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Analog Devices Inc. AD7858LARSZ-REEL
- Part No.:
- AD7858LARSZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD7858LARSZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,325
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Product details
Overview
AD7858LARSZ-REEL from Analog Devices is a 12-bit, 100 kSPS SAR analog-to-digital converter optimized for low-power operation in battery-powered systems. It features eight single-ended or four pseudo-differential analog inputs, on-chip 2.5 V reference (REFIN/REFOUT), and flexible serial interface compatible with SPI/QSPI/8051 protocols. Its 4.5 mW typical power dissipation at 3 V enables use in portable medical instruments and PDA data acquisition.
For engineers reviewing the AD7858LARSZ-REEL datasheet, AD7858LARSZ-REEL pinout, AD7858LARSZ-REEL application, or AD7858LARSZ-REEL equivalent, key selection criteria include its guaranteed ±1 LSB integral nonlinearity at 3 V, 10 µs max conversion time, system/self-calibration capability, and SSOP-24 package compatibility with space-constrained embedded designs.
Technical Context
The AD7858LARSZ-REEL implements a charge redistribution DAC architecture with integrated track-and-hold, enabling 500 ns acquisition time and straight binary output coding. Its internal calibration memory retains offset/gain coefficients across power cycles, supporting both automatic power-up self-calibration and user-initiated system calibration via the CAL pin.
Serial communication uses a frame-synced 16-bit protocol with configurable read/write register addressing (Control, ADC Output Data, Status, Calibration). The device supports three power management states-normal, partial power-down (400 µA typ), and full power-down (5 µA max)-all controlled via PMGT bits in the Control Register and the SLEEP pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR architecture with guaranteed no missing codes |
| Throughput Rate | 100 kSPS maximum - sets real-time sampling limit for sensor monitoring at ≤10 µs per conversion |
| INL / DNL | ±1 LSB max integral nonlinearity; ±1 LSB max differential nonlinearity - ensures monotonicity and precision in closed-loop control |
| Power Dissipation | 4.5 mW typical at 3 V - enables >100-hour battery life in 3 V coin-cell–powered instrumentation |
| Analog Input Range | 0 V to VREF (1.2 V to AVDD) - supports direct interfacing with unbuffered sensors without level-shifting |
| Reference | Internal 2.5 V reference with 20 ppm/°C tempco - eliminates external reference component while maintaining <±3 LSB total unadjusted error over temperature |
| Supply Range | 3.0 V to 5.5 V dual-rail (AVDD/DVDD) - allows coexistence with 3.3 V logic and mixed-voltage signal chains |
Pinout & Package
AD7858LARSZ-REEL is housed in a 24-lead SSOP (Shrink Small Outline Package) with 0.635 mm lead pitch and 7.62 mm × 4.9 mm body size. This RoHS-compliant, surface-mount package supports automated assembly and provides thermal impedance of 115°C/W (θJA).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start input | Edge-triggered command initiating track-to-hold transition and conversion - enables precise timing control in synchronized data acquisition |
| BUSY | Conversion status output | Active-high open-drain signal indicating active conversion or calibration - used for interrupt-driven firmware polling or DMA triggering |
| SLEEP | Low-power mode control | Logic-low entry into full power-down state retaining calibration data - critical for duty-cycled sensor nodes |
| REFIN/REFOUT | Reference I/O terminal | Provides 2.5 V reference output or accepts external reference up to AVDD - simplifies design by eliminating dedicated reference IC |
| AIN1–AIN8 | Analog input channels | Configurable as eight single-ended (vs AGND) or four pseudo-differential pairs - supports multiplexed thermocouple, RTD, or voltage-sense inputs |
| CAL | Calibration initiation | Rising-edge triggered self-calibration start; pull-down capacitor enables auto-cal on power-up - ensures accuracy without host intervention |
| DIN/DOUT/SCLK/SYNC | Serial interface signals | 16-bit SPI-compatible port with frame sync - permits direct connection to microcontrollers without protocol translation logic |
Key Features
| Feature | Design Value |
|---|---|
| Autocalibration on power-up | Retains calibrated offset/gain coefficients in nonvolatile memory - eliminates factory calibration step during production test |
| Flexible power management | Three discrete power states (normal, partial, full down) controllable via SLEEP pin and Control Register - extends battery life in intermittent-sampling applications |
| Pseudo-differential input architecture | Four channel pairs with common-mode rejection >90 dB - improves noise immunity in industrial sensor front-ends |
| Wide reference range support | Accepts external references from 1.2 V to AVDD - enables high-resolution measurement of low-output transducers (e.g., 10 mV/V strain gauges) |
| System calibration capability | Supports user-defined gain/offset correction using external reference - compensates for sensor drift and PCB trace errors |
Applications
| Portable Medical Monitoring | Industrial Sensor Hub |
|---|---|
Use Scenario: Continuous acquisition of ECG, SpO₂, and temperature signals in handheld patient monitors powered by Li-ion batteries. IC Role / Device Role / Timing Role: Primary 12-bit ADC digitizing analog front-end outputs with 100 kSPS throughput and 500 ns acquisition window. Use Value: 4.5 mW power consumption at 3 V extends operational runtime beyond 8 hours per charge while maintaining ±1 LSB linearity for clinical-grade diagnostics. |
Use Scenario: Multi-sensor node aggregating pressure, humidity, and current measurements in factory automation gateways. IC Role / Device Role / Timing Role: Central SAR ADC managing eight analog inputs via software-configurable channel sequencing and on-demand calibration. Use Value: System calibration support compensates for long-term drift in analog conditioning circuits, ensuring ±0.1% FS accuracy over 10-year deployment. |
| Pen-Based Data Logging | Modem Analog Front-End |
