Ultralow Noise

Drivers for Low Voltage ADCs

Data Sheet

ADA4930-1/ADA4930-2

Rev. C

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FEATURES

Low input voltage noise: 1.2 nV/√Hz

Low common-mode output: 0.9 V on single supply

Extremely low harmonic distortion

−104 dBc HD2 at 10 MHz

−79 dBc HD2 at 70 MHz

−73 dBc HD2 at 100 MHz

−101 dBc HD3 at 10 MHz

−82 dBc HD3 at 70 MHz

−75 dBc HD3 at 100 MHz

High speed

−3 dB bandwidth of 1.35 GHz, G = 1

Slew rate: 3400 V/μs, 25% to 75%

0.1 dB gain flatness to 380 MHz

Fast overdrive recovery of 1.5 ns

0.5 mV typical offset voltage

Externally adjustable gain

Differential-to-differential or single-ended-to-differential

operation

Adjustable output common-mode voltage

Single-supply operation: 3.3 V or 5 V

APPLICATIONS

ADC drivers

Single-ended-to-differential converters

IF and baseband gain blocks

Differential buffers

Line drivers

GENERAL DESCRIPTION

The ADA4930-1/ADA4930-2 are very low noise, low distortion,

high speed differential amplifiers. They are an ideal choice for

driving 1.8 V high performance ADCs with resolutions up to

14 bits from dc to 70 MHz. The adjustable output common

mode allows the ADA4930-1/ADA4930-2 to match the input of

the ADC. The internal common-mode feedback loop provides

exceptional output balance, suppression of even-order harmonic

distortion products, and dc level translation.

With the ADA4930-1/ADA4930-2, differential gain configurations

are easily realized with a simple external feedback network of

four resistors determining the closed-loop gain of the amplifier.

The ADA4930-1/ADA4930-2 are fabricated using Analog Devices,

Inc., proprietary silicon-germanium (SiGe), complementary

bipolar process, enabling them to achieve very low levels of

distortion with an input voltage noise of only 1.2 nV/√Hz.

FUNCTIONAL BLOCK DIAGRAMS

–FB

+IN

–IN

+FB

–OUT

PD

+OUT

12

11

10

1

3

4

9

2

ADA4930-1

Figure 1.

–IN1

+FB1

–FB2

+IN2

ADA4930-2

+OUT1

PD2

–OUT2

2

1

3

4

5

6

18

17

16

15

14

13

Figure 2.

0

1

10

100

10

100

1k

10k

100k

1M

10M

100M

FREQUENCY (Hz)

Figure 3. Voltage Noise Spectral Density

The low dc offset and excellent dynamic performance of the

ADA4930-1/ADA4930-2 make them well suited for a wide

variety of data acquisition and signal processing applications.

The ADA4930-1 is available in a Pb-free, 3 mm × 3 mm 16-lead

LFCSP, and the ADA4930-2 is available in a Pb-free, 4 mm × 4 mm

24-lead LFCSP. The pinout has been optimized to facilitate printed

circuit board (PCB) layout and minimize distortion. The

ADA4930-1 is specified to operate over the −40°C to +105°C

temperature range, and the ADA4930-2 is specified to operate over

the −40°C to +105°C temperature range for 3.3 V or 5 V supply

voltages.