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ADS7844NB
Texas Instruments
IC ADC 12BIT SAR 20SSOP
2015 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
- (308 Ratings)
ADS7844NB
Product Overview
1437250
DiGi Electronics Part Number
ADS7844NB-DGManufacturer
Texas Instruments
ADS7844NB
Description
IC ADC 12BIT SAR 20SSOPInventory
2015 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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ADS7844NB 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 (0.209", 5.30mm Width)
Supplier Device Package
20-SSOP
Mounting Type
Surface Mount
Base Product Number
ADS7844
Datasheet & Documents
Manufacturer Product Page
ADS7844NB Specifications
HTML Datasheet
ADS7844NB-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
-ADS7844NBG4-NDR
ADS7844NB-NDR
2156-ADS7844NB
-ADS7844NB-DG
-ADS7844NBG4
TEXBURADS7844NB
-ADS7844NB-NDR
Standard Package
70
Alternative Parts
View DetailsPART 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
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de desembre 02, 2025
Das After-Sales-Team sorgt dafür, dass alle Fragen prompt geklärt werden, was ich sehr schätze.
de desembre 02, 2025
Low prices combined with strong after-sales support make them reliable.
de desembre 02, 2025
Their shipping timelines are accurate, and packaging is consistently high quality.
de desembre 02, 2025
The customer service team at DiGi Electronics is truly professional and always helpful.
de desembre 02, 2025
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Excellent after-sales service; they always address issues promptly.
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de desembre 02, 2025
Speedy delivery complemented by excellent after-sales service—highly recommended.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the ADS7844NB in a noisy industrial environment with long sensor leads?
When integrating the ADS7844NB in noisy environments with long sensor lines, the primary risk is signal integrity degradation due to EMI pickup, especially since the ADC accepts both single-ended and differential inputs. While the differential mode helps reject common-mode noise, poor PCB layout or unshielded cables can negate this advantage. To mitigate risks, use twisted-pair wiring for differential signals, add RC filtering (e.g., 100Ω series resistor with 100pF capacitor) at the ADS7844NB input pins, and ensure a solid ground plane. Also, keep digital traces (especially SPI) short and separate from analog paths to prevent coupling into the 12-bit SAR core. Consider driving the inputs with a low-noise operational amplifier (e.g., OPA333) to buffer high-impedance or remote sensors and maintain effective resolution.
Can the ADS7844NB replace the ADS7844N in an existing design without any circuit modifications?
Yes, the ADS7844NB is a direct function and pin-compatible replacement for the ADS7844N, both being 12-bit SAR ADCs in the 20-SSOP package with identical specifications for supply voltage (2.7V to 5V), SPI interface, and input configurations. However, verify the MSL (Moisture Sensitivity Level) difference—ADS7844NB is MSL2 (1 year floor life), which requires proper storage and handling in humid environments. Also, confirm that your reflow profile aligns with the newer device’s moisture sensitivity to avoid popcorning. No circuit changes are needed, but update your BOM and procurement sourcing to reflect the NB suffix variant for long-term availability and RoHS3 compliance.
How does the external reference requirement of the ADS7844NB impact accuracy in battery-powered applications?
The ADS7844NB requires an external voltage reference, which introduces potential accuracy drift in battery-powered systems as the battery voltage declines over time. Unlike ADCs with internal references, the ADS7844NB's conversion accuracy directly depends on the stability of the external reference (e.g., REF3030 or LM4040). If powered from a degrading battery, both the analog supply and reference may drop, leading to nonlinear measurement errors. To maintain accuracy, use a low-quiescent-current precision reference with tight initial tolerance (<0.5%) and low tempco (<50ppm/°C), and power the reference from a regulated LDO rather than directly from the battery. This ensures consistent 12-bit performance even under dynamic load or temperature shifts.
What are the trade-offs between using the ADS7844NB and pin-compatible alternatives like the MCP3204 in data acquisition systems?
Compared to the Microchip MCP3204—a similar 12-bit, 200kSPS SAR ADC—the ADS7844NB offers better performance in temperature stability (-40°C to 85°C) and supply flexibility (supporting both 3.3V and 5V operation), but requires an external reference, whereas the MCP3204 includes an optional internal reference. The ADS7844NB also supports more input configurations (multiplexed single-ended and differential) versus only single-ended on the MCP3204, making it more flexible for mixed-signal sensing. However, the MCP3204 typically consumes less power in sleep mode. For designs prioritizing noise immunity and flexible input types, the ADS7844NB is superior, but if power efficiency and simplified BOM are critical, compare with MCP3204 and validate SPI timing margins, as clock rates and CS timing differ slightly.
What PCB layout practices minimize crosstalk and grounding issues when routing the ADS7844NB in a mixed-signal design?
To minimize crosstalk and grounding issues with the ADS7844NB, implement a strict split between analog and digital ground planes, joining them at a single point near the device’s AGND and DGND pins. Use a dedicated analog ground pour under the 20-SSOP package and route analog inputs with 50-ohm controlled impedance traces if possible. Avoid running digital SPI lines beneath or adjacent to analog input traces—maintain at least 3x trace width spacing. Place a low-ESR 10μF ceramic capacitor in parallel with a 100nF capacitor as close as possible to the AVDD and DVDD pins. Additionally, minimize the trace length to the external reference and shield it if necessary. These steps preserve the 12-bit effective resolution by reducing digital switching noise coupling into the SAR core of the ADS7844NB.
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ADS7844NB CAD Models
Texas Instruments ADS7844NB PCB symbols & footprints
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