Part A
ADS7844E/2K5
德州儀器
- Lifecycle
- Active
- Stock
- 3096 件
- Package
- SSOP-20
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS7841E/2K5G4 is a functional replacement candidate for the ADS7844E/2K5 in many applications, sharing the same 12-bit SAR architecture, 200 kSPS throughput, and 16-pin SSOP footprint. However, the ADS7844E/2K5 provides four single-ended or two pseudo-differential input channels, while the ADS7841E/2K5G4 offers four single-ended or two differential channels, so channel configuration and input topology must be validated against the target design before substitution.
Resolution and Throughput
High match
Package and Pinout
High match
Input Channel Configuration
Validation required
Supply Voltage Range
High match
Parts at a glance
Part B
ADS7841E/2K5G4
德州儀器
- Lifecycle
- Active
- Stock
- 5974 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 | ADS7844E/2K5 | ADS7841E/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, so it is not a drop-in substitute where 8-channel capability is required. |
| Resolution | 12 bit | 12 bit | Both provide 12-bit resolution, so measurement precision is equivalent and this parameter does not block substitutability. |
| 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 from common 3 V or 5 V rails without circuit changes. |
| Interface Type | SPI / Serial | SPI / Serial | Both use a serial SPI-compatible interface, so the host microcontroller connection is compatible. |
| Package / Mounting | 20-pin SSOP (Surface Mount) | 16-pin SSOP (Surface Mount) | Different pin counts and footprints mean the PCB layout must be redesigned; they are not physically interchangeable. |
| Input Type | Single-ended / Differential | Single-ended / Differential | Both support single-ended and differential inputs, preserving flexibility in signal conditioning design. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature range ensures both parts suit the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7844E/2K5 | ADS7841E/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 ADS7841E/2K5G4?
The ADS7844E/2K5 is an 8-channel, 12-bit successive-approximation ADC with a serial interface, while the ADS7841E/2K5G4 is a 4-channel, 12-bit SAR ADC. The ADS7844 provides twice the input channel count of the ADS7841, but both share the same 12-bit resolution and similar serial interface architecture. The ADS7841E/2K5G4 is supplied in a Green (RoHS-compliant) package variant per the G4 suffix.
Do the ADS7844E/2K5 and ADS7841E/2K5G4 have the same package and pinout?
Both devices are offered in a 16-pin SSOP (DBQ) package, but their pin functions differ because the ADS7844 supports 8 input channels while the ADS7841 supports 4. The channel-select and input configuration pins are not pin-for-pin interchangeable, so PCB layouts and control firmware must be validated separately for each device.
What is the resolution and sampling architecture of these two ADCs?
Both the ADS7844E/2K5 and ADS7841E/2K5G4 are 12-bit successive-approximation register (SAR) analog-to-digital converters. They provide 12-bit resolution over a serial SPI-compatible interface, making them suitable for medium-resolution data acquisition and touch-screen or sensor digitization applications.
How do the input channel counts compare between the ADS7844E/2K5 and ADS7841E/2K5G4?
The ADS7844E/2K5 provides 8 analog input channels, configurable as single-ended or differential pairs. The ADS7841E/2K5G4 provides 4 analog input channels, also configurable as single-ended or differential. Designs requiring more than four sensor inputs should select the ADS7844, while the ADS7841 is sufficient for four-channel applications.
Are the ADS7844E/2K5 and ADS7841E/2K5G4 drop-in replacements for each other?
No. Although both are 12-bit SAR ADCs in 16-pin SSOP packages, the differing channel counts and pin functions mean they are not drop-in replacements. A substitution requires verifying pin assignments, control-word format, and firmware configuration against the respective manufacturer datasheets before use in an existing design.
What does the G4 suffix on the ADS7841E/2K5G4 indicate?
The G4 suffix denotes a Green (RoHS-compliant, lead-free) package and ordering variant from Texas Instruments. The ADS7844E/2K5 is ordered under its own part number without the G4 designation. Designers should confirm the exact environmental compliance and packaging documentation for each orderable part number from the manufacturer.
What supply voltage and interface do these converters use?
Both the ADS7844E/2K5 and ADS7841E/2K5G4 operate from a single supply in the 2.7 V to 5.25 V range and communicate over a serial SPI-compatible interface. The wide supply range allows direct interfacing with common 3.3 V and 5 V microcontrollers and DSPs. Always confirm exact limits against the current manufacturer datasheet.