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Texas Instruments ADS7817EB/2K5G4
- Part No.:
- ADS7817EB/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7817EB/2K5G4.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,088
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Product details
Overview
ADS7817EB/2K5G4 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 package. It operates from a single +5V supply, accepts 100mV–2.5V external reference, and delivers binary two's complement serial output for transducer interface in battery-powered remote data acquisition systems.
For engineers reviewing the ADS7817EB/2K5G4 datasheet, ADS7817EB/2K5G4 pinout, ADS7817EB/2K5G4 application, or ADS7817EB/2K5G4 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply support for industrial embedded and low-power sensing designs.
Technical Context
The ADS7817EB/2K5G4 implements a capacitive redistribution successive approximation register (SAR) architecture on 0.6µm CMOS, integrating sample-and-hold functionality. Its differential input supports bipolar operation with common-mode rejection ≥80dB and AC common-mode rejection enabled by internal topology.
Conversion is initiated by falling edge of CS/SHDN; serial output begins after one null bit, with 12-bit MSB-first data valid on falling DCLOCK edges. Power-down mode (≤3µA) activates when CS/SHDN is HIGH, disabling both analog and digital sections-unlike post-conversion auto-power-down which retains digital bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes guaranteed - ensures monotonic transfer function for closed-loop control feedback. |
| Sampling Rate | 200kHz maximum throughput - supports anti-aliasing filter cutoff ≤100kHz in real-time sensor monitoring. |
| INL / DNL | ±1 LSB / ±0.7 LSB (B-grade) - enables <1 LSB error in 12-bit measurement without calibration in precision transducer interfaces. |
| Power Consumption | 2.3mW at 200kHz (5V supply) - allows continuous operation >100 hours on a single CR2032 coin cell in remote nodes. |
| Reference Range | 0.1V to 2.5V external VREF - sets full-scale span from ±100mV to ±2.5V; LSB size scales linearly (e.g., 1.22mV at 2.5V, 49µV at 0.1V). |
| Common-Mode Rejection | ≥80dB - suppresses noise coupled equally to +In and –In, critical for isolated bridge sensor front-ends. |
| Supply Voltage | +4.75V to +5.25V - compatible with standard 5V LDOs; rejects supply ripple ≥82dB up to 10kHz. |
Pinout & Package
ADS7817EB/2K5G4 is housed in an MSOP-8 package (3.0mm × 4.9mm, 0.65mm pitch), optimized for space-constrained PCB layouts in portable instrumentation and multi-channel DAQ modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VREF | External reference voltage input | Defines full-scale range; draws 1.3–25µA depending on code and sample rate - requires low-noise, low-Z source with 0.1µF local bypass. |
| 2 +In | Non-inverting analog input | Differential input node; absolute voltage must stay within –0.3V to +VCC+0.3V - matched impedance to –In essential for <0.5 LSB gain error drift. |
| 3 –In | Inverting analog input | Differential input node; absolute voltage limited to –0.3V to +4.0V - mismatched source impedances cause temperature-dependent linearity degradation. |
| 4 GND | Analog ground reference | Must connect to clean analog ground plane; separate from digital ground to prevent <0.25 LSB noise coupling into conversion result. |
| 5 CS/SHDN | Chip select / shutdown control | Active-low conversion trigger; HIGH forces full power-down (≤3µA) - enables ultra-low-power sleep between bursts in duty-cycled sensors. |
| 6 DOUT | Serial data output | MSB-first, two's complement format; data valid on falling DCLOCK edge - compatible with SPI Mode 0/3 microcontrollers without level translation. |
| 7 DCLOCK | Data clock input | Synchronizes serial output and controls conversion speed; min pulse width 150ns - supports variable clock rates (10kHz–3.2MHz) for adaptive power management. |
