LTC5505-2ES5#PBF [Linear]
LTC5505 - RF Power Detector with Buffered Output and >40dB Dynamic Range; Package: SOT; Pins: 5; Temperature Range: -40°C to 85°C;
| 型号： | LTC5505-2ES5#PBF |
| 厂家： | 
Linear |
| 描述： | LTC5505 - RF Power Detector with Buffered Output and >40dB Dynamic Range; Package: SOT; Pins: 5; Temperature Range: -40°C to 85°C |
| 文件： | 总8页 (文件大小：144K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC5505-1/LTC5505-2
RF Power Detector
with Buffered Output and >40dB
Dynamic Range
U
DESCRIPTIO
FEATURES
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.
■
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
■
■
■
■
■
■
■
The RF input voltage is peak detected using an on-chip
Schottky diode. The detected voltage is buffered and
supplied to the VOUT pin. A power saving shutdown mode
reduces supply current to less than 2µA.
Buffered Detector Output
Wide VCC Range of 2.7V to 6V
Low Operating Current: 0.5mA
Low Shutdown Current: <2µA
Low Profile (1mm) ThinSOTTM Package
The LTC5505-1 operates with input power levels from
–28dBm to 18dBm. The LTC5505-2 operates with input
power levels from –32dBm to 12dBm.
U
APPLICATIO S
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation
■
Multimode Mobile Phone Products
■
PCS Devices
■
Wireless Data Modems
Wireless and Cable Infrastructure
RF Power Alarm
Envelope Detector
■
■
■
U
TYPICAL APPLICATIO
Dual Band Mobile Phone Tx Power Control
C1
0.3pF
R1
100Ω
RF
LTC5505-X
Tx PA MODULE
CELL BAND
1
2
3
5
4
V
CC
RF
IN
DIPLEXER
C2
0.1µF
Li-Ion
GND
V
OUT
DISABLE ENABLE
SHDN
PCS BAND
MOBILE PHONE
DSP
V
PC
5505 TA01
BSE
5505f
1
LTC5505-1/LTC5505-2
W W U W
U
W
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ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
ORDER PART
NUMBER
VCC, VOUT to GND .................................... –0.3V to 6.5V
RF Voltage
TOP VIEW
LTC5505-1 ................................... (VCC – 2.6V) to 7V
LTC5505-2 ................................... (VCC – 1.4V) to 7V
SHDN Voltage to GND ................ –0.3V to (VCC + 0.3V)
IVOUT ...................................................................... 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
RF
1
5 V
4 V
IN
CC
LTC5505-2ES5
GND 2
SHDN 3
OUT
S5 PART
MARKING
S5 PACKAGE
5-LEAD PLASTIC SOT-23
TJMAX = 125°C, θJA = 250°C/W
LTXV
LTRW
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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
6
UNITS
V
V
Operating Voltage
Shutdown Current
Operating Current
●
●
●
2.7
CC
VCC
VCC
I
I
SHDN = LO
2
µA
SHDN = HI, I
= 0mA
0.5
0.75
350
mA
VOUT
V
V
(No RF Input)
R
= 2k, SHDN = HI, Enabled
LOAD
170
1
260
1
mV
mV
OUT OL
SHDN = LOW, Disabled
V
V
V
V
V
V
Output Current
Enable Time
Bandwidth
V
= 1.75V, V = 2.7V, ∆V
= 10mV
= 2k
●
●
2
8
4
mA
µs
OUT
OUT
OUT
OUT
OUT
OUT
OUT
CC
OUT
SHDN = HI, C
= 33pF, R
20
33
LOAD
LOAD
C
= 33pF, R
= 2k (Note 4)
MHz
pF
LOAD
LOAD
Load Capacitance
Slew Rate
(Note 7)
●
V
V
V
V
= 2V Step, C
= 33pF, R = 2k (Note 3)
LOAD
10
V/µs
RFIN
LOAD
Noise
= 3V, Noise BW = 1.5MHz, 50Ω RF Input Termination
1.4
mV
P-P
CC
CC
CC
SHDN Voltage, Chip Disabled
SHDN Voltage, Chip Enabled
SHDN Input Current
= 2.7V to 6V
= 2.7V to 6V
●
●
●
0.35
40
V
1.4
V
SHDN = 3.6V
24
µA
5505f
2
LTC5505-1/LTC5505-2
ELECTRICAL CHARACTERISTICS
unless otherwise noted.
