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Texas Instruments ADS7818EB/2K5
- Part No.:
- ADS7818EB/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7818EB/2K5.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,279
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Product details
Overview
ADS7818EB/2K5 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 bandgap reference, and synchronous serial interface. It delivers 500kHz throughput at 11mW typical power dissipation, supports differential input (±0.2V on –In), and operates over –40°C to +85°C in MSOP-8. It is used in portable spectrum analyzers and battery-powered data loggers requiring high-speed, low-power digitization.
For engineers reviewing the ADS7818EB/2K5 datasheet, ADS7818EB/2K5 pinout, ADS7818EB/2K5 application, or ADS7818EB/2K5 equivalent, key selection considerations include guaranteed no-missing-codes performance, ±1 LSB integral linearity, external reference overdrive capability (2.0V–2.55V), power-down mode reducing consumption to 2.5mW, and compatibility with microcontroller SPI-like timing control.
Technical Context
The ADS7818EB/2K5 implements a capacitive redistribution SAR architecture fabricated in 0.6µm CMOS, enabling inherent sample/hold functionality without external components. Its conversion is clocked asynchronously to the CONV signal, allowing flexible timing control independent of CLK edges for hold-mode transitions.
It features dual reference operation: internal 2.5V ±20ppm/°C reference (yielding 0–5V input range) or externally overdriven reference (2.0V–2.55V) via a 10kΩ ±30% series resistor. The VREF pin requires 0.1µF ceramic + 2.2µF tantalum bypassing to suppress SAR-induced noise and glitches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonicity and deterministic full-scale behavior across temperature. |
| Throughput Rate | 500kHz maximum - enables real-time sampling of signals up to 350kHz usable bandwidth (SINAD >68dB). |
| Power Dissipation | 11mW at 500kHz; 2.5mW in power-down - supports extended battery life in portable instrumentation. |
| Integral Linearity Error | ±1 LSB (ADS7818EB grade) - limits code-dependent gain error to ≤0.024% FS, critical for precision measurement accuracy. |
| Analog Input Range | 0 to 2×VREF (unipolar); differential input with –In limited to ±0.2V - allows remote ground sensing but not full differential signal rejection. |
| Reference Voltage | Internal 2.475–2.525V (2.5V typ); external overdrive range 2.0–2.55V - enables configurable full-scale spans from 4.0V to 5.1V. |
| Supply Voltage | +5V ±5% (4.75–5.25V) - compatible with standard logic rails and eliminates need for dedicated analog supplies. |
Pinout & Package
ADS7818EB/2K5 is packaged in an MSOP-8 (Package Drawing 337), 3mm × 3mm body, 0.65mm pitch, thermally enhanced for low-noise analog operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference output/buffer input | Provides buffered 2.5V reference; accepts external overdrive (2.0–2.55V); must be bypassed with 0.1µF ceramic + 2.2µF tantalum. |
| +In (Pin 2) | Non-inverting analog input | Accepts 0–5V (with internal ref); voltage must stay within GND–0.2V to VCC+0.2V to maintain linearity. |
| –In (Pin 3) | Inverting analog input | Limited to ±0.2V range; used for remote ground sensing-not for full differential signal acquisition. |
| GND (Pin 4) | Analog/digital ground | Single ground pin; requires low-impedance connection to minimize noise coupling into SAR core. |
| CONV (Pin 5) | Asynchronous control input | Starts conversion, controls sample/hold transition (falling edge), enables LSB-first mode, and triggers power-down. |
| DATA (Pin 6) | Serial data output | 3-state CMOS output; transmits 12-bit straight-binary result MSB-first (or LSB-first if CONV timed per Figure 5). |
| CLK (Pin 7) | Serial clock input | Accepts 200kHz–8MHz clock; duty cycle insensitive; min HIGH/LOW = 50ns; determines conversion speed. |
| +VCC (Pin 8) | Power supply | +5V supply; requires 0.1µF ceramic + 10µF tantalum decoupling close to pin to stabilize internal reference and logic. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed no missing codes | Ensures monotonic transfer function across –40°C to +85°C - essential for closed-loop control and metrology applications. |
| Asynchronous CONV control | Enables precise sample/hold timing independent of CLK, supporting trigger-based acquisition and flexible microcontroller interfacing. |
| Configurable serial output format | Supports both MSB-first (default) and LSB-first transmission via timed CONV assertion - simplifies alignment with legacy DSP firmware. |
| Low-power power-down mode | Reduces quiescent current to 0.5mA (2.5mW), with full recovery in <50ns - ideal for burst-mode sampling in energy-constrained systems. |
| Dual reference operation | Internal 2.5V reference (20ppm/°C drift) or external overdrive (2.0–2.55V) - allows trade-off between simplicity and temperature stability. |
Applications
| Portable Spectrum Analyzer Front-End | Battery-Powered Multi-Channel Data Logger |
|---|---|
Use Scenario: Digitizing RF downconverted IF signals (e.g., 10–250kHz) in handheld field test equipment with limited thermal headroom. IC Role / Device Role / Timing Role: High-speed ADC capturing time-domain waveforms; CONV-triggered acquisition synchronized to sweep generator. Use Value: 500kHz throughput and 72dB SNR enable accurate spectral analysis up to 350kHz; 11mW dissipation prevents thermal drift in sealed enclosures. |
Use Scenario: Simultaneous logging of sensor outputs (temperature, pressure, vibration) in remote environmental monitoring nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-power ADC performing periodic burst sampling; enters power-down between conversions to extend battery life. Use Value: 2.5mW power-down mode and 500kHz capability allow adaptive sampling rates - e.g., 100kHz bursts every 10s yield >1-year battery life. |
