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Analog Devices Inc. AD7858ARZ-REEL
- Part No.:
- AD7858ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7858ARZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,739
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Product details
Overview
AD7858ARZ-REEL from Analog Devices is a 12-bit, 200 kSPS SAR analog-to-digital converter with eight single-ended or four pseudo-differential input channels, internal reference buffer, on-chip calibration logic, and SPI/QSPI/µP-compatible serial interface. It operates from a single 3 V to 5.5 V supply, consumes 12 mW at 3 V, and targets precision data acquisition in portable instrumentation and battery-powered control systems.
For engineers reviewing the AD7858ARZ-REEL datasheet, AD7858ARZ-REEL pinout, AD7858ARZ-REEL application, or AD7858ARZ-REEL equivalent, key selection criteria include its 200 kSPS throughput, ±1 LSB integral nonlinearity, 70 dB SNR at 10 kHz, flexible power-down modes (25 µW sleep), and support for system-level offset/gain calibration - all in a 24-lead SOIC package.
Technical Context
The AD7858ARZ-REEL implements a charge-redistribution SAR architecture with integrated track-and-hold (500 ns acquisition time), internal 2.5 V reference buffer, and programmable channel multiplexer. Its serial interface supports Mode 2 timing with SYNC framing, enabling read/write during conversion to sustain full 200 kSPS throughput.
Calibration is performed via dedicated CAL pin or software command, supporting self-calibration (12.5 ms typical at 4 MHz CLKIN) and system calibration with user-defined offset/gain spans (±0.05 × VREF and ±0.025 × VREF). Power management is controlled through PMGT1/PMGT0 bits in the 14-bit write-only control register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 2.44 mV step size with 2.5 V reference, sufficient for 0.025% full-scale accuracy in sensor signal chains. |
| Sampling Rate | 200 kSPS - enables real-time capture of signals up to 100 kHz Nyquist bandwidth without aliasing in control loop feedback paths. |
| Integral Nonlinearity | ±1 LSB max - ensures monotonicity and <0.025% end-point linearity error across temperature, critical for closed-loop position sensing. |
| SNR + Distortion | 70 dB min at 10 kHz - supports >11.5 effective number of bits (ENOB) for high-fidelity waveform digitization in medical PDA front-ends. |
| Supply Range | 3.0 V to 5.5 V - allows direct interfacing with both 3.3 V microcontrollers and legacy 5 V industrial logic without level-shifting. |
| Power Dissipation | 12 mW at 3 V - enables continuous operation in handheld devices with >10-hour battery life using two AA cells. |
| Reference Input | REFIN/REFOUT pin provides 2.5 V buffered output or accepts external 1.2 V–VDD reference - simplifies design by eliminating external reference ICs in space-constrained layouts. |
Pinout & Package
AD7858ARZ-REEL is housed in a 24-lead SOIC (R-24) package with 0.3-inch width, RoHS-compliant lead finish, and standard JEDEC MS-013AC footprint. Thermal resistance θJA = 75°C/W supports operation up to +85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start trigger | Rising-edge sensitive input that initiates T/H hold mode and conversion; tied to DVDD if unused to prevent floating. |
| BUSY | Conversion status indicator | Active-high open-drain output signaling active conversion or calibration; used to synchronize host µC reads. |
| SLEEP | Low-power mode control | Logic 0 powers down all circuitry including internal reference; retains calibration data for fast wake-up (<1 µs recovery). |
| REFIN/REFOUT | Reference voltage node | Provides 2.5 V buffered output or accepts external reference; requires 0.1 µF + 0.01 µF decoupling to AGND for stability. |
| AIN1–AIN8 | Analog input channels | Configurable as eight single-ended (vs. AGND) or four pseudo-differential pairs; input range 0 V to VREF, not rail-to-rail. |
| CAL | Calibration initiation | Pulled high internally; falling edge resets calibration logic, rising edge triggers self-calibration - supports auto-cal on power-up with 10 nF to DGND. |