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,
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RF Input Frequency Range (LTC5505-1)
300 to 3000
300 to 3500
MHz
MHz
IN
(LTC5505-2)
RF Input Power Range (LTC5505-1)
IN
RF Frequency = 900MHz (Note 5, 6, 7) V = 2.7V to 6V
–28 to 18
–26 to 18
–24 to 16
–22 to 16
dBm
dBm
dBm
dBm
CC
RF Frequency = 1800MHz (Note 5, 6, 7)V = 2.7V to 6V
CC
RF Frequency = 2400MHz (Note 5, 7)V = 2.7V to 6V
CC
RF Frequency = 2700MHz (Note 5, 7)V = 2.7V to 6V
CC
RF Input Power Range (LTC5505-2)
IN
RF Frequency = 900MHz (Note 5)
RF Frequency = 1800MHz (Note 5)
RF Frequency = 2400MHz (Note 5)
RF Frequency = 2700MHz (Note 5)
–32 to 12
–32 to 12
–32 to 12
–30 to 12
dBm
dBm
dBm
dBm
RF AC Input Resistance (LTC5505-1)
IN
F = 850MHz
F = 1850MHz
165
20
Ω
Ω
RF Input Shunt Capacitance (LTC5505-1)
IN
2
pF
RF AC Input Resistance (LTC5505-2)
IN
F = 850MHz
F = 1850MHz
165
59
Ω
Ω
RF Input Shunt Capacitance (LTC5505-2)
IN
1.3
pF
Note 1: Absolute Maximum Ratings are those values beyond which the life
Note 5: RF performance is tested at:
of a device may be impaired.
1800MHz, 14dBm, –14dBm (LTC5505-1)
1800MHz, 12dBm, –14dBm (LTC5505-2)
Note 6: For input RF power levels >16dBm, V minimum is 3V and an RF
Note 2: Specifications over the –40°C to 85°C operating temperature
range are assured by design, characterization and correlation with
statistical process controls.
CC
input series resistor of 20Ω is required to limit the input current.
Note 3: The rise time at V
is measured between 0.5V and 1.5V.
OUT
Note 7: Guaranteed by design.
Note 4: Bandwidth is calculated using the 10% to 90% rise time equation:
BW = 0.35/rise time.
5505f
3
LTC5505-1/LTC5505-2
U W
TYPICAL PERFOR A CE CHARACTERISTICS
LTC5505-1 Typical Detector
Characteristics, 0.85GHz
LTC5505-1 Typical Detector
Characteristics, 1.85GHz
LTC5505-1 Typical Detector
Characteristics, 2.45GHz
10000
1000
100
10000
1000
100
10000
1000
100
V
= 2.7V TO 6V
V
= 2.7V TO 6V
CC
V
= 2.7V TO 6V
CC
CC
0Ω SERIES TERMINATION
0Ω SERIES TERMINATION
0Ω SERIES TERMINATION
–40°C
25°C
85°C
–40°C
25°C
85°C
–40°C
25°C
85°C
–24 –18 –12 –6
0
6
12
–24 –18 –12 –6
–30
0
6
12
–30
–24 –18 –12 –6
0
6
12
–30
RF INPUT POWER (dBm)
RF INPUT POWER (dBm)
RF INPUT POWER (dBm)
5505 G02
5505 G03
5505 G01
LTC5505-2 Typical Detector
Characteristics, 0.85GHz
LTC5505-2 Typical Detector
Characteristics, 1.85GHz
10000
1000
100
10000
V
= 2.7V TO 6V
V
= 2.7V TO 6V
CC
CC
0Ω SERIES TERMINATION
0Ω SERIES TERMINATION
–40°C
25°C
85°C
–40°C
25°C
85°C
1000
100
–32
–26 –20 –14 –8
–2
4
10
–32
–26 –20 –14 –8
–2
4
10
RF INPUT POWER (dBm)
RF INPUT POWER (dBm)
5505 G04
5505 G05
LTC5505-2 Typical Detector
Characteristics, 2.45GHz
LTC5505-2 Typical Detector
Characteristics, 3.5GHz
10000
1000
100
10000
1000
100
V
= 2.7V TO 6V
V
= 2.7V TO 6V
CC
CC
0Ω SERIES TERMINATION
0Ω SERIES TERMINATION
–40°C
25°C
85°C
–40°C
25°C
85°C
–26 –20 –14 –8
–2
4
10
–26 –20 –14 –8
–2
4
10
–32
–32
RF INPUT POWER (dBm)
RF INPUT POWER (dBm)
5505 G06
5505 G07
5505f
4
LTC5505-1/LTC5505-2
U
U
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PI FU CTIO S
RFIN (Pin 1): RF Input Voltage. Referenced to VCC. 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.)
