Part A
ADS7953QDBTRQ1
National Semiconductor
- Lifecycle
- Active
- Stock
- 1543 PCS
- Package
- TSSOP-38
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7953QDBTRQ1 is a functional replacement candidate for the ADS7950QDBTRQ1 within the same automotive-qualified family, sharing an identical TSSOP-30 footprint, SPI interface, and 12-bit SAR architecture. The primary distinction is channel count, with the ADS7953 offering 16 single-ended channels versus 4 on the ADS7950, so system-level validation of multiplexer timing and input configuration is advised before substitution.
Package Type
High match
Resolution
High match
Interface Type
High match
Channel Count
Validation required
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 | ADS7953QDBTRQ1 | Why it matters |
|---|---|---|---|
| Number of input channels | 4 single-ended | 16 single-ended | Channel count determines how many analog signals can be monitored; a 4-channel device cannot directly replace a 16-channel device in multi-sensor systems. |
| Resolution | 12 bit | 12 bit | Resolution sets the smallest measurable voltage step; matching resolution preserves measurement accuracy when substituting parts. |
| Sampling rate | 1 MSPS | 1 MSPS | Throughput must meet the system's signal bandwidth requirements; identical rates allow drop-in timing compatibility. |
| Supply voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Operating supply range must match the board's power rail; identical ranges ensure the same power design works for both parts. |
| Interface | SPI | SPI | The digital interface must be compatible with the host controller; matching SPI simplifies firmware and hardware reuse. |
| Package | TSSOP-30 | TSSOP-30 | Package footprint and pinout must match for board-level interchangeability; identical packages allow the same PCB land pattern. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +125 °C | Temperature range must cover the application environment; matching automotive-grade ranges ensures equivalent reliability. |
| Input type | Single-ended | Single-ended | Input configuration must match the sensor topology; both being single-ended means the same signal conditioning front-end applies. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7953QDBTRQ1 | ADS7950QDBTRQ1 |
|---|---|---|
| Series | Automotive, AEC-Q100 | Automotive, AEC-Q100 |
| Part Status | Active | Active |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 16 | 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 is the primary difference between the ADS7950QDBTRQ1 and ADS7953QDBTRQ1?
The main difference is the number of analog input channels. The ADS7950QDBTRQ1 is a 4-channel, 12-bit ADC, while the ADS7953QDBTRQ1 is a 16-channel, 12-bit ADC. Both are automotive-qualified (AEC-Q100 Grade 1) devices from Texas Instruments in a 38-pin TSSOP package.
Are the ADS7950QDBTRQ1 and ADS7953QDBTRQ1 pin-to-pin compatible?
No. Although both devices share the same 38-pin TSSOP (DBT) package, the ADS7950 uses fewer analog input pins, and the pin assignments for the analog inputs differ from the ADS7953. A direct PCB drop-in replacement is not possible without layout changes to accommodate the additional input channels of the ADS7953.
Do both devices share the same resolution and sampling rate?
Yes. Both the ADS7950QDBTRQ1 and ADS7953QDBTRQ1 are 12-bit successive-approximation register (SAR) ADCs with a maximum throughput of 1 MSPS, as specified in the Texas Instruments datasheet.
What is the analog input voltage range for these ADCs?
Both devices support a programmable analog input range of 0 V to VREF (full-scale) or 0 V to 2×VREF, where VREF is the external reference voltage. The input range is configured via the device's control register, per the TI datasheet.
What serial interface do the ADS7950QDBTRQ1 and ADS7953QDBTRQ1 use?
Both devices use an SPI-compatible serial interface supporting clock frequencies up to 20 MHz, allowing high-speed communication with host controllers. This is documented in the Texas Instruments datasheet for the ADS795x-Q1 family.
Are both components qualified for automotive applications?
Yes. Both the ADS7950QDBTRQ1 and ADS7953QDBTRQ1 carry the Q1 suffix, indicating AEC-Q100 qualification for automotive use. They are rated for operation over the automotive temperature range of –40°C to +125°C (Grade 1).
Can the ADS7950QDBTRQ1 be used as a substitute when a design requires more channels?
No. The ADS7950QDBTRQ1 provides only 4 analog input channels, whereas the ADS7953QDBTRQ1 provides 16. If a design requires more than 4 channels, the ADS7950 cannot serve as a substitute; the ADS7953 or an external multiplexer would be required.
What is the power supply requirement for these devices?
Both devices operate from a single analog supply (AVDD) of 2.7 V to 5.25 V and a digital supply (DVDD) of 1.7 V to 5.25 V, as specified in the Texas Instruments datasheet. This allows flexible interfacing with both 3.3 V and 5 V systems.