LT5504EMS8#TRPBF [Linear]
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| 型号： | LT5504EMS8#TRPBF |
| 厂家： | 
Linear |
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LT5504
800MHz to 2.7GHz
RF Measuring Receiver
U
DESCRIPTIO
FEATURES
The LT®5504 is an 800MHz to 2700MHz monolithic inte-
grated measuring receiver, capable of detecting a wide
dynamic range RF signal from –75dBm to +5dBm. The
logarithm of the RF signal is precisely converted into a
linear DC voltage. The LT5504 consists of RF/IF limiters,
an LO buffer amplifier, a limiting mixer, a 3rd-order
450MHz integrated low pass filter, RF/IF detectors and an
output interface. The ultrawide dynamic range is achieved
by simultaneously measuring the RF signal and a down-
converted IF signal obtained using the on-chip mixer and
an external local oscillator. The RF- and IF-detected sig-
nalsaresummedtogenerateanaccuratelinearDCvoltage
proportional to the input RF voltage (or power) in dB. The
output is buffered with a low output impedance driver.
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
RF Frequency Range: 800MHz to 2.7GHz
■
Ultra Wide Dynamic Range: 75dB at 900MHz
■
Wide Power Supply Range: 2.7V to 5.25V
■
Low Supply Current: 14.7mA at 3V
■
8-Lead MS0P Package
U
APPLICATIO S
■
RSSI Measurements
■
Receive AGC
■
Transmit Power Control
■
ASK and Envelope Demodulation
■
GSM/TDMA/CDMA/WCDMA
U
TYPICAL APPLICATIO
3V
C2
1nF
C1
100pF
Output Voltage and Slope
Variation vs RF Input Power
V
LT5504
CC
6
4
2.4
2.0
1.6
1.2
0.8
0.4
0
f
f
= 900MHz
= 240MHz
RF
IF
AVERAGE SLOPE:23mV/dB
OUTPUT
V
OUT
2
R2
200Ω
0
C3
10pF
RF
IF
IF
DETECTOR
RF
INPUT
• • •
+
DETECTOR
DETECTOR
RF
–2
–4
–6
R1
82Ω
–
RF
LO
LO
INPUT
ENABLE
EN
–80 –70 –60 –50 –40 –30 –20 –10
PIN (dBm)
0
10
5504 TA01a
GND
5504 TA01b
5504f
1
LT5504
W W U W
U
W
U
ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
ORDER PART
Power Supply Voltage ............................................ 5.5V
VOUT, EN ................................................................ 0,VCC
LO Input Power .................................................... 6dBm
RF Input Power Differential (50Ω, 5.5V)............. 24dBm
RF Input Power Single-Ended (50Ω, 5.5V) ......... 18dBm
Operating Ambient Temperature..............–40°C to 85°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
NUMBER
V
RF
RF
1
2
3
4
8 V
7 V
6 LO
5 EN
CC
CC
OUT
+
–
LT5504EMS8
GND
MS8 PACKAGE
8-LEAD PLASTIC MSOP
MS8 PART MARKING
LTGP
TJMAX = 150°C, θJA = 160°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
TA = 25°C. VCC = 3V, PLO = –10dBm, unless otherwise noted. (Notes 2, 3)
SYMBOL
RF Input
PARAMETER
CONDITIONS
MIN
TYP
800 to 2700
1.7
MAX
UNITS
MHz
V
f
Frequency Range
Input Impedance
DC Voltage
RF
(Note 6)
Internally Biased
LO Input
f
Frequency Range
Input Return Loss
DC Voltage
850 to 3100
14
MHz
dB
LO
Internally Matched to 50Ω
Internally Biased
0.82
V
P
LO Power
–16 to –8
dBm
LO
LO to RF Leakage
900MHz
1.9GHz
2.5GHz
–50
–45
–40
dBc
dBc
dBc
IF Frequency
f
Frequency
