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 ADS7952SBDBTG4 is a viable functional replacement candidate for the ADS7961QDBTRQ1 in many designs, as both are 12-bit SAR ADCs with an SPI-compatible serial interface and similar TSSOP-38 footprints. However, the ADS7961QDBTRQ1 offers 16 single-ended channels versus 12 on the ADS7952SBDBTG4, and the ADS7952SBDBTG4 provides a 2-channel simultaneous-sampling capability that the ADS7961QDBTRQ1 does not. Engineers should validate channel count requirements, input configuration, and automotive qualification needs before substituting.
Channel Count
Validation required
Resolution
High match
Interface Type
High match
Input Configuration
Validation required
Parts at a glance
Part B
ADS7952SBDBTG4
德州儀器
- Lifecycle
- Active
- Stock
- 3680 件
- Package
- TFSOP-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 | ADS7961QDBTRQ1 | ADS7952SBDBTG4 | Why it matters |
|---|---|---|---|
| Resolution | 8 bit | 12 bit | Resolution determines the smallest measurable voltage step; a 12-bit ADC provides 16x finer quantization than an 8-bit device, directly affecting measurement accuracy. |
| Number of Input Channels | 16 | 12 | Channel count defines how many analog signals can be multiplexed into the ADC; a mismatch changes system architecture and PCB routing requirements. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum throughput affects how fast the system can acquire signals; 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 determines compatibility with the system rail; identical ranges allow the same power design to be reused. |
| Interface Type | SPI (Serial) | SPI (Serial) | The digital interface must match the host controller; both use SPI, so firmware and bus topology can be shared. |
| Input Type | Single-ended | Single-ended | Single-ended inputs simplify signal conditioning and grounding; matching input topology preserves the analog front-end design. |
| Package / Case | TSSOP-38 (DBT) | TSSOP-38 (DBT) | Package footprint and pinout must match for drop-in substitution; identical TSSOP-38 packages allow the same land pattern. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Temperature range defines environmental robustness; matching ratings ensure the part meets the same qualification requirements. |
| Automotive Qualification | AEC-Q100 qualified | Not AEC-Q100 qualified | AEC-Q100 qualification is mandatory for automotive applications; substituting a non-qualified part may violate reliability and compliance requirements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7961QDBTRQ1 | ADS7952SBDBTG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Series | Automotive, AEC-Q100 | microPOWER™ |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 8 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 16 | 12 |
| 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 | 1.7V ~ 5.25V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Features | PGA | - |
Frequently asked questions
What are the key differences between the ADS7961QDBTRQ1 and the ADS7952SBDBTG4?
The ADS7961QDBTRQ1 is an automotive-qualified (AEC-Q100 Grade 1) 8-channel, 8-bit SAR ADC with a SPI interface, specified over a -40°C to +125°C temperature range. The ADS7952SBDBTG4 is a 12-channel, 12-bit SAR ADC with SPI interface, specified over a -40°C to +125°C temperature range but not automotive-qualified. The two devices differ in resolution (8-bit vs 12-bit), channel count (8 vs 12), and qualification level.
Are the ADS7961QDBTRQ1 and ADS7952SBDBTG4 pin-compatible?
No. The ADS7961QDBTRQ1 is offered in a 30-pin TSSOP (DBT) package, while the ADS7952SBDBTG4 is offered in a 38-pin TSSOP (DBT) package. The different pin counts and pin functions mean they are not drop-in replacements and require different PCB footprints.
What is the resolution and channel count of each device?
The ADS7961QDBTRQ1 provides 8-bit resolution with 8 single-ended input channels. The ADS7952SBDBTG4 provides 12-bit resolution with 12 single-ended input channels. The higher resolution and channel count of the ADS7952SBDBTG4 suit applications requiring finer measurement precision and more sensor inputs.
Do both devices support the same serial interface?
Yes. Both the ADS7961QDBTRQ1 and ADS7952SBDBTG4 use a SPI-compatible serial interface for communication with a host controller. However, the command set and data frame format differ because of the different resolution and channel configurations, so firmware must be adapted accordingly.
What are the supply voltage requirements for these ADCs?
Both devices operate from a single analog supply (AVDD) in the 2.7 V to 5.5 V range and a digital supply (DVDD) in the 1.7 V to 5.5 V range, consistent with the ADS79xx family datasheet specifications. The wide supply range allows operation from 3.3 V or 5 V systems.
Is the ADS7961QDBTRQ1 automotive-qualified while the ADS7952SBDBTG4 is not?
Yes. The ADS7961QDBTRQ1 carries the Q1 suffix indicating AEC-Q100 qualification for automotive applications. The ADS7952SBDBTG4 does not carry automotive qualification and is intended for industrial and general-purpose applications. Designers requiring automotive qualification should select the Q1 variant.
What sampling rate do these ADCs support?
Both devices are part of the ADS79xx family and support a maximum throughput of 1 MSPS (1 megasample per second) with a 20 MHz SPI clock, per the manufacturer datasheet. Actual achievable throughput depends on the serial clock frequency and the number of channels being scanned.
Can the ADS7952SBDBTG4 be used as a replacement for the ADS7961QDBTRQ1 in an existing design?
Not directly. The devices differ in package pin count (38 vs 30 pins), resolution (12-bit vs 8-bit), and channel count (12 vs 8), and the ADS7952SBDBTG4 lacks automotive qualification. A replacement would require PCB redesign, firmware changes, and revalidation against the target application's requirements.