Part A
ADS7955QDBTRQ1
Texas Instruments
- Lifecycle
- Active
- Stock
- 7159 PCS
- Package
- TSSOP-30
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7955QDBTRQ1 is a functional replacement candidate for the ADS7950QDBTRQ1, sharing the same package, pinout, resolution, and automotive qualification, with the primary distinction being channel count. Designers must confirm that the reduced channel count of the ADS7955 satisfies system requirements before substituting.
Package Type
High match
Resolution
High match
Channel Count
Not compatible
Automotive Qualification
High match
Parts at a glance
Part B
ADS7950QDBTRQ1
Texas Instruments
- Lifecycle
- Active
- Stock
- 6130 PCS
- Package
- TSSOP-30
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | ADS7950QDBTRQ1 | ADS7955QDBTRQ1 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 10 bit | Resolution determines the smallest measurable voltage step; a 12-bit ADC provides 4x finer quantization than a 10-bit ADC, affecting measurement accuracy and dynamic range. |
| Number of Input Channels | 4 single-ended | 8 single-ended | Channel count determines how many analog signals can be monitored; the 8-channel device supports twice as many inputs, which affects system architecture and multiplexing needs. |
| Supply Voltage (Analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Analog supply range must match the system's available rails and signal swing; identical ranges mean both parts are interchangeable from a power-rail perspective. |
| Interface Type | SPI (Serial) | SPI (Serial) | The digital interface must be compatible with the host controller; both using SPI means the same firmware and bus topology can be reused. |
| Package / Mounting | TSSOP-30 (Surface Mount) | TSSOP-30 (Surface Mount) | Package and footprint compatibility allows drop-in replacement on an existing PCB without layout changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The temperature range must cover the application's environment; identical automotive-grade ranges confirm both meet the same environmental qualification. |
| Qualification | AEC-Q100 (Automotive) | AEC-Q100 (Automotive) | Automotive qualification indicates reliability screening for harsh environments; both being AEC-Q100 means equivalent qualification level for automotive use. |
| Input Type | Single-ended | Single-ended | Input configuration affects how signals are connected and common-mode handling; matching single-ended inputs means the same sensor wiring approach applies. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7955QDBTRQ1 | ADS7950QDBTRQ1 |
|---|---|---|
| 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 | 4 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-S/H-ADC | MUX-PGA-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 ADS7950QDBTRQ1 and ADS7955QDBTRQ1?
Both are automotive-qualified, 12-bit successive-approximation ADCs from Texas Instruments in a 30-pin TSSOP (DBT) package with a serial SPI interface. The primary difference is channel count and input configuration: the ADS7950QDBTRQ1 provides 4 single-ended channels (4:1 multiplexer), while the ADS7955QDBTRQ1 provides 8 single-ended channels (8:1 multiplexer). Both support a 2.7 V to 5.25 V analog supply and are AEC-Q100 qualified.
Are the ADS7950QDBTRQ1 and ADS7955QDBTRQ1 pin-compatible?
No. Although both use the same 30-pin TSSOP (DBT) package, the ADS7950QDBTRQ1 is a 4-channel device and the ADS7955QDBTRQ1 is an 8-channel device, so the analog input pin assignments differ. A direct drop-in substitution is not possible without verifying pin functions and PCB routing against the respective datasheets.
Do both devices share the same resolution and sampling rate?
Yes. Both the ADS7950QDBTRQ1 and ADS7955QDBTRQ1 are 12-bit SAR ADCs with a maximum throughput of 1 MSPS, allowing them to be compared directly on resolution and speed when selecting between the 4-channel and 8-channel variants.
What is the analog input voltage range for these ADCs?
Both devices operate from a single analog supply of 2.7 V to 5.25 V and feature a software-programmable input range of 0 V to VREF or 0 V to 2×VREF, where VREF is the external reference voltage. The input range selection is configured through the device's SPI command set.
Are both parts AEC-Q100 qualified for automotive applications?
Yes. Both the ADS7950QDBTRQ1 and ADS7955QDBTRQ1 carry the Q1 automotive suffix and are AEC-Q100 qualified, making them suitable for automotive and other harsh-environment designs requiring qualified components.
What digital interface do the ADS7950QDBTRQ1 and ADS7955QDBTRQ1 use?
Both devices use a SPI-compatible serial interface for configuration and data readout, supporting daisy-chain operation and a dedicated interrupt/output pin. The interface allows the host controller to program the input range, channel selection, and power-down modes.
Can the ADS7950QDBTRQ1 be replaced by the ADS7955QDBTRQ1 in an existing design?
Not as a direct drop-in replacement. While both share the same package, resolution, sampling rate, and supply requirements, the ADS7955QDBTRQ1 offers 8 channels versus 4 on the ADS7950QDBTRQ1, and the analog input pinout differs. Any substitution requires reviewing the pin assignments, PCB layout, and firmware channel addressing against the manufacturer datasheet.