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Analog Devices Inc. AD7823YRZ-REEL7
- Part No.:
- AD7823YRZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7823YRZ-REEL7.pdf
- Description:
- IC ADC 8BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,102
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Product details
Overview
AD7823YRZ-REEL7 from Analog Devices is an 8-bit successive approximation ADC with 4 µs typical conversion time, pseudo-differential analog input (VIN+, VIN–), and microcontroller-compatible 3-wire serial interface (CONVST, SCLK, DOUT). It operates from a single 2.7 V to 5.5 V supply, features inherent track-and-hold, and is specified over –40°C to +125°C for battery-powered portable instrumentation.
For engineers reviewing the AD7823YRZ-REEL7 datasheet, AD7823YRZ-REEL7 pinout, AD7823YRZ-REEL7 application, or AD7823YRZ-REEL7 equivalent, key selection considerations include its automatic power-down mode (1 µA max standby current), 8-lead microSOIC package, ±0.5 LSB relative accuracy, 48 dB SNR at 30 kHz input, and VREF range of 1.2 V to VDD - critical for low-power, high-temperature embedded sensing.
Technical Context
The AD7823YRZ-REEL7 implements a charge redistribution DAC-based SAR architecture with internal oscillator and track-and-hold functionality. Its pseudo-differential input structure allows offset cancellation by applying system offset to VIN–, provided VIN– variation stays within ±0.5 LSB during conversion.
It supports two operating modes: Mode 1 (high-speed, no inter-conversion power-down, 4 µs conversion) and Mode 2 (automatic power-down after each conversion, 1.5 µs power-up + 5 µs conversion, enabling 54 µW at 1 kSPS). Serial data output is edge-aligned to SCLK rising edges, with CONVST serving dual roles - conversion trigger (falling edge) and serial port enable (rising edge).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes; LSB = VREF/256. |
| Conversion Time | 4 µs typ (Mode 1) - enables up to ~133 kSPS throughput when interfaced with fast microcontrollers. |
| Supply Range | 2.7 V to 5.5 V - supports direct connection to Li-ion (3.0–3.7 V) and 5 V logic rails without regulators. |
| Relative Accuracy | ±0.5 LSB max - ensures monotonicity and <0.2% full-scale error across temperature. |
| SNR | 48 dB min at fIN = 30 kHz - sufficient for 7.7 effective bits in medium-bandwidth sensor digitization. |
| Power (10 kSPS) | 570 µW - achieved via automatic power-down; eliminates need for external sleep control logic. |
| VREF Range | 1.2 V to VDD - permits internal reference use (VREF = VDD) or precision external reference down to 1.2 V. |
Pinout & Package
AD7823YRZ-REEL7 is housed in an 8-lead microSOIC package (3.0 mm × 3.0 mm, 0.65 mm pitch), RoHS-compliant and tape-and-reel packaged (REEL7 denotes 7-inch reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CONVST | Convert Start / Serial Enable | Falling edge initiates conversion and places T/H in hold; rising edge enables serial port - enables chip-select behavior in multi-device buses. |
| 2 - VIN+ | Positive Analog Input | Pseudo-differential input node; accepts 0 V to VREF signal; requires ≤125 Ω source impedance for full-spec acquisition. |
| 3 - VIN– | Negative Analog Input | Reference node for pseudo-differential operation; must remain stable within ±0.5 LSB during conversion to avoid code errors. |
| 4 - GND | Analog/Digital Ground | Single ground pin serves both analog and digital sections - requires low-impedance PCB return path to minimize noise coupling. |
| 5 - VREF | Reference Voltage Input | Accepts 1.2 V to VDD; determines full-scale range (0 V to VREF); can be tied directly to VDD to eliminate external reference. |
| 6 - DOUT | Serial Data Output | 3-state CMOS output; data valid on SCLK rising edges; enters high-Z after 8th clock falling edge. |
| 7 - SCLK | Serial Clock Input | Asynchronous clock input; timing-critical for data capture - min pulse width 25 ns at 5 V, 20 ns at 3 V. |
