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Texas Instruments ADS7817EC/250G4
- Part No.:
- ADS7817EC/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7817EC/250G4.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,165
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Product details
Overview
ADS7817EC/250G4 from Texas Instruments is a 12-bit, 200kHz SAR analog-to-digital converter with fully differential high-impedance inputs, 2.3mW power consumption at full rate, ±0.75 LSB differential linearity, and MSOP-8 package - designed for transducer interface in battery-powered remote data acquisition systems.
For engineers reviewing the ADS7817EC/250G4 datasheet, ADS7817EC/250G4 pinout, ADS7817EC/250G4 application, or ADS7817EC/250G4 equivalent, key selection criteria include its micro-power serial interface, reference-voltage-scalable input range (100mV–2.5V), bipolar differential input architecture, and guaranteed no-missing-codes performance across –40°C to +85°C.
Technical Context
The ADS7817EC/250G4 implements a capacitive redistribution successive approximation register (SAR) architecture fabricated in 0.6µm CMOS, enabling 12-bit conversion with 1.5 clock-cycle acquisition time and 12-cycle conversion latency. It requires an external reference and DCLOCK signal, supports binary two's complement output, and uses CS/SHDN for synchronous shutdown control.
Its analog front-end features true differential input with AC common-mode rejection >80dB, input leakage <±1µA, and input capacitance of 15pF. Digital interface operates synchronously via 3-wire serial protocol (CS/SHDN, DCLOCK, DOUT), with data valid on falling DCLOCK edge and MSB-first transmission.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with guaranteed no missing codes. |
| Sampling Rate | 200kHz - supports real-time monitoring of fast-changing sensor signals (e.g., motor current feedback). |
| Power Consumption | 2.3mW at 200kHz - enables multi-hour operation on coin-cell batteries in portable DAQ nodes. |
| Reference Range | 100mV to 2.5V - allows input span tuning from ±49µV to ±1.22mV LSB resolution without hardware change. |
| Differential Linearity | ±0.75 LSB (Grade C) - ensures monotonicity and predictable error bounds for closed-loop control. |
| Supply Voltage | +4.75V to +5.25V - compatible with standard 5V logic rails and regulated industrial supplies. |
| Operating Temperature | –40°C to +85°C - qualified for deployment in outdoor remote sensors and industrial motor drives. |
Pinout & Package
ADS7817EC/250G4 is housed in an 8-pin MSOP package (3.0mm × 3.0mm, 0.65mm pitch), optimized for space-constrained PCB layouts in portable instrumentation and isolated sensing modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VREF | Reference Input | External voltage source setting full-scale input span; impedance >5GΩ when CS = VCC. |
| 2 +In | Non-Inverting Analog Input | Differential input node; accepts ±VREF swing relative to –In; absolute range: –0.3V to +VCC+0.3V. |
| 3 –In | Inverting Analog Input | Differential input node; defines common-mode baseline; absolute range: –0.3V to 4V. |
| 4 GND | Analog Ground | Primary return path for analog circuitry; must be isolated from digital ground to preserve SNR. |
| 5 CS/SHDN | Chip Select / Shutdown Control | Active-low conversion trigger; HIGH forces full power-down mode (3µA max supply current). |
| 6 DOUT | Serial Data Output | MSB-first 12-bit two's complement output; tri-states after data transfer when CS rises. |
| 7 DCLOCK | Data Clock Input | Synchronizes sampling and serial output; supports 10kHz–3.2MHz; min. pulse width 150ns. |
| 8 +VCC | Power Supply | +5V nominal supply; powers internal SAR array, comparator, and serial interface logic. |
Key Features
| Feature | Design Value |
|---|---|
| True Differential Input | Rejects common-mode noise up to 80dB - critical for accurate measurement in EMI-prone motor control environments. |
| Micro-Power Operation | 2.3mW at 200kHz and 3µA shutdown current - extends battery life in wireless sensor nodes by >10× vs legacy 12-bit ADCs. |
| Reference-Voltage Scalability | Full performance maintained from 100mV to 2.5V reference - eliminates need for gain-switching op-amps in multi-range systems. |
| Serial Interface Simplicity | 3-wire synchronous interface with no external timing components - reduces BOM count and layout complexity in space-limited designs. |
| No Missing Codes | Guaranteed over full temperature and supply range - ensures deterministic behavior in safety-critical feedback loops. |
Applications
| Transducer Interface | Battery-Operated Systems |
|---|---|
Use Scenario: Direct connection to strain gauges, thermocouples, or pressure sensors in handheld test equipment. IC Role / Device Role / Timing Role: High-impedance differential front-end digitizing low-level mV-range outputs with minimal signal conditioning. Use Value: Eliminates external instrumentation amplifiers and reference buffers, reducing system power by >15mW and PCB area by 30%. |
Use Scenario: Portable environmental monitors logging temperature/humidity using coin-cell batteries. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated only during measurement bursts, leveraging CS/SHDN for rapid entry/exit from 3µA shutdown. Use Value: Enables >2-year battery life at 1-sample-per-minute duty cycle without compromising 12-bit resolution. |
| Remote Data Acquisition | Isolated Data Acquisition |
Use Scenario: Solar-powered field nodes collecting vibration data from industrial pumps via RS-485 backhaul. IC Role / Device Role / Timing Role: Digitizer interfacing to isolation-capable signal conditioners; operates reliably under wide supply and temperature variation. Use Value: Maintains ±0.75 LSB linearity across –40°C to +85°C, ensuring calibration stability without field recalibration. |
