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Texas Instruments ADS7818E/2K5G4
- Part No.:
- ADS7818E/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7818E/2K5G4.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,647
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Product details
Overview
ADS7818E/2K5G4 from Texas Instruments (formerly Burr-Brown) 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), operates from a single +5V supply, and guarantees no missing codes across –40°C to +85°C. It is used in portable spectrum analyzers and battery-powered data loggers requiring high-speed, low-power digitization.
For engineers reviewing the ADS7818E/2K5G4 datasheet, ADS7818E/2K5G4 pinout, ADS7818E/2K5G4 application, or ADS7818E/2K5G4 equivalent, key selection criteria include guaranteed 12-bit no-missing-codes performance, 500kHz sampling rate with 1.625µs conversion time, differential input architecture with ±0.8 LSB DNL, internal reference accuracy (±0.5 LSB INL), and MSOP-8 package compatibility for space-constrained designs.
Technical Context
The ADS7818E/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 via the CONV control line, allowing flexible interface modes including SPI-like gated-clock operation and DSP-synchronous continuous-clock operation.
It features dual reference operation: internal 2.5V bandgap reference (20ppm/°C drift, 2.475–2.525V) or externally overdriven reference (2.0–2.55V), directly scaling full-scale input range from 4.0V to 5.1V. The VREF pin includes a 10kΩ ±30% series resistor and requires 0.1µF ceramic + 2.2µF tantalum bypassing to suppress SAR-induced glitches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with guaranteed no missing codes - ensures monotonic transfer function for precision measurement systems. |
| Throughput Rate | 500kHz maximum - enables real-time acquisition 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 life in portable instrumentation. |
| Analog Input Range | 0 to 5V (unipolar, differential) with +In/–In inputs - supports remote ground sensing and common-mode rejection (70dB DC). |
| Reference Voltage | Internal 2.5V ±0.025V (2.475–2.525V) - provides stable full-scale calibration without external components. |
| Integral Linearity | ±1 LSB max (ADS7818EB grade); ADS7818E/2K5G4 is ±2 LSB - defines end-point accuracy for calibrated sensor interfaces. |
| Supply Voltage | +5V ±5% (4.75–5.25V) - compatible with standard logic rails and eliminates need for dedicated analog supplies. |
Pinout & Package
ADS7818E/2K5G4 is packaged in an MSOP-8 (Package Drawing 337), 3mm × 3mm, 0.65mm pitch, thermally enhanced plastic package rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VREF | Reference output/buffered reference input | Provides or accepts 2.0–2.55V reference; must be bypassed with 0.1µF ceramic + 2.2µF tantalum to suppress SAR switching noise. |
| 2 +In | Non-inverting analog input | Differential input pin; voltage range –0.2V to VCC+0.2V; requires source capable of charging 15pF input capacitance within 350ns acquisition time. |
| 3 –In | Inverting analog input | Remote ground sense point; limited to –0.2V to +0.2V - not for large common-mode signals. |
| 4 GND | Analog/digital ground | Single ground plane required; decoupling caps on +VCC and VREF must connect here with minimal trace inductance. |
| 5 CONV | Asynchronous control input | Starts conversion, controls sample/hold transition (falling edge), selects LSB-first mode, and triggers power-down when held low during 13th clock cycle. |
| 6 DATA | Serial data output | CMOS-level output; transmits 12-bit straight-binary result MSB-first by default; tri-states when CONV goes low during conversion. |
| 7 CLK | Serial clock input | Accepts 200kHz–8MHz clock; duty cycle insensitive; minimum HIGH/LOW time = 50ns; determines conversion speed when synchronized. |
| 8 +VCC | Power supply | +5V supply; requires 0.1µF ceramic + 10µF tantalum decoupling close to pin to maintain PSRR > 1.2 LSB under ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed no missing codes | Ensures monotonicity across full temperature range - essential for closed-loop control and feedback systems where code skipping causes instability. |
