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Analog Devices Inc. AD7938BSUZ-REEL7
- Part No.:
- AD7938BSUZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-TQFP
- Datasheet:
-
AD7938BSUZ-REEL7.pdf
- Description:
- IC ADC 12BIT SAR 32TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:308
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Product details
Overview
AD7938BSUZ-REEL7 from Analog Devices is a 12-bit, 8-channel, 1.5 MSPS successive approximation register (SAR) analog-to-digital converter with integrated channel sequencer and on-chip 2.5 V reference. It supports single-ended, pseudo-differential, and fully differential input configurations, operates from a single 2.7 V to 5.25 V supply, and delivers 69 dB SINAD at 50 kHz input frequency. It is used in high-speed data acquisition systems requiring precise multi-channel sampling without pipeline delay.
For engineers reviewing the AD7938BSUZ-REEL7 datasheet, AD7938BSUZ-REEL7 pinout, AD7938BSUZ-REEL7 application, or AD7938BSUZ-REEL7 equivalent, key selection considerations include its 12-bit resolution, 8-channel sequencer, parallel word/byte interface, VDRIVE voltage independence, and 32-lead LFCSP package compatibility with space-constrained industrial and instrumentation designs.
Technical Context
The AD7938BSUZ-REEL7 implements a SAR architecture with a differential track-and-hold amplifier capable of handling input frequencies up to 50 MHz. Its sequencer enables preprogrammed, software-configurable conversion sequences across eight analog inputs without host intervention.
It features dual-supply flexibility via separate VDD (2.7–5.25 V) and VDRIVE (2.7–5.25 V) pins, allowing direct interfacing with 3 V or 5 V microprocessors independent of analog supply. Conversion is initiated by a falling edge on CONVST, with BUSY signaling completion and no pipeline latency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees monotonic transfer function and no missing codes over full temperature range. |
| Throughput Rate | 1.5 MSPS - enables real-time sampling of fast transients in motor control or power quality monitoring. |
| SINAD | 69 dB min at 50 kHz - ensures accurate digitization of medium-bandwidth sensor signals with low distortion. |
| On-Chip Reference | 2.5 V ±0.2% @ 25°C, 25 ppm/°C max - eliminates need for external precision reference in cost-sensitive designs. |
| Power Dissipation | 6 mW max at 3 V / 1.5 MSPS - supports thermally constrained embedded systems without active cooling. |
| Analog Input Configurations | Single-ended, pseudo-differential, or fully differential - allows flexible signal conditioning for varied sensor types (e.g., RTDs, strain gauges, current shunts). |
| Package | 32-lead LFCSP (5 mm × 5 mm, 0.5 mm pitch) - provides low thermal resistance (θJA = 108.2°C/W) and compact PCB footprint. |
Pinout & Package
The AD7938BSUZ-REEL7 is housed in a 32-lead LFCSP (CP-32-7) package with exposed pad connected to AGND/DGND. Pin functions are validated per Analog Devices Rev. F datasheet Figure 2 and Table 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DB0–DB11 | Parallel data I/O bus | Three-state outputs carrying 12-bit conversion result; logic levels referenced to VDRIVE, enabling mixed-voltage interfacing. |
| CONVST | Conversion start trigger | Falling-edge–sensitive input that initiates sampling and conversion simultaneously; supports precise timing control in synchronized systems. |
| BUSY | Conversion status indicator | Active-high open-drain output signaling conversion in progress; enables polling or interrupt-driven data capture without fixed delays. |
| VDRIVE | Digital interface supply | Independent logic supply pin allowing direct connection to 3 V or 5 V processors regardless of VDD, simplifying level-shifting requirements. |
| VREFIN/VREFOUT | Reference input/output | Provides 2.5 V internal reference or accepts external reference (0.1 V to VDD); decoupling to AGND required for optimal noise performance. |
| CLKIN | Master clock input | Drives internal SAR conversion cycle (13 clocks + t2); 25.5 MHz maximum enables full 1.5 MSPS throughput. |
