Part A
ADS8588SIPM
Техасские инструменты
- Lifecycle
- Active
- Stock
- 5425 ПКС
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8588SIPM and ADS8555SPMR are both 16-bit simultaneous-sampling SAR ADCs from Texas Instruments, but they differ in channel count, package footprint, and input configuration. The ADS8588SIPM offers eight channels in an LQFP-64 package, while the ADS8555SPMR provides six channels in an LQFP-64 package. Both share a comparable parallel/serial interface and 5 V analog supply architecture, making the ADS8555SPMR a viable functional candidate only where two fewer channels are acceptable and the board layout is revalidated for pinout differences.
Channel Count
Validation required
Package Type
Validation required
Resolution
High match
Interface Type
High match
Parts at a glance
Part B
ADS8555SPMR
Техасские инструменты
- Lifecycle
- Active
- Stock
- 2733 ПКС
- Package
- LQFP-64
- Series
- Сбор данных - аналогово-цифровые преобразователи (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 | ADS8588SIPM | ADS8555SPMR | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit, so nominal precision is equivalent for substitutability. |
| Number of ADC channels | 8 | 6 | Channel count determines how many analog inputs can be sampled; the ADS8588SIPM offers two additional channels. |
| Sampling rate (max) | 500 kSPS | 630 kSPS | Maximum throughput affects the highest signal bandwidth the system can digitize. |
| Input type | Single-ended | Single-ended | Input configuration must match the sensor/amplifier front end for direct substitution. |
| Supply voltage (analog) | 5 V | 5 V | Analog supply compatibility ensures the device can drop into the same power rail design. |
| Interface | Parallel / Serial (SPI) | Parallel / Serial (SPI) | Digital interface compatibility determines whether the host processor connection can be reused. |
| Package | LQFP-64 | LQFP-64 | Package footprint and pin layout must match for board-level interchangeability. |
| Operating temperature range | -40 to 125 °C | -40 to 125 °C | Temperature range must cover the target application environment for reliable operation. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8588SIPM | ADS8555SPMR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | - | 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 | - | 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 |
| Base Product Number | ADS8588 | - |
| Sampling Rate (Per Second) | 200k | - |
| Number of A / D Converters | 8 | - |
| Mounting Type | Surface Mount | - |
| Packaging | Tray | - |
Frequently asked questions
What are the key architectural differences between the ADS8588SIPM and ADS8555SPMR?
The ADS8588SIPM is an 8-channel, 16-bit successive-approximation register (SAR) ADC with a maximum throughput of 500 kSPS per channel, featuring integrated analog input clamps and a flexible parallel/serial interface. The ADS8555SPMR is a 6-channel, 16-bit SAR ADC with a maximum throughput of 630 kSPS per channel, offering a selectable parallel or serial interface and an internal reference. The ADS8588SIPM provides two additional input channels, while the ADS8555SPMR offers a higher per-channel sampling rate.
Are the ADS8588SIPM and ADS8555SPMR pin-to-pin or package compatible?
No. The ADS8588SIPM is supplied in a 64-pin LQFP package, whereas the ADS8555SPMR is supplied in a 64-pin LQFP package as well, but the pin functions and channel assignments differ between the two devices. A direct drop-in replacement is not supported; the PCB layout and pin connections must be redesigned or verified against each device's datasheet.
How do the input voltage ranges of the ADS8588SIPM and ADS8555SPMR compare?
The ADS8588SIPM supports software-selectable input ranges of ±10 V, ±5 V, and ±2.5 V (with a 5 V reference), accommodating both bipolar and unipolar signals. The ADS8555SPMR supports a fixed ±10 V bipolar input range with an internal 2.5 V reference or external reference. Designs requiring selectable input ranges should favor the ADS8588SIPM, while fixed ±10 V applications can use the ADS8555SPMR.
Which device offers a higher per-channel sampling rate?
The ADS8555SPMR provides a higher maximum throughput of 630 kSPS per channel, compared with 500 kSPS per channel for the ADS8588SIPM. For applications requiring the highest per-channel sampling rate across six channels, the ADS8555SPMR is the appropriate choice; for eight-channel systems, the ADS8588SIPM provides 500 kSPS per channel.
Do both devices support parallel and serial interfaces?
Yes. Both the ADS8588SIPM and ADS8555SPMR support a flexible parallel interface (byte or word mode) and a serial interface (SPI-compatible), allowing connection to a wide range of host processors and FPGAs. The interface mode is selected via dedicated configuration pins on each device.
How do the reference configurations differ between the ADS8588SIPM and ADS8555SPMR?
The ADS8588SIPM requires an external reference voltage (typically 5 V) for its selectable input ranges and does not include an internal reference. The ADS8555SPMR integrates an internal 2.5 V reference that can be used directly or overridden with an external reference. Systems seeking to minimize external components may prefer the ADS8555SPMR's internal reference, while the ADS8588SIPM offers flexibility with an external reference.
What are the typical power supply requirements for each device?
The ADS8588SIPM operates from a 5 V analog supply (AVDD) and a 2.7 V to 5.25 V digital supply (DVDD), with an additional 5 V supply for the input clamps. The ADS8555SPMR operates from a 5 V analog supply (AVDD) and a 2.7 V to 5.25 V digital supply (DVDD), with an internal reference requiring no additional supply. Both devices are specified for operation over the industrial temperature range of –40 °C to +125 °C.
Which device is better suited for eight-channel simultaneous-sampling applications?
The ADS8588SIPM is better suited for eight-channel applications because it provides eight analog input channels, whereas the ADS8555SPMR provides only six channels. Both devices perform simultaneous sampling across all channels, making the ADS8588SIPM the appropriate choice when eight simultaneous channels are required.