max2078ctk Maxim Integrated Products, Inc., max2078ctk Datasheet - Page 10

• Manufacturer Part Number: max2078ctk
• Description: Octal-channel Ultrasound Front-end With Cw Doppler Mixers
• Manufacturer: Maxim Integrated Products, Inc.

Octal-Channel Ultrasound Front-End
with CW Doppler Mixers
( Typical Application Circuit , V
NP = 0, PD = 0, CLP = 0, D43/D42/D41/D40 = 1/0/1/0 (R
= 5MHz, capacitance to GND at each of the VGA differential outputs is 25pF, differential capacitance across VGA outputs is 15pF,
R
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 V
10
L
= 1kΩ differential, R
-30
-40
-50
-60
-70
-80
-90
-30
-40
-50
-60
-70
-80
______________________________________________________________________________________
20
0
V
V
GAIN = 26dB
OUT
f
OUT
RF
SECOND- AND THIRD-HARMONIC
THIRD-HARMONIC DISTORTION
DISTORTION vs. FREQUENCY
f
= 2MHz
= 1V
RF
= 1V
= 5MHz
26
P-P
5
P-P
FREQUENCY (MHz)
HD2
vs. GAIN
GAIN (dB)
S
f
32
10
RF
= 200Ω, CI_, CQ_ pulled up to 11V through four separate 0.1% 162Ω resistors, the rise/fall time of the LVDS
= 10MHz
REF
38
15
CC
HD3
= 2.475V to 2.525V, V
1 = 3.3V, V
44
20
CC
-30
-40
-50
-60
-70
-80
-90
-10
-30
-50
-70
-90
Typical Operating Characteristics (continued)
SECOND- AND THIRD-HARMONIC DISTORTION
2 = 5V, T
200
TWO-TONE ULTRASOUND-SPECIFIC IMD3
20
vs. DIFFERENTIAL OUTPUT RESISTANCE
V
V
GAIN = 26dB
f
RF
OUT
OUT
300
= 5MHz
CC
= 1V
= 1V
IN
1 = 3.13V to 3.47V, V
400
A
26
P-P
P-P
= 200Ω, LNA gain = 18.5dB), D45/D44 = 1/1 (f
= +25°C, unless otherwise noted.)
RESISTANCE (Ω)
f
RF
500
vs. GAIN
= 5MHz
GAIN (dB)
f
600
RF
32
HD2
HD3
= 10MHz
700
f
RF
800
= 2MHz
38
900
CC
2 = 4.5V to 5.25V, T
1000
44
-30
-40
-50
-60
-70
-80
-90
-50
-60
-70
-80
-90
vs. DIFFERENTIAL OUTPUT LOAD CAPACITANCE
SECOND- AND THIRD-HARMONIC DISTORTION
0
0
GAIN = 26dB
f
V
GAIN = 26dB
f
RF
RF
OUT
SECOND- AND THIRD-HARMONIC
A
= 5MHz
= 5MHz
= 1V
= 0°C to +70°C, V
DISTORTION vs. V
0.2
20
P-P
C
CAPACITANCE (pF)
= 18MHz), f
HD2
0.4
V
40
HD2
OUT_P-P
HD3
HD3
0.6
(V)
60
OUT_P-P
RF
GND
0.8
= f
80
LO
= 0V,
/16
100
1.0