| CS, RD, WR | Parallel interface controls | Standard microprocessor-compatible strobes for register access and data read/write; support both word and byte modes via W/B and HBEN. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel sequencer with software configuration | Reduces host processor overhead by automating multi-channel scan order and repetition without firmware intervention. |
| VDRIVE voltage independence | Enables seamless integration with 3 V or 5 V digital subsystems while maintaining analog supply optimization (e.g., 3.3 V VDD for low noise, 5 V VDRIVE for legacy MCU compatibility). |
| No pipeline delay | Delivers deterministic latency (fixed 13-clock + t2 conversion time), critical for closed-loop control and time-critical event capture. |
| Flexible analog input modes | Supports single-ended (0–VREF), pseudo-differential (VIN− biased within −0.3 V to +1.8 V), and fully differential (±VREF/2 around VCM) topologies for diverse sensor front-end architectures. |
| Full shutdown mode (2 µA) | Allows ultra-low-power sleep states in battery-operated DAQ systems, with wake-up via CONVST rising edge in autoshutdown mode. |
Applications
| Industrial Process Monitoring | Motor Control Feedback |
|---|---|
|
Use Scenario: Continuous acquisition of temperature, pressure, and flow sensor outputs in PLC analog input modules. IC Role / Device Role / Timing Role: 12-bit SAR ADC with 8-channel sequencer performs synchronized sampling across multiple sensors at 1.5 MSPS, feeding data to FPGA or ARM-based controller. Use Value: Eliminates external multiplexer and reference components, reducing BOM count and board area while maintaining ±1 LSB INL for calibration-grade accuracy. |
Use Scenario: Real-time sampling of phase currents and DC bus voltage in three-phase inverter drives. IC Role / Device Role / Timing Role: AD7938BSUZ-REEL7 captures current-sense amplifier outputs with precise timing alignment via CONVST, supporting field-oriented control algorithms. Use Value: 69 dB SINAD at 50 kHz ensures clean current reconstruction for torque ripple minimization; no pipeline delay enables sub-microsecond loop closure. |
| Power Quality Analyzers | Test & Measurement Equipment |
|
Use Scenario: Simultaneous voltage and current waveform capture for harmonic analysis and THD calculation in grid-tied inverters. IC Role / Device Role / Timing Role: Configured in pseudo-differential mode to reject common-mode noise on shunt-based current sensing, with sequencer cycling across 4 voltage and 4 current channels. Use Value: Channel-to-channel isolation of −85 dB prevents crosstalk between high- and low-side measurements, preserving spectral purity for IEEE 519-compliant analysis. |
Use Scenario: Modular data acquisition cards requiring high channel density and minimal latency in automated test systems. IC Role / Device Role / Timing Role: Parallel interface with RD/WR/CS enables burst reads at >1 MSPS into FIFO buffers, while VDRIVE decoupling simplifies integration with 3.3 V FPGA fabric. Use Value: 32-lead LFCSP package allows 8-channel per IC density on dense backplane cards; 6 mW power at 3 V extends thermal headroom in fanless enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7939BSUZ-REEL7 | 10-bit resolution, identical 8-channel sequencer, same package and pinout, lower power (6 mW at 3 V), reduced SINAD (61 dB min). | Lower accuracy requirement; suitable for cost-sensitive applications where 10-bit resolution suffices (e.g., basic condition monitoring). | Select AD7939BSUZ-REEL7 when system SNR budget permits reduced resolution and lower BOM cost is prioritized over 12-bit fidelity. |
| AD7606BSTZ | 16-bit resolution, parallel/serial interface, on-chip 2.5 V reference, but no VDRIVE pin; requires external level shifters for 3 V/5 V interfacing. | Higher precision needed (e.g., laboratory-grade DMMs); lacks VDRIVE flexibility but offers better DC accuracy (±0.5 LSB INL). | Choose AD7606BSTZ when absolute DC accuracy and higher resolution outweigh the need for VDRIVE independence and simplified digital interface design. |
Compared with AD7939BSUZ-REEL7, the AD7938BSUZ-REEL7 provides 2 additional bits of resolution and 8 dB higher SINAD at 50 kHz, justifying its use in noise-sensitive measurement chains; versus AD7606BSTZ, it trades resolution for lower latency, smaller footprint, and native mixed-voltage interface capability.
