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Analog Devices Inc. AD7938BSUZ-6REEL7
- Part No.:
- AD7938BSUZ-6REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-TQFP
- Datasheet:
-
AD7938BSUZ-6REEL7.pdf
- Description:
- IC ADC 12BIT SAR 32TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,166
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Product details
Overview
AD7938BSUZ-6REEL7 from Analog Devices is a 12-bit, 8-channel, 625 kSPS 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 features parallel word/byte interface with no pipeline delay-enabling real-time data acquisition in multichannel industrial sensor monitoring systems.
For engineers reviewing the AD7938BSUZ-6REEL7 datasheet, AD7938BSUZ-6REEL7 pinout, AD7938BSUZ-6REEL7 application, or AD7938BSUZ-6REEL7 equivalent, key selection considerations include its 69 dB SINAD at 50 kHz, ±1 LSB INL (differential mode), 32-lead TQFP package, VDRIVE-independent logic interface, and software-configurable input sequencing for deterministic multi-sensor sampling.
Technical Context
The AD7938BSUZ-6REEL7 implements a wide-bandwidth differential track-and-hold amplifier capable of handling analog inputs up to 50 MHz, paired with a 12-bit SAR core requiring exactly 13 CLKIN cycles per conversion. Its internal sequencer supports preprogrammed channel scans across all eight VINx inputs without host intervention, while the control register enables runtime reconfiguration of input range (0–VREF or 0–2×VREF), output coding (straight binary or twos complement), and power modes (normal, autostandby, full shutdown).
Conversion is triggered by a falling edge on CONVST, with BUSY asserted high until result latching; data is read via CS/RD-controlled parallel bus with configurable 12-bit word or 8-bit byte transfer using W/B and DB8/HBEN. The VDRIVE pin decouples digital I/O voltage (2.7 V–5.25 V) from analog supply (VDD), allowing direct interfacing to 3 V or 5 V microprocessors independent of VDD level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for precise amplitude quantization in sensor and instrumentation applications. |
| Throughput Rate | 625 kSPS maximum - supports high-speed continuous sampling of up to 8 channels with sequencer-driven round-robin acquisition. |
| SINAD | 69 dB min at 50 kHz (differential mode) - ensures ≥11.2 effective bits for clean signal reconstruction in noise-sensitive measurement systems. |
| INL | ±1 LSB max (differential mode) - guarantees monotonicity and linearity critical for closed-loop control feedback paths. |
| On-chip Reference | 2.5 V ±0.2% at 25°C, 25 ppm/°C - eliminates external reference component count while maintaining system-level accuracy over temperature. |
| Power Dissipation | 3.6 mW max at 625 kSPS with 3 V supplies - enables low-power operation in battery-backed or thermally constrained embedded systems. |
| Channel Count | 8 analog inputs with hardware sequencer - reduces host CPU overhead and timing jitter in synchronized multi-sensor data logging. |
Pinout & Package
AD7938BSUZ-6REEL7 is housed in a 32-lead TQFP (SU-32-2) package with exposed pad, optimized for thermal performance and PCB layout simplicity in industrial signal chains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DB0–DB7 | Data Bits 0–7 | Three-state parallel I/O for 8-bit byte transfers; logic levels referenced to VDRIVE, enabling mixed-voltage system interfacing. |
| DB8/HBEN | Data Bit 8 / High-Byte Enable | Configurable function: acts as DB8 in word mode; controls high-byte access (DB0–DB3) and provides channel ID bits (DB4–DB6) during reads in byte mode. |
| DB9–DB11 | Data Bits 9–11 | Complete 12-bit word transfer capability when W/B = high; essential for full-resolution data capture without byte-splitting overhead. |
| CONVST | Conversion Start | Falling-edge-triggered sample initiation; synchronizes track-to-hold transition and starts 13-cycle SAR conversion sequence. |
| BUSY | Busy Indicator | Active-high open-drain output signaling conversion progress; allows polling or interrupt-driven result retrieval with precise timing control. |
| VREFIN/VREFOUT | Reference Input/Output | Provides 2.5 V internal reference; can be overdriven with external reference (0.1 V to VDD) for enhanced accuracy or custom input ranges. |
| VDRIVE | Digital I/O Supply | Decouples logic interface voltage from VDD; supports 3 V or 5 V processor interfacing regardless of analog supply rail (2.7 V–5.25 V). |
