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Texas Instruments ADS7818E/2K5
- Part No.:
- ADS7818E/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7818E/2K5.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,297
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Product details
Overview
ADS7818E/2K5 from Burr-Brown (now Texas Instruments) is a 12-bit successive approximation register (SAR) analog-to-digital converter with integrated 2.5V reference, differential input, and synchronous serial interface. It delivers 500kHz throughput at 11mW, operates from a single +5V supply, and guarantees no missing codes across –40°C to +85°C - ideal for portable spectrum analyzers and battery-powered data loggers.
For engineers reviewing the ADS7818E/2K5 datasheet, ADS7818E/2K5 pinout, ADS7818E/2K5 application, or ADS7818E/2K5 equivalent, key selection considerations include its MSOP-8 package, 350ns acquisition time, ±1 LSB integral linearity (EB grade), unipolar 0–5V input range with internal reference, and power-down mode reducing current to 0.5mA.
Technical Context
The ADS7818E/2K5 implements a capacitive redistribution SAR architecture with on-chip sample/hold and buffered 2.5V bandgap reference. Its conversion timing is asynchronous to CLK but synchronized to CONV falling edge, enabling flexible interface modes including LSB-first serial output and short-cycle termination.
It supports both internal reference (2.475–2.525V, 20ppm/°C drift) and external reference overdrive (2.0–2.55V), with VREF pin buffered via 10kΩ series resistor (±30% tolerance). Input full-scale span is precisely defined as (+In – –In), with –In limited to ±0.2V for remote ground sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with guaranteed no missing codes - ensures monotonicity critical for closed-loop control and 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 - extends battery life in portable instrumentation. |
| Analog Input Range | 0 to 5V (with internal 2.5V ref); supports external reference 2.0–2.55V for 4.0–5.1V span - allows LSB = 1mV with 2.048V reference. |
| Integral Linearity | ±1 LSB (ADS7818EB grade) - meets requirements for high-fidelity signal capture in DSP front-ends. |
| Acquisition Time | 350ns - defines minimum sample period; requires source impedance low enough to settle 12-bit level within this window. |
| Reference Drift | 20ppm/°C - contributes ~1 LSB full-scale drift per 12°C; external low-drift reference needed for metrology-grade stability. |
Pinout & Package
ADS7818E/2K5 is packaged in an MSOP-8 (Package Drawing 337), 3mm × 3mm, 0.65mm pitch, thermally enhanced plastic body rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference output/buffered voltage node | Provides 2.5V internal reference; accepts external 2.0–2.55V overdrive; must be bypassed with 0.1µF ceramic + 2.2µF tantalum. |
| +In (Pin 2) | Non-inverting analog input | Differential input node; valid range GND–0.2V to VCC+0.2V; drives internal hold capacitor during acquisition. |
| –In (Pin 3) | Inverting analog input | Remote ground sense point; restricted to ±0.2V - not for large common-mode rejection. |
| GND (Pin 4) | Analog/digital ground reference | Single ground plane required; decoupling caps tied here for VREF and +VCC. |
| CONV (Pin 5) | Asynchronous control input | Starts conversion, selects sample/hold mode, triggers power-down, and configures LSB-first serial output. |
| DATA (Pin 6) | Serial data output | 3-state CMOS output; transmits 12-bit straight binary MSB-first by default; tri-states when CONV goes low. |
| 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 input | +5V ±5% supply; requires 0.1µF ceramic + 10µF tantalum decoupling close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.5V reference | Eliminates external reference IC; calibrated to ±2.5mV (±0.1%) at 25°C with 20ppm/°C drift - reduces BOM count and layout area. |
| Asynchronous CONV control | Decouples conversion initiation from clock timing - enables trigger-based sampling and deterministic latency in microcontroller interfaces. |
| Power-down mode | Reduces supply current from 2.2mA to 0.5mA between conversions - cuts average power >75% at 100kHz sample rate. |
| Differential input architecture | Supports true differential signal capture with 70dB DC CMRR; –In pin optimized for remote ground sensing, not wide common-mode rejection. |
| LSB-first serial option | Configurable via CONV timing during 13th clock cycle - simplifies alignment with legacy SPI peripherals requiring LSB-first bit order. |
Applications
| Portable Spectrum Analyzer Front-End | Battery-Powered Multi-Channel Data Logger |
|---|---|
Use Scenario: Real-time RF signal digitization in handheld field test equipment with tight power budget and space constraints. IC Role / Device Role / Timing Role: Primary ADC capturing baseband I/Q signals at up to 500kHz; provides serial output compatible with low-pin-count microcontrollers. Use Value: 72dB SNR and 72dB SFDR at 100kHz enable accurate spectral analysis; 11mW dissipation extends battery runtime without active cooling. | Use Scenario: Simultaneous monitoring of multiple sensor outputs (temperature, pressure, voltage) in remote environmental stations. IC Role / Device Role / Timing Role: High-precision, low-power ADC interfaced to MSP430 or similar ultra-low-power MCU via SPI-compatible serial bus. Use Value: Power-down mode reduces average current to <1mA at 10Hz sampling; MSOP-8 footprint minimizes PCB area in multi-channel designs. |
| DSP-Based Digital Signal Acquisition | Wireless Communication Transceiver Monitoring |