50 to 450
MHz
IF
Output Voltage at f = 900MHz, f = 1140MHz
RF
LO
Linear Dynamic Range (Note 4)
Output Voltage
66
75
dB
Input = –70dBm
Input = –20dBm
Input = 0dBm
0.4
1.6
2.1
V
V
V
Average Slope
Input from –50dBm to –20dBm
16
60
23
mV/dB
Output Voltage at f = 1900MHz, f = 2140MHz
RF
LO
Linear Dynamic Range (Note 4)
Output Voltage
72
dB
Input = –70dBm
Input = –20dBm
Input = 0dBm
0.35
1.52
1.9
V
V
V
Average Slope
Input from –50dBm to –20dBm
16
23
mV/dB
5504f
2
LT5504
ELECTRICAL CHARACTERISTICS
TA = 25°C. VCC = 3V, PLO = –10dBm, unless otherwise noted. (Notes 2, 3)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage at f = 2500MHz, f = 2260MHz
RF
LO
Linear Dynamic Range (Note 4)
Output Voltage
58
70
dB
Input = –70dBm
Input = –20dBm
Input = 0dBm
0.3
1.45
1.8
V
V
V
Average Slope
Input from –50dBm to –20dBm
16
23
mV/dB
Output Interface
Power Up/Down
Current Drive Capability
400
µA
Output Noise Spectral Density
At 100KHz
At 10MHz
3.9
0.32
µV/√Hz
µV/√Hz
Output Response Time (Note 5)
RF Input Pin from No Signal to 0dBm
200
ns
t
Turn ON Time (Note 5)
400
4
ns
µs
kΩ
V
ON
Turn OFF Time (Note 5)
Input Resistance
30
Enable Turn ON Voltage (Note 7)
Disable Turn OFF Voltage (Note 7)
0.6 • V
0.4 • V
CC
CC
V
Power Supply
V
Supply Voltage
Supply Current
Shutdown Current
2.7
5.25
22
V
mA
µA
CC
I
14.7
CC
30
Note 1: Absolute Maximum Ratings are those values beyond which the
life of a device may be impaired.
Note 4: The Linear Dynamic Range is defined as the range over which the
output slope is at least 50% of the average slope from –50dBm to –20dBm.
Note 2: Tests are performed as shown in the configuration of Figure 5.
Note 5: The output voltage is settled to the full specification within 1dB.
Note 6: Refer to Figure 1 and Applications Information.
Note 7: Refer to Pin Functions description.
Note 3: Specifications over the –40°C to 85°C temperature range are
guaranteed by design, characterization and correlation with statistical
process controls.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage
vs RF Input Power and Frequency
Supply Current vs Supply Voltage
and Temperature
Power Up Response Time
20
18
16
14
12
10
8
2.4
2.0
1.6
1.2
0.8
0.4
0
f
= 240MHz
V
= 3V
IF
CC
RF INPUT POWER = 0dBm
T
= 85°C
A
V
OUT
1V/DIV
T
= 25°C
A
f
= 900MHz
f
= 1.9GHz
RF
RF
ON
T
= –40°C
A
f
= 2.5GHz
RF
ENABLE
1V/DIV
OFF
2.5
3.5
4.0
4.5
5.0
5.5
3.0
–80 –70 –60 –50 –40 –30 –20 –10
PIN (dBm)
0
10
2µs/DIV
SUPPLY VOLTAGE (V)
5504 G03
5504 G02
5504 G01
5504f
3
LT5504
U W
(VCC = 3V unless otherwise noted).
TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage and Slope Variation
Output Voltage and Slope Variation
vs RF Input Power and Temperature,
vs RF Input Power and Temperature,
Output Slope Variation vs
fRF = 900MHz
fRF = 2.5GHz
RF Input Power and Frequency
6
6
2.4
2.0
1.6
1.2
0.8
0.4
0
2.4
2.0
1.6
1.2
0.8
0.4
0
6
4
f
= 240MHz
f
= 240MHz
f = 240MHz
IF
AVERAGE SLOPE: 23mV/dB
IF
IF
AVERAGE SLOPE: 23mV/dB
AVERAGE SLOPE: 23mV/dB
4
4
2
2
2
f
= 900MHz
T = 25°C
A
RF
T
