Part A
ADSP-BF547BBCZ-5A
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6462 PCS
- Series
- Embedded - DSP (Digital Signal Processors)
Replacement verdict
Not a drop-in replacement
The ADSP-BF547BBCZ-5A and ADSP-21990BBC are not drop-in replacements for one another. They differ in processor core architecture, instruction set, package and pinout, and peripheral integration, so a direct board-level substitution is not feasible without redesign and firmware rework.
Different processor core
Different instruction set
Different package and pinout
Different peripheral set
Parts at a glance
Part B
ADSP-21990BBC
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2351 PCS
- Package
- BGA-196
- Series
- Embedded - DSP (Digital Signal Processors)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADSP-BF547BBCZ-5A | ADSP-21990BBC | Why it matters |
|---|---|---|---|
| Processor Core | Blackfin (16/32-bit fixed-point DSP with MCU features) | ADSP-219x (16-bit fixed-point DSP) | The core architecture determines instruction set, toolchain, and code compatibility; different cores are not binary- or source-compatible without porting. |
| Maximum Core Clock Frequency | 500 MHz | 160 MHz | Clock speed directly affects processing throughput and real-time performance headroom for DSP algorithms. |
| On-Chip Program/Data Memory | Up to 132 KB on-chip SRAM (L1/L2 configuration) | Approximately 32K words on-chip RAM (program and data) | On-chip memory capacity constrains how much code and data can run without external memory, affecting cost and board complexity. |
| Package | 289-ball CSP-BGA | 196-ball CSP-BGA | Package footprint and ball count determine PCB layout, routing, and whether a drop-in replacement is physically possible. |
| Supply Voltage (Core) | 1.0 V to 1.5 V core (with separate I/O supply) | 2.5 V core (with 3.3 V I/O) | Core voltage affects power consumption and requires different power supply design; incompatible rails prevent direct substitution. |
| Operating Temperature Range | Industrial (-40°C to +85°C) | Industrial (-40°C to +85°C) | Temperature range must match the target application environment for reliable operation. |
| Integrated Peripherals | Ethernet MAC, USB, CAN, SPI, SPORT, UART, TWI, PPI, timers | SPORT, SPI, UART, timers, PWM, ADC interface | Peripheral set determines what external components and interfaces can be supported without glue logic; mismatches require redesign. |
| External Memory Interface | Yes (EBIU supporting SDRAM and asynchronous memory) | Yes (external memory interface for SRAM/Flash) | External memory support affects maximum system memory and the ability to run larger applications. |
| DMA Channels | Multiple DMA channels with descriptor-based transfers | Multiple DMA channels | DMA capability impacts data movement efficiency and CPU load in real-time signal processing. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADSP-BF547BBCZ-5A | ADSP-21990BBC |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | Blackfin® | ADSP-21xx |
| Part Status | Active | Obsolete |
| Type | Fixed Point | Fixed Point |
| Interface | SPI, SSP, TWI, UART, USB | SPI, SSP |
| Clock Rate | 533MHz | 150MHz |
| Non - Volatile Memory | External | External |
| On - Chip RAM | 260kB | 20kB |
| Voltage - I / O | 2.50V, 3.30V | 3.30V |
| Voltage - Core | 1.25V | 2.50V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | ADSP-BF547 | - |
| Packaging | Tray | - |
Frequently asked questions
What are the core architectural differences between the ADSP-BF547BBCZ-5A and the ADSP-21990BBC?
The ADSP-BF547BBCZ-5A is a Blackfin-series fixed-point DSP with a maximum core clock of 500 MHz, featuring an on-chip 32-bit MAC and dual 16-bit MACs, plus integrated peripherals such as Ethernet MAC, USB 2.0, and a parallel peripheral interface. The ADSP-21990BBC is a 16-bit fixed-point DSP from the ADSP-2199x family with a core clock of up to 160 MHz, offering a 16-bit MAC and peripherals including a PWM unit, ADC, and CAN controller. The two devices belong to different DSP families and are not architecturally compatible.
Are the ADSP-BF547BBCZ-5A and ADSP-21990BBC pin-to-pin or package compatible?
No. The ADSP-BF547BBCZ-5A is supplied in a 289-ball BGA package (CSP_BGA), while the ADSP-21990BBC is supplied in a 196-ball BGA package (CSP_BGA). The ball counts, ball maps, and package dimensions differ, so they are not pin-to-pin or footprint compatible and cannot be interchanged on the same PCB without redesign.
Can the ADSP-21990BBC be used as a direct drop-in replacement for the ADSP-BF547BBCZ-5A?
No. Beyond the package and pinout differences, the two devices use different instruction set architectures, memory maps, peripheral sets, and development toolchains. A direct drop-in replacement is not possible; any migration would require a hardware redesign and firmware porting validated against the respective manufacturer datasheets.
How do the on-chip memory resources of the two DSPs compare?
The ADSP-BF547BBCZ-5A integrates 132 KB of on-chip L1 SRAM (configurable as instruction and data memory) plus 64 KB of L1 scratchpad and 32 KB of L2 SRAM, along with an external memory controller supporting SDRAM, DDR, and asynchronous memories. The ADSP-21990BBC provides 32K words of on-chip program memory and 32K words of data memory (16-bit words), with external memory expansion via its external memory interface. The memory capacities and organizations are not equivalent.
What are the differences in peripheral integration relevant to industrial control applications?
The ADSP-21990BBC includes a dedicated PWM generation unit, an on-chip 12-bit ADC, and a CAN 2.0B controller, which are tailored for motor control and industrial drive applications. The ADSP-BF547BBCZ-5A instead integrates an Ethernet MAC, USB 2.0 OTG, a parallel peripheral interface (PPI), and multiple serial ports (SPORTs, SPI, UART, TWI), targeting networked embedded and multimedia applications. The peripheral sets are not interchangeable.
Do the two devices share the same development tools and software ecosystem?
No. The ADSP-BF547BBCZ-5A is supported by Analog Devices' CrossCore Embedded Studio and the Blackfin toolchain, while the ADSP-21990BBC is supported by the VisualDSP++ development environment for the ADSP-2199x family. The compilers, debuggers, and board support packages are family-specific, so code and projects are not portable between the two devices without significant rework.
What are the supply voltage and I/O interface differences between the ADSP-BF547BBCZ-5A and ADSP-21990BBC?
The ADSP-BF547BBCZ-5A operates from a 1.0 V to 1.5 V core supply (depending on speed grade) with 2.5 V or 3.3 V I/O, and its 500 MHz speed grade corresponds to the -5A suffix. The ADSP-21990BBC operates from a 2.5 V core supply with 3.3 V I/O. The differing core and I/O voltage requirements mean the power delivery and level-shifting networks are not compatible between the two designs.