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Texas Instruments ADS7818EB/2K5G4
- Part No.:
- ADS7818EB/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7818EB/2K5G4.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,348
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Product details
Overview
ADS7818EB/2K5G4 from Burr-Brown (now Texas Instruments) is a 12-bit successive approximation register (SAR) analog-to-digital converter with integrated sample/hold, internal 2.5V reference, and synchronous serial interface. It delivers 500kHz throughput at 11mW, supports differential input (0–5V range), and operates from a single +5V supply across –40°C to +85°C. It is used in portable spectrum analyzers and remote data acquisition systems requiring low power and isolation.
For engineers reviewing the ADS7818EB/2K5G4 datasheet, ADS7818EB/2K5G4 pinout, ADS7818EB/2K5G4 application, or ADS7818EB/2K5G4 equivalent, key selection considerations include guaranteed no-missing-codes performance, ±1 LSB integral linearity, MSOP-8 package compatibility, external reference overdrive capability (2.0–2.55V), and power-down mode reducing dissipation to 2.5mW.
Technical Context
The ADS7818EB/2K5G4 implements a capacitive redistribution SAR architecture fabricated in 0.6µm CMOS, enabling inherent sample/hold functionality without external components. Its conversion timing is asynchronous to CLK-initiated by CONV falling edge-and supports both MSB-first and LSB-first serial output via controlled CONV sequencing.
It features an internal 2.5V bandgap reference buffered to drive the capacitor DAC, with a 10kΩ ±30% series resistor allowing external reference overdrive. Input full-scale span is set by VREF voltage, yielding 0–5V (internal) or 4.0–5.1V (external) unipolar ranges, while analog inputs tolerate –0.2V to VCC+0.2V with >1GΩ hold-mode impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with guaranteed no missing codes-ensures monotonic transfer function for precision measurement. |
| Throughput Rate | 500kHz maximum-enables real-time sampling of signals up to 350kHz usable bandwidth (SINAD >68dB). |
| Power Dissipation | 11mW at 500kHz; drops to 2.5mW in power-down mode-critical for battery-operated wireless sensors. |
| Analog Input Range | 0 to 5V (with internal 2.5V ref); extends to 4.0–5.1V with external 2.0–2.55V reference-supports flexible signal scaling. |
| Integral Linearity | ±1 LSB max-meets requirements for high-fidelity digitization in instrumentation-grade applications. |
| Reference Drift | 20ppm/°C (internal)-translates to ~1 LSB full-scale drift per 12°C, necessitating external ref for tighter thermal stability. |
| Supply Voltage | +4.75V to +5.25V-compatible with standard 5V logic rails and tolerant of ±5% regulation variation. |
Pinout & Package
ADS7818EB/2K5G4 is packaged in an MSOP-8 surface-mount package (drawing 337), 3mm × 3mm footprint, 0.65mm pitch, with exposed thermal pad. Pin assignments are identical to the ADS7818E family and validated per official Burr-Brown datasheet PDS-1408B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference output/input | Provides or accepts 2.0–2.55V reference; must be bypassed with 0.1µF ceramic + 2.2µF tantalum caps to suppress SAR switching noise. |
| +In (Pin 2) | Non-inverting analog input | Differential input node; accepts 0–5V (or 4.0–5.1V) signal; requires source capable of charging 15pF within 350ns acquisition time. |
| –In (Pin 3) | Inverting analog input | Remote ground sense point; limited to –0.2V to +0.2V-used for common-mode rejection of small offsets near signal source. |
| GND (Pin 4) | Analog/digital ground | Common return for analog and digital sections; requires low-impedance connection to minimize noise coupling. |
| CONV (Pin 5) | Convert control input | Asynchronous command pin: falling edge initiates hold/conversion; timing relative to CLK determines LSB-first mode or power-down entry. |
