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Analog Devices Inc. AD7920BKS-500RL7
- Part No.:
- AD7920BKS-500RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
AD7920BKS-500RL7.pdf
- Description:
- IC ADC 12BIT SRL 250KSPS SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:11,000
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Product details
Overview
AD7920BKS-500RL7 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, no pipeline delay, and SPI-/QSPI-/MICROWIRE-compatible serial interface. It is used in portable medical instruments and battery-powered data acquisition systems requiring high resolution and low power.
For engineers reviewing the AD7920BKS-500RL7 datasheet, AD7920BKS-500RL7 pinout, AD7920BKS-500RL7 application, or AD7920BKS-500RL7 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 SC70 footprint compatibility for space-constrained embedded sensing designs.
Technical Context
The AD7920BKS-500RL7 implements a charge redistribution SAR architecture with an integrated track-and-hold amplifier capable of >13 MHz full-power bandwidth. Conversion is initiated on the falling edge of CS and synchronized to SCLK, requiring 16 clock cycles per sample at 5 MHz.
Its reference is derived directly from VDD, enabling a 0 V to VDD unipolar input range without external reference components. Digital interface timing complies with SPI protocols, supporting microprocessor and DSP interfacing with no latency or pipeline delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete output codes for precision measurement applications |
| Throughput Rate | 250 kSPS - supports real-time sampling of signals up to ~125 kHz Nyquist bandwidth |
| SNR @ 100 kHz | 71 dB min - enables accurate digitization of medium-frequency sensor outputs |
| INL (max) | ±1.5 LSB - ensures monotonicity and <0.037% full-scale linearity error across temperature |
| Supply Range | 2.35 V to 5.25 V - allows direct operation from common Li-ion, 3.3 V, or 5 V rails |
| Standby Current | 1 μA max - reduces average power in duty-cycled sensing nodes |
| Acquisition Time | 250 ns max - permits fast settling after conversion for high-duty-cycle sampling |
Pinout & Package
AD7920BKS-500RL7 is housed in a 6-lead SC70 package (2.0 mm × 1.25 mm × 0.9 mm), optimized for ultra-compact PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Power Supply Input | Single 2.35–5.25 V supply; also serves as internal reference source for full-scale range |
| 2 GND | Analog Ground Reference | Common return for analog circuitry; must be isolated from digital ground to preserve SNR |
| 3 VIN | Analog Input Channel | Single-ended input with 0–VDD range; 20 pF input capacitance requires low-impedance driving |
| 4 SCLK | Serial Clock Input | Controls both data readout timing and internal SAR conversion clock; 10 kHz–5 MHz range |
| 5 SDATA | Serial Data Output | MSB-first 12-bit result preceded by four leading zeros; three-state output controlled by CS |
| 6 CS | Chip Select / Conversion Trigger | Active-low signal that initiates sampling on falling edge and frames serial data transfer |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True one-shot conversion with deterministic 3.2 μs max conversion time and precise sampling control via CS |
| VDD-referenced architecture | Eliminates need for external voltage reference or reference buffer, reducing BOM count and layout area |
| Flexible power management | 1 μA max standby current and dynamic power scaling via SCLK rate enable ultra-low average power in burst-mode operation |
| Wide supply range | Operates down to 2.35 V, supporting direct integration with partially discharged Li-ion batteries (3.0–4.2 V) |
| SPI-compatible interface | Direct connection to standard microcontroller SPI peripherals without level-shifting or protocol translation |
Applications
| Portable Medical Sensors | Battery-Powered DAQ |
|---|---|
Use Scenario: Continuous glucose monitor or wearable ECG front-end acquiring analog biosignals at ≤250 kSPS. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor output with minimal latency and power overhead. Use Value: 12-bit resolution and 71 dB SNR ensure clinical-grade signal fidelity; 1 μA standby current extends device runtime between charges. |
Use Scenario: Handheld environmental logger measuring temperature, humidity, and gas concentration with intermittent sampling. IC Role / Device Role / Timing Role: Low-power, high-accuracy ADC triggered by MCU on demand to minimize active time. Use Value: SC70 footprint saves board space; VDD-referenced design avoids extra reference IC, simplifying calibration and reducing cost. |
| Optical Sensor Interface | Industrial Field Transmitter |
Use Scenario: Optical smoke detector using photodiode current-to-voltage conversion followed by digitization. IC Role / Device Role / Timing Role: Digitizes low-noise transimpedance amplifier output with wide dynamic range and low THD. Use Value: −80 dB THD and 71 dB SNR preserve small-signal integrity; 250 ns acquisition time supports fast optical pulse capture. |
Use Scenario: 4–20 mA loop-powered transmitter digitizing process sensor inputs (e.g., pressure, flow) in harsh environments. IC Role / Device Role / Timing Role: High-accuracy, low-drift ADC operating from limited loop power budget. Use Value: 2.35 V minimum supply enables operation under worst-case loop conditions; ±1.5 LSB INL meets industrial accuracy requirements. |
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-pin SOIC, external reference required, 3.3 V only | Lacks VDD-referenced flexibility; requires additional reference IC and level-shifting for 5 V systems | Choose when existing 3.3 V system already includes precision reference and board area is not constrained |
| MAX11100ETE+ | 12-bit, 500 kSPS, 16-pin TQFN, internal reference, 2.7–3.6 V supply only | Higher speed but narrower supply range; incompatible with 5 V or sub-2.7 V battery operation | Prefer for higher-throughput designs where supply is stable 3.3 V and thermal performance is critical |
Compared with ADS7822U and MAX11100ETE+, the AD7920BKS-500RL7 uniquely combines 250 kSPS throughput, 2.35–5.25 V operation, VDD-referenced simplicity, and SC70 size-making it optimal for compact, multi-rail, battery-sensitive applications where reference integration and footprint are decisive.
