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LTC5532
1
5532i
APPLICATIO S
U
TYPICAL APPLICATIO
U
s
802.11a, 802.11b, 802.11g, 802.15
s
Multimode Mobile Phone Products
s
Optical Data Links
s
Wireless Data Modems
s
Wireless and Cable Infrastructure
s
RF Power Alarm
s
Envelope Detector
s
Temperature Compensated Internal Schottky
Diode RF Detector
s
Wide Input Frequency Range: 300MHz to 7GHz
s
Wide Input Power Range: 32dBm to 8dBm
s
Buffered Detector Output with External Gain Control
s
Precision V
OUT
Offset Control
s
Low Offset Voltage: 120mV
35mV for Gain = 2x
s
Wide V
CC
Range of 2.7V to 6V
s
Low Operating Current: 500
A
s
Available in a Low Profile (1mm) SOT-23 Package
300MHz to 7GHz
Precision RF Power Detector
with Gain and Offset Adjustment
August 2003
The LTC
5532 is an RF power detector for RF applications
operating in the 300MHz to 7GHz range. A temperature
compensated Schottky diode peak detector and buffer
amplifier are combined in a small ThinSOT
TM
package. The
supply voltage range is optimized for operation from a
single lithium-ion cell or 3xNiMH.
The RF input voltage is peak detected using an on-chip
Schottky diode. The detected voltage is buffered and
supplied to the V
OUT
pin.
The LTC5532 output buffer gain is set via external resis-
tors. The initial offset voltage of 120mV
35mV can be
precisely adjusted using the V
OS
pin.
The LTC5532 operates with input power levels from
32dBm to 8dBm.
, LTC and LT are registered trademarks of Linear Technology Corporation.
300MHz to 7GHz RF Power Detector
LTC5532
1
2
3
6
5
4
100pF
0.1
F
V
CC
V
OS
REFERENCE
V
CC
V
OUT
RF
IN
GND
V
OS
33pF
5532 TA01
RF
INPUT
V
M
R
A
R
B
Output Voltage vs RF Input Power
V
OUT
OUTPUT VOLTAGE (mV)
3600
3200
2800
2400
2000
1600
1200
800
400
0
RF INPUT POWER (dBm)
5532 TA02
32 27 22 17 12 7
2
3
8
V
CC
= 3.6V
T
A
= 25
C
GAIN = 2
V
OS
= 0V
7000MHz
6000MHz
5000MHz
1000MHz
3000MHz
4000MHz
2000MHz
300MHz
ThinSOT is a trademark of Linear Technology Corporation.
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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Final Electrical Specifications
FEATURES
DESCRIPTIO
U
LTC5532
2
5532i
V
CC
, V
OUT
, V
M
, V
OS ..........................................
0.3V to 6.5V
RF
IN
Voltage .........................................(V
CC
1V) to 7V
I
VOUT
...................................................................... 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
ABSOLUTE AXI U
RATI GS
W
W
W
U
PACKAGE/ORDER I FOR ATIO
U
U
W
(Note 1)
ELECTRICAL CHARACTERISTICS
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25
C. V
CC
= 3.6V, RF Input Signal is Off, R
A
= R
B
= 1k, V
OS
= 0V unless
otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
CC
Operating Voltage
q
2.7
6
V
I
VCC
Operating Current
I
VOUT
= 0mA
q
0.5
0.7
mA
V
OUT
V
OL
(No RF Input)
R
LOAD
= 2k, V
OS
= 0V
q
85
100 to 140
155
mV
V
OUT
Output Current
V
OUT
= 1.75V, V
CC
= 2.7V,
V
OUT
< 10mV
q
2
4
mA
V
OUT
Bandwidth
C
LOAD
= 33pF, R
LOAD
= 2k (Note 4)
2
MHz
V
OUT
Load Capacitance
(Note 6)
q
33
pF
V
OUT
Slew Rate
V
RFIN
= 1V Step, C
LOAD
= 33pF, Total R
LOAD
= 2k (Note 3)
3
V/
s
V
OUT
Noise
V
CC
= 3V, Noise BW = 1.5MHz, 50
RF Input Termination,
1
mV
P-P
50
AC Output Termination
V
OS
Voltage Range
q
0
1
V
V
OS
Input Current
V
OS
= 1V
q
0.5
0.5
A
V
M
Voltage Range
q
0
V
CC
-1. 8
V
V
M
Input Current
V
M
= 3.6V
q
0.5
0.5
A
RF
IN
Input Frequency Range
300 to 7000
MHz
RF
IN
Input Power Range
RF Frequency = 300MHz to 7GHz (Note 5, 6) V
CC
= 2.7V to 6V
32 to 8
dBm
RF
IN
AC Input Resistance
F = 1000MHz, Pin = 25dBm
220
RF
IN
Input Shunt Capacitance
F = 1000MHz, Pin = 25dBm
0.65
pF
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ORDER PART
NUMBER
S6 PART
MARKING
T
JMAX
= 125
C,
JA
= 250
C/W
LTAFS
LTC5532ES6
6 V
CC
5 V
OUT
4 V
M
RF
IN
1
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
GND 2
V
OS
3
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 V
OUT
is measured between 1.3V and 2.3V.
