(Junction to Case) (Note 1) ........................................7ºC/W
θ
JA
(Junction to Ambient) (Note 1)..................................48ºC/W
Operating Temperature Range ............................-40ºC to +85ºC
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
(MAX2181 Evaluation Kit as shown, V
BATT
= 8V to 15V, T
A
= -40ºC to +85ºC, unless otherwise noted. Typical values are at V
BATT
= 10V,
T
A
= +25ºC.) (Note 2)
PARAMETER
SUPPLY VOLTAGE (V
BATT
)
V
BATT
Voltage Regulation
Supply Current
Operational range
Functional range (Note 3)
V
LDO
(Pin 12)
Normal operation (V
ANTSENSE
= 0V or
6V < V
ANTSENSE
= 12V)
Antenna fault, ANTSENSE open
GAIN CONTROL AND AGC CONTROL (FMDET, FMGAIN, ANTSENSE)
Ground
ANTSENSE
Open
LDO
FMDET
Ground
LDO
Ground
FMGAIN
Open
LDO
-50
2.5
50
-65
50
-50
2.5
50
µA
V
µA
µA
µA
V
µA
15
8
15
5.1
56
68
25
10
15
24
V
V
mA
CONDITIONS
MIN
TYP
MAX
UNITS
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Maxim Integrated
│
2
MAX2181
FM Automotive Low-Noise Amplifier
AC Electrical Characteristics
(MAX2181 Evaluation Kit, V
BATT
= 8V to 15V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
BATT
= 10V, load
impedance = 50Ω, FMGAIN connected to ground, tuned for 87MHz to 108MHz, T
A
= +25°C.) (Note 2)
PARAMETER
Frequency Range
Power Gain Maximum
f
IN
= 97MHz, FMGAIN connected to V
LDO
f
IN
= 97MHz, FMGAIN open
f
IN
= 97MHz, FMGAIN connected to ground
76MHz to 90MHz (Notes 4, 5)
Gain Flatness
Noise Figure
Input Return Loss
Output Return Loss
Gain Control Range
IMD3
AGC Threshold
AGC Threshold Variation
87MHz to 108MHz (Note 4)
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
2.75
10
15
32
66
92
106
1
CONDITIONS
MIN
76
6.0
5.0
4.0
8.3
7.2
6.0
TYP
MAX
162.5
10
9.0
8.0
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
= +25ºC and +85ºC. Min and Max limits at T
A
= -40ºC are guaranteed by
design and characterization.
Note 3:
Device automatically reduces current to limit die temperature within a safe range, but otherwise remains functional.
Note 4:
Guaranteed by design and characterization.
Note 5:
Tuned for 76MHz to 90MHz.
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Maxim Integrated
│
3
MAX2181
FM Automotive Low-Noise Amplifier
Typical Operating Characteristics
(MAX2181 Evaluation Kit, V
BATT
= 10V, tuned for 87MHz to 108MHz, FMGAIN connected to ground, T
A
= +25°C, unless otherwise
noted.)
MAX2181 toc01
MAX2181 toc02
T
A
= +25°C
60
50
I
BATT
(mA)
5.25
5.20
V
LDO
(V)
T
A
= -40°C
T
A
= +105°C
T
A
= +85°C
5.5
5.0
V
LDO
(V)
4.5
4.0
3.5
T
A
= +105°C
T
A
= +85°C
T
A
= +25°C
40
30
20
10
0
5
T
A
= -40°C
T
A
= +85°C
T
A
= +105°C
5.15
5.10
5.05
5.00
T
A
= +25°C
3.0
2.5
T
A
= -40°C
10
15
V
BATT
(V)
20
25
5
10
15
V
BATT
(V)
20
25
2.0
2
4
6
8
10
12
V
BATT
(V)
MAX2181 toc04
MAX2181 toc05
7.5
7.0
6.5
GAIN (dB)
6.0
5.5
5.0
4.5
4.0
3.5
3.0
50
T
A
= +85°C
11
10
9
GAIN (dB)
8
7
6
5
4
3
2
NOISE FIGURE (dB)
T
A
= -40°C
FMGAIN = HIGH-Z
V
FMGAIN
= V
LDO
3.5
V
FMGAIN
= 0V
3.0
T
A
= +25°C T = +105°C
A
V
FMGAIN
= 0V
2.5
V
FMGAIN
= V
LDO
100
150
200
50
100
150
200
2.0
50
100
150
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX2181 toc07
OUTPUT POWER AND IM3 (dBµV)
100
80
60
40
20
0
OUTPUT POWER AND IM2 (dBµV)
100
80
60
40
20
0
IM2 (A-B)
CLOSED-LOOP OUTPUT POWER
IM3
INPUT TONES AT
99MHz AND 100MHz
CLOSED-LOOP OUTPUT POWER
INPUT TONES AT
99MHz AND 100MHz
75
85
95
105
115
125
75
85
95
105
115
125
INPUT POWER PER TONE (dBµV)
INPUT POWER PER TONE (dBµV)
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Maxim Integrated
│
4
MAX2181 toc08
120
CLOSED-LOOP OUTPUT POWER AND IM3
vs. INPUT POWER
120
CLOSED-LOOP OUTPUT POWER AND IM2
vs. INPUT POWER
MAX2181 toc06
8.0
GAIN vs. FREQUENCY
12
GAIN vs. FREQUENCY
4.0
NOISE FIGURE vs. FREQUENCY
MAX2181 toc03
70
I
BATT
vs. V
BATT
5.30
V
LDO
vs. V
BATT
6.0
V
LDO
vs. V
BATT
MAX2181
FM Automotive Low-Noise Amplifier
Pin Configuration
LDO
N.C.
9
8
FMAGC
N.C.
N.C.
N.C.
7
6
5
1
RBIAS
2
FMIN
3
ANTSENSE
4
FMGAIN
TOP VIEW
12
V
BATT
13
N.C. 14
N.C. 15
N.C. 16
FMDET
11
MAX2181
+
TQFN
Pin Description
PIN
1
2
3
4
5–7, 9, 14–16
8
10
11
12
13
—
NAME
RBIAS
FMIN
ANTSENSE
FMGAIN
N.C.
FMAGC
FMOUT
FMDET
LDO
V
BATT
EP
FUNCTION
Connect a 1% tolerance 20kΩ resistor to ground.
FM Input. AC couple to FM input bandpass filter.
Connect to antenna input connector center conductor through a 100kΩ resistor.
FM Gain Trim. Connect to ground, leave open, or connect to V
LDO
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.
DC Regulator Output. Connect a bypass capacitor to ground.
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