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ADS7844E/2K5G4
Texas Instruments
IC ADC 12BIT SAR 20SSOP
1491 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
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ADS7844E/2K5G4
Product Overview
1259553
DiGi Electronics Part Number
ADS7844E/2K5G4-DGManufacturer
Texas Instruments
ADS7844E/2K5G4
Description
IC ADC 12BIT SAR 20SSOPInventory
1491 Pcs New Original In Stock
12 Bit Analog to Digital Converter 4, 8 Input 1 SAR 20-SSOP
CAD Models - PCB Symbols & Footprints
Quantity
Minimum 1
Minimum 1
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ADS7844E/2K5G4 Technical Specifications
Category
Data Acquisition, Analog to Digital Converters (ADC)
Packaging
-
Series
-
Product Status
Discontinued at Digi-Key
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
ADS7844E/2K5G4 Specifications
HTML Datasheet
ADS7844E/2K5G4-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
Standard Package
2,500
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Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
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Dec 02, 2025
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Dec 02, 2025
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Dec 02, 2025
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Dec 02, 2025
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Dec 02, 2025
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the ADS7844E/2K5G4 in a mixed-voltage system with both 3.3V and 5V logic levels?
The ADS7844E/2K5G4 supports dual analog and digital supply ranges (2.7V to 3.6V or 5V), but care must be taken to avoid level mismatches. If the host microcontroller uses 3.3V logic while the ADS7844E/2K5G4 is powered at 5V, the SPI interface inputs (DIN, SCLK, etc.) are 5V-tolerant due to internal protection diodes, but excessive current can still damage the device if not current-limited. Use series resistors on control lines if driving from lower-voltage outputs, and ensure reference voltage (external) is stable and properly decoupled to avoid conversion errors. Mismatched ground potentials between analog and digital sections should also be minimized to prevent offset shifts in differential measurements.
How does the discontinued status of the ADS7844E/2K5G4 impact long-term reliability and PCB redesign planning?
Since the ADS7844E/2K5G4 is discontinued at distributors like Digi-Key, long-term supply is uncertain despite current stock availability. For new designs or revisions, consider immediate evaluation of pin-compatible alternatives such as the ADS7844EB/2K5 for engineering samples or migrate toward newer SAR ADCs with similar performance. If continuing with existing inventory, implement lifetime buy planning and ensure robust solder reflow processes (MSL2 sensitivity) to avoid field failures. Assess obsolescence risk early to prevent costly redesigns later in product lifecycle.
Can the ADS7844E/2K5G4 replace the ADS7830 in a 12-bit acquisition system without changing the external reference circuit?
Yes, the ADS7844E/2K5G4 can functionally replace the ADS7830 for 12-bit conversions with higher throughput (200kSPS vs 57kSPS), but only if an external reference is already in place—both require external references. However, the ADS7844E/2K5G4 offers true differential inputs across all channels versus the ADS7830's pseudo-differential option, improving noise rejection. The change requires updating SPI command structure due to different control bits and channel sequencing. Verify timing compatibility in the acquisition phase, especially if driving from legacy firmware designed for slower ADCs.
What are the implications of using an external reference with the ADS7844E/2K5G4 in high-temperature environments up to 85°C?
Using an external reference with the ADS7844E/2K5G4 introduces sensitivity to reference stability under thermal drift. Since the ADC itself doesn't include an internal reference, choosing a low-drift, temperature-compensated reference (e.g., REF5025 or LM4040) is critical to maintain 12-bit accuracy at 85°C. Poor reference design can result in gain error, nonlinearity, or increased INL/DNL. Place the reference close to the REF input with adequate decoupling (10µF tantalum + 0.1µF ceramic), and avoid sharing reference lines with other ADCs or loads to prevent crosstalk during sampling transitions.
How does the multiplexed SAR architecture of the ADS7844E/2K5G4 affect signal integrity when switching between high-impedance sensors?
The MUX-S/H-ADC architecture in the ADS7844E/2K5G4 can introduce charge injection and settling challenges when switching between high-impedance sources (>1kΩ). To maintain 12-bit accuracy, ensure the input signal settles within the acquisition window (typically <1.5µs). Use an external buffer amplifier (e.g., OPA350) or increase acquisition time via external timing control if available. Avoid rapid channel switching without sufficient settling delay, as this can lead to crosstalk and measurement errors—especially critical when sampling sensors like thermocouples or RTDs through multiplexed inputs.
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ADS7844E/2K5G4 CAD Models
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