(Junction to Case) (Note 1) ........................................7ºC/W
θ
JA
(Junction to Ambient) (Note 1)..................................48ºC/W
Operating Temperature Range ..........................-40ºC to +105ºC
Junction Temperature ...................................................... +150ºC
Storage Temperature Range .............................-65ºC to +165ºC
Lead Temperature (TQFN only, soldering, 10s) .............. +300ºC
Soldering Temperature (reflow) ....................................... +260ºC
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to
www.maximintegrated.com/thermal-tutorial.
CAUTION!
ESD SENSITIVE DEVICE
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
DC Electrical Characteristics
(MAX2181A
Typical Application Circuit
as shown, V
DD
= 4.75V to 5.25V, T
A
= -40ºC to +85ºC, unless otherwise noted. Typical values
are at V
DD
= 5V, T
A
= +25ºC.) (Note 2)
PARAMETER
SUPPLY VOLTAGE (V
DD
)
Supply Current
GAIN CONTROL AND AGC CONTROL (FMDET, FMGAIN, FMAGC)
FMDET
Ground
VDD
Ground
FMGAIN
Open
VDD
FMAGC
Ground
VDD
-50
50
-50
2.5
50
-65
50
µA
µA
V
µA
µA
V
DD
Operational range
4.75
5
56
5.25
68
V
mA
CONDITIONS
MIN
TYP
MAX
UNITS
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Maxim Integrated │ 2
MAX2181A
FM Automotive Low-Noise Amplifier
AC Electrical Characteristics
(MAX2181A
Typical Application Circuit,
V
DD
= 4.75V to 5.25V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
DD
= 5V,
load impedance = 50Ω, FM gain connected to ground, tuned for 87MHz to 108MHz, T
A
= +25°C.) (Note 2)
PARAMETER
Frequency Range
f
IN
= 97MHz, FMGAIN connected to V
DD
Power Gain Maximum
f
IN
= 97MHz, FMGAIN = open
f
IN
= 97MHz, FMGAIN = connected to ground
76MHz to 90MHz (Notes 3, 4)
Gain Flatness
Noise Figure
Input Return Loss
Output Return Loss
Gain-Control Range
IMD3
AGC Threshold (See Table 2)
AGC Threshold Variation
87MHz to 108MHz (Note 3)
162.5MHz relative to 97MHz
f
IN
= 97MHz, T
A
= +25ºC
50Ω source
50Ω load
f
IN
= 97MHz
V
IN
= +120dBµV/tone, +100dBµV AGC threshold,
99.5MHz and 100.5MHz tones
Minimum output threshold
Maximum output threshold
Relative to 97MHz tone (76MHz to 108MHz)
28
2.5
10
15
32
66
92
107
±0.3
CONDITIONS
MIN
76
6
5
4
8.3
7.2
6
TYP
MAX
162.5
10
9
8
0.5
0.5
3.2
dB
dB
dB
dB
dBc
dBµV
dB
dB
dB
UNITS
MHz
Note 2:
Min and max values are production tested at T
A
= -40ºC, +25ºC, and +85ºC.
Note 3:
Guaranteed by design and characterization.
Note 4:
Tuned for 76MHz to 90MHz
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Maxim Integrated │ 3
MAX2181A
FM Automotive Low-Noise Amplifier
Typical Operating Characteristics
SUPPLY CURRENT
vs. TEMPERATURE
(MAX2181A
Typical Application Circuit,
V
DD
= 5V, tuned for 87MHz - 108MHz, FM gain connected to ground, T
A
= +25°C, unless other-
wise noted.)
GAIN vs. FREQUENCY
87MHz TO 108MHz TUNING
57
56
SUPPLY CURRENT (mA)
55
GAIN (dB)
8
7
6
10
9
8
GAIN (dB)
7
6
5
4
3
200
2
50
100
GAIN vs. FREQUENCY
87MHz TO 108MHz TUNING
MAX2181A toc01
MAX2181A toc02
V
FMGAIN
= 5V
T = -40°C
T = +25°C
54
53
52
51
V
DD
= 5.25V
V
DD
= 5.0V
V
DD
= 4.75V
-50
-25
0
25
50
75
100
125
5
4
3
2
T = +105°C
T = +85°C
50
100
150
FMGAIN = HI-Z
V
FMGAIN
= 0V
150
200
TEMPERATURE (ºC)
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX2181A toc04
3.8
3.6
NOISE FIGURE (dB)
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
50
MAX2181A toc05
V
FMGAIN
= 0V
7
6
GAIN (dB)
5
4
T = -40°C
T = +25°C
9
8
GAIN (dB)
7
6
5
4
3
V
FMGAIN
= 5V
V
FMGAIN
= 5V
100
FMGAIN = HI-Z
150
200
3
2
T = +105°C
T = +85°C
50
100
150
200
FMGAIN = HI-Z
V
FMGAIN
= 0V
50
100
150
200
2
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX2181A toc07
MAX2181A toc08
108
ATTACK POINT (dBµV)
106
104
102
100
98
96
94
92
90
OUTPUT POWER, IM2, AND IM3 (dBµV)
3.8
3.6
NOISE FIGURE (dB)
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
50
R = 71kΩ
R = 62kΩ
R = 51kΩ
R = 43kΩ
R = 33kΩ
R = 22kΩ
R = 13kΩ
R = 0Ω
85
90
95
100
105
OUTPUT POWER
100
80
60
40
20
0
IM2 (A-B)
75
85
95
105
115
IM3
V
FMGAIN
= 0V
INPUT TONES AT
99MHz AND 100MHz
FMGAIN = HI-Z
V
FMGAIN
= 5V
100
150
200
FREQUENCY (MHz)
110
125
FREQUENCY (MHz)
INPUT POWER (dBµV)
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Maxim Integrated │ 4
MAX2181A toc09
4.0
NOISE FIGURE vs. FREQUENCY
76MHz TO 90MHz TUNING
110
AGC ATTACK POINT vs. FREQUENCY
87MHz TO 108MHz TUNING
OUTPUT POWER, IM2, AND IM3
vs. INPUT POWER CLOSED LOOP
120
MAX2181A toc06
4.0
NOISE FIGURE vs. FREQUENCY
87MHz TO 108MHz TUNING
8
GAIN vs. FREQUENCY
76MHz TO 90MHz TUNING
10
GAIN vs. FREQUENCY
76MHz TO 90MHz TUNING
MAX2181A toc03
MAX2181A
FM Automotive Low-Noise Amplifier
Pin Configuration
FMBYPASS
12
V
DD
13
N.C. 14
N.C. 15
N.C. 16
11
10
N.C.
9
8
FMAGC
N.C.
N.C.
N.C.
7
6
5
4
FMGAIN
TOP VIEW
MAX2181A
+
1
RBIAS
2
FMIN
3
GND
Pin Description
PIN
1
2
3
4
5–7, 9, 14–16
8
10
11
12
13
—
NAME
RBIAS
FMIN
GND
FMGAIN
N.C.
FMAGC
FMOUT
FMDET
FMBYPASS
V
DD
EP
FUNCTION
Connect a 1% tolerance 20kΩ resistor to ground.
FM Input. AC couple to FM input bandpass filter.
Ground
FM Gain Trim. Connect to ground, leave open, or connect to V
DD
for the desired FM gain.
No Connection to Die. Suggested thermal path on Layer 1 of PCB for packages exposed pad
to thermal sink.
FM AGC Control Line. Connect a 1µF capacitor to ground.
FM VGA Output
FM Attack Point Trim. Connect the desired resistor to ground.
嵌入式系统
