Part A
AD9957BSVZ
ADI公司
- Lifecycle
- Active
- Stock
- 4659 件
- Package
- TQFP-100
- Series
- 介面-直接數位合成（DDS）
Replacement verdict
Not a drop-in replacement
The AD9951YSVZ and AD9957BSVZ are not drop-in replacements for one another. Although both are single-channel DDS devices in a 48-lead TQFP_EP package, they differ fundamentally in integrated DAC resolution, maximum system clock, and on-chip functionality, so the AD9957BSVZ cannot be substituted for the AD9951YSVZ without a full board and firmware redesign.
Different DAC resolution
Different maximum clock rate
Different integrated functionality
Different supply and I/O configuration
Parts at a glance
Part B
AD9951YSVZ
ADI公司
- Lifecycle
- Active
- Stock
- 4755 件
- Package
- TQFP-48
- Series
- 介面-直接數位合成（DDS）
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9951YSVZ | AD9957BSVZ | Why it matters |
|---|---|---|---|
| Primary Function | Direct Digital Synthesizer (DDS) with 14-bit DAC | Quadrature Digital Upconverter (QDUC) with 14-bit DAC | Defines the core signal-processing role; a DDS generates a single tone, while a QDUC performs interpolation and quadrature upconversion, so they are not functionally interchangeable. |
| Maximum DAC Update Rate / System Clock | 400 MSPS | 1 GSPS | Higher clock rates enable wider output bandwidth and higher-frequency synthesis; the 1 GSPS device supports applications the 400 MSPS device cannot. |
| DAC Resolution | 14 bits | 14 bits | DAC bit depth sets the achievable spurious-free dynamic range and output signal quality. |
| On-Chip Input/Output Data Path | DDS phase/amplitude control with serial I/O | 18-bit I/Q parallel input with interpolation filters | Determines how baseband data is fed to the device; the QDUC accepts I/Q samples for upconversion, whereas the DDS is programmed via registers for tone generation. |
| Package | 48-lead TQFP (SV) | 100-lead TQFP (SV) | Different footprint and pin count affect PCB layout and preclude direct drop-in replacement. |
| Supply Voltage | 1.8 V core / 3.3 V I/O | 1.8 V core / 3.3 V I/O | Confirms power-rail compatibility for board-level integration. |
| Integrated PLL | Yes (on-chip REFCLK multiplier) | Yes (on-chip PLL with REFCLK multiplier) | An integrated PLL allows generation of the high internal clock from a lower-frequency reference, simplifying system clocking. |
| Typical Application | Frequency synthesis, agile LO, test equipment | Cellular base stations, broadband wireless, digital upconversion | Indicates the intended use case; substituting one for the other requires re-architecting the signal chain. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9957BSVZ | AD9951YSVZ |
|---|---|---|
| Part Status | Active | Active |
| Resolution(Bits) | 14 b | 14 b |
| Masterfclk | 1 GHz | 400 MHz |
| Tuning Word Width(Bits) | 32 b | 32 b |
| Voltage - Supply | 1.8V, 3.3V | 1.71V ~ 1.96V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 105°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary functional differences between the AD9951YSVZ and AD9957BSVZ?
The AD9951YSVZ is a 400 MSPS, 14-bit direct digital synthesizer (DDS) with an integrated 14-bit DAC, designed for frequency synthesis and modulation. The AD9957BSVZ is a 1 GSPS, 14-bit quadrature digital upconverter (QDUC) that integrates a 14-bit DAC, an interpolation filter, and a digital quadrature modulator, intended for upconversion and transmit signal processing in communications systems.
Are the AD9951YSVZ and AD9957BSVZ pin-to-pin or package compatible?
No. Both devices are offered in a 48-lead TQFP_EP (exposed pad) package, but their pin functions and internal architectures differ significantly. The AD9951YSVZ is a DDS with DAC outputs, while the AD9957BSVZ is a QDUC with quadrature modulator and DAC output. They are not pin-to-pin compatible and cannot be interchanged without redesigning the PCB and validating the signal chain.
What are the maximum DAC update rates and resolution for each device?
The AD9951YSVZ provides a 14-bit DAC with a maximum DAC update rate of 400 MSPS. The AD9957BSVZ provides a 14-bit DAC with a maximum DAC update rate of 1 GSPS. Both resolutions are 14 bits, but the AD9957BSVZ supports a higher maximum update rate for wider bandwidth upconversion applications.
Which device is better suited for quadrature modulation and upconversion in a transmit chain?
The AD9957BSVZ is specifically designed as a quadrature digital upconverter with integrated interpolation filters and a digital quadrature modulator, making it suitable for transmit upconversion in communications systems. The AD9951YSVZ is a DDS without an integrated quadrature modulator, so it is typically used for frequency synthesis and modulation where a separate quadrature upconversion stage would be required.
Do both devices support serial control interface configuration?
Yes. Both the AD9951YSVZ and AD9957BSVZ include a serial control port for register configuration and programming. The serial interface allows the host processor to set frequency, phase, amplitude, and other operating parameters. Designers should consult the respective datasheets for the exact serial timing and register map differences.
What are the typical power supply requirements for the AD9951YSVZ and AD9957BSVZ?
Both devices operate from a 1.8 V digital core supply and a 3.3 V supply for the DAC and I/O, as specified in their datasheets. The AD9957BSVZ, with its higher 1 GSPS DAC update rate and additional digital upconversion circuitry, typically consumes more power than the AD9951YSVZ. Exact current and power figures should be verified from the manufacturer datasheets for the specific operating conditions.
Can the AD9951YSVZ be used as a drop-in replacement for the AD9957BSVZ in an existing design?
No. The AD9951YSVZ and AD9957BSVZ have different internal architectures, pin functions, and maximum operating speeds. The AD9951YSVZ lacks the integrated quadrature modulator and interpolation filters of the AD9957BSVZ, and its maximum DAC update rate is 400 MSPS versus 1 GSPS. A direct drop-in replacement is not possible; any substitution requires a full design review and validation against the target application requirements.