| DIN/DOUT/SCLK/SYNC | Serial interface I/O | 4-wire SPI-compatible port with frame-sync (SYNC) and bidirectional DIN; supports 4 MHz SCLK for 200 kSPS sustained throughput. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip self-calibration | Completes full offset/gain calibration in 12.5 ms (4 MHz CLKIN); eliminates manual trimming and drift compensation in field-deployed instruments. |
| Flexible power management | Three low-power states: normal (12 mW), partial power-down (400 µA), and full sleep (5 µA with clock off) - extends battery life in portable modems. |
| Pseudo-differential input architecture | Four differential channel pairs reject common-mode noise up to 90 dB while maintaining single-ended layout simplicity and pin count. |
| System calibration support | Accepts user-provided external offset/gain errors within ±0.05 × VREF and ±0.025 × VREF spans - enables factory-trimmed sensor modules with guaranteed end-system accuracy. |
| Wide supply compatibility | Operates from 3.0 V to 5.5 V with consistent 70 dB SNR and ±1 LSB INL - simplifies BOM consolidation across 3.3 V and 5 V product families. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG waveform acquisition in handheld patient monitors with 24-hour battery life. IC Role / Device Role / Timing Role: Primary ADC digitizing eight electrode inputs at 200 kSPS with on-chip calibration to maintain baseline stability across temperature shifts. Use Value: Eliminates external reference and calibration DAC, reducing PCB area by 35% and enabling Class II medical device certification with documented INL drift <±0.5 LSB over –40°C to +85°C. | Use Scenario: Environmental sensor hub collecting temperature, humidity, and pressure data in remote field deployments. IC Role / Device Role / Timing Role: Low-power ADC sampling four pseudo-differential sensor bridges, entering 5 µA sleep between 1-second readings. Use Value: Achieves 5-year battery life on two AA cells by leveraging automatic power-down after conversion and 1.15 mW standby dissipation at 3 V. |
| Industrial PLC Analog Input Modules | High-Speed Modem Signal Conditioning |
Use Scenario: 8-channel isolated analog input card for DIN-rail mounted controllers monitoring motor currents and voltages. IC Role / Device Role / Timing Role: Precision ADC with system calibration capability compensating for isolation amplifier gain drift and RTD sensor nonlinearity. Use Value: Enables ±0.1% full-scale accuracy over 10-year product lifetime without field recalibration, verified via on-board CAL pin test sequences. | Use Scenario: Front-end digitization of IF signals in cable modem upstream receivers operating at 10–65 MHz. IC Role / Device Role / Timing Role: High-speed ADC capturing 10 kHz baseband tones with 70 dB SNR, synchronized to DSP via SYNC-framed serial interface. Use Value: Supports QAM-64 constellation fidelity by maintaining <–78 dB THD and >90 dB channel isolation between adjacent upstream channels. |
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 |
|---|---|---|---|
| AD7858BRZ-REEL | Same package and pinout; improved ±0.5 LSB INL (B-grade) and higher 71 dB SNR - achieved via tighter laser trimming and enhanced DAC matching. | Required for metrology-grade applications demanding <0.012% full-scale linearity error, such as calibration standards equipment. | Select AD7858BRZ-REEL when absolute accuracy outweighs cost sensitivity; AD7858ARZ-REEL remains optimal for general-purpose industrial data acquisition. |
| ADS7822U | 8-bit, 200 kSPS, SPI-only interface; no internal reference or calibration logic; consumes 3.5 mW at 3 V - lacks pseudo-differential mode and system calibration capability. | Suitable only for lower-resolution applications like basic motor speed feedback where ±0.4% full-scale error is acceptable. | Choose ADS7822U only for cost-driven, non-critical sensing; AD7858ARZ-REEL provides 4× resolution, calibration, and noise performance essential for medical and test equipment. |
Compared with AD7858BRZ-REEL, AD7858ARZ-REEL trades 0.5 LSB INL and 1 dB SNR for broader commercial temperature range qualification and lower unit cost, while ADS7822U offers no path to upgrade resolution or calibration - making AD7858ARZ-REEL the balanced choice for mid-tier precision systems requiring long-term stability without premium-grade specs.
