Part A
AD7811YRU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7280 PCS
- Package
- TSSOP-16
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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
Parts at a glance
Part B
AD7819YR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9406 PCS
- Package
- SOIC-16
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | 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.