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The ADA4927-1/ADA4927-2 are low noise, low distortion, high speed current feedback differential amplifiers suitable for driving high performance ADCs with resolutions up to 16 bits from DC to 100 MHz. The output common-mode level of the ADA4927-1/ADA4927-2 is adjustable, making it easy to match the desired ADC input common-mode level. An internal common-mode feedback loop also provides excellent output balance and even-order harmonic distortion rejection.

The ADA4927-1/ADA4927-2 can be easily configured for differential gain with a simple external feedback network of four resistors. The loop gain provided by the current feedback architecture is almost independent of the closed loop gain, resulting in wide bandwidth at high gain, low distortion and low noise, and the device also has lower power consumption than competing voltage feedback amplifiers. consumption.

Manufactured on Analog Devices' proprietary silicon germanium (SiGe) complementary bipolar process, the ADA4927-1/ADA4927-2 feature extremely low distortion with an input voltage noise of only 1.3 nV/√Hz. The low DC offset and excellent dynamic performance of the ADA4927-1/ADA4927-2 make them ideal for a variety of data acquisition and signal processing applications.

The ADA4927-1 is available in a 3 mm × 3 mm 16-lead LFCSP lead-free package, and the ADA4927-2 is available in a 4 mm × 4 mm 24-lead LFCSP lead-free package. The pinout is optimized for board layout for minimal distortion. The operating temperature range of the ADA4927-1 and ADA4927-2 is -40°C to +105°C.

application

Current Feedback ADC Driver

Single-Ended-Differential Converters

Intermediate Frequency (IF) and Baseband Gain Blocks

Differential buffer

line driver

Very low harmonic distortion

?105dBc HD2 @ 10MHz

?91 dBc HD2 @ 70 MHz

?87dBc HD2 @ 100MHz

?103 dBc HD3 @ 10 MHz

?98dBc HD3 @ 70MHz

?89dBc HD3 @ 100MHz

Lower distortion at higher gains compared to voltage feedback amplifiers

Input-referred noise: as low as 1.4 nV/√Hz

high speed

-3 dB bandwidth: 2.3 GHz

0.1 dB Gain Flatness: 150 MHz

Slew rate: 5000 V/μs, 25% to 75%_Fast settling time: 10 ns to 0.1%_Low input offset voltage: 0.3 mV (typ)

Externally adjustable gain

Shenzhen Yujixin Electronics Co., Ltd.

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