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Digitally Controlled, Variable-Gain, Differential
ADC Driver/Amplifier
AC ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1; V CC = +4.75V to +5.25V, GND = 0V, max gain (B0 = B1 = B2 = B3 = B4 = 0), R 1 = 1.13k Ω , P OUT = 5dBm,
f IN = 70MHz, 50 Ω system impedance. Typical values are at V CC = +5V and T A = +25°C, unless otherwise noted.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Gain Flatness Over 50MHz
Bandwidth
Attenuator Switching Time
Input Return Loss
Output Return Loss
Peak-to-peak for all settings
50% control to 90% RF
f R = 30MHz to 300MHz, all gain conditions
f R = 30MHz to 250MHz, all gain conditions
f R = 250MHz to 300MHz, all gain conditions
0.5
40
15
15
12
dB
ns
dB
dB
Note 1: Guaranteed by design and characterization.
Note 2: All limits reflect losses of external components. Output measurements are taken at RF_OUT using the application circuit
shown in Figure 1.
Note 3: The amplitude and phase unbalance are tested with 50 Ω resistors connected from OUT+/OUT- to GND.
Typical Operating Characteristics
( Circuit of Figure 1 , V CC = 5.0V, R 1 = 1.13k Ω , max gain (B0 = B1 = B2 = B3 = B4 = 0), P OUT = 5dBm, T A = +25°C, unless other-
wise noted.)
INPUT RETURN LOSS vs. RF FREQUENCY
OUTPUT RETURN LOSS vs. RF FREQUENCY
270
260
SUPPLY CURRENT vs. TEMPERATURE
V CC = 5.25V
0
5
10
(ALL STATES)
0
5
10
(ALL STATES)
250
V CC = 5.0V
15
15
240
230
220
210
V CC = 4.75V
20
25
30
35
40
20
25
30
35
40
-40
-15
10
35
60
85
30
60
90 120 150 180 210 240 270 300
30
60
90 120 150 180 210 240 270 300
25
TEMPERATURE ( ° C)
GAIN vs. RF FREQUENCY (ALL STATES)
24
FREQUENCY (MHz)
GAIN vs. RF FREQUENCY
24
FREQUENCY (MHz)
GAIN vs. RF FREQUENCY
20
15
10
5
0
-5
-10
22
20
18
16
14
12
10
T A = +25 ° C
T A = -40 ° C
T A = +85 ° C
22
20
18
16
14
12
10
V CC = 5.25V
V CC = 4.75V
V CC = 5.0V
30
60
90 120 150 180 210 240 270 300
30
60
90 120 150 180 210 240 270 300
30
60
90 120 150 180 210 240 270 300
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
_______________________________________________________________________________________
3
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