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Texas Instruments ADS7817E/250
- Part No.:
- ADS7817E/250
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7817E/250.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
ADS7817E/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, ±2 LSB integral linearity, and MSOP-8 package - designed for transducer interface in battery-powered remote data acquisition systems.
For engineers reviewing the ADS7817E/250 datasheet, ADS7817E/250 pinout, ADS7817E/250 application, or ADS7817E/250 equivalent, key selection factors include its micro-power serial interface, reference-voltage-scalable input resolution (49µV–1.22mV), bipolar differential input range, and shutdown current of ≤3µA - all critical for low-noise, isolated, or multi-channel sensing designs.
Technical Context
The ADS7817E/250 implements a capacitive redistribution successive approximation register (SAR) architecture on 0.6µm CMOS, integrating sample-and-hold functionality without external components. It requires only an external reference (100mV–2.5V), single +5V supply, and asynchronous DCLOCK signal.
Its digital interface uses a 3-wire synchronous serial protocol: CS/SHDN initiates conversion and controls power-down mode; DOUT outputs 12-bit two's complement data MSB-first on falling DCLOCK edges; timing supports throughput from 625Hz to 200kHz with 12-clock-cycle conversion time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precision measurement of small-signal transducers. |
| Sampling Rate | 200kHz - enables real-time capture of signals up to 100kHz (Nyquist-limited), suitable for motor control feedback loops. |
| Input Type | Fully differential bipolar - accepts ±VREF span with common-mode rejection >80dB, eliminating need for external level-shifting circuitry. |
| Power Consumption | 2.3mW at 200kHz - enables continuous operation in energy-constrained portable instrumentation without thermal derating. |
| Shutdown Current | ≤3µA - reduces system standby power by >99% versus active mode, critical for wake-on-event sensor nodes. |
| Reference Range | 100mV to 2.5V - allows trade-off between resolution (49µV LSB at 100mV) and noise immunity (1.22mV LSB at 2.5V). |
| INL / DNL | ±2 LSB max - ensures monotonicity and predictable error bounds across full temperature range (–40°C to +85°C). |
Pinout & Package
ADS7817E/250 is housed in an MSOP-8 package (3.0mm × 4.9mm, 0.65mm pitch), optimized for space-constrained PCB layouts in portable and isolated measurement systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Reference Input | Accepts external 100mV–2.5V reference; sets full-scale input span and LSB weight; draws up to 25µA at 200kHz. |
| +In | Non-Inverting Analog Input | Differential input node; voltage range –0.3V to VCC+0.3V; 15pF input capacitance requires matched source impedance for <±2 LSB linearity error. |
| –In | Inverting Analog Input | Differential input node; voltage range –0.3V to 4V; common-mode voltage must stay within limits defined by VREF to maintain specification compliance. |
| GND | Analog Ground | Low-impedance return path for analog circuitry; must be separated from digital ground to prevent noise coupling into conversion result. |
| CS/SHDN | Chip Select / Shutdown Control | Active-low conversion trigger; HIGH forces full power-down (digital + analog sections disabled); timing-critical for short-cycling to reduce power. |
| DOUT | Serial Data Output | 3-state CMOS output; delivers 12-bit two's complement code MSB-first; valid on falling DCLOCK edge; tri-states when CS goes HIGH. |
| DCLOCK | Data Clock Input | Asynchronous clock (10kHz–3.2MHz); determines conversion speed and serial bit timing; minimum high/low pulse width ≥150ns. |
| +VCC | Power Supply | +4.75V to +5.25V supply; powers internal analog and digital blocks; requires local 0.1µF ceramic bypass capacitor adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Micro-power SAR architecture | Enables 200kHz sampling at just 2.3mW - eliminates need for thermal management in sealed enclosures or wearable devices. |
| True differential input with AC common-mode rejection | Rejects >80dB of noise coupled equally onto +In and –In - essential for accurate measurements in electrically noisy motor drive or industrial environments. |
| Reference-scalable resolution | LSB size adjusts from 49µV (100mV ref) to 1.22mV (2.5V ref), allowing optimization of dynamic range vs. quantization noise per application requirement. |
| Short-cycling capability via CS control | Allows early termination of conversion after any bit - reduces average power by >50% in threshold-detection applications (e.g., overvoltage alarms). |
| High input impedance (>1GΩ in hold mode) | Minimizes loading on high-impedance sensors (e.g., piezoelectric transducers, pH electrodes) without requiring external buffer amplifiers. |
Applications
| Transducer Interface | Battery-Powered Systems |
|---|---|
Use Scenario: Direct digitization of low-level outputs from strain gauges, thermocouples, or pressure sensors in handheld test equipment. IC Role / Device Role / Timing Role: ADC front-end with integrated S/H, providing 12-bit resolution and 200kHz throughput without external sample-hold circuitry. Use Value: Eliminates external op-amp buffers and reduces BOM count by 3–5 components while maintaining ±2 LSB linearity over –40°C to +85°C. |
Use Scenario: Continuous monitoring of battery voltage, temperature, and load current in wireless sensor nodes with 10-year target lifetime. IC Role / Device Role / Timing Role: Low-power ADC operating in burst mode, drawing ≤3µA between conversions and 2.3mW only during active sampling. Use Value: Extends battery life by enabling 1-second wake-up intervals with sub-µA average current, validated across 2000+ charge/discharge cycles. |
| Remote Data Acquisition | Isolated Data Acquisition |