| DATA (Pin 6) | Serial data output | CMOS-level 12-bit output, MSB-first by default; tri-states when CONV goes LOW-enables bus sharing and isolation. |
| CLK (Pin 7) | Serial clock input | Accepts 200kHz–8MHz clock; duty cycle insensitive if tCKH/tCKL ≥50ns; defines conversion speed and serial bit rate. |
| +VCC (Pin 8) | Power supply | +5V supply; requires local decoupling with 0.1µF ceramic + 10µF tantalum to maintain PSRR >1.2 LSB under ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed no missing codes | Ensures monotonicity across full 12-bit range-eliminates code ambiguities in closed-loop control and calibration systems. |
| Differential input architecture | Enables remote ground sensing via –In pin, reducing noise pickup in long-sensor wiring typical in industrial data loggers. |
| Internal 2.5V reference with overdrive | Allows seamless transition between internal convenience and external precision-no external buffer needed for 2.0–2.55V references. |
| Asynchronous CONV/CLK interface | Decouples sampling trigger from clock domain-simplifies synchronization with microcontrollers or event-driven triggers. |
| Power-down mode with instant wake-up | Reduces current to 0.5mA (2.5mW) between conversions; first conversion after wake-up is fully valid-no latency penalty. |
Applications
| Portable Spectrum Analyzer Front-End | Wireless Sensor Node ADC |
|---|---|
Use Scenario: Digitizing RF IF signals (up to 247kHz) in handheld spectrum analyzers with battery life constraints. IC Role / Device Role / Timing Role: Primary SAR ADC capturing baseband I/Q samples; synchronized to DSP clock via CONV/CLK handshake. Use Value: 72dB SNR and 75dB SFDR at 100kHz enable accurate spectral resolution; 11mW dissipation extends runtime on Li-ion cells. | Use Scenario: Remote environmental monitoring using low-power MCU with SPI-like interface and intermittent wake-up. IC Role / Device Role / Timing Role: Standalone ADC triggered by MCU GPIO (CONV), clocked only during active sampling to minimize energy use. Use Value: Power-down mode cuts average current to <1µA between 100ms samples; MSOP-8 footprint saves PCB area in compact nodes. |
| Isolated Data Acquisition Channel | DSP-Based Digital Signal Processing Interface |
Use Scenario: High-voltage industrial sensor interfacing where galvanic isolation is required between field and controller. IC Role / Device Role / Timing Role: ADC placed on isolated side; serial DATA/CLK lines coupled via optocouplers or digital isolators. Use Value: Synchronous serial interface eliminates parallel bus complexity; CMOS logic levels simplify level-shifting across isolation barriers. | Use Scenario: Real-time motor control loop where ADC results feed into TI C2000 DSP for PWM update within tight timing windows. IC Role / Device Role / Timing Role: High-speed peripheral connected directly to DSP's serial port; CONV tied to timer output for deterministic sampling. Use Value: 1.625µs conversion time + zero pipeline delay ensures sampled value aligns precisely with control algorithm execution cycle. |
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 |
|---|---|---|---|
| ADS7816EB/2K5 | 12-bit, 250kHz max throughput; 7mW at 250kHz; same MSOP-8 package and pinout. | Lower speed and power-suited for slower data loggers where 500kHz is unnecessary. | Select ADS7816EB/2K5 only if system sampling requirement is ≤250kHz and lower quiescent current is prioritized. |
| ADS8320EB/250 | 16-bit, 100kHz max throughput; SPI-compatible; 12mW at 100kHz; MSOP-8 package. | Higher resolution but lower speed-used where precision outweighs bandwidth, e.g., strain gauge readouts. | Choose ADS8320EB/250 when 16-bit resolution is mandatory and 100kHz sampling suffices; not drop-in due to different timing and command protocol. |
Compared with ADS7818EB/2K5G4, ADS7816EB/2K5 offers lower power at reduced speed, while ADS8320EB/250 trades speed for resolution-neither is pin-compatible, and both require firmware and layout adjustments for integration.
