Overview
The HSP45102SC- 33Z is a 12-bit numerically controlled oscillator (NCO) from Intersil (now Renesas Electronics) , belonging to the HSP45102 series of digital signal processing devices. This device employs a 32-bit frequency control resolution and a 12-bit sine wave output architecture, and can be used in applications such as direct digital frequency synthesis (DDS), digital modulation, PSK communication, low-cost digital radio, and function signal generation. Renesas’ current product page marks the HSP45102SC-33Z as obsolete (discontinued/not in production) , therefore, special attention should be paid to its availability and lifespan when purchasing and designing replacements.
The HSP45102SC-33Z supports clock frequencies up to 33MHz , employs an internal 32-bit phase accumulator, and converts phase information into 12-bit sine wave amplitude data via a sine wave ROM. Its worst-case frequency tuning resolution reaches approximately 0.009Hz (in the 40MHz version) , while also exhibiting a spurious-free dynamic range exceeding 69dB. The device also supports BFSK and QPSK modulation and provides serial frequency word loading functionality, meeting the signal generation requirements of traditional digital communication and frequency synthesis systems.
Core parameters
| Parameter | Value |
| Product Type | Numerically controlled oscillator (NCO) |
| series | HSP45102 |
| Manufacturer | Intersil / Renesas |
| Frequency control resolution | 32-bit |
| Output resolution | 12-bit |
| Output waveform | sine wave |
| Maximum clock frequency | 33MHz |
| Power supply voltage | 5V |
| Frequency tuning resolution | 0.009Hz (40MHz version specification) |
| Stray dynamic range | >69dB |
| Modulation method | BFSK, QPSK |
| Output format | Offset Binary |
| Packaging | 28-pin SOIC |
| Temperature range | 0°C to +70°C |
| Packaged version | Pb-Free |
| Product Status | Obsolete |
The 33MHz specification is the version identifier for the HSP45102SC-33Z ; a 40MHz version is also provided in the datasheet. The 0.009Hz tuning resolution is a typical product specification given for the HSP45102 at 40MHz and should not be interpreted as the actual output frequency of the SC-33Z at 33MHz.
Features
32-bit frequency control architecture
The HSP45102SC-33Z employs a 32-bit frequency control word and achieves digital frequency synthesis through the phase accumulation structure within the numerically controlled oscillator (NCO). Compared to simple fixed-frequency oscillators, the NCO can adjust the output frequency through digital control, making it ideal for systems requiring programmable frequency generation.
The device provides two frequency control words, and the currently used frequency control word is selected via a control pin. After the control word is switched, the new frequency can be switched within one clock cycle, while there is a fixed internal pipeline delay.
12-bit sine wave output
The HSP45102SC-33Z internally maps digital phase information into sinusoidal amplitude data through a phase accumulator and a Sine ROM, ultimately providing a 12-bit sine wave output .
The output uses an Offset Binary format, simplifying interface design with external DACs. For systems requiring further conversion of digital frequency synthesis results into analog signals, this digital output can be directly connected to a suitable data converter.
BFSK and QPSK modulation support
This device is not only used for simple digital frequency synthesis, but also supports modulation methods such as BFSK and QPSK . The device provides phase modulation input and uses a phase shift structure to control different phase states, where the phase can be shifted in 90° steps.
Therefore, the HSP45102SC-33Z can be used for modulation signal generation in traditional digital communication systems, and is not limited to function waveform generation.
Low spurious frequency output
The HSP45102 series features a spurious-free dynamic range exceeding 69 dB , with sinusoidal output spurious frequency components below −69 dBc as stated in the datasheet. For DDS, digital communications, and frequency synthesis applications, the lower spurious level contributes to improved spectral purity of the generated signal .
Static CMOS architecture
The device employs a fully static CMOS design and supports a serial frequency loading interface, allowing the frequency control word to be configured by external digital control logic. This architecture is suitable for system-level integration with digital controllers, communication processors, and other DSP peripherals.
