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Analog Devices Inc. AD7854ARZ
- Part No.:
- AD7854ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7854ARZ.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,189
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Product details
Overview
AD7854ARZ from Analog Devices is a 12-bit, 200 kSPS sampling analog-to-digital converter (ADC) with integrated track-and-hold, reference, and 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 on-chip self- and system calibration-enabling precision data acquisition in portable medical instruments and battery-powered instrumentation.
For engineers reviewing the AD7854ARZ datasheet, AD7854ARZ pinout, AD7854ARZ application, or AD7854ARZ equivalent, this page provides verified technical context, real-world timing and power specifications, validated pin functions, confirmed alternative parts for low-power or extended-temperature variants, and supply-chain support details for industrial embedded design and OEM production programs.
Technical Context
The AD7854ARZ uses a charge redistribution SAR architecture with a pseudo-differential input stage and internal 2.5 V reference. Its track-and-hold acquires signals in 500 ns and supports both software- and hardware-triggered conversions via CONVST or the control register's CONVST bit.
It implements a flexible 12-bit parallel interface with HBEN-controlled byte mode, configurable analog input range (AMODE bit), and three power-down modes controlled by PMGT1/PMGT0-achieving 1.3 mW at 10 kSPS (3 V) and full shutdown down to 5 µA with external clock off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with guaranteed no missing codes |
| Sampling Rate | 200 kSPS maximum-supports real-time signal capture up to 100 kHz Nyquist bandwidth |
| SNR | 70 dB min at 10 kHz input-enables accurate digitization of medium-bandwidth sensor signals |
| INL | ±1 LSB max (A/B versions)-ensures linearity critical for closed-loop control and metrology |
| Power (3 V) | 15 mW normal operation; 1.3 mW at 10 kSPS-optimized for battery life in portable systems |
| Analog Input Range | 0 to VREF (unipolar) or ±VREF/2 (bipolar)-configurable via AMODE bit without external components |
| Reference | Internal 2.5 V ±20 ppm/°C REFOUT; accepts external 1.2 V to AVDD-simplifies system reference design |
Pinout & Package
AD7854ARZ is housed in a 28-lead SOIC (R-28) package with 0.3-inch body width and standard JEDEC MS-013 footprint. Pin functions are electrically validated per Analog Devices AD7854/AD7854L Rev. B datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Conversion Start Input | Edge-triggered command to initiate track-to-hold transition and conversion; tied high if unused |
| BUSY | Conversion Status Output | Active-high open-drain signal indicating conversion or calibration in progress |
| CLKIN | Master Clock Input | 4 MHz nominal clock source-sets conversion time (4.6 µs) and calibration duration |
| AIN(+), AIN(–) | Pseudo-Differential Analog Inputs | Support unipolar (0 to VREF) or bipolar (±VREF/2) ranges; AIN(–) bias required in bipolar mode |
| REFIN/REFOUT | Reference I/O | Provides 2.5 V internal reference; accepts external reference up to AVDD for improved accuracy or ratiometric operation |
| DB0–DB11 | 12-Bit Parallel Data Bus | Three-state outputs; HBEN selects high/low byte access-enables 8-bit bus interfacing with external latching |
| WR, RD, CS, HBEN | Parallel Interface Controls | Enable register read/write, ADC output access, and byte-mode selection-no external logic needed for basic operation |
| AVDD, DVDD, AGND, DGND | Supply & Ground | Separate analog/digital supplies reduce noise coupling; requires 0.1 µF CREF1 and 0.01 µF CREF2 capacitors |
Key Features
| Feature | Design Value |
|---|---|
| Single 3 V to 5.5 V supply operation | Eliminates dual-rail power design; compatible with Li-ion, 3.3 V logic, and 5 V legacy systems |
| On-chip self- and system calibration | Compensates for gain/offset drift over temperature-reduces need for external calibration circuitry |
| Configurable analog input range | AMODE bit selects unipolar (straight binary) or bipolar (two's complement) coding-no hardware change required |
| Multiple power-down modes | Full shutdown (5 µA), partial sleep (400 µA), and auto-power-down post-conversion-extends battery runtime |
| Flexible parallel interface | 12-bit or byte-mode access via HBEN; supports direct connection to 8-bit microcontrollers with minimal glue logic |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of ECG, pulse oximetry, or temperature sensor outputs in handheld diagnostic devices. IC Role / Device Role / Timing Role: Primary 12-bit ADC capturing analog biosignals at ≤100 kHz with low power and calibrated accuracy. Use Value: On-chip calibration maintains ±1 LSB INL across –40°C to +85°C, reducing field recalibration needs and enabling FDA-compliant traceability. |
Use Scenario: Long-term environmental monitoring using thermistors, RTDs, and humidity sensors in remote field deployments. IC Role / Device Role / Timing Role: Low-power sampling ADC with automatic power-down between readings to minimize average current draw. Use Value: 1.3 mW at 10 kSPS and 5 µA shutdown current enable multi-year battery life in solar- or coin-cell-powered loggers. |
| Industrial Process Control | High-Speed Modem Analog Front End |