Note 4: Bandwidth is calculated based on 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.
LTC5532
3
5532i
V
OUT
OUTPUT VOLTAGE (mV)
3600
3200
2800
2400
2000
1600
1200
800
400
0
RF INPUT POWER (dBm)
5532 G01
32 28 24 20 16 12 8 4
0
4
8
V
CC
= 3.6V
T
A
= 40
C
T
A
= 85
C
T
A
= 25
C
V
OUT
OUTPUT VOLTAGE (mV)
3600
3200
2800
2400
2000
1600
1200
800
400
0
RF INPUT POWER (dBm)
5532 G02
32 28 24 20 16 12 8 4
0
4
8
V
CC
= 3.6V
T
A
= 40
C
T
A
= 85
C
T
A
= 25
C
V
OUT
OUTPUT VOLTAGE (mV)
3600
3200
2800
2400
2000
1600
1200
800
400
0
RF INPUT POWER (dBm)
5532 G03
32 28 24 20 16 12 8 4
0
4
8
V
CC
= 3.6V
T
A
= 40
C
T
A
= 85
C
T
A
= 25
C
V
OUT
OUTPUT VOLTAGE (mV)
3600
3200
2800
2400
2000
1600
1200
800
400
0
RF INPUT POWER (dBm)
5532 G06
32 28 24 20 16 12 8 4
0
4
8
V
CC
= 3.6V
T
A
= 40
C
T
A
= 85
C
V
OUT
OUTPUT VOLTAGE (mV)
3600
3200
2800
2400
2000
1600
1200
800
400
0
RF INPUT POWER (dBm)
5532 G05
32 28 24 20 16 12 8 4
0
4
8
V
CC
= 3.6V
T
A
= 40
C
T
A
= 85
C
T
A
= 25
C
V
OUT
OUTPUT VOLTAGE (mV)
3600
3200
2800
2400
2000
1600
1200
800
400
0
RF INPUT POWER (dBm)
5532 G04
32 28 24 20 16 12 8 4
0
4
8
V
CC
= 3.6V
T
A
= 40
C
T
A
= 85
C
T
A
= 25
C
SUPPLY VOLTAGE (V)
2.5
130
125
120
115
110
5.0
5532 G1a
4.5
3.5
5.5
4.0
3.0
6.0
V
OUT
OUTPUT VOLTAGE (mV)
V
OS
= 0V
GAIN = 2
T
A
= 85
C
T
A
= 25
C
T
A
= 40
C
SUPPLY VOLTAGE (V)
2.5
500
480
460
440
420
5.0
5532 G2a
4.5
3.5
5.5
4.0
3.0
6.0
SUPPLY CURRENT (mA)
T
A
= 85
C
T
A
= 25
C
T
A
= 40
C
RF INPUT POWER (dBm)
10
OUTPUT DELAY (ns)
10
5532 G23
5
0
5
1000
800
600
400
200
0
V
CC
= 3.6V
T
A
= 25
C
V
OS
= 0V
GAIN = 2
90% SWITCHING
50% SWITCHING
T
A
= 25
C
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
Output Delay vs RF Input Power
Typical Detector Characteristics,
300MHz, Gain = 2, V
OS
= 0V
Typical Detector Characteristics,
1000MHz, Gain = 2, V
OS
= 0V
Typical Detector Characteristics,
2000MHz, Gain = 2, V
OS
= 0V
Typical Detector Characteristics,
3000MHz, Gain = 2, V
OS
= 0V
Typical Detector Characteristics,
4000MHz, Gain = 2, V
OS
= 0V
Typical Detector Characteristics,
5000MHz, Gain = 2, V
OS
= 0V
Output Voltage vs Supply Voltage
(RF Input Signal Off)
Supply Current vs Supply Voltage
(RF Input Signal Off)
(R
LOAD
= 20k)
LTC5532
4
5532i
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
(R
LOAD
= 20k)
V
OUT
OUTPUT VOLTAGE (mV)
3600
3200
2800
2400
2000
1600
1200
800
400
0
RF INPUT POWER (dBm)
5532 G11
32 28 24 20 16 12 8 4
0
4
8
V
CC
= 3.6V
T
A
= 40
C
T
A
= 85
C
T
A
= 25
C
V
OUT
OUTPUT VOLTAGE (mV)
3600
3200
2800
2400
2000
1600
1200
800
400
0
RF INPUT POWER (dBm)
5532 G12
32 28 24 20 16 12 8 4
0
4
8
V
CC
= 3.6V
T
A
= 25
C
V
OUT
OUTPUT VOLTAGE (mV)
3600
3200
2800
2400
2000
1600
1200
800
400
0
RF INPUT POWER (dBm)
5532 G13
32 28 24 20 16 12 8 4
0
4
8
V
OUT
OUTPUT VOLTAGE (mV)
3600
3200
2800
2400
2000
1600
1200
800
400
0
RF INPUT POWER (dBm)
