Part A
ADS8588SIPM
Texas Instruments
- Lifecycle
- Active
- Stock
- 5425 PCS
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8588SIPM is a strong functional replacement candidate for the ADS8556IPM, sharing the same 16-bit SAR architecture, 8-channel simultaneous-sampling input structure, and LQFP-64 footprint. Designers should validate the higher aggregate throughput and confirm the digital interface and reference configuration meet the target system requirements before substituting.
Resolution and Architecture
High match
Channel Count and Input Configuration
High match
Package and Pinout
Validation required
Throughput and Interface
Validation required
Parts at a glance
Part B
ADS8556IPM
Texas Instruments
- Lifecycle
- Active
- Stock
- 6944 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 | ADS8556IPM | ADS8588SIPM | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit SAR ADCs, so nominal resolution is equivalent and does not differentiate substitutability. |
| Number of input channels | 6 single-ended (or 3 differential) | 8 single-ended (or 4 differential) | Channel count determines how many signals can be sampled; the ADS8588S offers two additional single-ended inputs, which affects system architecture. |
| Maximum sampling rate | 630 kSPS | 500 kSPS | Throughput per channel affects achievable signal bandwidth and timing margin; the ADS8556IPM samples faster. |
| Input voltage range | ±10 V (bipolar, configurable) | ±10 V (bipolar, configurable) | Both support wide bipolar input ranges, allowing direct interface to industrial-level signals without external conditioning. |
| Supply voltage | 5 V analog (AVDD), 2.7–5.5 V digital (DVDD) | 5 V analog (AVDD), 2.7–5.5 V digital (DVDD) | Compatible supply rails simplify drop-in replacement and power-tree reuse. |
| Interface type | Parallel and serial (SPI-compatible) | Parallel and serial (SPI-compatible) | Matching interface options allow either device to connect to the same host controller without redesign. |
| Package | 64-pin LQFP (PM) | 64-pin LQFP (PM) | Identical package and pin count support PCB footprint compatibility, though pinout must be verified. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +125 °C | Industrial temperature range compatibility ensures both parts suit harsh environments. |
| Internal reference | Yes (internal reference) | Yes (internal reference) | On-chip reference reduces external component count and simplifies precision design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8588SIPM | ADS8556IPM |
|---|---|---|
| Part Status | Active | Active |
| Base Product Number | ADS8588 | - |
| Number of Bits | 16 | 16 |
| Sampling Rate (Per Second) | 200k | - |
| 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 | - |
| 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 |
| Mounting Type | Surface Mount | - |
| Packaging | Tray | - |
| Sampling Rate(Per Second) | - | 630k |
| Number of A/D Converters | - | 1 |
Frequently asked questions
What are the key differences between the ADS8556IPM and ADS8588SIPM?
The ADS8556IPM is a 16-bit, 6-channel simultaneous-sampling SAR ADC with a maximum throughput of 630 kSPS per channel, while the ADS8588SIPM is a 16-bit, 8-channel simultaneous-sampling SAR ADC with a maximum throughput of 500 kSPS per channel. The ADS8556IPM offers higher per-channel speed and two fewer channels, whereas the ADS8588SIPM provides two additional channels at a lower per-channel throughput.
Are the ADS8556IPM and ADS8588SIPM pin-to-pin compatible?
No. Both devices are offered in a 64-pin LQFP package (PM suffix), but they are not pin-to-pin compatible. The ADS8556IPM has 6 analog inputs and the ADS8588SIPM has 8 analog inputs, so the analog input pin assignments and surrounding pin functions differ. A direct drop-in replacement is not possible without PCB redesign and validation against the respective datasheets.
Do both ADCs support simultaneous sampling on all channels?
Yes. Both the ADS8556IPM and ADS8588SIPM use simultaneous-sampling SAR architecture, converting all analog input channels at the same instant. This makes both suitable for multi-phase power monitoring, motor control, and other applications requiring phase-coherent acquisition across channels.
What are the analog input voltage ranges for these two devices?
Both the ADS8556IPM and ADS8588SIPM support software-selectable analog input ranges of ±10 V, ±5 V, and 0 V to 10 V (with the appropriate reference and configuration). The wide bipolar input range allows direct connection to industrial sensors and signals without external level shifting.
How do the throughput and channel count trade off between the two parts?
The ADS8556IPM provides 6 channels at up to 630 kSPS per channel, while the ADS8588SIPM provides 8 channels at up to 500 kSPS per channel. Designs needing more channels should consider the ADS8588SIPM; designs needing higher per-channel sampling rate with fewer channels should consider the ADS8556IPM.
Do both devices use the same digital interface?
Both devices provide a parallel interface and a serial interface for host communication, with dedicated conversion start and busy/ready signaling. Because the channel counts differ, the serial frame length and the parallel data word mapping differ between the ADS8556IPM (6 channels) and ADS8588SIPM (8 channels), so firmware and FPGA/controller interface logic must be adapted accordingly.
Are the ADS8556IPM and ADS8588SIPM specified over the same temperature range?
Both devices are offered in the industrial temperature grade (I suffix) covering −40 °C to +125 °C, as indicated by the IPM suffix on both part numbers. The identical temperature grade supports use in industrial and harsh-environment applications for either device.
Can the ADS8588SIPM replace the ADS8556IPM in an existing design?
Not as a direct drop-in replacement. Although both are 16-bit simultaneous-sampling SAR ADCs in a 64-pin LQFP package with similar input ranges and supply requirements, the differing channel count (8 vs 6), pin assignments, serial frame format, and maximum throughput (500 kSPS vs 630 kSPS) require schematic, layout, and firmware changes. Any substitution must be validated against the official datasheets and the target design requirements.