6.5 GHz, Ultrahigh Dynamic Range,

Differential Amplifier

Data Sheet

ADL5569

Rev. C

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FEATURES

−3 dB bandwidth: 6.5 GHz typical

Preset 20 dB voltage gain, can be reduced by adding

external resistors

Differential or single-ended input to differential output

Internally dc-coupled inputs and outputs

Low noise input stage: 9.3 dB noise figure at 2 GHz

Low distortion at 5V supply and 2V p-p output with 100 Ω load

500 MHz: −78 dBc (HD2), −71 dBc (HD3), −80 dBc (IMD3)

2 GHz: −64 dBc (HD2), −52 dBc (HD3), −65 dBc (IMD3)

Input voltage noise (NSD, RTI): 1.0 nV/√Hz at 100 MHz

Single-supply operation: ac-coupled applications

Dual-supply operation: dc-coupled applications

Slew rate: 24 V/ns at 2 V p-p output

DC power consumption: 86 mA per amplifier at 5 V

APPLICATIONS

Differential ADC drivers for GSPS ADCs

High speed data acquisition

Single-ended to differential conversion

DAC buffering

DC coupling and level shifting

RF/IF gain blocks

Balun alternative from dc to 4 GHz

SAW filter interfacing

FUNCTIONAL BLOCK DIAGRAM

50Ω

500Ω

50Ω

500Ω

GM

B

50Ω

500Ω

VIN

VIP

VON

VOP

VIN2

NOTES

OF THE AMPLIFIER.

VIP2

VON2

VOP2

PDB

VCOM

VCC

GND

GND

PDB2

VCOM2

VCC2

1

2

3

11

GM

B

50Ω

500Ω

4

5

13

12

10

9

6

7

8

16

15

14

ADL5569

Figure 1.

GENERAL DESCRIPTION

The ADL5569 is a high performance, dual, differential amplifier

with 20 dB of voltage gain, optimized for applications spanning

from dc to 6.5 GHz. The amplifier is available in a dual format,

and it offers a low referred to input (RTI) noise spectral density

(NSD) of 1.0 nV/√Hz (at 100 MHz) and excellent distortion

performance over a wide frequency range, making it an ideal

driver for high speed 12-bit to 16-bit analog-to-digital converters

(ADCs). The ADL5569 is ideally suited for use in high perfor-

mance zero intermediate frequency (IF) and complex IF receiver

designs. In addition, this device has excellent low distortion for

single-ended input driver applications.

Using two external series resistors for each amplifier expands

the gain flexibility of the amplifier and allows any gain selection

from 6 dB to 20 dB for a differential input. For a single-ended

input, the gain can be adjusted from 6 dB to 17 dB with the

addition of some external resistors. This device maintains low

distortion through its output common-mode range of 2.0 V to

3.0 V, providing a flexible capability for driving ADCs with

ac levels up to 2 V p-p.

Operating from a single 5 V supply, the quiescent current of the

ADL5569 is typically 86 mA per amplifier. When disabled, the

amplifiers consume only 8 mA per amplifier.

The device is optimized for wideband, low distortion, and low

noise operation, giving it unprecedented second harmonic

distortion (HD2) and third harmonic distortion (HD3) from

dc to 4 GHz. These attributes, together with its adjustable gain

capability, make this device the amplifier of choice for driving a

wide variety of ADCs, mixers, pin diode attenuators, surface

acoustic wave (SAW) filters, and a multitude of discrete radio

frequency (RF) devices.

Fabricated on an Analog Devices, Inc., high speed silicon germa-

nium (SiGe) process, the ADL5569 is supplied in a compact

2.5 mm × 3 mm, 16-lead LFCSP package and operates over the

−40°C to +85°C temperature range.