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Analog Devices Inc. AD7920BKSZ-REEL
- Part No.:
- AD7920BKSZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
AD7920BKSZ-REEL.pdf
- Description:
- 12-BIT 250KSPS,ADC SC70 PKG I.C.
- Quantity:
- Payment:
- Shipping:
Inventory:1,794
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Product details
Overview
AD7920BKSZ-REEL from Analog Devices is a 12-bit, 250 kSPS successive approximation ADC in a 6-lead SC70 package, operating from a single 2.35 V to 5.25 V supply. It features 71 dB SNR at 100 kHz input, 0–VDD analog input range, and SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface. It serves as the primary analog-to-digital conversion stage in portable medical sensors and battery-powered data loggers.
For engineers reviewing the AD7920BKSZ-REEL datasheet, AD7920BKSZ-REEL pinout, AD7920BKSZ-REEL application, or AD7920BKSZ-REEL equivalent, key selection considerations include its 12-bit resolution with ±1.5 LSB INL, 250 ns track-and-hold acquisition time, 1 μA max standby current, and internal VDD-referenced architecture eliminating external reference components.
Technical Context
The AD7920BKSZ-REEL implements a charge redistribution SAR architecture with no pipeline delay, sampling on the falling edge of CS and completing conversion in 16 SCLK cycles. Its track-and-hold amplifier supports full-power bandwidth up to 13.5 MHz and handles input frequencies exceeding 13 MHz.
Conversion timing is fully synchronous to SCLK, with tCONVERT = 16 × tSCLK and tACQ ≤ 250 ns. The device uses VDD as its reference source, enabling 0 V to VDD input range and simplifying system-level power domain alignment without external reference routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 1 LSB = VDD/4096 quantization step for precise low-voltage signal digitization |
| Throughput Rate | 250 kSPS - supports real-time capture of signals up to ~125 kHz Nyquist bandwidth |
| SNR @ 100 kHz | 71 dB min - enables >11.5 effective number of bits (ENOB) in mid-band sensor applications |
| INL | ±1.5 LSB max - ensures monotonicity and <0.04% full-scale linearity error across temperature |
| Supply Range | 2.35 V to 5.25 V - compatible with Li-ion, 3.3 V, and 5 V system rails without level-shifting |
| Standby Current | 1 μA max - reduces average power to <1 μW during idle intervals in duty-cycled systems |
| Input Range | 0 V to VDD - eliminates need for external biasing or rail-splitting networks |
Pinout & Package
AD7920BKSZ-REEL is housed in a 6-lead SC70 package (2.0 mm × 1.25 mm × 0.9 mm), optimized for space-constrained PCB layouts in portable instrumentation and wearables.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power Supply Input | Single-supply rail (2.35–5.25 V); also serves as internal reference source for full-scale ADC range |
| GND (Pin 2) | Analog Ground | Common reference for analog input and internal circuitry; must be star-connected to minimize noise coupling |
| VIN (Pin 3) | Analog Input | Single-ended input with 20 pF input capacitance; accepts 0–VDD signals without external scaling |
| SCLK (Pin 4) | Serial Clock Input | Controls both data readout timing and internal conversion clock; supports up to 5 MHz operation |
| SDATA (Pin 5) | Serial Data Output | MSB-first 12-bit result preceded by four leading zeros; tri-state capable for bus sharing |
| CS (Pin 6) | Chip Select | Active-low initiation signal; falling edge triggers sampling and conversion start |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Guarantees deterministic 3.2 μs max conversion time and precise sampling instant control via CS edge |
| VDD-referenced architecture | Eliminates external reference IC and associated layout complexity while maintaining 0–VDD input range |
| Flexible power management | Reduces average power via SCLK-governed throughput and 1 μA max standby mode between conversions |
| Wide supply range | Operates across 2.35–5.25 V, supporting direct connection to Li-ion cells (3.0–4.2 V) and regulated 3.3 V rails |
| High-speed serial interface | Native SPI/QSPI/MICROWIRE/DSP compatibility enables plug-in integration with common microcontrollers |
Applications
| Portable ECG Monitor | Wireless Sensor Node |
|---|---|
Use Scenario: Continuous acquisition of low-amplitude biopotential signals (0.5–5 mV) from dry electrodes under motion artifact conditions. IC Role / Device Role / Timing Role: Primary 12-bit SAR ADC performing synchronized sampling at 250 kSPS with precise CS-triggered aperture control. Use Value: 71 dB SNR and 13.5 MHz full-power bandwidth preserve signal fidelity despite electrode-skin impedance variations and high-frequency noise. |
Use Scenario: Battery-powered environmental sensing node measuring temperature, humidity, and gas concentration with 10-year field deployment target. IC Role / Device Role / Timing Role: Low-power analog front-end digitizer entering 1 μA standby between 1-second measurement bursts. Use Value: Sub-μW standby power and VDD-referenced operation eliminate reference drift and extend coin-cell lifetime beyond 3 years. |
| Handheld Diagnostic Tool | Industrial Loop-Powered Transmitter |
Use Scenario: Field-deployable handheld instrument acquiring multi-channel analog sensor outputs (pressure, flow, pH) with minimal calibration overhead. IC Role / Device Role / Timing Role: Single-supply 12-bit ADC interfacing directly to op-amp buffers without level-shifting or external references. Use Value: ±1.5 LSB INL and 0–VDD input range simplify factory calibration and reduce firmware compensation routines. |