Use Scenario: Medical patient monitors acquiring biopotential signals across reinforced isolation barriers. IC Role / Device Role / Timing Role: ADC placed on isolated side with galvanically separated reference and clock sources. Use Value: Differential input rejects common-mode transients induced across isolation gaps, preserving signal integrity at >80dB CMRR. |
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/250 | 10-bit resolution, 200kHz, same MSOP-8 package, lower power (1.5mW), ±1 LSB DNL | Lower resolution limits dynamic range in precision transducer applications; suitable for cost-sensitive consumer sensors | Select when 10-bit accuracy suffices and BOM cost reduction is prioritized over ENOB |
| ADS8320E/250 | 16-bit resolution, 100kHz, SPI-compatible, higher power (12mW), ±1 LSB DNL, external reference required | Higher resolution but halved throughput; requires additional decoupling due to higher current demand | Select when sub-LSB precision is mandatory and 100kHz sampling meets system timing constraints |
Compared with ADS7817EC/250G4, ADS7816E/250 trades resolution for lower cost and power, while ADS8320E/250 increases resolution at the expense of speed and quiescent current - making ADS7817EC/250G4 the optimal balance for 12-bit, 200kHz, micro-power differential sensing.
Availability
ADS7817EC/250G4 is available at Aetrix Electronics and suitable for transducer interface, battery-operated systems, and remote data acquisition requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial OEM programs.
Supply support for ADS7817EC/250G4 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 is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade IC design.
The ADS7817EC/250G4 belongs to TI's precision SAR ADC product line, engineered specifically for low-power, high-fidelity signal digitization in resource-constrained sensing applications - emphasizing micro-power operation, differential input robustness, and seamless integration with microcontrollers.
FAQ
What is the maximum sampling rate supported by the ADS7817EC/250G4?
The ADS7817EC/250G4 supports a maximum sampling rate of 200kHz, achieved with a 3.2MHz DCLOCK signal (16× oversampling). At this rate, it consumes 2.3mW and maintains full 12-bit performance with ±0.75 LSB differential linearity across –40°C to +85°C. Lower sample rates reduce power linearly, down to 3µA in shutdown mode.
Does the ADS7817EC/250G4 require an external reference voltage?
Yes, the ADS7817EC/250G4 requires an external reference voltage applied to the VREF pin. It operates with reference voltages from 100mV to 2.5V, directly scaling the input full-scale range and LSB size. The reference input presents >5GΩ impedance when CS = VCC, and draws up to 25µA at 200kHz full-scale output.
What package type is used for the ADS7817EC/250G4?
The ADS7817EC/250G4 is packaged in an MSOP-8 (Mini Small Outline Package) with 3.0mm × 3.0mm body size and 0.65mm lead pitch. This compact footprint supports high-density PCB layouts in portable instrumentation and isolated sensing modules where space is constrained.
How does the ADS7817EC/250G4 handle power management?
The ADS7817EC/250G4 implements dual-stage power control: automatic power-down after each conversion (reducing current between samples), and full shutdown when CS/SHDN is driven HIGH (3µA max). Its 2.3mW active power at 200kHz and ultra-low shutdown current make it ideal for duty-cycled battery-powered applications.
Is the ADS7817EC/250G4 pin-compatible with other variants in the ADS7817 family?
Yes, the ADS7817EC/250G4 shares identical pinout and electrical interface with all ADS7817 variants (e.g., ADS7817U, ADS7817P, ADS7817EB), including the MSOP-8, SOIC-8, and PDIP-8 packages. Functionally identical timing, serial protocol, and analog characteristics allow direct substitution within the same package footprint.
ADS7817EC/250G4 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:
- Discontinued at Digi-Key
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- 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:
- External
- 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:
- -
ADS7817EC/250G4 FAQ
1.How can I place an order for ADS7817EC/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7817EC/250G4 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 ADS7817EC/250G4 reliable?
The price and inventory of ADS7817EC/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7817EC/250G4 is usually 5 days.
3.What payment methods are accepted for ADS7817EC/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7817EC/250G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7817EC/250G4?
ADS7817EC/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7817EC/250G4 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 ADS7817EC/250G4?
For technical support, including ADS7817EC/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7817EC/250G4 requirements.
6.How does Aetrix verify that ADS7817EC/250G4 is sourced from the original manufacturer or authorized distributors?
All ADS7817EC/250G4 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 ADS7817EC/250G4 meets industry standards.
7.What is the process for return or replacement of ADS7817EC/250G4?
All ADS7817EC/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7817EC/250G4, 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 ADS7817EC/250G4 part is unused and in its original packaging.
Return procedure for ADS7817EC/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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