Part A
ADS8363SRHBR
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 3921 個数
- Package
- VQFN-32
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Not a drop-in replacement
The ADS8363SRHBR and ADS8329IBRSATG4 are not drop-in replacements for one another. The ADS8363SRHBR is a dual, simultaneous-sampling 16-bit SAR ADC with six fully differential inputs and a parallel interface, while the ADS8329IBRSATG4 is a single-channel 16-bit SAR ADC with a serial SPI interface in a smaller package. Their channel architecture, digital interface, package footprint, and sampling topology differ fundamentally, so a direct board-level substitution is not feasible without redesign.
Different channel architecture
Different digital interface
Different package footprint
Different sampling topology
Parts at a glance
Part B
ADS8329IBRSATG4
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 9953 個数
- Package
- VQFN-16
- 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 | ADS8363SRHBR | ADS8329IBRSATG4 | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 4 (2 differential / 4 single-ended) | 1 (single-ended) | Determines how many independent analog signals can be sampled; a 4-channel device cannot be directly substituted where a single-channel part is used and vice versa. |
| Resolution | 16 bit | 16 bit | Both provide 16-bit resolution, so quantization accuracy is comparable, but resolution alone does not guarantee interchangeability. |
| Sampling Rate (Max) | 1 MSPS | 1 MSPS | Maximum throughput affects the highest signal bandwidth that can be captured; matching rates support similar dynamic performance requirements. |
| Input Type | Differential / Single-ended | Single-ended | Differential inputs improve noise immunity and common-mode rejection; a single-ended-only part cannot replicate differential signal chains. |
| Supply Voltage | 2.7 V to 5.5 V (analog and digital) | 2.7 V to 5.5 V | Compatible supply ranges allow operation from the same rails, simplifying power architecture when evaluating substitution. |
| Interface | SPI / Serial | SPI / Serial | A matching serial interface reduces firmware and host-controller changes, though protocol timing details must still be verified. |
| Package | VQFN-32 (5x5 mm) | VSSOP-8 | Different footprints require PCB redesign; package size also affects thermal and layout considerations. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | The wider temperature range of the ADS8363 supports harsher environments; the ADS8329 is limited to standard industrial conditions. |
| Reference Type | External | External | Both require an external voltage reference, so reference design and accuracy budgeting remain similar across the two parts. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8363SRHBR | ADS8329IBRSATG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 4, 8 | 1 |
| Input Type | Differential, Pseudo-Differential | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 2 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | 5V |
| Voltage - Supply, Digital | 2.3V ~ 3.6V, 5V | 1.65V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
| Features | Simultaneous Sampling | - |
Frequently asked questions
What are the key architectural differences between the ADS8363SRHBR and the ADS8329IBRSATG4?
The ADS8363SRHBR is a dual, 16-bit, 4-channel, simultaneous-sampling successive-approximation register (SAR) analog-to-digital converter (ADC) with a maximum throughput of 1 MSPS per channel, housed in a 40-pin VQFN (RHB) package. The ADS8329IBRSATG4 is a single, 16-bit, 1-channel SAR ADC with a maximum throughput of 1 MSPS, housed in a 16-pin VQFN (RSA) package. The ADS8363 provides two ADCs that sample simultaneously, while the ADS8329 provides a single ADC channel.
Are the ADS8363SRHBR and ADS8329IBRSATG4 pin-to-pin or package compatible?
No. The ADS8363SRHBR uses a 40-pin VQFN (RHB) package, while the ADS8329IBRSATG4 uses a 16-pin VQFN (RSA) package. The pin counts, package body sizes, and pin functions differ, so they are not drop-in replacements and require different PCB land patterns.
What are the input channel configurations of each device?
The ADS8363SRHBR provides four analog input channels organized as two pairs, with two simultaneous-sampling 16-bit ADCs, supporting fully differential or pseudo-differential input configurations. The ADS8329IBRSATG4 provides a single analog input channel with a 16-bit SAR architecture, supporting unipolar or bipolar input ranges depending on configuration.
How do the maximum sampling rates compare between the two ADCs?
Both devices specify a maximum throughput of 1 MSPS. The ADS8363SRHBR achieves 1 MSPS per channel across its two simultaneous-sampling ADCs, while the ADS8329IBRSATG4 achieves 1 MSPS on its single channel. The ADS8363 therefore delivers higher aggregate throughput when both ADCs are used.
What digital interfaces do the ADS8363SRHBR and ADS8329IBRSATG4 support?
The ADS8363SRHBR provides a serial SPI-compatible interface with separate data outputs for its two ADCs, supporting daisy-chain and parallel readback configurations. The ADS8329IBRSATG4 provides a serial SPI-compatible interface for its single channel. Both devices are configured and read over a serial interface, but the ADS8363 requires handling two data streams.
Which device is better suited for simultaneous multi-channel acquisition?
The ADS8363SRHBR is better suited for simultaneous multi-channel acquisition because it integrates two 16-bit ADCs that sample two channel pairs at the same instant, preserving phase relationships between channels. The ADS8329IBRSATG4 has a single ADC channel and cannot sample multiple channels simultaneously without external multiplexing and sequential conversion.
Do the ADS8363SRHBR and ADS8329IBRSATG4 share the same supply voltage requirements?
Both devices operate from a 5 V analog supply and a separate digital supply in the 2.7 V to 5.5 V range, consistent with their respective datasheets. However, because the ADS8363SRHBR integrates two ADCs and additional channel logic, its total power consumption is higher than that of the single-channel ADS8329IBRSATG4. Designers should verify exact supply and current specifications against the latest manufacturer datasheets.
Can the ADS8329IBRSATG4 be used as a substitute for the ADS8363SRHBR in an existing design?
No, not as a direct substitute. The ADS8329IBRSATG4 has a single channel versus the ADS8363SRHBR's four channels, a different package and pinout, and no simultaneous-sampling capability. Substitution would require redesign of the analog front end, PCB layout, and firmware to accommodate the reduced channel count and different interface timing.