Overview
The AD8334ACPZ-REEL, produced by Analog Devices Inc., is a quad-channel, ultralow noise, linear-in-dB, variable gain amplifier (VGA). This device is part of the AD8331/AD8332/AD8334 family and is optimized for high-performance applications such as ultrasound systems, automatic gain control (AGC) systems, and I/Q signal processing. The AD8334 features an ultralow noise preamplifier, an X-AMP® VGA with a 48 dB gain range, and a postamplifier, making it suitable for driving high-speed differential ADCs.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 4 |
| Gain Range | -4.5 dB to +43.5 dB (LO gain mode), 7.5 dB to 55.5 dB (HI gain mode) |
| Bandwidth | 100 MHz (−3 dB small signal bandwidth) |
| Power Consumption | 145 mW/channel |
| Input Voltage Noise | 0.82 nV/√Hz (RS = 0 Ω, HI or LO gain, RIZ = ∞, f = 5 MHz) |
| Slew Rate | 275 V/µs (LO gain), 1100 V/µs (HI gain) |
| Operating Temperature Range | −40°C to +85°C |
| Package Type | 64-lead LFCSP-VQ (9x9) |
Key Features
- Ultralow noise preamplifier with voltage noise of 0.74 nV/√Hz and current noise of 2.5 pA/√Hz
- Wide gain range with programmable postamp
- Low output-referred noise: 48 nV/√Hz typical
- Active input impedance matching
- Optimized for 10-bit/12-bit ADCs
- Selectable output clamping level to prevent input overload to subsequent ADCs
- Single 5 V supply operation
- Differential signal paths for superb second- and third-order distortion performance and low crosstalk
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 primary function of the AD8334? The AD8334 is a quad-channel, ultralow noise, linear-in-dB, variable gain amplifier (VGA) optimized for high-performance applications.
- What is the gain range of the AD8334? 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 AD8334? The bandwidth is 100 MHz (−3 dB small signal bandwidth).
- How much power does the AD8334 consume per channel? The power consumption is 145 mW per channel.
- What is the input voltage noise of the AD8334? The input voltage noise is 0.82 nV/√Hz (RS = 0 Ω, HI or LO gain, RIZ = ∞, f = 5 MHz).
- What is the slew rate of the AD8334? The slew rate is 275 V/µs in LO gain mode and 1100 V/µs in HI gain mode.
- What is the operating temperature range of the AD8334? The operating temperature range is −40°C to +85°C.
- In what package type is the AD8334 available? The AD8334 is available in a 64-lead LFCSP-VQ (9x9) package.
- What are some of the key applications of the AD8334? Key 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 AD8334 prevent input overload to subsequent ADCs? The AD8334 features a selectable output clamping level to prevent input overload to subsequent ADCs.
