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Texas Instruments ADS7817EC/2K5
- Part No.:
- ADS7817EC/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7817EC/2K5.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,220
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Product details
Overview
ADS7817EC/2K5 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 precision transducer interfacing in battery-powered remote data acquisition systems.
For engineers reviewing the ADS7817EC/2K5 datasheet, ADS7817EC/2K5 pinout, ADS7817EC/2K5 application, or ADS7817EC/2K5 equivalent, key selection considerations include its micro-power serial interface, reference-voltage-scalable input range (100mV–2.5V), bipolar differential input architecture, and shutdown current of ≤3µA - all critical for low-noise, isolated, or multi-channel sensing designs.
Technical Context
The ADS7817EC/2K5 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 timing fully synchronized to DCLOCK falling edges.
Its digital interface uses a 3-wire synchronous serial protocol: CS/SHDN initiates conversion and controls shutdown mode, DOUT outputs 12-bit two's complement data MSB-first after one null bit, and DCLOCK clocks each bit on the falling edge - enabling LSB-first readout or short-cycling termination after any bit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes - guarantees monotonic transfer function across full operating range. |
| Sampling Rate | 200kHz maximum throughput - supports real-time monitoring of fast-changing sensor signals. |
| Power Consumption | 2.3mW at 200kHz (460µA quiescent current) - enables multi-hour operation on coin-cell batteries. |
| Shutdown Current | ≤3µA when CS = VCC - reduces system standby power by >99% versus active mode. |
| Differential Linearity | ±0.75 LSB (Grade C) - ensures <0.018% code-to-code nonlinearity for precision measurement. |
| Input Reference Range | 100mV to 2.5V - sets full-scale span from ±100mV to ±2.5V, enabling configurable sensitivity and noise floor. |
| Common-Mode Rejection | 80dB - suppresses interference common to +In and –In, critical for noisy industrial environments. |
Pinout & Package
ADS7817EC/2K5 is housed in an MSOP-8 package (3.0mm × 3.0mm, 0.65mm pitch), optimized for space-constrained PCB layouts in portable instrumentation and sensor nodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference voltage input | Sets full-scale analog input range; accepts 100mV–2.5V; draws up to 25µA at positive full scale. |
| +In (Pin 2) | Non-inverting analog input | Accepts bipolar differential signal; absolute voltage must stay within –0.3V to VCC+0.3V. |
| –In (Pin 3) | Inverting analog input | Completes differential pair; absolute voltage limited to –0.3V to 4V; matched impedance required with +In. |
| GND (Pin 4) | Analog ground reference | Must connect to clean analog ground plane - separate from digital ground to avoid noise coupling. |
| CS/SHDN (Pin 5) | Chip select / shutdown control | Active-low conversion trigger; HIGH forces full analog/digital power-down mode. |
| DOUT (Pin 6) | Serial data output | Outputs 12-bit two's complement MSB-first after one null bit; tri-states when CS goes HIGH. |
| DCLOCK (Pin 7) | Data clock input | Synchronizes serial output and conversion timing; falling edge clocks valid data onto DOUT. |
| +VCC (Pin 8) | Positive power supply | Operates from 4.75V to 5.25V; requires local 0.1µF ceramic bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| True differential input architecture | Enables rejection of common-mode noise and direct connection to bridge transducers without external instrumentation amplifiers. |
| Micro-power operation | 2.3mW at 200kHz sampling allows integration into energy-harvesting or battery-only systems with multi-year runtime. |
| Reference-voltage scalable resolution | LSB size adjusts from 49µV (100mV ref) to 1.22mV (2.5V ref), permitting trade-off between dynamic range and noise sensitivity. |
| Short-cycle conversion capability | CS can terminate conversion after any bit - reduces average power when only coarse threshold detection is needed. |
| High input impedance (>1GΩ in hold mode) | Minimizes loading on high-impedance sensors (e.g., piezoelectric, thermopile) without external buffers. |
Applications
| Transducer Interface | Battery Operated Systems |
|---|---|
Use Scenario: Direct digitization of millivolt-level outputs from load cells, strain gauges, or thermocouples in handheld test equipment. IC Role / Device Role / Timing Role: ADC front-end with integrated sample/hold, differential input, and serial output - eliminates need for external op-amps or level-shifting circuitry. Use Value: Achieves ±0.018% linearity error and 80dB CMRR while consuming only 2.3mW, extending battery life without sacrificing measurement fidelity. |
Use Scenario: Continuous voltage/current monitoring in portable medical devices or wireless sensor nodes powered by CR2032 cells. IC Role / Device Role / Timing Role: Low-power sampling ADC with programmable shutdown - synchronizes with MCU sleep/wake cycles to minimize system-level energy use. Use Value: 3µA shutdown current and short-cycle capability reduce average power to sub-µW levels during idle periods, enabling >5-year operation on a single cell. |
| Remote Data Acquisition | Isolated Data Acquisition |
Use Scenario: Distributed environmental sensing in industrial IoT gateways, collecting temperature, pressure, and humidity via long cable runs. IC Role / Device Role / Timing Role: High-impedance differential ADC placed at sensor node - rejects induced noise on twisted-pair wiring and minimizes signal degradation. Use Value: 15pF input capacitance and matched +In/–In impedance tolerance allow stable 200kHz sampling over 10m cables without external RC filtering. |
