LTC5536
600MHz to 7GHz
Precision RF Detector with
Fast Comparator Output
FEATURES
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DESCRIPTIO
Temperature Compensated Internal Schottky
Diode RF Detector
Wide Input Frequency Range: 600MHz to 7GHz*
Wide Input Power Range: –26dBm to 12dBm
Fast Comparator Output with Latch Enable
25ns Response Time with 0dBm RF Input Level
Rail-to-Rail Output Swing
Comparator Output Current:
±20mA
Wide V
CC
Range of 2.7V to 5.5V
Low Operating Current: 2mA
Available in a Low Profile (1mm) SOT-23 Package
The LTC
®
5536 is an RF power detector for RF applications
operating in the 600MHz to 7GHz range. A temperature
compensated Schottky diode peak detector and fast com-
parator are combined in a small ThinSOT
TM
package. The
supply voltage range is optimized for operation from a
single cell lithium-ion or three cell NiMH battery.
The RF input voltage is peak detected using an on-chip
Schottky diode. The detected voltage is compared against
a reference voltage at V
M
.
The response time from the RF input to V
OUT
can be as little
as 20ns. The comparator output is latched when LEN is
high or is transparent when LEN is low.
The LTC5536 operates with RF input power levels from
–26dBm to 12dBm.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
*Operation at higher frequencies is possible with reduced performance.
APPLICATIO S
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RF Signal Presence Detectors for:
802.11a, 802.11b, 802.11g, 802.15
Optical Data Links
Wireless Data Modems
Wireless and Cable Infrastructure
RF Power Alarm
Envelope Detector
RF ID Tag Reader
TYPICAL APPLICATIO
V
M
Comparator Switching Voltage
vs RF Input Power, 600MHz – 7GHz
3200
2800
600MHz
1000MHz
2000MHz
3000MHz
4000MHz
5000MHz
6000MHz
7000MHz
V
CC
= 3.6V
V
LEN
= 0V
T
A
= 25°C
600MHz to 7GHz RF Power Detector
V
M
SWITCHING VOLTAGE (mV)
33pF
RF
INPUT
1
2400
2000
1600
1200
800
400
LTC5536
V
CC
6
RF
IN
100pF
5
V
CC
0.1µF
2
GND
V
OUT
V
M
3 V
M
REFERENCE
LEN
5536 TA01
4
DISABLE ENABLE
0
–28 –24 –20 –16 –12 –8 –4 0 4
INPUT RF POWER (dBm)
U
8
12
5536 TA01b
U
U
5536f
1
LTC5536
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
RF
IN
1
GND 2
V
M
3
6 V
CC
5 V
OUT
4 LEN
V
CC
, V
OUT
, V
M
, LEN .................................... –0.3V to 6V
RF
IN
Voltage ...................................(V
CC
±
1.5V) to 6.5V
I
VOUT
..................................................................
±25mA
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
LTC5536ES6
S6 PART
MARKING
LBDS
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C,
θ
JA
= 250°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The
●
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, V
M
= 160mV unless otherwise noted.
PARAMETER
V
CC
Operating Voltage
I
VCC
Operating Current
V
OUT
V
OL
(No RF Input)
V
OUT
V
OH
(No RF Input)
V
OUT
Output Current
V
M
Voltage Range
V
M
Input Current
V
M
Switch Point (No RF Input)
LEN Input Current
LEN Switch Point
RF
IN
Input Frequency Range
RF
IN
Input Power Range
RF
IN
AC Input Resistance
RF
IN
Input Shunt Capacitance
Response Time
t
r
V
OUT
Rise Time
t
f
V
OUT
Fall Time
V
OUT
Low to High
V
OUT
High to Low
LEN = 3.6V
Low to High
High to Low
(Note 5)
RF Frequency = 600MHz to 7GHz (Note 3, 4) V
CC
= 2.7V to 5.5V
F = 1000MHz, Pin = –25dBm
F = 1000MHz, Pin = –25dBm
∆V
RF
= 1V
P-P
, f
RF
= 1000MHz, V
M
= 0.15V,
V
OUT
Low to High Transition
0.5V to 3V
3V to 0.5V
I
VOUT
= 0mA, V
M
= 0.5V
I
SINK
= 20mA, V
M
= 0.5V
I
SOURCE
= 20mA, V
M
= 0V
●
●
●
●
●
●
●
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
●
●
TYP
2.1
0.8
V
CC
– 0.4
MAX
5.5
3
UNITS
V
mA
V
V
mA
2.7
±15
–0.5
65
22
1.5
±20
V
CC
-1. 8
0.5
100
90
135
42
0.5
600 to 7000
–26 to 12
220
0.65
20
2
2
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:
RF performance is tested at 1800MHz.
Note 4:
Guaranteed by design.
