Part A
ADS8588SIPMR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 4137 PCS
- Package
- LQFP-64
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8588SIPMR is a viable functional replacement candidate for the ADS8556IPM in many precision multi-channel acquisition designs, offering a faster integrated ADC with comparable resolution and a similar TQFP-64 footprint. However, engineers must validate the reduced analog supply range, the differing digital I/O supply requirements, and the absence of an internal reference buffer before committing to a drop-in substitution.
Resolution and Channel Count
Validation required
Analog Supply Range
Validation required
Package and Pin Configuration
Validation required
Digital Interface and I/O Supply
Validation required
Parts at a glance
Part B
ADS8556IPM
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 6944 PCS
- Package
- LQFP-64
- Series
- Data Acquisition - 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 | ADS8556IPM | ADS8588SIPMR | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit SAR ADCs, so nominal resolution is equivalent for substitutability. |
| Number of input channels | 6 (single-ended) | 8 (single-ended) | Channel count determines how many signals can be sampled; the ADS8588S offers two additional channels. |
| Maximum sampling rate | 630 kSPS | 500 kSPS | Sampling rate affects achievable signal bandwidth and timing margin in the application. |
| Input configuration | Single-ended (6 channels) | Single-ended (8 channels) | Input topology must match the sensor/interface; both are single-ended but differ in channel count. |
| Supply voltage (analog) | 5 V (AVDD) | 5 V (AVDD) | Analog supply compatibility ensures the device can be powered from the same rail in a redesign. |
| Digital interface | Parallel / Serial (SPI-compatible) | Parallel / Serial (SPI-compatible) | Interface compatibility determines whether the host processor connection can be reused. |
| Package | LQFP-64 | LQFP-64 | Package footprint and pinout compatibility are critical for drop-in replacement on an existing PCB. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +125 °C | Temperature range affects suitability for industrial or harsh-environment applications. |
| INL (Integral Nonlinearity) | ±1.5 LSB (typ) | ±1.0 LSB (typ) | INL indicates DC accuracy; a lower value gives better absolute measurement precision. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8588SIPMR | ADS8556IPM |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 200k | 630k |
| Number of Inputs | 8 | 6 |
| Input Type | Single Ended | Single Ended |
| Data Interface | Parallel, Serial | SPI, Parallel |
| Configuration | PGA-ADC | S/H-ADC |
| Ratio - S / H: ADC | 0:1 | 1:1 |
| Number of A/D Converters | 8 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 4.75V ~ 5.25V | 5V |
| Voltage - Supply, Digital | 2.3V ~ 5.25V | 2.7V ~ 3.6V, 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 ADS8556IPM and ADS8588SIPMR?
The ADS8556IPM is a 6-channel, 16-bit successive-approximation register (SAR) ADC with a maximum throughput of 630 kSPS per channel in six-channel mode, featuring true bipolar input ranges of ±4 V, ±8 V, and ±10 V. The ADS8588SIPMR is an 8-channel, 16-bit SAR ADC with a maximum throughput of 500 kSPS per channel, offering software-selectable input ranges of ±10 V, ±5 V, and ±2.5 V. The ADS8588SIPMR integrates an on-chip 8-channel analog front-end with programmable gain, while the ADS8556IPM provides six simultaneously sampled input channels with a fixed set of bipolar ranges.
Are the ADS8556IPM and ADS8588SIPMR pin-to-pin or package compatible?
No. The ADS8556IPM is supplied in a 64-pin LQFP package, while the ADS8588SIPMR is supplied in a 64-pin LQFP package as well, but the pin functions and internal signal assignments differ between the two devices. The ADS8588SIPMR includes additional digital interface and control pins associated with its 8-channel front-end and parallel/serial configuration, so the two devices are not direct drop-in replacements and require separate PCB layouts.
How do the input voltage ranges of the ADS8556IPM and ADS8588SIPMR compare?
The ADS8556IPM supports true bipolar input ranges of ±4 V, ±8 V, and ±10 V, selectable via the range control pins. The ADS8588SIPMR supports software-selectable bipolar input ranges of ±10 V, ±5 V, and ±2.5 V. Both devices accept bipolar signals, but the ADS8556IPM offers a wider ±10 V full-scale option with a different set of selectable ranges than the ADS8588SIPMR.
What are the maximum sampling rates of the ADS8556IPM and ADS8588SIPMR?
The ADS8556IPM achieves a maximum throughput of 630 kSPS per channel when operating in six-channel mode, and 450 kSPS per channel in three-channel mode. The ADS8588SIPMR achieves a maximum throughput of 500 kSPS per channel across all eight channels. The ADS8556IPM therefore offers a higher per-channel sampling rate, while the ADS8588SIPMR provides two additional input channels.
Do the ADS8556IPM and ADS8588SIPMR support both parallel and serial interfaces?
Yes. Both the ADS8556IPM and ADS8588SIPMR support parallel and serial digital interfaces. The ADS8556IPM provides a parallel interface with 16-bit or 8-bit bus options and a serial interface compatible with SPI. The ADS8588SIPMR provides a parallel interface and a serial interface, with the interface mode selected via dedicated configuration pins. Designers should consult the respective datasheets for the exact timing and pin configuration of each mode.
How do the power supply requirements of the ADS8556IPM and ADS8588SIPMR differ?
The ADS8556IPM operates from an analog supply of 5 V and a digital supply of 2.7 V to 5.5 V, and requires an external reference voltage. The ADS8588SIPMR operates from a single 5 V analog supply and a 2.7 V to 5.5 V digital supply, and integrates an internal reference. Both devices require careful decoupling and layout of the analog and digital supplies, but the ADS8588SIPMR reduces external component count by including an on-chip reference.
Which device is better suited for applications requiring more input channels?
The ADS8588SIPMR is better suited for applications requiring more input channels, as it provides eight simultaneously sampled input channels compared with six channels on the ADS8556IPM. The ADS8588SIPMR also integrates an on-chip analog front-end and internal reference, which can simplify system design in multi-channel data acquisition systems. The ADS8556IPM remains preferable where a higher per-channel sampling rate of up to 630 kSPS is required.
Can the ADS8556IPM and ADS8588SIPMR be used interchangeably in an existing design?
No. Although both are 16-bit SAR ADCs in 64-pin LQFP packages, they differ in channel count, input range options, maximum sampling rate, reference architecture, and pin functions. The ADS8556IPM has six channels with ±4 V, ±8 V, and ±10 V ranges and an external reference, while the ADS8588SIPMR has eight channels with ±10 V, ±5 V, and ±2.5 V ranges and an internal reference. A direct substitution would require verification of pin assignments, timing, input range, and reference configuration against the manufacturer datasheets.