Use Scenario: Distributed environmental monitoring using solar-charged nodes measuring humidity, CO₂, and ambient light over RS-485 links. IC Role / Device Role / Timing Role: Precision ADC interfacing to low-noise instrumentation amplifiers, feeding data to low-power MCU via SPI-compatible serial interface. Use Value: Delivers stable 12-bit accuracy despite supply ripple and temperature drift, with built-in common-mode rejection reducing need for additional filtering stages. |
Use Scenario: High-voltage motor phase current sensing where ADC must operate on floating side of isolation barrier (e.g., using ISO130 or Si89xx isolators). IC Role / Device Role / Timing Role: Isolated-side ADC converting shunt voltage with galvanic separation; differential input rejects ground bounce and EMI induced on long traces. Use Value: Maintains ±2 LSB INL under 1kV transient surges due to absence of internal reference - external reference can be locally filtered and stabilized. |
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 | 12-bit, 100kHz max sampling rate; identical MSOP-8 package and pinout; lower power (1.2mW at 100kHz) but half the throughput. | Suitable for slower-sampling applications like temperature logging where 200kHz is unnecessary. | Select ADS7817E/250 when real-time waveform capture or closed-loop control demands ≥150kHz effective sampling. |
| ADS8325IPW | 16-bit, 100kHz SAR ADC in TSSOP-16; higher resolution but larger footprint, higher power (12mW), and no power-down mode below 10µA. | Better for high-precision DC measurements (e.g., weigh scales), not optimized for battery life or space-constrained layouts. | Choose ADS7817E/250 for applications prioritizing micro-power operation, small size, and sufficient 12-bit resolution over ultimate DC accuracy. |
Compared with ADS7816E/250, the ADS7817E/250 delivers double the sampling rate in the same MSOP-8 footprint with only 1.1mW additional power; versus ADS8325IPW, it trades 4-bit resolution for 80% lower power, 44% smaller package, and true shutdown capability - making it optimal for portable, isolated, or multi-channel sensing where speed and efficiency outweigh raw precision.
Availability
ADS7817E/250 is available at Aetrix Electronics and suitable for transducer interface, battery-powered instrumentation, and remote data acquisition requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for ADS7817E/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 and embedded processing technologies, with decades of expertise in precision data converters and low-power design.
The ADS7817E/250 belongs to TI's precision SAR ADC product line, engineered specifically for high-fidelity signal acquisition in resource-constrained environments - emphasizing micro-power operation, differential input robustness, and seamless integration with transducers and isolation barriers.
FAQ
What is the maximum sampling rate supported by the ADS7817E/250?
The ADS7817E/250 supports a maximum sampling rate of 200kHz, achieved with a 3.2MHz DCLOCK signal (16× oversampling ratio). At this rate, conversion time is fixed at 12 clock cycles, and analog input sample time is 1.5–2.0 clock cycles. Lower rates down to 625Hz are supported by reducing DCLOCK frequency or extending CS inactive time.
Does the ADS7817E/250 require an external reference voltage?
Yes, the ADS7817E/250 requires an external reference voltage applied to the VREF pin. It operates with references from 100mV to 2.5V, and the selected value directly defines the full-scale input span (+In – –In = ±VREF) and LSB size (2 × VREF / 4096). No internal reference is provided.
What package type is used for the ADS7817E/250?
The ADS7817E/250 is supplied in an MSOP-8 package (drawing number 337), measuring 3.0mm × 4.9mm with 0.65mm lead pitch. This compact surface-mount package supports high-density PCB layouts and is RoHS-compliant per TI's standard specifications.
How does the power-down mode function on the ADS7817E/250?
Power-down on the ADS7817E/250 is activated by driving the CS/SHDN pin HIGH, reducing supply current to ≤3µA. In this state, both analog and digital sections are disabled. When CS is LOW, the device remains active only during conversion and serial output - automatically entering low-power analog hold mode between operations.
Can the ADS7817E/250 interface directly with a microcontroller's SPI port?
The ADS7817E/250 uses a 3-wire serial interface compatible with SPI hardware in master mode, but it is not a standard SPI peripheral: it lacks MOSI/MISO bidirectional lines and requires CS-driven timing control. DOUT is unidirectional, DCLOCK is input-only, and CS must be toggled per conversion - necessitating GPIO-controlled CS and custom firmware timing.
ADS7817E/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:
- -
ADS7817E/250 FAQ
1.How can I place an order for ADS7817E/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7817E/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 ADS7817E/250 reliable?
The price and inventory of ADS7817E/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7817E/250 is usually 5 days.
3.What payment methods are accepted for ADS7817E/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7817E/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7817E/250?
ADS7817E/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7817E/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 ADS7817E/250?
For technical support, including ADS7817E/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7817E/250 requirements.
6.How does Aetrix verify that ADS7817E/250 is sourced from the original manufacturer or authorized distributors?
All ADS7817E/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 ADS7817E/250 meets industry standards.
7.What is the process for return or replacement of ADS7817E/250?
All ADS7817E/250 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7817E/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 ADS7817E/250 part is unused and in its original packaging.
Return procedure for ADS7817E/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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