| Asynchronous CONV control | Enables deterministic sample initiation independent of clock phase - simplifies trigger-based acquisition in oscilloscopes and event-driven loggers. |
| Configurable serial output format | Supports both MSB-first (default) and LSB-first transmission via CONV timing - matches legacy microcontroller SPI peripherals without bit-reversal firmware overhead. |
| Low-power power-down mode | Reduces quiescent current to 0.5mA (2.5mW) between conversions - extends battery runtime in intermittent-sampling applications like environmental monitors. |
| Dual reference operation | Internal 2.5V reference or external 2.0–2.55V overdrive - allows precise input scaling (e.g., 2.048V → 1mV/LSB) and improved temperature stability with external references. |
Applications
| Portable Spectrum Analyzer Front-End | Battery-Powered Multi-Channel Data Logger |
|---|---|
|
Use Scenario: Digitizing RF downconverted IF signals (up to 247kHz) in handheld field test equipment with real-time FFT processing. IC Role / Device Role / Timing Role: High-speed ADC capturing baseband waveforms; 500kHz throughput enables 4.096ms frame capture for 4096-point FFT. Use Value: 72dB SNR and 78dB SFDR at 100kHz preserve signal integrity for spectral resolution; MSOP-8 footprint minimizes PCB area in compact enclosures. |
Use Scenario: Simultaneous monitoring of 4–8 sensor outputs (thermocouples, strain gauges) in remote industrial nodes powered by Li-ion batteries. IC Role / Device Role / Timing Role: Precision digitizer with differential input rejecting ground loop noise; power-down mode activated between 100ms sampling intervals. Use Value: 2.5mW power-down dissipation extends battery life to >1 year; ±2 LSB INL ensures calibrated accuracy without per-unit trimming. |
| DSP-Based Digital Signal Acquisition | Isolated Remote Data Acquisition System |
|
Use Scenario: Interfacing to TI C6000-series DSPs in real-time motor control or audio processing systems requiring deterministic latency. IC Role / Device Role / Timing Role: Synchronous serial ADC with CONV/CLK alignment; conversion start and data valid edges aligned to DSP clock domain. Use Value: Asynchronous CONV allows jitter-free trigger synchronization; 1.625µs conversion time enables sub-2µs control loop update rates. |
Use Scenario: Digitizing analog sensor signals in hazardous environments using opto-isolated serial interface to host MCU. IC Role / Device Role / Timing Role: Isolation-friendly serial-output ADC; DATA and CLK lines driven through digital isolators with no additional level-shifting. Use Value: CMOS-compatible logic levels (VIH ≥3.0V, VOL ≤0.4V) ensure robust communication across isolation barriers; low EMI design reduces coupling into sensitive analog 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 |
|---|---|---|---|
| ADS7816E/2K5 | 10-bit resolution, 500kHz throughput, same MSOP-8 package and pinout - lower resolution but identical interface and power profile. | Suitable for cost-sensitive applications where 10-bit accuracy suffices (e.g., basic voltage monitoring), not for 12-bit precision requirements. | Select ADS7816E/2K5 only if system SNR and linearity budgets allow 2-bit resolution reduction; no PCB change needed due to pin compatibility. |
| ADS8320E/2K5 | 16-bit resolution, 100kSPS max, SPI-compatible, MSOP-8 - higher resolution but lower speed and different timing protocol (no CONV-asynchronous mode). | Used in high-accuracy static measurements (e.g., precision weigh scales), not for dynamic signal capture above 100kHz. | Choose ADS8320E/2K5 when absolute accuracy >12-bit is mandatory and throughput ≤100kSPS is acceptable; requires firmware adaptation for SPI framing. |
Compared with ADS7818E/2K5, ADS7816E/2K5 trades resolution for cost while retaining identical layout and timing, whereas ADS8320E/2K5 prioritizes precision over speed and mandates interface redesign - making ADS7818E/2K5 the optimal balance for 500kHz, 12-bit, low-power portable acquisition.