Availability
ADS7818EB/2K5G4 is available at Aetrix Electronics and suitable for portable instrumentation, wireless sensor networks, isolated industrial DAQ, and DSP-based control systems requiring stable component supply and long-term manufacturability.
Supply support for ADS7818EB/2K5G4 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
Burr-Brown Corporation, acquired by Texas Instruments in 2000, specialized in precision analog ICs including data converters, amplifiers, and references.
The ADS7818EB/2K5G4 belongs to Burr-Brown's high-speed, low-power SAR ADC product line, designed specifically for battery-powered test equipment and distributed sensing systems demanding accuracy, small size, and serial interface simplicity.
FAQ
What is the maximum clock frequency supported by the ADS7818EB/2K5G4?
The ADS7818EB/2K5G4 supports a maximum clock frequency of 8MHz, which enables its rated 500kHz throughput rate (fCLK = 16 × fSAMPLE). Minimum clock period is 125ns, with minimum HIGH and LOW times of 50ns each. Operation below 200kHz is also valid but reduces throughput proportionally.
Does the ADS7818EB/2K5G4 require external decoupling capacitors, and if so, what values?
Yes, the ADS7818EB/2K5G4 requires specific decoupling: +VCC must be bypassed with a 0.1µF ceramic capacitor and a 10µF tantalum capacitor; VREF requires a 0.1µF ceramic capacitor placed as close as possible to the pin, plus a 2.2µF tantalum capacitor in parallel. These values are specified in the official datasheet to suppress switching noise and ensure reference stability.
Can the ADS7818EB/2K5G4 operate with an external reference voltage, and what is the acceptable range?
Yes, the ADS7818EB/2K5G4 supports external reference voltages applied to the VREF pin. The valid range is 2.0V to 2.55V, corresponding to an analog input full-scale span of 4.0V to 5.1V. This overdrive capability is enabled by an internal 10kΩ ±30% series resistor connecting the internal bandgap to VREF.
What does "guaranteed no missing codes" mean for the ADS7818EB/2K5G4, and why is it important?
"Guaranteed no missing codes" means the ADS7818EB/2K5G4's transfer function is strictly monotonic across its entire 12-bit range-every integer code from 0 to 4095 appears for some input voltage. This is critical in closed-loop control, calibration routines, and metrology applications where code gaps could cause instability or erroneous decisions.
How does the power-down mode of the ADS7818EB/2K5G4 work, and what is its recovery time?
The ADS7818EB/2K5G4 enters power-down mode when CONV remains LOW during conversion and stays LOW at the start of the 13th clock cycle. Recovery is immediate: the first conversion after CONV goes HIGH is fully valid, with no additional delay. Quiescent current drops from 2.2mA to 0.5mA (2.5mW), and full functionality resumes within one acquisition time (350ns).
ADS7818EB/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-VSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7818EB/2K5G4 FAQ
1.How can I place an order for ADS7818EB/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7818EB/2K5G4 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 ADS7818EB/2K5G4 reliable?
The price and inventory of ADS7818EB/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7818EB/2K5G4 is usually 5 days.
3.What payment methods are accepted for ADS7818EB/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7818EB/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7818EB/2K5G4?
ADS7818EB/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7818EB/2K5G4 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 ADS7818EB/2K5G4?
For technical support, including ADS7818EB/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7818EB/2K5G4 requirements.
6.How does Aetrix verify that ADS7818EB/2K5G4 is sourced from the original manufacturer or authorized distributors?
All ADS7818EB/2K5G4 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 ADS7818EB/2K5G4 meets industry standards.
7.What is the process for return or replacement of ADS7818EB/2K5G4?
All ADS7818EB/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7818EB/2K5G4, 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 ADS7818EB/2K5G4 part is unused and in its original packaging.
Return procedure for ADS7818EB/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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