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Texas Instruments ADS7817EB
- Part No.:
- ADS7817EB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7817EB.pdf
- Description:
- SAR ADC, 12-BIT, SERIAL ACCESS
- Quantity:
- Payment:
- Shipping:
Inventory:174
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Product details
Overview
ADS7817EB 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 ADS7817EB datasheet, ADS7817EB pinout, ADS7817EB application, or ADS7817EB equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply support for industrial embedded and isolated sensing designs.
Technical Context
The ADS7817EB implements a capacitive redistribution successive approximation register (SAR) architecture on 0.6µm CMOS, enabling single-cycle 12-bit conversion with no pipeline delay. It requires an external reference (100mV–2.5V), external clock (10kHz–3.2MHz), and +5V supply-supporting bipolar differential input with AC common-mode rejection.
Its serial 3-wire interface uses CS/SHDN for conversion initiation and shutdown control, DCLOCK for synchronous bit transfer, and DOUT for MSB-first two's complement output. Power-down current is 3µA max when CS = VCC, and analog input impedance exceeds 1GΩ in hold or shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output codes with no missing codes guaranteed. |
| Sampling Rate | 200kHz maximum - supports real-time monitoring of fast-changing sensor signals like motor current feedback. |
| Input Type | Fully differential, high-impedance - accepts ±VREF span with common-mode voltage up to VREF, enabling direct transducer connection without signal conditioning. |
| Power Consumption | 2.3mW at 200kHz - enables multi-channel battery-operated DAQ with >10-year coin-cell life at reduced sample rates. |
| Reference Range | 100mV to 2.5V - sets LSB size from 49µV to 1.22mV, allowing trade-off between resolution and noise sensitivity. |
| Integral Linearity | ±2 LSB - ensures <0.05% full-scale error across temperature, critical for precision bridge sensor measurements. |
| Shutdown Current | 3µA max - reduces system standby power by >99% versus active mode, essential for wake-on-event architectures. |
Pinout & Package
ADS7817EB is housed in an MSOP-8 package (3.0mm × 3.0mm, 0.65mm pitch), optimized for space-constrained PCB layouts in portable instrumentation and motor control modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Sets full-scale analog range; accepts 100mV–2.5V; draws 1.3–20µA depending on sample rate and code. |
| +In (Pin 2) | Non-Inverting Analog Input | Accepts voltage up to VCC+0.3V; forms differential pair with –In; input capacitance is 15pF. |
| –In (Pin 3) | Inverting Analog Input | Accepts voltage up to 4V; matched impedance with +In required to avoid gain/linearity drift vs temperature. |
| GND (Pin 4) | Analog Ground | Must connect to clean analog ground plane; isolation from digital ground prevents noise coupling into conversion. |
| CS/SHDN (Pin 5) | Chip Select / Shutdown Control | Active-low conversion trigger; HIGH forces full shutdown (3µA), LOW enables conversion and serial output. |
| DOUT (Pin 6) | Serial Data Output | MSB-first two's complement; data valid on falling DCLOCK edge; tri-states after transmission completes. |
| DCLOCK (Pin 7) | Data Clock Input | Synchronizes serial output and controls conversion speed; min pulse width 150ns; duty cycle flexible. |
| +VCC (Pin 8) | Power Supply | +4.75V to +5.25V; supplies analog and digital sections; requires local 0.1µF ceramic bypass. |
Key Features
| Feature | Design Value |
|---|---|
| True Differential Input | Rejects common-mode noise up to 80dB, enabling reliable operation in noisy motor drive environments. |
| Micro Power Operation | 2.3mW at 200kHz and 3µA shutdown current allow integration into energy-harvesting sensor nodes. |
| Flexible Reference Interface | 100mV–2.5V range permits use of low-noise bandgap references or scaled-down supply rails for cost-sensitive designs. |
| Short-Cycling Capability | CS can terminate conversion mid-sequence (e.g., after 8 bits), reducing average power in threshold-detection applications. |
| AC Common-Mode Rejection | Maintains accuracy against high-frequency interference on sensor cables, critical for long-line industrial transducers. |
Applications
| Transducer Interface | Battery-Operated Systems |
|---|---|
Use Scenario: Direct digitization of strain gauge, RTD, or piezoelectric sensor outputs in handheld test equipment. IC Role / Device Role / Timing Role: ADC front-end with differential input and internal sample/hold eliminates need for external op-amps or multiplexers. Use Value: Enables 12-bit resolution at 200kHz while consuming only 2.3mW, extending AA-battery life to >2 years in portable DAQ. |
Use Scenario: Low-power environmental monitoring node powered by CR2032 coin cell, sampling temperature/humidity every 10 seconds. IC Role / Device Role / Timing Role: Precision ADC with 3µA shutdown current and fast wake-up (<1µs) for event-triggered measurement bursts. Use Value: Reduces average current to <1µA during sleep, achieving >10-year operational lifetime without battery replacement. |
| Remote Data Acquisition | Isolated Data Acquisition |
Use Scenario: Distributed sensor network in oil & gas field, acquiring pressure and flow data over 100m twisted-pair lines. IC Role / Device Role / Timing Role: High-impedance differential input rejects induced EMI; serial interface minimizes isolation channel count. Use Value: Delivers ±2 LSB linearity despite 50/60Hz pickup and RF noise, eliminating post-processing calibration in firmware. |
