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Analog Devices Inc. AD7854LARSZ-REEL
- Part No.:
- AD7854LARSZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD7854LARSZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,749
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Product details
Overview
AD7854LARSZ-REEL from Analog Devices is a 12-bit, 100 kSPS pseudo-differential successive-approximation ADC operating from a single 3 V to 5.5 V supply. It features on-chip 2.5 V reference, system/self-calibration, flexible parallel interface (12-bit or byte-mode), and automatic power-down consuming just 650 µW at 10 kSPS - optimized for battery-powered instrumentation and portable medical devices.
For engineers reviewing the AD7854LARSZ-REEL datasheet, AD7854LARSZ-REEL pinout, AD7854LARSZ-REEL application, or AD7854LARSZ-REEL equivalent, key selection criteria include unipolar/bipolar input range support (0–VREF or ±VREF/2), guaranteed no-missed-codes performance, integral nonlinearity ≤±1 LSB, and SSOP-28 package compatibility with space-constrained embedded data acquisition systems.
Technical Context
The AD7854LARSZ-REEL integrates a track-and-hold amplifier with 500 ns acquisition time, SAR ADC core, internal charge redistribution DAC, and calibration logic supporting both self- and system-level offset/gain correction. Its control register enables software-controlled conversion start, power management (PMGT1/PMGT0), analog mode selection (AMODE), and calibration sequencing via CALSLT/STCAL bits.
It uses a 1.8 MHz master clock (CLKIN) for timing-critical operations including conversion (18 × tCLKIN = 10 µs max), full self-calibration (31.25 ms typ), and system offset calibration (3.47 ms typ). The parallel interface supports 12-bit read/write via DB0–DB11 with HBEN-controlled byte alignment and CS/RD/WR handshaking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.024% of full-scale range with guaranteed no-missed-codes performance. |
| Sampling Rate | 100 kSPS - fixed maximum throughput for AD7854L variant; supports real-time signal capture in portable modems and sensor interfaces. |
| Power Dissipation | 5.5 mW at 3 V (normal mode); 650 µW at 10 kSPS - enables >100-hour operation on coin-cell batteries in handheld instruments. |
| INL / DNL | ±1 LSB max INL; ±1 LSB max DNL - ensures monotonicity and predictable transfer function across temperature (–40°C to +85°C). |
| Input Range | Unipolar: 0 to VREF; Bipolar: –VREF/2 to +VREF/2 - configurable via AMODE bit for direct interfacing to transducer bridges or op-amp outputs. |
| Reference | Internal 2.5 V ±20 ppm/°C REFOUT; accepts external 1.2 V to AVDD - eliminates need for precision external reference in cost-sensitive designs. |
| SNR + THD | 70 dB min SNR + distortion at 10 kHz input - sufficient for 11.3 ENOB in audio-band and industrial sensor digitization. |
Pinout & Package
AD7854LARSZ-REEL is housed in a 28-lead SSOP (Shrink Small Outline Package) with 0.65 mm pitch, JEDEC MS-013AC compliant, footprint-compatible with SOIC-28 but 30% smaller area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start trigger | Rising-edge initiates T/H hold and conversion; can be hardware- or software-controlled (via CONVST bit in control register). |
| CLKIN | Master clock input | 1.8 MHz nominal (0°C to +70°C); sets conversion time (10 µs), calibration duration, and timing margins for all digital I/O. |
| BUSY | Conversion status output | Active-high open-drain signal indicates active conversion or calibration; used for polling or interrupt-driven read synchronization. |
| HBEN | High-byte enable | Selects 12-bit parallel (HBEN low) or byte-mode (HBEN high) operation - essential for 8-bit microcontroller bus interfacing. |
| REFIN/REFOUT | Reference I/O | Provides 2.5 V internal reference; accepts external reference up to AVDD - enables ratiometric or absolute measurement configurations. |
| AIN(+), AIN(–) | Pseudo-differential analog inputs | Support unipolar (0–VREF) or bipolar (±VREF/2) ranges; AIN(–) must be ≥ AGND and ≤ AVDD; AIN(+) constrained relative to AIN(–). |
