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Analog Devices Inc. AD7858LARZ-REEL
- Part No.:
- AD7858LARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7858LARZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,367
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Product details
Overview
AD7858LARZ-REEL from Analog Devices is a 12-bit, 100 kSPS successive approximation register (SAR) analog-to-digital converter optimized for low-power operation. It features eight single-ended or four pseudo-differential analog inputs, on-chip 2.5 V reference, system/self-calibration, and SPI/QSPI/µP-compatible serial interface. Designed for battery-powered instrumentation and portable medical devices operating from 3 V to 5.5 V supply.
For engineers reviewing the AD7858LARZ-REEL datasheet, AD7858LARZ-REEL pinout, AD7858LARZ-REEL application, or AD7858LARZ-REEL equivalent, key selection factors include its 4.5 mW typical power dissipation at 3 V, 12-bit DC accuracy (±1 LSB INL), 100 kSPS throughput, and support for automatic power-down after conversion in embedded data acquisition systems.
Technical Context
The AD7858LARZ-REEL implements a charge redistribution DAC architecture with integrated track-and-hold, calibrated internal reference, and flexible serial interface supporting Mode 2 (SPI-compatible) timing. Its calibration engine supports full self-calibration, system offset calibration, and system full-scale calibration via dedicated CAL pin or software control.
It operates with external clock input (CLKIN) at 1 MHz (–40°C to +85°C) or 1.8 MHz (0°C to +70°C), delivers 12-bit straight binary output, and accepts analog input ranges from 0 V to VREF (up to AVDD). Channel configuration, power management, and read/write addressing are controlled via a 14-bit write-only control register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with guaranteed no missing codes |
| Throughput Rate | 100 kSPS maximum - enables real-time sampling of audio-band and sensor signals |
| Power Dissipation | 4.5 mW typical at 3 V - supports extended battery life in portable systems |
| Integral Nonlinearity | ±1 LSB max - ensures monotonicity and precision across full scale |
| Input Channels | 8 single-ended or 4 pseudo-differential - configurable via control register |
| Reference | Internal 2.5 V REFOUT with ±20 ppm/°C tempco - eliminates need for external reference |
| Supply Range | 3.0 V to 5.5 V dual-supply (AVDD/DVDD) - compatible with common logic rails |
Pinout & Package
AD7858LARZ-REEL is housed in a 24-lead SOIC (R-24) package with 0.3-inch width and standard JEDEC outline. Pin assignments are fully defined per Analog Devices' official pin configuration diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start Input | Edge-triggered signal initiating track-to-hold transition and conversion sequence |
| BUSY | Conversion Status Output | Active-high open-drain indicator signaling active conversion or calibration |
| SLEEP | Low-Power Mode Control | Logic 0 powers down all circuitry including internal reference while retaining calibration data |
| REFIN/REFOUT | Reference I/O | Provides 2.5 V output or accepts external reference from 1.2 V to AVDD |
| AIN1–AIN8 | Analog Input Channels | Configurable as eight single-ended (vs. AGND) or four pseudo-differential pairs |
| CAL | Calibration Trigger | Rising-edge-initiated self-calibration; supports auto-cal on power-up with 10 nF capacitor |
| DIN/DOUT/SCLK/SYNC | Serial Interface | 16-bit SPI/QSPI/8051-compatible interface with frame-sync and bidirectional data capability |
| AVDD, DVDD, AGND, DGND | Power & Ground | Separate analog/digital supplies and grounds minimize noise coupling in mixed-signal operation |
Key Features
| Feature | Design Value |
|---|---|
| Autocalibration on power-up | Eliminates manual calibration step during system startup using on-chip CAL pin with 10 nF capacitor |
| Flexible power management | Three power-down modes (full/partial/external clock off) reduce IDD to as low as 5 µA |
| Pseudo-differential input architecture | Enables rejection of common-mode noise on selected channel pairs without external amplifiers |
| Wide reference voltage range | Accepts external references from 1.2 V to AVDD, enabling use with precision low-voltage references |
| System calibration support | Allows correction of external gain/offset errors via programmable calibration registers |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG waveform digitization in handheld patient monitors with multi-day battery life. IC Role / Device Role / Timing Role: Primary 12-bit ADC acquiring analog front-end signals at 100 kSPS with on-chip reference and calibration. Use Value: 4.5 mW power at 3 V extends runtime; 12-bit linearity ensures diagnostic-grade signal fidelity. | Use Scenario: Environmental sensor node recording temperature, humidity, and pressure over weeks on coin-cell power. IC Role / Device Role / Timing Role: Low-power SAR ADC performing periodic wake-up conversions with automatic sleep entry post-conversion. Use Value: Sleep mode current ≤5 µA minimizes quiescent drain; built-in calibration maintains accuracy across temperature swings. |
| Industrial Field Transmitters | Pen-Based Computing Interfaces |
Use Scenario: 4–20 mA loop-powered transmitter digitizing process sensor outputs in hazardous locations. IC Role / Device Role / Timing Role: Isolated ADC interface handling pseudo-differential inputs from bridge sensors with system-level offset correction. Use Value: System calibration registers compensate for sensor and conditioning amplifier drift; 0–VREF input range matches industrial signal levels. | Use Scenario: Digitizing analog pen-tip position and pressure signals in tablet PCs with stylus input. IC Role / Device Role / Timing Role: High-speed, low-latency ADC capturing rapid pen movement with minimal power consumption between strokes. Use Value: 500 ns track/hold acquisition enables accurate sampling of fast transients; SPI interface simplifies host microcontroller integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7476AARMZ-REEL | 12-bit, 1 MSPS, no internal reference, 3.6 mW at 3 V | Higher speed but requires external reference and lacks system calibration | Choose when throughput >100 kSPS is required and board space allows external reference design |
| ADS7822U | 12-bit, 200 kSPS, 2.7 V–5.25 V supply, 3.5 mW at 3 V, no internal reference | Faster than AD7858LARZ-REEL but lacks on-chip calibration and pseudo-differential mode | Prefer for cost-sensitive, high-volume portable systems where external calibration is acceptable |
Compared with AD7858LARZ-REEL, AD7476AARMZ-REEL offers higher speed but demands external reference and calibration infrastructure, while ADS7822U provides faster sampling but omits system-level calibration and pseudo-differential input flexibility-making AD7858LARZ-REEL optimal for precision, low-power, self-contained measurement nodes.