= 25°C
A
0
0
0
T
= 85°C
A
T
A
= 85°C
f
= 1.9GHz
RF
–2
–4
–6
–2
–4
–2
–2
–4
–6
50% VARIATION OR
SLOPE = 11.5mV/dB
T
= 25°C
A
T
= 25°C
A
T
= –40°C
A
T
= –40°C
T = –40°C
A
A
T
= –40°C
A
f
= 2.5GHz
RF
0
10
–80 –70 –60 –50 –40 –30 –20 –10
PIN (dBm)
0
10
–80 –70 –60 –50 –40 –30 –20 –10
PIN (dBm)
–80 –70 –60 –50 –40 –30 –20 –10
PIN (dBm)
0
10
5504 G06
5504 G05
5504 G04
Output Voltage and Slope Variation
vs RF Input Power and Temperature,
Output Voltage and Slope Variation
vs RF Input Power and IF Frequency
Output Voltage and Slope Variation
fIF = 240MHz
vs RF Input Power and Supply Voltage
6
2.4
2.0
1.6
1.2
0.8
0.4
0
6
6
2.4
2.0
1.6
1.2
0.8
0.4
0
2.4
2.0
1.6
1.2
0.8
0.4
0
f
= 1.9GHz
RF
f
= 1.9GHz
f = 1.9GHz
RF
f = 240MHz
IF
RF
AVERAGE SLOPE: 23mV/dB
AVERAGE SLOPE: 23mV/dB
4
4
4
f
= 70MHz
IF
V
CC
= 5.25V
2
2
2
T
= 25°C
A
240MHz
V
CC
= 5.25V
T
= –40°C
A
0
0
0
70MHz
T
= 85°C
400MHz
V
CC
= 2.7V
A
–2
–4
–6
f
= 240MHz
–2
–4
–6
–2
–4
–6
IF
T
= –40°C
A
V
CC
= 2.7V
T
= 25°C
A
f
= 400MHz
IF
–80 –70 –60 –50 –40 –30 –20 –10
PIN (dBm)
0
10
–80 –70 –60 –50 –40 –30 –20 –10
PIN (dBm)
0
10
–80 –70 –60 –50 –40 –30 –20 –10
PIN (dBm)
0
10
5504 G07
5504 G08
5504 G09
Output Voltage and Slope Variation
vs RF Input Power and Temperature,
Output Voltage and Slope Variation
vs RF Input Power and Temperature,
fIF = 400MHz
fIF = 70MHz
Output Response Time
6
6
2.4
2.0
1.6
1.2
0.8
0.4
0
2.4
2.0
1.6
1.2
0.8
0.4
0
f
= 1.9GHz
f
= 1.9GHz
RF
RF
AVERAGE SLOPE: 23mV/dB
AVERAGE SLOPE: 23mV/dB
4
4
V
OUT
2
2
1V/DIV
T
= 25°C
T
= 25°C
A
A
T
= –40°C
T
= –40°C
A
A
0
0
T
= 85°C
T
= 85°C
A
A
PULSED
RF
900MHz
0dBm
1V/DIV
–2
–4
–6
–2
–4
–6
T
= 25°C
A
T
= 25°C
A
T
= –40°C
A
T
= –40°C
A
–80 –70 –60 –50 –40 –30 –20 –10
PIN (dBm)
0
10
–80 –70 –60 –50 –40 –30 –20 –10
PIN (dBm)
0
10
100ns/DIV
5504 G12
5504 G11
5504 G10
5504f
4
LT5504
U
U
U
PI FU CTIO S
VCC (Pins 1, 8 ): Power Supply Pins. These pins must be
tied together at the part as close as possible, and should
be decoupled using 1000pF capacitors.
RF+ (Pin 2): Positive RF Input Pin.
RF– (Pin 3): Negative RF Input Pin.
GND (Pin 4): Ground Pin.
EN (Pin 5): Enable Pin. The on/off threshold voltage
is about VCC/2. When the input voltage is higher than
0.6 • VCC, the circuit is completely turned on. When the
input voltage is less than 0.4 • VCC, the circuit is turned off.
LO (Pin 6): Local Oscillator Input Pin.
VOUT (Pin 7): Output Pin.
W
BLOCK DIAGRA
V
V
CC
CC
8
1
V
7
OUT
+
DET
DET
DET
DET
LIMITING
MIXER
LPF
+
2
3
RF
RF
LIMITER
IF
IF
• • •
LIMITER
LIMITER
–
RF
LO
BUFFER
ENABLE
6
4
5
5504 BD
LO
GND
EN
W U U
U
APPLICATIO S I FOR ATIO
The LT5504 consists of the following sections: RF/IF
limiters, limiting mixer, RF/IF detectors, LO buffer ampli-
fier, 3rd-order integrated low pass filter (LPF), output
interface and bias circuitry.
RF Limiter
The differential input impedance of the RF limiter is shown
in Figure 1. A 1:1 input transformer can be used to achieve
50Ωbroadbandmatchingwithan82Ωshuntresistor(R1)
at the inputs as shown in Figure 5.
