Rainbow Electronics MAX2036 - Manual (Page 4)

MAX2036
Ultrasound VGA Integrated
with CW Octal Mixer
4 _______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS—VGA MODE
(Figure 7, V CC = V REF = 4.75V to 5.25V, V CM = (3/5)V REF , 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 = 1, CW_M1 = 0, CW_M2 = 0, VG_CLAMP_MODE = 1, f RF = f LO /16 = 5MHz, capacitance to GND at
each of the VGA differential outputs is 60pF, differential capacitance across the VGA outputs is 10pF, R L = 1kΩ, CW mixer outputs
pulled up to +11V through four separate ±0.1% 115Ω resistors, differential mixer inputs are driven from a low-impedance 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
Mode Select Response Time
CW_VG set from logic 1 to 0 or from 0 to 1
(Note 9)
2 µs
VGA MODE
Differential output
capacitance is 10pF,
capacitance to GND at
each single-ended output
is 60pF, R
L = 1k Ω
17
Large-Signal Bandwidth f-3dB
V OUT = 1.5V P-P ,
3dB bandwidth,
gain = 20dB
No capacitive load,
R
L = 1k Ω
22
MHz
Differential Input Resistance R IN 170 200 230 Ω
Input Effective Capacitance C IN f RF = 10MHz, each input to ground 15 pF
Differential Output Resistance R OUT 100 Ω
Maximum Gain 39.5 dB
Minimum Gain -10.5 dB
Gain Range 50 dB
T A = +25 °C, -2.0V < VG_CTL < -1.8V,
V REF = 5V
±0.6
T A = +25 °C, -1.8V < VG_CTL < +1.2V,
V REF = 5V
±0.5 Absolute Gain Error
T A = +25 °C, +1.2V < VG_CTL < +2.0V,
V
REF
= 5V
±1.2
dB
VGA Gain Response Time 50dB gain change to within 1dB final value 1 µs
Input-Referred Noise V G_C TL set for m axi m um g ai n, no i np ut si g nal 2 nV/√ Hz
No input signal 60
Output-Referred Noise
VG_CTL set for
+20dB of gain
V OUT = 1.5V P-P ,
1kHz offset
120
nV/√ Hz
VG_CLAMP_MODE = 1,
VG_CTL set for +20dB of gain,
f
RF = 5MHz, V OUT = 1.5V P-P
-55 -62
Second Harmonic HD2
VG_CLAMP_MODE = 1,
VG_CTL set for +20dB of gain,
f
RF = 10MHz, V OUT = 1.5V P-P
-62
dBc
Third-Order Intermodulation
Distortion
IMD3
VG_CTL set for +20dB of gain,
f
RF1 = 5MHz, f RF2 = 5.01MHz,
V OUT = 1.5V P-P , V REF = 5V (Note 3)
-40 -52 dBc
Channel-to-Channel Crosstalk
V OUT = 1V P-P differential, f RF = 10MHz,
VG_CTL set for +20dB of gain
-80 dB