Datasheet

MAX2078
Octal-Channel Ultrasound Front-End
with CW Doppler Mixers
_______________________________________________________________________________________ 7
AC ELECTRICAL CHARACTERISTICS—CW MODE (continued)
( Typical Application Circuit , V/C = 0, PD = 0, NP = 0, CLP = 0, D43/D42/D41/D40 = 1/0/1/0 (R
IN
= 200Ω, LNA gain = 18.5dB), f
RF
=
f
LO
/16 = 5MHz, R
S
= 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 (Note 12). Typical values are at
V
CC1
= 3.3V, V
CC2
= 4.75V, T
A
= +25°C, unless otherwise noted.) (Note 5)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Two-Tone Intermodulation IMD3
at 100mV
f
RF1
= 5MHz, 0.1V
P-P,
f
RF2
= 5.01MHz at -25dBc,
f
LO
= 80MHz (Note 11)
-50 -55 dBc
Two-Tone Intermodulation IMD3
at 200mV
f
RF1
= 5MHz, 0.2V
P-P
, f
RF2
= 5.01MHz at -25dBc,
f
LO
= 80MHz (Note 11)
-48.5 dBc
Mixer Output-Voltage
Compliance
Valid voltage range (AC + DC) on summed mixer output
pins
4.5 12 V
Channel-to-Channel Phase
Matching
Measured under zero beat conditions, V
RF
= 100mV
P-P
,
f
RF
= 5MHz, f
LO
= 80MHz (Note 13)
±0.4 D eg r ees
Channel-to-Channel Gain
Matching
Measured under zero beat conditions, V
RF
= 100mV
P-P
,
f
RF
= 5MHz, f
LO
= 80MHz (Notes 13, 14)
±0.2 dB
f
RF
= 0.9MHz,
f
LO
/16 = 1MHz
19 23 26
Transconductance
Calculated from LNA input voltage
and twice the I or Q current
f
RF
= 7.6MHz,
f
LO
/16 = 7.5MHz
19 22.5 26
mS
LOW-POWER MODE (CLP = 1)
Noise Figure No carrier 3.2 dB
Noise Figure at 100mV
P-P
Input
100mV
P-P
on input, f
RF
= f
LO
/16 = 1.25MHz, measured
at 1kHz offset
3.5 dB
Noise Figure at 200mV
P-P
Input
200mV
P-P
on input, f
RF
= f
LO
/16 = 1.25MHz, measured
at 1kHz offset
4.3 dB
SNR at 100mV
P-P
Input
100mV
P-P
on input, f
RF
= f
LO
/16 = 1.25MHz, measured
at 1kHz offset
-148.2 dBc/Hz
SNR at 200mV
P-P
Input
200mV
P-P
on input, f
RF
= f
LO
/16 = 1.25MHz, measured
at 1kHz offset
-153.6 dBc/Hz
Two-Tone Intermodulation IMD3
f
RF1
= 5MHz, 0.1V
P-P
, f
RF2
= 5.01MHz at -25dBc,
f
LO
= 80MHz (Note 11)
-44 dBc
M i xer O utp ut- V ol tag e C om p l i ance V al i d vol tag e r ang e on sum m ed m i xer outp ut p i ns ( N ote 12) 4.5 12 V
f
RF
= 1.1MHz,
f
LO
/16 = 1MHz
19 21.5 26
Transconductance (Note 16)
Calculated from LNA input voltage
and twice the I or Q current
f
RF
= 7.6MHz,
f
LO
/16 = 7.5MHz
19 21.5 26
mS