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Analog Devices Inc. AD7920BKSZ-REEL7
- Part No.:
- AD7920BKSZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
AD7920BKSZ-REEL7.pdf
- Description:
- IC ADC 12BIT SAR SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,317
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Product details
Overview
AD7920BKSZ-REEL7 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 a high-speed, low-power data acquisition front-end in portable instrumentation and battery-powered sensor interfaces.
For engineers reviewing the AD7920BKSZ-REEL7 datasheet, AD7920BKSZ-REEL7 pinout, AD7920BKSZ-REEL7 application, or AD7920BKSZ-REEL7 equivalent, key selection considerations include its 12-bit resolution with ±1.5 LSB INL (B grade), 3.2 μs conversion time, 1 μA max standby current, and internal VDD-referenced architecture eliminating external reference requirements.
Technical Context
The AD7920BKSZ-REEL7 implements a charge redistribution SAR architecture with integrated track-and-hold, enabling accurate sampling of input signals up to 13.5 MHz full-power bandwidth. Its conversion is initiated by the falling edge of CS and clocked entirely by SCLK - requiring 16 cycles at 5 MHz for a complete 12-bit result.
No pipeline delay exists; acquisition completes in ≤250 ns after conversion ends, and the serial output delivers four leading zeros followed by 12 MSB-first data bits. Power management is controlled via CS assertion and timing - entering full power-down mode (1 μA max) when CS remains high between conversions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes across full-scale range |
| Throughput Rate | 250 kSPS maximum - supports real-time sampling of signals up to ~125 kHz Nyquist bandwidth |
| SNR @ 100 kHz | 71 dB minimum (VDD = 2.35–3.6 V) - enables high-fidelity digitization of medium-bandwidth analog signals |
| INL (B Grade) | ±1.5 LSB maximum - ensures monotonicity and <0.037% full-scale linearity error |
| Conversion Time | 3.2 μs maximum - fixed 16-SCLK cycle duration at 5 MHz, no variable latency |
| Supply Range | 2.35 V to 5.25 V - supports direct interfacing with 3 V and 5 V logic domains without level shifting |
| Standby Current | 1 μA maximum - reduces average power to ~3 μW at 3 V during idle intervals |
Pinout & Package
AD7920BKSZ-REEL7 is housed in a 6-lead SC70 package (2.0 mm × 1.25 mm, 0.9 mm height), optimized for space-constrained PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power Supply Input | Single-supply rail (2.35–5.25 V); also serves as internal reference source for full 0–VDD analog input range |
| 2 - GND | Analog Ground Reference | Common return for analog circuitry; must be routed separately from digital ground to minimize noise coupling |
| 3 - VIN | Analog Input Channel | Single-ended input with 20 pF input capacitance; accepts 0 V to VDD range without external scaling |
| 4 - SCLK | Serial Clock Input | Controls both data readout timing and internal SAR conversion clock; 10 kHz–5 MHz operation supported |
| 5 - SDATA | Serial Data Output | Three-state CMOS output delivering 12-bit result MSB-first, prefixed by four zero bits |
| 6 - CS | Chip Select / Conversion Trigger | Active-low signal initiating sample acquisition on falling edge; also frames serial data transfer window |
Key Features
| Feature | Design Value |
|---|---|
| VDD-referenced architecture | Eliminates need for external voltage reference, simplifying BOM and reducing board area |
| No pipeline delay | Enables deterministic, one-shot conversion control via CS - critical for synchronized multi-channel sampling |
| Flexible serial interface | Native compatibility with SPI, QSPI, MICROWIRE, and DSP host controllers without protocol translation |
| Low-power power-down mode | Reduces quiescent current to 1 μA max, enabling microamp-level system sleep states |
| Wide input bandwidth | 13.5 MHz full-power bandwidth supports anti-aliasing filter design with relaxed cutoff requirements |
Applications
| Battery-Powered Medical Sensors | Portable Data Acquisition Units |
|---|---|
Use Scenario: Continuous monitoring of ECG/EEG analog waveforms in handheld diagnostic devices with strict battery life targets. IC Role / Device Role / Timing Role: Primary analog-to-digital converter acquiring single-ended biopotential signals at 250 kSPS with minimal power overhead. Use Value: 71 dB SNR preserves clinical-grade signal fidelity while 1 μA standby current extends operational runtime between charges. |
Use Scenario: Field-deployable environmental sensor node measuring temperature, pressure, and humidity with microcontroller-based logging. IC Role / Device Role / Timing Role: High-accuracy front-end ADC interfacing directly to low-impedance transducer outputs via simple RC filtering. Use Value: 0–VDD input range and internal reference eliminate calibration drift from external reference components under varying supply conditions. |
| Optical Sensor Signal Conditioning | Industrial Process Monitoring |
Use Scenario: Digitizing photodiode or phototransistor output in compact optical encoders or ambient light sensors. IC Role / Device Role / Timing Role: Low-noise, wide-bandwidth ADC capturing fast transient pulses from optical events with precise timing alignment. Use Value: 13.5 MHz full-power bandwidth accommodates >100 kHz optical modulation frequencies without amplitude roll-off. |
Use Scenario: Retrofitting legacy analog instrumentation with digital output capability in factory-floor PLC I/O modules. IC Role / Device Role / Timing Role: Standalone precision ADC providing isolated, calibrated 12-bit readings over SPI to industrial microcontrollers. Use Value: ±1.5 LSB INL ensures repeatability across temperature (−40°C to +85°C), meeting Class A accuracy requirements for process control. |
