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Analog Devices Inc. AD7934BRUZ-REEL7
- Part No.:
- AD7934BRUZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7934BRUZ-REEL7.pdf
- Description:
- IC ADC 12BIT SAR 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,649
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Product details
Overview
AD7934BRUZ-REEL7 from Analog Devices is a 12-bit, 4-channel, 1.5 MSPS successive approximation register (SAR) analog-to-digital converter with integrated channel sequencer and on-chip 2.5 V reference. It operates from a single 2.7 V to 5.25 V supply, supports single-ended/pseudo-differential/differential input configurations via software control, and delivers 70 dB SINAD at 50 kHz input frequency. It is used in high-speed data acquisition systems requiring multi-channel sampling without pipeline delay.
For engineers reviewing the AD7934BRUZ-REEL7 datasheet, AD7934BRUZ-REEL7 pinout, AD7934BRUZ-REEL7 application, or AD7934BRUZ-REEL7 equivalent, key selection criteria include guaranteed 12-bit no-missed-codes performance, ±0.2% internal reference accuracy at 25°C, 28-lead TSSOP package compatibility, and parallel word/byte interface support for microprocessor/DSP interfacing.
Technical Context
The AD7934BRUZ-REEL7 implements a SAR architecture with a differential track-and-hold amplifier capable of handling input frequencies up to 50 MHz. Its on-chip sequencer enables preprogrammed, automatic cycling across four analog inputs without host intervention.
Conversion is triggered by the falling edge of CONVST, with completion signaled by BUSY going low after exactly 13 CLKIN cycles. The VDRIVE pin decouples logic interface voltage (2.7 V–5.25 V) from analog supply (VDD), enabling direct connection to 3 V or 5 V processors independent of VDD level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees monotonic output and no missing codes over full temperature range (−40°C to +85°C). |
| Throughput Rate | 1.5 MSPS - maximum sustained sampling rate with full DC and AC performance maintained. |
| SINAD | 70 dB min (differential mode, fIN = 50 kHz) - defines effective dynamic range for precision signal capture. |
| Internal Reference | 2.5 V ±0.2% @ 25°C, 25 ppm/°C max - eliminates need for external reference in cost-sensitive designs. |
| Power Dissipation | 6 mW max @ 3 V, 13.5 mW max @ 5 V - enables high-speed operation in power-constrained embedded systems. |
| Input Configuration | Software-selectable: 4× single-ended, 2× fully differential, or 2× pseudo-differential - reduces external signal conditioning components. |
| Package | 28-lead TSSOP - surface-mount footprint compatible with standard PCB assembly processes. |
Pinout & Package
AD7934BRUZ-REEL7 is housed in a 28-lead thin shrink small-outline package (TSSOP) with exposed pad (RUZ suffix). Pin 1 is marked by a dot; pin numbering proceeds counterclockwise. AGND and DGND must be kept within 0.3 V potential difference, and VREFIN/VREFOUT requires a 470 nF decoupling capacitor to AGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN0–VIN3 | Analog Input Channels | Four multiplexed inputs configurable as single-ended, pseudo-differential, or fully differential pairs via control register MODE bits. |
| CONVST | Conversion Start | Falling-edge-triggered; initiates track-to-hold transition and starts conversion sequence. |
| BUSY | Status Output | Active-high open-drain signal indicating conversion in progress; goes low when result is latched and ready to read. |
| CS, RD, WR | Parallel Interface Controls | Standard active-low chip select, read, and write signals enabling direct connection to 8-/16-bit microprocessors or DSPs. |
| W/B, DB0–DB11 | Data Interface | Word/byte mode selection (W/B) and 12-bit parallel data bus supporting both 12-bit word and 8-bit byte transfer protocols. |
| VDRIVE | Logic Supply | Independent voltage rail (2.7 V–5.25 V) setting logic threshold levels-allows interfacing with 3 V or 5 V hosts regardless of VDD. |
| VREFIN/VREFOUT | Reference I/O | Provides 2.5 V internal reference; can be overdriven with external reference (0.1 V to VDD) for improved accuracy or flexibility. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True SAR architecture ensures deterministic, one-shot conversion latency of exactly 13 clock cycles - critical for real-time closed-loop control. |
| Configurable analog input structure | Single register bit settings enable runtime reconfiguration among 4× SE, 2× FD, or 2× PD modes - reduces BOM count and board space. |
| VDRIVE interface independence | Separate logic supply allows simultaneous use of 3 V analog domain and 5 V processor bus - avoids level-shifter components. |
| On-chip sequencer | Automatically cycles through up to four channels in user-defined order without CPU overhead - simplifies firmware for multi-sensor monitoring. |
| Full shutdown mode | 2 μA max quiescent current - enables ultra-low-power sleep states in battery-operated data loggers between sampling bursts. |
Applications
| Motor Control Feedback | Industrial Process Monitoring |
|---|---|
Use Scenario: Simultaneous sampling of phase currents and DC bus voltage in three-phase inverter drives. IC Role / Device Role / Timing Role: ADC front-end capturing synchronized analog feedback signals with sub-10 ns aperture jitter for precise field-oriented control. Use Value: Enables accurate torque estimation and fast overcurrent protection using 12-bit resolution and 1.5 MSPS throughput across four channels. |
Use Scenario: Multi-point temperature, pressure, and flow sensor digitization in PLC analog input modules. IC Role / Device Role / Timing Role: High-accuracy, multi-channel data acquisition engine with integrated sequencer reducing host polling overhead. Use Value: Delivers 70 dB SINAD and ±1 LSB INL to meet IEC 61000-4-3 immunity requirements while minimizing external calibration components. |
| Medical Instrumentation | Test & Measurement Equipment |
Use Scenario: Digitizing ECG, EEG, and bioimpedance waveforms in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise, low-power ADC providing 12-bit resolution and 2.5 V reference stability for clinical-grade signal fidelity. Use Value: Achieves 71 dB SNR (differential mode) and 25 ppm/°C reference drift - meets AAMI EC11 linearity and repeatability thresholds. |
