Part A
ADS7846E
Texas Instruments
- Lifecycle
- Active
- Stock
- 5291 Stückzahl
- Package
- SSOP-16
- Series
- Datenerfassung mit Touchscreen Controllern
Replacement verdict
Compatible functional replacement candidate
The ADS7846E is a functional upgrade candidate for the ADS7843E, sharing the same TSSOP-16 footprint, 12-bit SAR architecture, and 125 kHz throughput, while adding on-chip temperature sensing and a programmable internal reference. Designers should validate the SPI timing and reference configuration before substituting in existing ADS7843E sockets.
Package Type
High match
Resolution
High match
Reference Architecture
Validation required
Interface Timing
Validation required
Parts at a glance
Part B
ADS7843E
Burr Brown
- Lifecycle
- Active
- Stock
- 6691 Stückzahl
- Package
- SSOP-16
- Series
- Datenerfassung mit Touchscreen Controllern
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS7843E | ADS7846E | Why it matters |
|---|---|---|---|
| Resolution | 12-bit | 12-bit | Both provide 12-bit SAR conversion, so touch coordinate resolution is equivalent for substitutability. |
| Touch Screen Interface | 4-wire resistive touch | 4-wire resistive touch plus direct temperature and battery monitoring | The ADS7846E adds auxiliary inputs for temperature and battery measurement, offering extra system functions beyond touch sensing. |
| On-chip Temperature Sensor | No | Yes | The ADS7846E integrates a temperature sensor, which the ADS7843E lacks, affecting system-level sensing capability. |
| Battery Monitor Input | No | Yes | The ADS7846E can monitor battery voltage directly, a function not available on the ADS7843E. |
| On-chip Reference | External reference required | Internal 2.5 V reference (with external option) | The ADS7846E's internal reference simplifies design and reduces external component count compared to the ADS7843E. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.2 V to 5.25 V | The ADS7846E supports a lower minimum supply voltage, enabling operation in lower-power or battery-critical designs. |
| Serial Interface | SPI-compatible (12-bit) | SPI-compatible (12-bit or 8-bit) | The ADS7846E offers selectable 8-bit or 12-bit conversion results, providing flexibility the ADS7843E does not. |
| Package | 16-pin SSOP | 16-pin SSOP | Identical package and pin count support drop-in compatibility for board layout. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Equivalent temperature ratings ensure both parts suit the same industrial and commercial environments. |
| Power Consumption (typical) | Lower (no aux/temp circuitry) | Slightly higher (includes temp and battery monitor) | The added functions in the ADS7846E may increase power draw, which matters for battery-powered applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7846E | ADS7843E |
|---|---|---|
| Part Status | Active | Active |
| Touchscreen | 4 Wire Resistive | 3 Wire Capacitive |
| Resolution(Bits) | 12 b | 12 b |
| Interface | SPI | Serial |
| Voltage Reference | External, Internal | External |
| Voltage - Supply | 2.2V ~ 5.25V | 2.7V ~ 5V |
| Supply Current | 500 µA | 280 µA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADS7843E and ADS7846E touch screen controllers?
The ADS7843E is a 4-wire resistive touch screen controller with a 12-bit SAR ADC and an SPI-compatible serial interface. The ADS7846E adds on-chip functionality including an internal 2.5 V reference, a temperature sensor, an auxiliary ADC input, and a battery monitor input, while also supporting the same 4-wire touch screen interface and SPI communication. Both are available in a 16-pin SSOP package.
Are the ADS7843E and ADS7846E pin-compatible?
No. Although both devices are offered in a 16-pin SSOP package, the pin functions differ. The ADS7846E includes additional pins for the internal reference, temperature sensor, auxiliary input, and battery monitor that are not present on the ADS7843E. A direct drop-in replacement is not possible without verifying pin assignments against the respective datasheets.
Do both devices use the same SPI interface and resolution?
Yes. Both the ADS7843E and ADS7846E use a 12-bit successive-approximation ADC and communicate over an SPI-compatible serial interface. Both support the same touch screen coordinate measurement modes for 4-wire resistive panels.
Does the ADS7846E include an internal voltage reference that the ADS7843E lacks?
Yes. The ADS7846E integrates an on-chip 2.5 V reference, whereas the ADS7843E requires an external reference voltage to be supplied to its VREF pin. This difference affects the external component count and the reference accuracy of the overall design.
What additional features does the ADS7846E offer beyond touch screen conversion?
The ADS7846E includes a temperature sensor, an auxiliary ADC input, and a battery monitor input, in addition to the 4-wire touch screen controller. The ADS7843E is limited to touch screen coordinate and pressure measurement and does not include these auxiliary functions.
Can the ADS7843E and ADS7846E operate at the same supply voltage?
Both devices operate from a single supply in the range of 2.2 V to 5.25 V, as specified in their respective datasheets. However, the ADS7846E's internal reference and auxiliary functions should be evaluated against the chosen supply voltage and system requirements.
Which device should be selected for a design requiring an on-chip reference and battery monitoring?
The ADS7846E should be selected when an integrated 2.5 V reference, temperature sensing, auxiliary ADC input, or battery monitor is required, since these functions are not available on the ADS7843E. The ADS7843E is appropriate for simpler 4-wire touch screen designs that provide an external reference.