Overview
The AD8264ACPZ from Analog Devices Inc. is a quad, linear-in-dB, general-purpose, variable gain amplifier (VGA) with a preamplifier (preamp) and a flexible differential output buffer. This amplifier is designed for applications requiring wide bandwidth and low distortion, making it suitable for pulse processing. Each channel includes a single-ended input preamp/VGA section to maintain wide bandwidth and fast slew rate. The 6 dB differential output buffer features common-mode and offset adjustments, enabling direct coupling to most modern high-speed analog-to-digital converters (ADCs) using the converter reference output for optimal DC matching levels.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 4 | |
| Number of Amplifiers | 4 | |
| Bandwidth (Preamp/VGA) | DC to 235 MHz | |
| Bandwidth (Differential Driver) | 80 MHz | |
| Gain Range (Input to VGA Output) | 0 to 24 dB | |
| Gain Range (Input to Differential Output) | 6 to 30 dB | |
| Gain Scaling | 20 dB/V | |
| Supply Voltage | ±2.5 V to ±5 V | |
| Power Consumption per Channel | 140 mW at ±3.3 V | |
| Package Type | 40-Lead LFCSP | |
| Operating Temperature Range | -40°C to 85°C | |
| Slew Rate | 380 V/μs | |
| Noise (Voltage/Current) | 2.3 nV/√Hz, 2 pA/√Hz |
Key Features
- Precise linear-in-dB gain scaling of 20 dB/V
- DC-coupled with wide bandwidth, suitable for pulse processing
- Single-ended input and differential output
- Low noise: 2.3 nV/√Hz voltage noise and 2 pA/√Hz current noise
- Low power consumption: 140 mW per channel at ±3.3 V
- Flexible differential output buffer with common-mode and offset adjustments
- Operating from a bipolar power supply, enabling amplification of negative voltage pulses
Applications
- Multi-channel data acquisition
- Positron emission tomography (PET)
- Gain trim
- Industrial and medical ultrasound
- Radar receivers
Q & A
- Q: What is the bandwidth of the AD8264ACPZ?
A: The bandwidth of the preamp/VGA is DC to 235 MHz, and the bandwidth of the differential driver is 80 MHz.
- Q: What is the gain range of the AD8264ACPZ?
A: The gain range is 0 to 24 dB (input to VGA output) and 6 to 30 dB (input to differential output).
- Q: What is the supply voltage range for the AD8264ACPZ?
A: The supply voltage range is ±2.5 V to ±5 V.
- Q: What is the power consumption per channel of the AD8264ACPZ?
A: The power consumption per channel is 140 mW at ±3.3 V.
- Q: What is the operating temperature range of the AD8264ACPZ?
A: The operating temperature range is -40°C to 85°C.
- Q: What package type does the AD8264ACPZ come in?
A: The AD8264ACPZ comes in a 40-Lead LFCSP package.
- Q: What are the typical applications of the AD8264ACPZ?
A: Typical applications include multi-channel data acquisition, positron emission tomography, gain trim, industrial and medical ultrasound, and radar receivers.
- Q: How does the AD8264ACPZ handle noise?
A: The AD8264ACPZ has low noise characteristics with 2.3 nV/√Hz voltage noise and 2 pA/√Hz current noise.
- Q: Can the AD8264ACPZ be used for pulse processing?
A: Yes, the AD8264ACPZ is designed for pulse processing due to its DC-coupled nature and wide bandwidth.
- Q: How does the gain scaling work on the AD8264ACPZ?
A: The gain scaling is linear-in-dB with a scaling factor of 20 dB/V.