Use Scenario: 4–20 mA loop-powered transmitter digitizing process variables (e.g., thermocouple, RTD) in hazardous environments. IC Role / Device Role / Timing Role: Isolated-side ADC operating from limited loop power budget (<4 mA total), requiring ultra-low quiescent current. Use Value: 1.4 mA max operational current at 250 kSPS and 1 μA standby enable full functionality within strict loop power envelope. |
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 |
|---|---|---|---|
| ADS7822U | 12-bit, 200 kSPS, 8-lead SOIC; requires external reference; 2.7–5.5 V supply | Larger footprint; higher power (1.25 mW at 200 kSPS); no VDD-referenced input range | Select when board area is unconstrained and external reference precision is required over simplicity |
| MAX1116EKA+T | 12-bit, 250 kSPS, 6-lead SOT23; internal reference; 2.7–3.6 V only | Narrower supply range; fixed 2.048 V reference limits dynamic range flexibility | Select for 3 V-only systems where guaranteed 2.048 V reference stability outweighs VDD-scaling advantage |
Compared with ADS7822U and MAX1116EKA+T, AD7920BKSZ-REEL uniquely combines 6-lead SC70 packaging, VDD-referenced 0–VDD input, and 250 kSPS throughput-enabling smaller PCB area, simpler BOM, and adaptive full-scale range without sacrificing ENOB or power efficiency.
Availability
AD7920BKSZ-REEL is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and wireless sensor nodes requiring stable component supply across extended production lifecycles.
Supply support for AD7920BKSZ-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 AD7920BKSZ-REEL belongs to the AD7910/AD7920 family of micropower SAR ADCs designed specifically for space- and power-constrained data acquisition in portable and remote sensing applications.
FAQ
What is the maximum sampling rate supported by the AD7920BKSZ-REEL?
The AD7920BKSZ-REEL supports a maximum throughput rate of 250 kSPS, achieved with a 5 MHz SCLK. Conversion time is fixed at 16 SCLK cycles, resulting in a 3.2 μs max conversion duration. This rate is guaranteed across the full −40°C to +85°C operating temperature range and 2.35 V to 5.25 V supply voltage range.
Does the AD7920BKSZ-REEL require an external voltage reference?
No, the AD7920BKSZ-REEL does not require an external voltage reference. It uses the VDD supply as its internal reference source, establishing a 0 V to VDD analog input range. This eliminates external reference components, reduces BOM count, and avoids reference-related drift or noise coupling in compact layouts.
What is the analog input voltage range specification for the AD7920BKSZ-REEL?
The AD7920BKSZ-REEL has a specified analog input voltage range of 0 V to VDD. This means the full-scale range scales linearly with the applied VDD voltage-for example, 0–3.3 V with a 3.3 V supply or 0–5.0 V with a 5.0 V supply-providing maximum dynamic range without signal attenuation or amplification.
How does the power-down mode function in the AD7920BKSZ-REEL?
The AD7920BKSZ-REEL enters full power-down mode when CS remains high and no SCLK activity occurs for >100 ns. In this state, current consumption drops to 1 μA maximum (typically 50 nA), reducing power to <5 μW at 3 V. Power-up time from full power-down is 1 μs max, allowing rapid resumption of conversion without startup delays.
Which serial interface protocols is the AD7920BKSZ-REEL compatible with?
The AD7920BKSZ-REEL features a standard SPI-compatible serial interface that operates with SPI®, QSPI™, MICROWIRE™, and DSP host controllers. It uses CS as frame sync, SCLK for clocking, and SDATA for MSB-first output-supporting 4 leading zeros followed by 12 data bits, with no additional protocol overhead or configuration registers.
AD7920BKSZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Supply
- Voltage - Supply, Analog:
- 2.35V ~ 5.25V
- Voltage - Supply, Digital:
- 2.35V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- SC-70-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7920BKSZ-REEL FAQ
1.How can I place an order for AD7920BKSZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7920BKSZ-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 AD7920BKSZ-REEL reliable?
The price and inventory of AD7920BKSZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7920BKSZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7920BKSZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7920BKSZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7920BKSZ-REEL?
AD7920BKSZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7920BKSZ-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 AD7920BKSZ-REEL?
For technical support, including AD7920BKSZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7920BKSZ-REEL requirements.
6.How does Aetrix verify that AD7920BKSZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7920BKSZ-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 AD7920BKSZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7920BKSZ-REEL?
All AD7920BKSZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7920BKSZ-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 AD7920BKSZ-REEL part is unused and in its original packaging.
Return procedure for AD7920BKSZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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