
| Feature | Design Value |
|---|---|
| True bipolar input capability | Accepts ±10 V, ±5 V, ±2.5 V signals without external level-shifting - simplifies sensor interfacing in industrial control |
| Per-channel software-selectable range | Each of eight inputs independently configured for ±10 V, ±5 V, ±2.5 V, or 0 V to +10 V - eliminates external gain-switching circuitry |
| Separate MUXOUT± and ADCIN± terminals | Enables external op-amp conditioning (e.g., anti-alias filtering, isolation, gain) between multiplexer and ADC core - improves SNR and system flexibility |
| iCMOS process technology | Combines high-voltage analog (±16.5 V) and low-voltage digital (2.7–5.25 V) domains in one die - reduces board space vs. discrete HV/CMOS solutions |
| Low power at full speed | 21 mW at 1 MSPS (vs. >100 mW for comparable older-generation HV ADCs) - suitable for fanless or battery-backed DAQ modules |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Continuous monitoring of multiple 4–20 mA current loops, thermocouple outputs, and ±10 V PLC analog I/O in factory automation cabinets. IC Role / Device Role / Timing Role: 8-channel simultaneous-sampling-capable ADC with per-channel range selection digitizes mixed-signal sensor data for real-time control and logging. Use Value: Eliminates need for external signal conditioning per channel; ±10 V input range directly interfaces with industrial transmitters without attenuation or amplification. |
Use Scenario: Modular benchtop multimeters and automated test equipment requiring high-accuracy, multi-range analog input capture. IC Role / Device Role / Timing Role: High-speed SAR ADC with 1 MSPS throughput and 77 dB SNR in differential mode provides precision waveform capture and harmonic analysis. Use Value: Internal 2.5 V reference (±10 mV accuracy) and low THD (−87 dB) enable calibrated measurements without external reference trimming. |
| Energy Metering Front-End | Motor Drive Current Sensing |
|
Use Scenario: Digitizing voltage and current transformer outputs in polyphase smart meters with anti-tampering requirements. IC Role / Device Role / Timing Role: True differential input mode rejects common-mode noise from switching power supplies; channel sequencer captures synchronized voltage/current samples. Use Value: −79 dB CMRR up to 100 kHz suppresses EMI from inverters and rectifiers; high input impedance avoids burden on CT secondaries. |
Use Scenario: Real-time phase current sampling in servo drives and inverters using shunt resistors or isolated amplifiers. IC Role / Device Role / Timing Role: Pseudo-differential input mode accepts asymmetric signals from isolated amplifiers (e.g., AMC1301); MUXOUT+/ADCIN+ separation allows RC filtering before sampling. Use Value: 300 ns track-and-hold acquisition time supports accurate sampling of fast current transients; 20 MHz full-power bandwidth captures PWM ripple components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage, multi-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7328BRUZ | Same 8-channel, 12-bit plus sign architecture but fixed ±10 V/±5 V/0–10 V ranges (no ±2.5 V); 1 MSPS max, identical pinout and serial interface | Lacks per-channel ±2.5 V range - unsuitable for low-level sensor interfaces requiring higher resolution at smaller spans | Select AD7328BRUZ only if ±2.5 V range is unnecessary and cost sensitivity outweighs flexibility |
| AD7606BSTZ | 8-channel, 16-bit SAR ADC with simultaneous sampling, ±10 V input, internal reference, but no software-selectable per-channel ranges or pseudo-differential mode | Higher resolution (16-bit) but fixed input structure - requires external multiplexing or gain stages for mixed-range systems | Choose AD7606BSTZ when absolute precision >12-bit is required and all channels use same range; not drop-in compatible due to different register map and timing |
Compared with AD7328BRUZ and AD7606BSTZ, the AD7329BRUZ-REEL uniquely supports per-channel ±2.5 V range selection and pseudo-differential inputs - enabling compact, flexible front-ends for heterogeneous sensor arrays without external reconfiguration hardware.
Availability
AD7329BRUZ-REEL is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, energy metering front-ends, and motor drive current sensing requiring stable component supply across extended temperature (−40°C to +85°C) and long-lifecycle deployments.
Supply support for AD7329BRUZ-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, with design and manufacturing expertise spanning precision data conversion, power management, and RF technologies.
