Part A
ADS7955QDBTRQ1
Texas Instruments
- Lifecycle
- Active
- Stock
- 7159 Stückzahl
- Package
- TSSOP-30
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7955QDBTRQ1 is a functional replacement candidate for the ADS7952QDBTRQ1, sharing the same package, pinout, resolution, and automotive qualification, with the primary distinction being the reduced channel count of the ADS7955. Designers must confirm that the lower channel count satisfies their system requirements before substituting.
Package Type
High match
Resolution
High match
Channel Count
Validation required
Automotive Qualification
High match
Parts at a glance
Part B
ADS7952QDBTRQ1
Texas Instruments
- Lifecycle
- Active
- Stock
- 6054 Stückzahl
- Package
- TSSOP-38
- Series
- Datenerfassung mit Analog to Digital Converters (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 | ADS7952QDBTRQ1 | ADS7955QDBTRQ1 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 10 bit | Resolution determines the smallest analog voltage change the ADC can distinguish; a 12-bit device provides 4x finer quantization than a 10-bit device, directly affecting measurement accuracy and substitutability. |
| Number of Input Channels | 12 single-ended | 8 single-ended | The channel count defines how many analog signals can be multiplexed into the ADC; a system needing 12 inputs cannot be served by an 8-channel part without external multiplexing. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum throughput determines the highest signal bandwidth that can be digitized; matching rates mean timing budgets remain compatible when swapping parts. |
| Supply Voltage (Analog and Digital) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Compatible supply ranges ensure the device operates within the same power rails, so no regulator or level-shifting changes are required for substitution. |
| Interface Type | SPI (serial) | SPI (serial) | The digital interface must match the host controller; an identical SPI interface allows drop-in replacement without firmware or hardware redesign. |
| Input Type | Single-ended | Single-ended | Single-ended versus differential input architecture affects signal conditioning and noise immunity; matching input types keeps the analog front-end compatible. |
| Package | TSSOP-38 (DBT) | TSSOP-38 (DBT) | An identical package and pinout enables direct board-level replacement without layout changes or rework of the PCB footprint. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The automotive-qualified temperature range must cover the application environment; matching ranges confirm both parts suit the same harsh conditions. |
| Qualification | AEC-Q100 (automotive) | AEC-Q100 (automotive) | Automotive qualification confirms reliability and quality standards for vehicle applications; both parts meeting AEC-Q100 supports use in the same automotive designs. |
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 | ADS7955QDBTRQ1 | ADS7952QDBTRQ1 |
|---|---|---|
| Series | Automotive, AEC-Q100 | Automotive, AEC-Q100 |
| Part Status | Active | Active |
| Number of Bits | 10 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 8 | 12 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-S/H-ADC | MUX-PGA-S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Voltage - Supply, Digital | 1.7V ~ 5.25V | 1.7V ~ 5.25V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the ADS7952QDBTRQ1 and ADS7955QDBTRQ1?
Both are automotive-qualified, 12-bit successive-approximation ADCs from Texas Instruments in a 38-pin TSSOP (DBT) package with a serial SPI interface. The primary difference is channel count and sampling rate: the ADS7952QDBTRQ1 provides 12 single-ended input channels with a maximum throughput of 1 MSPS, while the ADS7955QDBTRQ1 provides 8 single-ended input channels with a maximum throughput of 1 MSPS. Both support a 2.7 V to 5.25 V analog supply range and are AEC-Q100 qualified.
Are the ADS7952QDBTRQ1 and ADS7955QDBTRQ1 pin-compatible?
Both devices are offered in the same 38-pin TSSOP (DBT) package, but they are not functionally interchangeable without design review because the channel count differs (12 vs 8). Pin functions and the multiplexer configuration must be verified against the respective datasheets before any substitution is considered.
What is the resolution and architecture of these ADCs?
Both the ADS7952QDBTRQ1 and ADS7955QDBTRQ1 are 12-bit successive-approximation register (SAR) analog-to-digital converters with an integrated multiplexer, sample-and-hold, and SPI-compatible serial interface.
What is the maximum sampling rate of each device?
The ADS7952QDBTRQ1 supports a maximum throughput of 1 MSPS, and the ADS7955QDBTRQ1 also supports a maximum throughput of 1 MSPS. The sampling rate is identical; the differentiating factor is the number of input channels.
What supply voltage range do these devices support?
Both devices operate from an analog supply (AVDD) of 2.7 V to 5.25 V and a digital supply (DVDD) of 1.7 V to 5.25 V, allowing flexible interfacing with low-voltage logic and 5 V systems.
Are these components AEC-Q100 qualified for automotive applications?
Yes. Both the ADS7952QDBTRQ1 and ADS7955QDBTRQ1 carry the Q1 suffix and are AEC-Q100 qualified, making them suitable for automotive and other harsh-environment applications.
What interface do these ADCs use to communicate with a host controller?
Both devices use a SPI-compatible serial interface for configuration and data readout, supporting daisy-chain operation and multiple device configurations on a shared bus.
Can the ADS7955QDBTRQ1 replace the ADS7952QDBTRQ1 in an existing design?
Not directly. Although both share the same package and 12-bit, 1 MSPS SAR architecture, the ADS7955QDBTRQ1 provides only 8 input channels versus 12 on the ADS7952QDBTRQ1. Any replacement requires verifying channel mapping, multiplexer programming, and PCB routing against the target datasheet.