LTC5505-1/LTC5505-2
RF Power Detector
with Buffered Output and >40dB
Dynamic Range
FEATURES
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DESCRIPTIO
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Internal Schottky Diode RF Detector with Two Input
Power Ranges:
LTC5505-1, –28dBm to 18dBm
LTC5505-2, –32dBm to 12dBm
Wide Input Frequency Range: 300MHz to 3GHz
(LTC5505-1); 300MHz to 3.5GHz (LTC5505-2)
Temperature Compensated
Buffered Detector Output
Wide V
CC
Range of 2.7V to 6V
Low Operating Current: 0.5mA
Low Shutdown Current: <2µA
Low Profile (1mm) ThinSOT
TM
Package
The LTC
®
5505-X is an RF power detector for RF applica-
tions operating in the 300MHz to 3.5GHz range. A tem-
perature compensated Schottky diode peak detector and
buffer amplifier are combined in a small 5-pin ThinSOT
package. The supply voltage range is optimized for opera-
tion 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 supply current to less than 2µA.
The LTC5505-1 operates with input power levels from
–28dBm to 18dBm. The LTC5505-2 operates with input
power levels from –32dBm to 12dBm.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation
APPLICATIO S
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Multimode Mobile Phone Products
PCS Devices
Wireless Data Modems
Wireless and Cable Infrastructure
RF Power Alarm
Envelope Detector
TYPICAL APPLICATIO
Dual Band Mobile Phone Tx Power Control
R1
100Ω
RF
1
2
DISABLE ENABLE
3
LTC5505-X
V
CC
5
RF
IN
GND
SHDN
V
OUT
4
C1
0.3pF
Tx PA MODULE
C2
0.1µF
Li-Ion
CELL BAND
DIPLEXER
PCS BAND
MOBILE PHONE
DSP
V
PC
5505 TA01
BSE
U
5505f
U
U
1
LTC5505-1/LTC5505-2
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
TOP VIEW
RF
IN
1
GND 2
SHDN 3
4 V
OUT
5 V
CC
V
CC
, V
OUT
to GND .................................... –0.3V to 6.5V
RF Voltage
LTC5505-1 ................................... (V
CC
– 2.6V) to 7V
LTC5505-2 ................................... (V
CC
– 1.4V) to 7V
SHDN Voltage to GND ................ –0.3V to (V
CC
+ 0.3V)
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
LTC5505-1ES5
LTC5505-2ES5
S5 PART
MARKING
LTXV
LTRW
S5 PACKAGE
5-LEAD PLASTIC SOT-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,
unless otherwise noted.
PARAMETER
V
CC
Operating Voltage
I
VCC
Shutdown Current
I
VCC
Operating Current
V
OUT
V
OL
(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
SHDN Voltage, Chip Disabled
SHDN Voltage, Chip Enabled
SHDN Input Current
SHDN = LO
SHDN = HI, I
VOUT
= 0mA
R
LOAD
= 2k, SHDN = HI, Enabled
SHDN = LOW, Disabled
V
OUT
= 1.75V, V
CC
= 2.7V,
∆V
OUT
= 10mV
SHDN = HI, C
LOAD
= 33pF, R
LOAD
= 2k
C
LOAD
= 33pF, R
LOAD
= 2k (Note 4)
(Note 7)
V
RFIN
= 2V Step, C
LOAD
= 33pF, R
LOAD
= 2k (Note 3)
V
CC
= 3V, Noise BW = 1.5MHz, 50Ω RF Input Termination
V
CC
= 2.7V to 6V
V
CC
= 2.7V to 6V
SHDN = 3.6V
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
q
q
q
TYP
MAX
6
2
UNITS
V
µA
mA
mV
mV
mA
µs
MHz
pF
V/µs
mV
P-P
2.7
0.5
170
1
260
1
2
8
4
0.75
350
20
33
10
1.4
0.35
1.4
24
40
2
U
V
V
µA
5505f
W
U
U
W W
W
LTC5505-1/LTC5505-2
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,
unless otherwise noted.
PARAMETER
RF
IN
Input Frequency Range (LTC5505-1)
(LTC5505-2)
RF
IN
Input Power Range (LTC5505-1)
RF Frequency = 900MHz (Note 5, 6, 7) V
CC
= 2.7V to 6V
RF Frequency = 1800MHz (Note 5, 6, 7)V
CC
= 2.7V to 6V
RF Frequency = 2400MHz (Note 5, 7)V
CC
= 2.7V to 6V
RF Frequency = 2700MHz (Note 5, 7)V
CC
= 2.7V to 6V
RF Frequency = 900MHz (Note 5)
RF Frequency = 1800MHz (Note 5)
RF Frequency = 2400MHz (Note 5)
RF Frequency = 2700MHz (Note 5)
F = 850MHz
F = 1850MHz
F = 850MHz
F = 1850MHz
CONDITIONS
MIN
TYP
300 to 3000
300 to 3500
–28 to 18
–26 to 18
–24 to 16
–22 to 16
–32 to 12
–32 to 12
–32 to 12
–30 to 12
165
20
2
165
59
1.3
MAX
UNITS
MHz
MHz
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
Ω
Ω
pF
Ω
Ω
pF
ELECTRICAL CHARACTERISTICS
RF
IN
Input Power Range (LTC5505-2)
RF
IN
AC Input Resistance (LTC5505-1)
RF
IN
Input Shunt Capacitance (LTC5505-1)
RF
IN
AC Input Resistance (LTC5505-2)
RF
IN
Input Shunt Capacitance (LTC5505-2)
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:
The rise time at V
OUT
is measured between 0.5V and 1.5V.
