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Analog Devices Inc. AD7854ARZ-REEL
- Part No.:
- AD7854ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7854ARZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,856
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Product details
Overview
AD7854ARZ-REEL from Analog Devices is a 12-bit, 200 kSPS sampling analog-to-digital converter (ADC) with pseudo-differential input, on-chip 2.5 V reference, and flexible parallel interface. It operates from a single 3 V to 5.5 V supply, delivers 70 dB SNR at 10 kHz input, supports unipolar (0 to VREF) and bipolar (±VREF/2) input ranges, and features self- and system-calibration for precision instrumentation applications.
For engineers reviewing the AD7854ARZ-REEL datasheet, AD7854ARZ-REEL pinout, AD7854ARZ-REEL application, or AD7854ARZ-REEL equivalent, this page provides verified technical context, real-world timing and power specifications, validated pin functions, confirmed calibration capabilities, and two rigorously cross-checked alternative parts for battery-powered data acquisition, portable medical devices, and industrial control systems.
Technical Context
The AD7854ARZ-REEL uses a charge redistribution SAR architecture with integrated track-and-hold (500 ns acquisition time), internal 2.5 V reference (20 ppm/°C tempco), and programmable analog input mode (unipolar/bipolar). Its conversion cycle is clocked by an external 4 MHz master clock (tCONVERT = 4.5 µs max), and it supports both hardware-triggered (CONVST) and software-controlled (CONVST bit in control register) conversions.
It implements a 14-bit write-only control register governing power management (PMGT1/PMGT0), read register selection (RDSLT1/RDSLT0), analog mode (AMODE), and calibration sequencing (CALMD/CALSLT1/CALSLT0/STCAL). Calibration includes full self-calibration (12.5 ms typ @ 4 MHz), system offset/gain calibration, and configurable DAC-based internal calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with guaranteed no missing codes |
| Throughput Rate | 200 kSPS maximum - enables real-time sampling of audio-band and control-loop signals |
| SNR + THD | 70 dB min at 10 kHz input - sufficient for 11.3 ENOB in precision sensor digitization |
| Input Range | 0 to VREF (unipolar) or ±VREF/2 (bipolar) - supports both single-ended referenced and differential-sense topologies |
| Power Dissipation | 15 mW typical at 3 V - enables operation in thermally constrained portable systems |
| Reference | Internal 2.5 V ±0.25 V REFOUT with 20 ppm/°C drift - eliminates need for external reference in cost-sensitive designs |
| Calibration | On-chip self-calibration and system calibration - maintains accuracy over temperature without host MCU intervention |
Pinout & Package
AD7854ARZ-REEL is housed in a 28-lead SOIC (R-28) package with 0.3-inch body width and standard JEDEC MS-013 footprint. Pin assignments are identical across DIP, SOIC, and SSOP variants per Analog Devices' pin configuration diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CONVST | Convert Start Input | Edge-triggered start signal; falling edge initiates track-to-hold transition and conversion sequence |
| 4 CS | Chip Select Input | Active-low enable for parallel bus access; required for all register reads/writes |
| 11 AIN(–) | Analog Negative Input | Bias point for pseudo-differential input; must be ≥ AGND and ≤ AVDD; sets common-mode level for bipolar mode |
| 12 HBEN | High-Byte Enable | Selects byte-aligned 12-bit data transfer on DB0–DB11; enables compatibility with 8-bit and 16-bit microcontroller buses |
| 14 BUSY | Conversion Status Output | Active-high open-drain flag indicating active conversion or calibration; used for polling or interrupt-driven firmware |
| 22 DVDD | Digital Supply | Separate 3 V to 5.5 V rail for digital logic and interface; decoupling required near pin |
| 27 CLKIN | Master Clock Input | 4 MHz CMOS-compatible clock source; determines conversion time (18 × tCLKIN) and calibration duration |
Key Features
| Feature | Design Value |
|---|---|
| Single 3 V to 5.5 V supply operation | Eliminates dual-rail design complexity and reduces BOM count in portable and industrial systems |
| Programmable power-down modes | Reduces idle current to 5 µA (clock off) or 10 µA (clock on), extending battery life in intermittent-sampling applications |
| Flexible parallel interface | Supports 12-bit parallel reads via HBEN-controlled byte alignment - compatible with legacy 8-bit MCUs and modern 16-bit processors |
| On-chip 2.5 V reference with REFOUT | Provides stable, low-drift reference without external components; REFIN/REFOUT pin allows overdrive or bypass |
| Self- and system-calibration engine | Corrects gain/offset errors in-circuit using internal DAC and user-supplied reference points - improves long-term measurement stability |
Applications
| Battery-Powered Data Loggers | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: Continuous 10 kHz sampling of ECG or pulse oximetry analog front-end outputs in handheld diagnostic devices. IC Role / Device Role / Timing Role: Primary high-speed, low-power ADC capturing biopotential signals with calibrated DC accuracy and minimal thermal drift. Use Value: 70 dB SNR and ±1 LSB INL ensure clinical-grade waveform fidelity; 15 mW power enables >8-hour runtime on coin-cell batteries. |
Use Scenario: Digitizing transducer outputs (pressure, temperature, flow) in portable infusion pumps and ventilators. IC Role / Device Role / Timing Role: Precision analog front-end digitizer with system calibration support to maintain accuracy across operating temperature range (–40°C to +85°C). Use Value: On-chip self-calibration compensates for sensor drift and PCB thermal gradients; unipolar/bipolar mode accommodates diverse sensor output polarities. |
| Industrial Process Monitoring | High-Speed Modem Analog Front-End |
|
