Part A
ADS1246IPW
Техасские инструменты
- Lifecycle
- Active
- Stock
- 6549 ПКС
- Package
- TSSOP-16
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1246IPW and ADS1286UB/2K5 are not drop-in replacements for one another. The ADS1246IPW is a 24-bit delta-sigma ADC with an integrated PGA and SPI interface in a TSSOP-16 package, while the ADS1286UB/2K5 is a 12-bit successive-approximation ADC with a serial interface in an SOIC-8 package. Their resolution, conversion architecture, channel configuration, and footprint differ fundamentally, so substituting one for the other requires a full redesign of the signal chain, layout, and firmware rather than a direct swap.
Different resolution
Different ADC architecture
Different package and footprint
Different interface and control
Parts at a glance
Part B
ADS1286UB/2K5
Техасские инструменты
- Lifecycle
- Active
- Stock
- 8439 ПКС
- Package
- SOIC-8
- Series
- Сбор данных - аналогово-цифровые преобразователи (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 | ADS1286UB/2K5 | 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 differential | 1 differential | Both are single-channel devices, so channel count is not a differentiator for substitutability. |
| Interface type | SPI | SPI | Both use SPI, so the host microcontroller interface is compatible between the two parts. |
| Supply voltage (analog) | 2.7 V to 5.25 V | 4.5 V to 5.5 V | The ADS1246 supports lower supply voltages, allowing operation in 3.3 V systems where the ADS1286 would not function. |
| Package | 16-TSSOP | 8-SOIC | Different package footprints and pin counts mean the parts are not drop-in replacements on an existing PCB. |
| Input type | Differential | Differential | Both accept differential inputs, so signal conditioning topology can remain similar. |
| Internal PGA | Yes (gain 1 to 128) | No | The ADS1246's programmable gain amplifier allows direct connection of low-level sensors, whereas the ADS1286 requires external amplification. |
| Data rate (max) | 2 kSPS | 20 kSPS | The ADS1286 offers a higher maximum sample rate, which matters for faster-changing signals, while the ADS1246 trades speed for resolution. |
| Operating temperature range | -40 °C to +105 °C | -40 °C to +85 °C | The wider temperature range of the ADS1246 suits harsher environments where the ADS1286 may exceed its rated limits. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1246IPW | ADS1286UB/2K5 |
|---|---|---|
| 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 key architectural differences between the ADS1246IPW and the ADS1286UB/2K5?
The ADS1246IPW is a 24-bit delta-sigma analog-to-digital converter with a built-in programmable gain amplifier (PGA) and an SPI-compatible serial interface, housed in a TSSOP-16 package. The ADS1286UB/2K5 is a 12-bit successive-approximation register (SAR) ADC with a pseudo-differential input and a serial interface, supplied in a SOIC-8 package. The ADS1246 targets high-resolution, low-frequency measurement applications, while the ADS1286 targets faster, lower-resolution data acquisition.
How do the resolution and data rate specifications compare between the ADS1246IPW and ADS1286UB/2K5?
The ADS1246IPW provides 24-bit resolution with a programmable data rate up to 2 kSPS. The ADS1286UB/2K5 provides 12-bit resolution with a maximum throughput of 20 kSPS. The ADS1246 therefore offers significantly higher resolution at lower speed, whereas the ADS1286 offers higher speed at lower resolution.
Do the ADS1246IPW and ADS1286UB/2K5 have compatible digital interfaces?
Both devices use a serial interface, but they are not protocol-identical. The ADS1246IPW uses an SPI-compatible interface with dedicated command and data framing, while the ADS1286UB/2K5 uses a simpler serial output interface. Firmware and host controller timing must be revalidated when migrating between the two parts.
Can the ADS1246IPW and ADS1286UB/2K5 be used in the same supply voltage range?
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 ADS1286UB/2K5 operates from a single 5 V supply. Designs migrating between the two must confirm that the system supply and reference levels satisfy the respective device requirements.
Are the ADS1246IPW and ADS1286UB/2K5 pin-to-pin or package compatible?
No. The ADS1246IPW is supplied in a 16-pin TSSOP package, while the ADS1286UB/2K5 is supplied in an 8-pin SOIC package. Pin count, pin functions, and PCB land patterns differ, so a direct drop-in replacement is not possible without a board redesign.
Which device is better suited for high-resolution sensor measurement versus fast data acquisition?
The ADS1246IPW, with its 24-bit delta-sigma architecture and integrated PGA, is better suited to high-resolution, low-frequency sensor measurement such as bridge and thermocouple signal conditioning. The ADS1286UB/2K5, with its 12-bit SAR architecture and 20 kSPS throughput, is better suited to faster, lower-resolution data acquisition tasks.
What input configuration differences should be considered when comparing the ADS1246IPW and ADS1286UB/2K5?
The ADS1246IPW provides a fully differential input with a programmable gain amplifier, supporting small-signal measurement with selectable gain. The ADS1286UB/2K5 provides a pseudo-differential input without an integrated PGA. Input signal conditioning and reference design must be reviewed separately for each device.