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Analog Devices Inc. AD7738BRUZ
- Part No.:
- AD7738BRUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7738BRUZ.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:300
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Product details
Overview
AD7738BRUZ from Analog Devices is a high-precision, 8-channel, 24-bit sigma-delta analog-to-digital converter optimized for industrial multiplexed signal acquisition. It delivers true 16-bit peak-to-peak resolution at 8.5 kHz channel switching (117 µs conversion time), ±0.0015% integral nonlinearity, and supports configurable unipolar/bipolar input ranges up to ±2.5 V. It is used in programmable logic controllers (PLCs) for simultaneous high-fidelity sensor monitoring across multiple channels.
For engineers reviewing the AD7738BRUZ datasheet, AD7738BRUZ pinout, AD7738BRUZ application, or AD7738BRUZ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated package and pin functions, confirmed alternative options, and supply-ready availability details - all grounded in the official AD7738 Rev. 0 datasheet and Analog Devices product documentation.
Technical Context
The AD7738BRUZ implements a chopping-enabled sigma-delta ADC architecture with on-chip per-channel system calibration, enabling stable offset and gain error correction across temperature. Its multiplexer output (MUXOUT±) is externally accessible, allowing external programmable gain or signal conditioning before the ADC input stage.
It features dual-supply operation (5 V AVDD, 3 V or 5 V DVDD), Schmitt-triggered digital interface inputs, and differential reference input with "No-Reference" detect capability. The device operates over –40°C to +105°C and supports SPI/QSPI/MICROWIRE-compatible 3-wire serial communication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no-missing-codes; 18-bit p-p at 500 Hz (enables stable low-noise measurement in slow-scan applications) |
| Conversion Rate | Up to 15.4 kHz (chopping disabled); 8.5 kHz at 16-bit p-p resolution (supports fast channel cycling in DCS systems) |
| INL Error | ±0.0015% FSR (guaranteed linearity over full scale ensures accurate multi-sensor scaling without per-channel linearization) |
| Input Configuration | 8 single-ended or 4 fully differential channels; selectable ±2.5 V / ±1.25 V / ±625 mV ranges (flexible sensor interfacing without external level-shifting) |
| Reference Input | Differential REFIN± accepts 2.475–2.525 V; includes NOREF detection (enables robust open-reference fault handling in field wiring) |
| Power Supply | 5 V AVDD, 2.7–3.6 V or 4.75–5.25 V DVDD; 16 mA AVDD current in normal mode (compatible with isolated industrial power rails) |
| Operating Temp | –40°C to +105°C (qualified for extended industrial environments including cabinet-mounted PLC I/O modules) |
Pinout & Package
AD7738BRUZ is housed in a 28-lead TSSOP (RU-28) package with exposed pad for thermal performance in high-density industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered; synchronizes all serial data transfers - enables noise-immune communication in electrically noisy PLC cabinets |
| AIN0–AIN7 | Analog input terminals | Configurable as 8 single-ended or 4 differential pairs; common-mode range extends from 0.2 V above AGND to AVDD – 0.3 V (supports wide sensor common-mode swing) |
| AINCOM/P0 | Common analog reference / digital I/O | Configurable via P0 Dir bit; when used as AINCOM, sets reference level for single-ended channels (eliminates need for external reference buffer) |
| MUXOUT(±) | Multiplexer output | Externally accessible analog output of internal mux - allows insertion of external PGA or anti-alias filtering before ADCIN(±) |
| ADCIN(±) | ADC core input | Direct connection point to sigma-delta modulator; must be tied to MUXOUT(±) in standard configuration (ensures signal path integrity) |
| REFIN(±) | Differential reference input | Accepts 2.5 V reference with ±1% tolerance; NOREF bit flags loss of reference - critical for SIL-2/IEC 61508-compliant diagnostics |