Availability
AD7920BKS-500RL7 is available at Aetrix Electronics and suitable for portable medical instruments, battery-powered data acquisition systems, and optical sensor interfaces requiring stable component supply and long-term production continuity.
Supply support for AD7920BKS-500RL7 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 AD79xx family-including AD7920BKS-500RL7-is designed for space- and power-constrained signal acquisition in portable and remote sensing applications, emphasizing integration, low quiescent current, and ease of use without external references.
FAQ
What is the maximum sampling rate supported by the AD7920BKS-500RL7?
The AD7920BKS-500RL7 supports a maximum throughput rate of 250 kSPS, achieved with a 5 MHz SCLK. Its conversion time is fixed at 3.2 μs (16 SCLK cycles), and the minimum quiet time between conversions is 50 ns. This rate is guaranteed across the full −40°C to +85°C temperature range and 2.35 V to 5.25 V supply range.
Does the AD7920BKS-500RL7 require an external voltage reference?
No, the AD7920BKS-500RL7 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 the need for external reference components, simplifies layout, and reduces system cost-though it means full-scale accuracy tracks VDD tolerance and drift.
What package type is used for the AD7920BKS-500RL7?
The AD7920BKS-500RL7 uses a 6-lead SC70 package (2.0 mm × 1.25 mm × 0.9 mm). This ultra-small outline package is specified in the Analog Devices AD7910/AD7920 Rev. C datasheet and is distinct from the optional 8-lead MSOP variant. The SC70 footprint enables high-density PCB designs typical in portable electronics.
How does the AD7920BKS-500RL7 enter and exit power-down mode?
The AD7920BKS-500RL7 enters full power-down mode when CS remains high for more than 20 ns after the end of a conversion cycle. It exits power-down and becomes ready for the next conversion within 1 μs after CS falls, as specified in the timing table. In this mode, supply current drops to 1 μA maximum (typically 50 nA), ideal for duty-cycled sensing.
What is the analog input voltage range of the AD7920BKS-500RL7?
The analog input voltage range of the AD7920BKS-500RL7 is 0 V to VDD, enabled by its internal VDD-referenced architecture. For example, with a 3.3 V supply, the valid input range is 0–3.3 V; with a 5 V supply, it is 0–5 V. Input overvoltage beyond VDD + 0.3 V or below −0.3 V risks damage per absolute maximum ratings.
AD7920BKS-500RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- SPI, DSP
- 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 ~ 85°C
- Supplier Device Package:
- SC-70-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7920BKS-500RL7 FAQ
1.How can I place an order for AD7920BKS-500RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7920BKS-500RL7 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 AD7920BKS-500RL7 reliable?
The price and inventory of AD7920BKS-500RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7920BKS-500RL7 is usually 5 days.
3.What payment methods are accepted for AD7920BKS-500RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7920BKS-500RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7920BKS-500RL7?
AD7920BKS-500RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7920BKS-500RL7 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 AD7920BKS-500RL7?
For technical support, including AD7920BKS-500RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7920BKS-500RL7 requirements.
6.How does Aetrix verify that AD7920BKS-500RL7 is sourced from the original manufacturer or authorized distributors?
All AD7920BKS-500RL7 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 AD7920BKS-500RL7 meets industry standards.
7.What is the process for return or replacement of AD7920BKS-500RL7?
All AD7920BKS-500RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7920BKS-500RL7, 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 AD7920BKS-500RL7 part is unused and in its original packaging.
Return procedure for AD7920BKS-500RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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