
Quad-Channel, Ultra-Low-Noise Amplifier with
Digitally Programmable Input Impedance
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2034 Typical Application Circuit , V CC = +4.75V to +5.25V, source impedance R S = 200 ? , PD = 0, D2/D1/D0 = 0/1/0 (R IN = 200 ? ),
signal AC-coupled to IN_, INB_ is AC grounded, V OUT is the differential output between OUT_+ and OUT_-, f IN_ = 5MHz, R L = 200 ?
between the differential outputs, C L = 20pF from each output to ground, T A = 0°C to +70°C. Typical values are at V CC = 5.0V and T A =
+25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
R S = R IN = 50 ?
4.1
Noise Figure
NF
R S = R IN = 100 ?
R S = R IN = 200 ?
2.9
2.2
dB
R S = R IN = 1000 ?
1.4
Input-Referred Noise Voltage
Input-Referred Noise Current
D2 = 1 (high input impedance), f IN_ = 5MHz
D2 = 1 (high input impedance), f IN_ = 5MHz
0.87
2.1
nV/ √ Hz
pA/ √ Hz
Second Harmonic
Third Harmonic
HD2
HD3
f IN_ = 5MHz, V OUT = 1V P-P differential
f IN_ = 10MHz, V OUT = 1V P-P differential
f IN_ = 5MHz, V OUT = 1V P-P differential
f IN_ = 10MHz, V OUT = 1V P-P differential
-50
-68
-66
-50
-44
dBc
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
at 5.00MHz, V OUT = 1V P-P differential
7.49MHz tone relative to the second tone at
7.51MHz, which is 25dB lower than the first tone
-52
dBc
at 7.50MHz, V OUT = 1V P-P differential
Maximum Output Signal
Amplitude
Differential output
4.4
V P-P
Gain Compression
Output Common-Mode Level
Output Impedance
Phase Matching Between
Channels
Gain at V IN_ = 112mV P-P relative to gain at
V IN_ = 550mV P-P
Single-ended
Phase difference between channels with V IN_ =
195mV peak (-3dB full scale), f IN_ = 10MHz
0.5
2.45
5.3
±1.5
3
dB
V
?
deg
Channel-to-Channel Crosstalk
Switch Time from Normal to Sleep
Mode
Switch Time from Sleep to Normal
Mode
f IN_ = 10MHz, V OUT = 1V P-P, adjacent channels
Supply current settles to 90% of nominal sleep-
mode current I CC,PD
V OUT settles to 90% of final 1V P-P output
50
66
0.3
0.3
dB
ms
ms
Note 1: Min and max limits at T A = +25°C and +70°C are guaranteed by design, characterization, and/or production test.
Note 2: See the Ultrasound-Specific IMD3 Specification in the Applications Information section.
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3