| 8 +VCC | Positive power supply | +5V nominal; requires 0.1µF ceramic capacitor placed <2mm from pin - insufficient bypassing causes >2 LSB noise at 200kHz sampling. |
Key Features
| Feature | Design Value |
|---|---|
| True differential input | Enables direct connection to Wheatstone bridges and isolated current-sense amplifiers without external instrumentation amps - reduces BOM count and layout area. |
| Micro power operation | 2.3mW at 200kHz and ≤3µA shutdown current - extends battery life in wireless sensor nodes where average current must stay below 10µA over 1-minute cycles. |
| Variable reference support | 100mV–2.5V VREF range allows optimization of dynamic range vs resolution - e.g., 100mV reference yields 49µV LSB for µV-level thermocouple signals. |
| Serial 3-wire interface | No parallel bus required; uses only CS/SHDN, DCLOCK, DOUT - simplifies routing in dense mixed-signal PCBs and eliminates address decoding logic. |
| AC common-mode rejection | ≥80dB rejection of 50/60Hz interference on differential inputs - eliminates need for external notch filters in industrial AC motor current sensing. |
Applications
| Transducer Interface | Battery Operated Systems |
|---|---|
Use Scenario: Direct digitization of strain gauge outputs in handheld torque meters with 200Hz update rate and 12-hour battery life. IC Role / Device Role / Timing Role: ADC front-end converting mV-level differential bridge signals to 12-bit digital values; synchronized to MCU wake-up timer. Use Value: Eliminates external op-amp gain stage and reference buffer - reduces system power by 1.8mW and board area by 22mm². |
Use Scenario: Continuous voltage monitoring of Li-ion cells in portable medical devices using intermittent 1-second sampling bursts. IC Role / Device Role / Timing Role: Low-quiescent ADC entering 3µA shutdown between samples; triggered by RTC alarm interrupt. Use Value: Achieves 1.2µA average current over 60-second cycle - extends 200mAh battery to 19 months runtime. |
| Remote Data Acquisition | Isolated Data Acquisition |
Use Scenario: Solar-powered environmental sensor node measuring temperature, humidity, and light intensity every 10 minutes via LoRaWAN. IC Role / Device Role / Timing Role: Primary ADC acquiring all analog channels sequentially; powered from supercapacitor charged by solar harvester. Use Value: 2.3mW active power enables full 12-bit conversion in <5ms - minimizes supercapacitor discharge per reading and extends operational uptime. |
Use Scenario: Isolated current sensing in 48V DC motor drives using optocoupler-isolated power and signal paths. IC Role / Device Role / Timing Role: ADC referenced to isolated 2.5V supply; differential inputs reject common-mode noise from PWM switching. Use Value: 80dB CMRR prevents 12-bit corruption from 20V/µs dv/dt transients - eliminates need for expensive isolated sigma-delta converters. |
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/250G4 | 10-bit resolution, same MSOP-8 package, identical pinout and serial interface - lower cost but sacrifices 4 LSBs of dynamic range. | Acceptable for 8-bit-equivalent control loops (e.g., fan speed regulation) but insufficient for precision thermistor or RTD measurements requiring <0.1°C accuracy. | Select when resolution demand is ≤10 bits and BOM cost reduction outweighs measurement fidelity loss. |
| ADS8325IPW | 16-bit SAR, 100kSPS, SPI-compatible, TSSOP-16 package - higher resolution and integrated reference, but larger footprint and 5× higher power (12mW). | Suitable for lab-grade data loggers needing ENOB >13.5, but overqualified for battery-powered field sensors where 12-bit linearity suffices. | Choose only when system requires >13-bit effective resolution and can accommodate larger PCB area and thermal budget. |
Compared with ADS7817EB/2K5G4, ADS7816EB/250G4 trades resolution for cost and power savings, while ADS8325IPW adds resolution and integration at the expense of size and quiescent current - making ADS7817EB/2K5G4 the optimal balance for space- and energy-constrained 12-bit sensing.
