Part A
ADS7951SBDBT
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 5323 個数
- Package
- TSSOP-30
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7957QDBTRQ1 and ADS7951SBDBT share the same 12-bit SAR ADC architecture, TSSOP-38 package, and 1 MSPS throughput, making them functionally comparable in core conversion performance. However, the ADS7957QDBTRQ1 offers 16 input channels versus 8 on the ADS7951SBDBT, and the two devices differ in input configuration and automotive qualification status. Designers should validate channel count requirements, input multiplexer configuration, and qualification grade before substituting one for the other in a given application.
Resolution and Throughput
High match
Package Type
High match
Channel Count
Validation required
Input Configuration
Not compatible
Parts at a glance
Part B
ADS7957QDBTRQ1
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 2380 個数
- Package
- TSSOP-38
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | ADS7951SBDBT | Why it matters |
|---|---|---|---|
| Resolution | 10 bit | 12 bit | Resolution determines the smallest measurable voltage step; a 12-bit ADC provides 4x finer quantization than a 10-bit ADC, affecting measurement accuracy. |
| Number of Input Channels | 16 | 8 | Channel count defines how many analog signals can be multiplexed into a single ADC; the 16-channel device supports twice as many inputs as the 8-channel device. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum throughput affects the bandwidth of signals that can be digitized; both devices offer the same 1 MSPS conversion rate. |
| Input Type | Single-ended | Single-ended | Input configuration determines whether the ADC measures signals relative to ground or differentially; both are single-ended devices. |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Operating supply range must match the system rail; both parts support the same wide analog supply range. |
| Interface | SPI | SPI | The digital interface must be compatible with the host controller; both devices use a standard SPI serial interface. |
| Package | TSSOP-38 | TSSOP-38 | Package footprint and pin count affect PCB layout and drop-in compatibility; both parts share the same TSSOP-38 package. |
| Operating Temperature Range | -40 °C to 125 °C | -40 °C to 125 °C | Temperature range determines suitability for automotive and industrial environments; both parts are rated over the same extended range. |
| Qualification | AEC-Q100 (Automotive) | Industrial | Automotive qualification indicates enhanced reliability testing; the Q1 part is AEC-Q100 qualified while the S part is industrial grade. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7951SBDBT | ADS7957QDBTRQ1 |
|---|---|---|
| Series | microPOWER™ | Automotive, AEC-Q100 |
| Part Status | Active | Active |
| Number of Bits | 12 | 10 |
| 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-PGA-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 ADS7951SBDBT?
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 ADS7951SBDBT is a 12-bit, 8-channel, 1-MSPS SAR ADC in a 30-pin TSSOP package. The ADS7957QDBTRQ1 offers higher channel count and automotive qualification, whereas the ADS7951SBDBT provides higher resolution (12-bit vs 10-bit) with fewer channels.
Do the ADS7957QDBTRQ1 and ADS7951SBDBT have the same resolution?
No. The ADS7957QDBTRQ1 is a 10-bit ADC, while the ADS7951SBDBT is a 12-bit ADC. The ADS7951SBDBT therefore provides 4x finer quantization (4096 vs 1024 codes) over the same input range.
How do the channel counts of these two ADCs compare?
The ADS7957QDBTRQ1 provides 16 single-ended input channels, whereas the ADS7951SBDBT provides 8 single-ended input channels. Designs requiring more analog inputs should favor the ADS7957QDBTRQ1, while the ADS7951SBDBT suits lower-channel-count, higher-resolution applications.
Are the ADS7957QDBTRQ1 and ADS7951SBDBT pin-to-pin or package compatible?
No. The ADS7957QDBTRQ1 is supplied in a 38-pin TSSOP (DBT) package, and the ADS7951SBDBT is supplied in a 30-pin TSSOP (DBT) package. The differing pin counts and pinouts mean they are not drop-in replacements and require separate PCB layouts.
What is the maximum sampling rate of each device?
Both the ADS7957QDBTRQ1 and the ADS7951SBDBT are specified for a maximum throughput of 1 MSPS. The sample rate is therefore equivalent between the two parts.
Does the ADS7957QDBTRQ1 carry automotive qualification that the ADS7951SBDBT does not?
Yes. The ADS7957QDBTRQ1 is AEC-Q100 qualified (Grade 1, -40°C to +125°C ambient), making it suitable for automotive applications. The ADS7951SBDBT is an industrial-grade device and is not presented as AEC-Q100 qualified in its datasheet.
What serial interface do these ADCs use?
Both devices use an SPI-compatible serial interface for configuration and data readback, allowing connection to common microcontrollers and DSPs. The interface supports daisy-chain and multi-device configurations per the respective datasheets.
Can the ADS7951SBDBT replace the ADS7957QDBTRQ1 in an existing design?
Not directly. The ADS7951SBDBT has fewer channels (8 vs 16), a different package and pinout (30-pin vs 38-pin TSSOP), and lacks the automotive qualification of the ADS7957QDBTRQ1. A replacement requires PCB redesign and validation against the target application's channel-count, resolution, and qualification requirements.