LTC5531
Precision 300MHz to 7GHz
RF Detector with Shutdown
and Offset Adjustment
FEATURES
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Temperature Compensated Internal Schottky
Diode RF Detector
Wide Input Frequency Range: 300MHz to 7GHz*
Wide Input Power Range: –32dBm to 10dBm
Buffered Detector Output
Precision V
OUT
Offset Control
Wide V
CC
Range of 2.7V to 6V
Low Operating Current: 500µA
Low Shutdown Current: <2µA
Available in a Low Profile (1mm) SOT-23 Package
The LTC
®
5531 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. A power saving shutdown mode
reduces current to less than 2µA. The initial offset voltage
of 120mV
±35mV
can be precisely adjusted using the
V
OS
pin.
The LTC5531 operates with input power levels from
–32dBm to 10dBm.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
*
Higher frequency operation is achievable with reduced performance. Consult factory for more
information.
APPLICATIO S
s
s
s
s
s
s
s
802.11a, 802.11b, 802.11g, 802.15, 802.16
Multimode Mobile Phone Products
Optical Data Links
Wireless Data Modems
Wireless and Cable Infrastructure
RF Power Alarm
Envelope Detector
TYPICAL APPLICATIO
V
OUT
Output Voltage vs RF Input Power
300MHz to 7GHz RF Power Detector
33pF
RF
INPUT
1
V
OUT
OUTPUT VOLTAGE (mV)
LTC5531
V
CC
6
RF
IN
100pF
2
GND
V
OUT
5
3600
V
OS
= 0V
V
CC
= 3.6V
3200
T
A
= 25°C
2800
2400
2000
1600
1200
800
400
V
CC
0.1µF
DISABLE ENABLE
3
SHDN
V
OS
5531 TA01
4 V
OS
REFERENCE
0
–30 –26 –22 –18 –14 –10 –6 –2 2
RF INPUT POWER (dBm)
U
2000MHz
1000MHz
4000MHz
3000MHz
300MHz
5000MHz
6000MHz
7000MHz
6
10
5531 TA02
U
U
5531f
1
LTC5531
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
RF
IN
1
GND 2
SHDN 3
6 V
CC
5 V
OUT
4 V
OS
V
CC
, V
OUT
, SHDN, V
OS ....................................
–0.3V to 6.5V
RF
IN
Voltage ......................................(V
CC
±
1.5V) to 7V
RF
IN
Power (RMS) .............................................. 12dBm
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
ORDER PART
NUMBER
LTC5531ES6
S6 PART
MARKING
LTBBQ
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
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.6V, SHDN = V
CC
= HI, SHDN = 0V = LO, RF Input Signal is Off,
V
OS
= 0V and SHDN = HI unless otherwise noted.
PARAMETER
V
CC
Operating Voltage
I
VCC
Operating Current
I
VCC
Shutdown Current
V
OUT
(No RF Input)
V
OUT
Output Current
V
OUT
Enable Time
V
OUT
Bandwidth
V
OUT
Load Capacitance
V
OUT
Slew Rate
V
OUT
Noise
V
OS
Voltage Range
V
OS
Input Current
SHDN Voltage, Chip Disabled
SHDN Voltage, Chip Enabled
SHDN Input Current
RF
IN
Input Frequency Range
RF
IN
Input Power Range
RF
IN
AC Input Resistance
RF
IN
Input Shunt Capacitance
V
CC
= 2.7V to 6V
V
CC
= 2.7V to 6V
SHDN = 3.6V
(Note 8)
RF Frequency = 300MHz to 7GHz (Note 5, 6) V
CC
= 2.7V to 6V
F = 1000MHz, Pin = –25dBm
F = 1000MHz, Pin = –25dBm
I
VOUT
= 0mA
SHDN = LO
R
LOAD
= 2k, V
OS
= 0V
SHDN = LO
V
OUT
= 1.75V, V
CC
= 2.7V,
∆V
OUT
< 10mV
SHDN = LO to HI, C
LOAD
= 33pF, R
LOAD
= 2k
C
LOAD
= 33pF, R
LOAD
= 2k (Note 4)
(Notes 6, 7)
V
RFIN
= 1V Step, C
LOAD
= 33pF, R
LOAD
= 2k (Note 3)
V
CC
= 3V, Noise BW = 1.5MHz, 50Ω RF Input Termination
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
q
q
q
q
q
q
TYP
0.5
0.01
MAX
6
0.7
2
155
UNITS
V
mA
µA
mV
mV
mA
µs
MHz
pF
V/µs
mV
P-P
2.7
85
2
100 to 140
1
4
8
2
20
33
3
1
0
–0.5
1.4
22
300 to 7000
–32 to 10
220
0.65
36
1
0.5
0.35
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.
