Part A
AD7819YRZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6969 PCS
- Package
- SOIC-16
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The AD7819YRZ and AD7812YR are not drop-in replacements for each other. The AD7819YRZ is a single-channel 8-bit ADC in an SOIC-16 package, while the AD7812YR is an 8-channel 10-bit ADC in a narrower SOIC-16 body with a different pinout. Channel count, resolution, and pin configuration all differ, so a direct board swap is not possible without redesign.
Different channel count
Different resolution
Different pinout
Different package body width
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7819YRZ | AD7812YR | Why it matters |
|---|---|---|---|
| Resolution | 8-bit | 10-bit | Resolution determines the smallest analog voltage change the ADC can distinguish; a 10-bit part offers four times finer quantization than an 8-bit part, affecting measurement accuracy. |
| Number of ADC Inputs / Channels | 1 (single-ended) | 8 (single-ended, via multiplexer) | The channel count defines how many analog signals can be measured; a single-channel part cannot replace a multi-channel part in systems that need to sample several sensors. |
| Sampling Rate | 200 kSPS | 350 kSPS | Maximum throughput limits the highest signal frequency that can be digitized; a slower part may not keep up with faster acquisition requirements. |
| Interface Type | Parallel (8-bit) | Serial (SPI/QSPI/MICROWIRE/DSP-compatible) | The digital interface must match the host microcontroller or DSP; parallel and serial parts are not pin- or protocol-compatible, so substitution requires redesign. |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Supply range determines compatibility with the system power rail; both parts support the same 3 V and 5 V logic systems. |
| Package / Pin Count | 16-lead SOIC | 20-lead SOIC | Package and pin count affect PCB footprint and layout; different footprints prevent direct drop-in replacement. |
| Internal Reference | Yes (on-chip reference) | Yes (on-chip reference) | An internal reference simplifies design by removing an external reference component; both parts include one, easing analog front-end design. |
| Input Type | Single-ended | Single-ended (multiplexed) | Input configuration determines whether differential or ground-referenced signals can be measured; both are single-ended, but the AD7812 multiplexes multiple inputs. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range indicates suitability for industrial environments; identical ranges mean both are rated for the same operating conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7819YRZ | AD7812YR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 8 | 10 |
| Sampling Rate(Per Second) | 200k | 350k |
| Number of Inputs | 1 | 7, 8 |
| Input Type | Single Ended | Pseudo-Differential, Single Ended |
| Data Interface | Parallel | DSP |
| Configuration | S/H-ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External, Internal |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 105°C |
Frequently asked questions
What are the key differences between the AD7819YRZ and the AD7812YR?
The AD7819YRZ is a single-channel 8-bit analog-to-digital converter (ADC) with a parallel interface, housed in a 16-lead SOIC package. The AD7812YR is a 10-bit, 8-channel ADC with a serial (SPI/QSPI-compatible) interface, housed in a 20-lead SOIC package. They differ in resolution, channel count, interface type, and package pin count.
Can the AD7819YRZ and AD7812YR be used interchangeably in the same socket?
No. The AD7819YRZ is a 16-lead SOIC device with a parallel data bus, while the AD7812YR is a 20-lead SOIC device with a serial interface. The package footprint, pin count, and pin functions differ, so they are not drop-in replacements for each other.
What is the resolution of each device?
The AD7819YRZ provides 8-bit resolution. The AD7812YR provides 10-bit resolution, offering four times the quantization levels of the AD7819YRZ.
How many analog input channels does each ADC support?
The AD7819YRZ has a single analog input channel. The AD7812YR provides 8 analog input channels, making it suitable for multi-channel signal acquisition applications.
What interface types do the AD7819YRZ and AD7812YR use?
The AD7819YRZ uses a parallel microprocessor-compatible interface for data output. The AD7812YR uses a serial interface compatible with SPI and QSPI protocols, reducing the number of required I/O pins.
What are the package and pin count differences between the two parts?
The AD7819YRZ is supplied in a 16-lead SOIC package. The AD7812YR is supplied in a 20-lead SOIC package. The YRZ and YR suffixes indicate RoHS-compliant SOIC packaging per Analog Devices ordering conventions.
Which device is better suited for multi-channel data acquisition systems?
The AD7812YR is better suited for multi-channel acquisition because it integrates 8 analog input channels and a 10-bit ADC with a serial interface, reducing external multiplexing and pin count. The AD7819YRZ, with a single channel and 8-bit resolution, is intended for simpler single-channel conversion tasks.
Do both devices operate from a single 5 V supply?
Yes. Both the AD7819YRZ and AD7812YR are specified for operation from a single 5 V supply, consistent with their datasheet specifications as 5 V, 8-bit and 10-bit ADCs respectively.