Use Scenario: Real-time monitoring of motor current, voltage, and temperature in embedded PLC I/O modules. IC Role / Device Role / Timing Role: Isolated analog input channel ADC interfacing to isolated amplifiers and multiplexers in noisy factory environments. Use Value: Pseudo-differential input rejects common-mode noise; 200 kSPS throughput captures transient fault events; robust 3 V–5.5 V supply tolerance simplifies field power design. |
Use Scenario: Sampling baseband analog signals in DSL or cable modem line cards before digital filtering and demodulation. IC Role / Device Role / Timing Role: High-fidelity signal capture stage with low THD (–78 dB) and fast acquisition (500 ns) to preserve modulation integrity. Use Value: 70 dB SNR + THD meets ITU-T G.992.1 spectral mask requirements; parallel interface enables direct connection to DSP memory-mapped I/O. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, parallel-interface ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7854LAR3 | 100 kSPS max, 5.5 mW at 3 V, 1.8 MHz CLKIN - lower speed and power than AD7854ARZ-REEL | Targeted for ultra-low-power, slower-sampling applications where 200 kSPS is unnecessary | Select when average throughput ≤50 kSPS and sleep-mode current <10 µA is critical |
| ADS7822U | 12-bit, 200 kSPS, SPI interface, 2.7–5.25 V supply, no internal reference - requires external REF and serial controller | Suited for space-constrained PCBs where serial interface reduces trace count vs. parallel bus | Choose when board layout favors serial communication and external reference is already present |
Compared with AD7854LAR3 and ADS7822U, AD7854ARZ-REEL uniquely combines 200 kSPS parallel throughput, integrated 2.5 V reference, and self-calibration in a single SOIC package - making it optimal for designs requiring plug-and-play precision without firmware overhead or layout compromises.
Availability
AD7854ARZ-REEL is available at Aetrix Electronics and suitable for battery-powered medical instruments, industrial process monitors, portable data loggers, and high-speed modem analog front-ends requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for AD7854ARZ-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 AD7854ARZ-REEL belongs to Analog Devices' precision data acquisition ADC product line, engineered for applications demanding calibrated accuracy, low power, and robust operation in portable and harsh-environment systems.
FAQ
What is the maximum sampling rate supported by the AD7854ARZ-REEL?
The AD7854ARZ-REEL supports a maximum throughput rate of 200 kSPS when operated with a 4 MHz master clock (CLKIN). Conversion time is fixed at 18 clock cycles, resulting in 4.5 µs typical conversion latency. This rate is specified across the full operating temperature range (–40°C to +85°C) and applies only to the AD7854 variant - not the lower-speed AD7854L series.
Does the AD7854ARZ-REEL include an internal voltage reference?
Yes, the AD7854ARZ-REEL integrates a 2.5 V bandgap reference with ±0.25 V initial tolerance and 20 ppm/°C typical temperature coefficient. The REFIN/REFOUT pin provides this reference voltage and can be overdriven by an external source up to AVDD. When used internally, it directly supplies the ADC core and DAC, eliminating the need for external reference components in most applications.
How does the AD7854ARZ-REEL handle analog input polarity selection?
The AD7854ARZ-REEL supports both unipolar (0 to VREF) and bipolar (±VREF/2) input ranges via the AMODE bit in its control register. In unipolar mode (AMODE = 0), AIN(+) must remain ≥ AIN(–); in bipolar mode (AMODE = 1), AIN(–) must be biased to +VREF/2, allowing AIN(+) to swing symmetrically around that point. Coding is straight binary (unipolar) or twos complement (bipolar).
Can the AD7854ARZ-REEL perform calibration without external components?
Yes, the AD7854ARZ-REEL supports full self-calibration using its internal DAC and on-chip logic - requiring no external voltage sources or precision resistors. System calibration is also supported but requires user-provided reference points at AIN(+) and AIN(–). Both calibration types are initiated via the control register's CALMD and STCAL bits and complete in under 13 ms at 4 MHz CLKIN.
What package type is used for the AD7854ARZ-REEL?
The AD7854ARZ-REEL is supplied in a 28-lead small outline integrated circuit (SOIC) package, designated R-28 per Analog Devices' ordering guide. It features a 0.3-inch body width, standard JEDEC MS-013 dimensions, and is RoHS-compliant and lead-free. The "-REEL" suffix indicates tape-and-reel packaging for automated assembly.
AD7854ARZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-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:
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7854ARZ-REEL FAQ
1.How can I place an order for AD7854ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7854ARZ-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 AD7854ARZ-REEL reliable?
The price and inventory of AD7854ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7854ARZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7854ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7854ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7854ARZ-REEL?
AD7854ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7854ARZ-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 AD7854ARZ-REEL?
For technical support, including AD7854ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7854ARZ-REEL requirements.
6.How does Aetrix verify that AD7854ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7854ARZ-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 AD7854ARZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7854ARZ-REEL?
All AD7854ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7854ARZ-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 AD7854ARZ-REEL part is unused and in its original packaging.
Return procedure for AD7854ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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