Note 7:
Capacitive loading greater than this value may result in circuit
instability.
Note 8:
Higher frequency operation is achievable with reduced
performance. Consult factory for more information.
5531f
2
U
V
µA
V
V
µA
MHz
dBm
Ω
pF
W
U
U
W W
W
LTC5531
TYPICAL PERFOR A CE CHARACTERISTICS
V
OUT
Output Voltage vs
V
CC
Supply Voltage
(RF Input Signal Off)
135
V
OS
= 0V
520
V
OUT
OUTPUT VOLTAGE (mV)
V
OUT
OUTPUT VOLTAGE (mV)
SUPPLY CURRENT (µA)
130
T
A
= 85°C
125
T
A
= 25°C
120
T
A
= –40°C
115
2.5
3.0
3.5
4.0 4.5
5.0
SUPPLY VOLTAGE (V)
V
OUT
vs RF Input Power and V
OS
,
f
RF
= 1000MHz
3600
V
CC
= 3.6V
3200 T
A
= 25°C
V
OUT
OUTPUT VOLTAGE (mV)
2800
2400
2000
1600
1200
800
400
V
OS
= 1V
V
OS
= 0.5V
V
OS
= 0.2V
5600
4800
V
OUT
OUTPUT VOLTAGE (mV)
V
OS
= 0V
0
–32 –28 –24 –20 –16 –12 –8 –4 0
RF INPUT POWER (dBm)
Typical Detector Characteristics,
300MHz
3600
3200
V
OS
= 0V
V
CC
= 3.6V
V
OUT
OUTPUT VOLTAGE (mV)
V
OUT
OUTPUT VOLTAGE (mV)
2800
2400
2000
1600
1200
800
400
0
–32 –28 –24 –20 –16 –12 –8 –4
RF INPUT POWER (dBm)
5531
G06
U W
5.5
I
CC
Power Supply Current vs
V
CC
Supply Voltage
(RF Input Signal Off)
V
OS
= 0V
3600
T
A
= –40°C
T
A
= 25°C
480
T
A
= 85°C
V
OUT
vs RF Input Power and V
OS
,
f
RF
= 300MHz
V
CC
= 3.6V
3200 T
A
= 25°C
2800
2400
2000
1600
1200
800
400
V
OS
= 1V
V
OS
= 0.5V
V
OS
= 0.2V
500
460
440
6.0
420
2.5
3.0
3.5
4.0 4.5
5.0
SUPPLY VOLTAGE (V)
5.5
6.0
V
OS
= 0V
0
–32 –28 –24 –20 –16 –12 –8 –4 0
RF INPUT POWER (dBm)
4
8
5531 G01
5531 G02
5531
G03
V
OUT
vs RF Input Power and V
CC
Supply Voltage, f
RF
= 1000MHz
V
OS
= 0V
T
A
= 25°C
4000
3200
2400
1600
800
0
V
CC
= 6V
V
CC
= 5V
V
CC
= 4V
V
CC
= 3V
–32 –28 –24 –20 –16 –12 –8 –4 0 4
RF INPUT POWER (dBm)
8 12
5531
G05
4
8
5531
G04
Typical Detector Characteristics,
1000MHz
3600
V
OS
= 0V
V
CC
= 3.6V
3200
2800
2400
2000
1600
1200
800
400
T
A
= 85°C
T
A
= 25°C
T
A
= –40°C
T
A
= –40°C
T
A
= 25°C
T
A
= 85°C
0
4
8
0
–32 –28 –24 –20 –16 –12 –8 –4 0
RF INPUT POWER (dBm)
4
8
5531
G07
5531f
3
LTC5531
TYPICAL PERFOR A CE CHARACTERISTICS
Typical Detector Characteristics,
2000MHz
3600
V
OS
= 0V
3200 V
CC
= 3.6V
V
OUT
OUTPUT VOLTAGE (mV)
V
OUT
OUTPUT VOLTAGE (mV)
2800
2400
2000
1600
1200
800
400
T
A
= 85°C
T
A
= 25°C
T
A
= –40°C
2800
2400
2000
1600
1200
800
400
T
A
= 85°C
T
A
= 25°C
T
A
= –40°C
V
OUT
OUTPUT VOLTAGE (mV)
0
–32 –28 –24 –20 –16 –12 –8 –4 0
RF INPUT POWER (dBm)
Typical Detector Characteristics,
5000MHz
3600
V
OS
= 0V
3200 V
CC
= 3.6V
3600
V
OUT
OUTPUT VOLTAGE (mV)
2800
2400
2000
1600
1200
800
400
V
OUT
OUTPUT VOLTAGE (mV)
