Overview
The AD8334ACPZ from Analog Devices Inc. is an ultralow noise, quad-channel linear-in-dB variable gain amplifier (VGA). Although optimized for ultrasound systems, it can be used as a low noise variable gain control in various applications where the operating frequency is less than 100 MHz. Each channel includes an ultralow noise preamp (LNA), an X-AMP® VGA with a 48 dB gain range, and a selectable gain postamp with adjustable output limiting. The device operates on a single 5 V supply and is available in a 64-lead LFCSP package.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | Quad |
| Gain Range | LO gain: -4.5 dB to +43.5 dB, HI gain: 7.5 dB to 55.5 dB |
| Bandwidth | -3 dB Small Signal Bandwidth: 100 MHz, -3 dB Large Signal Bandwidth: 90 MHz |
| Slew Rate | LO gain: 275 V/µs, HI gain: 1100 V/µs |
| Input Voltage Noise | 0.82 nV/√Hz at 5 MHz |
| Noise Figure | 2.0 dB to 4.15 dB depending on the configuration |
| Supply Voltage | Single 5 V |
| Operating Temperature | -40°C to +85°C |
| Package Type | 64-lead LFCSP |
| Supply Current | 116 mA |
Key Features
- Ultralow noise preamp (LNA) with adjustable input impedance matching.
- X-AMP® VGA with 48 dB gain range and linear-in-dB scaling of 50 dB/V.
- Selectable gain postamp with adjustable output limiting.
- Excellent bandwidth uniformity across the entire gain range.
- Differential signal paths for superb second- and third-order distortion performance and low crosstalk.
- Single 5 V supply operation.
- Optimized for 10-bit/12-bit ADCs.
- Active input impedance matching and low output-referred noise.
Applications
- Ultrasound and sonar time-gain controls.
- High performance automatic gain control (AGC) systems.
- I/Q signal processing.
- High speed, dual ADC drivers.
Q & A
- What is the gain range of the AD8334ACPZ?
The gain range is -4.5 dB to +43.5 dB in LO gain mode and 7.5 dB to 55.5 dB in HI gain mode.
- What is the bandwidth of the AD8334ACPZ?
The -3 dB small signal bandwidth is 100 MHz, and the -3 dB large signal bandwidth is 90 MHz.
- What is the slew rate of the AD8334ACPZ?
The slew rate is 275 V/µs in LO gain mode and 1100 V/µs in HI gain mode.
- What is the input voltage noise of the AD8334ACPZ?
The input voltage noise is 0.82 nV/√Hz at 5 MHz.
- What is the supply voltage and current of the AD8334ACPZ?
The device operates on a single 5 V supply and consumes 116 mA of current.
- What is the operating temperature range of the AD8334ACPZ?
The operating temperature range is -40°C to +85°C.
- What package type is the AD8334ACPZ available in?
The device is available in a 64-lead LFCSP package.
- What are the typical applications of the AD8334ACPZ?
Typical applications include ultrasound and sonar time-gain controls, high performance AGC systems, I/Q signal processing, and high speed, dual ADC drivers.
- How does the AD8334ACPZ achieve low noise performance?
The device includes an ultralow noise preamp (LNA) and maintains excellent bandwidth uniformity across the entire gain range, contributing to its low noise performance.
- Is the AD8334ACPZ optimized for any specific type of ADC?
Yes, it is optimized for 10-bit/12-bit ADCs.