| VIN0–VIN7 | Analog Inputs | Eight multiplexed inputs configurable as single-ended, pseudo-differential (4 or 7 channels), or fully differential (4 pairs) via control register. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Runtime selection among 8× single-ended, 4× fully differential, or 4/7× pseudo-differential modes via MODE bits-adapts to diverse sensor outputs without hardware change. |
| No pipeline delay | Deterministic 13-clock-cycle conversion latency enables precise time-critical sampling in servo control and real-time monitoring loops. |
| VDRIVE-independent interface | Parallel bus operates at VDRIVE voltage (2.7 V–5.25 V), independent of VDD-simplifies interconnect to heterogeneous processor families without level shifters. |
| Autostandby power management | Reduces IDD to 160 μA typ at 100 kSPS, balancing responsiveness and energy efficiency in duty-cycled data acquisition systems. |
| Accurate on-chip 2.5 V reference | ±0.2% initial error and 25 ppm/°C drift support stable absolute measurements without external reference calibration or trimming. |
Applications
| Industrial Process Monitoring | Automotive Battery Management Systems |
|---|---|
|
Use Scenario: Continuous voltage, current, and temperature sensing across multiple cells or process nodes in PLC-based control cabinets. IC Role / Device Role / Timing Role: 8-channel SAR ADC with sequencer performs synchronized sampling of analog sensor outputs at 625 kSPS, feeding data to FPGA or ARM Cortex-M host. Use Value: Eliminates need for external multiplexer and reference, reduces BOM count by 3 components, and maintains ±1 LSB INL across −40°C to +85°C operating range. |
Use Scenario: Cell voltage and pack current monitoring in 12–48 V EV battery packs with thermal runaway detection requirements. IC Role / Device Role / Timing Role: High-accuracy ADC digitizes isolated shunt/sense resistor signals and cell taps, with sequencer ensuring consistent inter-channel timing for SoC estimation. Use Value: 69 dB SINAD at 50 kHz preserves resolution for ripple analysis; 2.5 V reference stability minimizes calibration drift over vehicle lifetime. |
| Medical Patient Monitoring Equipment | Test & Measurement Data Loggers |
|
Use Scenario: Multi-parameter vital sign acquisition (ECG, SpO₂, respiration) in portable bedside monitors requiring low power and high fidelity. IC Role / Device Role / Timing Role: Low-noise 12-bit ADC captures biopotential signals with programmable gain and input configuration, interfaced directly to 3.3 V MCU via parallel bus. Use Value: 3.6 mW power at 3 V enables >8-hour battery life; channel-to-channel isolation >85 dB prevents crosstalk between ECG and respiration channels. |
Use Scenario: Portable field data logger capturing vibration, pressure, and environmental sensor data across 8 channels with timestamped sequences. IC Role / Device Role / Timing Role: Sequenced 8-channel ADC feeds burst-mode samples to microSD via DMA, leveraging W/B and HBEN for efficient 12-bit word packing. Use Value: Full shutdown mode draws ≤2 μA, extending idle battery life; 50 MHz full-power bandwidth supports anti-aliasing filter design for broadband signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7934-6BCPZ-RL7 | 4-channel variant in 32-lead LFCSP; identical 625 kSPS rate, same reference and sequencer architecture but half the input count. | Suitable where board space or channel density is constrained and only four sensors require simultaneous monitoring. | Select AD7934-6BCPZ-RL7 when reducing channel count justifies LFCSP thermal advantages and smaller footprint over TQFP. |
| AD7938-6BCPZ-RL7 | Same electrical specs and pinout as AD7938BSUZ-6REEL7 but in 32-lead LFCSP (CP-32-7); differs only in package type and RoHS compliance marking. | Preferred for high-density, thermally demanding layouts where exposed-pad thermal dissipation is prioritized over TQFP manufacturability. | Choose AD7938-6BCPZ-RL7 for improved θJA (108.2°C/W vs. 121°C/W) in compact industrial modules; otherwise AD7938BSUZ-6REEL7 offers standard TQFP assembly compatibility. |
Compared with AD7934-6BCPZ-RL7, AD7938BSUZ-6REEL7 doubles channel count at identical speed and accuracy-critical for sensor-rich systems-while AD7938-6BCPZ-RL7 trades package form factor for marginally better thermal performance without functional change.
Availability
AD7938BSUZ-6REEL7 is available at Aetrix Electronics and suitable for industrial process monitoring, automotive battery management systems, and portable medical instrumentation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AD7938BSUZ-6REEL7 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, serving precision instrumentation, industrial automation, and communications markets since 1965.
