LTC5509 - 300MHz to 3GHz RF Power Detector in SC70 Package

LTC5509
300MHz to 3GHz
RF Power Detector
in SC70 Package
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FEATURES
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DESCRIPTIO
Temperature Compensated Internal Schottky Diode
RF Detector
Wide Input Frequency Range: 300MHz to 3GHz
Wide Input Power Range: –30dBm to 6dBm
Buffered Detector Output
Wide VCC Range of 2.7V to 6V
Low Operating Current: 600µA
Low Shutdown Current: <2µA
SC70 Package
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APPLICATIO S
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Multimode Mobile Phone Products
Optical Data Links
Wireless Data Modems
Wireless and Cable Infrastructure
RF Power Alarm
Envelope Detector
The RF input voltage is peak detected using an on-chip
Schottky diode. The detected voltage is buffered and
supplied to the VOUT pin without gain compression. Consequently, the output voltage is linearly proportional to the
RF input voltage. A power saving shutdown mode reduces
supply current to less than 2µA.
The LTC5509 operates with input power levels from
–30dBm to 6dBm.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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The LTC®5509 is an RF power detector for RF applications
operating in the 300MHz to 3GHz range. A temperature
compensated Schottky diode peak detector and buffer
amplifier are combined in a small SC70 package. The
supply voltage range is optimized for operation from a
single lithium-ion cell or 3xNiMH.
TYPICAL APPLICATIO
Output Voltage vs RF Input Power
300MHz to 3GHz RF Power Detector
RF
INPUT
33pF
6
2
DISABLE ENABLE
1
LTC5509
VCC 4
RFIN
5
GND
GND
SHDN
VOUT 3 VOUT
VCC
100pF
0.1µF
5509 TA01
VOUT OUTPUT VOLTAGE (mV)
3000
VCC = 3.6V
TA = 25°C
2500
850MHz
1.85GHz
2000
3GHz
1500
1000
500
0
0
–30 –25 –20 –15 –10 –5
RF INPUT POWER (dBm)
5
10
5509 TA02
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LTC5509
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ABSOLUTE
RATI GS
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PACKAGE/ORDER I FOR ATIO
(Note 1)
VCC, VOUT to GND .................................... –0.3V to 6.5V
RFIN Voltage .........................................(VCC ± 1V) to 7V
SHDN Voltage to GND ................ –0.3V to (VCC + 0.3V)
IVOUT ...................................................................... 5mA
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Maximum Junction Temperature ......................... 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART
NUMBER
TOP VIEW
SHDN 1
6 RFIN
GND 2
5 GND
VOUT 3
4 VCC
LTC5509ESC6
SC6 PART
MARKING
SC6 PACKAGE
6-LEAD PLASTIC SC70
TJMAX = 125°C, θJA = 256°C/W
LADD
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 3.6V, SHDN = VCC = HI, SHDN = 0V = LO, RF Input Signal is Off,
unless otherwise noted.
PARAMETER
CONDITIONS
MIN
VCC Operating Voltage
●
IVCC Shutdown Current
SHDN = LO
●
IVCC Operating Current
SHDN = HI, IVOUT = 0mA
●
VOUT VOL (No RF Input)
RLOAD = 2k, SHDN = HI, Enabled
SHDN = LOW, Disabled
VOUT Output Current
VOUT = 1.75V, VCC = 2.7V, ∆VOUT = 10mV
●
VOUT Enable Time
SHDN = HI, CLOAD = 33pF, RLOAD = 2k
●
VOUT Bandwidth
CLOAD = 33pF, RLOAD = 2k (Note 4)
VOUT Load Capacitance
(Note 6)
TYP
2.7
MAX
UNITS
6
V
2
µA
0.58
0.85
mA
150
250
1
400
mV
mV
1
2
8
mA
20
1.5
33
●
µs
MHz
pF
VOUT Slew Rate
VRFIN = 0.7V Step, CLOAD = 33pF, RLOAD = 2k (Note 3)
8
V/µs
VOUT Noise
VCC = 3V, Noise BW = 1.5MHz, 50Ω RF Input Termination
2
mVP-P
SHDN Voltage, Chip Disabled
VCC = 2.7V to 6V
●
SHDN Voltage, Chip Enabled
VCC = 2.7V to 6V
●
SHDN Input Current
SHDN = 3.6V
●
RFIN Input Frequency Range
0.35
V
40
µA
1.4
V
24
300 to 3000
MHz
–30 to 6
dBm
RFIN Input Power Range
RF Frequency = 300MHz to 3GHz (Note 5, 6)
RFIN AC Input Resistance
F = 300MHz, Pin = –25dBm
150
Ω
RFIN Input Shunt Capacitance
F = 300MHz, Pin = –25dBm
0.9
pF
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Specifications over the –40°C to 85°C operating temperature
range are assured by design, characterization and correlation with
statistical process controls.