An RF signal ranging from 800MHz to 2.7GHz is detected
by the RF and IF detectors using a proprietary technique.
The down-converted IF signal is band limited by the on-
chipLPF,reducingbroadbandnoise,andthusanultrawide
dynamicrangesignalcanbemeasured.TheRFmeasuring
receiver is essentially a logarithmic voltage detector. The
measured output voltage is directly proportional to the RF
signal voltage. An internal temperature compensation
circuit results in a highly temperature-stable output volt-
age.
The 1:1 RF input transformer can also be replaced with a
narrow band single-ended-to-differential conversion cir-
cuit using three discrete elements as shown in Figure 2.
Their nominal values are listed in Table 1. Due to the
parasitics of the PCB, these values may require adjust-
ment.
5504f
5
LT5504
U
W
U U
APPLICATIO S I FOR ATIO
2.5
2.0
1.5
1.0
0.5
0
f
= 1.9GHz
RF
WITH SINGLE-ENDED-TO-
DIFFERENTIAL INPUT CIRCUIT
1: 63.56Ω
–j98.05Ω
WITH 1:1 INPUT TX
900.00MHz
2: 26.69Ω
–j42.90Ω
3
1.90GHz
3: 28.88Ω
–j27.76Ω
1
2.50GHz
–80 –70 –60 –50 –40 –30 –20 –10
PIN (dBm)
0
10
2
5504 F03
START: 100MHz
STOP:3GHz
5504 F01
Figure 3. The Output Voltage vs RF Input Power
Figure 1. Differential RF Input Impedance
Limiting Mixer and LPF
MATCHING NETWORK
The amplified RF signal is down-converted using the
limitingmixerandLOsignal.Theresultingsignalisfiltered
bythe3rd-order,450MHz,integratedlowpassfilter(LPF).
Only the desired IF signal is passed to the IF limiters for
furtherdetection.Anyothermixingproducts,includingLO
feedthrough, are much reduced to maximize sensitivity.
The receiver’s sensitivity is thus defined by the LPF band-
width.
C
S1
3.3pF
RF
INPUT
+
–
TO RF
L
SH
3.3nH
C
S2
3.3pF
TO RF
5504 F02
Figure 2. RF Input Matching Network at 1900MHz
IF Limiter
Figure 3 shows the output voltage vs RF input power
response for these two input terminations. The voltage
gain of the single-ended-to-differential conversion circuit
is:
The IF signal is then amplified through the multiple limiter
stages for further signal detection. All DC offsets, includ-
ing LO signal self-mixing, are eliminated by an internal DC
offset cancellation circuit. Nevertheless, care should be
taken in component placement and in PCB layout to
minimize LO coupling to the RF port.
R
50
IN
GAIN = 20•LOG
= 3dB,
Output Interface
where RIN = 100Ω is the narrow band input impedance.
The output interface of the LT55O4 is shown in Figure 4.
The output currents from the RF and IF detectors are
Thus, the output voltage curve in this case is shifted to the
left by about 3dB.
summed and converted into an output voltage, VOUT
.
The maximum charging current available to the output
load is about 400µA. An internal compensation capacitor
CC is used to guarantee stable operation for a large
capacitive output load. The slew rate is 80V/µs and the
small signal output bandwidth is approximately 5MHz
whentheoutputisresistivelyterminated.Whentheoutput
is loaded with a large capacitor CL, the slew rate is limited
5504f
Table 1. The Component Values of Matching Network LSH, CS1
and CS2
f
(MHz)
L
SH
(nH)
C /C (pF)
S1 S2
IF
900
12.0
3.9
3.3
2.2
1.5
1900
2500
2700
3.3
2.7
2.4
6
LT5504
U
W U U
APPLICATIO S I FOR ATIO
to 400µA/CL. For example, the slew rate is reduced to 4V/
µs when CL = 100pF.
Applications
TheLT5504canbeusedasaself-standingsignalstrength-
measuring receiver (RSSI) for a wide range of input
signals from – 75dBm to +5dBm, for frequencies from
800MHz to 2.7GHz.
V
CC
400µA
C
C
+
–
V
OUT
TheLT5504canbeusedasademodulatorforAMandASK
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 output, and
DC coupled, RSSI output for signal strength measure-
ments and AGC. Refer to Figure 5.