Use Scenario: Digitizing handwriting pressure and tilt signals in stylus-enabled tablets with ultra-low standby current requirements. IC Role / Device Role / Timing Role: Low-power ADC entering full power-down (5 µA) between touch events, awakened by CONVST edge. Use Value: Full power-down mode with retained calibration data reduces average current to <10 µA, enabling multi-week idle battery life. |
Use Scenario: Sampling baseband audio and pilot tones in legacy DSL modems requiring SNR >70 dB at 10 kHz input. IC Role / Device Role / Timing Role: High-fidelity ADC providing 71 dB SNR + distortion performance with minimal THD (-78 dB) for analog line interface. Use Value: Guaranteed 71 dB dynamic performance at 100 kSPS ensures compliance with ITU-T G.992.1 Annex A spectral mask requirements. |
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 |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200 kSPS, SPI-only interface, no internal reference | Lacks calibration, lower resolution limits dynamic range in precision sensing | Select only when cost sensitivity outweighs resolution and reference integration needs |
| MAX11131ETE+ | 12-bit, 500 kSPS, internal 4.096 V reference, 10 µA sleep current | Higher speed and tighter tempco (5 ppm/°C), but requires 5 V supply and larger TQFN package | Prefer for high-speed industrial control where 5 V rails exist and board area permits TQFN-16 |
Compared with ADS7822U and MAX11131ETE+, AD7858LARSZ-REEL uniquely balances 12-bit precision, integrated 2.5 V reference, SSOP-24 footprint, and sub-5 mW 3 V operation-making it optimal for space- and energy-constrained portable instrumentation where calibration retention and pseudo-differential flexibility are required.
Availability
AD7858LARSZ-REEL is available at Aetrix Electronics and suitable for portable medical monitoring, industrial sensor hubs, pen-based data logging, and modem analog front-end applications requiring stable component supply across extended product lifecycles.
Supply support for AD7858LARSZ-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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7858LARSZ-REEL belongs to Analog Devices' precision SAR ADC product line, designed specifically for low-power, high-accuracy data acquisition in battery-operated and space-constrained embedded systems.
FAQ
What is the maximum conversion rate of the AD7858LARSZ-REEL?
The AD7858LARSZ-REEL achieves a maximum throughput rate of 100 kSPS, corresponding to a 10 µs conversion time under specified conditions (1 MHz CLKIN, –40°C to +85°C). This is confirmed in the datasheet's "CONVERSION RATE" section and distinguishes it from the faster AD7858 variant (200 kSPS). The AD7858LARSZ-REEL maintains this rate while consuming only 4.5 mW at 3 V, making it suitable for high-sample-rate, low-power applications.
Does the AD7858LARSZ-REEL include an internal voltage reference?
Yes, the AD7858LARSZ-REEL integrates a 2.5 V internal reference accessible via the REFIN/REFOUT pin, with 20 ppm/°C temperature coefficient and 2.3 V to 2.7 V output tolerance. It can also accept external references from 1.2 V to AVDD, providing design flexibility. This eliminates the need for an external reference IC in most applications, reducing BOM count and PCB area-key advantages confirmed in the "REFERENCE INPUT/OUTPUT" specifications table.
How does the AD7858LARSZ-REEL handle calibration?
The AD7858LARSZ-REEL supports both automatic self-calibration on power-up and user-initiated system calibration via the CAL pin. Its on-chip calibration memory retains offset and gain coefficients across power cycles. The datasheet specifies ±0.05 × VREF offset and ±0.025 × VREF full-scale calibration spans, enabling correction of sensor and signal-chain errors. This capability is implemented in hardware and requires no host processor overhead beyond issuing a CAL pulse.
What package type is used for the AD7858LARSZ-REEL?
The AD7858LARSZ-REEL is supplied in a 24-lead SSOP (Small Shrink Outline Package) with 0.635 mm lead pitch and 7.62 mm × 4.9 mm body dimensions. This RoHS-compliant, surface-mount package is explicitly listed in the Ordering Guide as "RS-24". It offers superior thermal performance (θJA = 115°C/W) and board density compared to SOIC or DIP variants, supporting automated reflow assembly in high-volume manufacturing.
Can the AD7858LARSZ-REEL operate from a 3 V supply?
Yes, the AD7858LARSZ-REEL is fully specified for operation from 3.0 V to 5.5 V on both AVDD and DVDD supplies. At 3 V, it delivers 4.5 mW typical power dissipation and maintains ±1 LSB integral nonlinearity-confirmed in the "POWER DISSIPATION" and "DC ACCURACY" tables. Its logic thresholds scale with supply voltage (e.g., VINH = 2.1 V min at 3.0–3.6 V), ensuring reliable interface with 3.3 V microcontrollers without level shifters.
AD7858LARSZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.209", 5.30mm 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-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7858LARSZ-REEL FAQ
1.How can I place an order for AD7858LARSZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7858LARSZ-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 AD7858LARSZ-REEL reliable?
The price and inventory of AD7858LARSZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7858LARSZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7858LARSZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7858LARSZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7858LARSZ-REEL?
AD7858LARSZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7858LARSZ-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 AD7858LARSZ-REEL?
For technical support, including AD7858LARSZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7858LARSZ-REEL requirements.
6.How does Aetrix verify that AD7858LARSZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7858LARSZ-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 AD7858LARSZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7858LARSZ-REEL?
All AD7858LARSZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7858LARSZ-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 AD7858LARSZ-REEL part is unused and in its original packaging.
Return procedure for AD7858LARSZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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