The AD7938 family was designed specifically for high-speed, multichannel data acquisition in space- and power-constrained embedded systems-emphasizing integration (on-chip reference, sequencer), flexibility (input configuration, VDRIVE), and deterministic timing (no pipeline delay).
FAQ
What is the maximum sampling rate supported by the AD7938BSUZ-6REEL7?
The AD7938BSUZ-6REEL7 supports a maximum throughput rate of 625 kSPS under specified conditions (fCLKIN = 10 MHz, VDD = 2.7 V–5.25 V). This rate is achieved with a fixed 13-clock-cycle conversion time, meaning actual sampling frequency depends on CLKIN frequency and sequencing overhead. At 625 kSPS, the device completes one full 12-bit conversion every 1.6 μs, enabling real-time capture of fast-changing analog signals in industrial and test equipment applications. The AD7938BSUZ-6REEL7 maintains this rate across its full operating temperature range (−40°C to +85°C).
Does the AD7938BSUZ-6REEL7 require an external reference voltage?
No, the AD7938BSUZ-6REEL7 includes an accurate on-chip 2.5 V reference with ±0.2% initial error at 25°C and 25 ppm/°C temperature coefficient, sufficient for most precision measurement applications. However, the VREFIN/VREFOUT pin can be overdriven with an external reference (0.1 V to VDD) to improve absolute accuracy, extend input range, or support custom scaling-making the AD7938BSUZ-6REEL7 flexible for both cost-sensitive and high-accuracy designs without hardware modification.
How does the channel sequencer in the AD7938BSUZ-6REEL7 operate?
The AD7938BSUZ-6REEL7's hardware sequencer enables autonomous, preprogrammed scanning of up to eight analog inputs (VIN0–VIN7) without host processor intervention. Configuration is done via the SEQ and SHDW bits in the control register, allowing users to define scan order, repeat behavior, and channel enable/disable states. Once initiated, the sequencer cycles through selected channels on each CONVST trigger, delivering results with deterministic timing-reducing software overhead and jitter in multichannel data loggers and sensor fusion systems using the AD7938BSUZ-6REEL7.
What are the supported analog input configurations for the AD7938BSUZ-6REEL7?
The AD7938BSUZ-6REEL7 supports three analog input topologies selectable via the MODE bits in its control register: (1) 8-channel single-ended (VINx to AGND), (2) 4-channel fully differential (VINx+/VINx− pairs), and (3) 4- or 7-channel pseudo-differential (VINx+ to shared VINx−). Input range is software-configurable as 0–VREF or 0–2×VREF, and output coding supports straight binary or twos complement. This configurability allows the AD7938BSUZ-6REEL7 to interface directly with diverse sensors-including RTDs, strain gauges, and isolated current shunts-without external signal conditioning.
What is the purpose of the VDRIVE pin on the AD7938BSUZ-6REEL7?
The VDRIVE pin on the AD7938BSUZ-6REEL7 sets the logic voltage level for the parallel interface (DB0–DB11, RD, WR, CS, etc.), decoupling it from the analog supply VDD. This allows the AD7938BSUZ-6REEL7 to connect directly to 3 V or 5 V microprocessors-even when VDD is set to a different voltage (2.7 V–5.25 V)-eliminating level-shifting circuitry. VDRIVE must remain within −0.3 V to VDD + 0.3 V, and proper decoupling to DGND is required. This feature simplifies system integration and improves noise immunity in mixed-supply embedded designs using the AD7938BSUZ-6REEL7.
AD7938BSUZ-6REEL7 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-6REEL7 FAQ
1.How can I place an order for AD7938BSUZ-6REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7938BSUZ-6REEL7 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-6REEL7 reliable?
The price and inventory of AD7938BSUZ-6REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7938BSUZ-6REEL7 is usually 5 days.
3.What payment methods are accepted for AD7938BSUZ-6REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7938BSUZ-6REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7938BSUZ-6REEL7?
AD7938BSUZ-6REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7938BSUZ-6REEL7 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-6REEL7?
For technical support, including AD7938BSUZ-6REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7938BSUZ-6REEL7 requirements.
6.How does Aetrix verify that AD7938BSUZ-6REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7938BSUZ-6REEL7 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-6REEL7 meets industry standards.
7.What is the process for return or replacement of AD7938BSUZ-6REEL7?
All AD7938BSUZ-6REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7938BSUZ-6REEL7, 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-6REEL7 part is unused and in its original packaging.
Return procedure for AD7938BSUZ-6REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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