OUTPUT CURRENTS
FROM RF AND IF
DETECTORS
5504 F04
Figure 4. Simplified Circuit Schematic of the Output Interface
The LT5504 can also be used as a wide range RF power
detector for transmit power control.
U
TYPICAL APPLICATIO S
V
R3
10k
CC
C2
100pF
C3
1nF
C1
RF
INPUT
JUMPER
1
2
3
4
8
7
6
5
100pF
V
V
CC
CC
R2
200Ω
LT5504
+
RF
RF
V
V
OUT
OUT
R1
82Ω
C4
1nF
LO
INPUT
–
LO
T1
C7
TOKO
GND
EN
100pF
R4
617DB-1022
R5
500k
20k
5504 F04
Figure 5. LT5504 Evaluation Board Circuit Schematic
Figure 6.Component Side Silkscreen of Evaluation Board
Figure 9. Bottom Side Layout
of Evaluation Board
Figure 7. Component Side
Layout of Evaluation Board
Figure 8.Bottom Side
Silkscreen of Evaluation Board
5504f
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
LT5504
U
PACKAGE DESCRIPTIO
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
0.889 ± 0.127
(.035 ± .005)
0.52
(.206)
REF
8
7 6 5
5.23
3.00 ± 0.102
(.118 ± .004)
NOTE 4
3.2 – 3.45
(.206)
4.88 ± 0.1
(.192 ± .004)
(.126 – .136)
MIN
DETAIL “A”
0.254
(.010)
0° – 6° TYP
GAUGE PLANE
0.65
(.0256)
BSC
0.42 ± 0.04
(.0165 ± .0015)
TYP
1
2
3
4
0.53 ± 0.015
(.021 ± .006)
1.10
(.043)
MAX
0.86
(.34)
REF
RECOMMENDED SOLDER PAD LAYOUT
DETAIL “A”
0.18
(.077)
SEATING
PLANE
NOTE:
0.22 – 0.38
(.009 – .015)
0.13 ± 0.05
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
(.005 ± .002)
0.65
(.0256)
BCS
MSOP (MS8) 1001
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
Dual LNA Gain Settling 13.5dB/–14dB at 2.5GHz, Double Balanced Mixer,
1.8V ≤ V ≤ 5.25V
LT5500
LT5502
LT5503
Receiver Front End
SUPPLY
400MHz Quadrature Demodulator with RSSI
1.8V to 5.25V Supply, 70MHz to 400MHz IF, 84dB Limiting Gain,
90dB RSSI Range
1.2GHz to 2.7GHz Direct IQ Modulator and
Upconverting Mixer
1.8V to 5.25V Supply, Four-Step RF Power Control,
120MHz Modulation Bandwidth
LTC5505
LT5506
300MHz to 3.5GHz RF Power Detector
>40dB Dynamic Range, Temperature Compensated, 2.7V to 6V Supply
500MHz Quadrature IF Demodulator with VGA
1.8V to 5.25V Supply, 40MHz to 500MHz IF, –4dB to 57dB
Linear Power Gain
LTC5507
LTC5508
LTC5509
LT5511
LT5512
LT5515
LT5516
LT5522
100kHz to 1GHz RF Power Detector
48dB Dynamic Range, Temperature Compensated, 2.7V to 6V Supply
44dB Dynamic Range, Temperature Compensated, SC70 Package
36dB Dynamic Range, SC70 Package
300MHz to 7GHz RF Power Detector
300MHz to 3GHz RF Power Detector
High Signal Level Upconverting Mixer
High Signal Level Downconverting Mixer
1.5GHz to 2.5GHz Direct Conversion Demodulator
RF Output to 3GHz, 17dBm IIP3, Integrated LO Buffer
DC-3GHz, 20dBm IIP3, Integrated LO Buffer
20dBm IIP3, Integrated LO Quadrature Generator
0.8GHz to 1.5GHz Direct Conversion Quadrature Demodulator 21.5dBm IIP3, Integrated LO Quadrature Generator
600MHz to 2.7GHz High Signal Level Mixer
25dBm IIP3 at 900MHz, 21.5dBm IIP3 at 1.9GHz, Matched 50Ω RF and
LO Ports, Integrated LO Buffer
LTC5532
300MHz to 7GHz Precision RF Power Detector
Precision VOUT Offset Control, Adjustable Gain and Offset Voltage
5504f
LT/TP 0305 500 • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
●
●
© LINEAR TECHNOLOGY CORPORATION 2002
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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