| RDY | Ready status output | Falling edge signals valid data ready or calibration completion - enables interrupt-driven firmware polling without CPU overhead |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel system calibration | Enables independent zero-scale and full-scale calibration for each of 8 channels - eliminates inter-channel crosstalk-induced gain/offset drift in multiplexed systems |
| Chopping enable/disable | Switches between ultra-low-drift (chop enabled) and high-throughput (chop disabled) modes - adapts to dynamic measurement requirements without hardware change |
| Configurable input ranges | ±2.5 V, ±1.25 V, ±625 mV (unipolar/bipolar) - matches standard industrial sensor outputs (e.g., 4–20 mA with shunt, ±10 V transducers) without external scaling resistors |
| External MUXOUT access | Allows placement of external gain stages or filters between mux and ADC - preserves SNR while supporting custom signal conditioning per channel group |
| No-reference detection | Hardware-level flag (NOREF bit) triggers on reference loss - enables fail-safe shutdown or alarm in safety-critical process control loops |
Applications
| PLC Analog Input Module | Industrial Data Acquisition System |
|---|---|
|
Use Scenario: High-density 8-channel analog input card in modular PLC backplane, acquiring voltage/current signals from pressure, temperature, and flow sensors. IC Role / Device Role / Timing Role: Primary ADC front end; performs synchronized sampling, on-the-fly calibration, and serial data streaming to host controller via SPI. Use Value: 16-bit p-p resolution at 8.5 kHz enables sub-0.1% accuracy across 100+ sensor points per rack without oversampling firmware overhead. |
Use Scenario: Standalone DIN-rail mounted DAQ unit logging vibration, strain, and thermocouple data in predictive maintenance deployments. IC Role / Device Role / Timing Role: Precision analog acquisition engine; uses MUXOUT± to integrate external anti-alias filters and programmable gain before digitization. Use Value: Chopping-disabled mode delivers 15.4 kHz throughput with 15-bit p-p resolution - sufficient for 5 kHz mechanical resonance capture in rotating equipment. |
| Process Controller I/O Board | High-Accuracy Weigh Scale Interface |
|
Use Scenario: Embedded I/O board in distributed control system (DCS) node, interfacing with 4–20 mA transmitters and RTD conditioners. IC Role / Device Role / Timing Role: Signal conditioner and digitizer; leverages AINCOM/P0 for common-mode referencing and REFIN(±) NOREF for loop integrity monitoring. Use Value: ±0.0015% INL and on-chip calibration ensure <±1 LSB error over full temperature range - meets ISA-88 batch control repeatability requirements. |
Use Scenario: Load cell interface in Class III legal-for-trade weighing instruments requiring NTEP certification. IC Role / Device Role / Timing Role: High-stability ADC core; uses chopping-enabled mode for ultra-low offset drift (<±280 nV/°C) and 24-bit no-missing-codes linearity. Use Value: 18-bit p-p resolution at 500 Hz provides >100 dB dynamic range - satisfies OIML R76 resolution mandates for 10,000 division scales. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7734BRUZ | 4-channel version; identical architecture, same 24-bit resolution and calibration features but half the channel count | Used where space or cost constraints limit channel density; lacks MUXOUT pins - no external signal conditioning support | Select when only 4 analog inputs are required and board area is constrained; shares same register map and firmware compatibility |
| AD7732BRUZ | 2-channel fully differential front end; no single-ended mode; higher input overvoltage tolerance (±16.5 V) on adjacent channels | Targeted at high-voltage bipolar sensor interfaces (e.g., ±10 V position encoders) where channel isolation is critical | Choose for true bipolar ±10 V inputs with adjacent-channel fault immunity; not suitable for 8-channel multiplexing or single-ended configurations |
Compared with AD7738BRUZ, AD7734BRUZ reduces channel count by 50% while retaining identical precision and calibration capabilities, whereas AD7732BRUZ trades channel count and flexibility for enhanced ±10 V bipolar input robustness and adjacent-channel overvoltage protection - making each optimal for distinct industrial topology requirements.
