3 nV/√Hz, Ultralow Distortion,

High Speed Op Amp

Data Sheet

AD8045

Rev. B

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FEATURES

Ultralow distortion

SFDR

−101 dBc at 5 MHz

−90 dBc at 20 MHz

−63 dBc at 70 MHz

Third-order intercept

43 dBm at 10 MHz

Low noise

3 nV/√Hz

3 pA/√Hz

High speed

1 GHz, −3 dB bandwidth (G = +1)

1350 V/µs slew rate

7.5 ns settling time to 0.1%

Standard and low distortion pinout

Supply current: 15 mA

Offset voltage: 1.0 mV max

Wide supply voltage range: 3.3 V to 12 V

APPLICATIONS

Instrumentation

IF and baseband amplifiers

Active filters

ADC drivers

DAC buffers

CONNECTION DIAGRAMS

3

–IN

4

+IN

1

NIC

2

FEEDBACK

6 NIC

7 OUTPUT

AD8045

TOP VIEW

(Not to Scale)

NOTES

1. NIC = NO INTERNAL CONNECTION.

Figure 1. 8-Lead AD8045 LFCSP (CP-8)

FEEDBACK

1

–IN

2

+IN

3

NIC

8

7

OUTPUT

6

NIC

5

AD8045

TOP VIEW

(Not to Scale)

NOTES

1. NIC = NO INTERNAL CONNECTION.

Figure 2. 8-Lead AD8045 SOIC/EP (RD-8)

GENERAL DESCRIPTION

The AD8045 is a unity-gain stable voltage feedback amplifier

with ultralow distortion, low noise, and high slew rate. With a

spurious-free dynamic range of −90 dBc at 20 MHz, the AD8045 is

an ideal solution in a variety of applications, including ultrasound,

automated test equipment (ATE), active filters, and analog-to-

digital converter (ADC) drivers. The Analog Devices, Inc.,

proprietary next generation XFCB process and innovative

architecture enable such high performance amplifiers.

The AD8045 features a low distortion pinout for the LFCSP,

which improves second harmonic distortion and simplifies the

layout of the circuit board.

The AD8045 has a 1 GHz bandwidth, a 1350 V/µs slew rate, and

settles to 0.1% in 7.5 ns. With a wide supply voltage range (3.3 V

to 12 V) and a low offset voltage (200 µV), the AD8045 is an

ideal candidate for systems that require high dynamic range,

precision, and high speed.

The AD8045 amplifier is available in a 3 mm × 3 mm LFCSP

and the standard 8-lead SOIC. Both packages feature an exposed

paddle that provides a low thermal resistance path to the

printed circuit board (PCB). This enables more efficient heat

transfer and increases reliability. The AD8045 works over the

extended industrial temperature range (−40°C to +125°C).

FREQUENCY (MHz)

100

0.1

1

10

–20

–30

–40

–50

–60

–70

–80

–90

–100

–120

–110

HD3 LFCSP

HD2 LFCSP

G = +1

Figure 3. Harmonic Distortion vs. Frequency for Various Packages