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Analog Devices Inc. AD7858LBNZ
- Part No.:
- AD7858LBNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7858LBNZ.pdf
- Description:
- IC ADC 12BIT SAR 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,242
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Product details
Overview
AD7858LBNZ from Analog Devices is a 12-bit, 100 kSPS successive approximation register (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, and flexible serial interface compatible with SPI/QSPI/8051 protocols. Designed for medical instruments and portable instrumentation, it delivers ±1 LSB integral nonlinearity and 71 dB SNR at 10 kHz input.
For engineers reviewing the AD7858LBNZ datasheet, AD7858LBNZ pinout, AD7858LBNZ application, or AD7858LBNZ equivalent, key selection criteria include its 100 kSPS throughput, 4.5 mW typical power dissipation at 3 V, system/self-calibration capability, and 24-lead narrow-body SOIC package compatibility with legacy industrial layouts.
Technical Context
The AD7858LBNZ implements a charge redistribution DAC architecture with integrated track-and-hold, enabling 500 ns acquisition time and full-scale conversion in 10 µs (at 1 MHz CLKIN). Its analog front-end supports 0 V to VREF input range with ±1 µA leakage and 20 pF input capacitance, while internal calibration logic compensates for offset and gain drift over temperature.
Digital control is managed via a 16-bit serial interface with configurable read/write addressing (Control, ADC Output Data, Status, Calibration registers), frame-synced SCLK operation, and hardware-triggered conversion using CONVST or software-initiated mode. Power management includes three states: normal (4.5 mW), partial power-down (400 µA), and full sleep (5 µA with clock off).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR architecture ensures unambiguous 4096-level digitization with guaranteed no missing codes. |
| Throughput Rate | 100 kSPS maximum - enables real-time sampling of signals up to 40 kHz (Nyquist-limited) in portable data loggers. |
| Integral Nonlinearity | ±1 LSB max - maintains monotonicity and accuracy across full temperature range (–40°C to +85°C). |
| Power Dissipation | 4.5 mW typical at 3 V - supports >100-hour battery life in 3 V coin-cell–powered handheld devices. |
| Reference Voltage | 2.5 V internal reference (REFIN/REFOUT pin) - eliminates external reference component count and layout area. |
| Input Configuration | Eight single-ended or four pseudo-differential channels - allows flexible sensor interfacing without external multiplexers. |
| Serial Interface | SPI/QSPI/8051-compatible 16-bit protocol - simplifies integration with common microcontrollers and avoids custom driver development. |
Pinout & Package
AD7858LBNZ is housed in a 24-lead narrow-body SOIC package (package code R-24), 7.6 mm × 15.4 mm footprint, 1.27 mm pitch, RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CONVST | Convert Start Input | Edge-triggered control signal initiating track-to-hold transition and conversion sequence; tied high if unused. |
| 2 BUSY | Conversion Status Output | Active-high open-drain indicator signaling active conversion or calibration; used for handshaking with host processor. |
| 3 SLEEP | Low-Power Mode Control | Logic 0 disables all analog circuitry including internal reference, retaining calibration data; critical for duty-cycled sensing. |
| 4 REFIN/REFOUT | Reference I/O | Provides 2.5 V reference output or accepts external reference from 1.2 V to AVDD; requires CREF1/CREF2 decoupling caps. |
| 5 AVDD, 6 AGND | Analog Supply & Ground | Separate analog domain (3.0–5.5 V) with dedicated ground minimizes digital noise coupling into sensitive ADC core. |
| 7 CREF1, 8 CREF2 | Reference Decoupling Terminals | Connect 0.1 µF ceramic (CREF1) and 0.01 µF ceramic (CREF2) to AGND - essential for stable DAC charge redistribution. |
| 9–16 AIN1–AIN8 | Configurable Analog Inputs | Support eight single-ended (vs. AGND) or four pseudo-differential pairs; channel mapping set via control register bits. |
| 17 CAL | Calibration Trigger | Pull-up enabled input; falling edge initiates self-calibration; optional 10 nF capacitor to DGND enables auto-cal on power-up. |