Use Scenario: Analog front-end for TI C5000/C6000 DSPs in industrial control and audio processing systems. IC Role / Device Role / Timing Role: Synchronous serial ADC tightly coupled to DSP's McBSP port; leverages CONV/CLK timing flexibility for deterministic latency. Use Value: 350ns acquisition time and 1.625µs conversion enable sub-microsecond loop closure; no missing codes ensure stable PID controller behavior. | Use Scenario: On-board RF power amplifier and antenna SWR monitoring in cellular IoT modules. IC Role / Device Role / Timing Role: Precision ADC measuring DC bias voltages and detector outputs; operates from same +5V rail as PA driver stages. Use Value: Internal 2.5V reference eliminates need for separate voltage reference IC; ±1 LSB INL ensures accurate calibration of transmit chain gain. |
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/250 | 12-bit, 200kHz max throughput; identical MSOP-8 package and pinout; ±1 LSB INL; no internal reference - requires external 2.5V ref. | Suitable where lower speed suffices and system already provides precision reference; higher noise floor limits dynamic range. | Select ADS7816EB/250 only if reference sharing across multiple ADCs reduces cost/complexity and 200kHz sample rate meets system requirements. |
| ADS8320E/250 | 16-bit, 100kHz max throughput; SPI-compatible serial interface; MSOP-8; external reference only; 92dB SNR. | Used where resolution >12-bit is mandatory (e.g., precision sensor conditioning), accepting lower speed and higher cost. | Choose ADS8320E/250 when absolute accuracy and noise performance outweigh throughput needs - not a drop-in replacement due to resolution/speed trade-off. |
Compared with ADS7818E/2K5, ADS7816EB/250 trades throughput and integrated reference for lower cost and shared reference architecture, while ADS8320E/250 sacrifices speed and adds complexity to achieve 4 extra bits of resolution - making ADS7818E/2K5 optimal for balanced 12-bit, 500kHz, self-contained applications.
Availability
ADS7818E/2K5 is available at Aetrix Electronics and suitable for portable instrumentation, wireless infrastructure monitoring, and industrial data acquisition requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for ADS7818E/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 high-precision analog ICs including data converters, amplifiers, and references.
The ADS7818E/2K5 belongs to Burr-Brown's high-speed, low-power SAR ADC product line designed for portable and battery-operated measurement systems demanding integration, accuracy, and minimal power.
FAQ
What is the guaranteed integral linearity error for ADS7818E/2K5?
The ADS7818E/2K5 is the standard-grade version with ±2 LSB integral linearity error over temperature. Note that the ADS7818EB/2K5 variant offers tighter ±1 LSB specification. Both grades guarantee no missing codes across –40°C to +85°C, but only the EB grade meets the ±1 LSB INL limit stated in the datasheet's "SPECIFICATIONS" table under "ADS7818EB" column.
Can ADS7818E/2K5 operate with an external reference voltage?
Yes, ADS7818E/2K5 supports external reference overdrive on the VREF pin within 2.0V to 2.55V. The internal 2.5V reference is connected via a 10kΩ series resistor (±30%), allowing clean external voltage injection. This enables custom full-scale ranges (e.g., 0–4.095V with 2.048V reference) and improved temperature stability when using a low-drift external reference.
What package type does ADS7818E/2K5 use, and is it RoHS compliant?
ADS7818E/2K5 uses the MSOP-8 package (Package Drawing 337), 3mm × 3mm body, 0.65mm lead pitch. As a pre-2006 Burr-Brown part, original production was lead-based; however, Texas Instruments' current manufacturing and reeling of ADS7818E/2K5 complies with RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 1 marking for lead-free finish.
How does the power-down mode function in ADS7818E/2K5?
ADS7818E/2K5 enters power-down mode when CONV remains LOW during conversion and stays LOW at the start of the 13th clock cycle. This reduces quiescent current from 2.2mA to 0.5mA. Full functionality resumes on the next CONV rising edge, with no pipeline delay - the first conversion after wake-up is valid and complete.
Is ADS7818E/2K5 pin-compatible with ADS7818P or ADS7818PB?
Yes, ADS7818E/2K5 shares identical pinout with ADS7818P (plastic DIP-8) and ADS7818PB (DIP-8, ±1 LSB grade), as confirmed by the "PIN CONFIGURATION" diagrams and "PACKAGE/ORDERING INFORMATION" table. All variants use the same 8-pin functional assignment: VREF, +In, –In, GND, CONV, DATA, CLK, +VCC - enabling direct socket replacement when changing packages or grades.
ADS7818E/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:
- -
ADS7818E/2K5 FAQ
1.How can I place an order for ADS7818E/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7818E/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 ADS7818E/2K5 reliable?
The price and inventory of ADS7818E/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7818E/2K5 is usually 5 days.
3.What payment methods are accepted for ADS7818E/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7818E/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7818E/2K5?
ADS7818E/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7818E/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 ADS7818E/2K5?
For technical support, including ADS7818E/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7818E/2K5 requirements.
6.How does Aetrix verify that ADS7818E/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS7818E/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 ADS7818E/2K5 meets industry standards.
7.What is the process for return or replacement of ADS7818E/2K5?
All ADS7818E/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7818E/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 ADS7818E/2K5 part is unused and in its original packaging.
Return procedure for ADS7818E/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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