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Texas Instruments ADS7817UC/2K5
- Part No.:
- ADS7817UC/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADS7817UC/2K5.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,224
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Product details
Overview
ADS7817UC/2K5 from Texas Instruments is a 12-bit, 200kHz SAR analog-to-digital converter with fully differential high-impedance inputs, 2.5V reference support, ±1 LSB integral linearity, and micro-power operation (2.3mW at full rate). It interfaces directly to transducers in battery-powered remote data acquisition systems using a 3-wire serial interface.
For engineers reviewing the ADS7817UC/2K5 datasheet, ADS7817UC/2K5 pinout, ADS7817UC/2K5 application, or ADS7817UC/2K5 equivalent, key selection criteria include its differential input architecture, reference voltage scalability (100mV–2.5V), low 3µA shutdown current, SO-8 package compatibility, and Binary Two's Complement output format.
Technical Context
The ADS7817UC/2K5 implements a capacitive redistribution successive approximation register (SAR) architecture fabricated in 0.6µm CMOS, integrating sample-and-hold functionality. It requires an external clock (10kHz–3.2MHz), single +5V supply, and external reference-no internal reference or driver circuitry is included.
Its analog input accepts true bipolar differential signals up to ±VREF, with common-mode rejection of 80dB and power supply rejection of 82dB. Conversion timing is deterministic: 12 clock cycles for conversion plus 1.5 cycles for acquisition, with serial output (MSB-first) synchronized to DCLOCK falling edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with no missing codes guaranteed |
| Sampling Rate | 200kHz - supports real-time monitoring of fast-changing sensor signals |
| Integral Linearity Error | ±1 LSB - ensures monotonicity and ≤0.024% full-scale error at VREF = 2.5V |
| Power Consumption | 2.3mW at 200kHz - enables multi-hour operation on coin-cell batteries |
| Shutdown Current | 3µA max - reduces system standby power in sleep-mode data loggers |
| Reference Range | 0.1V to 2.5V - allows flexible input span scaling from ±49µV to ±1.22mV LSB resolution |
| Input Capacitance | 15pF - defines required source impedance matching to avoid settling-induced gain/offset drift |
Pinout & Package
ADS7817UC/2K5 is housed in an SO-8 (SOIC-8) surface-mount package with standard 1.27mm pitch, compatible with automated assembly and IPC-7351B footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VREF | Reference Input | External voltage sets full-scale analog input range; draws up to 25µA at 200kHz and code 7FFh |
| 2 +In | Non-Inverting Analog Input | Differential input terminal; must be driven with matched impedance to –In to maintain linearity |
| 3 –In | Inverting Analog Input | Differential input terminal; common-mode voltage range depends on VREF per Figure 3 |
| 4 GND | Analog Ground | Primary return path for analog circuitry; requires dedicated low-noise ground connection |
| 5 CS/SHDN | Chip Select / Shutdown Control | Active-low conversion trigger; HIGH forces full analog+digital power-down mode |
| 6 DOUT | Serial Data Output | 3-wire MSB-first output; data valid on falling edge of DCLOCK; tri-states after transfer |
| 7 DCLOCK | Data Clock Input | Synchronizes serial output and controls conversion speed; min. 150ns high/low time |
| 8 +VCC | Power Supply | +4.75V to +5.25V operation; supplies both analog and digital sections |
Key Features
| Feature | Design Value |
|---|---|
| True Differential Input | Rejects common-mode noise up to 80dB while enabling direct connection to bridge sensors without instrumentation amps |
| Micro-Power Operation | 2.3mW at 200kHz sampling enables >100-hour runtime on CR2032 in portable data loggers |
| Scalable Reference Interface | VREF range (100mV–2.5V) permits optimization of dynamic range vs. noise floor for specific transducer outputs |
| Short-Cycling Capability | CS HIGH during conversion terminates output early-enables adaptive bit-depth reduction to save power in threshold-detection apps |
| Binary Two's Complement Output | Direct signed integer representation simplifies firmware math for bipolar sensor signals (e.g., strain gauges, accelerometers) |
Applications
| Transducer Interface | Battery-Operated Systems |
|---|---|
Use Scenario: Direct digitization of millivolt-level outputs from load cells, thermocouples, or pressure bridges in handheld test equipment. IC Role / Device Role / Timing Role: ADC front-end with integrated sample/hold; acquires differential signal at 200kHz with 12-bit precision and zero pipeline delay. Use Value: Eliminates need for external op-amp signal conditioning, reducing BOM count and PCB area by ≥3 components per channel. |
Use Scenario: Continuous voltage/current monitoring in wireless sensor nodes powered by Li-SOCl₂ batteries with 10-year shelf life. IC Role / Device Role / Timing Role: Low-quiescent ADC core operating in burst mode-active only during scheduled 200kHz sampling windows, then entering 3µA shutdown. Use Value: Achieves average system current <10µA over 1-minute measurement intervals, extending battery life beyond 5 years. |
| Remote Data Acquisition | Isolated Data Acquisition |