Use Scenario: Embedded digitizer in benchtop oscilloscopes and automated test equipment requiring flexible input ranges. IC Role / Device Role / Timing Role: Configurable-input ADC supporting single-ended, pseudo-differential, and fully differential modes per channel. Use Value: Eliminates need for external gain/level-shift circuitry via software-selectable 0–VREF or 0–2×VREF input ranges and coding options. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed multi-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7938BRUZ | 8-channel, 12-bit, same 1.5 MSPS throughput but larger 32-lead TSSOP package and higher IDD (3.2 mA typ @ 5 V). | Supports double the channel count but requires more PCB area and power; sequencer behavior differs in auto-cycle depth. | Select AD7938BRUZ only when >4 channels are required and layout space permits larger footprint. |
| ADS8325IPW | 16-bit, 100 kSPS, SPI interface, no internal reference - requires external 4.096 V reference and serial interface design. | Higher resolution but 15× slower throughput; lacks parallel interface and sequencer - unsuitable for real-time multi-channel streaming. | Choose ADS8325IPW only for static or low-rate precision measurements where resolution outweighs speed and integration. |
Compared with AD7934BRUZ-REEL7, AD7938BRUZ trades channel count and package size for identical speed and reference integration, while ADS8325IPW sacrifices throughput and interface simplicity for higher resolution - making AD7934BRUZ-REEL7 optimal for balanced speed, channel density, and system-level integration.
Availability
AD7934BRUZ-REEL7 is available at Aetrix Electronics and suitable for motor control feedback, industrial process monitoring, medical instrumentation, and test & measurement equipment requiring stable component supply and long-term production continuity.
Supply support for AD7934BRUZ-REEL7 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 Wilmington, MA.
The AD793x family was designed specifically for high-speed, multi-channel data acquisition in space- and power-constrained industrial and medical systems - emphasizing integration, configurability, and deterministic timing.
FAQ
What is the guaranteed no-missed-codes resolution of AD7934BRUZ-REEL7?
AD7934BRUZ-REEL7 guarantees no missed codes across its full 12-bit range under all operating conditions (−40°C to +85°C, 2.7 V–5.25 V supply). This is confirmed in the AD7934 Specifications table (Page 5), where Differential Nonlinearity is specified as ±0.95 LSB max in differential mode and −0.95/+1.5 LSB max in single-ended mode - both ensuring monotonicity and full 12-bit code coverage.
Does AD7934BRUZ-REEL7 require an external reference?
No, AD7934BRUZ-REEL7 does not require an external reference. It features an accurate on-chip 2.5 V reference with ±0.2% maximum error at 25°C and 25 ppm/°C temperature coefficient. However, the VREFIN/VREFOUT pin can be overdriven with an external reference (0.1 V to VDD) if higher precision or custom voltage scaling is needed - as documented in the Reference section (Page 22).
How does the sequencer function in AD7934BRUZ-REEL7?
The AD7934BRUZ-REEL7 sequencer automatically cycles through up to four analog input channels (VIN0–VIN3) in a user-programmed order stored in the control register. Once enabled, it performs conversions without host intervention - reducing firmware overhead and enabling deterministic multi-channel sampling. Sequencing behavior, including channel order and repeat mode, is configured via the SEQ bit and ADD[1:0] fields in the control register (Pages 15–16).
What is the role of the VDRIVE pin on AD7934BRUZ-REEL7?
The VDRIVE pin on AD7934BRUZ-REEL7 sets the logic threshold voltage for all digital I/O pins (DB0–DB11, CS, RD, WR, etc.), independent of the analog supply VDD. This allows the AD7934BRUZ-REEL7 to interface directly with 3 V or 5 V microprocessors even when VDD is at a different voltage - eliminating level shifters. VDRIVE must remain within −0.3 V to VDD + 0.3 V (Absolute Maximum Ratings, Page 8).
Can AD7934BRUZ-REEL7 operate with a 3 V supply while interfacing to a 5 V processor bus?
Yes, AD7934BRUZ-REEL7 can operate with a 3 V VDD supply while interfacing to a 5 V processor bus. Set VDRIVE = 5 V to configure digital I/O thresholds for 5 V logic levels, while maintaining 3 V analog supply for lower power consumption (6 mW max). This dual-supply capability is explicitly supported per the Product Highlights (Page 1) and Power Requirements table (Page 6).
AD7934BRUZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1.5M
- Number of Inputs:
- 4
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- Data Interface:
- Parallel
- 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:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7934BRUZ-REEL7 FAQ
1.How can I place an order for AD7934BRUZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7934BRUZ-REEL7 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 AD7934BRUZ-REEL7 reliable?
The price and inventory of AD7934BRUZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7934BRUZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7934BRUZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7934BRUZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7934BRUZ-REEL7?
AD7934BRUZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7934BRUZ-REEL7 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 AD7934BRUZ-REEL7?
For technical support, including AD7934BRUZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7934BRUZ-REEL7 requirements.
6.How does Aetrix verify that AD7934BRUZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7934BRUZ-REEL7 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 AD7934BRUZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7934BRUZ-REEL7?
All AD7934BRUZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7934BRUZ-REEL7, 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 AD7934BRUZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7934BRUZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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