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Analog Devices Inc. AD7291TCPZ-EP-RL7
- Part No.:
- AD7291TCPZ-EP-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-WFQFN Exposed Pad, CSP
- Datasheet:
-
AD7291TCPZ-EP-RL7.pdf
- Description:
- IC ADC 12BIT SAR 20LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,917
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Product details
Overview
AD7291TCPZ-EP-RL7 from Analog Devices is a 12-bit, 8-channel SAR ADC with integrated temperature sensor, operating from 2.8 V to 3.6 V VDD and supporting I²C interface up to 400 kHz. It delivers 22.22 kSPS throughput, ±1°C typical temperature accuracy, and 71 dB SINAD at 1 kHz, used in precision environmental monitoring and industrial sensor nodes.
For engineers reviewing the AD7291TCPZ-EP-RL7 datasheet, AD7291TCPZ-EP-RL7 pinout, AD7291TCPZ-EP-RL7 application, or AD7291TCPZ-EP-RL7 equivalent, key selection criteria include its −55°C to +125°C extended temperature range, internal 2.5 V reference, autocycle mode, ALERT out-of-range indicator, and LFCSP-20 package compatibility with high-density PCB layouts.
Technical Context
The AD7291TCPZ-EP-RL7 integrates an 8-channel analog multiplexer, track-and-hold amplifier (30 MHz full-power bandwidth), and 12-bit SAR core with on-chip 2.5 V reference. Its I²C interface supports standard (100 kHz) and fast (400 kHz) modes, enabling direct connection to microcontrollers without level-shifting.
It features programmable channel sequencing, dual limit registers for high/low thresholds, and ALERT output that functions as a hardware interrupt. The internal band gap temperature sensor digitizes to 0.25°C resolution and is calibrated across −55°C to +125°C, with ±1°C typical accuracy at −55°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR architecture ensures 4096 discrete digital codes for precise analog signal digitization. |
| Analog Input Range | 0 V to 2.5 V single-ended input range compatible with common sensor output levels and internal reference. |
| Temperature Accuracy | ±1°C typical over −55°C to +85°C enables reliable thermal monitoring without external calibration. |
| I²C Interface Speed | Supports 400 kHz fast-mode operation, allowing 50 µs autocycle update rate and efficient host polling. |
| Power Consumption | 3.5 mA typical normal-mode current and 13 µA max full power-down current support battery-powered systems. |
| Operating Temperature | −55°C to +125°C extended industrial range meets defense/aerospace AQEC qualification requirements. |
| Reference | Internal 2.5 V ±0.3% reference eliminates need for external voltage reference in most applications. |
Pinout & Package
AD7291TCPZ-EP-RL7 uses a 20-lead LFCSP package (CP-20-8), 4 mm × 4 mm body, 0.75 mm height, with exposed thermal pad requiring soldering to PCB ground for thermal performance and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN0–VIN7 | Analog Inputs | Eight single-ended channels accepting 0 V to 2.5 V signals; unused inputs must be tied to GND1 to prevent noise coupling. |
| GND1 | Analog Reference Ground | Separate ground for internal reference and analog inputs; must be decoupled to VREF via 10 µF capacitor and kept within 0.3 V of other grounds. |
| VREF | Reference I/O | Provides buffered 2.5 V internal reference; accepts 2.0 V–2.5 V external reference when internal reference is disabled. |
| DCAP | LDO Decoupling | Connects 1 µF capacitor to stabilize internal low-dropout regulator powering analog circuitry. |
| VDD | Main Supply | 2.8 V–3.6 V supply requiring 10 µF + 100 nF decoupling to GND for noise immunity and stable conversion. |
| AS0, AS1 | I²C Address Select | Two logic inputs setting unique 7-bit I²C slave address; voltage levels determine device address per AD7291 data sheet. |
| ALERT | Digital Output | Open-drain interrupt output active-low when conversion result exceeds programmed DATAHIGH/DATALOW limits. |
| SDA, SCL | I²C Bus | Open-drain bidirectional data and clock lines requiring external pull-up resistors; compatible with 100/400 kHz modes. |
| VDRIVE | Logic Interface Supply | 1.65 V–3.6 V logic-level reference; sets input/output voltage thresholds and must not exceed VDD by >0.3 V. |
