Quad-Channel, Ultra-Low-Noise Amplifier with

Digitally Programmable Input Impedance

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3

AC ELECTRICAL CHARACTERISTICS (continued)

+25°C, unless otherwise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Ω

4.1

Ω

2.9

Ω

2.2

Noise Figure

NF

Ω

1.4

dB

Input-Referred Noise Voltage

0.87

nV/

√Hz

Input-Referred Noise Current

2.1

pA/

√Hz

-50

-68

Second Harmonic

HD2

-66

dBc

-50

Third Harmonic

HD3

-44

dBc

4.99MHz tone relative to the second tone at

5.01MHz, which is 25dB lower than the first tone

-45

-55

Two-Tone Intermodulation

Distortion (Note 2)

IMD3

7.49MHz tone relative to the second tone at

7.51MHz, which is 25dB lower than the first tone

-52

dBc

Maximum Output Signal

Amplitude

Differential output

4.4

Gain Compression

0.5

3dB

Output Common-Mode Level

2.45

V

Output Impedance

Single-ended

5.3

Ω

Phase Matching Between

Channels

±1.5

deg

Channel-to-Channel Crosstalk

50

66

dB

Switch Time from Normal to Sleep

Mode

Supply current settles to 90% of nominal sleep-

0.3

ms

Switch Time from Sleep to Normal

Mode

0.3

ms

Note 2: See the Ultrasound-Specific IMD3 Specification in the Applications Information section.