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Analog Devices Inc. AD7823YN
- Part No.:
- AD7823YN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7823YN.pdf
- Description:
- IC ADC 8BIT SRL 2.7/5.5V 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:7,050
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Product details
Overview
AD7823YN from Analog Devices is an 8-bit successive approximation ADC with inherent track-and-hold, 4 µs typical conversion time, ±1 LSB gain error, and operation from 2.7 V to 5.5 V - used in battery-powered test equipment for precise unipolar analog input digitization (0 V to VREF) with pseudo-differential input support.
For engineers reviewing the AD7823YN datasheet, AD7823YN pinout, AD7823YN application, or AD7823YN equivalent, this page delivers verified technical context, real-world timing behavior (tCONV = 4 µs typ, tACQ = 100 ns max), power-down mode implementation details, and validated alternative options for low-power 8-bit SAR ADC selection.
Technical Context
The AD7823YN implements a charge redistribution DAC architecture with internal oscillator, enabling self-contained 4 µs conversion without external clock dependency. Its pseudo-differential input (VIN+, VIN–) supports offset cancellation by applying system offset to VIN–, provided VREF ≤ VDD – VOFFSET.
Two distinct operating modes are defined: Mode 1 (high-speed, no inter-conversion power-down) achieves up to 133 kSPS throughput; Mode 2 (automatic power-down) reduces average power to 54 µW at 1 kSPS by powering down after each conversion and waking on CONVST rising edge - with guaranteed 1.5 µs power-up time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes; LSB size = VREF/256. |
| Conversion Time | 4 µs typical - defines minimum cycle time in high-speed Mode 1; enables >100 kSPS sustained sampling. |
| Supply Range | 2.7 V to 5.5 V - single-supply operation compatible with Li-ion, 3.3 V, and 5 V systems without level-shifting. |
| Power Dissipation | 570 µW at 10 kSPS - achieved via automatic power-down; rises to 2.9 mW at 50 kSPS in active mode. |
| Input Type | Pseudo-differential - VIN+ accepts signal, VIN– accepts reference/offset; requires VIN– stability within ±0.5 LSB during conversion. |
| Reference Range | 1.2 V to VDD - allows internal VDD as reference (0 V to VDD input range) or external precision reference. |
| Temperature Range | –40°C to +125°C - fully specified for automotive under-hood, industrial sensor, and harsh-environment applications. |
Pinout & Package
AD7823YN is housed in an 8-lead plastic DIP (0.3" wide, N-8 package) with through-hole mounting compatibility and 125°C/W θJA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CONVST | Convert Start / Serial Enable | Falling edge initiates conversion and places track-and-hold in hold mode; rising edge enables serial port - dual function critical for Mode 2 power management. |
| 2 VIN+ | Analog Input (+) | Primary signal input node; accepts 0 V to VREF; internal sampling capacitor connects here during acquisition phase. |
| 3 VIN– | Analog Input (–) | Reference/offset node for pseudo-differential operation; must remain stable within ±0.5 LSB during conversion to avoid code errors. |
| 4 GND | Analog/Digital Ground | Common return for analog and digital circuitry; requires low-impedance connection to minimize noise coupling. |
| 5 VREF | Reference Input | Defines full-scale range (0 V to VREF); may be tied directly to VDD for simplified 0 V to VDD input scaling. |
| 6 DOUT | Serial Data Output | 3-state CMOS output; data valid on rising SCLK edges; enters high-Z state after eighth SCLK falling edge. |
| 7 SCLK | Serial Clock Input | Asynchronous master clock; controls bit-shift timing; no duty-cycle requirement - supports variable-rate microcontroller interfaces. |
| 8 VDD | Positive Supply | 2.7 V to 5.5 V single supply; powers analog core, digital logic, and internal oscillator; decoupling required per Figure 6. |
Key Features
| Feature | Design Value |
|---|---|
| Inherent Track-and-Hold | Eliminates need for external sample-and-hold; acquisition time limited only by 100 ns internal settling - simplifies front-end design. |
| Microcontroller-Compatible Serial Interface | 3-wire (CONVST/SCLK/DOUT), no glue logic required; interoperable with SPI, QSPI, and PIC SSP peripherals - reduces BOM count. |
| Automatic Power-Down Mode | Reduces IDD to 1 µA max between conversions; enables 54 µW average power at 1 kSPS - extends battery life in portable instrumentation. |
| Wide Temperature Specification | –40°C to +125°C performance guaranteed - suitable for engine control units, motor drives, and industrial PLC analog inputs. |
| Pseudo-Differential Input Architecture | Enables common-mode offset rejection by applying system offset to VIN–; preserves dynamic range when measuring small signals over large DC baselines. |
Applications
| Battery-Powered Test Equipment | Battery-Powered Communications Systems |
|---|---|
Use Scenario: Handheld multimeter digitizing sensor outputs (e.g., thermocouple voltage, pressure transducer mV) using internal Li-ion supply. IC Role / Device Role / Timing Role: ADC core with integrated track-and-hold; performs 8-bit digitization every 100 µs (10 kSPS) with automatic power-down between samples. Use Value: 570 µW average power consumption at 10 kSPS enables >100 hours of continuous operation on a 1 Ah battery. | Use Scenario: Field-deployable RF modem monitoring supply rail voltage and temperature for health reporting. IC Role / Device Role / Timing Role: Low-latency analog monitor; acquires VDD and thermal sensor voltage in <4 µs, then powers down until next scheduled read. Use Value: Pseudo-differential input rejects common-mode noise from switching power supplies, preserving measurement integrity in noisy RF environments. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module Monitoring |
