Part A
ADS7957QDBTRQ1
Texas Instruments
- Lifecycle
- Active
- Stock
- 2380 Stückzahl
- Package
- TSSOP-38
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7957QDBTRQ1 and ADS7953SBDBTG4 are both 12-bit, multi-channel SAR ADCs from the ADS795x family in TSSOP-38 packages, sharing the same SPI interface and automotive qualification. However, they differ in channel count and analog input configuration, so the ADS7953SBDBTG4 can serve as a functional substitute only when the reduced channel count and single-ended input architecture satisfy the target application requirements. Designers should validate channel count sufficiency and input configuration compatibility before committing to a replacement.
Channel Count
Validation required
Analog Input Configuration
Validation required
Package Type
High match
Resolution and Interface
High match
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 | ADS7957QDBTRQ1 | ADS7953SBDBTG4 | Why it matters |
|---|---|---|---|
| Resolution | 10 bit | 12 bit | Resolution determines the smallest measurable voltage step; a 12-bit device offers 4x finer quantization than a 10-bit device, affecting measurement accuracy. |
| Number of Input Channels | 16 | 16 | Channel count defines how many analog signals can be multiplexed into the ADC; matching counts preserve system-level input capacity. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum sample rate limits the bandwidth of signals that can be digitized; equal rates mean comparable throughput for the same input bandwidth. |
| Supply Voltage (Analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Analog supply range determines compatibility with the surrounding analog front-end and reference levels. |
| Interface Type | SPI | SPI | The digital interface must match the host controller; both use SPI, so firmware and bus wiring remain compatible. |
| Package / Case | TSSOP-38 (DBT) | TSSOP-38 (DBT) | Package footprint and pinout must match for board-level drop-in compatibility; identical TSSOP-38 packages allow the same PCB land pattern. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Temperature range determines suitability for automotive and industrial environments; matching ranges preserve environmental qualification. |
| Input Type | Single-ended | Single-ended | Single-ended versus differential input topology affects signal conditioning and noise immunity requirements in the analog front-end. |
| Reference Type | External | External | Reference configuration affects full-scale range and accuracy; both requiring an external reference means the same reference circuit can be reused. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7957QDBTRQ1 | ADS7953SBDBTG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Series | Automotive, AEC-Q100 | microPOWER™ |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 10 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 16 | 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 ADS7957QDBTRQ1 and the ADS7953SBDBTG4?
The ADS7957QDBTRQ1 is an automotive-qualified (AEC-Q100 Grade 1) 10-bit, 16-channel, 1-MSPS SAR ADC in a 38-pin TSSOP package, while the ADS7953SBDBTG4 is a non-automotive 12-bit, 16-channel, 1-MSPS SAR ADC in a 38-pin TSSOP package. The primary differences are resolution (10-bit vs 12-bit) and qualification grade (automotive Q1 vs industrial).
Are the ADS7957QDBTRQ1 and ADS7953SBDBTG4 pin-compatible?
Both devices are offered in the same 38-pin TSSOP (DBT) package and belong to the same ADS795x family, sharing a common pinout for the analog inputs, SPI interface, and power supplies. However, designers should verify the specific pin functions against each respective datasheet before layout substitution, since configuration and control register behavior may differ between the 10-bit and 12-bit variants.
What is the resolution and sampling rate of each device?
The ADS7957QDBTRQ1 provides 10-bit resolution with a maximum throughput of 1 MSPS. The ADS7953SBDBTG4 provides 12-bit resolution with a maximum throughput of 1 MSPS. Both use a successive-approximation register (SAR) architecture with an integrated sample-and-hold circuit.
How many analog input channels does each ADC support?
Both the ADS7957QDBTRQ1 and the ADS7953SBDBTG4 provide 16 single-ended analog input channels. The channels can be configured through the SPI-compatible serial interface to operate in single-ended or pseudo-differential modes, depending on the device configuration registers.
What is the difference in automotive qualification between the two parts?
The ADS7957QDBTRQ1 carries the Q1 suffix, indicating AEC-Q100 qualification for automotive applications, and is specified over the Grade 1 temperature range of -40°C to +125°C. The ADS7953SBDBTG4 is an industrial-grade device and does not carry AEC-Q100 qualification; its operating temperature range should be confirmed from the manufacturer datasheet.
What serial interface do these ADCs use?
Both devices use an SPI-compatible serial interface for configuration and data readout, supporting daisy-chain operation and multiple device configurations. The interface operates from a separate digital supply and supports standard SPI modes for communication with host microcontrollers or FPGAs.
Can the ADS7953SBDBTG4 be used as a drop-in replacement for the ADS7957QDBTRQ1 in an automotive design?
No. Although both share the same package and family architecture, the ADS7953SBDBTG4 is not AEC-Q100 qualified and therefore does not meet automotive qualification requirements. For automotive designs requiring Q1 qualification, the ADS7957QDBTRQ1 or another AEC-Q100-qualified equivalent should be used.
What are the supply voltage requirements for these devices?
Both devices operate from a single analog supply (AVDD) and a separate digital supply (DVDD), with the analog input range referenced to an external reference voltage. Specific minimum and maximum supply voltages, as well as reference voltage limits, should be verified from the respective manufacturer datasheets, as they define the valid operating conditions for each part.