Note 5:
Operation at higher frequencies is possible with reduced
performance. Consult factory for more information.
2
U
V
µA
mV
mV
µA
V
V
MHz
dBm
Ω
pF
ns
ns
ns
5536f
W
U
U
W W
W
LTC5536
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
RF Input Signal Off, V
LEN
= 0V
4.0
3.5
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
V
M
= 0.25V
V
M
SWITCHING VOLTAGE (mV)
3.0
2.5
2.0
1.5
1.0
0.5
0
2.5
3.0
4.5
3.5
4.0
SUPPLY VOLTAGE (V)
5.0
5.5
5536 G01
T
A
= 85°C
T
A
= 25°C
T
A
= –40°C
V
M
Comparator Switching Voltage
vs RF Input Power 1000MHz
2800
V
M
SWITCHING VOLTAGE (mV)
T
A
= –40°C
2000
1600
1200
800
T
A
= 85°C
400
0
–28 –24 –20 –16 –12 –8 –4 0 4
RF INPUT POWER (dBm)
V
M
SWITCHING VOLTAGE (mV)
2000
1600
T
A
= –40°C
V
M
SWITCHING VOLTAGE (mV)
2400
V
CC
= 3.6V
V
LEN
= 0V
T
A
= 25°C
V
M
Comparator Switching Voltage
vs RF Input Power 4000MHz
2800
V
M
SWITCHING VOLTAGE (mV)
V
M
SWITCHING VOLTAGE (mV)
V
M
SWITCHING VOLTAGE (mV)
2400
2000
V
CC
= 3.6V
V
LEN
= 0V
1600
1200
800
400
T
A
= 85°C
8
12
T
A
= 25°C
0
–28 –24 –20 –16 –12 –8 –4 0 4
RF INPUT POWER (dBm)
U W
8
T
A
= –40°C
Supply Current vs Supply Voltage
RF Input Signal Off, V
LEN
= V
CC
4.0
3.5
3.0
T
A
= 85°C
2.5
2.0
1.5
1.0
0.5
0
2.5
3.0
4.5
3.5
4.0
SUPPLY VOLTAGE (V)
5.0
5.5
5536 G02
V
M
Comparator Switching Voltage
vs RF Input Power 600MHz
2800
2400
2000
1600
1200
800
400
0
–28 –24 –20 –16 –12 –8 –4 0 4
RF INPUT POWER (dBm)
T
A
= 25°C
V
CC
= 3.6V
V
LEN
= 0V
T
A
= –40°C
V
M
= 0.25V
T
A
= 25°C
T
A
= –40°C
T
A
= 85°C
8
12
5536 G03
V
M
Comparator Switching Voltage
vs RF Input Power 2000MHz
2800
2400
V
CC
= 3.6V
V
LEN
= 0V
2800
2400
2000
1600
1200
800
400
V
M
Comparator Switching Voltage
vs RF Input Power 3000MHz
V
CC
= 3.6V
V
LEN
= 0V
T
A
= –40°C
T
A
= 25°C
1200
800
400
T
A
= 85°C
T
A
= 25°C
T
A
= 85°C
12
0
–28 –24 –20 –16 –12 –8 –4 0 4
RF INPUT POWER (dBm)
8
12
0
–28 –24 –20 –16 –12 –8 –4 0 4
RF INPUT POWER (dBm)
8
12
5536 G04
5536 G05
5536 G06
V
M
Comparator Switching Voltage
vs RF Input Power 5000MHz
2800
2400
2000
1600
1200
800
400
T
A
= 85°C
8
12
T
A
= 25°C
V
CC
= 3.6V
V
LEN
= 0V
2800
2400
2000
1600
1200
V
M
Comparator Switching Voltage
vs RF Input Power 6000MHz
V
CC
= 3.6V
V
LEN
= 0V
T
A
= –40°C
T
A
= –40°C
T
A
= 25°C
800
400
T
A
= 85°C
0
–28 –24 –20 –16 –12 –8 –4 0 4
RF INPUT POWER (dBm)
8
12
0
–28 –24 –20 –16 –12 –8 –4 0 4
RF INPUT POWER (dBm)
5536 G07
5536 G08
5536 G09
5536f
3
LTC5536
TYPICAL PERFOR A CE CHARACTERISTICS
V
M
Comparator Switching Voltage
vs RF Input Power 7000MHz
SLOPE OF V
M
SWITCHING VOLTAGE (mV/dB)
2800
2400
2000
1600
1200
800
400
T
A
= 85°C
8
12
T
A
= – 40°C
T
A
= 25°C
V
CC
= 3.6V
V
LEN
= 0V
1000
V
CC
= 3.6V
SLOPE OF V
M
SWITCHING VOLTAGE (mV/dB)
V
M
SWITCHING VOLTAGE (mV)
0
