Part A
AD9835BRUZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 2866 PCS
- Series
- Interface - synthèse numérique directe (DDS)
Replacement verdict
Compatible functional replacement candidate
The AD9834CRUZ and AD9835BRUZ are both complete DDS synthesizers in a 20-lead TSSOP package with a 10-bit DAC, 28-bit resolution, and a serial interface, making them functionally interchangeable in many designs. However, the AD9834CRUZ offers a wider maximum clock rate of 75 MHz versus 50 MHz for the AD9835BRUZ, and the two devices differ in their on-chip comparator and modulation capabilities, so the replacement should be validated against the target application's frequency and signal-chain requirements.
Package Type
High match
DAC Resolution
High match
Maximum Clock Rate
Validation required
On-Chip Comparator
Validation required
Parts at a glance
Part B
AD9834CRUZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3866 PCS
- Series
- Interface - synthèse numérique directe (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 | AD9834CRUZ | AD9835BRUZ | Why it matters |
|---|---|---|---|
| DAC Resolution | 10 bit | 10 bit | Both use a 10-bit DAC, so output spectral purity and quantization noise performance are comparable. |
| Maximum Output Frequency | 37.5 MHz | 25 MHz | The AD9834 can generate higher-frequency outputs, which matters for higher-band applications. |
| Maximum Clock Frequency | 75 MHz | 50 MHz | A higher master clock allows a wider tuning range and finer frequency resolution. |
| Frequency Resolution (at max clock) | 0.28 Hz | 0.0116 Hz | Finer resolution enables more precise frequency synthesis, important for instrumentation and communications. |
| On-Chip Comparator | Yes | No | The AD9834's comparator supports square-wave/clock generation without external circuitry. |
| Supply Voltage Range | 2.3 V to 5.5 V | 4.5 V to 5.5 V | The AD9834 supports lower supply voltages, enabling use in 3.3 V and low-power systems. |
| Package | 20-Lead TSSOP | 16-Lead TSSOP | Different pin counts and footprints affect PCB layout and drop-in compatibility. |
| Interface | SPI (3-wire serial) | SPI (3-wire serial) | Both use a compatible serial interface, simplifying firmware reuse across designs. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +85 °C | The wider temperature range of the AD9834 suits harsher industrial environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9835BRUZ | AD9834CRUZ |
|---|---|---|
| Part Status | Active | Active |
| Base Product Number | AD9835 | AD9834 |
| Resolution (Bits) | 10 b | 10 b |
| Master fclk | 50 MHz | 75 MHz |
| Tuning Word Width (Bits) | 32 b | 28 b |
| Voltage - Supply | 4.75V ~ 5.25V | 2.3V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 105°C |
| Mounting Type | Surface Mount | Surface Mount |
| Packaging | Tube | Tube |
Frequently asked questions
What are the key differences between the AD9834CRUZ and AD9835BRUZ?
The AD9834CRUZ is a 75 MHz, 10-bit DDS with a 10-bit DAC and on-chip comparator, while the AD9835BRUZ is a 50 MHz, 10-bit DDS with a 10-bit DAC but no on-chip comparator. The AD9834CRUZ supports a 75 MHz maximum clock rate versus 50 MHz for the AD9835BRUZ, and the AD9834CRUZ includes a comparator for square-wave/clock generation that the AD9835BRUZ does not provide.
Are the AD9834CRUZ and AD9835BRUZ pin-compatible?
Both devices are offered in a 20-lead TSSOP (RUZ) package, but they are not functionally pin-compatible. The AD9834CRUZ includes comparator-related pins (e.g., VIN and SIGN BIT OUT) that are not present on the AD9835BRUZ, so the pin functions differ and a direct drop-in replacement is not possible without design changes.
What is the maximum output frequency of each device?
The AD9834CRUZ supports a maximum clock rate of 75 MHz, and the AD9835BRUZ supports a maximum clock rate of 50 MHz. In DDS operation the usable output frequency is limited by the Nyquist criterion relative to the master clock, so the AD9834CRUZ can generate higher output frequencies than the AD9835BRUZ.
Do both devices include an on-chip comparator?
No. The AD9834CRUZ includes an on-chip comparator that can convert the sinusoidal DAC output into a square wave, making it suitable for clock-generation applications. The AD9835BRUZ does not include an on-chip comparator.
What is the DAC resolution of the AD9834CRUZ and AD9835BRUZ?
Both the AD9834CRUZ and the AD9835BRUZ feature a 10-bit DAC. The DAC resolution is therefore identical between the two devices, and selection between them should be based on clock rate, comparator availability, and other system requirements rather than DAC resolution.
What power supply voltage do these devices require?
Both the AD9834CRUZ and the AD9835BRUZ operate from a single 2.3 V to 5.5 V power supply, according to the Analog Devices datasheets. This wide supply range allows operation from common 3.3 V and 5 V rails.
What serial interface do the AD9834CRUZ and AD9835BRUZ use?
Both devices use a 3-wire SPI-compatible serial interface for programming the frequency and phase registers. The interface consists of serial data, serial clock, and frame sync (FSYNC) signals, allowing direct connection to most microcontrollers and DSPs.
Can the AD9835BRUZ be used as a drop-in replacement for the AD9834CRUZ?
No. Although both are 20-lead TSSOP DDS devices with 10-bit DACs, the AD9835BRUZ lacks the on-chip comparator and has a lower 50 MHz maximum clock rate versus 75 MHz for the AD9834CRUZ. Pin functions also differ, so replacing an AD9834CRUZ with an AD9835BRUZ requires schematic and layout changes and verification against the target design requirements.