| PD/RST | Control Input | Active-low pin entering full power-down mode or performing sub-100 ns reset; analog inputs must be at 0 V during power-down. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Temperature Sensor | High-accuracy band gap sensor digitized by same 12-bit ADC core, delivering 0.25°C resolution and ±1°C typical error across full −55°C to +125°C range. |
| Programmable Channel Sequencer | Enables automatic cycling through user-defined subset of 8 analog inputs without host intervention, reducing firmware overhead in multi-sensor systems. |
| Out-of-Range Alert Function | Dedicated ALERT pin asserts hardware interrupt when any channel or temperature reading breaches programmable high/low thresholds stored in DATALOW/DATAHIGH registers. |
| Autocycle Mode | Self-timed conversion sequence triggered by software enable, achieving 50 µs update interval and eliminating need for continuous I²C polling. |
| Low-Power Operation | 13 µA maximum full power-down current and 3.5 mA typical operational current support energy-constrained applications including remote sensors and space-constrained modules. |
Applications
| Industrial Process Monitoring | Aerospace Vehicle Health Management |
|---|---|
Use Scenario: Real-time acquisition of pressure, flow, and temperature signals from multiple transducers in chemical plant control cabinets. IC Role / Device Role / Timing Role: Simultaneous 8-channel analog sensing and on-chip thermal monitoring with I²C readout for PLC or RTU integration. Use Value: Eliminates external temperature sensor and reference IC, reducing BOM count while maintaining ±1°C thermal accuracy over −55°C to +125°C ambient. | Use Scenario: Distributed thermal and voltage monitoring across avionics bays, engine compartments, and power distribution units in UAVs and satellites. IC Role / Device Role / Timing Role: Radiation-tolerant, AQEC-qualified ADC providing fault-detectable temperature and analog status with ALERT-driven interrupt signaling. Use Value: Extended temperature range and controlled manufacturing baseline ensure reliability in mission-critical environments where field failure is unacceptable. |
| Defense System Environmental Sensors | High-Density Test Equipment Front-End |
Use Scenario: Embedded condition monitoring in ruggedized handheld radios, electronic warfare pods, and vehicle-mounted C4I systems deployed in desert or arctic conditions. IC Role / Device Role / Timing Role: Single-chip solution for analog signal conditioning and thermal self-check, interfacing directly to ARM-based secure processors via I²C. Use Value: LFCSP-20 package enables compact layout; 20-lead footprint supports high channel density without sacrificing thermal performance or EMI integrity. | Use Scenario: Multi-point voltage and temperature sampling in automated test equipment (ATE) fixtures verifying power supply rails and thermal margins on ASIC evaluation boards. IC Role / Device Role / Timing Role: High-throughput 22.22 kSPS ADC with autocycle mode enabling rapid sweep across 8 DUT measurement points per cycle. Use Value: 71 dB SINAD and 30 MHz full-power bandwidth preserve signal fidelity for accurate DC and low-frequency AC measurements under noisy lab conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel ADC with temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7298BCPZ-RL7 | 8-channel, 12-bit SAR ADC with internal temperature sensor but no internal reference; requires external 2.5 V reference. | Designed for lower-cost, reference-flexible systems where external reference already exists; lacks ALERT output and autocycle mode. | Select AD7298BCPZ-RL7 only if external reference is available and interrupt-driven thermal alerting is unnecessary. |
| ADS7957IRHBR | 8-channel, 12-bit SAR ADC with SPI interface, no integrated temperature sensor, and 2.5 V internal reference. | Targets high-speed industrial PLCs using SPI bus; requires separate temperature IC and adds component count and layout complexity. | Choose ADS7957IRHBR when SPI interface is mandatory and thermal sensing is handled externally with higher accuracy requirements. |
Compared with AD7291TCPZ-EP-RL7, AD7298BCPZ-RL7 trades ALERT functionality and internal reference for cost reduction, while ADS7957IRHBR replaces I²C simplicity with SPI speed but removes integrated thermal sensing-making AD7291TCPZ-EP-RL7 optimal for compact, interrupt-driven, thermally aware embedded systems.