| 8 - VDD | Positive Supply | 2.7–5.5 V single supply; powers analog core, digital logic, and internal oscillator; decoupling capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| Inherent Track-and-Hold | Eliminates need for external sample-and-hold circuitry; acquisition time ≤100 ns ensures accurate sampling at up to 133 kSPS. |
| Automatic Power-Down Mode | Reduces average power to 54 µW at 1 kSPS - ideal for intermittent-sampling battery systems like handheld multimeters. |
| Microcontroller-Compatible Serial Interface | 3-wire (CONVST/SCLK/DOUT), no glue logic needed for PIC, QSPI, or SPI hosts; CONVST doubles as chip select. |
| Pseudo-Differential Input Architecture | Enables common-mode offset rejection - e.g., apply system offset to VIN– while measuring signal on VIN+ - without external op-amps. |
| Extended Temperature Range | –40°C to +125°C operation validated - suitable for under-hood automotive sensors and industrial motor controllers. |
Applications
| Battery-Powered Test Equipment | Battery-Powered Communications Systems |
|---|---|
Use Scenario: Handheld digital multimeter acquiring DC voltage and current measurements with <100 ms update rate. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog signals from shunt resistors and voltage dividers; CONVST-triggered conversions synchronize with display refresh. Use Value: 570 µW power at 10 kSPS extends alkaline battery life to >500 hours; microSOIC footprint saves board space vs. SOIC alternatives. | Use Scenario: Portable RF transceiver monitoring supply rail voltage and PA bias current during burst transmission. IC Role / Device Role / Timing Role: ADC performs periodic health checks on VBAT and IPA; automatic power-down minimizes quiescent current between bursts. Use Value: 1 µA max standby current in power-down mode prevents measurable drain on Li-Po battery during idle periods. |
| Industrial Sensor Signal Conditioning | Automotive Engine Control Unit Monitoring |
Use Scenario: 4–20 mA loop-powered pressure transmitter digitizing bridge output in harsh factory environments. IC Role / Device Role / Timing Role: ADC interfaces to instrumentation amplifier output; pseudo-differential input rejects common-mode noise from 24 V loop supply. Use Value: ±0.5 LSB relative accuracy maintains <0.2% measurement fidelity across –40°C to +125°C ambient - meets SIL-2 functional safety requirements. | Use Scenario: Engine coolant temperature and oil pressure monitoring in ECU modules mounted near engine block. IC Role / Device Role / Timing Role: ADC samples thermistor and piezoresistive sensor outputs; operates continuously in Mode 1 for real-time feedback control. Use Value: 4 µs conversion time enables 100+ sensor readings per control cycle; 125°C rating avoids derating or thermal throttling. |
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-REEL7 | 10-bit resolution, same 8-lead microSOIC package, 4 µs conversion, identical pinout and serial interface. | Higher resolution required for precision sensor calibration; higher SNR (58 dB) but increased power (1.2 mW at 10 kSPS). | Select AD7810YRZ-REEL7 when 10-bit accuracy is mandatory and system power budget allows ~2× increase over AD7823YRZ-REEL7. |
| MAX1113EUA+ | 8-bit, 3.5 µs conversion, 8-lead µMAX package, SPI-compatible 3-wire interface, but requires external reference and has no auto power-down. | Lower cost alternative where reference is already available; lacks integrated power management for ultra-low-power designs. | Choose MAX1113EUA+ only if board space allows µMAX (3.0 × 3.0 mm same size) and external reference is present - not drop-in due to different CONVST timing and no VREF-to-VDD option. |
Compared with AD7823YRZ-REEL7, AD7810YRZ-REEL7 offers higher resolution at identical speed and footprint, while MAX1113EUA+ trades integrated power control and reference flexibility for lower unit cost - making AD7823YRZ-REEL7 optimal for battery-constrained, single-supply, offset-cancelling applications.
