Part A
ADS7846E
德州儀器
- Lifecycle
- Active
- Stock
- 5291 件
- Package
- SSOP-16
- Series
- 資料獲取-觸控式螢幕控制器
Replacement verdict
Not a drop-in replacement
The ADS7846E and ADS7841ES/2K5G4 are not drop-in replacements for one another. Although both are 12-bit SAR analog-to-digital converters from Texas Instruments in a 16-pin SSOP package, they differ in input channel configuration, integrated touch-screen controller functionality, and serial interface protocol, requiring design validation before any substitution.
Different input channel configuration
Different integrated features
Different serial interface protocol
Different pin function assignment
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 | ADS7846E | ADS7841ES/2K5G4 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit SAR ADCs, so conversion resolution is equivalent for substitutability. |
| Number of Input Channels | 4 single-ended / 2 differential (with touchscreen drivers) | 4 single-ended / 2 differential | Channel count determines how many analog signals can be multiplexed; the ADS7846 adds touchscreen control logic on top of the ADC channels. |
| Interface | SPI (serial) | SPI (serial) | Both use a serial SPI-compatible interface, allowing similar microcontroller connections. |
| Supply Voltage | 2.2 V to 5.25 V | 2.7 V to 5.25 V | The wider low-voltage range of the ADS7846 allows operation down to 2.2 V, which can matter in battery-powered designs. |
| Integrated Touchscreen Controller | Yes (4-wire resistive touchscreen controller) | No | The ADS7846 includes on-chip touchscreen drive and control circuitry, while the ADS7841 is a plain ADC; this is a major functional difference affecting substitutability. |
| Package | SSOP-16 (DBQ) | SSOP-16 (DBQ) | Matching package and pin count simplifies PCB footprint compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature range supports use in the same environments. |
| Sampling Rate | Up to 125 kSPS | Up to 200 kSPS | The ADS7841 offers a higher maximum throughput, which may matter for faster signal acquisition requirements. |
| Internal Reference | Yes (2.5 V internal reference) | Yes (2.5 V internal reference) | Both provide an on-chip reference, reducing external component count and simplifying design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7846E | ADS7841ES/2K5G4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | - | 12 |
| Sampling Rate(Per Second) | - | 200k |
| Number of Inputs | - | 4 |
| Input Type | - | 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 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Touchscreen | 4 Wire Resistive | - |
| Resolution(Bits) | 12 b | - |
| Interface | SPI | - |
| Voltage Reference | External, Internal | - |
| Voltage - Supply | 2.2V ~ 5.25V | - |
| Supply Current | 500 µA | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
What are the key architectural differences between the ADS7846E and ADS7841ES/2K5G4?
The ADS7846E is a 4-wire touch screen controller with an integrated 12-bit successive-approximation ADC, on-chip drivers for touch panel excitation, and a battery monitor input, housed in a 16-pin SSOP package. The ADS7841ES/2K5G4 is a standalone 12-bit, 4-channel successive-approximation ADC with a serial interface, supplied in a 16-pin SSOP and shipped in tape-and-reel (2K5) form. The ADS7846E integrates touch-screen control functions, while the ADS7841ES/2K5G4 is a general-purpose 4-channel ADC without touch-screen drive circuitry.
Are the ADS7846E and ADS7841ES/2K5G4 pin-compatible?
No. Although both devices are offered in 16-pin SSOP packages, their pin functions differ. The ADS7846E includes touch-screen drive outputs (X+, X-, Y+, Y-) and a battery monitor input, whereas the ADS7841ES/2K5G4 provides four analog input channels (CH0–CH3) with a different serial control and reference arrangement. Pin functions and control-word formats are not interchangeable, so the devices cannot be treated as pin-compatible substitutes.
Can the ADS7841ES/2K5G4 be used as a drop-in replacement for the ADS7846E in a touch-screen application?
No. The ADS7841ES/2K5G4 lacks the integrated touch-screen drive circuitry and the dedicated touch-panel control logic present in the ADS7846E. A touch-screen design requires the panel excitation and coordinate measurement functions provided by the ADS7846E; the ADS7841ES/2K5G4 alone cannot drive a resistive touch panel without additional external circuitry. Replacement requires design changes and validation against the manufacturer datasheets.
What are the resolution and sampling characteristics of these two ADCs?
Both devices are 12-bit successive-approximation ADCs. The ADS7846E provides 12-bit resolution for touch-screen coordinate and auxiliary measurements, while the ADS7841ES/2K5G4 provides 12-bit resolution across its four analog input channels. Both use a serial interface for control and data transfer. Designers should consult the respective manufacturer datasheets for exact throughput and timing specifications, as these are defined per device.
What supply voltage and interface do these devices use?
Both the ADS7846E and ADS7841ES/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 ADS7846E additionally supports touch-panel drive and a battery monitor input within that supply range. Exact supply and interface timing limits should be verified in the official manufacturer datasheets for each part number.
What package and ordering differences exist between the ADS7846E and ADS7841ES/2K5G4?
Both parts are offered in a 16-pin SSOP package. The ADS7846E suffix "E" denotes the SSOP package option. The ADS7841ES/2K5G4 suffix indicates the SSOP package ("ES") plus tape-and-reel packaging ("2K5") and a "G4" lead-free/RoHS-compliant finish designation. Buyers should confirm the exact package and packing option against the manufacturer's ordering information before procurement.
Which device should be selected for a general-purpose multi-channel ADC application?
For a general-purpose 4-channel 12-bit ADC application without touch-screen requirements, the ADS7841ES/2K5G4 is the appropriate choice because it provides four analog input channels and a serial interface in a compact SSOP package. The ADS7846E is intended specifically for touch-screen controller applications where integrated panel drive and coordinate measurement are required. Selection should be based on the system's functional requirements and verified datasheet parameters.