MAX2078(2009) Ver la hoja de datos (PDF) - Maxim Integrated
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MAX2078 Datasheet PDF : 25 Pages
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Octal-Channel Ultrasound Front-End
with CW Doppler Mixers
Typical Operating Characteristics (continued)
(Typical Application Circuit, VREF = 2.475V to 2.525V, VCC1 = 3.13V to 3.47V, VCC2 = 4.5V to 5.25V, TA = 0°C to +70°C, VGND = 0V,
NP = 0, PD = 0, CLP = 0, D43/D42/D41/D40 = 1/0/1/0 (RIN = 200Ω, LNA gain = 18.5dB), D45/D44 = 1/1(fC = 18MHz), fRF = fLO/16 =
5MHz, capacitance to GND at each of the VGA differential outputs is 25pF, differential capacitance across VGA outputs is 15pF,
RL = 1kΩ differential, RS = 200Ω, CI_, CQ_ pulled up to 11V through four separate 0.1% 162Ω resistors, the rise/fall time of the LVDS
clock driving the LO_ is required to be 0.5ns, reference noise less than 10nV/√Hz from 1kHz to 20MHz, DOUT loaded with 10MΩ
and 60pF. Typical values are at VCC1 = 3.3V, VCC2 = 5V, TA = +25°C, unless otherwise noted.)
THIRD-HARMONIC DISTORTION
vs. GAIN
-30
VOUT = 1VP-P
-40
-50
fRF = 5MHz
fRF = 10MHz
-60
TWO-TONE ULTRASOUND-SPECIFIC IMD3
vs. GAIN
-10
VOUT = 1VP-P
-30
fRF = 10MHz
-50
SECOND- AND THIRD-HARMONIC
DISTORTION vs. VOUT_P-P
-50
GAIN = 26dB
fRF = 5MHz
-60
HD2
-70
-70
fRF = 5MHz
-70
-80
fRF = 2MHz
fRF = 2MHz
-90
-90
20
26
32
38
44
20
26
32
38
44
GAIN (dB)
GAIN (dB)
-80
HD3
-90
0
0.2 0.4 0.6 0.8 1.0
VOUT_P-P (V)
SECOND- AND THIRD-HARMONIC
DISTORTION vs. FREQUENCY
-30
VOUT = 1VP-P
GAIN = 26dB
-40
HD2
-50
-60
-70
HD3
SECOND- AND THIRD-HARMONIC DISTORTION
vs. DIFFERENTIAL OUTPUT RESISTANCE
-30
VOUT = 1VP-P
GAIN = 26dB
-40 fRF = 5MHz
-50
HD2
-60
-70
HD3
-80
SECOND- AND THIRD-HARMONIC DISTORTION
vs. DIFFERENTIAL OUTPUT LOAD CAPACITANCE
-30
VOUT = 1VP-P
GAIN = 26dB
-40 fRF = 5MHz
-50
HD2
-60
-70
HD3
-80
-80
0
-90
5
10
15
20
200 300 400 500 600 700 800 900 1000
FREQUENCY (MHz)
RESISTANCE (Ω)
-90
0
20
40
60
80 100
CAPACITANCE (pF)
10 ______________________________________________________________________________________
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