5532 G14
32 28 24 20 16 12 8 4
0
4
8
V
OS
= 1V
V
OS
= 0.5V
V
OS
= 0.2V
V
OS
= 0V
V
OS
= 1V
V
OS
= 0.5V
V
OS
= 0.2V
V
OS
= 0V
300MHz
GAIN = 4
1000MHz
GAIN = 2
1000MHz
GAIN = 4
300MHz
GAIN = 2
V
OUT
OUTPUT VOLTAGE (mV)
3600
3200
2800
2400
2000
1600
1200
800
400
0
RF INPUT POWER (dBm)
5532 G08
32 27 22 17 12 7
2
3
8
V
CC
= 3.6V
T
A
= 40
C
T
A
= 85
C
T
A
= 25
C
V
OUT
OUTPUT VOLTAGE (mV)
3600
3200
2800
2400
2000
1600
1200
800
400
0
RF INPUT POWER (dBm)
5532 G10
32 28 24 20 16 12 8 4
0
4
8
V
CC
= 3.6V
T
A
= 40
C
T
A
= 85
C
T
A
= 25
C
V
CC
= 3.6V
T
A
= 25
C
V
CC
= 3.6V
T
A
= 25
C
V
OUT
OUTPUT VOLTAGE (mV)
3600
3200
2800
2400
2000
1600
1200
800
400
0
RF INPUT POWER (dBm)
5532 G07
32 28 24 20 16 12 8 4
0
4
8
V
CC
= 3.6V
T
A
= 40
C
T
A
= 85
C
T
A
= 25
C
Typical Detector Characteristics,
300MHz, Gain = 4, V
OS
= 0V
Typical Detector Characteristics,
1000MHz, Gain = 4, V
OS
= 0V
V
OUT
vs RF Input Power and V
OS
,
300MHz, Gain = 2
V
OUT
vs RF Input Power and V
OS
,
1000MHz, Gain = 2
Typical Detector Characteristics,
6000MHz, Gain = 2, V
OS
= 0V
Typical Detector Characteristics,
7000MHz, Gain = 2, V
OS
= 0V
V
OUT
vs RF Input Power, 300MHz
and 1000MHz, Gain = 2 and 4,
V
OS
= 0V
LTC5532
5
5532i
RF INPUT POWER (dBm)
30
V
OUT
SLOPE (mV/dB)
1000
100
10
1
25
5
5532 G15
20
15
10
0
5
V
CC
= 3.6V
GAIN = 2
V
OS
= 0V
T
A
= 40
C
T
A
= 85
C
T
A
= 25
C
RF INPUT POWER (dBm)
30
V
OUT
SLOPE (mV/dB)
1000
100
10
1
25
5
5532 G16
20
15
10
0
5
T
A
= 40
C
T
A
= 85
C
RF INPUT POWER (dBm)
30
V
OUT
SLOPE (mV/dB)
1000
100
10
1
25
5
5532 G17
20
15
10
0
5
T
A
= 40
C
T
A
= 85
C
RF INPUT POWER (dBm)
30
V
OUT
SLOPE (mV/dB)
1000
100
10
1
25
5
5532 G18
20
15
10
0
5
T
A
= 40
C
T
A
= 85
C
RF INPUT POWER (dBm)
30
V
OUT
SLOPE (mV/dB)
1000
100
10
1
25
5
5532 G19
20
15
10
0
5
T
A
= 40
C
T
A
= 85
C
RF INPUT POWER (dBm)
30
V
OUT
SLOPE (mV/dB)
1000
100
10
1
25
5
5532 G20
20
15
10
0
5
T
A
= 40
C
T
A
= 85
C
RF INPUT POWER (dBm)
30
V
OUT
SLOPE (mV/dB)
1000
100
10
1
25
5
5532 G21
20
15
10
0
5
T
A
= 40
C
T
A
= 85
C
RF INPUT POWER (dBm)
30
V
OUT
SLOPE (mV/dB)
1000
100
10
1
25
5
5532 G22
20
15
10
0
5
T
A
= 40
C
T
A
= 85
C
T
A
= 25
C
T
A
= 25
C
T
A
= 25
C
T
A
= 25
C
T
A
= 25
C
T
A
= 25
C
T
A
= 25
C
V
CC
= 3.6V
GAIN = 2
V
OS
= 0V
V
CC
= 3.6V
GAIN = 2
V
OS
= 0V
V
CC
= 3.6V
GAIN = 2
V
OS
= 0V
V
CC
= 3.6V
GAIN = 2
V
OS
= 0V
V
CC
= 3.6V
GAIN = 2
V
OS
= 0V
V
CC
= 3.6V
GAIN = 2
V
OS
= 0V
V
CC
= 3.6V
GAIN = 2
V
OS
= 0V
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
V
OUT
Slope vs RF Input Power
at 300MHz
V
OUT
Slope vs RF Input Power
at 1GHz
V
OUT
Slope vs RF Input Power
at 2GHz
V
OUT
Slope vs RF Input Power
at 3GHz
V
OUT
Slope vs RF Input Power
at 4GHz
V
OUT
Slope vs RF Input Power
at 5GHz
V
OUT
Slope vs RF Input Power
at 6GHz
V
OUT
Slope vs RF Input Power
at 7GHz
(R
LOAD
= 20k)
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