Part A
ADS8556IPMR
Texas Instruments
- Lifecycle
- Active
- Stock
- 2848 Stückzahl
- Package
- LQFP-64
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8588SIPMR and ADS8556IPMR are both 16-bit, 8-channel simultaneous-sampling SAR ADCs in pin-compatible LQFP-64 packages, making them a strong functional replacement candidate. However, the ADS8588SIPMR offers a higher aggregate throughput (500 kSPS vs 630 kSPS per channel configuration differences) and a wider analog input range, so designers must validate timing, input range, and reference requirements before substituting in existing designs.
Resolution and Channel Count
High match
Package and Pinout
High match
Sampling Rate
Validation required
Analog Input Range
Validation required
Parts at a glance
Part B
ADS8588SIPMR
Texas Instruments
- Lifecycle
- Active
- Stock
- 4137 Stückzahl
- Package
- LQFP-64
- 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 | ADS8588SIPMR | ADS8556IPMR | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit, so nominal precision is equivalent; resolution alone does not differentiate them. |
| Number of ADC channels | 8 single-ended | 6 single-ended / 3 differential | Channel count and input topology determine how many signals can be sampled and whether differential inputs are available. |
| Maximum sampling rate | 500 kSPS | 630 kSPS | Higher throughput allows faster signal acquisition and wider input bandwidth in the application. |
| Input voltage range | ±10 V (bipolar) | ±10 V, ±5 V, 0 to 10 V (selectable) | Selectable ranges provide flexibility to match different sensor and signal amplitudes without external conditioning. |
| Supply voltage | 5 V analog supply | 5 V analog supply, 2.7 V to 5.5 V digital supply | Supply requirements affect power design and logic-level compatibility with the host processor. |
| Interface | Parallel and serial (SPI-compatible) | Parallel and serial (SPI-compatible) | Both offer flexible host interfacing, so interface is not a differentiator between these parts. |
| Package | LQFP-64 | LQFP-64 | Identical package and footprint simplify board-level substitution and layout reuse. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +125 °C | Equivalent temperature ratings mean both suit the same industrial environments. |
| Internal reference | Integrated reference | Integrated reference | Both include an on-chip reference, reducing external component count and simplifying design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8556IPMR | ADS8588SIPMR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 630k | 200k |
| Number of Inputs | 6 | 8 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, Parallel | Parallel, Serial |
| Configuration | S/H-ADC | PGA-ADC |
| Ratio - S / H: ADC | 1:1 | 0:1 |
| Number of A/D Converters | 1 | 8 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 5V | 4.75V ~ 5.25V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 2.3V ~ 5.25V |
| 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 ADS8588SIPMR and ADS8556IPMR?
The ADS8588SIPMR is an 8-channel, 16-bit, simultaneous-sampling SAR ADC with a maximum throughput of 500 kSPS per channel, integrated analog front-end (AFE), and a parallel/serial interface. The ADS8556IPMR is a 6-channel, 16-bit, simultaneous-sampling SAR ADC with a maximum throughput of 630 kSPS per channel, also featuring an integrated AFE. The ADS8588S has two additional input channels, while the ADS8556 offers a higher per-channel sampling rate.
Are the ADS8588SIPMR and ADS8556IPMR pin-to-pin compatible?
No. The ADS8588SIPMR is supplied in a 64-pin LQFP package, while the ADS8556IPMR is supplied in a 64-pin LQFP package as well, but the pin functions and channel assignments differ due to the different channel counts (8 vs 6) and internal signal routing. A direct drop-in replacement is not supported; the PCB layout and pin connections must be redesigned or verified against the respective datasheets.
Can the ADS8588SIPMR and ADS8556IPMR operate from the same analog and digital supply voltages?
Both devices support a 5 V analog supply (AVDD) and a flexible digital supply (DVDD) that can range from 2.7 V to 5.5 V, allowing direct interfacing to 3.3 V or 5 V logic. However, the exact recommended operating ranges and current consumption differ between the two datasheets, so the power supply design should be validated for each part individually.
Which device offers a higher per-channel throughput, and what is the maximum sampling rate?
The ADS8556IPMR offers a higher per-channel throughput. It supports a maximum sampling rate of 630 kSPS per channel, whereas the ADS8588SIPMR supports a maximum of 500 kSPS per channel. Both devices perform simultaneous sampling across all channels.
Do both ADCs support the same digital interface options?
Both devices provide a parallel interface and a serial interface for data readout. The ADS8588SIPMR supports a 16-bit parallel bus and a serial interface with daisy-chain capability. The ADS8556IPMR also supports parallel and serial modes, but the exact timing, frame format, and pin mapping differ. Firmware and FPGA/CPU interface logic must be adapted per the respective datasheet.
How do the input voltage ranges and internal reference compare between the two parts?
Both devices integrate an internal reference and support software-selectable input ranges. The ADS8588SIPMR offers selectable input ranges of ±10 V, ±5 V, and ±2.5 V (with a 5 V analog supply). The ADS8556IPMR offers selectable input ranges of ±10 V, ±5 V, and ±2.5 V as well. The internal reference voltage and its accuracy specifications should be compared directly in the respective datasheets for critical applications.
What are the package and temperature range specifications for these two ADCs?
Both the ADS8588SIPMR and ADS8556IPMR are offered in a 64-pin LQFP package and are specified for the industrial temperature range of –40°C to +125°C (TA). The package outline dimensions are similar but not identical; always confirm the land pattern and thermal pad requirements from the manufacturer datasheet before layout.
Which device is more suitable for applications requiring more analog input channels?
The ADS8588SIPMR is more suitable when more analog input channels are required, as it provides 8 simultaneous-sampling channels versus 6 channels on the ADS8556IPMR. If the application prioritizes higher per-channel sampling rate over channel count, the ADS8556IPMR is the better fit.