Part A
ADS8556IPMR
Texas Instruments
- Lifecycle
- Active
- Stock
- 2848 PCS
- Package
- LQFP-64
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8556IPMR and ADS8548SPMR are both 16-bit, 8-channel simultaneous-sampling SAR ADCs from Texas Instruments in the same TQFP-64 package, making them strong functional replacement candidates. However, they differ in maximum sampling rate, analog supply range, and interface configuration, so the replacement must be validated against the target system's timing, supply, and digital interface requirements before adoption.
Resolution and Channel Count
High match
Maximum Sampling Rate
Validation required
Analog Supply Range
Validation required
Package Type
High match
Parts at a glance
Part B
ADS8548SPMR
National Semiconductor
- Lifecycle
- Active
- Stock
- 6339 PCS
- Package
- LQFP-64
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | ADS8556IPMR | ADS8548SPMR | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 14 bit | Higher resolution provides finer quantization and better dynamic range; a 16-bit ADC offers 4x the code density of a 14-bit device, affecting measurement precision. |
| Number of Input Channels | 6 (single-ended) / 3 (differential) | 8 (single-ended) / 4 (differential) | Channel count determines how many signals can be sampled; the ADS8548 offers two additional single-ended inputs, which may be required for multi-sensor systems. |
| Sampling Rate (Max) | 630 kSPS | 500 kSPS | Maximum throughput limits the bandwidth of signals that can be digitized; a higher rate supports faster control loops and wider signal bandwidth. |
| Input Configuration | Pseudo-differential / single-ended | Pseudo-differential / single-ended | Input topology affects how signals are referenced and noise rejection; both support similar configurations but channel mapping differs. |
| Supply Voltage (Analog) | 5 V (4.5 V to 5.5 V) | 5 V (4.5 V to 5.5 V) | Analog supply range determines compatibility with system rails and input signal swing; identical ranges ease drop-in evaluation. |
| Interface Type | Parallel / Serial (SPI) | Parallel / Serial (SPI) | Interface compatibility determines whether the ADC can connect to the host processor without glue logic; both offer parallel and serial options. |
| Package | 64-pin LQFP (PM) | 64-pin LQFP (PM) | Package footprint and pinout affect PCB layout and thermal performance; identical packages simplify board redesign. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Industrial temperature range ensures reliable operation in harsh environments; matching ranges support the same application conditions. |
| Power Consumption (Typical) | Approx. 250 mW at 5 V | Approx. 210 mW at 5 V | Power dissipation impacts thermal design and energy budget; lower consumption can be advantageous in dense or thermally constrained systems. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8556IPMR | ADS8548SPMR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Active |
| Number of Bits | 16 | 14 |
| Sampling Rate(Per Second) | 630k | 600k |
| Number of Inputs | 6 | 8 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, Parallel | SPI, Parallel |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 2.7V ~ 5.5V |
| Features | Simultaneous Sampling | Simultaneous Sampling |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
Frequently asked questions
What are the key architectural differences between the ADS8556IPMR and ADS8548SPMR?
The ADS8556IPMR is a 16-bit, 6-channel simultaneous-sampling SAR ADC with a maximum throughput of 630 kSPS per channel, while the ADS8548SPMR is a 14-bit, 8-channel simultaneous-sampling SAR ADC with a maximum throughput of 500 kSPS per channel. Both integrate a bipolar input range and an internal reference, but they differ in resolution, channel count, and sampling rate.
Are the ADS8556IPMR and ADS8548SPMR pin-to-pin compatible?
No. The ADS8556IPMR is offered in a 64-pin TQFP package, whereas the ADS8548SPMR is offered in a 64-pin LQFP package. Although both are 64-pin packages, the pin assignments and package outlines differ, so they are not direct drop-in replacements and require separate PCB land patterns.
What is the input voltage range of each device?
Both the ADS8556IPMR and ADS8548SPMR support bipolar analog input ranges of ±10 V, ±5 V, and ±2.5 V, configurable via the internal reference and input range settings. This makes both devices suitable for industrial signal acquisition where bipolar inputs are required.
How do the throughput and resolution trade off between the two parts?
The ADS8556IPMR provides 16-bit resolution at up to 630 kSPS per channel across 6 channels, while the ADS8548SPMR provides 14-bit resolution at up to 500 kSPS per channel across 8 channels. Designs requiring higher precision and fewer channels favor the ADS8556IPMR, whereas designs needing more simultaneous channels at moderate resolution favor the ADS8548SPMR.
Do both devices support the same digital interface?
Both devices provide a parallel interface and a serial interface for data readout, and both support daisy-chain operation. The exact timing and configuration registers differ between the two datasheets, so firmware and FPGA/controller timing must be validated against the specific device datasheet before reuse.
What are the typical applications for each device?
The ADS8556IPMR is typically used in precision industrial measurement, power quality monitoring, and multi-axis motor control where 16-bit accuracy is needed. The ADS8548SPMR is typically used in applications requiring eight simultaneous channels, such as multi-phase power monitoring and industrial data acquisition systems where 14-bit resolution is sufficient.
Can the ADS8548SPMR directly replace the ADS8556IPMR in an existing design?
No. Because the two devices differ in resolution (16-bit vs 14-bit), channel count (6 vs 8), maximum throughput (630 kSPS vs 500 kSPS), and package/pinout (TQFP vs LQFP), a direct replacement is not possible without redesigning the PCB, updating firmware, and revalidating system performance against the target specifications.