Part A
ADS7844E/2K5
Texas Instruments
- Lifecycle
- Active
- Stock
- 3096 Stückzahl
- Package
- SSOP-20
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7841ES/2K5G4 is a functional replacement candidate for the ADS7844E/2K5 in many 12-bit SAR ADC applications, but it is not a drop-in substitute. The ADS7844E/2K5 provides an 8-channel input multiplexer in a 20-pin SSOP package, while the ADS7841ES/2K5G4 offers a 4-channel multiplexer in a 16-pin SSOP package with a different serial interface configuration. Designers must verify channel count requirements, pinout compatibility, and interface timing before substituting, and should confirm that the reduced channel count and package footprint are acceptable for the target design.
Channel Count
Validation required
Package Type
Validation required
Resolution
High match
Serial Interface
Validation required
Parts at a glance
Part B
ADS7841ES/2K5G4
Texas Instruments
- Lifecycle
- Active
- Stock
- 7893 Stückzahl
- Package
- SSOP-16
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS7844E/2K5 | ADS7841ES/2K5G4 | Why it matters |
|---|---|---|---|
| Number of Input Channels | 8 (single-ended) / 4 (differential) | 4 (single-ended) / 2 (differential) | Determines how many analog signals can be digitized; the ADS7844 supports twice as many channels, so it is not a drop-in replacement where 8 channels are required. |
| Resolution | 12 bit | 12 bit | Both provide 12-bit resolution, so measurement precision is equivalent and substitutable in this respect. |
| Sampling Rate | 200 kSPS | 200 kSPS | Identical throughput means timing and signal bandwidth requirements are met by either device. |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Same supply range allows operation in the same system rails without level shifting. |
| Interface | SPI / QSPI / Microwire compatible serial | SPI / QSPI / Microwire compatible serial | Identical serial interface protocol enables reuse of the same microcontroller firmware and bus wiring. |
| Package | SSOP-20 (DBQ) | SSOP-16 (DBQ) | Different pin counts and footprints mean the PCB layout must be redesigned; they are not physically interchangeable. |
| Input Type | Single-ended and differential | Single-ended and differential | Both support differential inputs, preserving common-mode rejection capability in the same applications. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range ensures equivalent environmental robustness. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7844E/2K5 | ADS7841ES/2K5G4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 200k | 200k |
| Number of Inputs | 4, 8 | 4 |
| Input Type | Differential, Single Ended | Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-S/H-ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the ADS7844E/2K5 and the ADS7841ES/2K5G4?
The ADS7844E/2K5 is an 8-channel, 12-bit successive-approximation ADC with a serial interface, housed in a 20-pin SSOP package. The ADS7841ES/2K5G4 is a 4-channel, 12-bit successive-approximation ADC with a serial interface, housed in a 16-pin SSOP package. The primary differences are channel count (8 vs. 4), package pin count (20 vs. 16), and the corresponding pinout and PCB footprint.
Are the ADS7844E/2K5 and ADS7841ES/2K5G4 pin-compatible?
No. The ADS7844E/2K5 uses a 20-pin SSOP package, while the ADS7841ES/2K5G4 uses a 16-pin SSOP package. The different pin counts and pinouts mean they are not drop-in replacements and require different PCB land patterns.
Do both devices share the same resolution and sampling architecture?
Yes. Both are 12-bit successive-approximation register (SAR) analog-to-digital converters with a serial SPI-compatible interface, operating from a single 2.7 V to 5.25 V supply, as specified in their respective Texas Instruments datasheets.
How do the input channel configurations differ between the two parts?
The ADS7844E/2K5 provides 8 input channels that can be configured as single-ended or differential pairs. The ADS7841ES/2K5G4 provides 4 input channels, also configurable as single-ended or differential pairs. Designs requiring more than four analog inputs must use the ADS7844E/2K5 or an external multiplexer.
Can the ADS7841ES/2K5G4 replace the ADS7844E/2K5 in an existing design?
Not directly. Because the ADS7841ES/2K5G4 has fewer channels and a different package and pinout, replacement requires PCB redesign, reduced channel count, and revalidation of the serial interface timing and reference configuration against the Texas Instruments datasheets for both devices.
What is the significance of the /2K5 and /2K5G4 suffixes on these part numbers?
The /2K5 suffix indicates tape-and-reel packaging in quantities of 2,500 units. The G4 suffix on the ADS7841ES/2K5G4 denotes a green (RoHS-compliant, lead-free) package variant per Texas Instruments ordering information. Buyers should confirm the exact ordering code and environmental status on the manufacturer or authorized distributor listing before purchase.
Which device should be selected for a design with four or fewer analog inputs?
The ADS7841ES/2K5G4 is the appropriate choice when four or fewer input channels are needed, since it provides the required 12-bit SAR conversion in a smaller 16-pin SSOP package. The ADS7844E/2K5 should be selected only when more than four channels are required.