| DB0–DB11 | 12-bit bidirectional data bus | Three-state outputs driven by CS/RD/WR/HBEN; outputs straight binary (unipolar) or two's complement (bipolar) coding. |
| CS, RD, WR | Parallel interface controls | Standard 8080-style bus protocol; RD/WR strobes sample data on rising edge; CS enables device during access cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | 3 V to 5.5 V AVDD/DVDD - eliminates dual-rail supplies and simplifies power architecture in portable systems. |
| On-chip calibration | Self-calibration (DAC/gain/offset) and system calibration (external gain/offset error correction) - maintains accuracy over temperature without factory recalibration. |
| Flexible power management | Three power-down modes (full/partial/sleep) controlled by PMGT1/PMGT0 - reduces idle current to 5 µA (clock off) for ultra-low-power wake-on-event designs. |
| Configurable analog input | Software-selectable unipolar (0–VREF) or bipolar (±VREF/2) range via AMODE bit - adapts to diverse sensor signal conditioning topologies. |
| SSOP-28 package | 5.6 mm × 10.2 mm body, 0.65 mm pitch - provides compact, thermally efficient layout for high-density PCBs while maintaining manufacturability. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Digitizing ECG, pulse oximetry, or glucose sensor outputs in handheld diagnostic tools. IC Role / Device Role / Timing Role: Primary 12-bit ADC capturing analog biosignals at ≤100 kSPS with low-noise, low-power, and calibrated accuracy. Use Value: Enables >100-hour battery life using CR2032 cells while maintaining ±1 LSB linearity over clinical temperature range (0°C to +40°C). |
Use Scenario: Continuous environmental monitoring (temperature, humidity, pressure) in remote field deployments. IC Role / Device Role / Timing Role: Low-duty-cycle ADC sampling sensors every 1–10 seconds, entering deep sleep between conversions. Use Value: Achieves sub-µA average current draw via automatic power-down, extending 2xAA battery life to >5 years. |
| Industrial Sensor Signal Conditioning | Pen-Based Computing Interfaces |
Use Scenario: Converting 4–20 mA loop signals or bridge transducer outputs in PLC I/O modules. IC Role / Device Role / Timing Role: Precision ADC with system calibration capability to compensate for sensor offset/gain drift and PCB trace resistance. Use Value: Eliminates manual potentiometer trimming; supports field recalibration via microcontroller-initiated system calibration sequence. |
Use Scenario: Sampling stylus position and pressure in pen computers and signature pads. IC Role / Device Role / Timing Role: High-speed 12-bit ADC acquiring analog pen signals with <500 ns track/hold acquisition for accurate stroke reconstruction. Use Value: Captures fine handwriting details at 100 kSPS while maintaining low latency and minimal power consumption during active use. |
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 |
|---|---|---|---|
| AD7854ARZ | Same pinout and register map, but rated for 200 kSPS and 15 mW normal power - higher speed, higher current. | Preferred where throughput >100 kSPS is required; unsuitable for ultra-low-power battery operation. | Select AD7854ARZ only if system demands >100 kSPS and can accommodate 3× higher active power. |
| ADS7822U | 12-bit, 200 kSPS, SPI interface, 3.3 V only, 2.5 mW typical - serial interface, no internal reference, different calibration model. | Used in space-constrained designs where SPI bus saves pins; requires external reference and lacks system calibration support. | Choose ADS7822U when board layout favors serial interface and external reference is already present; not drop-in compatible. |
Compared with AD7854LARSZ-REEL, AD7854ARZ offers higher speed at significantly increased power, while ADS7822U trades parallel simplicity for serial flexibility and lower integration - making AD7854LARSZ-REEL optimal for low-power, self-contained, parallel-bus ADC needs in portable instrumentation.
