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 ADS7817EC/250G4 are not functionally interchangeable. The ADS7828EIPWRQ1 is an 8-channel, 12-bit SAR ADC with an I2C interface in a TSSOP-16 package, while the ADS7817EC/250G4 is a single-channel, 12-bit SAR ADC with a serial SPI interface in an MSOP-8 package. The differences in channel count, digital interface, package footprint, and supply voltage range make direct substitution impractical without a board redesign.
Different channel count
Different digital interface
Different package footprint
Different supply voltage range
Parts at a glance
Part B
ADS7817EC/250G4
德州儀器
- Lifecycle
- Active
- Stock
- 4840 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 | ADS7817EC/250G4 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both converters provide 12-bit resolution, so the achievable measurement precision is comparable. |
| Number of Input Channels | 8 (single-ended) / 4 (pseudo-differential) | 1 (pseudo-differential) | Channel count determines how many signals can be monitored; the ADS7828 supports multiplexed multi-channel acquisition while the ADS7817 handles a single channel. |
| Sampling Rate | 50 kSPS | 200 kSPS | Maximum throughput affects the ability to capture fast-changing signals; the ADS7817 samples four times faster. |
| Interface Type | I2C | SPI | 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 voltage range determines compatibility with the system power rail; the ADS7828 supports lower-voltage supplies. |
| Input Type | Single-ended / pseudo-differential | Pseudo-differential | Input configuration affects how signals are referenced and wired; the ADS7828 offers more flexible single-ended inputs. |
| Package / Mounting | 16-TSSOP (surface mount) | 8-VSSOP (surface mount) | Footprint and pin count must match the PCB layout; the two parts are not drop-in compatible. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both parts support the same industrial temperature range, so environmental tolerance is equivalent. |
| Reference Type | External | External | Both require an external voltage reference, so reference design and accuracy considerations are similar. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7828EIPWRQ1 | ADS7817EC/250G4 |
|---|---|---|
| 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 differences between the ADS7828EIPWRQ1 and the ADS7817EC/250G4?
The ADS7828EIPWRQ1 is an 8-channel, 12-bit SAR ADC with an I2C interface, supplied in a TSSOP-16 package and qualified to AEC-Q100 for automotive applications. The ADS7817EC/250G4 is a single-channel, 12-bit SAR ADC with a serial (SPI-compatible) interface, supplied in an 8-pin VSSOP package and specified for the industrial temperature range. The two devices differ in channel count, digital interface, package, and qualification grade.
Are the ADS7828EIPWRQ1 and ADS7817EC/250G4 pin-to-pin or footprint compatible?
No. The ADS7828EIPWRQ1 uses a 16-pin TSSOP package, while the ADS7817EC/250G4 uses an 8-pin VSSOP package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for each other.
What digital interfaces do these two ADCs use?
The ADS7828EIPWRQ1 communicates over an I2C interface, supporting standard and fast modes. The ADS7817EC/250G4 uses a serial interface compatible with SPI, QSPI, and MICROWIRE, with a dedicated chip-select and serial clock. The interface choice affects host controller selection and firmware design.
How do the input configurations of the ADS7828EIPWRQ1 and ADS7817EC/250G4 differ?
The ADS7828EIPWRQ1 provides 8 input channels that can be configured as single-ended or pseudo-differential pairs, selectable via its I2C command set. The ADS7817EC/250G4 provides a single pseudo-differential input channel. Designs requiring multiple monitored signals will favor the ADS7828EIPWRQ1, while single-channel acquisition suits the ADS7817EC/250G4.
What are the resolution and sampling characteristics of these ADCs?
Both devices are 12-bit successive-approximation register (SAR) ADCs. The ADS7828EIPWRQ1 supports a throughput rate of up to 50 kSPS. The ADS7817EC/250G4 supports a throughput rate of up to 200 kSPS. The higher sample rate of the ADS7817EC/250G4 suits faster single-channel acquisition, while the ADS7828EIPWRQ1 trades sample rate for multi-channel capability.
What are the supply voltage and temperature range specifications for each device?
The ADS7828EIPWRQ1 operates from a single 2.7 V to 5.5 V supply and is specified over the automotive temperature range of -40°C to +125°C, consistent with its AEC-Q100 qualification. The ADS7817EC/250G4 operates from a single 5 V supply and is specified over the industrial temperature range of -40°C to +85°C. Verify exact limits against the respective manufacturer datasheets for the target design.
Can the ADS7828EIPWRQ1 be used as a substitute for the ADS7817EC/250G4 in an existing design?
Not directly. Substitution requires changes to the PCB footprint (16-pin TSSOP versus 8-pin VSSOP), the digital interface (I2C versus SPI-compatible serial), the input channel configuration, and the supply voltage range. The ADS7828EIPWRQ1 also offers a lower maximum throughput rate than the ADS7817EC/250G4. Any substitution must be validated against both datasheets and the target application requirements.
Which device is better suited for automotive versus general industrial applications?
The ADS7828EIPWRQ1 carries AEC-Q100 qualification and is specified to +125°C, making it the appropriate choice for automotive and other high-temperature applications. The ADS7817EC/250G4 is specified over the industrial temperature range of -40°C to +85°C and is intended for general industrial and instrumentation use. Selection should be based on the qualification and temperature requirements of the end application.