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ADS7844EB
Texas Instruments
IC ADC 12BIT SAR 20SSOP
1740 Pcs New Original In Stock
12 Bit Analog to Digital Converter 4, 8 Input 1 SAR 20-SSOP
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5.0 / 5.0
- (244 Ratings)
ADS7844EB
Product Overview
1415532
DiGi Electronics Part Number
ADS7844EB-DGManufacturer
Texas Instruments
ADS7844EB
Description
IC ADC 12BIT SAR 20SSOPInventory
1740 Pcs New Original In Stock
12 Bit Analog to Digital Converter 4, 8 Input 1 SAR 20-SSOP
Quantity
Minimum 1
Minimum 1
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ADS7844EB Technical Specifications
Category
Data Acquisition, Analog to Digital Converters (ADC)
Packaging
Tube
Series
-
Product Status
Active
Number of Bits
12
Sampling Rate (Per Second)
200k
Number of Inputs
4, 8
Input Type
Differential, Single Ended
Data Interface
SPI
Configuration
MUX-S/H-ADC
Ratio - S/H:ADC
1:1
Number of A/D Converters
1
Architecture
SAR
Reference Type
External
Voltage - Supply, Analog
2.7V ~ 3.6V, 5V
Voltage - Supply, Digital
2.7V ~ 3.6V, 5V
Features
-
Operating Temperature
-40°C ~ 85°C
Package / Case
20-SSOP (0.154", 3.90mm Width)
Supplier Device Package
20-SSOP
Mounting Type
Surface Mount
Base Product Number
ADS7844
Datasheet & Documents
Manufacturer Product Page
ADS7844EB Specifications
HTML Datasheet
ADS7844EB-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
-ADS7844EB-DG
2156-ADS7844EB
-ADS7844EBG4-NDR
TEXTISADS7844EB
-ADS7844EBG4
ADS7844EB-NDR
-ADS7844EB-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)
de desembre 02, 2025
他們經常提供專業的建議和技術支援，非常有幫助。
de desembre 02, 2025
Leur organisation logistique est une garantie de fiabilité et de rapidité dans la livraison.
de desembre 02, 2025
Ils ont su optimiser leur chaîne logistique pour garantir ma satisfaction, bravo !
de desembre 02, 2025
The packaging is secure and professional, giving peace of mind during delivery.
de desembre 02, 2025
DiGi Electronics' transparent pricing model is truly refreshing and appreciated.
de desembre 02, 2025
Their post-sales team offers comprehensive support, making problem resolution straightforward.
de desembre 02, 2025
Using DiGi Electronics’ products has significantly reduced my maintenance needs due to their durability.
de desembre 02, 2025
The packaging from DiGi Electronics is sturdy and professional, reflecting their commitment to quality and customer satisfaction.
de desembre 02, 2025
Their reliable inventory and supportive after-sales team have become crucial to our success.
de desembre 02, 2025
The transparent prices help me compare options confidently.
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Frequently Asked Questions (FAQ)
Can the ADS7844EB be safely used as a drop-in replacement for the ADS7843 in a 5V single-supply industrial control system, and what design changes are needed to avoid signal integrity issues?
The ADS7844EB can replace the ADS7843 in many 5V applications due to its compatible pinout and SPI interface, but critical differences exist: the ADS7844EB supports both differential and single-ended inputs while the ADS7843 is touch-screen specific with built-in drivers. When replacing, ensure your analog front-end matches the ADS7844EB’s input structure—avoid driving inputs beyond VREF if using external reference, and verify that sampling timing meets the 200kSPS requirement under load. Also, confirm that your microcontroller’s SPI mode (CPOL/CPHA) matches the ADS7844EB’s timing; incorrect settings cause silent data corruption. Always validate with an oscilloscope on DOUT during initial bring-up.
What are the risks of operating the ADS7844EB near its -40°C lower temperature limit in a battery-powered outdoor sensor node, and how does MSL 2 affect board assembly reliability?
Operating the ADS7844EB at -40°C is within spec, but performance may degrade slightly due to increased comparator delay in the SAR core, potentially reducing effective resolution at high sample rates. In battery-powered nodes, ensure the analog supply remains above 2.7V under cold conditions—lithium batteries sag significantly in the cold. Additionally, MSL 2 (1-year floor life) means the 20-SSOP package is moisture-sensitive; if stored improperly before reflow, popcorning during assembly can crack the die. Always bake per J-STD-033 if exposed to >30% RH for >1 year. For field reliability, apply conformal coating to prevent condensation-induced leakage on the SSOP leads in high-humidity environments.
How does the ADS7844EB compare to the newer ADS7042 from TI in terms of power, noise, and design-in effort for a low-power data logger using a 3.3V rail?
While the ADS7844EB offers higher channel count (4/8 inputs vs. ADS7042’s single channel) and faster throughput (200kSPS vs. 1MSPS burst but lower sustained rate), the ADS7042 consumes significantly less power (12µA typical vs. ~1mA for ADS7844EB) and includes an internal reference, simplifying layout. However, the ADS7844EB provides better noise performance in multi-channel scanning due to its sample-and-hold per channel. For battery-powered loggers with multiple sensors, the ADS7844EB may still be preferable if power budget allows and channel isolation is critical. If migrating, note that the ADS7042 uses a simpler 3-wire SPI, reducing MCU pin count but requiring careful attention to clock synchronization during high-speed bursts.
What precautions should I take when routing the analog input traces to the ADS7844EB’s MUX inputs in a mixed-signal PCB with digital SPI lines running nearby?
To prevent crosstalk and maintain 12-bit accuracy on the ADS7844EB, keep analog input traces short and away from digital SPI lines (SCLK, DIN, CS). Use a solid ground plane beneath the ADC and route analog signals orthogonally to digital traces if they must cross. Place the external reference voltage (VREF) capacitor (<10nF ceramic) within 2mm of the REF pin to minimize noise coupling into the SAR core. Avoid running high-current return paths under the ADS7844EB’s analog section. If using single-ended mode, tie unused MUX inputs to AGND through 10kΩ resistors to prevent floating nodes from coupling noise. These steps reduce INL errors that aren’t evident in datasheet specs but manifest in real-world EMI-rich environments.
Is it safe to share the ADS7844EB’s external reference voltage with other precision analog components like op-amps or DACs in a 3.3V system, and what are the stability implications?
Sharing the external reference with other precision components is possible but risky without proper buffering. The ADS7844EB draws dynamic current during conversions, which can modulate a shared reference if not isolated. Use a low-noise, high-PSRR reference buffer (e.g., REF3033 + OPA333) to drive both the ADS7844EB’s REF pin and other devices. Ensure total load current stays within the buffer’s capability and that trace impedance is minimized. Without buffering, code transitions on the ADS7844EB can induce glitches on the reference, degrading SNR and causing non-monotonic behavior in downstream DACs. Always decouple the reference at each load point with 100nF X7R capacitors to suppress high-frequency noise.
Quality Assurance (QC)
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ADS7844EB CAD Models
Texas Instruments ADS7844EB PCB symbols & footprints
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