Part A
ADUC834BSZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4126 Stückzahl
- Package
- MQFP-52
- Series
- Eingebettete Mikrocontroller
Replacement verdict
Compatible functional replacement candidate
The ADUC834BSZ and ADUC845BS62-3 are both MicroConverter 12-bit ADC with embedded 8051 MCU devices from Analog Devices, sharing the same core architecture, ADC resolution, and 52-pin MQFP package. However, they differ in on-chip memory density, DAC channel count, and specified operating temperature range, so the ADUC845BS62-3 can serve as a functional replacement candidate only after validating memory headroom, DAC requirements, and thermal conditions against the target design.
Package Type
High match
ADC Resolution
High match
On-Chip Memory Density
Validation required
DAC Channel Count
Validation required
Parts at a glance
Part B
ADUC845BS62-3
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 65 Stückzahl
- Package
- QFP-52
- Series
- Eingebettete Mikrocontroller
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADUC834BSZ | ADUC845BS62-3 | Why it matters |
|---|---|---|---|
| Core Architecture | 8052-compatible 8-bit MCU core | 8052-compatible 8-bit MCU core | Both share the same 8052 instruction set, so firmware toolchains and code are largely portable between the two parts. |
| Program Memory (Flash) | 62 kB on-chip Flash | 62 kB on-chip Flash | Identical code storage capacity means the same application image can fit in either device without resizing. |
| On-chip ADC Resolution | Dual 24-bit sigma-delta ADCs (primary + auxiliary) | Dual 24-bit sigma-delta ADCs (primary + auxiliary) | Matching high-resolution ADC architecture supports precision sensor measurement in either part. |
| ADC Input Channels | 3 differential / 6 pseudo-differential inputs | 4 differential / 8 pseudo-differential inputs | The ADUC845 offers more analog input channels, allowing more sensors to be connected without external multiplexing. |
| On-chip DAC | 12-bit voltage output DAC | 12-bit voltage output DAC | Both provide a single 12-bit DAC for analog output/control loops, so output-stage design is interchangeable. |
| RAM (Data Memory) | 2 kB on-chip SRAM | 2.25 kB on-chip SRAM | Slightly more SRAM on the ADUC845 gives extra headroom for buffers and stack in demanding applications. |
| Supply Voltage Range | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Identical supply range means the same power supply design and decoupling can be reused. |
| Package | 52-lead MQFP | 52-lead MQFP | Same package and pin count allow a common PCB footprint and mechanical layout. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching industrial temperature ratings make the parts interchangeable in the same environmental conditions. |
| UART / Serial Interface | On-chip UART plus SPI and I2C | On-chip UART plus SPI and I2C | Identical serial peripherals support the same communication interfaces and external device connections. |
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 | ADUC834BSZ | ADUC845BS62-3 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | MicroConverter® ADuC8xx | MicroConverter® ADuC8xx |
| Part Status | Active | Obsolete |
| Core Processor | 8052 | 8052 |
| Core Size | 8-Bit | 8-Bit |
| Speed | 12.58MHz | 12.58MHz |
| Connectivity | EBI/EMI, I²C, SPI, UART/USART | I²C, SPI, UART/USART |
| Peripherals | POR, PSM, PWM, Temp Sensor, WDT | POR, PSM, PWM, Temp Sensor, WDT |
| Number of I/O | 34 | 34 |
| Program Memory Size | 62KB (62K x 8) | 62KB (62K x 8) |
| Program Memory Type | FLASH | FLASH |
| EEPROM Size | 4K x 8 | 4K x 8 |
| RAM Size | 2.25K x 8 | 2.25K x 8 |
| Voltage - Supply (Vcc/Vdd) | 2.7V ~ 5.25V | 2.7V ~ 3.6V |
| Data Converters | A/D 3x16b, 4x24b; D/A 1x12b | A/D 10x24b; D/A 1x12b, 2x16b |
| Oscillator Type | Internal | Internal |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the core differences between the ADUC834BSZ and the ADUC845BS62-3?
The ADUC834BSZ is a MicroConverter 12-bit ADC with dual 16-bit/12-bit DACs, 62 kB flash, and an 8051 core in a 52-lead MQFP package. The ADUC845BS62-3 is a MicroConverter 24-bit ADC with 12-bit DACs, 62 kB flash, and an 8051 core in a 52-lead MQFP package. The primary differences are ADC resolution (12-bit vs 24-bit) and DAC resolution (dual 16-bit/12-bit vs 12-bit).
Are the ADUC834BSZ and ADUC845BS62-3 pin-compatible?
Both devices are offered in a 52-lead MQFP package, but pin compatibility cannot be assumed. Designers must verify pin functions and PCB land patterns against the respective manufacturer datasheets before considering a replacement.
What is the ADC resolution of each device?
The ADUC834BSZ integrates a 12-bit ADC, while the ADUC845BS62-3 integrates a 24-bit sigma-delta ADC. The higher resolution of the ADUC845BS62-3 suits precision measurement applications, whereas the ADUC834BSZ targets general-purpose control and monitoring.
How do the on-chip DAC specifications compare?
The ADUC834BSZ provides dual DACs configurable as 16-bit or 12-bit. The ADUC845BS62-3 provides 12-bit DACs. Applications requiring higher DAC resolution should favor the ADUC834BSZ.
Do both parts share the same 8051 core and flash memory size?
Yes. Both the ADUC834BSZ and ADUC845BS62-3 are built around an 8051-compatible core and include 62 kB of on-chip flash program memory, allowing similar code development environments.
Can the ADUC834BSZ be used as a drop-in replacement for the ADUC845BS62-3?
No. Despite sharing the 52-lead MQFP package and 8051 core, the differing ADC and DAC resolutions mean the devices are not functionally equivalent. A substitution requires full validation of analog performance, pin functions, and firmware against manufacturer documentation.
Which device is better suited for high-precision sensor measurement?
The ADUC845BS62-3 is better suited for high-precision sensor measurement because its 24-bit sigma-delta ADC offers significantly higher resolution than the 12-bit ADC of the ADUC834BSZ.