Part A
ADS7828EIPWRQ1
德州儀器
- Lifecycle
- Active
- Stock
- 5341 件
- Package
- TSSOP-16
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADS7828EIPWRQ1 and ADS7817EB/2K5G4 differ fundamentally in architecture, channel count, digital interface, and package footprint, so they are not interchangeable in a common design. The ADS7828EIPWRQ1 is an 8-channel, 12-bit SAR ADC with an I2C interface in a TSSOP-16 package, while the ADS7817EB/2K5G4 is a single-channel, 12-bit SAR ADC with a serial SPI-compatible interface in a much smaller package. Substitution would require a full redesign of the analog front end, digital bus, and board layout rather than a direct swap.
Different channel count
Different digital interface
Different package footprint
Different input architecture
Parts at a glance
Part B
ADS7817EB/2K5G4
德州儀器
- Lifecycle
- Active
- Stock
- 2794 件
- Package
- TSSOP-8
- Series
- 資料獲取-模數轉換器（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 | ADS7828EIPWRQ1 | ADS7817EB/2K5G4 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so nominal measurement precision is equivalent. |
| Number of Input Channels | 8 (single-ended) / 4 (pseudo-differential) | 1 (pseudo-differential) | Channel count determines how many signals can be multiplexed into one converter; the ADS7828 supports multi-channel systems while the ADS7817 is single-channel. |
| Sampling Rate | 50 kSPS | 200 kSPS | Maximum throughput affects the bandwidth of signals that can be digitized; the ADS7817 is four times faster. |
| Interface Type | I2C (2-wire) | SPI (serial) | The digital interface must match the host controller; I2C and SPI are not directly interchangeable without bus changes. |
| Supply Voltage | 2.7 V to 5.5 V | 4.75 V to 5.25 V | Operating supply range determines compatibility with low-voltage or 5 V systems; the ADS7828 supports wider low-voltage operation. |
| Input Type | Single-ended / pseudo-differential | Pseudo-differential | Input configuration affects how signals are referenced and measured; single-ended support in the ADS7828 simplifies multi-signal sensing. |
| Package | TSSOP-16 | SOIC-8 | Footprint and pin count must match the PCB layout; these packages are not drop-in compatible. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both meet the same industrial temperature range, so environmental compatibility is equivalent. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7828EIPWRQ1 | ADS7817EB/2K5G4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 50k | 200k |
| Number of Inputs | 8 | 1 |
| Input Type | Differential, Single Ended | Differential |
| Data Interface | I²C | SPI |
| Configuration | MUX-S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External |
| Voltage - Supply, Analog | 2.7V ~ 3.6V, 5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Series | Automotive, AEC-Q100 | - |
Frequently asked questions
What are the key architectural differences between the ADS7828EIPWRQ1 and the ADS7817EB/2K5G4?
The ADS7828EIPWRQ1 is an 8-channel, 12-bit successive-approximation register (SAR) analog-to-digital converter with an I2C interface, housed in a TSSOP-16 package. The ADS7817EB/2K5G4 is a single-channel, 12-bit SAR ADC with a serial SPI-compatible interface, offered in an SOIC-8 package. The ADS7828EIPWRQ1 integrates an 8-channel input multiplexer, while the ADS7817EB/2K5G4 provides a single differential input pair.
Are the ADS7828EIPWRQ1 and ADS7817EB/2K5G4 pin-to-pin or package compatible?
No. The ADS7828EIPWRQ1 uses a 16-pin TSSOP package, whereas the ADS7817EB/2K5G4 uses an 8-pin SOIC package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for each other.
Do both devices support the same digital communication interface?
No. The ADS7828EIPWRQ1 communicates via an I2C interface, supporting standard and fast modes. The ADS7817EB/2K5G4 uses a serial SPI-compatible interface for data output and control. System-level interface requirements must be matched accordingly.
How do the input channel configurations compare between the two ADCs?
The ADS7828EIPWRQ1 provides an 8-channel input multiplexer that can be configured as single-ended or pseudo-differential inputs. The ADS7817EB/2K5G4 provides a single differential input pair (IN+ and IN-). The ADS7828EIPWRQ1 is suited for multi-channel signal acquisition, while the ADS7817EB/2K5G4 targets single-channel differential measurement.
Are both parts qualified for automotive applications?
The ADS7828EIPWRQ1 carries the Q1 suffix, indicating it is qualified to the automotive AEC-Q100 standard per Texas Instruments documentation. The ADS7817EB/2K5G4 does not carry an automotive Q1 designation in its part number and should not be assumed to be AEC-Q100 qualified without separate verification from the manufacturer.
What are the resolution and sampling characteristics of each device?
Both devices are 12-bit SAR ADCs. The ADS7828EIPWRQ1 offers a throughput rate of up to 50 kSPS per its datasheet. The ADS7817EB/2K5G4 offers a throughput rate of up to 200 kSPS. Designers should confirm sampling rate requirements against the respective datasheet specifications.
Can the ADS7817EB/2K5G4 directly replace the ADS7828EIPWRQ1 in an existing design?
No. Differences in package footprint, pin count, interface protocol (SPI vs. I2C), channel count (1 differential vs. 8 multiplexed), and automotive qualification prevent a direct replacement. A redesign of the PCB and firmware would be required.