Part A
ADS7951SBDBT
Texas Instruments
- Lifecycle
- Active
- Stock
- 5323 Stückzahl
- Package
- TSSOP-30
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7951SBDBT is a functional replacement candidate for the ADS7953SBDBTR only when the reduced channel count is acceptable; both share the same package, interface, and reference architecture, but the ADS7953SBDBTR provides twice the single-ended and pseudo-differential input channels, so system-level revalidation of multiplexer timing and channel sequencing is required before substitution.
Channel Count
Validation required
Package Type
High match
Resolution
High match
Supply Voltage
High match
Parts at a glance
Part B
ADS7953SBDBTR
Texas Instruments
- Lifecycle
- Active
- Stock
- 6896 Stückzahl
- Package
- TSSOP-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 | ADS7953SBDBTR | ADS7951SBDBT | Why it matters |
|---|---|---|---|
| Number of Input Channels | 16 | 8 | Determines how many analog signals can be multiplexed into the ADC; a 16-channel device can replace an 8-channel one only if the extra channels are unused or the system is redesigned. |
| Resolution | 12 bit | 12 bit | Both provide the same quantization granularity, so measurement precision and LSB size are equivalent for a given reference voltage. |
| Sampling Rate | 1 MSPS | 1 MSPS | Identical throughput means timing budgets and anti-aliasing filter requirements remain unchanged when substituting one part for the other. |
| Supply Voltage (Analog and Digital) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Matching supply ranges allow the same power rail design to be reused without level shifting or regulator changes. |
| Interface Type | SPI (Serial) | SPI (Serial) | A common SPI interface means the same host controller firmware and bus wiring can be used for either device. |
| Input Type | Single-ended | Single-ended | Both accept single-ended inputs, so signal conditioning circuitry and grounding schemes remain compatible. |
| Package | TSSOP-38 (DBT) | TSSOP-38 (DBT) | Identical package and pin count simplify PCB layout reuse, though pin functions must still be verified against the datasheet. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Both are rated for the same extended industrial temperature range, so thermal derating and enclosure requirements are unchanged. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7951SBDBT | ADS7953SBDBTR |
|---|---|---|
| Series | microPOWER™ | microPOWER™ |
| Part Status | Active | Active |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 8 | 16 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-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 |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the ADS7953SBDBTR and the ADS7951SBDBT?
The ADS7953SBDBTR is a 12-bit, 16-channel successive-approximation register (SAR) analog-to-digital converter, while the ADS7951SBDBT is a 12-bit, 8-channel SAR ADC. Both are members of the Texas Instruments ADS795x family and share the same 30-pin TSSOP (DBT) package and 1 MSPS maximum throughput, but they differ in the number of analog input channels (16 vs. 8).
Do the ADS7953SBDBTR and ADS7951SBDBT have the same package and pinout?
Both devices are offered in the same 30-pin TSSOP (DBT) package. However, because the ADS7953 provides 16 input channels and the ADS7951 provides 8, the analog input pin assignments differ between the two devices. Designers must consult the respective datasheet pin configurations before considering any board-level substitution.
What is the maximum sampling rate of these two ADCs?
Both the ADS7953SBDBTR and ADS7951SBDBT are specified for a maximum throughput of 1 MSPS (1 megasample per second) when operating from a 2.7 V to 5.25 V analog supply, per the Texas Instruments ADS795x datasheet.
What is the resolution and interface type of the ADS7953SBDBTR and ADS7951SBDBT?
Both parts are 12-bit resolution SAR ADCs featuring a SPI-compatible serial interface. They support daisy-chain operation and are available with a serial interface that can be configured for either SPI, QSPI, or MICROWIRE compatibility, as documented in the ADS795x family datasheet.
Can the ADS7951SBDBT be used as a drop-in replacement for the ADS7953SBDBTR?
No. Although both share the same 30-pin TSSOP package and 12-bit, 1 MSPS SAR architecture, the ADS7953 has 16 analog input channels while the ADS7951 has only 8. The pin functions and channel addressing differ, so a direct drop-in replacement is not possible without verifying pinout compatibility and updating the system firmware and PCB layout.
What are the analog supply voltage ranges for these devices?
Per the Texas Instruments ADS795x datasheet, both the ADS7953SBDBTR and ADS7951SBDBT operate from an analog supply (AVDD) of 2.7 V to 5.25 V and a digital supply (DVDD) of 1.7 V to 5.25 V, allowing flexible interfacing with low-voltage digital hosts.
What is the operating temperature range for the ADS7953SBDBTR and ADS7951SBDBT?
Both devices are specified for the industrial temperature range of -40°C to +125°C, as stated in the Texas Instruments ADS795x family datasheet for the DBT (TSSOP) package options.