SHDN (Pin 3): Shutdown Input. A logic low on the SHDN
pinplacesthepartinshutdownmode.Alogichighenables
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
GND (Pin 2): System Ground.
Voltage.
VCC (Pin5):PowerSupplyVoltage, 2.7Vto6V. VCC should
be bypassed appropriately with ceramic capacitors.
W
BLOCK DIAGRA
V
CC
5
GAIN
COMPRESSION
+
BUFFER
30k
V
OUT
4
–
SHDN
250Ω
RF
1
IN
100Ω
100Ω
30k
28pF
+
130mV
22k
RF DET
–
BIAS
60µA
60µA
150k
GND
2
5505 BD
3
SHDN
5505f
5
LTC5505-1/LTC5505-2
U
W
U U
APPLICATIO S I FOR ATIO
Operation
voltage gain is reduced to 0.7. The compression expands
the low power detector range due to higher gain.
TheLTC5505-XRFdetectorintegratesseveralfunctionsto
provideRFpowerdetectionoverfrequenciesrangingfrom
300MHz to 3.5GHz. These functions include an internally
compensated buffer amplifier, an RF Schottky diode peak
detectorandlevelshiftamplifiertoconverttheRFfeedback
signal to DC, a delay circuit to avoid voltage transients at
Modes of Operation
MODE
SHDN
Low
OPERATION
Disabled
Shutdown
Enable
High
Power Detect
V
OUT when coming out of shutdown and a gain compres-
sion circuit to extend the detector dynamic range.
Applications
Buffer Amplifier
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 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.
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.
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.
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
and18dBlossatthePCSband,referencedtotheLTC5505-2
IC RF input pin. For improved coupling accuracy, the C1
capacitorshouldbeahightolerancecomponent(±0.05pF.)
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
Example of LTC5505-X GSM/DCS Power Control Timing Diagram
20µs
2µs
28µs
543µs
28µs
SHDN
V
OUT
RF INPUT
POWER
5505 TD
t
t
t
t
t
t
6
1
2
3
4
5
t : PART COMES OUT OF SHUTDOWN 20µs MAXIMUM PRIOR TO BURST.
t : BASEBAND CONTROLLER COMPLETES RAMP UP.
4
1
t : CIRCUITS POWER UP AND SETTLE.
t : BASEBAND CONTROLLER STARTS RF POWER RAMP DOWN AT END OF BURST.
5
2
t : BASEBAND CONTROLLER STARTS RF POWER RAMP UP AT 22µs AFTER SHDN IS ASSERTED HIGH.
t : LTC5505-X RETURNS TO SHUTDOWN MODE BETWEEN BURSTS
6
3
5505f
6
LTC5505-1/LTC5505-2
U
TYPICAL APPLICATIO
Dual Band Mobile Phone Tx Power Control with Directional Coupler
0Ω TO 20Ω
33pF
LTC5505-X
1
2
3
5
4
V
RF
CC
IN
0.1µF
Li-Ion
BSEL
GND
V
DIRECTIONAL
COUPLER
OUT
DISABLE ENABLE
SHDN
900MHz
INPUT
Tx PA MODULE
DIPLEXER
1.8GHz
INPUT
900MHz
OUTPUT
MOBILE PHONE
DSP
1.8GHz
OUTPUT
V
PC
50Ω
5505 TA02
U
PACKAGE DESCRIPTIO
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
2.90 BSC
(NOTE 4)
0.754
0.854 ±0.127
3.254
1.50 – 1.75
2.80 BCS
(NOTE 4)
0.95 BSC
PIN ONE
0.95 BSC
1.9 BSC
RECOMMENDED SOLDER PAD LAYOUT
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.80 – 0.90
1.00 MAX
0.20 BSC
DATUM ‘A’
0.01 – 0.10
0.35 – 0.50 REF
1.90 BSC
0.09 – 0.20
(NOTE 3)
NOTE:
S5 TSOT-23 0801
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
5505f
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-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
7
LTC5505-1/LTC5505-2
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PowerPath is a trademark of Linear Technology Corporation.
5505f
LT/TP 1102 2K • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
●
●
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
LINEAR TECHNOLOGY CORPORATION 2001
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