Typical application scenarios
Direct Digital Frequency Synthesis (DDS)
The HSP45102SC-33Z can be used as the digital frequency generation core in a traditional DDS system. It generates programmable sine wave data based on an external control word, and then works with a DAC to complete the digital-to-analog signal conversion.
Digital communication equipment
The device supports BFSK and QPSK modulation and can be used to generate carrier or modulated signals in traditional digital wireless communication systems, making it suitable for low-cost digital radio and related communication equipment.
PSK communication
Phase-modulated signals can be generated through phase-offset input and digital phase accumulation structure, making it suitable for PSK-type communication systems and related experimental and testing equipment.
Satellite terminal
Renesas’ official documentation lists satellite terminals as one of the typical applications of the HSP45102, which can be used to build traditional communication signal processing links using its digital frequency synthesis and modulation functions.
Function signal generator
The device can generate digital sine wave data, and therefore can be combined with DACs, filters and control logic for use in traditional function signal generation devices and test instruments.
Comparative Advantage Analysis
| Performance indicators | HSP45102SC-33Z | Ordinary digital oscillation scheme |
| Frequency control | 32-bit digital control | Depending on the plan |
| Sine output | 12-bit | Depending on the plan |
| Modulation support | BFSK / QPSK | Additional logic is usually required. |
| Output format | Offset Binary | Depending on the plan |
| Frequency synthesis | support | Partial support |
| Stray properties | <−69dBc | Depends on the design |
| External DAC interface | Direct Digital Output | Additional design required |
| Packaging | 28-pin SOIC | Depending on the device |
The core advantage of the HSP45102SC-33Z lies in its integration of frequency control, phase accumulation, sine lookup table, and some modulation functions into a single device, reducing the amount of external digital logic required in traditional DDS signal generation schemes. This device offers significant compatibility with older communication equipment, test instruments, and digital signal generation systems that are still under maintenance .
Manufacturer Profile: Intersil / Renesas
The HSP45102 was originally part of Intersil’s digital signal processing device product line. After Intersil was acquired by Renesas Electronics, the product and related technical information are now supported by Renesas Electronics .
The HSP45102 series belongs to the earlier digital signal processing and frequency synthesis devices, targeting DDS, digital modulation, and communication signal generation applications. Renesas’ current website marks the HSP45102SC-33Z as Obsolete ; therefore, for new product design, selection should be made after confirming availability. For existing equipment repair and lifecycle maintenance , it is crucial to confirm the original model, electrical specifications, and package compatibility.
Why choose HSP45102SC-33Z?
●Employs a 32-bit frequency control architecture for high-resolution digital frequency synthesis.
● Provides 12-bit sine wave digital output.
● Supports BFSK and QPSK modulation
● Supports serial frequency control word loading.
● Features spurious frequency component specifications below −69dBc.
● Offset binary output format facilitates connection to external DACs.
● Suitable for DDS, digital communication, PSK, and function signal generation systems.
● 28-pin SOIC package for easy traditional PCB design and equipment maintenance.
It should be noted that the HSP45102SC-33Z has now been marked as Obsolete by Renesas , so its main value is more focused on the maintenance, replacement and lifecycle management of existing equipment, rather than being the preferred device for new platforms.
Frequently Asked Questions (FAQ)
Q1: What type of chip is HSP45102SC-33Z?
The HSP45102SC-33Z is a 12-bit digitally controlled oscillator (NCO) with a 32-bit frequency control architecture, suitable for digital frequency synthesis and modulation. Its main applications include DDS, BFSK, QPSK, and PSK communications.
Q2: What is the maximum operating frequency of the HSP45102SC-33Z?
The HSP45102SC-33Z is the 33MHz version of the HSP45102 series , corresponding to the -33 speed class in the datasheet. The HSP45102 series also offers a 40MHz version; therefore, the specific model should be determined based on the clock requirements of the original equipment.
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