Overview
The AD8333ACPZ-WP, produced by Analog Devices Inc., is a dual-phase shifter and I/Q demodulator designed for coherent summing and phase alignment of multiple analog data channels. This device 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) for driving the mixers of a pair of matched I/Q demodulators. The AD8333 is available in a 32-lead LFCSP (5 mm × 5 mm) package and operates over an industrial temperature range of −40°C to +85°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage, VS | 6 | V | ||
| Operating Temperature Range | −40 | +85 | °C | |
| Storage Temperature Range | −65 | +150 | °C | |
| Maximum Junction Temperature | 150 | °C | ||
| Maximum Power Dissipation (Exposed Pad Soldered to PC Board) | 1.5 | W | ||
| Quiescent Power Per Channel (all phase bits = 0) | 160 | mW | ||
| Quiescent Power Per Channel (any 0 or 1 combination of phase bits) | 190 | mW | ||
| PSRR (Pin VPOS to I/Q outputs) | −81 | dB | ||
| PSRR (Pin VNEG to I/Q outputs) | −75 | dB | ||
| Phase Shift Increments | 16 discrete phase rotations in 22.5° increments |
Key Features
- Dual-phase shifter and I/Q demodulator for coherent summing and phase alignment of multiple analog data channels.
- Suitable for high-performance medical ultrasound equipment featuring CW Doppler.
- Internal divide-by-4 circuit generates 0° and 90° phases of the local oscillator (LO).
- Asynchronous reset pin for synchronizing LO dividers in arrays.
- Sixteen discrete phase rotations in 22.5° increments can be selected independently for each channel.
- High channel-to-channel matching: ±0.05 dB phase match and ±0.25 dB amplitude match.
- Available in a 32-lead LFCSP (5 mm × 5 mm) package.
- Operates over an industrial temperature range of −40°C to +85°C.
Applications
- High-performance medical ultrasound equipment featuring Continuous Wave (CW) Doppler.
- Analog beamformer circuits in medical imaging.
- Other applications requiring precise phase alignment and coherent summing of analog data channels.
Q & A
- What is the primary function of the AD8333?
The AD8333 is a dual-phase shifter and I/Q demodulator designed for coherent summing and phase alignment of multiple analog data channels.
- In what type of applications is the AD8333 commonly used?
The AD8333 is commonly used in high-performance medical ultrasound equipment featuring CW Doppler and in analog beamformer circuits.
- What is the operating temperature range of the AD8333?
The AD8333 operates over an industrial temperature range of −40°C to +85°C.
- How many discrete phase rotations can be selected for each channel?
Sixteen discrete phase rotations in 22.5° increments can be selected independently for each channel.
- What is the package type and size of the AD8333?
The AD8333 is available in a 32-lead LFCSP (5 mm × 5 mm) package.
- What is the maximum supply voltage for the AD8333?
The maximum supply voltage for the AD8333 is 6 V.
- How does the asynchronous reset pin function?
The asynchronous reset pin sets all the LO dividers in the same state when used in arrays.
- What is the quiescent power consumption per channel?
The quiescent power consumption per channel is 160 mW when all phase bits are 0, and 190 mW for any combination of phase bits.
- What is the PSRR of the AD8333?
The PSRR (Power Supply Rejection Ratio) is −81 dB for Pin VPOS to I/Q outputs and −75 dB for Pin VNEG to I/Q outputs.
- What are the key matching specifications between channels?
The AD8333 features ±0.05 dB phase match and ±0.25 dB amplitude match between channels.
