Part A
ADS1243IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 2763 Stückzahl
- Package
- TSSOP-20
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1263IPW and ADS1243IPWR are not drop-in replacements for each other. They differ in ADC architecture and resolution, channel count, package and pinout, and digital interface, so a direct board-level substitution is not possible without redesign and firmware changes.
Different ADC architecture
Different channel count
Different package and pinout
Different digital interface
Parts at a glance
Part B
ADS1263IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 4618 Stückzahl
- Package
- TSSOP-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 | ADS1263IPW | ADS1243IPWR | Why it matters |
|---|---|---|---|
| Resolution (bits) | 32 | 24 | Higher resolution enables finer measurement of small signal changes, which is critical for precision sensor and low-level signal applications. |
| Number of ADC channels | 10 (5 differential / 10 single-ended) | 8 (4 differential / 8 single-ended) | More input channels allow monitoring of additional sensors or signals without adding external multiplexers. |
| Maximum sample rate | 38.4 kSPS | 15 SPS | A higher sample rate supports faster-changing signals and higher-throughput data acquisition systems. |
| Integrated PGA gain range | 1 to 32 V/V | 1 to 128 V/V | The PGA gain range determines the smallest input signal that can be amplified to full scale, affecting sensitivity to low-level sensors. |
| Integrated features | PGA, 2 IDACs, 2 excitation current sources, internal oscillator, reference monitor, sensor bias, AC excitation | PGA, 2 IDACs, internal oscillator, sensor bias | On-chip features reduce external component count and board space; differences affect system architecture and BOM. |
| Supply voltage (analog) | 4.75 V to 5.25 V (AVDD), 2.7 V to 5.25 V (DVDD) | 2.7 V to 5.25 V (AVDD and DVDD) | Supply voltage compatibility determines whether the part can drop into an existing power rail design without modification. |
| Interface | SPI (up to 8 MHz) | SPI (up to 2 MHz) | SPI clock speed affects maximum data throughput and compatibility with the host microcontroller's timing. |
| Package | 28-pin TSSOP (PW) | 28-pin TSSOP (PW), tape and reel | Package and pinout compatibility are essential for physical board layout and drop-in replacement. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +85 °C | A wider temperature range supports use in harsh or industrial environments where the narrower-range part may not be rated. |
| Input noise (RMS, at low data rate) | Approx. 0.15 µV RMS (at 2.5 SPS, gain 32) | Approx. 0.3 µV RMS (at 15 SPS, gain 128) | Lower input noise improves effective resolution and measurement stability for low-level signals. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1243IPWR | ADS1263IPW |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 32 |
| Sampling Rate(Per Second) | 15 | 38k |
| Number of Inputs | 8 | 5, 10 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | MUX-PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External, Internal |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Features | PGA | PGA, Temperature Sensor |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
Frequently asked questions
What are the primary differences between the ADS1263IPW and ADS1243IPWR?
The ADS1263IPW is a 32-bit, 38-kSPS delta-sigma ADC with an integrated PGA, dual excitation current sources, and a 24-bit auxiliary ADC, housed in a 28-pin TSSOP. The ADS1243IPWR is a 24-bit, 15-SPS delta-sigma ADC with a PGA and single excitation current source, housed in a 28-pin TSSOP. The ADS1263 offers higher resolution, faster data rates, and an auxiliary ADC, while the ADS1243 is a lower-speed, lower-power device.
Are the ADS1263IPW and ADS1243IPWR pin-compatible?
No. Although both are 28-pin TSSOP devices, their pin functions and internal architectures differ. The ADS1263IPW includes additional features such as a second ADC and multiple excitation current sources that require different pin assignments. A direct drop-in replacement is not possible without PCB redesign and firmware changes.
What are the maximum data rates of the ADS1263IPW and ADS1243IPWR?
The ADS1263IPW supports data rates up to 38,400 SPS in its main ADC. The ADS1243IPWR supports data rates up to 15 SPS. The ADS1263 is therefore suitable for higher-speed measurement applications, while the ADS1243 targets low-speed, high-resolution sensing.
How do the PGA gain ranges compare between the two devices?
The ADS1263IPW integrates a PGA with selectable gains of 1, 2, 4, 8, 16, and 32. The ADS1243IPWR integrates a PGA with selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128. The ADS1243 provides a wider gain range, which can be advantageous for very low-level signal amplification.
Do both devices include excitation current sources for sensor excitation?
Yes, but with different configurations. The ADS1263IPW provides two matched programmable excitation current sources (50 µA to 2.5 mA) plus a third source for the auxiliary ADC. The ADS1243IPWR provides a single programmable excitation current source (50 µA to 1.5 mA). The ADS1263 supports more complex sensor excitation schemes such as ratiometric RTD measurements with multiple sensors.
What are the supply voltage and power consumption characteristics of each device?
The ADS1263IPW operates from an analog supply of 5 V (4.75 V to 5.25 V) and a digital supply of 2.7 V to 5.25 V, with typical power consumption of approximately 25 mW in full operation. The ADS1243IPWR operates from a single 2.7 V to 5.25 V supply and typically consumes about 1 mW. The ADS1243 is significantly lower power, making it better suited for battery-powered or portable applications.
Which device is more suitable for precision weigh-scale or bridge sensor applications?
Both devices are used in bridge sensor applications, but the choice depends on requirements. The ADS1263IPW offers higher resolution (32-bit), faster data rates, and dual excitation sources, making it suitable for high-precision, multi-sensor weigh scales. The ADS1243IPWR offers 24-bit resolution, lower power, and a wider PGA gain range, making it suitable for low-power, single-sensor bridge measurements where high speed is not required.
Can the ADS1243IPWR be used as a replacement for the ADS1263IPW in an existing design?
No, not as a direct replacement. The devices differ in pinout, resolution, data rate, PGA gain range, excitation current source count, and power consumption. Replacing the ADS1263IPW with the ADS1243IPWR would require PCB redesign, firmware modification, and revalidation of the measurement system against the application requirements.