Availability
AD7738BRUZ is available at Aetrix Electronics and suitable for PLC analog input modules, industrial data acquisition systems, and process controller I/O boards requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7738BRUZ 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 AD7738BRUZ belongs to Analog Devices' precision sigma-delta ADC family designed specifically for high-accuracy, multiplexed industrial measurement - emphasizing noise performance, channel-to-channel consistency, and embedded calibration for harsh operating environments.
FAQ
What is the maximum channel switching rate with 16-bit peak-to-peak resolution for AD7738BRUZ?
The AD7738BRUZ achieves 16-bit peak-to-peak resolution at an 8.5 kHz channel switching rate, corresponding to a total conversion time of 117 µs per channel. This is specified under chopping-disabled operation with a 6.144 MHz master clock and ±1.25 V input range. The AD7738BRUZ maintains this performance across its full –40°C to +105°C operating range without recalibration.
Does AD7738BRUZ support both single-ended and differential input configurations?
Yes, the AD7738BRUZ supports eight single-ended inputs (AIN0–AIN7 referenced to AINCOM/P0) or four fully differential pairs (AIN0–AIN1, AIN2–AIN3, AIN4–AIN5, AIN6–AIN7). Configuration is controlled via COM1/COM0 bits in the Channel Setup register. The AD7738BRUZ also allows mixed-mode use within the same acquisition sequence through independent channel setup registers.
How does the NOREF function work on AD7738BRUZ?
The AD7738BRUZ monitors the differential voltage across REFIN(+) and REFIN(–). When this voltage drops below 0.5 V, the NOREF bit (bit 5) in the Channel Status register is set to '1'. This flag is latched per channel and readable via serial interface - enabling firmware to trigger diagnostics or safe state transitions. The AD7738BRUZ does not halt conversion upon NOREF assertion but reports it transparently.
Can AD7738BRUZ operate with a 3 V digital supply while using 5 V analog supply?
Yes, the AD7738BRUZ supports independent analog and digital supplies: AVDD = 4.75–5.25 V and DVDD = 2.7–3.6 V (or 4.75–5.25 V). At 3 V DVDD, logic inputs require VINH ≥ 2.5 V and VINL ≤ 0.4 V; outputs deliver VOH = DVDD – 0.6 V and VOL = 0.4 V at 100 µA load. This dual-supply flexibility allows direct interfacing with 3 V microcontrollers in isolated industrial designs.
What is the purpose of the MUXOUT(±) pins on AD7738BRUZ?
The MUXOUT(±) pins provide direct access to the output of the internal analog multiplexer - before the signal reaches the ADC core. This allows designers to insert external circuitry such as programmable gain amplifiers, anti-alias filters, or isolation buffers. In standard operation, MUXOUT(±) is connected to ADCIN(±); the AD7738BRUZ requires no external components to function, but MUXOUT(±) enables advanced signal conditioning architectures.
AD7738BRUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 15.4k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V, 5V
- Features:
- True Bipolar
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 28-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7738BRUZ FAQ
1.How can I place an order for AD7738BRUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7738BRUZ 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 AD7738BRUZ reliable?
The price and inventory of AD7738BRUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7738BRUZ is usually 5 days.
3.What payment methods are accepted for AD7738BRUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7738BRUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7738BRUZ?
AD7738BRUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7738BRUZ 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 AD7738BRUZ?
For technical support, including AD7738BRUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7738BRUZ requirements.
6.How does Aetrix verify that AD7738BRUZ is sourced from the original manufacturer or authorized distributors?
All AD7738BRUZ 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 AD7738BRUZ meets industry standards.
7.What is the process for return or replacement of AD7738BRUZ?
All AD7738BRUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7738BRUZ, 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 AD7738BRUZ part is unused and in its original packaging.
Return procedure for AD7738BRUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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