Part A
ADS8505IBDW
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 6935 個数
- Package
- SOIC-28
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8505IBDW and ADS8507IDWG4 are both 16-bit successive-approximation ADCs offering strong functional overlap, but they differ in analog input range and package footprint, so the ADS8507IDWG4 is a viable functional substitute only after confirming input-range and board-layout compatibility.
Resolution
High match
Interface Type
High match
Analog Input Range
Validation required
Package Type
Validation required
Parts at a glance
Part B
ADS8507IDWG4
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 7666 個数
- Package
- SOIC-28
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | ADS8505IBDW | ADS8507IDWG4 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit SAR ADCs, so resolution is identical and not a differentiator for substitutability. |
| Sampling Rate | 250 kSPS | 400 kSPS | The ADS8507 offers a higher throughput, which matters if the application requires faster conversion cycles. |
| Input Type | Single-ended | Pseudo-differential | Input configuration affects how signals are connected and common-mode rejection; pseudo-differential can improve noise immunity. |
| Number of Input Channels | 1 | 1 | Both are single-channel devices, so channel count does not affect substitutability. |
| Supply Voltage (Analog) | 5 V | 5 V | Identical analog supply requirements mean the same power rail can be reused. |
| Interface | Parallel | SPI / Serial | The digital interface differs significantly; a parallel interface versus a serial interface requires different host connections and firmware. |
| Package / Case | SOIC-28 | SOIC-28 | Same package footprint allows drop-in PCB compatibility without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings ensure equivalent environmental robustness. |
| Reference Type | External | External | Both require an external voltage reference, so reference circuitry can be shared or reused. |
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 | ADS8505IBDW | ADS8507IDWG4 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 250k | 40k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | Parallel | 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 ADS8505IBDW and ADS8507IDWG4?
The ADS8505IBDW is a 16-bit successive-approximation ADC with a parallel interface, while the ADS8507IDWG4 is a 16-bit delta-sigma ADC with a serial SPI-compatible interface. They differ in architecture, digital interface, package, and several AC/DC performance specifications, so they are not drop-in replacements for each other.
Do the ADS8505IBDW and ADS8507IDWG4 use the same package and pinout?
No. The ADS8505IBDW is supplied in a 28-pin SOIC (DW) package, and the ADS8507IDWG4 is supplied in a 24-pin SOIC (DW) package. The pin counts and pin functions differ, so the PCB land patterns and connections are not interchangeable.
What digital interface does each device provide?
The ADS8505IBDW provides a parallel digital output interface for direct connection to a host processor bus. The ADS8507IDWG4 provides a serial interface compatible with SPI and similar synchronous serial ports. System firmware and host port configuration must be matched to the respective interface.
Are the analog input ranges and reference requirements the same?
Both devices support bipolar analog input ranges and use an external voltage reference, but the exact input range configuration and reference voltage requirements should be confirmed against each device's datasheet. The input span and reference drive requirements are not identical, so the analog front-end must be designed for the specific device.
Can the ADS8507IDWG4 directly replace the ADS8505IBDW in an existing design?
No. Because the package, pinout, digital interface, and converter architecture differ, a direct replacement is not possible. Any substitution requires a PCB redesign, firmware changes for the serial interface, and revalidation of analog performance against the system requirements.
How do the sampling architectures affect system design?
The ADS8505IBDW uses successive-approximation conversion, which provides a defined conversion time per sample and is well suited to multiplexed multi-channel acquisition. The ADS8507IDWG4 uses delta-sigma conversion, which typically offers higher resolution and lower noise for lower-bandwidth signals but has different latency and digital filter characteristics. The choice depends on signal bandwidth, channel count, and latency requirements.
What should be verified before selecting between these two ADCs?
Verify the required resolution and accuracy, input signal bandwidth, interface type available on the host, package and board space, reference and supply requirements, and the timing and latency budget. Both are 16-bit converters, but their architecture, interface, and package differences mean the selection must be based on the complete datasheet specifications for each part.