Part A
ADS8509IDW
Texas Instruments
- Lifecycle
- Active
- Stock
- 2404 PCS
- Package
- SOIC-20
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8506IDW is a viable functional replacement candidate for the ADS8509IDW in many designs, as both share the same 16-bit SAR architecture, 5 V supply, and 24-pin SOIC footprint. However, the ADS8506 offers a reduced 400 kSPS throughput versus the 250 kSPS of the ADS8509, and the input configuration differs, so designers must validate timing margins and analog front-end compatibility before substituting in production.
Resolution and Architecture
High match
Package and Pinout
High match
Sampling Rate
Validation required
Input Configuration
Validation required
Parts at a glance
Part B
ADS8506IDW
Texas Instruments
- Lifecycle
- Active
- Stock
- 4309 PCS
- Package
- SOIC-28
- 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 | ADS8509IDW | ADS8506IDW | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 12 bit | Resolution determines the smallest measurable signal step; a 16-bit ADC provides 16x finer quantization than a 12-bit ADC, directly affecting measurement accuracy and dynamic range. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Both are single-channel devices, so channel count is not a differentiator, but confirming this ensures the part fits single-input signal chains. |
| Sampling Rate | 250 kSPS | 400 kSPS | Maximum throughput affects how fast the system can digitize signals; the ADS8506 supports higher sample rates, which matters for faster or higher-bandwidth acquisition. |
| Input Type | Single-ended | Single-ended | Input configuration determines how the sensor or signal source connects; both being single-ended means the same front-end topology can be reused. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Supply requirements dictate power rail design; identical 5 V operation allows the same power supply and decoupling to be used. |
| Interface | SPI / serial | SPI / serial | The digital interface must match the host controller; both using SPI serial means firmware and bus wiring can remain largely unchanged. |
| Package | SOIC-28 (DW) | SOIC-28 (DW) | Package and footprint compatibility determine whether a drop-in board replacement is possible; matching SOIC-28 packages support direct substitution. |
| INL (Integral Nonlinearity) | ±1.5 LSB (typ) | ±0.5 LSB (typ) | INL describes deviation from an ideal transfer function; lower INL yields better absolute accuracy, so the 12-bit part's tighter LSB spec can matter for linearity-critical designs. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must cover the application environment; identical industrial ranges mean both suit the same operating conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8509IDW | ADS8506IDW |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 12 |
| Sampling Rate(Per Second) | 250k | 40k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | 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 | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADS8509IDW and ADS8506IDW?
Both are 16-bit successive-approximation register (SAR) analog-to-digital converters from Texas Instruments in a 28-pin SOIC (DW) package. The primary difference is the analog input range and reference configuration: the ADS8509IDW supports a ±10 V bipolar input range with an internal reference, while the ADS8506IDW supports a 0 V to 4.096 V unipolar input range with an internal reference. They also differ in their input configuration and full-scale range specifications, so they are not pin-for-pin functional equivalents despite sharing the same package.
Do the ADS8509IDW and ADS8506IDW share the same package and pinout?
Yes. Both devices are offered in the same 28-pin SOIC (DW) package from Texas Instruments. However, because the analog input ranges and reference configurations differ, designers must verify pin function assignments against the respective datasheets before considering any layout reuse.
What is the resolution and architecture of these ADCs?
Both the ADS8509IDW and ADS8506IDW are 16-bit SAR (successive-approximation register) analog-to-digital converters, providing 16-bit resolution with no missing codes as specified in the Texas Instruments datasheets.
What analog input ranges do the ADS8509IDW and ADS8506IDW support?
The ADS8509IDW supports a bipolar input range of ±10 V. The ADS8506IDW supports a unipolar input range of 0 V to 4.096 V. These differing input ranges are a key selection criterion when choosing between the two parts.
Do both devices include an internal voltage reference?
Yes. Both the ADS8509IDW and ADS8506IDW integrate an internal voltage reference, as documented in their respective Texas Instruments datasheets. The reference value and its relationship to the full-scale input range differ between the two devices, so the datasheet should be consulted for exact reference specifications.
What digital interface do the ADS8509IDW and ADS8506IDW use?
Both devices provide a parallel digital output interface for connecting to host processors or controllers, as specified in the Texas Instruments datasheets. Designers should confirm timing and control signal requirements from the respective datasheet for their specific system.
Can the ADS8509IDW be used as a drop-in replacement for the ADS8506IDW?
No. Although both are 16-bit SAR ADCs in the same 28-pin SOIC package, they differ in analog input range (±10 V bipolar versus 0 V to 4.096 V unipolar) and reference configuration. A direct drop-in substitution is not supported without validating the input signal conditioning, reference, and full-scale requirements against the target design and the respective Texas Instruments datasheets.