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ADS7861E
Texas Instruments
IC ADC 12BIT SAR 24SSOP
2817 Pcs New Original In Stock
12 Bit Analog to Digital Converter 4 Input 2 SAR 24-SSOP
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ADS7861E
Product Overview
1240036
DiGi Electronics Part Number
ADS7861E-DGManufacturer
Texas Instruments
ADS7861E
Description
IC ADC 12BIT SAR 24SSOPInventory
2817 Pcs New Original In Stock
12 Bit Analog to Digital Converter 4 Input 2 SAR 24-SSOP
CAD Models - PCB Symbols & Footprints
Quantity
Minimum 1
Minimum 1
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ADS7861E Technical Specifications
Category
Data Acquisition, Analog to Digital Converters (ADC)
Packaging
Tube
Series
-
Product Status
Active
Number of Bits
12
Sampling Rate (Per Second)
500k
Number of Inputs
4
Input Type
Differential
Data Interface
SPI
Configuration
MUX-S/H-ADC
Ratio - S/H:ADC
1:1
Number of A/D Converters
2
Architecture
SAR
Reference Type
External, Internal
Voltage - Supply, Analog
5V
Voltage - Supply, Digital
5V
Features
Selectable Address, Simultaneous Sampling
Operating Temperature
-40°C ~ 125°C
Package / Case
24-SSOP (0.154", 3.90mm Width)
Supplier Device Package
24-SSOP
Mounting Type
Surface Mount
Base Product Number
ADS7861
Datasheet & Documents
Manufacturer Product Page
ADS7861E Specifications
HTML Datasheet
ADS7861E-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
-ADS7861E-NDR
ADS7861E-DG
ADS7861E-NDR
ADS7861EG4-DG
-296-44404-5-DG
2156-ADS7861E
TEXTISADS7861E
ADS7861EG4
-ADS7861EG4
296-44404-5
-ADS7861E-DG
-ADS7861EG4-NDR
Standard Package
50
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
DiGi Electronics는 신뢰할 수 있는 브랜드인 것 같아요. 배송도 빠르고 제품도 최고입니다.
Dec 02, 2025
DiGi Electronics bietet eine äußerst kosteneffektive Lösung, verbunden mit einer intuitiven Webseite.
Dec 02, 2025
DiGi Electronicsのスタッフはとても親切で、初めての購入でも安心して任せられました。
Dec 02, 2025
I appreciate their proactive approach in providing support after purchase.
Dec 02, 2025
Shipping was incredibly swift, and I received my order way sooner than anticipated.
Dec 02, 2025
I was amazed by how quickly my order was shipped and delivered.
Dec 02, 2025
The consistency in product quality and after-sales service is truly impressive.
Dec 02, 2025
Tracking my package was seamless; I received timely alerts about transit status and expected delivery.
Dec 02, 2025
Their packaging quality demonstrates attention to detail and professionalism.
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Frequently Asked Questions (FAQ)
What are the key design risks when replacing the ADS7861E with a lower-cost 12-bit SAR ADC like the AD7476A in a high-noise industrial control system?
Replacing the ADS7861E with the AD7476A introduces several critical risks: the AD7476A lacks simultaneous sampling, which can cause phase errors in multi-channel measurements common in motor control or power monitoring applications. Additionally, the ADS7861E supports differential inputs and an internal reference option, while the AD7476A is single-ended and requires an external reference, increasing noise susceptibility and BOM complexity. The ADS7861E’s wider operating temperature range (-40°C to 125°C) also makes it more suitable for harsh environments. If cost is a driver, consider the ADS7866 instead—it retains differential inputs and simultaneous sampling at a lower price point than the ADS7861E.
How does the ADS7861E’s simultaneous sampling capability impact system accuracy in a 4-channel data acquisition design for motor current sensing?
The ADS7861E’s dual SAR architecture enables true simultaneous sampling across its four inputs, eliminating time skew between channels—a critical factor in motor current sensing where phase relationships affect torque estimation and fault detection. Without this feature (e.g., using a multiplexed ADC like the MCP3204), sampled currents may be misaligned by microseconds, leading to erroneous RMS or power calculations. When designing with the ADS7861E, ensure the analog front-end anti-aliasing filters are matched across channels to preserve phase coherence, and use the internal sample-and-hold to freeze all inputs at the same instant, maximizing measurement fidelity in dynamic load conditions.
Can the ADS7861E safely operate with a 3.3V digital interface if the microcontroller only supports 3.3V logic levels?
The ADS7861E requires a 5V digital supply (VDD), but its SPI interface is not 5V-tolerant on input pins when powered at 3.3V. However, if the ADS7861E is powered at 5V, its digital outputs may exceed the absolute maximum ratings of a 3.3V MCU. To safely interface, use a level shifter (e.g., TXB0104) on the SCLK, MOSI, and CS lines, or configure the MCU to accept 5V-tolerant inputs (if supported). Alternatively, power the ADS7861E’s digital section from 3.3V—but verify timing margins, as the SPI clock frequency may need reduction below 10 MHz due to slower rise times. Always validate signal integrity with an oscilloscope to avoid intermittent communication failures.
What layout and grounding practices are essential to maintain 12-bit accuracy when using the ADS7861E in a mixed-signal PCB with switching regulators nearby?
To preserve the ADS7861E’s 12-bit performance in noisy environments, isolate analog and digital grounds at a single point near the ADC, and route all analog input traces away from digital signals and switching regulator loops. Use a solid ground plane beneath the ADS7861E and place decoupling capacitors (100 nF ceramic + 10 µF tantalum) as close as possible to the AVDD and DVDD pins. The reference voltage pin (REFIN) must have its own local bypassing and guard ring to prevent coupling from adjacent digital traces. Avoid routing high-speed SPI lines over split planes. These practices minimize ground bounce and reference noise, which are dominant error sources in SAR ADCs like the ADS7861E operating near 500 kSPS.
Is the ADS7861E a suitable drop-in replacement for the older ADS7860 in a legacy 5V industrial DAQ system, and what firmware changes might be needed?
The ADS7861E is functionally compatible with the ADS7860 and can serve as a drop-in replacement in most 5V systems due to identical pinout, package (24-SSOP), and SPI interface. However, the ADS7861E offers improved linearity and a selectable device address feature not present in the ADS7860, which may require minor firmware updates if multiple ADCs share the same SPI bus. Ensure the microcontroller’s SPI clock polarity and phase match the ADS7861E’s timing requirements (typically CPOL=0, CPHA=0). Also verify that the internal reference startup time (if used) is accounted for in the acquisition sequence. No hardware changes are needed, but validate performance under full load to confirm noise and settling behavior meet system requirements.
Quality Assurance (QC)
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ADS7861E CAD Models
Texas Instruments ADS7861E PCB symbols & footprints
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