Part A
ADUC812BS
Аналоговые устройства
- Lifecycle
- Active
- Stock
- 2004 ПКС
- Series
- Встроенные - микроконтроллеры
Replacement verdict
Compatible functional replacement candidate
The ADUC848BSZ62-5 and ADUC812BS are both MicroConverter 8051-core precision analog microcontrollers from Analog Devices, sharing a common architecture and 5 V operation, but they differ in on-chip memory density, analog front-end resolution, and package footprint. The ADUC848BSZ62-5 offers higher flash and SRAM capacity with a higher-resolution ADC, while the ADUC812BS shares the same core and interface philosophy. Functional substitution is feasible for many designs, but memory mapping, ADC resolution, and package layout must be validated against the target application before committing to a drop-in replacement.
Core Architecture
Validation required
On-Chip Memory
Validation required
ADC Resolution
Validation required
Package Type
Validation required
Parts at a glance
Part B
ADUC848BSZ62-5
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1308 ПКС
- Package
- QFP-52
- Series
- Встроенные - микроконтроллеры
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADUC848BSZ62-5 | ADUC812BS | Why it matters |
|---|---|---|---|
| Core Architecture | 8052 (8-bit) | 8052 (8-bit) | Both use the same 8052 core, so instruction set and toolchain compatibility are preserved. |
| Program Memory (Flash) | 62 kB | 8 kB | Larger on-chip flash allows more complex firmware without external memory; a major functional difference. |
| Data Memory (SRAM) | 2.3 kB | 256 B | More SRAM supports larger buffers and stack; affects firmware capability and substitutability. |
| ADC Resolution | 16-bit (sigma-delta) | 12-bit (SAR) | Higher resolution ADC enables precision measurement applications not achievable with the 12-bit SAR converter. |
| Number of ADC Channels | 10 | 8 | Channel count determines how many analog signals can be sampled directly. |
| DAC Channels | 2 (12-bit) | 2 (12-bit) | Both provide dual 12-bit DACs, so analog output capability is equivalent. |
| Supply Voltage | 5 V | 5 V | Same supply voltage means power supply design can be reused. |
| Package | 52-lead MQFP | 52-lead MQFP | Identical package allows drop-in PCB footprint compatibility. |
| UART/Serial Interfaces | 1 UART, SPI, I2C | 1 UART, SPI, I2C | Matching serial interfaces preserve communication architecture compatibility. |
| Operating Temperature Range | -40 to +85 °C | -40 to +85 °C | Same industrial temperature range supports equivalent environmental deployment. |
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 | ADUC812BS | ADUC848BSZ62-5 |
|---|---|---|
| Brand | Analog Devices | - |
| Product Type | 8-bit Microcontrollers - MCU | - |
| Subcategory | Microcontrollers - MCU | - |
| Minimum Operating Temperature | - 40 C | - |
| Maximum Operating Temperature | + 85 C | - |
| Core | 8052 | - |
| Program Memory Size | 8 kB | 62KB (62K x 8) |
| Data RAM Size | 256 B | - |
| ADC Resolution | 12 bit | - |
| Number of I/O | 34 I/O | 34 |
| Supply Voltage - Min | 2.7 V, 4.5 V | - |
| Supply Voltage - Max | 3.3 V, 5.5 V | - |
| Mounting Type | SMD/SMT | Surface Mount |
| Data Bus Width | 8 bit | - |
| Series | ADUC812 | MicroConverter® ADuC8xx |
| Interface Type | SPI, UART | - |
| Number of ADC Channels | 8 Channel | - |
| Number of Timers / Counters | 3 Timer | - |
| Program Memory Type | Flash | FLASH |
| Data RAM Type | SRAM | - |
| Product | MCUs | - |
| DAC Resolution | 12 bit | - |
| Watchdog Timers | Watchdog Timer | - |
| Processor Series | ADUC812 | - |
| Development Kit | EVAL-ADuC812QSZ | - |
| Part Status | - | Active |
| Core Processor | - | 8052 |
| Core Size | - | 8-Bit |
| Speed | - | 12.58MHz |
| Connectivity | - | I²C, SPI, UART/USART |
| Peripherals | - | POR, PSM, PWM, Temp Sensor, WDT |
| EEPROM Size | - | 4K x 8 |
| RAM Size | - | 2.25K x 8 |
| Voltage - Supply (Vcc/Vdd) | - | 4.75V ~ 5.25V |
| Data Converters | - | A/D 10x16b; D/A 1x12b, 2x16b |
| Oscillator Type | - | Internal |
| Operating Temperature | - | -40°C ~ 125°C (TA) |
Frequently asked questions
What are the key differences between the ADUC848BSZ62-5 and the ADUC812BS?
The ADUC848BSZ62-5 is a MicroConverter with a 62 kB Flash program memory, 4 kB Flash data memory, and 2 kB SRAM, while the ADUC812BS integrates 8 kB Flash program memory and 640 bytes of on-chip SRAM. The ADUC848BSZ62-5 operates from a 5 V supply and includes a 12-bit ADC with up to 10 channels, whereas the ADUC812BS offers a 12-bit ADC with 8 channels and operates from a 3 V or 5 V supply depending on the model variant.
Are the ADUC848BSZ62-5 and ADUC812BS pin-compatible?
No. The ADUC848BSZ62-5 is supplied in a 52-lead MQFP package, while the ADUC812BS is supplied in a 56-lead LFCSP package. The different package types, lead counts, and pin assignments prevent direct pin-to-pin substitution without a PCB redesign.
Can the ADUC848BSZ62-5 be used as a drop-in replacement for the ADUC812BS?
No. Beyond package and pinout differences, the two devices differ in Flash program memory size (62 kB vs 8 kB), SRAM capacity (2 kB vs 640 bytes), and peripheral configuration. A drop-in replacement is not possible; the design must be revalidated against the ADUC848BSZ62-5 datasheet.
What are the operating supply voltage ranges for these two MicroConverters?
The ADUC848BSZ62-5 is specified for operation from a 4.75 V to 5.25 V supply. The ADUC812BS is available in versions specified for 3 V and 5 V operation, with the 5 V version operating over 4.75 V to 5.25 V and the 3 V version over 2.7 V to 3.6 V, per the respective manufacturer datasheets.
How do the on-chip ADC specifications compare between the ADUC848BSZ62-5 and ADUC812BS?
Both devices integrate a 12-bit successive-approximation ADC. The ADUC848BSZ62-5 provides up to 10 single-ended or 5 differential input channels, while the ADUC812BS provides 8 single-ended or 4 differential input channels. Both include on-chip programmable gain amplifiers, but the exact gain ranges and throughput specifications should be confirmed in each device's datasheet.
Do both devices include an on-chip temperature sensor and voltage reference?
Yes. Both the ADUC848BSZ62-5 and the ADUC812BS integrate an on-chip temperature sensor and an on-chip voltage reference, as documented in their respective Analog Devices datasheets. The accuracy and drift specifications of these references differ and should be verified per device.
What communication interfaces are available on each device?
The ADUC848BSZ62-5 includes UART, SPI, and I2C serial interfaces. The ADUC812BS includes UART and SPI interfaces. Designers requiring I2C on the ADUC812BS must implement it in software or use an external peripheral, whereas the ADUC848BSZ62-5 provides it on-chip.
Which device offers more on-chip Flash program memory for application code?
The ADUC848BSZ62-5 offers 62 kB of Flash program memory, substantially more than the 8 kB of Flash program memory on the ADUC812BS. The ADUC848BSZ62-5 also provides 4 kB of Flash data memory, which the ADUC812BS does not offer.