Features and Benefits
- Low noise
- Input voltage noise: 0.85 nV/√Hz
- Current noise: 2.0 pA/√Hz
- High speed
- 200 MHz bandwidth (G = 12.04 dB)
- 295 V/μs slew rate
- Selectable gain
- G = 12.04 dB (×4)
- G = 18.06 dB (×8)
- G = 21.58 dB (×12)
- G = 24.08 dB (×16)
- Active input impedance matching
- Integrated input clamp diodes
- Single-ended input, differential output
- Supply range: 4.5 V to 5.5 V
- Low power: 60 mW/channel
The AD8432 is a dual-channel, low power, ultralow noise amplifier with selectable gain and active impedance matching. Each channel has a single-ended input, differential output, and integrated input clamps. By pin strapping the gain setting pins, four accurate gains of G = 12.04 dB, 18.06 dB, 21.58 dB, and 24.08 dB (×4, ×8, ×12, and ×16, respectively) are possible. A bandwidth of 200 MHz at G = 12.04 dB makes this amplifier well suited for many high speed applications.
The exceptional noise performance of the AD8432 is made possible by the active impedance matching. Using a feedback network, the input impedance of the amplifiers can be adjusted to match the signal source impedance without compromising the noise performance. Impedance matching and low noise in the AD8432 allow designers to create wider dynamic range systems that are able to detect even very low level signals.
The AD8432 achieves 0.85 nV/√Hz input-referred voltage noise for a gain of 12.04 dB. The AD8432’s ultralow noise, low distortion, gain accuracy, and channel-to-channel matching are ideal for high performance ultrasound systems and for processing I/Q demodulator signals.
The AD8432 operates on a single supply of 5 V at 24 mA. It is available in a 4 mm × 4 mm, 24-lead LFSCP. The LFCSP features an exposed paddle that provides a low thermal resistance path to the PCB, which enables more efficient heat transfer and increases reliability. The operating temperature range is −40°C to +85°C.
- CW Doppler ultrasound front ends
- Low noise preamplification
- Predriver for I/Q demodulators and phase shifters
- Wideband analog-to-digital drivers
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
The AD8432 evaluation board is completely assembled and pretested, the board provides convenient and fast verification of system design and to assess the performance of the AD8432 under user-specific operating conditions.
The board provides access to the inputs, the outputs, and the gain settings. As shipped, the board is configured for a gain of 21 dB and 50 Ω input termination. Multiple combinations of gain and impedance matching are available to the user.
See figure 79 for bench Setup and testing the AD8432-EVALZ. The AD8432 data sheet available on-line. See the Evaluation Board Section for additional details.
Tools & Simulations
ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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