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 ADS7834E/250G4 are not drop-in replacements for each other. The ADS7828EIPWRQ1 is an 8-channel, 12-bit SAR ADC with an I2C interface in a TSSOP-16 package, while the ADS7834E/250G4 is a single-channel, 12-bit SAR ADC with a serial interface in an MSOP-8 package. The differences in channel count, digital interface, package footprint, and pinout make them functionally incompatible without a board redesign.
Different channel count
Different digital interface
Different package footprint
Different pinout
Parts at a glance
Part B
ADS7834E/250G4
德州儀器
- Lifecycle
- Active
- Stock
- 9269 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 | ADS7834E/250G4 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so nominal resolution is equivalent for substitutability. |
| Number of Input Channels | 8 (single-ended) / 4 (pseudo-differential) | 1 (single-ended) | The ADS7828 provides a multiplexed 8-channel input, while the ADS7834 is a single-channel device; this fundamentally changes system architecture. |
| Sampling Rate | 50 kSPS | 500 kSPS | The ADS7834 supports a much higher throughput, which matters for fast-changing or high-frequency signals. |
| Interface Type | I2C | SPI | Different serial interfaces require different host controller peripherals and firmware, affecting drop-in compatibility. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Both operate over the same supply range, so power supply design is compatible. |
| Input Type | Single-ended / pseudo-differential | Single-ended | Pseudo-differential inputs on the ADS7828 allow rejection of common-mode noise, which the single-ended ADS7834 cannot provide. |
| Package / Mounting | 16-TSSOP (surface mount) | 8-VSSOP (surface mount) | Different package footprints and pin counts prevent direct PCB drop-in replacement. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial environments. |
| Reference Type | External | External | Both require an external voltage reference, so reference circuitry design considerations are similar. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7828EIPWRQ1 | ADS7834E/250G4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 50k | 500k |
| 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, Internal |
| 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 ADS7834E/250G4?
The ADS7828EIPWRQ1 is an 8-channel, 12-bit SAR ADC with an I2C interface, housed in a TSSOP-16 package and qualified to AEC-Q100 Grade 1 for automotive applications. The ADS7834E/250G4 is a single-channel, 12-bit SAR ADC with a serial SPI interface, offered in an 8-pin VSSOP package and specified for the industrial temperature range of -40°C to +85°C.
Can the ADS7828EIPWRQ1 and ADS7834E/250G4 be used as direct substitutes for each other?
No. They are not pin-to-pin or function-to-function compatible. The ADS7828EIPWRQ1 provides 8 multiplexed input channels over I2C in a 16-pin package, while the ADS7834E/250G4 provides a single input channel over SPI in an 8-pin package. A redesign of the PCB, interface firmware, and channel architecture would be required.
How do the sampling rates of the ADS7828EIPWRQ1 and ADS7834E/250G4 compare?
The ADS7828EIPWRQ1 supports a throughput rate of up to 50 kSPS. The ADS7834E/250G4 supports a higher throughput rate of up to 500 kSPS, making it better suited for faster single-channel signal acquisition.
What are the supply voltage and reference requirements for each device?
The ADS7828EIPWRQ1 operates from a single 2.7 V to 5.5 V supply and can use either the supply voltage or an external reference on its VREF pin. The ADS7834E/250G4 operates from a 2.7 V to 5.25 V supply and requires an external reference voltage applied to its VREF pin.
What are the differences in digital interface and pin count between the two parts?
The ADS7828EIPWRQ1 uses an I2C-compatible two-wire serial interface and is packaged in a 16-pin TSSOP. The ADS7834E/250G4 uses an SPI-compatible serial interface and is packaged in an 8-pin VSSOP, resulting in different pin counts, footprints, and host-controller interface requirements.
How do the operating temperature ranges and qualification grades differ?
The ADS7828EIPWRQ1 is AEC-Q100 Grade 1 qualified with an ambient operating temperature range of -40°C to +125°C, targeting automotive systems. The ADS7834E/250G4 is specified for -40°C to +85°C and is intended for industrial-grade applications rather than automotive qualification.
Which device is more appropriate for multi-channel monitoring versus high-speed single-channel acquisition?
The ADS7828EIPWRQ1 is better suited for multi-channel monitoring because it integrates an 8-channel input multiplexer with I2C control, reducing host pin count. The ADS7834E/250G4 is better suited for high-speed single-channel acquisition because it offers up to 500 kSPS throughput on one channel with an SPI interface.