Part A
ADUC834BSZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4126 ПКС
- Package
- MQFP-52
- Series
- Встроенные - микроконтроллеры
Replacement verdict
Compatible functional replacement candidate
The ADUC834BSZ and ADUC847BS32-5 are both single-cycle 8051-core precision analog microcontrollers with integrated 24-bit sigma-delta ADCs, sharing a common architecture and 52-pin MQFP footprint, making them a viable functional replacement candidate. However, differences in on-chip memory density, ADC channel count, and specified operating temperature range require validation against the target application before substitution.
Package Type
High match
Flash Memory Density
Validation required
ADC Channel Count
Validation required
Operating Temperature Range
Validation required
Parts at a glance
Part B
ADUC847BS32-5
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7659 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 | ADUC834BSZ | ADUC847BS32-5 | Why it matters |
|---|---|---|---|
| Core Architecture | 8051-compatible 8-bit MCU core | 8051-compatible 8-bit MCU core | Both use the same 8051 core family, so instruction set and toolchain compatibility are preserved for firmware migration. |
| Program Memory (Flash) | 64 kB Flash | 32 kB Flash | Program memory size determines whether existing firmware fits; the ADUC834 offers twice the code space of the ADUC847. |
| Data Memory (RAM) | 2 kB RAM | 2 kB RAM | RAM capacity affects runtime data buffering and stack depth; identical RAM eases porting of application code. |
| ADC Resolution | 24-bit sigma-delta ADC | 24-bit sigma-delta ADC | Both provide high-resolution 24-bit conversion suitable for precision sensor and measurement applications. |
| Number of ADC Channels | 3 differential / 6 single-ended | 5 differential / 10 single-ended | Channel count determines how many analog signals can be measured; the ADUC847 supports more inputs for multi-sensor designs. |
| DAC Outputs | 2 x 12-bit DACs | 2 x 12-bit DACs | On-chip DACs enable analog control loops and setpoint generation without external components; both provide dual 12-bit outputs. |
| Supply Voltage | 2.7 V to 3.6 V | 4.75 V to 5.25 V | Operating voltage range must match the system power rail; the ADUC834 is 3 V-class while the ADUC847 is 5 V-class, affecting level compatibility. |
| Package | 52-lead MQFP | 32-lead LFCSP | Package footprint and pin count affect PCB layout and rework; the two parts are not drop-in compatible physically. |
| UART / Serial Interface | 1 x UART, SPI, I2C | 1 x UART, SPI, I2C | Serial peripherals determine communication options with host systems and sensors; both offer the same standard interfaces. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Industrial temperature range suitability is identical, so environmental constraints do not differentiate the two parts. |
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 | ADUC847BS32-5 |
|---|---|---|
| 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) | 32KB (32K 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 | 4.75V ~ 5.25V |
| 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 architectural differences between the ADUC834BSZ and the ADUC847BS32-5?
The ADUC834BSZ is a MicroConverter integrating a 24-bit sigma-delta ADC with a 12-bit DAC and an 8051-core MCU, offering 4 KB of flash memory. The ADUC847BS32-5 is a MicroConverter with dual 24-bit sigma-delta ADCs, no DAC, and 32 KB of flash memory, operating at 5 V. The ADUC834BSZ is positioned for applications requiring both precision ADC and DAC functions, while the ADUC847BS32-5 targets dual-channel precision measurement applications.
Are the ADUC834BSZ and ADUC847BS32-5 pin-compatible?
No. The ADUC834BSZ is supplied in a 52-lead MQFP package, while the ADUC847BS32-5 is supplied in a 52-lead MQFP package as well, but the pin functions differ because the ADUC847BS32-5 provides dual ADCs and no DAC, whereas the ADUC834BSZ includes a DAC and single ADC. Pin assignments and peripheral functions are not interchangeable, so direct PCB substitution is not supported without design changes.
How do the ADC specifications compare between the two devices?
The ADUC834BSZ integrates one 24-bit sigma-delta ADC. The ADUC847BS32-5 integrates two independent 24-bit sigma-delta ADCs, enabling simultaneous dual-channel precision measurement. Both devices target low-frequency, high-resolution signal acquisition, but the ADUC847BS32-5 offers an additional ADC channel for applications requiring two measurement paths.
What are the flash memory and operating voltage differences?
The ADUC834BSZ provides 4 KB of on-chip flash memory, while the ADUC847BS32-5 provides 32 KB of flash memory. The ADUC847BS32-5 operates from a 5 V supply, whereas the ADUC834BSZ operates from a 3 V or 5 V supply depending on the specific model variant. Designers must confirm the exact supply voltage and memory requirements against the target application.
Can the ADUC834BSZ be replaced by the ADUC847BS32-5 in an existing design?
Not as a drop-in replacement. Although both are 8051-core MicroConverters in 52-lead MQFP packages, the ADUC847BS32-5 lacks the 12-bit DAC present on the ADUC834BSZ, provides dual ADCs instead of one, has different flash memory size, and operates at 5 V. Firmware, pin assignments, and external circuitry would require revalidation against the ADUC847BS32-5 datasheet before any substitution.
Which device is better suited for applications requiring a DAC output?
The ADUC834BSZ is the appropriate choice when an integrated 12-bit DAC output is required, since it includes a 12-bit DAC on-chip. The ADUC847BS32-5 does not integrate a DAC, so applications needing analog output should select the ADUC834BSZ or add an external DAC to the ADUC847BS32-5 design.
Do both devices share the same 8051-compatible core and development toolchain?
Yes. Both the ADUC834BSZ and ADUC847BS32-5 are built around an 8051-compatible microcontroller core and are supported by Analog Devices' MicroConverter development tools. However, because peripheral sets, memory sizes, and register maps differ, firmware must be reviewed and adapted for the specific device before reuse.