Part A
AD9954YSVZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6073 PCS
- Package
- TQFP-48
- Series
- Interface - Direct Digital Synthesis (DDS)
Replacement verdict
Compatible functional replacement candidate
The AD9952YSVZ and AD9954YSVZ are both single-channel direct digital synthesizers from the AD995x family in a 48-lead TQFP package, sharing core DDS architecture and supply requirements. The AD9954YSVZ adds an on-chip 1024-word × 32-bit RAM and extended frequency tuning word resolution, so it can serve as a functional upgrade in many designs, but the added RAM features and register-map differences require firmware validation before substitution.
Package Type
High match
Supply Voltage
High match
Frequency Resolution
Validation required
On-Chip RAM
Validation required
Parts at a glance
Part B
AD9952YSVZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7665 PCS
- Package
- TQFP-48
- Series
- Interface - Direct Digital Synthesis (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 | AD9952YSVZ | AD9954YSVZ | Why it matters |
|---|---|---|---|
| DAC Resolution | 14 bit | 14 bit | Both devices share the same DAC resolution, so spectral purity and amplitude quantization are equivalent. |
| Maximum DAC Update Rate | 400 MSPS | 400 MSPS | Identical update rate means the same maximum output frequency and Nyquist limit apply to both parts. |
| On-Chip Comparator | Yes (integrated comparator) | No | The AD9952 includes a comparator for square-wave/clock generation, which the AD9954 lacks, affecting applications needing a digital output. |
| On-Chip RAM | No | Yes (1024 x 32-bit) | The AD9954's RAM enables modulation and frequency/phase sweep profiles without continuous host intervention. |
| Phase Noise / SFDR Performance | Similar core, no RAM-based modulation | Similar core, RAM-based modulation supported | Both use the same DDS core, but the AD9954's RAM allows complex modulation that can affect dynamic performance in system use. |
| Package | 48-lead TQFP | 48-lead TQFP | Identical package and pin count simplify PCB layout and potential drop-in substitution. |
| Supply Voltage | 1.8 V core / 3.3 V I/O | 1.8 V core / 3.3 V I/O | Same supply requirements mean the same power design and level shifting can be reused. |
| Serial Interface | SPI-compatible serial I/O | SPI-compatible serial I/O | Both support the same serial control interface, so firmware and host communication are largely compatible. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9954YSVZ | AD9952YSVZ |
|---|---|---|
| Part Status | Active | Active |
| Resolution(Bits) | 14 b | 14 b |
| Masterfclk | 400 MHz | 400 MHz |
| Tuning Word Width(Bits) | 32 b | 32 b |
| Voltage - Supply | 1.71V ~ 1.96V | 1.71V ~ 1.96V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD9952YSVZ and AD9954YSVZ DDS ICs?
Both are direct digital synthesizers (DDS) from Analog Devices in a 48-lead TQFP_EP (SV) package. The AD9952 integrates a 14-bit DAC and supports DAC update rates up to 400 MSPS, while the AD9954 integrates a 14-bit DAC and supports DAC update rates up to 400 MSPS but adds an on-chip 1024-word × 32-bit RAM for linear sweep, frequency, phase, and amplitude modulation profiles. The AD9954 also provides a programmable 4× to 20× REFCLK multiplier and on-chip comparator, whereas the AD9952 offers a 4× to 20× multiplier as well but lacks the RAM-based modulation engine. Designers should confirm exact feature sets against the respective Analog Devices datasheets.
Are the AD9952YSVZ and AD9954YSVZ pin-compatible?
Both devices are offered in the same 48-lead TQFP_EP (SV) package, and Analog Devices documents them as pin-compatible within the same package option, allowing a common PCB footprint. However, because the AD9954 exposes additional RAM-related control and I/O functions, designers must verify that every pin function used in the target design matches the specific datasheet pin descriptions before substituting one device for the other.
What is the maximum DAC update rate for each device?
Per Analog Devices datasheets, both the AD9952 and AD9954 support a maximum DAC update rate of 400 MSPS. The internal system clock can be multiplied via the on-chip REFCLK multiplier (4× to 20×) from a lower-frequency reference, and the maximum SYSCLK is 400 MHz for both parts.
How do the on-chip RAM and modulation capabilities differ?
The AD9954 includes a 1024-word × 32-bit RAM that enables programmable frequency, phase, and amplitude sweep/modulation profiles, plus a RAM overlay feature for dynamic profile switching. The AD9952 does not include this RAM; modulation is limited to the standard frequency, phase, and amplitude registers. Designs requiring linear sweep or profile-based modulation should select the AD9954.
Do both parts support the same serial control interface?
Yes. Both the AD9952 and AD9954 provide a serial I/O port supporting SPI-compatible communication for register programming, with the same serial control pin functions (SCLK, SDIO, CS, and I/O update). The AD9954 additionally uses the serial port to load the on-chip RAM profile registers, so firmware must account for the extra RAM-related register map when migrating from the AD9952 to the AD9954.
What are the power supply and power consumption considerations for these devices?
Both devices operate from a 1.8 V digital core supply and a 3.3 V analog/DAC supply, as specified in the Analog Devices datasheets. The AD9954 typically consumes somewhat more power than the AD9952 due to the additional RAM and modulation circuitry; exact typical and maximum power figures should be taken from the respective datasheet power specifications for the intended operating conditions.
Can the AD9952YSVZ be used as a drop-in replacement for the AD9954YSVZ in an existing design?
Not unconditionally. Although both share the 48-lead TQFP_EP package and much of the register map, the AD9954 provides the on-chip RAM and associated modulation features that the AD9952 lacks. A design that relies on RAM sweep/modulation, RAM overlay, or the AD9954-specific register set will not function correctly with the AD9952. Replacement is only appropriate after confirming that the target design uses no AD9954-only features and that all pin and register differences are validated against both datasheets.
Which device is better suited for frequency sweep and modulation applications?
The AD9954YSVZ is the appropriate choice for frequency sweep, phase sweep, and amplitude modulation applications because its 1024-word × 32-bit RAM supports programmable linear sweep and profile-based modulation without continuous host processor intervention. The AD9952YSVZ lacks this RAM and is better suited to fixed-frequency or host-controlled modulation applications where sweep profiles are not required.