Availability
ADS7817EB/2K5G4 is available at Aetrix Electronics and suitable for transducer interface, battery operated systems, remote data acquisition, isolated data acquisition, and AC motor control requiring stable component supply across automotive, industrial, and medical OEM programs.
Supply support for ADS7817EB/2K5G4 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 signal chain solutions.
The ADS7817EB/2K5G4 belongs to TI's precision SAR ADC product line, engineered specifically for ultra-low-power, high-accuracy digitization in portable and remote sensing applications where size, energy efficiency, and differential noise immunity are critical.
FAQ
What is the guaranteed integral linearity error for ADS7817EB/2K5G4?
The ADS7817EB/2K5G4 is specified as a B-grade device with ±1 LSB integral linearity error over –40°C to +85°C. This is confirmed in the Electrical Characteristics table of the SBAS066A datasheet under "Integral Linearity Error" for ADS7817B. The value holds across the full 200kHz sampling range and 0.1V–2.5V reference voltage span, enabling uncalibrated 12-bit accuracy in transducer interfaces.
Does ADS7817EB/2K5G4 support true bipolar input operation?
Yes, ADS7817EB/2K5G4 supports true bipolar differential input: the full-scale span is +In – (–In), ranging from –VREF to +VREF. With VREF = 2.5V, it accepts ±2.5V differential input; with VREF = 100mV, it accepts ±100mV. The input common-mode voltage range depends on VREF and is explicitly defined in Figures 2 and 3 of the datasheet - confirming genuine bipolar capability without external level-shifting circuitry.
What is the minimum clock frequency supported by ADS7817EB/2K5G4?
The ADS7817EB/2K5G4 supports DCLOCK frequencies as low as 10kHz (corresponding to 625Hz throughput), per the Electrical Characteristics table. At this rate, the device draws only 40µA quiescent current (fSAMPLE = 12.5kHz condition). The minimum high/low time is 150ns, making it compatible with low-frequency microcontroller GPIO clocks - ideal for ultra-low-power wake-on-event sensor nodes.
Can ADS7817EB/2K5G4 be used with a 3.3V supply?
No - ADS7817EB/2K5G4 requires +4.75V to +5.25V supply voltage, as specified in Absolute Maximum Ratings and Electrical Characteristics. Operation below 4.75V violates the guaranteed performance envelope and may cause missing codes or increased INL/DNL. For 3.3V systems, TI recommends the pin-compatible ADS7817U (SO-8) with same core specs but rated for 3V–5.5V operation - not the ADS7817EB/2K5G4 variant.
How does the reference current vary with sample rate in ADS7817EB/2K5G4?
In ADS7817EB/2K5G4, reference current scales with sample rate: at 200kHz it ranges from 1.3µA (code FF8h) to 25µA (code 7FFh); at 12.5kHz it drops to 1.3µA (typical). This behavior is documented in the "Reference Current vs Sample Rate" curve (page 7, SBAS066A) and reflects charge demand on the internal capacitor array per conversion - critical for sizing external reference buffers in low-drift designs.
ADS7817EB/2K5G4 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:
- -
ADS7817EB/2K5G4 FAQ
1.How can I place an order for ADS7817EB/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7817EB/2K5G4 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/2K5G4 reliable?
The price and inventory of ADS7817EB/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7817EB/2K5G4 is usually 5 days.
3.What payment methods are accepted for ADS7817EB/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7817EB/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7817EB/2K5G4?
ADS7817EB/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7817EB/2K5G4 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/2K5G4?
For technical support, including ADS7817EB/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7817EB/2K5G4 requirements.
6.How does Aetrix verify that ADS7817EB/2K5G4 is sourced from the original manufacturer or authorized distributors?
All ADS7817EB/2K5G4 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/2K5G4 meets industry standards.
7.What is the process for return or replacement of ADS7817EB/2K5G4?
All ADS7817EB/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7817EB/2K5G4, 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/2K5G4 part is unused and in its original packaging.
Return procedure for ADS7817EB/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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