–28 –24 –20 –16 –12 –8 –4 0 4
RF INPUT POWER (dBm)
Slope of V
M
Comparator
Switching Voltage vs
RF Input Power at 2000MHz
SLOPE OF V
M
SWITCHING VOLTAGE (mV/dB)
SLOPE OF V
M
SWITCHING VOLTAGE (mV/dB)
1000
V
CC
= 3.6V
1000
V
CC
= 3.6V
SLOPE OF V
M
SWITCHING VOLTAGE (mV/dB)
100
T
A
= 25°C
T
A
= – 40°C
10
T
A
= 85°C
1
0
4
–20 –16 –12 –8 –4
RF INPUT POWER (dBm)
Slope of V
M
Comparator
Switching Voltage vs
RF Input Power at 5000MHz
SLOPE OF V
M
SWITCHING VOLTAGE (mV/dB)
SLOPE OF V
M
SWITCHING VOLTAGE (mV/dB)
1000
V
CC
= 3.6V
1000
V
CC
= 3.6V
SLOPE OF V
M
SWITCHING VOLTAGE (mV/dB)
100
T
A
= – 40°C
T
A
= 25°C
10
T
A
= 85°C
1
0
4
–20 –16 –12 –8 –4
RF INPUT POWER (dBm)
4
U W
8
8
Slope of V
M
Comparator
Switching Voltage vs
RF Input Power at 600MHz
1000
Slope of V
M
Comparator
Switching Voltage vs
RF Input Power at 1000MHz
V
CC
= 3.6V
100
T
A
= 25°C
T
A
= – 40°C
10
T
A
= 85°C
100
T
A
= – 40°C
10
T
A
= 85°C
1
0
4
–20 –16 –12 –8 –4
RF INPUT POWER (dBm)
T
A
= 25°C
5536 G10
1
0
4
–20 –16 –12 –8 –4
RF INPUT POWER (dBm)
8
12
8
12
5536 G11
5536 G12
Slope of V
M
Comparator
Switching Voltage vs
RF Input Power at 3000MHz
1000
Slope of V
M
Comparator
Switching Voltage vs
RF Input Power at 4000MHz
V
CC
= 3.6V
100
T
A
= 25°C
100
T
A
= 25°C
T
A
= – 40°C
10
T
A
= 85°C
T
A
= – 40°C
10
T
A
= 85°C
12
5536 G13
1
0
4
–20 –16 –12 –8 –4
RF INPUT POWER (dBm)
8
12
5536 G14
1
0
4
–20 –16 –12 –8 –4
RF INPUT POWER (dBm)
8
12
5536 G15
Slope of V
M
Comparator
Switching Voltage vs
RF Input Power at 6000MHz
1000
Slope of V
M
Comparator
Switching Voltage vs
RF Input Power at 7000MHz
V
CC
= 3.6V
100
T
A
= – 40°C
T
A
= 25°C
10
T
A
= 85°C
1
0
4
–20 –16 –12 –8 –4
RF INPUT POWER (dBm)
100
T
A
= 25°C
T
A
= – 40°C
10
T
A
= 85°C
12
8
12
5536 G16
5536 G17
1
0
4
–20 –16 –12 –8 –4
RF INPUT POWER (dBm)
8
12
5536 G18
5536f
LTC5536
TYPICAL PERFOR A CE CHARACTERISTICS
RF
IN
Input Impedance (Pin = –25dBm, V
CC
= 3.6V, T
A
= 25°C)
FREQUENCY
(GHz)
0.60
0.79
0.98
1.18
1.37
1.56
1.75
1.94
2.14
2.33
2.52
2.71
2.90
3.10
3.29
3.48
3.67
3.86
4.06
4.25
4.44
4.63
4.82
5.02
5.21
5.40
5.59
5.78
5.98
6.17
6.36
6.55
6.74
6.87
7.00
RESISTANCE
(Ω)
152.91
123.50
102.42
86.70
74.80
65.80
58.82
53.15
48.80
45.86
42.88
40.43
38.21
35.73
34.09
32.16
30.77
30.30
27.45
25.57
24.59
23.92
23.62
23.45
23.24
23.30
23.66
24.20
25.03
25.27
25.06
25.08
25.29
25.59
25.99
REACTANCE
(Ω)
–116.16
–111.98
–105.03
–96.82
–88.72
–80.93
–73.67
–67.22
– 60.93
– 55.62
–51.52
–47.41
– 43.52
– 39.58
– 35.73
– 32.68
– 28.25
– 26.77
– 22.91
–19.02
–15.00
–11.08
–7.35
–3.68
– 0.09
3.53
7.08
10.37
13.36
15.93
18.97
22.50
26.13
28.64
31.20
U W
S11 Forward Reflection
Impedance
0.6GHz–7.0GHz
5536 G19
5536f
5
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