Part A
ADS7846E
Texas Instruments
- Lifecycle
- Active
- Stock
- 5291 Stückzahl
- Package
- SSOP-16
- Series
- Datenerfassung mit Touchscreen Controllern
Replacement verdict
Not a drop-in replacement
The ADS7846E and ADS7842E/1KG4 are not drop-in replacements for one another. Although both are 12-bit successive-approximation ADCs from Texas Instruments, they differ in resolution architecture, channel configuration, package footprint, and interface signaling, so the ADS7842E/1KG4 cannot be substituted directly for the ADS7846E without circuit and layout redesign.
Different channel configuration
Different package footprint
Different interface signaling
Different conversion architecture
Parts at a glance
Part B
ADS7842E/1KG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 9177 Stückzahl
- Package
- SSOP-28
- 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 | ADS7846E | ADS7842E/1KG4 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit SAR ADCs, so resolution is equivalent for substitutability. |
| Number of Input Channels | 4 (single-ended) / 2 (differential) | 4 (single-ended) / 2 (differential) | Channel count determines how many analog signals can be multiplexed into the ADC. |
| Interface Type | SPI (serial) | SPI (serial) | A matching serial interface allows drop-in replacement in the same digital bus architecture. |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Compatible supply range ensures the part operates in the same power domain. |
| Package / Mounting | TSSOP-16 (surface mount) | TSSOP-16 (surface mount) | Identical package and footprint enable direct PCB replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ratings confirm suitability for the same environmental conditions. |
| Sampling Rate | 125 kSPS | 125 kSPS | Equivalent throughput supports the same signal bandwidth and timing requirements. |
| Internal Reference | Yes (2.5 V) | Yes (2.5 V) | An on-chip reference simplifies design and keeps full-scale accuracy consistent between parts. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7846E | ADS7842E/1KG4 |
|---|---|---|
| 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 | - | Parallel |
| 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 | - | Selectable Address |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°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 primary functional differences between the ADS7846E and ADS7842E/1KG4?
The ADS7846E is a 4-wire resistive touch screen controller with an integrated 12-bit successive-approximation ADC, on-chip temperature sensor, and SPI-compatible serial interface. The ADS7842E/1KG4 is a 12-bit, 4-channel sampling analog-to-digital converter with a parallel interface. The ADS7846E is designed for touch-screen digitizer applications, while the ADS7842E/1KG4 is a general-purpose 4-channel ADC. They are not functionally interchangeable.
Do the ADS7846E and ADS7842E/1KG4 have the same package and pinout?
No. The ADS7846E is offered in a 16-pin SSOP package, while the ADS7842E/1KG4 is offered in a 20-pin SSOP package. The pin counts and pin functions differ, so the two devices are not pin-compatible and cannot be dropped into the same PCB footprint.
What are the resolution and sampling specifications of each device?
Both devices provide 12-bit resolution. The ADS7846E supports a throughput rate up to 125 kSPS. The ADS7842E/1KG4 supports a sampling rate up to 200 kSPS. These figures should be confirmed against the respective manufacturer datasheets for the specific grade and operating conditions.
How do the host interfaces of the ADS7846E and ADS7842E/1KG4 differ?
The ADS7846E uses an SPI-compatible serial interface for communication with a host microcontroller. The ADS7842E/1KG4 uses a parallel interface with a data bus and control lines. This difference affects firmware, pin count, and board routing, and is a key reason the parts are not directly substitutable.
Can the ADS7846E be used as a general-purpose 4-channel ADC like the ADS7842E/1KG4?
The ADS7846E is optimized for touch-screen controller operation and includes touch-specific features such as pen-interrupt and reference control. The ADS7842E/1KG4 is a dedicated 4-channel sampling ADC with a parallel interface. Because of differences in interface, package, and intended application, the ADS7846E should not be treated as a direct substitute for the ADS7842E/1KG4 in general-purpose ADC designs without full validation.
What supply voltage ranges do these devices support?
The ADS7846E operates from a single supply in the range of 2.2 V to 5.25 V. The ADS7842E/1KG4 operates from a single 5 V supply. Designers should verify the exact recommended operating conditions in the manufacturer datasheets before finalizing a design.
Are the ADS7846E and ADS7842E/1KG4 suitable for the same applications?
No. The ADS7846E is intended for resistive touch-screen digitizer applications such as handheld devices and PDAs. The ADS7842E/1KG4 is intended for general-purpose data acquisition requiring a 4-channel, 12-bit ADC with a parallel interface. Application requirements should be matched to the specific device features and interface type.