Availability
AD7854LARSZ-REEL is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, industrial sensor signal conditioning, and pen-based computing interfaces requiring stable component supply and long-term production continuity.
Supply support for AD7854LARSZ-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 AD7854LARSZ-REEL belongs to Analog Devices' precision SAR ADC product line, designed specifically for low-power, high-accuracy data acquisition in portable and embedded systems where size, energy efficiency, and calibration integrity are critical.
FAQ
What is the maximum sampling rate of the AD7854LARSZ-REEL?
The AD7854LARSZ-REEL is specified for a maximum sampling rate of 100 kSPS, achieved with a 1.8 MHz master clock (CLKIN) and 18-clock conversion cycle. This is a fixed limit for the AD7854L variant - unlike the AD7854, which supports 200 kSPS. The 100 kSPS rate ensures consistent low-power operation and thermal stability in battery-powered applications where the AD7854LARSZ-REEL is typically deployed.
Does the AD7854LARSZ-REEL require an external reference voltage?
No, the AD7854LARSZ-REEL includes an internal 2.5 V reference with ±20 ppm/°C temperature coefficient, accessible via the REFIN/REFOUT pin. It can operate in standalone mode using this internal reference, or accept an external reference from 1.2 V to AVDD applied to the same pin - enabling ratiometric measurements or improved accuracy when a higher-precision external source is available. The AD7854LARSZ-REEL does not require external reference components for basic operation.
How is the analog input range configured on the AD7854LARSZ-REEL?
The AD7854LARSZ-REEL supports two analog input ranges selected via the AMODE bit in its control register: unipolar (0 to VREF) when AMODE = 0, and bipolar (–VREF/2 to +VREF/2) when AMODE = 1. In unipolar mode, AIN(+) must remain ≥ AIN(–); in bipolar mode, AIN(–) must be biased to at least +VREF/2 to ensure AIN(+) stays within AGND–AVDD limits. Coding is straight binary (unipolar) or two's complement (bipolar), and both modes are fully supported by on-chip calibration.
What power-down modes does the AD7854LARSZ-REEL support?
The AD7854LARSZ-REEL supports three programmable power-down modes controlled by PMGT1 and PMGT0 bits: full power-down (10 µA typ with clock off), partial power-down (200 µA typ with clock off), and sleep mode (400 µA typ with clock on). All modes retain register contents and resume operation without reinitialization. Power-down is automatically triggered after each conversion unless disabled, enabling ultra-low average current in intermittent-sampling applications - a key feature distinguishing the AD7854LARSZ-REEL from higher-power variants.
Is the AD7854LARSZ-REEL pin-compatible with other AD7854 family members?
Yes, the AD7854LARSZ-REEL is pin-compatible with all AD7854/AD7854L variants in the same SSOP-28 package (e.g., AD7854LARSZ, AD7854LARS-REEL), sharing identical pinout, register map, and interface timing. However, it is not pin-compatible with SOIC-28 or Cerdip-28 versions due to differing package footprints. Electrical differences - notably 100 kSPS vs. 200 kSPS and 5.5 mW vs. 15 mW power - require firmware and power design review when substituting across speed grades, even with matching packages.
AD7854LARSZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-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:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI
- Configuration:
- 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:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7854LARSZ-REEL FAQ
1.How can I place an order for AD7854LARSZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7854LARSZ-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 AD7854LARSZ-REEL reliable?
The price and inventory of AD7854LARSZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7854LARSZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7854LARSZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7854LARSZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7854LARSZ-REEL?
AD7854LARSZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7854LARSZ-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 AD7854LARSZ-REEL?
For technical support, including AD7854LARSZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7854LARSZ-REEL requirements.
6.How does Aetrix verify that AD7854LARSZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7854LARSZ-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 AD7854LARSZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7854LARSZ-REEL?
All AD7854LARSZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7854LARSZ-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 AD7854LARSZ-REEL part is unused and in its original packaging.
Return procedure for AD7854LARSZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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