| DSP-Based Digital Signal Acquisition | Wireless Communication Baseband Receiver |
Use Scenario: Interfacing to TI C5000/C6000 DSPs in real-time signal processing systems requiring deterministic latency and minimal glue logic. IC Role / Device Role / Timing Role: Serial ADC with CLK-synchronous DATA output; CONV aligned to DSP frame sync for zero-jitter sampling windows. Use Value: Asynchronous CONV/CLK timing eliminates setup/hold violations; MSB-first format matches DSP serial port expectations without bit-reversal overhead. |
Use Scenario: Digitizing baseband I/Q signals in compact 2.4GHz ISM-band transceivers where board space and EMI are critical constraints. IC Role / Device Role / Timing Role: Compact MSOP-8 ADC providing 12-bit resolution for channel estimation and AGC feedback loops. Use Value: Small 3mm × 3mm footprint saves PCB area; internal reference eliminates external ref IC; 70dB CMRR rejects digital noise coupling from nearby RF sections. |
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 | 10-bit resolution, same package/timing/interface; 2.5mW power-down, 250kHz max throughput | Lower resolution and speed; suitable for cost-sensitive sensor readout where 12-bit is unnecessary | Select when system SNR requirements are ≤60dB and sampling rate ≤250kHz - reduces BOM cost without changing layout. |
| ADS8325IBDRBT | 16-bit SAR, 100kSPS, SPI interface, internal 2.5V ref, ±2LSB INL, 3mm × 3mm QFN-10 | Higher resolution but lower speed; different pinout and serial protocol (SPI vs custom CONV/CLK) | Choose for precision DC measurements (e.g., strain gauge bridges) where 16-bit linearity outweighs 5× lower throughput. |
Compared with ADS7818EB/2K5, ADS7816EB/2K5 trades resolution and speed for lower cost and power, while ADS8325IBDRBT provides higher precision at reduced speed and requires PCB redesign due to different pin count, package, and interface protocol.
Availability
ADS7818EB/2K5 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data acquisition, and wireless baseband receiver designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADS7818EB/2K5 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 for industrial and instrumentation markets.
The ADS7818EB/2K5 belongs to Burr-Brown's high-speed, low-power SAR ADC family designed specifically for portable and remote measurement systems where size, power, and AC performance are jointly constrained.
FAQ
What is the guaranteed integral linearity error for ADS7818EB/2K5?
The ADS7818EB/2K5 guarantees ±1 LSB integral linearity error over the full –40°C to +85°C temperature range, as specified in the Package/Ordering Information table for the EB grade. This is tighter than the ±2 LSB spec for the standard E grade and directly impacts measurement accuracy in precision applications like calibrated data loggers.
Can ADS7818EB/2K5 operate with an external reference voltage?
Yes, ADS7818EB/2K5 supports external reference overdrive on the VREF pin within 2.0V to 2.55V. An external source drives through a 10kΩ ±30% internal series resistor, enabling full-scale input ranges from 4.0V to 5.1V. The internal 2.5V reference remains active but is overridden - no disable mechanism is provided.
How does the power-down mode function in ADS7818EB/2K5?
ADS7818EB/2K5 enters power-down mode when CONV is held LOW during conversion and remains LOW at the start of the 13th clock cycle. Power dissipation drops to 2.5mW, and the device resumes full operation within 50ns after CONV goes HIGH. No pipeline delay or invalid conversions occur during entry/exit.
What is the maximum clock frequency supported by ADS7818EB/2K5?
ADS7818EB/2K5 supports a maximum CLK frequency of 8MHz, which corresponds to its 500kHz maximum throughput rate (CLK = 16 × fSAMPLE). Minimum clock period is 125ns; minimum HIGH and LOW times are each 50ns. Clock duty cycle is not specified and may be asymmetric.
Is ADS7818EB/2K5 pin-compatible with ADS7818P or ADS7818PB?
No - ADS7818EB/2K5 uses the MSOP-8 package (337 drawing), while ADS7818P/PB use plastic DIP-8 (006 drawing). Though both share identical pin functions and numbering, the physical dimensions, pitch (0.65mm vs 2.54mm), and thermal characteristics differ significantly; direct PCB replacement is not possible without layout revision.
ADS7818EB/2K5 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/2K5 FAQ
1.How can I place an order for ADS7818EB/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7818EB/2K5 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/2K5 reliable?
The price and inventory of ADS7818EB/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7818EB/2K5 is usually 5 days.
3.What payment methods are accepted for ADS7818EB/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7818EB/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7818EB/2K5?
ADS7818EB/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7818EB/2K5 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/2K5?
For technical support, including ADS7818EB/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7818EB/2K5 requirements.
6.How does Aetrix verify that ADS7818EB/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS7818EB/2K5 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/2K5 meets industry standards.
7.What is the process for return or replacement of ADS7818EB/2K5?
All ADS7818EB/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7818EB/2K5, 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/2K5 part is unused and in its original packaging.
Return procedure for ADS7818EB/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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