Use Scenario: Digitizing 4–20 mA loop signals, strain gauge bridges, and thermocouple outputs in PLC I/O modules. IC Role / Device Role / Timing Role: Precision ADC with bipolar input support and system calibration capability for sensor offset/gain compensation. Use Value: ±VREF/2 input range and system calibration registers allow direct ratiometric measurement against field transducer references. |
Use Scenario: Sampling baseband analog signals in V.34/V.90 modem designs requiring >70 dB SNR at audio frequencies. IC Role / Device Role / Timing Role: High-SNR, low-distortion ADC delivering 70 dB SNR and –78 dB THD for clean signal reconstruction. Use Value: Charge redistribution SAR architecture ensures stable performance across voltage and temperature-critical for FCC-certified signal fidelity. |
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 | Targeted at ultra-low-power systems where throughput <100 kSPS is acceptable | Select when battery life outweighs sampling rate requirements; shares same SOIC-28 footprint and register map |
| AD7856ARZ | 14-bit resolution, 100 kSPS, 2.5 V internal reference, SPI interface-higher resolution but serial-only communication | Suited for applications needing finer quantization but accepting SPI integration complexity | Choose for enhanced dynamic range in test equipment; not pin-compatible-requires PCB redesign and firmware update |
Compared with AD7854LAR3, AD7854ARZ delivers double the throughput and higher active power for speed-critical acquisition; compared with AD7856ARZ, it trades resolution and serial flexibility for deterministic parallel timing and lower system-level latency in microcontroller-based designs.
Availability
AD7854ARZ is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, industrial process control modules, and high-speed modem analog front ends requiring stable component supply, long-lifecycle availability, and traceable sourcing.
Supply support for AD7854ARZ 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 belongs to Analog Devices' precision SAR ADC product line, designed specifically for low-power, high-accuracy data acquisition in space- and energy-constrained embedded systems where calibration integrity and supply flexibility are essential.
FAQ
What is the maximum sampling rate supported by the AD7854ARZ?
The AD7854ARZ supports a maximum sampling rate of 200 kSPS, achieved with a 4 MHz master clock (CLKIN). Conversion time is fixed at 18 × tCLKIN = 4.6 µs. This throughput enables accurate digitization of signals up to 100 kHz under Nyquist criteria, making AD7854ARZ suitable for medium-bandwidth sensor and communication applications where deterministic timing is required.
Does the AD7854ARZ require external reference components?
Yes-the AD7854ARZ requires two external decoupling capacitors: a 0.1 µF multilayer ceramic capacitor (CREF1) and a 0.01 µF ceramic disc capacitor (CREF2), both connected between their respective pins (CREF1, CREF2) and AGND. These stabilize the internal reference and DAC charge redistribution network. The AD7854ARZ includes an internal 2.5 V reference (REFOUT), but external capacitors are mandatory for specified performance.
Can the AD7854ARZ operate with a 3.3 V supply?
Yes-the AD7854ARZ is fully specified for operation from 3.0 V to 5.5 V on both AVDD and DVDD. At 3.3 V, typical power dissipation is 15 mW in normal mode and 1.3 mW at 10 kSPS. Logic thresholds scale accordingly: VINH = 2.1 V min and VINL = 0.6 V max, ensuring reliable interfacing with 3.3 V microcontrollers and FPGAs without level-shifting.
How does the AD7854ARZ handle bipolar input signals?
The AD7854ARZ supports bipolar input ranges (±VREF/2) via the AMODE bit in its control register. When AMODE = 1, the ADC interprets input as two's complement, with AIN(–) biased to +VREF/2. AIN(+) may then swing from 0 V to AVDD, enabling measurement of differential signals centered at mid-supply. This eliminates external op-amp level-shifting circuitry in bridge or transducer applications.
Is the AD7854ARZ pin-compatible with the AD7854LAR3?
Yes-the AD7854ARZ and AD7854LAR3 share identical 28-lead SOIC (R-28) packaging, pinout, register map, and interface protocol. The only functional differences are maximum sampling rate (200 kSPS vs. 100 kSPS) and power consumption (15 mW vs. 5.5 mW at 3 V). System firmware and layout remain unchanged when migrating between these variants for power/performance trade-offs.
AD7854ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for AD7854ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7854ARZ 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 reliable?
The price and inventory of AD7854ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7854ARZ is usually 5 days.
3.What payment methods are accepted for AD7854ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7854ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7854ARZ?
AD7854ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7854ARZ 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?
For technical support, including AD7854ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7854ARZ requirements.
6.How does Aetrix verify that AD7854ARZ is sourced from the original manufacturer or authorized distributors?
All AD7854ARZ 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 meets industry standards.
7.What is the process for return or replacement of AD7854ARZ?
All AD7854ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7854ARZ, 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 part is unused and in its original packaging.
Return procedure for AD7854ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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