Note 3: The rise time at VOUT is measured between VOUT/2 + 0.5V to
VOUT/2 – 0.5V.
Note 4: Bandwidth is calculated using the 10% to 90% rise time equation:
BW = 0.35/rise time.
Note 5: RF performance is tested at 1800MHz
Note 6: Guaranteed by design.
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LTC5509
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TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage vs Supply Voltage
(RF Input Signal Off)
Supply Current vs Supply Voltage
3000
305
600
TA = –40°C
TA = 25°C
TA = 85°C
550
3
5
3.5
4
4.5
SUPPLY VOLTAGE (V)
5.5
295
TA = 25°C
TA = 85°C
290
2.5
3
5
3.5
4
4.5
SUPPLY VOLTAGE (V)
5.5
5509 G01
VOUT OUTPUT VOLTAGE (mV)
2500
2000
TA = 25°C
1500
TA = –40°C
1000
TA = 85°C
500
0
0
–30 –25 –20 –15 –10 –5
RF INPUT POWER (dBm)
5
5
10
5509 G03
VOUT Slope vs RF Input Power at
850MHz
1000
VCC = 3.6V
2500
100
2000
TA = 25°C
1500
TA = –40°C
1000
TA = 85°C
10
TA = –40°C
0
0
–30 –25 –20 –15 –10 –5
RF INPUT POWER (dBm)
10
5
TA = 85°C
TA = 25°C
500
1
–30 –25 –20
10
–15
–10
–5
0
5
RF INPUT POWER (dBm)
5509 G05
5509 G06
VOUT Slope vs RF Input Power at
3000MHz
VOUT Slope vs RF Input Power at
1850MHz
1000
VOUT SLOPE (mV/dB)
VCC = 3.6V
VCC = 3.6V
100
100
10
TA = 85°C
500
6
VCC = 3.6V
5509 G04
VOUT SLOPE (mV/dB)
VOUT OUTPUT VOLTAGE (mV)
3000
1000
TA = –40°C
1000
Typical Detector Characteristics,
3000MHz
VCC = 3.6V
0
0
–30 –25 –20 –15 –10 –5
RF INPUT POWER (dBm)
TA = 25°C
1500
5509 G02
Typical Detector Characteristics,
1850MHz
3000
2000
285
6
VCC = 3.6V
2500
VOUT SLOPE (mV/dB)
2.5
TA = –40°C
300
VOUT OUTPUT VOLTAGE (mV)
VOUT OUTPUT VOLTAGE (mV)
SUPPLY CURRENT (µA)
650
Typical Detector Characteristics,
850MHz
TA = –40°C
TA = 85°C
10
TA = –40°C
TA = 25°C
TA = 25°C
1
–30 –25 –20
–15
–10
TA = 85°C
–5
0
5
1
–30 –25 –20
–15
–10
–5
0
5
RF INPUT POWER (dBm)
RF INPUT POWER (dBm)
5509 G07
5509 G08
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LTC5509
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TYPICAL PERFOR A CE CHARACTERISTICS
RFIN Input Impedance (Pin = 0dBm, VCC = 3.6V, TA = 25°C)
PNT
#
FREQUENCY
(GHz)
RESISTANCE
(Ω)
REACTANCE
(Ω)
1
0.300
185.434
– 62.632
2
0.468
173.804
– 65.491
3
0.637
161.644
– 71.893
4
0.806
149.450
– 76.830
5
0.975
137.402
– 79.300
6
1.143
126.251
– 81.429
7
1.312
114.165
– 84.108
8
1.481
100.350
– 83.547
9
1.650
89.015
– 80.053
10
1.818
80.586
– 74.762
11
1.987
73.674
– 70.242
12
2.156
67.737
– 66.323
13
2.325
62.354
– 61.497
14
2.493
57.833
– 57.213
15
2.662
53.701
– 53.443
16
2.831
50.166
– 48.992
17
3.000
47.094
– 44.997
RFIN Input Impedance (Pin = –25dBm, VCC = 3.6V, TA = 25°C)
PNT
#
FREQUENCY
(GHz)
RESISTANCE
(Ω)
REACTANCE
(Ω)
1
0.300
146.073
– 48.091
2
0.468
140.112
– 44.500
3
0.637
133.522
– 46.654
4
0.806
127.142
– 50.559
5
0.975
120.560
– 52.094
6
1.143
114.518
– 53.472
7
1.312
107.427
– 58.362
8
1.481
96.348
– 61.184
9
1.650
86.158
– 59.226
10
1.818
79.014
– 55.746
11
1.987
73.054
– 52.613
12
2.156
67.785
– 49.515
13
2.325
63.701
– 46.430
14
2.493
59.598
– 43.378
15
2.662
55.559
– 40.355
16
2.831
52.713
– 37.150
17
3.000
49.898
– 34.268
S11 Forward Reflection
Impedance
0.300000GHz TO 3.000000GHz
5509 TA03
S11 Forward Reflection
Impedance
0.300000GHz TO 3.000000GHz
5509 TA04
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LTC5509
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PI FU CTIO S
SHDN (Pin 1): Shutdown Input. A logic low on the SHDN
pin places the part in shutdown mode. A logic high enables
the part. SHDN has an internal 150k pull down resistor to
ensure that the part is in shutdown when no input is
applied.
