Part A
AD9954YSVZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6073 Stückzahl
- Package
- TQFP-48
- Series
- Schnittstelle für digitale Synthese (DDS)
Replacement verdict
Compatible functional replacement candidate
The AD9957BSVZ and AD9954YSVZ are both 14-bit DDS devices in a 100-lead TQFP_EP package, but they are not drop-in replacements: the AD9957 integrates a 1 GSPS 14-bit DAC with quadrature upconversion for transmit applications, while the AD9954 provides a 400 MSPS 14-bit DAC with on-chip comparator and RAM-based modulation. The AD9957 offers a higher system clock rate and integrated upconversion, whereas the AD9954 offers lower power consumption and a simpler single-tone DDS architecture. Selection should be driven by the required output frequency range, upconversion needs, and power budget rather than pin compatibility.
Package Type
Validation required
DAC Resolution
Not compatible
Maximum System Clock
Not compatible
Output Architecture
Not compatible
Parts at a glance
Part B
AD9957BSVZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4659 Stückzahl
- Package
- TQFP-100
- Series
- Schnittstelle für digitale Synthese (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 | AD9957BSVZ | AD9954YSVZ | Why it matters |
|---|---|---|---|
| Primary Function | Quadrature digital upconverter (QDUC) with integrated 14-bit DAC | Direct digital synthesizer (DDS) with integrated 14-bit DAC | Defines the core signal-chain role; a DDS generates a single tone while a QDUC performs interpolation and quadrature upconversion, so they are not functionally interchangeable. |
| Maximum DAC Update / Sample Rate | 1 GSPS | 400 MSPS | Higher sample rate enables wider output bandwidth and higher-frequency synthesis, directly affecting achievable signal frequency and spectral performance. |
| DAC Resolution | 14-bit | 14-bit | DAC bit depth sets the quantization noise floor and achievable SFDR; identical resolution means comparable amplitude fidelity. |
| On-Chip DDS/DAC Channels | Single QDUC channel with 14-bit DAC | Single DDS channel with 14-bit DAC | Channel architecture determines whether quadrature upconversion and interpolation are available on-chip, which affects external component count and system complexity. |
| Maximum Output Frequency | Up to ~400 MHz (at 1 GSPS) | Up to ~160 MHz (at 400 MSPS) | Output frequency range determines which RF/IF bands can be synthesized directly without external mixing. |
| Package | 100-lead TQFP (TQFP-100) | 48-lead TQFP (TQFP-48) | Package footprint and pin count affect PCB layout, board space, and whether a drop-in replacement is physically possible. |
| Supply Voltage | 1.8 V core / 3.3 V I/O | 1.8 V core / 3.3 V I/O | Supply rails must match the host system's power architecture; identical rails simplify power design but do not guarantee pin compatibility. |
| Serial Control Interface | SPI-compatible serial port | SPI-compatible serial port | Control interface compatibility determines whether existing firmware and host connections can be reused. |
| Operating Temperature Range | -40 °C to +85 °C (industrial) | -40 °C to +85 °C (industrial) | Temperature range confirms suitability for industrial environments; matching ranges indicate comparable environmental robustness. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9954YSVZ | AD9957BSVZ |
|---|---|---|
| Part Status | Active | Active |
| Resolution(Bits) | 14 b | 14 b |
| Masterfclk | 400 MHz | 1 GHz |
| Tuning Word Width(Bits) | 32 b | 32 b |
| Voltage - Supply | 1.71V ~ 1.96V | 1.8V, 3.3V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary functional differences between the AD9957BSVZ and the AD9954YSVZ?
The AD9957BSVZ is a 1 GSPS quadrature digital upconverter with an integrated 14-bit DAC, designed for transmit signal processing in communications systems. The AD9954YSVZ is a 400 MSPS complete direct digital synthesizer (DDS) with a 14-bit DAC, intended for frequency synthesis applications. The AD9957 integrates interpolation filters and a quadrature modulator for upconversion, while the AD9954 provides a single-channel DDS output without integrated quadrature upconversion.
Are the AD9957BSVZ and AD9954YSVZ pin-to-pin compatible?
No. Both devices are offered in a 100-lead TQFP_EP package, but their pin functions and internal architectures differ. The AD9957 includes quadrature upconversion signal paths and associated pins that are not present on the AD9954. A direct drop-in replacement is not supported; the PCB layout and pin assignments must be validated against each device's datasheet.
What are the maximum DAC update rates for each device?
The AD9957BSVZ supports a maximum DAC update rate of 1 GSPS (1,000 MSPS). The AD9954YSVZ supports a maximum DAC update rate of 400 MSPS. These rates determine the maximum achievable output frequency and signal bandwidth for each device.
Do both devices include an integrated 14-bit DAC?
Yes. Both the AD9957BSVZ and the AD9954YSVZ integrate a 14-bit digital-to-analog converter on-chip. This integration reduces external component count and simplifies the analog output signal chain in both designs.
Which device is better suited for quadrature upconversion in a transmit signal chain?
The AD9957BSVZ is specifically designed for quadrature digital upconversion. It includes programmable interpolation filters, a quadrature modulator, and a 1 GSPS DAC, making it suitable for transmit signal processing in communications systems. The AD9954YSVZ is a single-channel DDS without an integrated quadrature modulator, so it is not intended for the same quadrature upconversion role.
What package type do the AD9957BSVZ and AD9954YSVZ use?
Both devices are supplied in a 100-lead TQFP_EP (thin quad flat package with exposed pad). The exposed pad provides thermal relief. Designers should confirm the exact package drawing and thermal land pattern from the respective manufacturer datasheets before layout.
Can the AD9954YSVZ be used as a substitute for the AD9957BSVZ in an existing design?
No, not as a direct substitute. The AD9954YSVZ lacks the integrated quadrature upconversion path and has a lower maximum DAC update rate (400 MSPS versus 1 GSPS). Substitution would require redesign of the signal chain, clocking, and PCB layout, and must be validated against the target system requirements using manufacturer documentation.