Availability
AD7823YRZ-REEL7 is available at Aetrix Electronics and suitable for battery-powered test equipment, industrial sensor signal conditioning, and automotive engine control unit monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7823YRZ-REEL7 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, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing ICs for precision measurement and control.
The AD7823 belongs to Analog Devices' legacy high-speed, low-power SAR ADC product line, designed specifically for space-constrained, battery-operated instrumentation requiring robust performance across extreme temperatures without external support components.
FAQ
What is the maximum recommended source impedance for the AD7823YRZ-REEL7 analog inputs?
The AD7823YRZ-REEL7 analog input structure includes a 125 Ω internal switch resistance and 3.5 pF sampling capacitor. For full-spec acquisition, source impedance should be ≤125 Ω. At higher impedances (e.g., >4.6 kΩ), DC acquisition time exceeds 100 ns, degrading accuracy. Use an op-amp buffer if driving from high-impedance sources like thermistors or potentiometers. The AD7823YRZ-REEL7 datasheet specifies this limit in the DC Acquisition Time section.
Can the AD7823YRZ-REEL7 operate with VREF = 1.2 V while powered from VDD = 3.3 V?
Yes. The AD7823YRZ-REEL7 supports VREF from 1.2 V to VDD. With VDD = 3.3 V and VREF = 1.2 V, the analog input range becomes 0 V to 1.2 V, and LSB size is 1.2 V / 256 ≈ 4.69 mV. This configuration is valid and maintains all AC/DC specifications - confirmed in the REFERENCE INPUTS table (Rev. C, p.3) and General Description. The AD7823YRZ-REEL7 remains fully functional across this VREF range.
Does the AD7823YRZ-REEL7 require an external crystal or clock source?
No. The AD7823YRZ-REEL7 contains an internal oscillator and requires no external clock source. Conversion timing is self-contained: 4 µs typical conversion time is generated internally. Only the external SCLK is needed for serial data readout - its frequency determines data transfer rate, not conversion speed. The AD7823YRZ-REEL7 functional block diagram (p.1) and Timing Characteristics table (p.3) confirm internal clock generation.
How does the pseudo-differential input of the AD7823YRZ-REEL7 improve measurement accuracy?
The AD7823YRZ-REEL7 pseudo-differential input (VIN+, VIN–) allows common-mode offset cancellation: applying a known system offset (e.g., 0.5 V) to VIN– while measuring signal on VIN+ shifts the effective input range. This rejects fixed offsets without external amplifiers. However, VIN– must remain stable within ±0.5 LSB during conversion - verified in the Analog Input section (p.7) and PIN FUNCTION DESCRIPTIONS. The AD7823YRZ-REEL7 achieves this via internal sampling capacitor switching, not true differential front-end.
Is the AD7823YRZ-REEL7 pin-compatible with the AD7823YRZ?
Yes. AD7823YRZ-REEL7 and AD7823YRZ share identical microSOIC-8 packaging, pinout, electrical specifications, and thermal characteristics. The "-REEL7" suffix denotes tape-and-reel packaging (7-inch reel, 2500 units/reel); the base part number AD7823YRZ defines the device. Both comply with the same Ordering Guide entry (AD7823YRM, RM-8 package) and are interchangeable at the PCB level - confirmed in the Rev. C Ordering Guide (p.4) and Package Option column.
AD7823YRZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 8
- 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
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7823YRZ-REEL7 FAQ
1.How can I place an order for AD7823YRZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7823YRZ-REEL7 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 AD7823YRZ-REEL7 reliable?
The price and inventory of AD7823YRZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7823YRZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7823YRZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7823YRZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7823YRZ-REEL7?
AD7823YRZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7823YRZ-REEL7 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 AD7823YRZ-REEL7?
For technical support, including AD7823YRZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7823YRZ-REEL7 requirements.
6.How does Aetrix verify that AD7823YRZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7823YRZ-REEL7 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 AD7823YRZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7823YRZ-REEL7?
All AD7823YRZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7823YRZ-REEL7, 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 AD7823YRZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7823YRZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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