GND (Pin 2, 5): Ground.
VOUT (Pin 3): Detector Output.
VCC (Pin 4): Power Supply Voltage, 2.7V to 6V. VCC should
be bypassed appropriately with ceramic capacitors.
RFIN (Pin 6): RF Input Voltage. Referenced to VCC. A
coupling capacitor must be used to connect to the RF
signal source. The frequency range is 300MHz to 3GHz.
This pin has an internal 250Ω termination, an internal
Schottky diode detector and a peak detector capacitor.
W
BLOCK DIAGRA
RFSOURCE
33pF TO 200pF
(DEPENDING ON
APPLICATION)
VCC
4
+
BUFFER
3
VOUT
–
30k
250Ω
RFIN
6
30k
27k
28pF
27k
60µA
100Ω
100Ω
+
RF DET
130mV
–
40k
60µA
BIAS
150k
GND 2
GND 5
1
5509 BD
SHDN
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LTC5509
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APPLICATIO S I FOR ATIO
Operation
The LTC5509 RF detector integrates several functions to
provide RF power detection over frequencies ranging from
300MHz to 3GHz. These functions include an internally
compensated buffer amplifier, an RF Schottky diode peak
detector and level shift amplifier to convert the RF feedback
signal to DC and a delay circuit to avoid voltage transients
at VOUT when coming out of shutdown. The LTC5509 does
not incorporate gain compression. Consequently, it offers
a linear transfer relationship between RF input voltage and
DC output voltage.
Buffer Amplifier
The buffer amplifier is capable of driving a 2mA load. The
buffer amplifier typically has an output voltage range of
0.25V to 3V with VCC = 3.6V. At lower supply voltages the
maximum output swing is reduced.
The Schottky detector is biased at about 60µA and drives
a peak detector capacitor of 28pF.
Modes of Operation
MODE
SHDN
OPERATION
Shutdown
Low
Disabled
Enable
High
Power Detect
Applications
The LTC5509 can be used as a self-standing signal strength
measuring receiver for a wide range of input signals from
–30dBm to 6dBm for frequencies from 300MHz to 3GHz.
RF Detector
The LTC5509 can be used as a demodulator for AM and
ASK modulated signals with data rates up to 1.5MHz.
Depending on specific application needs, the RSSI output
can be split into two branches, providing AC-coupled data
(or audio) output and DC-coupled, RSSI output for signal
strength measurements and AGC.
The internal RF Schottky diode peak detector and level
shift amplifier converts the RF input signal to a low
frequency signal. The detector demonstrates excellent
efficiency and linearity over a wide range of input power.
The LTC5509 can be used for RF power detection and
control. Refer to Application Note 91, “Low Cost Coupling
Methods for RF Power Detectors Replace Directional
Couplers.”
Demo Board Schematic
VCC
R3
22k
E4
SHDN
C1
33pF
ENABLE 1
2
DISABLE 3
JP1
VOUT
E2
E3
GND
R2
68Ω
(OPT)
C5
(OPT)
GND
GND
VOUT
VCC
RFIN
J1
SHDN
RF
LTC5509
R1
68Ω
(OPT)
VCC
E1
VCC
C2
0.1µF
C3
100pF
E5
GND
5509 AI01
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LTC5509
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PACKAGE DESCRIPTIO
SC6 Package
6-Lead Plastic SC70
(Reference LTC DWG # 05-08-1638)
0.47
MAX
0.65
REF
1.80 – 2.20
(NOTE 4)
1.16 REF
0.96 MIN
3.26 MAX 2.1 REF
INDEX AREA
(NOTE 6)
1.80 – 2.40 1.15 – 1.35
(NOTE 4)
PIN 1
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.65 BSC
0.15 – 0.30
6 PLCS (NOTE 3)
0.10 – 0.40
0.80 – 1.00
0.00 – 0.10
REF
1.00 MAX
0.10 – 0.30
0.10 – 0.18
(NOTE 3)
SC6 SC70 0802
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. DETAILS OF THE PIN 1 INDENTIFIER ARE OPTIONAL,
BUT MUST BE LOCATED WITHIN THE INDEX AREA
7. EIAJ PACKAGE REFERENCE IS EIAJ SC-70
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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LTC5509
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Linear Technology Corporation
LT/TP 0203 2K • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2003