Ac electrical characteristics—cw mixer mode – Rainbow Electronics MAX2038 User Manual
Page 5
MAX2038
Ultrasound VGA Integrated
with CW Octal Mixer
_______________________________________________________________________________________
5
AC ELECTRICAL CHARACTERISTICS—CW MIXER MODE
(
Typical Application Circuit, Figure 7. V
CC
= V
REF
= 4.75V to 5.25V, T
A
= 0
°C to +70°C, V
GND
= 0, LOW_PWR = 0, M4_EN = 0,
CW_FILTER = 1, TMODE = 0, PD = 0, CW_VG = 0, CW_M1 = 0, CW_M2 = 0, VG_CLAMP_MODE = 1, f
RF
= f
LO
/16 = 5MHz, capaci-
tance to GND at each of the VGA differential outputs is 60pF, differential capacitance across the VGA outputs is 10pF, R
L
= 1k
Ω, CW
mixer outputs pulled up to +11V through four separate ±0.1% 115
Ω resistors, differential mixer inputs are driven from a low imped-
ance source. Typical values are at V
CC
= V
REF
= 5V, T
A
= +25
°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Maximum Output Voltage at
ClampOFF
VG_CLAMP_MODE = 1, VG_CTL set for
+20dB of gain, 350mV
P-P
differential input
2.8
V
P-P
d i ffer enti al
CW MIXER MODE
Mixer RF Frequency Range
0.9
7.6
MHz
Mixer LO Frequency Range
1
7.5
MHz
Mixer IF Frequency Range
100
kHz
Maximum Input Voltage Range
1.8
V
P-P
d i ffer enti al
CW_FILTER = 0
633
Differential Input Resistance
CW_FILTER = 1
1440
Ω
M od e 3, f
RF
= f
LO
/4 = 1.25M H z, m easur ed at a
1kH z offset fr eq uency; cl utter tone at 0.9V
P - P
d i ffer enti al m easur ed at the m i xer i np ut
6
Input-Referred Noise Voltage
M od e 3, RF ter m i nated i nto 50
Ω; f
L O
/4 =
1.25M H z, m easur ed at 1kH z offset
4.6
nV/√Hz
Third-Order Intermodulation
Distortion
IMD3
M od e 1, f
RF 1
= 5M H z at 0.9V
P - P
d i ffer enti al
i np ut, D op p l er tone f
RF 2
= 5.01M H z at 25d Bc
fr om cl utter tone, f
LO
/16 = 5M H z ( N ote 10)
-50
dBc
M i xer O utp ut V ol tag e C om p l i ance
(Note 11)
4.75
12
V
Channel-to-Channel Phase
Matching
Measured under zero beat conditions,
f
RF
= 5MHz, f
LO
/16 = 5MHz (Note 12)
±3.0
Degrees
Channel-to-Channel Gain
Matching
Measured under zero beat conditions,
f
RF
= 5MHz, f
LO
/16 = 5MHz (Note 12)
±2
dB
CW_FILTER = 1
2.8
Transconductance (Note 13)
CW FILTER = 0
f
RF
= 1.1MHz, 1V
P - P
d i ffer enti al , f
LO
/16 = 1MHz
2.8
mS