0
–30 –26 –22 –18 –14 –10 –6 –2 2
RF INPUT POWER (dBm)
Typical Detector Characteristics,
7000MHz
3600
V
OS
= 0V
3200 V
CC
= 3.6V
1000
V
OUT
OUTPUT VOLTAGE (mV)
2800
2400
2000
1600
1200
800
400
V
OUT
SLOPE (mV/dB)
0
–30 –26 –22 –18 –14 –10 –6 –2 2
RF INPUT POWER (dBm)
4
U W
4
5531
G07
Typical Detector Characteristics,
3000MHz
3600
V
OS
= 0V
3200 V
CC
= 3.6V
3600
Typical Detector Characteristics,
4000MHz
V
OS
= 0V
3200 V
CC
= 3.6V
2800
2400
2000
1600
1200
800
400
T
A
= 85°C
T
A
= 25°C
T
A
= –40°C
8
0
–30 –26 –22 –18 –14 –10 –6 –2 2
RF INPUT POWER (dBm)
6
10
0
–30 –26 –22 –18 –14 –10 –6 –2 2
RF INPUT POWER (dBm)
6
10
5531
G09
5531
G10
Typical Detector Characteristics,
6000MHz
V
OS
= 0V
V
CC
= 3.6V
3200
T
A
= –40°C
2800
2400
2000
1600
1200
800
400
T
A
= –40°C
T
A
= 25°C
T
A
= 25°C
T
A
= 85°C
T
A
= 85°C
6
10
0
–30 –26 –22 –18 –14 –10 –6 –2 2
RF INPUT POWER (dBm)
6
10
5531
G11
5531
G12
V
OUT
Slope vs RF Input Power
at 300MHz
T
A
= –40°C
100
T
A
= 25°C
T
A
= –40°C
10
T
A
= 85°C
T
A
= 85°C
1
–30
T
A
= 25°C
10
–25
–20 –15 –10 –5
RF INPUT POWER (dBm)
0
5
5531 G14
6
5531
G13
5531f
LTC5531
TYPICAL PERFOR A CE CHARACTERISTICS
V
OUT
Slope vs RF Input Power
at 1000MHz
1000
V
OS
= 0V
V
CC
= 3.6V
1000
V
OUT
SLOPE (mV/dB)
V
OUT
SLOPE (mV/dB)
100
100
V
OUT
SLOPE (mV/dB)
T
A
= –40°C
10
T
A
= 85°C
T
A
= 25°C
1
–30
–25
–20 –15 –10 –5
RF INPUT POWER (dBm)
0
5
5531 G15
V
OUT
Slope vs RF Input Power
at 4000MHz
1000
V
OS
= 0V
V
CC
= 3.6V
1000
V
OUT
SLOPE (mV/dB)
100
V
OUT
SLOPE (mV/dB)
T
A
= –40°C
10
T
A
= 85°C
1
–30
–25
V
OUT
Slope vs RF Input Power
at 6000MHz
1000
V
OS
= 0V
V
CC
= 3.6V
1000
V
OUT
SLOPE (mV/dB)
100
V
OUT
SLOPE (mV/dB)
10
T
A
= –40°C
T
A
= 85°C
1
–30
–25
U W
V
OUT
Slope vs RF Input Power
at 2000MHz
V
OS
= 0V
V
CC
= 3.6V
1000
V
OUT
Slope vs RF Input Power
at 3000MHz
V
OS
= 0V
V
CC
= 3.6V
100
T
A
= –40°C
10
T
A
= 85°C
T
A
= –40°C
10
T
A
= 85°C
T
A
= 25°C
1
–30
–25
–20 –15 –10 –5
RF INPUT POWER (dBm)
0
5
5531 G16
T
A
= 25°C
1
–30
–25
–20 –15 –10 –5
RF INPUT POWER (dBm)
0
5
5531 G17
V
OUT
Slope vs RF Input Power
at 5000MHz
V
OS
= 0V
V
CC
= 3.6V
100
T
A
= –40°C
10
T
A
= 85°C
T
A
= 25°C
–20 –15 –10 –5
RF INPUT POWER (dBm)
0
5
5531 G18
T
A
= 25°C
1
–30
–25
–20 –15 –10 –5
RF INPUT POWER (dBm)
0
5
5531 G19
V
OUT
Slope vs RF Input Power
at 7000MHz
V
OS
= 0V
V
CC
= 3.6V
100
10
T
A
= –40°C
T
A
= 85°C
T
A
= 25°C
–20 –15 –10 –5
RF INPUT POWER (dBm)
0
5
5531 G20
T
A
= 25°C
1
–30
–25
–20 –15 –10 –5
RF INPUT POWER (dBm)
0
5
5531 G21
5531f
5
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