Availability
AD7858ARZ-REEL is available at Aetrix Electronics and suitable for battery-powered medical instruments, industrial data loggers, PLC analog input modules, and high-speed modem signal conditioning requiring stable component supply across multi-year production cycles.
Supply support for AD7858ARZ-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, with design centers worldwide and ISO 9001-certified manufacturing.
The AD7858ARZ-REEL belongs to Analog Devices' precision SAR ADC product line, engineered for applications demanding high resolution, low power, and on-chip intelligence - particularly portable instrumentation, industrial process control, and communications infrastructure where calibration autonomy and supply flexibility are critical.
FAQ
What is the maximum sampling rate supported by the AD7858ARZ-REEL?
The AD7858ARZ-REEL supports a maximum sampling rate of 200 kSPS under specified conditions: AVDD = DVDD = 3.0 V to 5.5 V, fCLKIN = 4 MHz, and REFIN/REFOUT = 2.5 V external reference. This throughput is sustained using read/write-during-conversion timing (Interface Mode 2), requiring ≥400 ns acquisition time between BUSY falling edge and next CONVST rising edge.
Does the AD7858ARZ-REEL require an external reference voltage?
No, the AD7858ARZ-REEL does not require an external reference voltage. Its REFIN/REFOUT pin provides a buffered 2.5 V output usable as the ADC reference. However, it can also accept an external reference from 1.2 V to VDD, enabling flexible scaling for applications needing different input ranges - e.g., 0–3.3 V with a 3.3 V reference.
How does the calibration function work on the AD7858ARZ-REEL?
The AD7858ARZ-REEL supports both self-calibration and system calibration. Self-calibration corrects internal offset and gain errors automatically on power-up (via 10 nF capacitor on CAL pin) or triggered by a rising edge on CAL. System calibration allows users to apply known external offsets/gains within ±0.05 × VREF and ±0.025 × VREF spans, storing correction values in on-chip calibration registers for permanent compensation.
What power-saving modes are available on the AD7858ARZ-REEL?
The AD7858ARZ-REEL offers three power-saving modes controlled via PMGT1/PMGT0 bits in the control register: normal operation (12 mW at 3 V), partial power-down (400 µA with clock on), and full sleep (5 µA with clock off). In sleep mode, all circuitry including the internal reference is powered down, yet calibration data is retained for immediate resumption of accurate conversions upon wake-up.
Is the AD7858ARZ-REEL pin-compatible with other members of the AD7858 family?
Yes, the AD7858ARZ-REEL is pin-compatible with all variants in the AD7858/AD7858L family, including AD7858BRZ-REEL, AD7858LARZ-REEL, and AD7858LBRZ-REEL. All share identical 24-lead SOIC (R-24) pinout, register map, and interface protocol - allowing drop-in replacement for speed vs. power trade-offs (e.g., swapping AD7858ARZ-REEL for AD7858LARZ-REEL reduces throughput to 100 kSPS but cuts power to 6.85 mW).
AD7858ARZ-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):
- 200k
- 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:
- -
AD7858ARZ-REEL FAQ
1.How can I place an order for AD7858ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7858ARZ-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 AD7858ARZ-REEL reliable?
The price and inventory of AD7858ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7858ARZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7858ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7858ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7858ARZ-REEL?
AD7858ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7858ARZ-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 AD7858ARZ-REEL?
For technical support, including AD7858ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7858ARZ-REEL requirements.
6.How does Aetrix verify that AD7858ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7858ARZ-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 AD7858ARZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7858ARZ-REEL?
All AD7858ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7858ARZ-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 AD7858ARZ-REEL part is unused and in its original packaging.
Return procedure for AD7858ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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