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Texas Instruments ADS7817EB/250
- Part No.:
- ADS7817EB/250
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7817EB/250.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:350
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Product details
Overview
ADS7817EB/250 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, ±1 LSB integral linearity (B-grade), and MSOP-8 packaging - designed for transducer interface in battery-powered remote data acquisition systems.
For engineers reviewing the ADS7817EB/250 datasheet, ADS7817EB/250 pinout, ADS7817EB/250 application, or ADS7817EB/250 equivalent, key selection considerations include its true differential input architecture, reference-voltage-scalable resolution (49µV–1.22mV), micro-power shutdown mode (3µA), serial CMOS interface timing, and MSOP-8 thermal performance in –40°C to +85°C industrial environments.
Technical Context
The ADS7817EB/250 implements a capacitive redistribution successive approximation register (SAR) architecture on 0.6µm CMOS, integrating sample-and-hold functionality. It requires an external reference (100mV–2.5V), external clock (10kHz–3.2MHz), and single +5V supply - with conversion time fixed at 12 clock cycles and acquisition time of 1.5 clock cycles.
Its digital interface uses a synchronous 3-wire serial protocol: CS/SHDN initiates conversion and controls shutdown, DCLOCK synchronizes bit transfer on falling edges, and DOUT outputs 12-bit two's complement data MSB-first after one null bit - with no pipeline delay and tri-state capability upon completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes guaranteed - delivers full 12-bit monotonicity across operating range. |
| Sampling Rate | 200kHz maximum throughput - supports real-time monitoring of fast-changing sensor signals. |
| Input Type | Fully differential bipolar input (+In/–In) - rejects common-mode noise up to 80dB and enables direct transducer connection. |
| Reference Range | 100mV to 2.5V externally supplied - sets input span from ±100mV to ±2.5V and LSB size from 49µV to 1.22mV. |
| Power Consumption | 2.3mW at 200kHz (5V supply); drops to 3µA in shutdown - enables multi-year battery life in portable instrumentation. |
| Linearity Error | ±1 LSB integral nonlinearity, ±0.7 LSB differential nonlinearity (B-grade) - ensures <0.025% FSR accuracy for precision measurement. |
| Supply Voltage | +4.75V to +5.25V - compatible with standard 5V logic rails and regulated industrial supplies. |
Pinout & Package
ADS7817EB/250 is housed in an 8-pin MSOP package (3.0mm × 3.0mm × 1.0mm height) with exposed thermal pad, rated for –40°C to +85°C operation and optimized for low-inductance layout in space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference voltage input | Sets full-scale analog input range; accepts 100mV–2.5V; draws 1.3–25µA depending on code and sample rate. |
| +In (Pin 2) | Non-inverting analog input | Accepts voltage from –0.3V to VCC+0.3V; forms differential pair with –In for true bipolar signal acquisition. |
| –In (Pin 3) | Inverting analog input | Accepts voltage from –0.3V to 4V; matched impedance critical to maintain <±1 LSB linearity error vs temperature. |
| GND (Pin 4) | Analog ground reference | Must connect to clean analog ground plane - separate from digital ground to avoid 80dB CMRR degradation. |
| CS/SHDN (Pin 5) | Chip select / shutdown control | Active-low conversion trigger; HIGH forces full analog+digital shutdown (3µA max). |
| DOUT (Pin 6) | Serial data output | Outputs 12-bit two's complement MSB-first after null bit; tri-states when CS goes HIGH post-transfer. |
| DCLOCK (Pin 7) | Data clock input | Synchronizes serial output; falling edge clocks valid data; min pulse width 150ns; duty cycle flexible. |
| +VCC (Pin 8) | Positive power supply | Single 4.75–5.25V supply; requires local 0.1µF ceramic bypass placed within 2mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| True differential input architecture | Enables rejection of common-mode interference in noisy industrial environments without external instrumentation amplifiers. |
| Micro-power shutdown mode | Reduces current to ≤3µA during idle periods - critical for energy harvesting and long-life battery systems. |
| Reference-voltage scalable resolution | Allows trade-off between dynamic range and quantization noise: 1.22mV LSB at 2.5V ref vs 49µV at 100mV ref. |
| Serial CMOS interface with null-bit framing | Eliminates need for frame synchronization logic; simplifies FPGA/microcontroller firmware integration. |
| High input impedance (>1GΩ in hold mode) | Permits direct connection to high-output-impedance sensors (e.g., piezoresistive bridges, thermopiles) without buffer op-amps. |
Applications
| Transducer Interface | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Direct digitization of millivolt-level outputs from strain gauges, pressure sensors, and thermocouples in field-deployable equipment. IC Role / Device Role / Timing Role: Primary A/D converter acquiring synchronized differential samples at up to 200kHz with minimal external components. Use Value: Eliminates signal conditioning stages by accepting ±100mV–±2.5V inputs directly, reducing BOM count and board area by >30%. |
Use Scenario: Multi-channel environmental monitoring in solar-powered remote nodes with 10+ year battery life requirements. IC Role / Device Role / Timing Role: Low-duty-cycle sampling ADC that spends >99% of time in 3µA shutdown mode between 1–10Hz acquisitions. Use Value: Achieves sub-10µW average power per channel - enabling 12-bit resolution without compromising runtime or battery size. |
| Isolated Sensor Front-Ends | AC Motor Current Monitoring |
Use Scenario: Digitizing current/voltage feedback signals across opto- or magnetic isolation barriers in industrial drives and PLC I/O modules. IC Role / Device Role / Timing Role: Isolation-side ADC interfacing with isolated DC-DC converters and digital isolators via 3-wire SPI-like bus. Use Value: Differential input rejects ground-loop noise induced across isolation gaps; 80dB CMRR maintains accuracy despite >1kV common-mode transients. |