Availability
AD7291TCPZ-EP-RL7 is available at Aetrix Electronics and suitable for industrial process monitoring, aerospace vehicle health management, defense system environmental sensors, and high-density test equipment front-end applications requiring stable component supply across extended temperature ranges.
Supply support for AD7291TCPZ-EP-RL7 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and defense markets since 1965.
The AD7291-EP product line delivers radiation-tolerant, AQEC-qualified data converters for mission-critical aerospace and defense applications demanding −55°C to +125°C operation and controlled manufacturing baselines.
FAQ
What is the operating temperature range of the AD7291TCPZ-EP-RL7?
The AD7291TCPZ-EP-RL7 operates across −55°C to +125°C, meeting enhanced product requirements for defense and aerospace applications. This extended range is validated per AQEC standards and supported by controlled manufacturing, single-fab/site traceability, and qualification data available upon request. The internal temperature sensor maintains ±1°C typical accuracy within −55°C to +85°C.
Does the AD7291TCPZ-EP-RL7 require an external reference voltage?
No, the AD7291TCPZ-EP-RL7 includes an internal 2.5 V reference with ±0.3% accuracy at 25°C, accessible at the VREF pin. It can be disabled to accept an external reference between 2.0 V and 2.5 V. The internal reference eliminates BOM cost and board space in most applications, and its 12 ppm/°C temperature coefficient ensures stability across the full operating range.
How does the ALERT pin function on the AD7291TCPZ-EP-RL7?
The ALERT pin on the AD7291TCPZ-EP-RL7 is an open-drain output that asserts low when any conversion result-whether from VIN0–VIN7 or the internal temperature sensor-exceeds user-programmed high or low thresholds stored in the DATALOW and DATAHIGH registers. It serves as a hardware interrupt to offload polling from the host MCU and is fully functional in both command and autocycle modes.
What package type and mounting requirements apply to the AD7291TCPZ-EP-RL7?
The AD7291TCPZ-EP-RL7 uses a 20-lead LFCSP (CP-20-8), 4 mm × 4 mm body with 0.75 mm height and exposed thermal pad. The EPAD must be soldered to PCB ground for thermal dissipation, EMI suppression, and electrical performance. Per Analog Devices' recommendation, this pad connects to a solid ground plane using ≥9 thermal vias.
Can the AD7291TCPZ-EP-RL7 operate with different logic voltage levels than its analog supply?
Yes, the AD7291TCPZ-EP-RL7 supports independent logic and analog supplies via VDRIVE (1.65 V to 3.6 V) and VDD (2.8 V to 3.6 V). VDRIVE sets I²C input thresholds and output drive levels, enabling interoperability with 1.8 V or 3.3 V microcontrollers even when VDD is at 3.3 V. VDRIVE must never exceed VDD by more than 0.3 V to avoid damage.
AD7291TCPZ-EP-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 22.22k
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- I2C
- 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:
- 2.8V ~ 3.6V
- Voltage - Supply, Digital:
- 2.8V ~ 3.6V
- Features:
- Temperature Sensor
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Supplier Device Package:
- 20-LFCSP (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7291TCPZ-EP-RL7 FAQ
1.How can I place an order for AD7291TCPZ-EP-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7291TCPZ-EP-RL7 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 AD7291TCPZ-EP-RL7 reliable?
The price and inventory of AD7291TCPZ-EP-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7291TCPZ-EP-RL7 is usually 5 days.
3.What payment methods are accepted for AD7291TCPZ-EP-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7291TCPZ-EP-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7291TCPZ-EP-RL7?
AD7291TCPZ-EP-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7291TCPZ-EP-RL7 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 AD7291TCPZ-EP-RL7?
For technical support, including AD7291TCPZ-EP-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7291TCPZ-EP-RL7 requirements.
6.How does Aetrix verify that AD7291TCPZ-EP-RL7 is sourced from the original manufacturer or authorized distributors?
All AD7291TCPZ-EP-RL7 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 AD7291TCPZ-EP-RL7 meets industry standards.
7.What is the process for return or replacement of AD7291TCPZ-EP-RL7?
All AD7291TCPZ-EP-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7291TCPZ-EP-RL7, 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 AD7291TCPZ-EP-RL7 part is unused and in its original packaging.
Return procedure for AD7291TCPZ-EP-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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