The AD7329BRUZ-REEL belongs to Analog Devices' iCMOS-based precision SAR ADC product line, engineered specifically for industrial and instrumentation applications demanding wide-input-voltage-range digitization, low power, and flexible channel configuration without external support circuitry.
FAQ
What input voltage ranges does the AD7329BRUZ-REEL support, and how are they selected?
The AD7329BRUZ-REEL supports four software-selectable input ranges per channel: ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V. Selection is performed by writing to dedicated range registers via the serial interface - each of the eight analog inputs can be independently assigned any of these ranges. This eliminates the need for external gain-switching circuitry and enables mixed-range signal acquisition on a single device. The AD7329BRUZ-REEL requires appropriate VDD/VSS supply voltages (e.g., ±10 V min for ±10 V range) as specified in the datasheet.
Does the AD7329BRUZ-REEL require an external reference, or does it have an internal one?
The AD7329BRUZ-REEL includes an internal 2.5 V reference with ±10 mV accuracy over temperature and 25 ppm/°C drift, accessible via the REFIN/REFOUT pin. It also supports external reference operation: applying a 3 V reference to REFIN/REFOUT enables true bipolar ±12 V analog input capability. A 680 nF capacitor is mandatory on the REFIN/REFOUT pin regardless of reference source. The AD7329BRUZ-REEL defaults to external reference mode on power-up, so the internal reference must be explicitly enabled via register configuration.
How does the AD7329BRUZ-REEL handle differential and pseudo-differential input configurations?
The AD7329BRUZ-REEL supports three input modes per channel: single-ended, true differential, and pseudo-differential - selected via Mode bits in the control register. In true differential mode, VIN+ and VIN− form a matched pair with 79 dB CMRR up to 100 kHz. In pseudo-differential mode, VIN− serves as a common-mode reference (not inverted), allowing digitization of asymmetric signals like those from isolated amplifiers. The AD7329BRUZ-REEL's MUXOUT− and ADCIN− pins provide physical access points to implement either configuration correctly.
What is the purpose of the MUXOUT+ and MUXOUT− pins on the AD7329BRUZ-REEL?
MUXOUT+ and MUXOUT− provide direct access to the output of the internal 8-channel analog multiplexer - before the signal reaches the track-and-hold and ADC core. This allows designers to insert external circuitry (e.g., RC anti-alias filters, isolation amplifiers, or gain stages) between the multiplexer and ADC, improving noise immunity, bandwidth control, and signal integrity. In single-ended mode, MUXOUT− may be tied to AGND; in differential mode, both MUXOUT+ and MUXOUT− carry high-voltage signals routed to ADCIN+ and ADCIN− respectively. The AD7329BRUZ-REEL's functional block diagram confirms this signal path separation.
What power supply configurations are required for the AD7329BRUZ-REEL to operate at full specification?
The AD7329BRUZ-REEL requires three independent supply domains: VDD (+12 V to +16.5 V) and VSS (−12 V to −16.5 V) for the analog input section; VCC (2.7 V to 5.25 V) for the ADC core; and VDRIVE (2.7 V to 5.25 V, ≤ VCC + 0.3 V) for the digital interface. Decoupling is critical: VCC must be decoupled to AGND, VDRIVE to DGND, and a 680 nF capacitor is mandatory on REFIN/REFOUT. Supply sequencing is not strictly required, but powering VDD/VSS before VCC ensures proper analog biasing. The AD7329BRUZ-REEL achieves 21 mW at 1 MSPS under nominal 12 V/−12 V/5 V conditions.
AD7329BRUZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iCMOS®
- Package/Case:
- 24-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:
- True Bipolar
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7329BRUZ-REEL FAQ
1.How can I place an order for AD7329BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7329BRUZ-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 AD7329BRUZ-REEL reliable?
The price and inventory of AD7329BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7329BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7329BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7329BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7329BRUZ-REEL?
AD7329BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7329BRUZ-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 AD7329BRUZ-REEL?
For technical support, including AD7329BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7329BRUZ-REEL requirements.
6.How does Aetrix verify that AD7329BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7329BRUZ-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 AD7329BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7329BRUZ-REEL?
All AD7329BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7329BRUZ-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 AD7329BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7329BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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