Use Scenario: Motor phase current sensing in variable-frequency drives using optocoupler-isolated ADC interface. IC Role / Device Role / Timing Role: ADC placed on high-side floating domain; serial output referenced to isolated ground, synchronized via isolated DCLOCK. Use Value: Supports 200kHz sampling across isolation barrier with <10ns timing skew, enabling precise FOC (Field-Oriented Control). |
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 | 12-bit, 100kHz max sampling rate; same MSOP-8 package and pinout; lower power (1.2mW @ 100kHz). | Not suitable for 200kHz motor control loops; adequate for slower sensor monitoring (e.g., HVAC thermistors). | Select ADS7817EB when 200kHz throughput or better AC common-mode rejection (80dB vs 75dB) is required. |
| ADS8325IDRCT | 16-bit, 100kSPS SAR ADC in VSSOP-10; integrated reference; SPI-compatible interface; higher SNR (86dB). | Higher resolution but larger footprint and 2× cost; requires additional decoupling due to integrated ref. | Choose ADS7817EB for cost-sensitive, space-constrained 12-bit systems where micro-power and differential input are prioritized over resolution. |
Compared with ADS7816EB and ADS8325IDRCT, the ADS7817EB uniquely balances 200kHz sampling, true differential input, sub-3µA shutdown, and MSOP-8 compactness-making it optimal for battery-powered transducer interfaces demanding both speed and ultra-low quiescent power.
Availability
ADS7817EB is available at Aetrix Electronics and suitable for remote data acquisition, isolated motor control, and battery-operated sensor nodes requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for ADS7817EB 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 belongs to TI's precision SAR ADC product line, engineered specifically for high-fidelity, low-power digitization of differential sensor signals in harsh, space- and energy-constrained environments.
FAQ
What is the absolute maximum input voltage range for ADS7817EB?
The ADS7817EB specifies +In input voltage range as –0.3V to (+VCC + 0.3V), and –In as –0.3V to +4V. With +VCC = +5V, this means +In may swing from –0.3V to +5.3V, while –In must stay ≤ +4V. Exceeding these limits risks permanent damage or degraded linearity. These ratings are defined in the Absolute Maximum Ratings table of the SBAS066A datasheet.
Does ADS7817EB support unipolar input configurations?
Yes, ADS7817EB supports unipolar operation via single-ended input mode: tie –In to a fixed reference voltage (e.g., VREF/2), and drive +In with a signal swinging ±VREF around that common point. The full-scale input span becomes 2 × VREF, and the output remains two's complement. This configuration is explicitly described in the "Analog Input" section of the SBAS066A datasheet.
What is the minimum clock frequency required for ADS7817EB to maintain specified performance?
The ADS7817EB requires a minimum DCLOCK frequency of 10kHz to sustain full 12-bit accuracy, corresponding to a 625Hz throughput rate. At lower frequencies, capacitor leakage degrades acquisition time and increases offset/gain errors. This limit is derived from the internal capacitor array's leakage characteristics and is documented in the "Theory of Operation" section of SBAS066A.
Can ADS7817EB be used with a 3.3V supply instead of 5V?
No-ADS7817EB is specified only for +VCC = +4.75V to +5.25V. Its digital logic levels (VIH = 3.0V min, VOH = 3.5V min) and internal analog circuitry require 5V operation. Using 3.3V violates the Absolute Maximum Ratings and will result in non-functional serial interface and incomplete conversions. TI does not characterize or guarantee operation outside this range.
How does reference voltage selection affect effective number of bits (ENOB) in ADS7817EB?
Lowering the ADS7817EB reference voltage reduces LSB size but increases relative noise impact: at 2.5V, ENOB ≈ 11.5 bits; at 100mV, ENOB drops to ~8.5 bits due to 25× larger peak-to-peak noise contribution (13 LSB vs 0.52 LSB). This relationship is quantified in the "Effective Number of Bits vs Reference Voltage" plot (Figure 4) of SBAS066A.
ADS7817EB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- -
- 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 FAQ
1.How can I place an order for ADS7817EB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7817EB 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 reliable?
The price and inventory of ADS7817EB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7817EB is usually 5 days.
3.What payment methods are accepted for ADS7817EB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7817EB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7817EB?
ADS7817EB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7817EB 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?
For technical support, including ADS7817EB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7817EB requirements.
6.How does Aetrix verify that ADS7817EB is sourced from the original manufacturer or authorized distributors?
All ADS7817EB 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 meets industry standards.
7.What is the process for return or replacement of ADS7817EB?
All ADS7817EB units undergo pre-shipment inspection (PSI). If there is an issue with ADS7817EB, 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 part is unused and in its original packaging.
Return procedure for ADS7817EB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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