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Ultrasound Variable-Gain Amplifier
AC ELECTRICAL CHARACTERISTICS
(Figure 2, V CC = V REF = 4.75V to 5.25V, V CM = (3/5)V REF , V GND = 0, PD = 0, no RF signals applied, capacitance to GND at each of
the VGA differential outputs is 60pF, differential capacitance across the VGA outputs is 10pF, R L = 1k Ω , T A = 0°C to +70°C. 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
Differential output
capacitance is 10pF,
V OUT = 1.5V P-P ,
capacitance to GND at
17
Large-Signal Bandwidth
f -3dB
3dB bandwidth,
gain = 20dB
each single-ended
output is 60pF, R L = 1k Ω
MHz
No capacitive load,
R L = 1k Ω
22
Differential Input Resistance
Input Effective Capacitance
Differential Output Resistance
R IN
C IN
R OUT
f RF = 10MHz, each input to ground
170
200
15
100
230
Ω
pF
Ω
Maximum Gain
Minimum Gain
Gain Range
T A = +25 ° C, -2.0V < VG_CTL < -1.8V, V REF = 5V
39.5
-10.5
50
±0.6
dB
dB
dB
Absolute Gain Error
VGA Gain Response Time
Input-Referred Noise
T A = +25 ° C, -1.8V < VG_CTL < +1.2V, V REF = 5V
T A = +25 ° C, +1.2V < VG_CTL < +2.0V, V REF = 5V
50dB gain change to within 1dB final value
VG_CTL set for maximum gain,
no input signal
±0.5
±1.2
1
2
dB
μs
nV/ √ Hz
Output-Referred Noise
VG_CTL set for
+20dB of gain
No input signal
V OUT = 1.5V P-P ,
1kHz offset
60
120
nV/ √ Hz
VG_CLAMP_MODE = 1,
VG_CTL set for +20dB of gain,
-55
-62
Second Harmonic
HD2
f RF = 5MHz, V OUT = 1.5V P-P
VG_CLAMP_MODE = 1,
VG_CTL set for +20dB of gain,
-62
dBc
f RF = 10MHz, V OUT = 1.5V P-P
Third-Order Intermodulation
Distortion
IMD3
VG_CLT set for +20dB of gain,
f RF1 = 5MHz, f RF2 = 5.01MHz,
V OUT = 1.5V P-P , V REF = 5V (Note 4)
-40
-52
dBc
_______________________________________________________________________________________
3
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