| 18 DVDD, 19 DGND | Digital Supply & Ground | Independent 3.0–5.5 V digital rail with separate ground prevents supply bounce from corrupting serial interface timing. |
| 20 DOUT, 21 DIN | Serial Data I/O | 16-bit MSB-first bidirectional data path; DIN functions as input or I/O depending on interface mode selected in control register. |
| 22 CLKIN | Master Clock Input | Accepts 1 MHz (–40°C to +85°C) or 1.8 MHz (0°C to +70°C) clock - sets conversion time (10 µs/18 cycles) and calibration duration. |
| 23 SCLK, 24 SYNC | Serial Interface Timing | SCLK provides bit clock; SYNC frames each 16-bit transfer - enables deterministic timing for deterministic firmware design. |
Key Features
| Feature | Design Value |
|---|---|
| System and self-calibration | On-chip offset/gain correction eliminates need for external calibration hardware and reduces production test time by >30%. |
| Flexible power management | Three discrete power states (normal, partial, full sleep) allow dynamic current scaling from 4.5 mW to 5 µA - ideal for intermittent-sampling IoT nodes. |
| Wide reference voltage support | Operates with external references from 1.2 V to AVDD - enables direct interfacing with low-voltage sensors without level-shifting. |
| Pseudo-differential input architecture | Rejects common-mode noise up to –90 dB between channels - improves signal integrity in noisy industrial environments. |
| Autocalibration on power-up | Optional 10 nF capacitor on CAL pin triggers full self-calibration at startup - ensures first-conversion accuracy without host intervention. |
Applications
| Portable Medical Monitoring | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Continuous ECG waveform capture in handheld patient monitors with 24-hour battery life. IC Role / Device Role / Timing Role: Primary ADC digitizing amplified analog biosignals at 100 Hz–1 kHz rates with calibrated DC accuracy. Use Value: 4.5 mW power consumption at 3 V extends runtime; ±1 LSB INL ensures diagnostic-grade amplitude fidelity. |
Use Scenario: Environmental sensor node logging temperature, humidity, and pressure every 10 seconds over 6 months. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated only during measurement bursts, then entering full sleep mode. Use Value: 5 µA sleep current with clock disabled minimizes quiescent drain; on-chip calibration maintains long-term accuracy without field recalibration. |
| Industrial Field Transmitters | Pen-Based Human Interface Devices |
|
Use Scenario: 4–20 mA loop-powered transmitter converting RTD or thermocouple outputs in hazardous locations. IC Role / Device Role / Timing Role: Isolated analog front-end ADC with pseudo-differential inputs rejecting ground-loop noise. Use Value: –90 dB channel-to-channel isolation prevents crosstalk between multiple sensor inputs; 0–VREF input range matches standard industrial signal levels. |
Use Scenario: Digitizing stylus position and pressure in pen computers with touch-sensitive LCD displays. IC Role / Device Role / Timing Role: High-speed sampling of resistive touchscreen voltages with minimal latency for responsive user interaction. Use Value: 10 µs conversion time enables >90 Hz coordinate update rate; SPI-compatible interface simplifies connection to ARM-based application processors. |
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 |
|---|---|---|---|
| AD7858BN | Same architecture and pinout, but rated for ±0.5 LSB INL (B grade) and 200 kSPS speed; consumes 6.85 mW at 3 V. | Targeted at higher-accuracy, higher-throughput instrumentation where power budget allows. | Select AD7858BN when system requires tighter linearity and faster sampling, accepting higher power draw. |
| ADS7822U | 12-bit, 200 kSPS SAR ADC in 8-pin SOIC; uses external reference, no on-chip calibration; 2.7 mW at 3 V. | Used in space-constrained designs where calibration is handled externally or not required. | Choose ADS7822U for ultra-low-power, minimal-footprint applications lacking calibration requirements and needing smaller package. |
Compared with AD7858BN, AD7858LBNZ trades speed and precision for lower power and built-in calibration; versus ADS7822U, it adds reference and calibration circuitry at the cost of larger SOIC-24 footprint and higher current draw - making AD7858LBNZ optimal for mid-complexity portable systems requiring turnkey accuracy.
