Part A
ADS7955QDBTRQ1
Texas Instruments
- Lifecycle
- Active
- Stock
- 7159 PCS
- Package
- TSSOP-30
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7955QDBTRQ1 is a functionally compatible replacement candidate for the ADS7953SBDBTR in many applications, sharing the same 12-bit SAR architecture, TSSOP-38 footprint, and 1 MSPS throughput. However, the ADS7955QDBTRQ1 provides 8 single-ended input channels versus 16 on the ADS7953SBDBTR, and its automotive-qualified temperature range and supply requirements differ. Designers must validate channel count sufficiency and confirm supply and interface compatibility before substituting.
Resolution and Architecture
High match
Channel Count
Validation required
Package and Footprint
High match
Operating Temperature Range
Validation required
Parts at a glance
Part B
ADS7953SBDBTR
Texas Instruments
- Lifecycle
- Active
- Stock
- 6896 PCS
- Package
- TSSOP-38
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | ADS7953SBDBTR | ADS7955QDBTRQ1 | Why it matters |
|---|---|---|---|
| Number of Input Channels | 16 | 8 | Channel count determines how many analog signals can be multiplexed into the ADC; a 16-channel part cannot be directly substituted where 8 channels are required and vice versa without redesigning the input multiplexing. |
| Resolution | 12 bit | 10 bit | Resolution sets the smallest measurable signal step (LSB size); a 12-bit ADC provides 4x finer quantization than a 10-bit ADC, affecting measurement accuracy and dynamic range. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum throughput determines the highest signal bandwidth that can be digitized; both parts share the same 1 MSPS rate, so timing budgets remain compatible. |
| Supply Voltage (Analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Analog supply range defines compatibility with the system rail and the input signal span; matching ranges allow the same front-end biasing to be reused. |
| Interface Type | SPI (Serial) | SPI (Serial) | The digital interface must match the host controller; both use SPI, so firmware and bus wiring are largely interchangeable. |
| Input Type | Single-ended | Single-ended | Single-ended inputs reference each channel to ground, simplifying sensor interfacing; matching input topology avoids reworking the analog front end. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The temperature range must cover the application environment; identical industrial/automotive ranges mean both parts suit the same thermal conditions. |
| Package | TSSOP-38 | TSSOP-38 | Package footprint and pin count determine PCB layout compatibility; matching packages allow the same land pattern to be used. |
| Qualification | Catalog / Industrial | AEC-Q100 (Automotive) | Automotive qualification indicates enhanced reliability screening; a Q1 part is required for automotive applications, while the catalog part is intended for general industrial use. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7955QDBTRQ1 | ADS7953SBDBTR |
|---|---|---|
| Series | Automotive, AEC-Q100 | microPOWER™ |
| Part Status | Active | Active |
| Number of Bits | 10 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 8 | 16 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-S/H-ADC | MUX-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 | 2.7V ~ 5.25V |
| Features | PGA | - |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the ADS7953SBDBTR and the ADS7955QDBTRQ1?
The ADS7953SBDBTR is a 12-bit, 16-channel, 1-MSPS SAR ADC in a 38-pin TSSOP package, specified for the -40°C to +125°C temperature range. The ADS7955QDBTRQ1 is an automotive-qualified (AEC-Q100 Grade 1) 10-bit, 8-channel, 1-MSPS SAR ADC in a 30-pin TSSOP package. Key differences include resolution (12-bit vs 10-bit), channel count (16 vs 8), package pin count (38 vs 30), and qualification level (industrial vs automotive AEC-Q100).
Are the ADS7953SBDBTR and ADS7955QDBTRQ1 pin-to-pin compatible?
No. The ADS7953SBDBTR uses a 38-pin TSSOP (DBT) package, while the ADS7955QDBTRQ1 uses a 30-pin TSSOP (DBT) package. The different pin counts and pinouts prevent direct pin-to-pin substitution; a PCB redesign would be required.
Do both devices support the same serial interface?
Yes. Both the ADS7953 and ADS7955 families use a SPI-compatible serial interface with a dedicated SCLK, SDI, SDO, and CS pin, supporting daisy-chain and multi-device configurations. However, the command set and channel addressing differ because the ADS7953 has 16 channels and the ADS7955 has 8 channels.
What is the automotive qualification status of each device?
The ADS7955QDBTRQ1 carries the Q1 suffix and is qualified to AEC-Q100 Grade 1, making it suitable for automotive applications. The ADS7953SBDBTR is an industrial-grade device and is not AEC-Q100 qualified; it should not be used in automotive safety-critical applications without additional qualification.
How do the sampling rates and resolution compare?
Both devices offer a maximum throughput of 1 MSPS. The ADS7953SBDBTR provides 12-bit resolution, while the ADS7955QDBTRQ1 provides 10-bit resolution. For applications requiring higher precision, the ADS7953 is preferable; for automotive-qualified 10-bit sensing, the ADS7955QDBTRQ1 is appropriate.
Can the ADS7955QDBTRQ1 replace the ADS7953SBDBTR in an existing design?
Not directly. The ADS7955QDBTRQ1 has fewer channels (8 vs 16), lower resolution (10-bit vs 12-bit), and a different package footprint (30-pin vs 38-pin TSSOP). A replacement would require PCB redesign, firmware updates for channel addressing, and validation of the reduced resolution against system requirements.
What are the operating temperature ranges for these ADCs?
The ADS7953SBDBTR is specified over the industrial temperature range of -40°C to +125°C. The ADS7955QDBTRQ1, as an AEC-Q100 Grade 1 device, is specified over -40°C to +125°C ambient temperature, consistent with automotive Grade 1 requirements.