Use Scenario: 4–20 mA loop receiver board converting current-to-voltage output into digital values for PLC interface. IC Role / Device Role / Timing Role: Precision 8-bit converter with VREF = VDD; accepts 0–5 V input scaled from shunt resistor; operates across –40°C to +125°C. Use Value: ±1 LSB gain error and ±1 LSB total unadjusted error ensure repeatability in closed-loop feedback control without calibration. | Use Scenario: Dashboard cluster measuring cabin temperature, battery voltage, and door switch status in passenger vehicles. IC Role / Device Role / Timing Role: High-reliability ADC for safety-critical monitoring; uses VIN– grounded for single-ended operation and VREF = VDD for rail-to-rail input range. Use Value: Guaranteed operation at +125°C ambient enables placement near HVAC ducts or under-hood ECUs without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7810YRZ | 10-bit resolution, same 8-lead SOIC package, 3.5 µs conversion, wider VREF range (1.2 V to 7 V). | Higher resolution required for precision sensor digitization; not drop-in - requires firmware update for 10-bit data handling. | Select AD7810YRZ when 10-bit accuracy is mandatory and layout supports SOIC; AD7823YN remains optimal for cost-sensitive 8-bit use cases. |
| MAX1113EPA+ | 8-bit, 3.5 µs conversion, 2.7–5.25 V supply, SPI-compatible 3-wire interface, but no automatic power-down mode. | Lacks CONVST-controlled power management; requires external sleep control logic for ultra-low-power operation. | Choose MAX1113EPA+ only if existing design already uses Maxim's SPI timing model and power sequencing is handled externally. |
Compared with AD7823YN, AD7810YRZ offers higher resolution at the cost of increased code depth and non-drop-in firmware changes, while MAX1113EPA+ matches speed and bit depth but lacks integrated power-down - making AD7823YN uniquely suited for battery-constrained designs requiring autonomous low-power operation.
Availability
AD7823YN is available at Aetrix Electronics and suitable for battery-powered test equipment, industrial sensor signal conditioning, and automotive body control module monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7823YN 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 AD7823YN belongs to Analog Devices' precision SAR ADC product line, engineered specifically for low-power, high-speed digitization in space-constrained and energy-sensitive applications - emphasizing integration, temperature robustness, and microcontroller interoperability.
FAQ
What is the maximum recommended source impedance for the AD7823YN analog input?
The AD7823YN analog input has an internal multiplexer resistance of 125 Ω and a 3.5 pF sampling capacitor. For accurate acquisition within 100 ns, source impedance should be ≤4.6 kΩ. At RSOURCE = 10 Ω, charging time is ~2 ns; above 4.6 kΩ, acquisition time increases significantly. External buffering is recommended for high-impedance sensors to maintain THD and accuracy specs. The AD7823YN datasheet specifies this limit in the DC Acquisition Time section.
Does the AD7823YN require an external clock for conversion?
No, the AD7823YN does not require an external clock for conversion. It contains an internal oscillator that drives the successive approximation process, resulting in a typical 4 µs conversion time independent of external timing. The SCLK signal is used solely for serial data readout and does not affect conversion timing. This self-timed operation simplifies system design and eliminates clock synchronization concerns - a key feature confirmed in the Functional Block Diagram and General Description of the AD7823YN datasheet.
Can the AD7823YN operate with VREF = VDD, and what is the resulting input range?
Yes, the AD7823YN supports VREF tied directly to VDD, enabling a 0 V to VDD analog input range. The datasheet explicitly states "Reference Input Range: 0 V to VDD" and confirms this configuration eliminates the need for an external reference. When VDD = 3.3 V, the input range becomes 0–3.3 V; at VDD = 5 V, it is 0–5 V. This flexibility simplifies power architecture in single-supply systems - a capability verified in the GENERAL DESCRIPTION and REFERENCE INPUTS specification table for AD7823YN.
How does the automatic power-down mode work in the AD7823YN?
The AD7823YN automatic power-down mode (Mode 2) powers down the device at the end of each conversion when CONVST remains low. A rising edge on CONVST wakes the part (1.5 µs power-up time), and the subsequent falling edge initiates conversion. After conversion completes (~5 µs), the part powers down again. This cycle reduces average power to 54 µW at 1 kSPS. The behavior is controlled entirely by CONVST timing - no software or register writes needed. This mechanism is detailed in Figures 13 and 15 and the OPERATING MODES section of the AD7823YN datasheet.
Is the AD7823YN pin-compatible with other members of the AD78xx family?
No, the AD7823YN is not pin-compatible with other AD78xx devices such as AD7810 or AD7811. While all share an 8-lead package footprint, pin functions differ: AD7810 uses different serial protocol timing and lacks the dual-role CONVST pin (convert start + serial enable) implemented in AD7823YN. The AD7823YN pinout (CONVST/VIN+/VIN–/GND/VREF/DOUT/SCLK/VDD) is unique to its architecture and timing model. This distinction is confirmed in the PIN FUNCTION DESCRIPTIONS and ORDERING GUIDE sections of the AD7823YN datasheet.
AD7823YN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7823YN FAQ
1.How can I place an order for AD7823YN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7823YN 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 AD7823YN reliable?
The price and inventory of AD7823YN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7823YN is usually 5 days.
3.What payment methods are accepted for AD7823YN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7823YN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7823YN?
AD7823YN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7823YN 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 AD7823YN?
For technical support, including AD7823YN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7823YN requirements.
6.How does Aetrix verify that AD7823YN is sourced from the original manufacturer or authorized distributors?
All AD7823YN 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 AD7823YN meets industry standards.
7.What is the process for return or replacement of AD7823YN?
All AD7823YN units undergo pre-shipment inspection (PSI). If there is an issue with AD7823YN, 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 AD7823YN part is unused and in its original packaging.
Return procedure for AD7823YN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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