Use Scenario: Real-time phase current sampling in vector-controlled inverters for HVAC compressors and servo drives. IC Role / Device Role / Timing Role: High-speed sampling ADC capturing three-phase currents with precise inter-channel timing alignment. Use Value: 12-bit resolution at 200kHz supports <1% torque ripple control; MSOP-8 footprint allows dense placement near gate drivers and shunt resistors. |
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 | 10-bit resolution, 200kHz, same MSOP-8 package and pinout - lower resolution but improved SNR at low input ranges. | Lower-cost systems where 10-bit accuracy suffices (e.g., basic threshold detection, non-critical monitoring). | Select when resolution requirement is ≤10 bits and system cost sensitivity outweighs need for 12-bit fidelity. |
| ADS8325IBDBR | 16-bit, 100kSPS, SPI interface, internal reference - higher resolution but slower, larger SOIC-8 package, and 3.3V-only supply. | High-precision lab equipment requiring <0.0015% FSR accuracy and integrated reference stability. | Select only when 16-bit ENOB is mandatory and 100kSPS sampling meets real-time control latency budgets. |
Compared with ADS7817EB/250, ADS7816EB/250 trades resolution for lower cost and slightly better noise floor at small signals, while ADS8325IBDBR provides four extra bits at half the speed and incompatible voltage/logic domain - making ADS7817EB/250 the optimal balance of speed, resolution, power, and 5V compatibility for industrial sensor interfaces.
Availability
ADS7817EB/250 is available at Aetrix Electronics and suitable for transducer interface, battery-powered data loggers, isolated sensor front-ends, and AC motor current monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS7817EB/250 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, embedded processing, and connectivity technologies - with over 50 years of innovation in precision data converters and industrial signal chains.
The ADS7817EB/250 belongs to TI's precision SAR ADC product line, engineered specifically for low-power, high-fidelity sensor digitization in harsh industrial and portable environments - emphasizing differential input integrity, reference flexibility, and robust serial interface timing.
FAQ
What is the minimum reference voltage supported by the ADS7817EB/250?
The ADS7817EB/250 supports an external reference voltage ranging from 100mV to 2.5V. At 100mV, the LSB size is 49µV and effective number of bits degrades due to increased relative noise contribution - requiring careful layout, low-noise references, and possibly oversampling to maintain accuracy. Operation below 100mV is not specified and may violate absolute maximum ratings.
Does the ADS7817EB/250 require an external clock source?
Yes, the ADS7817EB/250 requires an external DCLOCK signal for serial data transfer and conversion timing. The clock frequency can range from 10kHz to 3.2MHz, with minimum high/low times of 150ns. No internal oscillator is present - all timing is slave to the applied DCLOCK, and the device does not generate clocks autonomously.
How does the CS/SHDN pin function in the ADS7817EB/250?
In the ADS7817EB/250, the CS/SHDN pin serves dual functions: when pulled LOW, it enables conversion and serial output; when HIGH, it places the device into full shutdown mode drawing ≤3µA. Unlike partial sleep modes, this disables both analog and digital sections - making it essential for ultra-low-power duty-cycled operation in battery systems.
What is the meaning of "B-grade" in ADS7817EB/250's part number?
The "B" suffix in ADS7817EB/250 denotes the performance grade: ±1 LSB integral linearity error and ±0.7 LSB differential linearity error over –40°C to +85°C. This is tighter than the base "A-grade" (±2 LSB INL/DNL) and confirms the device meets enhanced linearity specifications required for precision measurement applications.
Can the ADS7817EB/250 interface directly with a 3.3V microcontroller?
The ADS7817EB/250 operates from a 4.75–5.25V supply and its digital I/O (CS/SHDN, DCLOCK, DOUT) are CMOS-compatible with VIH ≥3V and VIL ≤0.8V - so direct interface with 3.3V microcontrollers is possible only if the MCU inputs tolerate 5V and outputs meet ADS7817EB/250's VIH minimum. Level-shifting is recommended for reliable 3.3V↔5V communication.
ADS7817EB/250 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):
- 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:
- -
ADS7817EB/250 FAQ
1.How can I place an order for ADS7817EB/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7817EB/250 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 ADS7817EB/250 reliable?
The price and inventory of ADS7817EB/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7817EB/250 is usually 5 days.
3.What payment methods are accepted for ADS7817EB/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7817EB/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7817EB/250?
ADS7817EB/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7817EB/250 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 ADS7817EB/250?
For technical support, including ADS7817EB/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7817EB/250 requirements.
6.How does Aetrix verify that ADS7817EB/250 is sourced from the original manufacturer or authorized distributors?
All ADS7817EB/250 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 ADS7817EB/250 meets industry standards.
7.What is the process for return or replacement of ADS7817EB/250?
All ADS7817EB/250 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7817EB/250, 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 ADS7817EB/250 part is unused and in its original packaging.
Return procedure for ADS7817EB/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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