Availability
AD7938BSUZ-REEL7 is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, power quality analyzers, and test & measurement equipment requiring stable component supply and long-term production continuity.
Supply support for AD7938BSUZ-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 Norwood, MA, with R&D and manufacturing operations worldwide.
The AD7938 is part of Analog Devices' precision SAR ADC product line, designed specifically for high-speed, multi-channel data acquisition in industrial automation, energy metering, and instrumentation where low latency, configurability, and integrated reference stability are essential.
FAQ
What is the maximum throughput rate supported by the AD7938BSUZ-REEL7?
The AD7938BSUZ-REEL7 supports a maximum throughput rate of 1.5 MSPS under specified conditions (fCLKIN = 25.5 MHz, VDD = 2.7 V to 5.25 V). This rate is achieved with a fixed 13-clock-cycle conversion time plus t2 setup, delivering deterministic latency ideal for real-time control loops. Performance remains stable across the full −40°C to +85°C operating temperature range.
Does the AD7938BSUZ-REEL7 require an external reference voltage?
No, the AD7938BSUZ-REEL7 includes an accurate on-chip 2.5 V reference (±0.2% max at 25°C, 25 ppm/°C tempco) that can be used directly for analog-to-digital conversion. The VREFIN/VREFOUT pin may also be overdriven with an external reference (0.1 V to VDD), but this is optional-not required-for standard operation of the AD7938BSUZ-REEL7.
How does the VDRIVE pin function in the AD7938BSUZ-REEL7?
The VDRIVE pin sets the logic voltage level for the AD7938BSUZ-REEL7's parallel interface (DB0–DB11, CS, RD, WR, etc.), allowing independent operation from VDD. For example, VDD can be 3.3 V for analog performance while VDRIVE is 5 V to interface directly with legacy 5 V microcontrollers-eliminating external level shifters and simplifying system design for the AD7938BSUZ-REEL7.
Can the AD7938BSUZ-REEL7 operate in pseudo-differential mode?
Yes, the AD7938BSUZ-REEL7 supports pseudo-differential input mode, where VIN+ ranges from 0 to VREF (or 0 to 2×VREF depending on RANGE bit) and VIN− is biased between −0.3 V and +1.8 V (at VDD = 5 V). This mode is commonly used with single-supply op-amp front-ends driving shunt-based current sensors, and is configured via the on-chip control register of the AD7938BSUZ-REEL7.
What package type is used for the AD7938BSUZ-REEL7?
The AD7938BSUZ-REEL7 is packaged in a 32-lead LFCSP (Lead Frame Chip Scale Package), designated CP-32-7 in Analog Devices documentation. It measures 5 mm × 5 mm with 0.5 mm pitch and includes an exposed thermal pad that must be soldered to the PCB ground plane using multiple vias for optimal thermal performance and EMI suppression.
AD7938BSUZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 625k
- Number of Inputs:
- 4, 7, 8
- 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:
- 32-TQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7938BSUZ-REEL7 FAQ
1.How can I place an order for AD7938BSUZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7938BSUZ-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 AD7938BSUZ-REEL7 reliable?
The price and inventory of AD7938BSUZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7938BSUZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7938BSUZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7938BSUZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7938BSUZ-REEL7?
AD7938BSUZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7938BSUZ-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 AD7938BSUZ-REEL7?
For technical support, including AD7938BSUZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7938BSUZ-REEL7 requirements.
6.How does Aetrix verify that AD7938BSUZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7938BSUZ-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 AD7938BSUZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7938BSUZ-REEL7?
All AD7938BSUZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7938BSUZ-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 AD7938BSUZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7938BSUZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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