Part A
ADS1246IPW
德州儀器
- Lifecycle
- Active
- Stock
- 6549 件
- Package
- TSSOP-16
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADS1246IPW and ADS1286UG4 are not drop-in replacements for one another. They differ in resolution, input architecture, digital interface, and package footprint, so substituting one for the other requires a full schematic and layout redesign rather than a direct swap.
Different resolution
Different input architecture
Different digital interface
Different package footprint
Parts at a glance
Part B
ADS1286UG4
德州儀器
- Lifecycle
- Active
- Stock
- 7130 件
- Package
- SOIC-8
- 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 | ADS1246IPW | ADS1286UG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 12 | Resolution determines the smallest signal change the ADC can distinguish; a 24-bit device offers far finer measurement granularity than a 12-bit device. |
| Number of input channels | 1 (single-ended/differential) | 1 (differential) | Channel count and input configuration define how many signals can be measured and whether single-ended or differential sensors can be connected. |
| Interface type | SPI | SPI | The digital interface must match the host microcontroller; both use SPI, but timing and protocol details differ between families. |
| Supply voltage (analog) | 2.7 V to 5.25 V | 4.5 V to 5.5 V | Operating supply range determines compatibility with the system power rail; the ADS1246 supports lower-voltage rails while the ADS1286 requires a nominal 5 V supply. |
| Package type | TSSOP-16 | SOIC-8 | Package footprint and pin count affect PCB layout and whether the parts are drop-in compatible on an existing board. |
| Operating temperature range | -40 °C to +105 °C | -40 °C to +85 °C | The temperature range defines the environments in which the part can reliably operate; the wider range of the ADS1246 suits harsher conditions. |
| Internal PGA / gain stage | Yes (PGA, gains 1 to 128) | No | An integrated programmable gain amplifier allows direct amplification of small sensor signals, simplifying the analog front end; the ADS1286 lacks this feature. |
| Data rate (max) | 2 kSPS | 20 kSPS | Maximum sample rate sets the achievable signal bandwidth; the ADS1286 samples faster but at lower resolution, while the ADS1246 trades speed for precision. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1246IPW | ADS1286UG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 24 | 12 |
| Sampling Rate(Per Second) | 2k | 20k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential, Single Ended | Differential |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | S/H-ADC |
| Ratio - S / H: ADC | - | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | SAR |
| Reference Type | External, Internal | External |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 5V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
| Features | PGA, Temperature Sensor | - |
Frequently asked questions
What are the primary functional differences between the ADS1246IPW and ADS1286UG4?
The ADS1246IPW is a 24-bit, single-channel delta-sigma analog-to-digital converter with an integrated programmable gain amplifier (PGA) and SPI interface, housed in a TSSOP-16 package. The ADS1286UG4 is a 12-bit, single-channel successive-approximation register (SAR) ADC with a serial interface, housed in a SOIC-8 package. The ADS1246 targets high-resolution, low-frequency sensor measurement, while the ADS1286 targets general-purpose, higher-speed data acquisition.
Do the ADS1246IPW and ADS1286UG4 have compatible package footprints for direct PCB replacement?
No. The ADS1246IPW uses a TSSOP-16 package, while the ADS1286UG4 uses a SOIC-8 package. The pin counts, pin functions, and PCB land patterns differ, so neither device can be dropped directly into the other's footprint without a board redesign.
How do the resolution and architecture of the ADS1246IPW and ADS1286UG4 compare?
The ADS1246IPW provides 24-bit resolution using a delta-sigma architecture, which is suited to low-noise, high-precision measurements of slowly varying signals. The ADS1286UG4 provides 12-bit resolution using a SAR architecture, which is suited to faster conversions of moderate-resolution signals. The two devices are not interchangeable in applications where resolution or conversion architecture is critical.
What are the supply voltage requirements for the ADS1246IPW and ADS1286UG4?
The ADS1246IPW operates from an analog supply of 2.7 V to 5.25 V and a digital supply of 2.7 V to 5.25 V. The ADS1286UG4 operates from a single supply of 4.5 V to 5.5 V. Designs must verify that the available supply rails meet the respective device requirements before substitution is considered.
Do the ADS1246IPW and ADS1286UG4 use the same digital interface protocol?
Both devices use a serial interface, but the protocols differ. The ADS1246IPW uses an SPI-compatible interface with dedicated command and data framing. The ADS1286UG4 uses a simpler serial interface with a chip-select and serial clock arrangement. Firmware and host controller timing must be revalidated when migrating between the two devices.
Can the ADS1246IPW and ADS1286UG4 be used interchangeably in precision sensor applications?
No. The ADS1246IPW includes an integrated PGA and offers 24-bit resolution, making it suitable for low-level sensor signals requiring high precision. The ADS1286UG4 is a 12-bit SAR converter without an integrated PGA, so it does not provide the same resolution or signal conditioning capability. Interchangeability requires full validation against the target application's accuracy and signal-chain requirements.
What are the maximum sampling rates of the ADS1246IPW and ADS1286UG4?
The ADS1246IPW supports programmable data rates up to 2 kSPS. The ADS1286UG4 supports a maximum sampling rate of 200 kSPS. The large difference in throughput means the devices serve different application classes and cannot be substituted where conversion speed is a design constraint.