Part A
ADS7844EB
德州儀器
- Lifecycle
- Active
- Stock
- 3681 件
- Package
- SSOP-20
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS7841ES/2K5G4 is a functional replacement candidate for the ADS7844EB in many 12-bit SAR ADC applications, but it is not a drop-in substitute. The ADS7844EB provides a 4-channel differential input multiplexer with a serial interface, while the ADS7841ES/2K5G4 offers a single-channel pseudo-differential input configuration. Designers must validate channel count, input configuration, package footprint, and interface timing against the target application before substituting.
Channel Count
Validation required
Input Configuration
Validation required
Package Type
Validation required
Resolution
High match
Parts at a glance
Part B
ADS7841ES/2K5G4
德州儀器
- Lifecycle
- Active
- Stock
- 7893 件
- Package
- SSOP-16
- Series
- 資料獲取-模數轉換器（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 | ADS7844EB | 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 measured; the ADS7844 supports twice as many channels, which affects system architecture and multiplexing needs. |
| Resolution | 12 bit | 12 bit | Both provide 12-bit resolution, so measurement precision is equivalent and no redesign of the digital interface width is required. |
| Sampling Rate | 200 kSPS | 200 kSPS | Identical throughput means timing budgets and anti-aliasing filter design remain valid when substituting one part for the other. |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Matching supply ranges allow the parts to operate from the same rail without level shifting or regulator changes. |
| Interface Type | SPI / QSPI / Microwire compatible serial | SPI / QSPI / Microwire compatible serial | Same serial interface protocol means the host microcontroller firmware and wiring can be reused without modification. |
| Package | 20-pin SSOP | 16-pin SSOP | Different pin counts and footprints require PCB layout changes; the parts are not drop-in replacements at the board level. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent temperature ratings ensure both parts suit the same industrial environments and reliability requirements. |
| Input Type | Single-ended and differential | Single-ended and differential | Both support differential inputs, which is important for rejecting common-mode noise in sensor and industrial measurement applications. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7844EB | 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 ADS7844EB and ADS7841ES/2K5G4?
The ADS7844EB is an 8-channel, 12-bit sampling analog-to-digital converter, while the ADS7841ES/2K5G4 is a 4-channel, 12-bit sampling ADC. Both are successive-approximation register (SAR) converters from Texas Instruments with a serial SPI/QSPI/Microwire interface, but they differ in input channel count, package, and operating temperature grade.
How many analog input channels does each device provide?
The ADS7844EB provides 8 single-ended or 4 differential analog input channels. The ADS7841ES/2K5G4 provides 4 single-ended or 2 differential input channels.
What is the resolution and sampling rate of these ADCs?
Both the ADS7844EB and ADS7841ES/2K5G4 are 12-bit SAR ADCs with a maximum throughput of 200 kSPS when operating from a 5 V supply.
What package types are used for the ADS7844EB and ADS7841ES/2K5G4?
The ADS7844EB is offered in a 20-lead SSOP (DB) package. The ADS7841ES/2K5G4 is offered in a 16-lead QSOP (DBQ) package, supplied in tape-and-reel form (2K5 suffix).
What are the supply voltage and reference requirements for these converters?
Both devices operate from a single 2.7 V to 5.25 V analog supply (VCC) and a separate 2.7 V to 5.25 V digital supply (VDD). The external reference voltage (VREF) ranges from 0.5 V to VCC, and the analog input range is 0 V to VREF.
What are the operating temperature ranges for the ADS7844EB and ADS7841ES/2K5G4?
The ADS7844EB is specified over the -40°C to +85°C industrial temperature range. The ADS7841ES/2K5G4 is also specified over the -40°C to +85°C industrial temperature range.
Can the ADS7844EB and ADS7841ES/2K5G4 be used interchangeably in an existing design?
No, they are not pin-for-pin or functionally interchangeable. The ADS7844EB has 20 pins and 8 input channels, while the ADS7841ES/2K5G4 has 16 pins and 4 input channels. A redesign of the PCB land pattern, channel configuration, and control firmware would be required.
What digital interface do these ADCs use?
Both devices use a serial interface compatible with SPI, QSPI, and Microwire protocols, with a maximum serial clock frequency of 2 MHz at 5 V supply.