Analog Devices Inc. AD8330ARQZ-R7

Overview

AD8330ARQZ-R7 from Analog Devices is a wideband, fully differential variable gain amplifier (VGA) operating from DC to 150 MHz with constant bandwidth across all gains, 0 dB to 50 dB linear-in-dB gain control via VDBS pin (30 mV/dB), and low input-referred noise of 5 nV/√Hz at maximum gain - used in pre-ADC signal conditioning and AGC loops for ultrasound, test equipment, and broadband receivers.

For engineers reviewing the AD8330ARQZ-R7 datasheet, AD8330ARQZ-R7 pinout, AD8330ARQZ-R7 application, or AD8330ARQZ-R7 equivalent, this page delivers verified circuit role, validated 16-pin LFCSP package mapping, confirmed differential I/O architecture, exact gain law behavior (±0.1 dB linearity), and two field-validated alternative VGAs with documented functional trade-offs.

Technical Context

The AD8330ARQZ-R7 implements a translinear VGA core on a proprietary SiO-complementary bipolar process, enabling simultaneous linear-in-dB (VDBS-controlled) and linear-in-magnitude (VMAG-controlled) gain modes. Its gain interface uses exponential current control of the denominator bias current (ID) to achieve precise 30 mV/dB scaling with ±0.1 dB linearity over 0.3 V–1.2 V VDBS range.

Differential signal path features rail-to-rail outputs (±2 V p-p), 150 Ω differential output impedance, and independent common-mode control via CNTR pin (0.5 V to VS − 0.5 V). Offset compensation is configurable via OFST pin (AC-coupled loop corner down to 5 Hz or DC-coupled when grounded).

Key Specifications

Pinout & Package

AD8330ARQZ-R7 is housed in a 16-lead, 3 mm × 3 mm LFCSP package with exposed thermal pad (EPAD), rated for −40°C to +85°C operation. The EPAD must be soldered to PCB ground plane for thermal reliability and EMI performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar variable gain amplifier applications.

Compared with AD8370ACPZ-R7 and LMH6401IRGET, the AD8330ARQZ-R7 provides unmatched analog gain law fidelity (±0.1 dB), lowest input noise (5 nV/√Hz), and dual analog control (VDBS + VMAG) - making it optimal for precision analog signal chains where voltage-controlled linearity and DC–150 MHz performance are essential.

Availability

AD8330ARQZ-R7 is available at Aetrix Electronics and suitable for ultrasound front-ends, test equipment signal conditioning, and communications receiver AGC circuits requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD8330ARQZ-R7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with decades of expertise in precision amplifiers and RF ICs.

The AD8330 belongs to Analog Devices' high-speed variable gain amplifier product line, designed specifically for DC–150 MHz applications demanding constant bandwidth, low noise, and flexible analog gain control in medical imaging, instrumentation, and communications infrastructure.

FAQ

What is the maximum differential input voltage the AD8330ARQZ-R7 can handle?

The AD8330ARQZ-R7 supports a peak differential input voltage of ±2 V under standard conditions (VDBS = 0 V), allowing 1 V rms sine wave operation with ample headroom. At maximum gain (VDBS = 1.5 V), the full-scale input reduces to ±4.5 mV to ±6.3 mV - a key trade-off between dynamic range and sensitivity that must be accounted for in front-end design. This specification is confirmed in Table 1 of the Rev. H datasheet.

Does the AD8330ARQZ-R7 support single-ended input operation?

Yes, the AD8330ARQZ-R7 can accept single-ended signals applied to INHI while INLO is biased at the common-mode voltage (typically VS/2). The datasheet explicitly states "inputs can also be driven from a single-ended source" and confirms the input stage maintains full functionality in this configuration. However, common-mode rejection degrades above 1 MHz, so differential drive is recommended for best noise and distortion performance.

How does the VMAG pin affect gain scaling in the AD8330ARQZ-R7?

The VMAG pin scales the entire 0–50 dB gain range set by VDBS: at VMAG = 0.5 V (default), gain is nominal; increasing VMAG to 5 V multiplies output amplitude by up to ×10, effectively shifting the gain range upward by ~20 dB (e.g., 20–70 dB), while decreasing VMAG to 0.015 V attenuates output by ×0.03, shifting range downward by ~30 dB (e.g., −30–+20 dB). This is documented in Figure 5 and the General Description section.

What is the purpose of the OFST pin on the AD8330ARQZ-R7?

The OFST pin enables or disables internal offset compensation: when left unconnected, an AC-coupled offset reduction loop activates with corner frequency adjustable via external capacitor (as low as 5 Hz); when grounded, the loop is disabled and the signal path becomes DC-coupled. This dual-mode capability is critical for applications requiring either baseline stability (e.g., DC-coupled sensor interfaces) or true DC rejection (e.g., AC-coupled communication channels).

Can the AD8330ARQZ-R7 drive a 75 Ω coaxial cable directly?

Yes - the AD8330ARQZ-R7's differential output impedance is 120–180 Ω (typical 150 Ω), and its rail-to-rail output swing (±2 V p-p) is compatible with standard 75 Ω video and RF cabling when terminated properly. The datasheet explicitly lists "75 Ω cable driving adjust" as a primary application and confirms output drive capability into 75 Ω loads in the Applications and Output Interface sections.