Part A
ADS7841E
德州儀器
- Lifecycle
- Active
- Stock
- 5990 件
- Package
- SSOP-16
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADS7841E and ADS7863IDBQG4 are not drop-in replacements for one another. The ADS7841E is a single-channel 12-bit SAR ADC in a 16-pin SSOP package, while the ADS7863IDBQG4 is a dual-channel 12-bit SAR ADC in a 24-pin TSSOP package with a different serial interface and reference architecture. Designers must account for differences in channel count, package footprint, interface timing, and reference configuration before considering any substitution.
Different channel count
Different package footprint
Different interface timing
Different reference architecture
Parts at a glance
Part B
ADS7863IDBQG4
德州儀器
- Lifecycle
- Active
- Stock
- 8727 件
- Package
- SSOP-24
- 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 | ADS7841E | ADS7863IDBQG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 12 | 12 | Both are 12-bit ADCs, so nominal resolution is equivalent for substitutability. |
| Number of ADC channels | 4 single-ended / 2 differential | 4 single-ended / 2 differential (dual simultaneous) | Channel count and configuration determine how many signals can be sampled and whether simultaneous sampling is possible. |
| Sampling rate (max) | 200 kSPS | 2 MSPS | Maximum throughput affects the ability to capture fast-changing signals; the ADS7863 is significantly faster. |
| Interface type | SPI (serial) | SPI (serial) | Both use a serial SPI-compatible interface, easing digital-side substitution. |
| Supply voltage (analog) | 2.7 V to 5.25 V | 5 V (4.75 V to 5.25 V) | The ADS7841 supports a wider low-voltage range, while the ADS7863 requires a 5 V analog supply. |
| Package | 16-pin SSOP | 24-pin TSSOP (DBQ) | Different package footprints and pin counts prevent direct drop-in board replacement. |
| Input type | Single-ended / pseudo-differential | Fully differential | Input topology affects signal conditioning requirements and noise performance in the application. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +125 °C | The wider temperature range of the ADS7863 suits harsher environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7841E | ADS7863IDBQG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | - | 12 |
| Sampling Rate(Per Second) | - | 2M |
| Number of Inputs | - | 4, 6 |
| Input Type | - | Differential, Pseudo-Differential |
| Data Interface | - | SPI |
| Configuration | - | MUX-S/H-ADC |
| Ratio - S / H: ADC | - | 1:1 |
| Number of A/D Converters | - | 2 |
| Architecture | - | SAR |
| Reference Type | - | External, Internal |
| Voltage - Supply, Analog | - | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | - | 2.7V ~ 5.5V |
| Features | - | Simultaneous Sampling |
| Operating Temperature | - | -40°C ~ 125°C |
Frequently asked questions
What are the key architectural differences between the ADS7841E and ADS7863IDBQG4?
The ADS7841E is a 12-bit, 4-channel successive-approximation register (SAR) analog-to-digital converter with a serial interface, typically offered in a 16-pin SSOP package. The ADS7863IDBQG4 is a 12-bit, 4-channel, 2-MSPS simultaneous-sampling SAR ADC with two independent track-and-hold circuits, a flexible serial interface, and is supplied in a 24-pin TSSOP (DBQ) package. The ADS7863IDBQG4 is designed for simultaneous sampling of two channels, whereas the ADS7841E uses a single track-and-hold with multiplexed inputs.
Are the ADS7841E and ADS7863IDBQG4 pin-to-pin compatible?
No. The ADS7841E is packaged in a 16-pin SSOP, while the ADS7863IDBQG4 uses a 24-pin TSSOP (DBQ). The pin counts, pin functions, and package footprints differ, so they are not direct drop-in replacements and require different PCB land patterns.
How do the sampling architectures of the ADS7841E and ADS7863IDBQG4 differ?
The ADS7841E employs a single successive-approximation register architecture with a multiplexed 4-channel input and one track-and-hold circuit, so channels are converted sequentially. The ADS7863IDBQG4 features two independent track-and-hold circuits that allow simultaneous sampling of two input channels, followed by SAR conversion, which preserves phase relationships between simultaneously sampled signals.
What are the specified resolution and supply voltage ranges for these two ADCs?
Both devices are 12-bit SAR ADCs. The ADS7841E operates from a single supply in the range of 2.7 V to 5.25 V. The ADS7863IDBQG4 operates from a 5 V analog supply (4.75 V to 5.25 V) with a separate digital supply range of 2.7 V to 5.25 V, per the manufacturer datasheet.
Which device is better suited for simultaneous multi-channel sampling applications?
The ADS7863IDBQG4 is better suited for simultaneous sampling because it integrates two independent track-and-hold circuits that sample two channels at the same instant. The ADS7841E, with its single multiplexed track-and-hold, samples channels sequentially and is therefore not intended for applications requiring simultaneous sampling.
Do the ADS7841E and ADS7863IDBQG4 use the same serial interface?
No. The ADS7841E provides a standard SPI-compatible serial interface for control and data output. The ADS7863IDBQG4 offers a flexible serial interface that supports both SPI-compatible and other modes, with separate data outputs and a dedicated conversion-start/busy signaling scheme. The interface timing and control word formats differ between the two devices.
Can the ADS7841E be replaced by the ADS7863IDBQG4 in an existing design without changes?
No. Because the two devices differ in package (16-pin SSOP vs 24-pin TSSOP), pinout, sampling architecture, supply requirements, and serial interface protocol, a direct replacement is not possible. Any substitution requires a redesign of the PCB layout, review of the digital interface timing, and validation against the target system requirements using the respective manufacturer datasheets.