Part A
ADS7959QDBTRQ1
Texas Instruments
- Lifecycle
- Active
- Stock
- 6120 Stückzahl
- Package
- TSSOP-30
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7953SBDBTG4 is a viable functional replacement candidate for the ADS7959QDBTRQ1 in many applications, though it is not a pin-for-pin drop-in. Both are 12-bit SAR ADCs from the ADS795x family in the same TSSOP-38 package, but they differ in channel count, input configuration, and qualification grade. The ADS7953S offers 16 single-ended channels versus 8 on the ADS7959Q, and it is rated for the industrial temperature range rather than automotive AEC-Q100 qualification. Engineers should validate channel mapping, input multiplexer configuration, and qualification requirements before substituting.
Channel Count
Validation required
Input Configuration
Validation required
Package Type
High match
Qualification Grade
Not compatible
Parts at a glance
Part B
ADS7953SBDBTG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 4855 Stückzahl
- Package
- TFSOP-38
- Series
- Datenerfassung mit Analog to Digital Converters (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 | ADS7959QDBTRQ1 | ADS7953SBDBTG4 | Why it matters |
|---|---|---|---|
| Resolution | 8 bit | 12 bit | Resolution determines the smallest measurable voltage step; a 12-bit device offers 16x finer quantization than an 8-bit device, directly affecting measurement accuracy. |
| Number of Input Channels | 8 single-ended | 16 single-ended | Channel count defines how many analog signals can be multiplexed into the ADC; the 16-channel part supports twice as many inputs, affecting system architecture. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum sample rate sets the bandwidth of signals that can be digitized; identical rates mean comparable throughput for both parts. |
| 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's signal chain and reference levels; matching ranges allow drop-in substitution. |
| Interface Type | SPI | SPI | The digital interface must match the host controller; both using SPI simplifies firmware and hardware reuse. |
| Package / Pin Count | TSSOP-30 | TSSOP-38 | Package and pin count affect PCB footprint and layout; different footprints prevent direct board-level substitution. |
| Input Type | Single-ended | Single-ended | Input configuration determines whether differential or single-ended sensors can be connected; both being single-ended keeps signal conditioning similar. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Temperature range indicates suitability for automotive/industrial environments; matching ranges support equivalent environmental robustness. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7959QDBTRQ1 | ADS7953SBDBTG4 |
|---|---|---|
| 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 | 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 | 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 ADS7959QDBTRQ1 and the ADS7953SBDBTG4?
The ADS7959QDBTRQ1 is an automotive-qualified (AEC-Q100 Grade 1) 8-channel, 12-bit SAR ADC with a 1 MSPS maximum throughput, specified over the -40°C to +125°C temperature range. The ADS7953SBDBTG4 is a 16-channel, 12-bit SAR ADC with a 1 MSPS maximum throughput in a TSSOP-38 package, specified over the -40°C to +125°C industrial temperature range. The primary differences are channel count (8 vs 16), qualification grade (automotive Q1 vs industrial), and package (VQFN vs TSSOP).
Are the ADS7959QDBTRQ1 and ADS7953SBDBTG4 pin-to-pin or footprint compatible?
No. The ADS7959QDBTRQ1 is supplied in a 24-pin VQFN package, while the ADS7953SBDBTG4 is supplied in a 38-pin TSSOP package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for one another.
Do both devices share the same SPI interface and reference architecture?
Yes. Both are part of the ADS795x family and use a SPI-compatible serial interface with a similar command structure, and both support an internal reference with a programmable reference voltage range. This family-level commonality allows firmware reuse, but the different channel counts and package pinouts must be accounted for in hardware design.
Which device is suitable for automotive applications?
The ADS7959QDBTRQ1 is the automotive-qualified option, carrying the Q1 designation and AEC-Q100 Grade 1 qualification, making it appropriate for automotive signal-chain designs. The ADS7953SBDBTG4 is an industrial-grade device and does not carry the automotive Q1 qualification.
How do the channel counts affect system design when choosing between these two ADCs?
The ADS7959QDBTRQ1 provides 8 analog input channels, while the ADS7953SBDBTG4 provides 16 analog input channels. Designs requiring more than 8 single-ended inputs should select the 16-channel ADS7953SBDBTG4 or use an external multiplexer with the 8-channel device, subject to validation against the datasheet.
Do both converters offer the same maximum sampling rate and resolution?
Yes. Both the ADS7959QDBTRQ1 and the ADS7953SBDBTG4 are 12-bit successive-approximation register (SAR) ADCs with a maximum throughput of 1 MSPS, as specified in their respective manufacturer datasheets.
Can the ADS7953SBDBTG4 be used as a substitute for the ADS7959QDBTRQ1 in an existing design?
Not directly. Although both are 12-bit, 1 MSPS SAR ADCs from the same family, the ADS7953SBDBTG4 has 16 channels versus 8 on the ADS7959QDBTRQ1, uses a different package (TSSOP-38 vs VQFN-24), and lacks the automotive Q1 qualification. Any substitution requires a full review of channel mapping, PCB layout, and qualification requirements against the manufacturer datasheets.