LTC5505-1/LTC5505-2
1
5505f
■
Multimode Mobile Phone Products
■
PCS Devices
■
Wireless Data Modems
■
Wireless and Cable Infrastructure
■
RF Power Alarm
■
Envelope Detector
■
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
RF Power Detector
with Buffered Output and >40dB
Dynamic Range
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.
Dual Band Mobile Phone Tx Power Control
ThinSOT is a trademark of Linear Technology Corporation
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
LTC5505-X
1
2
3
5
4
MOBILE PHONE
DSP
C2
0.1µFLi-Ion
V
CC
V
OUT
RF
IN
GND
SHDN
RF
DISABLE ENABLE
V
PC
Tx PA MODULE
CELL BAND
PCS BAND
BSE
5505 TA01
DIPLEXER
R1
100Ω
C1
0.3pF
LTC5505-1/LTC5505-2
2
5505f
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
ORDER PART
NUMBER
S5 PART
MARKING
T
JMAX
= 125°C, θ
JA
= 250°C/W LTXV
LTRW
LTC5505-1ES5
LTC5505-2ES5
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
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 TYP MAX UNITS
V
CC
Operating Voltage ●2.7 6 V
I
VCC
Shutdown Current SHDN = LO ●2µA
I
VCC
Operating Current SHDN = HI, I
VOUT
= 0mA ●0.5 0.75 mA
V
OUT
V
OL
(No RF Input) R
LOAD
= 2k, SHDN = HI, Enabled 170 260 350 mV
SHDN = LOW, Disabled 1 mV
V
OUT
Output Current V
OUT
= 1.75V, V
CC
= 2.7V, ∆V
OUT
= 10mV ●12 mA
V
OUT
Enable Time SHDN = HI, C
LOAD
= 33pF, R
LOAD
= 2k ●820 µs
V
OUT
Bandwidth C
LOAD
= 33pF, R
LOAD
= 2k (Note 4) 4 MHz
V
OUT
Load Capacitance (Note 7) ●33 pF
V
OUT
Slew Rate V
RFIN
= 2V Step, C
LOAD
= 33pF, R
LOAD
= 2k (Note 3) 10 V/µs
V
OUT
Noise V
CC
= 3V, Noise BW = 1.5MHz, 50Ω RF Input Termination 1.4 mV
P-P
SHDN Voltage, Chip Disabled V
CC
= 2.7V to 6V ●0.35 V
SHDN Voltage, Chip Enabled V
CC
= 2.7V to 6V ●1.4 V
SHDN Input Current SHDN = 3.6V ●24 40 µA
Consult LTC Marketing for parts specified with wider operating temperature ranges.
5 V
CC
4 V
OUT
RF
IN
1
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC SOT-23
GND 2
SHDN 3
LTC5505-1/LTC5505-2
3
5505f
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.