Use Scenario: Distributed environmental sensing across RS-485 networks in industrial plants, where analog signals travel 100+ meters over twisted pair. IC Role / Device Role / Timing Role: Local SAR ADC converting sensor outputs near point-of-measurement to reduce noise pickup on long analog runs. Use Value: Differential input rejects induced 50/60Hz interference; 15pF input capacitance minimizes filter complexity before isolation barriers. |
Use Scenario: Digitizing motor phase currents in variable-frequency drives with galvanic isolation between power stage and control MCU. IC Role / Device Role / Timing Role: Isolated-side ADC feeding isolated SPI or opto-coupled serial interface; operates from isolated 5V rail. Use Value: Bipolar input range accommodates ±2.5V current-sense amplifier outputs without level-shifting; SO-8 footprint fits tight isolation creepage/clearance constraints. |
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 |
|---|---|---|---|
| ADS7816U/2K5 | 12-bit, 100kHz max sampling rate; identical SO-8 package and pinout; ±1 LSB INL at same grade | Lower throughput suits slower sensors (e.g., temperature, humidity); 1.15mW power at 100kHz | Select when 200kHz is unnecessary-reduces clocking EMI and reference current demand by 2× |
| ADS8320EB/250 | 16-bit, 100kHz SAR ADC in MSOP-8; 2.5V reference fixed; ±1 LSB INL; SPI-compatible interface | Higher resolution for precision metrology; larger die size increases cost and thermal drift sensitivity | Choose when ENOB >11.5 bits required; verify layout supports tighter MSOP-8 thermal management |
Compared with ADS7817UC/2K5, ADS7816U/2K5 trades half the sampling bandwidth for lower power and cost in static-signal applications, while ADS8320EB/250 provides 4 extra bits at the expense of higher price, larger reference stability demands, and reduced temperature robustness.
Availability
ADS7817UC/2K5 is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition nodes, and transducer interface modules requiring stable component supply across extended production lifecycles.
Supply support for ADS7817UC/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 ADS7817UC/2K5 belongs to TI's legacy precision SAR ADC product line, engineered specifically for ultra-low-power, high-fidelity digitization in space- and energy-constrained embedded systems.
FAQ
What is the maximum sampling rate supported by the ADS7817UC/2K5?
The ADS7817UC/2K5 supports a maximum sampling rate of 200kHz, achieved with a 3.2MHz DCLOCK input (16× oversampling ratio). At this rate, conversion time is fixed at 12 clock cycles plus 1.5 cycles acquisition, delivering deterministic latency critical for closed-loop control applications. Lower rates down to 12.5kHz are supported with proportional reduction in power consumption.
Does the ADS7817UC/2K5 include an internal voltage reference?
No, the ADS7817UC/2K5 requires an external reference voltage applied to the VREF pin. It accepts any stable voltage from 100mV to 2.5V, which directly defines the full-scale input range (±VREF for differential mode). The device draws reference current that varies with conversion result and sample rate-up to 25µA at 200kHz and code 7FFh.
What package type is used for the ADS7817UC/2K5?
The ADS7817UC/2K5 is supplied in an SO-8 (SOIC-8) surface-mount package with standard 1.27mm lead pitch and JEDEC MO-153 compliance. This package matches the pinout and footprint of the ADS7817U series and supports reflow soldering per IPC-J-STD-020.
How does the ADS7817UC/2K5 handle power-down mode?
The ADS7817UC/2K5 enters full power-down mode when the CS/SHDN pin is driven HIGH, reducing supply current to ≤3µA. In this state, both analog and digital sections are disabled. After conversion completion with CS LOW, only the analog section powers down-digital logic remains active, so true minimum current requires explicit CS HIGH assertion.
What is the output data format of the ADS7817UC/2K5?
The ADS7817UC/2K5 outputs data in Binary Two's Complement format, providing signed 12-bit results directly usable for bipolar signals. For example, input = +VREF yields 0111 1111 1111 (7FFh), midscale = 0000 0000 0000 (000h), and –VREF = 1000 0000 0000 (800h). No post-processing is needed for signed arithmetic in firmware.
ADS7817UC/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7817UC/2K5 FAQ
1.How can I place an order for ADS7817UC/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7817UC/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 ADS7817UC/2K5 reliable?
The price and inventory of ADS7817UC/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7817UC/2K5 is usually 5 days.
3.What payment methods are accepted for ADS7817UC/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7817UC/2K5 transactions.
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4.How is shipping managed for ADS7817UC/2K5?
ADS7817UC/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7817UC/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 ADS7817UC/2K5?
For technical support, including ADS7817UC/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7817UC/2K5 requirements.
6.How does Aetrix verify that ADS7817UC/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS7817UC/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 ADS7817UC/2K5 meets industry standards.
7.What is the process for return or replacement of ADS7817UC/2K5?
All ADS7817UC/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7817UC/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 ADS7817UC/2K5 part is unused and in its original packaging.
Return procedure for ADS7817UC/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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