Availability
AD7858LBNZ is available at Aetrix Electronics and suitable for portable medical monitoring, battery-powered data loggers, industrial field transmitters, and pen-based human interface devices requiring stable component supply across extended product lifecycles.
Supply support for AD7858LBNZ 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 precision instrumentation, industrial automation, and healthcare markets since 1965.
The AD7858LBNZ belongs to Analog Devices' legacy SAR ADC product line designed specifically for low-power, high-accuracy data acquisition in portable and embedded systems - emphasizing integrated calibration, flexible power modes, and robust serial interfacing.
FAQ
What is the maximum sampling rate supported by the AD7858LBNZ?
The AD7858LBNZ supports a maximum throughput rate of 100 kSPS under specified conditions (1 MHz CLKIN, –40°C to +85°C). This is achieved with a 10 µs conversion time, enabling accurate digitization of signals up to 40 kHz bandwidth. The part's timing is fully characterized for this rate in the official datasheet Rev. B, and performance remains stable across its full operating temperature range.
Does the AD7858LBNZ require external calibration components?
No, the AD7858LBNZ does not require external calibration components. It integrates both self-calibration and system calibration circuitry, with on-chip memory storing calibration coefficients. A 10 nF capacitor on the CAL pin enables automatic self-calibration at power-up, and manual calibration can be triggered via the CAL input or control register - eliminating need for external trim pots or calibration DACs.
Can the AD7858LBNZ operate with a 2.5 V external reference instead of the internal one?
Yes, the AD7858LBNZ can operate with a 2.5 V external reference applied to the REFIN/REFOUT pin. The device is specified to function with reference voltages from 1.2 V to AVDD, and the 2.5 V external source replaces the internal reference. When using an external reference, CREF1 and CREF2 capacitors remain required for stability, and the part retains full 12-bit performance and calibration functionality.
What package type is used for the AD7858LBNZ?
The AD7858LBNZ uses a 24-lead narrow-body SOIC package (package code R-24), measuring 7.6 mm × 15.4 mm with 1.27 mm lead pitch. This package is pin-compatible with other AD7858/AD7858L variants in SOIC and supports standard reflow soldering profiles. It is distinct from the DIP (N-24) and SSOP (RS-24) variants and is RoHS-compliant.
How does the SLEEP pin function in low-power operation of the AD7858LBNZ?
The SLEEP pin on the AD7858LBNZ controls entry into low-power mode: a logic low disables all analog circuitry - including the internal reference, track-and-hold, and DAC - reducing current to 5 µA (with clock off) while retaining calibration data. A logic high restores full operation. This pin enables precise power gating synchronized with system activity, making AD7858LBNZ suitable for duty-cycled sensor nodes.
AD7858LBNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7858LBNZ FAQ
1.How can I place an order for AD7858LBNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7858LBNZ 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 AD7858LBNZ reliable?
The price and inventory of AD7858LBNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7858LBNZ is usually 5 days.
3.What payment methods are accepted for AD7858LBNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7858LBNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7858LBNZ?
AD7858LBNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7858LBNZ 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 AD7858LBNZ?
For technical support, including AD7858LBNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7858LBNZ requirements.
6.How does Aetrix verify that AD7858LBNZ is sourced from the original manufacturer or authorized distributors?
All AD7858LBNZ 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 AD7858LBNZ meets industry standards.
7.What is the process for return or replacement of AD7858LBNZ?
All AD7858LBNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7858LBNZ, 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 AD7858LBNZ part is unused and in its original packaging.
Return procedure for AD7858LBNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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