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 TYP MAX UNITS
RF
IN
Input Frequency Range (LTC5505-1) 300 to 3000 MHz
(LTC5505-2) 300 to 3500 MHz
RF
IN
Input Power Range (LTC5505-1) RF Frequency = 900MHz (Note 5, 6, 7) V
CC
= 2.7V to 6V –28 to 18 dBm
RF Frequency = 1800MHz (Note 5, 6, 7)V
CC
= 2.7V to 6V –26 to 18 dBm
RF Frequency = 2400MHz (Note 5, 7)V
CC
= 2.7V to 6V –24 to 16 dBm
RF Frequency = 2700MHz (Note 5, 7)V
CC
= 2.7V to 6V –22 to 16 dBm
RF
IN
Input Power Range (LTC5505-2) RF Frequency = 900MHz (Note 5) –32 to 12 dBm
RF Frequency = 1800MHz (Note 5) –32 to 12 dBm
RF Frequency = 2400MHz (Note 5) –32 to 12 dBm
RF Frequency = 2700MHz (Note 5) –30 to 12 dBm
RF
IN
AC Input Resistance (LTC5505-1) F = 850MHz 165 Ω
F = 1850MHz 20 Ω
RF
IN
Input Shunt Capacitance (LTC5505-1) 2pF
RF
IN
AC Input Resistance (LTC5505-2) F = 850MHz 165 Ω
F = 1850MHz 59 Ω
RF
IN
Input Shunt Capacitance (LTC5505-2) 1.3 pF
LTC5505-1/LTC5505-2
4
5505f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
LTC5505-1 Typical Detector
Characteristics, 0.85GHz
LTC5505-2 Typical Detector
Characteristics, 0.85GHz
LTC5505-1 Typical Detector
Characteristics, 2.45GHz
LTC5505-1 Typical Detector
Characteristics, 1.85GHz
RF INPUT POWER (dBm)
VOUT OUTPUT VOLTAGE (mV)
10000
5505 G01
100
1000
–24 –18 –12 –6 0 6 12
–30
VCC = 2.7V TO 6V
0Ω SERIES TERMINATION
–40°C
25°C
85°C
RF INPUT POWER (dBm)
VOUT OUTPUT VOLTAGE (mV)
10000
5505 G02
100
1000
–24 –18 –12 –6 0 6 12
–30
VCC = 2.7V TO 6V
0Ω SERIES TERMINATION
–40°C
25°C
85°C
RF INPUT POWER (dBm)
VOUT OUTPUT VOLTAGE (mV)
10000
5505 G03
100
1000
–24 –18 –12 –6 0 6 12
–30
VCC = 2.7V TO 6V
0Ω SERIES TERMINATION
–40°C
25°C
85°C
RF INPUT POWER (dBm)
VOUT OUTPUT VOLTAGE (mV)
10000
5505 G04
100
1000
–26 –20 –14 –8 –2 4 10
–32
VCC = 2.7V TO 6V
0Ω SERIES TERMINATION
–40°C
25°C
85°C
LTC5505-2 Typical Detector
Characteristics, 2.45GHz
LTC5505-2 Typical Detector
Characteristics, 1.85GHz
RF INPUT POWER (dBm)
VOUT OUTPUT VOLTAGE (mV)
10000
5505 G05
100
1000
–26 –20 –14 –8 –2 4 10
–32
VCC = 2.7V TO 6V
0Ω SERIES TERMINATION
–40°C
25°C
85°C
RF INPUT POWER (dBm)
VOUT OUTPUT VOLTAGE (mV)
10000
5505 G06
100
1000
–26 –20 –14 –8 –2 4 10
–32
VCC = 2.7V TO 6V
0Ω SERIES TERMINATION
–40°C
25°C
85°C
LTC5505-2 Typical Detector
Characteristics, 3.5GHz
RF INPUT POWER (dBm)
VOUT OUTPUT VOLTAGE (mV)
10000
5505 G07
100
1000
–26 –20 –14 –8 –2 4 10
–32
VCC = 2.7V TO 6V
0Ω SERIES TERMINATION
–40°C
25°C
85°C
LTC5505-1/LTC5505-2
5
5505f
BLOCK DIAGRA
W
UU
U
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.
–
+
–
+
5505 BD
GAIN
COMPRESSION
SHDN
28pF
V
OUT
SHDN
GND 2
3
4
5
BUFFER
250Ω
RF DET
30k
30k
60µA60µA
150k
22k
130mV
BIAS
100Ω
100Ω
RF
IN
V
CC
1
LTC5505-1/LTC5505-2
6
5505f
APPLICATIO S I FOR ATIO
WUUU
Operation
The LTC5505-X RF detector integrates several functions to
provide RF power detection over frequencies ranging from
300MHz to 3.5GHz. 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, a delay circuit to avoid voltage transients at
V
OUT
when coming out of shutdown and a gain compres-
sion circuit to extend the detector dynamic range.
