Overview
The AD8330ACPZ-R2, produced by Analog Devices Inc., is a wideband variable gain amplifier (VGA) designed for applications requiring a fully differential signal path, low noise, well-defined gain, and moderately low distortion. This amplifier operates from DC to 150 MHz, making it suitable for a variety of high-frequency applications. The AD8330 features a linear-in-dB gain control with a range of 0 dB to 50 dB, adjustable via the VDBS pin, and an additional gain control port at the VMAG pin that allows for a numeric gain adjustment from 0.03 to 10. The device is available in 16-lead LFCSP and 16-lead QSOP packages and is specified for operation from −40°C to +85°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Full-Scale Input (VDBS = 0 V, differential drive) | ±1.4 | ±2 | ±6.3 mV | V |
| Input Resistance | 800 | 1 k | 1.2 k | Ω |
| Input Capacitance (Either pin to COMM) | 4 | pF | ||
| Voltage Noise Spectral Density (f = 1 MHz, VDBS = 1.5 V; inputs ac-shorted) | 5 | nV/√Hz | ||
| Common-Mode Voltage Level | 3.0 | V | ||
| Input Offset (Pin OFST connected to Pin COMM) | 1 | mV rms | ||
| Small Signal –3 dB Bandwidth (0 V < VDBS < 1.5 V) | 150 | MHz | ||
| Peak Slew Rate (VDBS = 0 V) | 1500 | V/μs | ||
| Peak-to-Peak Output Swing (VMAG ≥ 2 V) | ±1.8 | ±2 | ±2.2 | V |
| Supply Voltage | 2.7 | 6 | V | |
| Quiescent Current (VDBS = 0.75 V) | 20 | 27 | mA | |
| Current in Full Shutdown | 20 | 100 | μA | |
| Current in Hibernate Mode | 1.5 | mA |
Key Features
- Linear-in-dB and linear-in-magnitude gain modes with a range of 0 dB to 50 dB, adjustable via the VDBS pin.
- A second gain control port at the VMAG pin allows for numeric gain adjustment from 0.03 to 10.
- Constant bandwidth of 150 MHz at all gains, ensuring stable HF response.
- Low noise: 5 nV/√Hz typical at maximum gain.
- Low distortion: ≤−62 dBc typical.
- Low power consumption: 20 mA typical at VS of 2.7 V to 6 V.
- Available in 16-lead LFCSP and 16-lead QSOP packages.
- Operates from −40°C to +85°C.
- Two levels of power-down: fully off and a hibernate mode.
- An external capacitor at Pin OFST sets the high-pass corner of an offset reduction loop, with a frequency as low as 5 Hz.
- External common-mode control voltage at Pin CNTR for driving ADCs.
Applications
- Pre-ADC signal conditioning.
- Adjustable gain control (AGC) amplifiers.
- 75 Ω cable driving.
- High-frequency signal processing where constant bandwidth and low distortion are critical.
Q & A
- What is the operating frequency range of the AD8330?
The AD8330 operates from DC to 150 MHz.
- What are the gain control modes available on the AD8330?
The AD8330 features linear-in-dB and linear-in-magnitude gain modes, with a range of 0 dB to 50 dB adjustable via the VDBS pin, and an additional numeric gain adjustment from 0.03 to 10 via the VMAG pin.
- What is the bandwidth of the AD8330 at all gains?
The bandwidth is constant at 150 MHz for all gains.
- How does the AD8330 handle temperature and supply voltage variations?
All parameters of the AD8330 have low sensitivities to temperature and supply voltages.
- What are the power-down modes available on the AD8330?
The AD8330 has two levels of power-down: fully off and a hibernate mode.
- How can the offset be controlled in the AD8330?
An external capacitor at Pin OFST sets the high-pass corner of an offset reduction loop, with a frequency as low as 5 Hz.
- What is the typical noise performance of the AD8330?
The typical voltage noise spectral density is 5 nV/√Hz at maximum gain.
- What are the package options for the AD8330?
The AD8330 is available in 16-lead LFCSP and 16-lead QSOP packages.
- What is the operating temperature range of the AD8330?
The AD8330 operates from −40°C to +85°C.
- Can the AD8330 be used for driving ADCs?
Yes, the AD8330 can be used for driving ADCs with an external common-mode control voltage at Pin CNTR.