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 |
|---|---|---|---|
| AD7923BRMZ-REEL | 4-channel, 12-bit SAR ADC in 10-lead MSOP; shares same core architecture but adds multiplexer and internal reference | Requires no external mux or reference; suited for multi-sensor systems needing channel scanning | Select AD7923BRMZ-REEL when consolidating multiple analog inputs onto one IC; AD7920BKSZ-REEL7 remains optimal for single-channel, ultra-small-footprint designs |
| ADS7822U | 12-bit, 250 kSPS SAR ADC in 8-pin SOIC; uses external reference and requires separate power-down control pin | Lacks VDD-referenced operation and integrated power-down - increases external component count and layout complexity | Choose ADS7822U only if legacy SOIC footprint compatibility is mandatory; AD7920BKSZ-REEL7 offers superior integration and smaller size |
Compared with AD7923BRMZ-REEL and ADS7822U, AD7920BKSZ-REEL7 uniquely combines single-channel simplicity, SC70 miniaturization, VDD-referenced operation, and CS-controlled power-down - making it the most efficient solution for space- and power-constrained 12-bit data acquisition.
Availability
AD7920BKSZ-REEL7 is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable data acquisition units, optical sensor interfaces, and industrial process monitoring systems requiring stable component supply and long-term production continuity.
Supply support for AD7920BKSZ-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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD7920BKSZ-REEL7 belongs to Analog Devices' precision SAR ADC product line, engineered for low-power, high-accuracy data acquisition in portable and embedded systems where size, energy efficiency, and signal integrity are critical.
FAQ
What is the guaranteed resolution and accuracy of AD7920BKSZ-REEL7?
The AD7920BKSZ-REEL7 is a guaranteed 12-bit analog-to-digital converter with B-grade specifications: ±1.5 LSB integral nonlinearity (INL), ±0.9/+1.5 LSB differential nonlinearity (DNL), and ±2 LSB total unadjusted error (TUE). These parameters are tested and specified across −40°C to +85°C and 2.35 V to 5.25 V supply range, ensuring monotonic operation and no missing codes to 12 bits.
Does AD7920BKSZ-REEL7 require an external voltage reference?
No, AD7920BKSZ-REEL7 does not require an external voltage reference. Its reference is derived internally from the VDD supply, establishing a 0 V to VDD analog input range. This eliminates external reference components, reduces system cost and board area, and avoids reference-related drift or noise - though input signal dynamic range scales directly with VDD stability.
How is power-down mode activated on AD7920BKSZ-REEL7?
Power-down mode on AD7920BKSZ-REEL7 is activated automatically when the CS pin remains high between conversions. In this state, current consumption drops to 1 μA maximum (typically 50 nA), and the device retains all internal bias settings. Full functionality resumes within 1 μs after the next CS falling edge initiates a new conversion - no re-initialization is required.
What serial interface protocols does AD7920BKSZ-REEL7 support?
AD7920BKSZ-REEL7 supports SPI®, QSPI™, MICROWIRE™, and generic DSP-compatible serial interfaces. It uses a standard 4-wire configuration (CS, SCLK, SDATA, GND) with data output on the falling edge of SCLK. The part delivers 12-bit results MSB-first, prefixed by four leading zeros, and operates with SCLK frequencies from 10 kHz to 5 MHz - compatible with common microcontroller SPI peripherals without additional glue logic.
What is the analog input bandwidth and acquisition performance of AD7920BKSZ-REEL7?
AD7920BKSZ-REEL7 features a 13.5 MHz full-power bandwidth (−3 dB point) and 2 MHz bandwidth at −0.1 dB, supporting accurate digitization of fast-rising signals. Its track-and-hold acquisition time is guaranteed ≤250 ns, and aperture jitter is 30 ps typical - enabling high-fidelity sampling of 100 kHz sinusoids with 71 dB SNR and −80 dB THD, as verified in production testing per Analog Devices' Rev. C datasheet.
AD7920BKSZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- 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:
- 1:1
- 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-REEL7 FAQ
1.How can I place an order for AD7920BKSZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7920BKSZ-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 AD7920BKSZ-REEL7 reliable?
The price and inventory of AD7920BKSZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7920BKSZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7920BKSZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7920BKSZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7920BKSZ-REEL7?
AD7920BKSZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7920BKSZ-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 AD7920BKSZ-REEL7?
For technical support, including AD7920BKSZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7920BKSZ-REEL7 requirements.
6.How does Aetrix verify that AD7920BKSZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7920BKSZ-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 AD7920BKSZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7920BKSZ-REEL7?
All AD7920BKSZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7920BKSZ-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 AD7920BKSZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7920BKSZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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