Buffer Amplifier
The buffer amplifier has a gain of two and is capable of
driving a 2mA load. The buffer amplifier typically has an
output voltage range of 0.25V to 1.75V.
RF Detector
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 Schottky detector is biased at about 60µA and drives
a peak detector capacitor of 28pF.
Gain Compression
The gain compression circuit changes the feedback ratio
as the RF peak-detected input voltage increases above
100mV. Below 100mV, the voltage gain from the peak
detector to the buffer output is 1.5. Above 200mV, the
voltage gain is reduced to 0.7. The compression expands
the low power detector range due to higher gain.
Modes of Operation
MODE SHDN OPERATION
Shutdown Low Disabled
Enable High Power Detect
Applications
The LTC5505-1 and LTC5505-2 can be used as self-
standing signal strength measuring receivers for a wide
range of input signals from –32dBm to 18dBm for fre-
quencies from 300MHz to 3.5GHz.
The LTC5505-1 and LTC5505-2 can be used as demodu-
lators for AM and ASK modulated signals with data rates
up to 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 LTC5505-1 and LTC5505-2 can be used for dual band
mobile phone transmitter power control (refer to Typical
Application schematic on first page). The circuit uses a
capacitive tap at the Tx PA outputs. For example, a 0.3pF
capacitor (C1) followed by a 100Ω resistor (R1) forms a
coupling circuit with about a 20dB loss at the cellular band
and 18dB loss at the PCS band, referenced to the LTC5505-2
IC RF input pin. For improved coupling accuracy, the C1
capacitor should be a high tolerance component (±0.05pF.)
Example of LTC5505-X GSM/DCS Power Control Timing Diagram
5505 TD
t
1
t
1
: PART COMES OUT OF SHUTDOWN 20µs MAXIMUM PRIOR TO BURST.
t
2
: CIRCUITS POWER UP AND SETTLE.
t
3
: BASEBAND CONTROLLER STARTS RF POWER RAMP UP AT 22µs AFTER SHDN IS ASSERTED HIGH.
t
2
t
3
t
4
t
5
t
6
20µs2µs28µs 543µs 28µs
SHDN
V
OUT
RF INPUT
POWER
t
4
: BASEBAND CONTROLLER COMPLETES RAMP UP.
t
5
: BASEBAND CONTROLLER STARTS RF POWER RAMP DOWN AT END OF BURST.
t
6
: LTC5505-X RETURNS TO SHUTDOWN MODE BETWEEN BURSTS
LTC5505-1/LTC5505-2
7
5505f
PACKAGE DESCRIPTIO
U
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.
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
1.50 – 1.75
(NOTE 4)
2.80 BCS
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
DATUM ‘A’
0.09 – 0.20
(NOTE 3)
S5 TSOT-23 0801
PIN ONE
2.90 BSC
(NOTE 4)
0.95 BSC
1.90 BSC
0.80 – 0.90
1.00 MAX 0.01 – 0.10
0.20 BSC
0.35 – 0.50 REF
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. JEDEC PACKAGE REFERENCE IS MO-193
3.254
0.754
0.95 BSC
0.854 ±0.127
RECOMMENDED SOLDER PAD LAYOUT
1.9 BSC
Dual Band Mobile Phone Tx Power Control with Directional Coupler
LTC5505-X
1
2
3
5
4
MOBILE PHONE
DSP
0.1µF Li-Ion
VCC
VOUT
RFIN
GND
SHDN
DISABLE ENABLE
33pF
900MHz
INPUT
1.8GHz
INPUT 900MHz
OUTPUT
1.8GHz
OUTPUT
VPC
Tx PA MODULE
BSEL
50Ω
5505 TA02
DIRECTIONAL
COUPLER DIPLEXER
0Ω TO 20Ω
TYPICAL APPLICATIO
U
LTC5505-1/LTC5505-2
8
5505f
LT/TP 1102 2K • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2001
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