Use Scenario: Digitizing motor phase currents in AC inverter drives where ADC must be galvanically isolated from high-voltage power stages. IC Role / Device Role / Timing Role: Isolation-side ADC paired with digital isolators - receives isolated clock and CS signals, outputs serial data across barrier. Use Value: Serial interface and precise timing control (tdis = 25ns, tdDO = 85ns) ensure deterministic latency and synchronization with isolated gate drivers. |
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 | 12-bit, 100kHz max sampling rate; same MSOP-8 package and pinout; lower power (1.2mW @ 100kHz) but half the speed. | Best suited for slower-sampling applications like temperature logging where 200kHz is unnecessary. | Select ADS7817EC/2K5 when ≥200kHz sampling or superior CMRR (80dB vs 75dB) is required; choose ADS7816E/2K5 to reduce power in sub-100kHz systems. |
| ADS8325IBDBR | 16-bit, 100kSPS SAR ADC in MSOP-10; higher resolution and SNR (86dB), but larger package, higher power (12mW), and no shutdown mode. | Targets high-precision applications such as calibration equipment where resolution outweighs power or size constraints. | ADS7817EC/2K5 offers better power efficiency and smaller footprint for 12-bit needs; ADS8325IBDBR is appropriate only when true 16-bit ENOB is mandatory. |
Compared with ADS7817EC/2K5, ADS7816E/2K5 trades speed for lower power in identical packaging, while ADS8325IBDBR sacrifices power and size for 4-bit resolution gain - making ADS7817EC/2K5 the optimal balance of speed, precision, and micro-power operation in MSOP-8 form factor.
Availability
ADS7817EC/2K5 is available at Aetrix Electronics and suitable for transducer interface, battery-operated systems, and remote data acquisition requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for ADS7817EC/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
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 ADS7817EC/2K5 belongs to TI's precision SAR ADC product line, engineered specifically for high-fidelity, low-power signal acquisition in portable, isolated, and multi-channel sensing applications.
FAQ
What is the maximum sampling rate supported by the ADS7817EC/2K5?
The ADS7817EC/2K5 supports a maximum sampling rate of 200kHz, achieved with a 3.2MHz DCLOCK signal (16× oversampling). At this rate, it consumes 2.3mW and delivers 12-bit resolution with no missing codes. Lower rates reduce power linearly - e.g., 12.5kHz sampling draws only 40µA quiescent current.
Does the ADS7817EC/2K5 require an external reference voltage?
Yes, the ADS7817EC/2K5 requires an external reference voltage applied to the VREF pin. It operates with references from 100mV to 2.5V, directly setting the full-scale input range (±VREF). The reference must be stable and low-noise; typical current draw ranges from 1.3µA at low sample rates to 25µA at full scale and 200kHz.
How does the ADS7817EC/2K5 handle power management in battery-powered designs?
The ADS7817EC/2K5 provides two power-saving mechanisms: automatic power-down after conversion completion and full shutdown when CS/SHDN is driven HIGH, reducing current to ≤3µA. Combined with short-cycle conversion (terminating early via CS), it enables ultra-low average power in duty-cycled sensor systems.
What is the significance of the "EC" suffix in ADS7817EC/2K5?
The "EC" suffix denotes the MSOP-8 package with Grade C performance: ±1 LSB integral linearity error and ±0.75 LSB differential linearity error over –40°C to +85°C. The "/2K5" indicates tape-and-reel packaging with 2500 units per reel - standard for automated SMT assembly.
Can the ADS7817EC/2K5 interface directly with a microcontroller's SPI port?
Yes, the ADS7817EC/2K5 uses a 3-wire synchronous serial interface compatible with standard SPI modes. It outputs data MSB-first on DOUT synchronized to DCLOCK falling edges, with CS/SHDN acting as chip-select. No level-shifting is needed for 5V-tolerant MCUs; timing parameters (e.g., tdDO = 85ns) meet most SPI controller requirements.
ADS7817EC/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):
- 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/2K5 FAQ
1.How can I place an order for ADS7817EC/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7817EC/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 ADS7817EC/2K5 reliable?
The price and inventory of ADS7817EC/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7817EC/2K5 is usually 5 days.
3.What payment methods are accepted for ADS7817EC/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7817EC/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7817EC/2K5?
ADS7817EC/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7817EC/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 ADS7817EC/2K5?
For technical support, including ADS7817EC/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7817EC/2K5 requirements.
6.How does Aetrix verify that ADS7817EC/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS7817EC/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 ADS7817EC/2K5 meets industry standards.
7.What is the process for return or replacement of ADS7817EC/2K5?
All ADS7817EC/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7817EC/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 ADS7817EC/2K5 part is unused and in its original packaging.
Return procedure for ADS7817EC/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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