Availability
ADS7818E/2K5G4 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and DSP-based signal acquisition systems requiring stable component supply with guaranteed long-term availability.
Supply support for ADS7818E/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
Texas Instruments acquired Burr-Brown in 2000 and maintains its precision analog portfolio, emphasizing high-performance data converters for industrial, medical, and test equipment markets.
The ADS7818E/2K5G4 belongs to TI's legacy high-speed SAR ADC product line, designed specifically for portable, low-power, medium-resolution digitization where size, power, and interface simplicity are critical - not for ultra-high-speed or ultra-high-precision use cases.
FAQ
What is the guaranteed operating temperature range for the ADS7818E/2K5G4?
The ADS7818E/2K5G4 is fully specified and guaranteed over –40°C to +85°C ambient temperature. All key parameters - including integral linearity error (±2 LSB), offset error (±5 LSB), and throughput rate (500kHz) - are validated across this range per the official TI datasheet PDS-1408B. Operation outside this range may cause parametric shift or functional failure.
Does the ADS7818E/2K5G4 require an external clock, and what are the valid frequency limits?
Yes, the ADS7818E/2K5G4 requires an external clock applied to the CLK pin. Valid frequencies range from 200kHz to 8MHz, corresponding to throughput rates from 12.5kHz to 500kHz. The clock duty cycle is not critical, but minimum HIGH and LOW times must each be ≥50ns, and the clock period must be ≥125ns - all verified in the timing table of the ADS7818E/2K5G4 datasheet.
Can the ADS7818E/2K5G4 operate with an external reference voltage, and what is the supported range?
Yes, the ADS7818E/2K5G4 supports external reference voltages applied to the VREF pin. The valid range is 2.0V to 2.55V, which sets the full-scale input span to 4.0V to 5.1V. This is achieved by overdriving the internal 2.5V bandgap reference through a 10kΩ ±30% series resistor - confirmed in the Reference section of the ADS7818E/2K5G4 datasheet.
What is the meaning of "no missing codes" guarantee for the ADS7818E/2K5G4?
The "guaranteed no missing codes" specification for the ADS7818E/2K5G4 means that its 12-bit transfer function is strictly monotonic across the entire input range and temperature range (–40°C to +85°C). No digital output code (0 to 4095) will be skipped regardless of analog input voltage - a critical requirement for control loops and position-sensing applications where code gaps cause instability or mispositioning.
How does the power-down mode work on the ADS7818E/2K5G4, and what is the recovery time?
The ADS7818E/2K5G4 enters power-down mode when the CONV pin is held LOW during conversion and remains LOW at the start of the 13th clock cycle. Recovery occurs on the rising edge of CONV, requiring ≥350ns acquisition time (tACQ) before the next valid conversion - documented in Figure 4 and Table I of the ADS7818E/2K5G4 datasheet. Power dissipation drops from 11mW to 2.5mW in this state.
ADS7818E/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:
- -
ADS7818E/2K5G4 FAQ
1.How can I place an order for ADS7818E/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7818E/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 ADS7818E/2K5G4 reliable?
The price and inventory of ADS7818E/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7818E/2K5G4 is usually 5 days.
3.What payment methods are accepted for ADS7818E/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7818E/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7818E/2K5G4?
ADS7818E/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7818E/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 ADS7818E/2K5G4?
For technical support, including ADS7818E/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7818E/2K5G4 requirements.
6.How does Aetrix verify that ADS7818E/2K5G4 is sourced from the original manufacturer or authorized distributors?
All ADS7818E/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 ADS7818E/2K5G4 meets industry standards.
7.What is the process for return or replacement of ADS7818E/2K5G4?
All ADS7818E/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7818E/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 ADS7818E/2K5G4 part is unused and in its original packaging.
Return procedure for ADS7818E/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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