Part A
ADS7953SBDBTR
Texas Instruments
- Lifecycle
- Active
- Stock
- 6896 PCS
- Package
- TSSOP-38
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7952SBDBTG4 is a functional replacement candidate for the ADS7953SBDBTR, sharing the same TSSOP-38 package, 12-bit SAR architecture, and 1 MSPS throughput, but it provides 12 analog input channels instead of 16. Designers must verify that the reduced channel count satisfies system requirements and confirm the input configuration before substituting.
Resolution
High match
Package Type
High match
Channel Count
Validation required
Sampling Rate
High match
Parts at a glance
Part B
ADS7952SBDBTG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 3680 PCS
- Package
- TFSOP-38
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | ADS7952SBDBTG4 | Why it matters |
|---|---|---|---|
| Number of Input Channels | 16 | 12 | Channel count determines how many analog signals can be multiplexed into the ADC; a 16-channel part cannot be directly substituted where 12 channels are required without leaving inputs unused, and vice versa. |
| Resolution | 12 bit | 12 bit | Resolution sets the smallest measurable voltage step; matching resolution ensures equivalent measurement precision in the target application. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum throughput must meet the signal bandwidth requirements; identical rates mean timing and anti-aliasing design carry over unchanged. |
| Supply Voltage (Analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | The analog supply range defines compatibility with the system rail and input signal swing; matching ranges allow drop-in use on the same power rail. |
| Interface Type | SPI | SPI | The digital interface must match the host controller; identical SPI interfaces mean firmware and bus timing can be reused. |
| Input Type | Single-ended | Single-ended | Single-ended versus differential input topology affects signal conditioning and grounding; matching types preserves the analog front-end design. |
| Package / Mounting | TSSOP-38, Surface Mount | TSSOP-38, Surface Mount | Package and footprint must match for PCB layout compatibility; identical packages allow the same land pattern to be used. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The temperature range must cover the application environment; matching industrial ranges ensure equivalent reliability margins. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7953SBDBTR | ADS7952SBDBTG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Series | microPOWER™ | microPOWER™ |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 16 | 12 |
| 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 | 2.7V ~ 5.25V | 1.7V ~ 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 ADS7952SBDBTG4?
The ADS7953SBDBTR is a 12-bit, 16-channel successive-approximation register (SAR) analog-to-digital converter, while the ADS7952SBDBTG4 is a 12-bit, 12-channel SAR ADC. Both are part of the Texas Instruments ADS795x family and share the same TSSOP-38 (DBT) package and serial interface, but they differ in the number of analog input channels (16 vs. 12).
Are the ADS7953SBDBTR and ADS7952SBDBTG4 pin-compatible?
Both devices are offered in the same 38-pin TSSOP (DBT) package, but they are not functionally pin-compatible because the ADS7953 uses all 16 analog input channels while the ADS7952 provides only 12. The additional input pins on the ADS7953 are not available as analog inputs on the ADS7952, so PCB designs must account for this channel-count difference.
Do both devices support the same serial interface and sampling rate?
Yes. Both the ADS7953SBDBTR and ADS7952SBDBTG4 use a SPI-compatible serial interface and are specified for a maximum sampling rate of 1 MSPS at 12-bit resolution, consistent with the Texas Instruments ADS795x family datasheet.
What is the analog input voltage range for these ADCs?
Both devices operate from a single analog supply (AVDD) and support a programmable input range of 0 V to VREF (with VREF up to AVDD), where the full-scale input range is set by the external reference voltage. Designers should consult the ADS795x datasheet for the exact reference and supply limits before finalizing the input range.
Can the ADS7952SBDBTG4 be used as a drop-in replacement for the ADS7953SBDBTR?
No. Although both are 12-bit, 1-MSPS SAR ADCs in the same TSSOP-38 package, the ADS7952 provides only 12 analog input channels versus 16 on the ADS7953. A drop-in replacement is not possible if the design uses channels 13 through 16; otherwise, firmware and PCB channel mapping must be revalidated.
What is the significance of the "G4" suffix on the ADS7952SBDBTG4?
The "G4" suffix indicates a green/RoHS-compliant package variant per Texas Instruments ordering conventions. Functionally, the ADS7952SBDBTG4 is the same 12-bit, 12-channel SAR ADC as the non-G4 version, with the difference limited to environmental compliance and package finish.
Which device should be selected for an application requiring 16 analog input channels?
The ADS7953SBDBTR should be selected, as it provides 16 single-ended analog input channels. The ADS7952SBDBTG4 offers only 12 channels and would not cover a 16-channel requirement without external multiplexing.