Part A
AD7811YRU
ADI公司
- Lifecycle
- Active
- Stock
- 7280 件
- Package
- TSSOP-16
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The AD7811YRU and AD7819YR are not drop-in replacements for each other. The AD7811YRU is a 4-channel, 10-bit ADC with a serial interface, while the AD7819YR is a single-channel, 8-bit ADC with a parallel interface. They differ in channel count, resolution, output interface, and package type, so substituting one for the other requires a full redesign of the surrounding circuitry and firmware.
Different channel count
Different resolution
Different output interface
Different package type
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7811YRU | AD7819YR | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 4 (single-ended) / 3 (pseudo-differential) | 1 (single-ended) | Determines how many analog signals can be digitized; a 4-channel part can replace a 1-channel part only if the extra channels are unused. |
| Resolution | 10 bits | 8 bits | Higher resolution provides finer quantization; an 8-bit device cannot match the measurement precision of a 10-bit device. |
| Sampling Rate | 350 kSPS | 200 kSPS | Maximum conversion throughput; a slower part may not keep up with the system's required sample rate. |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Both support the same wide supply range, so power-rail compatibility is maintained. |
| Interface Type | Serial (SPI/QSPI/MICROWIRE/DSP compatible) | Parallel (8-bit) | The digital interface must match the host controller; serial versus parallel is a fundamental incompatibility for direct substitution. |
| Package | 16-lead TSSOP | 16-lead SOIC | Footprint and board layout differ between TSSOP and SOIC, affecting physical drop-in compatibility. |
| Input Type | Single-ended / pseudo-differential | Single-ended | Pseudo-differential inputs allow rejection of common-mode noise; a single-ended-only part cannot replicate that capability. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +85 °C | The wider temperature range of the AD7811YRU supports harsher environments that the AD7819YR may not meet. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7811YRU | AD7819YR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
| Number of Bits | 10 | 8 |
| Sampling Rate(Per Second) | 350k | 200k |
| Data Interface | SPI, DSP | Parallel |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the AD7811YRU and AD7819YR?
The AD7811YRU is a 4-channel, 10-bit successive-approximation ADC with a serial interface, housed in a 16-lead TSSOP package. The AD7819YR is a single-channel, 8-bit successive-approximation ADC with a parallel interface, housed in a 16-lead SOIC package. They differ in resolution, channel count, interface type, and package.
Are the AD7811YRU and AD7819YR pin-compatible?
No. The AD7811YRU uses a 16-lead TSSOP package, while the AD7819YR uses a 16-lead SOIC package. The pin functions and PCB land patterns differ, so they are not drop-in replacements for each other.
What is the resolution of each device?
The AD7811YRU provides 10-bit resolution, while the AD7819YR provides 8-bit resolution. Designs requiring higher precision should account for this difference.
How do the digital interfaces of the AD7811YRU and AD7819YR differ?
The AD7811YRU uses a serial digital interface, whereas the AD7819YR uses a parallel digital interface. This affects the host microcontroller or DSP connection and the number of I/O lines required.
How many analog input channels does each device support?
The AD7811YRU supports 4 analog input channels, while the AD7819YR supports a single analog input channel. Multi-channel acquisition requirements favor the AD7811YRU.
Can the AD7811YRU and AD7819YR operate from the same supply voltage?
Both devices are specified for single-supply operation in the 2.7 V to 5.5 V range per their respective manufacturer datasheets. Verify the exact supply and reference conditions in the Analog Devices datasheets for each part before finalizing a design.
Which device is better suited for space-constrained designs?
The AD7811YRU in a 16-lead TSSOP typically occupies less PCB area than the AD7819YR in a 16-lead SOIC. Final selection should also account for the interface, channel count, and resolution requirements of the application.