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, 14dBm, –14dBm (LTC5505-1)
1800MHz, 12dBm, –14dBm (LTC5505-2)
Note 6:
For input RF power levels >16dBm, V
CC
minimum is 3V and an RF
input series resistor of 20Ω is required to limit the input current.
Note 7:
Guaranteed by design.
5505f
3
LTC5505-1/LTC5505-2
TYPICAL PERFOR A CE CHARACTERISTICS
LTC5505-1 Typical Detector
Characteristics, 0.85GHz
10000
10000
V
CC
= 2.7V TO 6V
0Ω SERIES TERMINATION
–40°C
25°C
85°C
V
OUT
OUTPUT VOLTAGE (mV)
V
OUT
OUTPUT VOLTAGE (mV)
1000
1000
100
0
6
–30 –24 –18 –12 –6
RF INPUT POWER (dBm)
12
5505 G01
100
–30 –24
V
OUT
OUTPUT VOLTAGE (mV)
LTC5505-2 Typical Detector
Characteristics, 0.85GHz
10000
V
CC
= 2.7V TO 6V
0Ω SERIES TERMINATION
–40°C
25°C
85°C
10000
V
OUT
OUTPUT VOLTAGE (mV)
1000
100
–32
V
OUT
OUTPUT VOLTAGE (mV)
–26
–20 –14 –8
–2
4
RF INPUT POWER (dBm)
LTC5505-2 Typical Detector
Characteristics, 2.45GHz
10000
V
CC
= 2.7V TO 6V
0Ω SERIES TERMINATION
–40°C
25°C
85°C
10000
V
OUT
OUTPUT VOLTAGE (mV)
1000
V
OUT
OUTPUT VOLTAGE (mV)
100
–32
–26
–20 –14 –8
–2
4
RF INPUT POWER (dBm)
4
U W
LTC5505-1 Typical Detector
Characteristics, 1.85GHz
V
CC
= 2.7V TO 6V
0Ω SERIES TERMINATION
–40°C
25°C
85°C
10000
LTC5505-1 Typical Detector
Characteristics, 2.45GHz
V
CC
= 2.7V TO 6V
0Ω SERIES TERMINATION
–40°C
25°C
85°C
1000
–18 –12 –6
0
6
RF INPUT POWER (dBm)
12
5505 G02
100
0
6
–30 –24 –18 –12 –6
RF INPUT POWER (dBm)
12
5505 G03
LTC5505-2 Typical Detector
Characteristics, 1.85GHz
V
CC
= 2.7V TO 6V
0Ω SERIES TERMINATION
–40°C
25°C
85°C
1000
10
5505 G04
100
–32
–26
–20 –14 –8
–2
4
RF INPUT POWER (dBm)
10
5505 G05
LTC5505-2 Typical Detector
Characteristics, 3.5GHz
V
CC
= 2.7V TO 6V
0Ω SERIES TERMINATION
–40°C
25°C
85°C
1000
10
5505 G06
100
–32
–26
–20 –14 –8
–2
4
RF INPUT POWER (dBm)
10
5505 G07
5505f
LTC5505-1/LTC5505-2
PI FU CTIO S
RF
IN
(Pin 1):
RF Input Voltage. Referenced to V
CC
. An
external coupling capacitor to the RF source is required.
The frequency range is 300MHz to 3GHz. This pin has an
internal 250Ω termination, an internal Schottky diode
detector and peak detector capacitor. (See Note 6 in the
Electrical Characteristics.)
GND (Pin 2):
System Ground.
SHDN (Pin 3):
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 the drivers are in
a tri-state condition.
V
OUT
(Pin 4):
Buffered and Level Shifted Detector Output
Voltage.
V
CC
(Pin 5):
Power Supply Voltage, 2.7V to 6V. V
CC
should
be bypassed appropriately with ceramic capacitors.
BLOCK DIAGRA
RF
IN
1
30k
100Ω
60µA
GND 2
W
U
U
U
V
CC
5
GAIN
COMPRESSION
+
BUFFER
4
V
OUT
–
SHDN
250Ω
30k
100Ω
28pF
+
RF DET
130mV
–
60µA
150k
22k
BIAS
3
SHDN
5505 BD
5505f
5
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