Overview
The AD8333ACPZ from Analog Devices Inc. is a dual-phase shifter and I/Q demodulator designed to enable coherent summing and phase alignment of multiple analog data channels. This component is particularly suited for high-performance applications such as medical ultrasound equipment featuring continuous wave (CW) Doppler. It integrates a divide-by-4 circuit to generate internal 0° and 90° phases of the local oscillator (LO) that drive the mixers of a pair of matched I/Q demodulators. The AD8333 is the first solid-state device of its kind, making it a significant advancement in beamformer circuits.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage, VS | - | - | 6 | V |
| Logic Level High | 1.7 | - | 5 | V |
| Logic Level Low | 0 | - | 1.3 | V |
| Bias Current (Logic High) | 10 | 40 | 90 | µA |
| Bias Current (Logic Low) | -30 | -7 | 10 | µA |
| Quiescent Power Per Channel | 160 | - | 190 | mW |
| PSRR (Pin VPOS to I/Q outputs) | -81 | - | - | dB |
| PSRR (Pin VNEG to I/Q outputs) | -75 | - | - | dB |
| Operating Temperature Range | -40 | - | 85 | °C |
| Package Type | - | - | 32-lead LFCSP (5 mm × 5 mm) | - |
Key Features
- Dual-phase shifter and I/Q demodulator for coherent summing and phase alignment of multiple analog data channels.
- Supports 16 discrete phase rotations in 22.5° increments for each channel.
- Asynchronous reset pin to synchronize LO dividers in array configurations.
- I and Q outputs provided as currents, facilitating summation and conversion using a high dynamic range current-to-voltage converter.
- High dynamic range of 159 dB/Hz at the I and Q outputs.
- RoHS compliant and lead-free.
Applications
- High-performance medical ultrasound equipment featuring CW Doppler.
- Analog beamformer circuits.
- Non-beamforming applications where independent I/Q demodulators are required.
Q & A
- What is the primary function of the AD8333? The AD8333 is a dual-phase shifter and I/Q demodulator that enables coherent summing and phase alignment of multiple analog data channels.
- What are the typical applications of the AD8333? The AD8333 is typically used in high-performance medical ultrasound equipment and analog beamformer circuits.
- What is the phase resolution of the AD8333? The AD8333 supports 16 discrete phase rotations in 22.5° increments for each channel.
- How does the AD8333 handle synchronization in array configurations? The AD8333 features an asynchronous reset pin to synchronize LO dividers in array configurations.
- What is the dynamic range of the I and Q outputs? The dynamic range at the I and Q outputs is 159 dB/Hz.
- What type of package is the AD8333 available in? The AD8333 is available in a 32-lead LFCSP (5 mm × 5 mm) package.
- What is the operating temperature range of the AD8333? The operating temperature range is from -40°C to +85°C.
- Is the AD8333 RoHS compliant? Yes, the AD8333 is RoHS compliant and lead-free.
- How are the I and Q outputs provided? The I and Q outputs are provided as currents to facilitate summation and conversion using a high dynamic range current-to-voltage converter.
- What additional components are needed for the I and Q outputs? A high dynamic range current-to-voltage converter, such as the AD8021, is needed to convert the current outputs to voltages.
