Part A
ADS7961QDBTRQ1
德州儀器
- Lifecycle
- Active
- Stock
- 1800 件
- Package
- TSSOP-38
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS7961QDBTRQ1 is a functionally comparable alternative to the ADS7953SBDBTR, sharing the same 12-bit SAR architecture, 16-channel multiplexer, and TSSOP-38 footprint, but it is not a true drop-in replacement due to differences in SPI interface mode, automotive qualification, and specified operating temperature range. Designers should validate the interface configuration and qualification requirements before substituting.
Resolution and Architecture
High match
Channel Count and Package
High match
Digital Interface Mode
Validation required
Qualification and Temperature Grade
Not compatible
Parts at a glance
Part B
ADS7953SBDBTR
德州儀器
- Lifecycle
- Active
- Stock
- 6896 件
- Package
- TSSOP-38
- Series
- 資料獲取-模數轉換器（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 | ADS7961QDBTRQ1 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 8 bit | Resolution determines the smallest measurable voltage step; a 12-bit ADC provides 16x finer quantization than an 8-bit ADC, directly affecting measurement accuracy. |
| Number of Input Channels | 16 | 16 | Channel count defines how many analog signals can be multiplexed into a single ADC; matching channel counts supports similar system architectures. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum sample rate limits the bandwidth of signals that can be digitized; identical rates mean comparable throughput capability. |
| Supply Voltage (Analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Analog supply range determines compatibility with system rails and the achievable input voltage span. |
| Interface Type | SPI | SPI | The digital interface must match the host controller; both using SPI allows similar board-level connectivity. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Temperature range indicates suitability for industrial and automotive environments; matching ranges support similar application deployment. |
| Package / Pin Count | TSSOP-38 | TSSOP-38 | Package and pin count affect PCB footprint and layout; identical packages allow drop-in board compatibility. |
| Automotive Qualification | Not AEC-Q100 qualified | AEC-Q100 qualified | AEC-Q100 qualification is required for automotive applications; only the Q1 variant meets automotive reliability standards. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7961QDBTRQ1 | ADS7953SBDBTR |
|---|---|---|
| Series | Automotive, AEC-Q100 | microPOWER™ |
| Part Status | Active | Active |
| Number of Bits | 8 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 16 | 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 ADS7961QDBTRQ1?
The ADS7953SBDBTR is a 12-bit, 16-channel SAR ADC in a TSSOP-38 package, specified for the -40°C to +125°C temperature range. The ADS7961QDBTRQ1 is an 8-bit, 16-channel SAR ADC in a TSSOP-38 package that is AEC-Q100 qualified for automotive applications. The primary differences are resolution (12-bit vs 8-bit) and qualification grade (industrial vs automotive AEC-Q100).
Are the ADS7953SBDBTR and ADS7961QDBTRQ1 pin-to-pin compatible?
Both devices are offered in the same TSSOP-38 (DBT) package, and the ADS7953 and ADS7961 families share a common pinout for the analog inputs, SPI interface, and supply pins. However, designers must verify the full pin function assignment against both datasheets before layout substitution, since the devices differ in resolution and feature set.
What is the resolution and sample rate of each device?
The ADS7953SBDBTR provides 12-bit resolution with a maximum throughput of 1 MSPS. The ADS7961QDBTRQ1 provides 8-bit resolution with a maximum throughput of 1 MSPS. Both use a successive-approximation register (SAR) architecture with an integrated sample-and-hold.
What analog input configuration do these ADCs support?
Both devices provide 16 single-ended input channels. The ADS7953 family also supports selectable single-ended or pseudo-differential input modes, configurable through the SPI command set. The input multiplexer is controlled via the serial interface on both parts.
What is the difference in automotive qualification between the two parts?
The ADS7961QDBTRQ1 carries the Q1 suffix and is AEC-Q100 qualified, making it suitable for automotive applications. The ADS7953SBDBTR is an industrial-grade device and is not AEC-Q100 qualified. Designs requiring automotive qualification should use the Q1-graded part.
What supply voltage and reference requirements apply to these ADCs?
Both devices operate from a single analog supply (AVDD) in the 2.7 V to 5.25 V range, with a separate digital supply (DVDD) in the 1.7 V to 5.25 V range. An external reference voltage is applied to the REF pin to set the full-scale input range; the reference must be within the specified limits given in each datasheet.
What serial interface do these devices use?
Both the ADS7953SBDBTR and ADS7961QDBTRQ1 use a SPI-compatible serial interface for configuration and data readout, supporting daisy-chain operation. The interface includes SCLK, SDI, SDO, and CS signals, allowing connection to standard microcontrollers and DSPs.
Can the ADS7961QDBTRQ1 be used as a drop-in replacement for the ADS7953SBDBTR in an existing design?
Not without design review. Although both are 16-channel, 1 MSPS SAR ADCs in the same TSSOP-38 package, the ADS7961QDBTRQ1 has 8-bit resolution versus 12-bit on the ADS7953SBDBTR, so system accuracy and firmware scaling must be re-evaluated. The automotive qualification of the Q1 part is an added benefit, but resolution loss must be acceptable for the application.