Availability
AD7858LARZ-REEL is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, industrial field transmitters, and pen-based computing interfaces requiring stable component supply and long-term production continuity.
Supply support for AD7858LARZ-REEL 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, headquartered in Norwood, MA.
The AD7858LARZ-REEL belongs to Analog Devices' precision SAR ADC product line, engineered for low-power, high-accuracy data acquisition in portable and battery-operated systems where calibration integrity and supply flexibility are critical.
FAQ
What is the maximum sampling rate supported by the AD7858LARZ-REEL?
The AD7858LARZ-REEL supports a maximum throughput rate of 100 kSPS. This is achieved with a 1 MHz master clock (CLKIN) over the full –40°C to +85°C temperature range, or 1.8 MHz CLKIN at 0°C to +70°C. Conversion time is fixed at 4.6 µs (18 clock cycles), and the device can sustain this rate continuously with proper serial interface timing management.
Does the AD7858LARZ-REEL include an internal voltage reference?
Yes, the AD7858LARZ-REEL integrates an internal 2.5 V reference accessible via the REFIN/REFOUT pin. It provides ±20 ppm/°C temperature coefficient and can serve as the ADC's reference source. The pin also accepts external references from 1.2 V to AVDD, allowing flexibility for higher-precision or lower-voltage applications without modifying the AD7858LARZ-REEL's core functionality.
How does the AD7858LARZ-REEL handle calibration?
The AD7858LARZ-REEL supports both self-calibration and system calibration. Self-calibration corrects internal offset and gain errors on power-up or via the CAL pin. System calibration compensates for external front-end errors using programmable calibration registers. Calibration spans are ±0.05 × VREF for offset and ±0.025 × VREF for gain, ensuring robust correction of real-world sensor signal chain inaccuracies.
What serial interface protocols does the AD7858LARZ-REEL support?
The AD7858LARZ-REEL supports SPI, QSPI, and 8051-compatible serial interfaces through its DIN/DOUT/SCLK/SYNC pins. It operates in Mode 2 (CPOL = 1, CPHA = 0), with frame-sync (SYNC) controlling read/write windows. All 16-bit transfers are MSB-first, and register addressing is handled via ADDR1/ADDR0 bits in write operations and RDSLT1/RDSLT0 bits in the control register for reads.
Is the AD7858LARZ-REEL pin-compatible with other members of the AD7858 family?
Yes, the AD7858LARZ-REEL shares identical pinout and package (24-lead SOIC) with AD7858AR, AD7858BR, AD7858LAN, and other R-24 and N-24 variants. Functionally, it differs primarily in maximum throughput (100 kSPS vs. 200 kSPS) and power consumption (4.5 mW vs. 12 mW at 3 V), but all share the same control register map, timing structure, and interface behavior-enabling drop-in replacement in designs where speed reduction is acceptable.
AD7858LARZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 4, 8
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- SPI
- 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:
- 3V ~ 5.5V
- Voltage - Supply, Digital:
- 3V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7858LARZ-REEL FAQ
1.How can I place an order for AD7858LARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7858LARZ-REEL 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 AD7858LARZ-REEL reliable?
The price and inventory of AD7858LARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7858LARZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7858LARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7858LARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7858LARZ-REEL?
AD7858LARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7858LARZ-REEL 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 AD7858LARZ-REEL?
For technical support, including AD7858LARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7858LARZ-REEL requirements.
6.How does Aetrix verify that AD7858LARZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7858LARZ-REEL 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 AD7858LARZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7858LARZ-REEL?
All AD7858LARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7858LARZ-REEL, 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 AD7858LARZ-REEL part is unused and in its original packaging.
Return procedure for AD7858LARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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