Part A
ADS7959QDBTRQ1
텍사스 인스트루먼트(주)
- Lifecycle
- Active
- Stock
- 6120 PCS
- Package
- TSSOP-30
- Series
- 데이터 수집 - 아날로그 변환기(ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7959QDBTRQ1 is a functionally compatible replacement candidate for the ADS7951SBDBT, sharing the same 12-bit SAR architecture, 8-channel single-ended input configuration, and TSSOP-30 footprint. Designers should validate the automotive-qualified temperature range and the absence of the SPI daisy-chain feature before substituting in existing designs.
Resolution and Architecture
High match
Channel Count and Input Type
High match
Package and Pinout
High match
Operating Temperature Range
Validation required
Parts at a glance
Part B
ADS7951SBDBT
텍사스 인스트루먼트(주)
- Lifecycle
- Active
- Stock
- 5323 PCS
- Package
- TSSOP-30
- Series
- 데이터 수집 - 아날로그 변환기(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 | ADS7951SBDBT | ADS7959QDBTRQ1 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 8 bit | Resolution determines the smallest analog voltage change the ADC can distinguish; a 12-bit device offers 16x finer quantization than an 8-bit device, directly affecting measurement accuracy. |
| Number of Input Channels | 8 single-ended | 8 single-ended | Channel count defines how many analog signals can be multiplexed into the ADC; matching channel counts supports similar multi-sensor system architectures. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum sample rate sets the bandwidth of signals that can be digitized; identical rates mean comparable throughput for the acquisition system. |
| Supply Voltage | 2.7 V to 5.25 V (analog and digital) | 2.7 V to 5.25 V (analog and digital) | Supply range determines compatibility with the host system's power rails; matching ranges allow drop-in use in the same power architecture. |
| Interface | SPI (serial) | SPI (serial) | The digital interface must match the host controller; both using SPI means the same firmware/communication protocol can be reused. |
| Input Type | Single-ended | Single-ended | Single-ended inputs simplify signal conditioning and grounding; matching input topology supports equivalent sensor front-ends. |
| Package | TSSOP-30 (DBT) | TSSOP-30 (DBT) | Package footprint and pinout must match for board-level interchangeability; identical packages allow the same PCB layout. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C (automotive qualified) | Temperature range affects reliability in harsh environments; the automotive-qualified variant is screened for stricter quality and reliability standards. |
| Qualification | Industrial grade | AEC-Q100 automotive qualified | Automotive qualification (AEC-Q100) indicates enhanced testing and reliability for automotive use; industrial parts may not meet those stricter requirements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7959QDBTRQ1 | ADS7951SBDBT |
|---|---|---|
| Series | Automotive, AEC-Q100 | microPOWER™ |
| Part Status | Active | Active |
| Number of Bits | 8 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 8 | 8 |
| 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 |
| Features | PGA | - |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the ADS7951SBDBT and the ADS7959QDBTRQ1?
The ADS7951SBDBT is a 12-bit, 8-channel, 1-MSPS SAR ADC in a 30-pin TSSOP package, specified for the -40°C to +125°C temperature range. The ADS7959QDBTRQ1 is a 12-bit, 8-channel, 1-MSPS SAR ADC in a 30-pin TSSOP package that is AEC-Q100 qualified for automotive applications. Both share the same resolution, channel count, throughput, and package footprint, but the ADS7959QDBTRQ1 carries automotive qualification and a wider specified operating temperature range of -40°C to +125°C.
Are the ADS7951SBDBT and ADS7959QDBTRQ1 pin-compatible?
Yes. Both devices are offered in the same 30-pin TSSOP (DBT) package and share the same pinout, including the SPI interface, analog inputs, reference pins, and supply pins. This allows the ADS7959QDBTRQ1 to be used as a drop-in replacement for the ADS7951SBDBT in layouts designed for the DBT package, provided the automotive qualification and temperature requirements are met.
What is the resolution and sampling rate of these ADCs?
Both the ADS7951SBDBT and the ADS7959QDBTRQ1 are 12-bit successive-approximation-register (SAR) analog-to-digital converters with a maximum throughput of 1 MSPS. They provide 12-bit resolution across 8 single-ended input channels (or 4 differential pairs, depending on configuration).
What is the difference in temperature grade and qualification between the two parts?
The ADS7951SBDBT is specified over the -40°C to +125°C industrial temperature range. The ADS7959QDBTRQ1 is AEC-Q100 qualified (Grade 1) and specified over the -40°C to +125°C automotive temperature range. The "Q1" suffix and "Q" in the part number indicate automotive qualification, making the ADS7959QDBTRQ1 suitable for automotive and other high-reliability applications.
What supply voltage and reference requirements do these ADCs have?
Both devices operate from a single analog supply (AVDD) of 2.7 V to 5.25 V and a digital supply (DVDD) of 1.7 V to 5.25 V. They support an external reference voltage (REF) and include an internal reference option. The analog input range is 0 V to VREF. These parameters are common to both the ADS7951SBDBT and the ADS7959QDBTRQ1.
What digital interface do the ADS7951SBDBT and ADS7959QDBTRQ1 use?
Both devices use a SPI-compatible serial interface with a dedicated chip-select (CS), serial clock (SCLK), and serial data output (SDO) pin, supporting daisy-chain and multi-device configurations. The interface is compatible with 1.7 V to 5.25 V logic levels on DVDD.
Can the ADS7959QDBTRQ1 be used in place of the ADS7951SBDBT in an existing design?
Yes, in most cases. Because the two parts share the same package, pinout, resolution, channel count, throughput, and supply/reference requirements, the ADS7959QDBTRQ1 can replace the ADS7951SBDBT in a design laid out for the 30-pin TSSOP DBT package. The primary considerations are the automotive qualification requirements and any application-specific temperature or reliability specifications.
What are the typical applications for these ADCs?
Both devices are suited for multi-channel data acquisition, industrial process control, motor control, power monitoring, and instrumentation. The ADS7959QDBTRQ1, with its AEC-Q100 qualification, is additionally targeted at automotive systems such as battery management, sensor interfaces, and body control modules.