LT5534 [Linear]

50MHz to 3GHz RF Power Detector with 60dB Dynamic Range; 50MHz到3GHz的RF功率检波器与60分贝动态范围


型号：	LT5534
厂家：	Linear
描述：	50MHz to 3GHz RF Power Detector with 60dB Dynamic Range 50MHz到3GHz的RF功率检波器与60分贝动态范围
文件：	总8页 (文件大小：193K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LT5534

50MHz to 3GHz

RF Power Detector

with 60dB Dynamic Range

FEATURES

DESCRIPTIO

The LT^®5534 is a 50MHz to 3GHz monolithic RF power

detector capable of measuring RF signals over a 60dB

dynamicrange.TheRFsignalinadecibelscaleisprecisely

convertedintoDCvoltageonalinearscale.The60dBinput

dynamic range is achieved using cascaded RF detectors

and RF limiters. Their outputs are summed to generate an

accuratelog-linearDCvoltageproportionaltotheinputRF

signal in dB. The output is buffered with a low output

impedance driver. The LT5534 delivers superior tempera-

ture stability (typical output variation within±1dB over the

full temperature range). The output responds in less than

40ns to a large RF input signal.

■

RF Frequency Range: 50MHz to 3GHz

■

Linear Dynamic Range: 60dB

■

Exceptional Accuracy over Temperature

and Power Supply

Fast Transient Response:

■

38ns Full-Scale Settling Time

■

Single 2.7V to 5.25V Supply

■

Low Supply Current: 7mA

■

Shutdown Current: 0.1µA

■

Tiny 6-Lead SC70 Package

APPLICATIO S

, LTC and LT are registered trademarks of Linear Technology Corporation.

■

RF Receive Power Management

■

RF Power Control

■

CATV Power Detection

Optical Receiver Gain Control

■

TYPICAL APPLICATIO

Output Voltage

50MHz to 3GHz RF Power Detector

vs RF Input Power

2.4

2.0

1.6

1.2

0.8

0.4

= 3V

AT 900MHz

0.1µF

100pF

LT5534

DET

OUT

1nF

INPUT

–1

–2

–3

47Ω

ENABLE

GND

= 25°C

= 85°C

5534 TA01

TA = –40C

–60

–40

–30

–20

–10

–50

RF INPUT POWER (dBm)

5534 G05

5534f

LT5534

W W U W

W U

ABSOLUTE MAXIMUM RATINGS

PACKAGE/ORDER INFORMATION

(Note 1)

Power Supply Voltage ........................................... 5.5V

Enable Voltage ................................................... 0V, V_CC

RF Voltage (+10dBm Equivalent) ............................ ±1V

Operating Ambient Temperature Range.. – 40°C to 85°C

Storage Temperature Range ................. –65°C to 125°C

Lead Temperature (Soldering, 10 sec).................. 300°C

ORDER PART

TOP VIEW

NUMBER

EN 1

6 RF

LT5534ESC6

GND 2

5 GND

4 V

OUT

SC6 PART

MARKING

SC6 PACKAGE

6-LEAD PLASTIC SC70

T_JMAX= 125°C, θ_JA= 256°C/W

LBGD

Consult LTC Marketing for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS

V_CC= 3V, EN = 3V, T_A= 25°C, source impedance = 50Ω, unless otherwise

noted. Test circuit shown in Figure 1. (Note 2)

PARAMETER

RF Input

CONDITIONS

MIN

TYP

MAX

UNITS

Frequency Range

Input Impedance

50 to 3000

MHz

kΩ

= 50MHz

RF Input Power Range

Dynamic Range (Note 3)

Output Slope

–58 to +2

dBm

±3dB Linearity Error, T = –40°C to 85°C

mV/dB

dB/°C

Output Variation vs Temperature

= –48dBm to –14dBm, T = –40°C to 85°C

0.007

= 900MHz

RF Input Power Range

Dynamic Range (Note 3)

Output Slope

–60 to 0

dBm

±3dB Linearity Error, T = –40°C to 85°C

mV/dB

dB/°C

Output Variation vs Temperature

= –48dBm to –14dBm, T = –40°C to 85°C

0.008

= 1900MHz

RF Input Power Range

Dynamic Range (Note 3)

Output Slope

–63 to –2

dBm

±3dB Linearity Error, T = –40°C to 85°C

36.6

mV/dB

dB/°C

dBm

Output Variation vs Temperature

Output Intercept

= –48dBm to –14dBm, T = –40°C to 85°C

0.012

–64

50Ω External Termination, T = –40°C to 85°C

–70

–58

= 2500MHz

RF Input Power Range

Dynamic Range (Note 3)

Output Slope

–63 to –3

dBm

±3dB Linearity Error, T = –40°C to 85°C

mV/dB

dB/°C

Output Variation vs Temperature

Output Interface

= –48dBm to –14dBm, T = –40°C to 85°C

0.025

Output DC Voltage

No RF Input Signal

142

240

Ω

Output Impedance

Output Bandwidth

MHz

Full-Scale Setting Time

Sourcing/Sinking

Input from No Signal to –2dBm, to 90%

10/200

mA/µA

5534f

LT5534

ELECTRICAL CHARACTERISTICS

V_CC= 3V, EN = 3V, T_A= 25°C, unless otherwise noted.

Test circuit shown in Figure 1. (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Power Up/Down

Turn-On Time

Turn-Off Time

EN = High (On)

EN = Low (Off)

Power Supply

Supply Voltage

Supply Current

Shutdown Current

200

800

0.9

0.6

2.7

5.25

µA

EN = High

EN = Low

0.1

Note 3: The linearity error is calculated by the difference between the

incremental slope of the output and the average output slope from

–48dBm to –14dBm. The dynamic range is defined as the range over

which the linearity error is within ±3dB.

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 temperature range are

assured by design, characterization and correlation with statistical process

control.

U W

TYPICAL PERFOR A CE CHARACTERISTICS ^{(Test circuit shown in Figure 1)}

Output Voltage vs Frequency

Linearity Error vs Frequency

Output Voltage vs RF Input Power

2.8

2.4

2.0

1.6

1.2

0.8

0.4

= 3V

= 25°C

= 3V

AT 50MHz

50MHz

900MHz

= 25°C

900MHz

50MHz

2.0

1.6

1.2

0.8

0.4

1.9GHz

2.5GHz

1.9GHz

–1

–2

–3

–1

–2

–3

= 25°C

= 85°C

= –40C

–30

RF INPUT POWER (dBm)

–10

–70 –60 –50 –40

–20

–30

RF INPUT POWER (dBm)

–10

–60

–40

–30

–20

–10

–70 –60 –50 –40

–20

–50

RF INPUT POWER (dBm)

5534 G01

5534 G03

5534 G02

_OUTVariation vs RF Input Power

Output Voltage vs RF Input Power

V_OUTVariation vs RF Input Power

2.4

2.0

1.6

1.2

0.8

0.4

= 3V AT 50MHz

= 3V

= 3V AT 900MHz

AT 900MHz

NORMALIZED AT 25°C

= –40°C

= 85°C

= –40°C

= 85°C

–1

–2

–3

–1

–2

–3

–1

–2

–3

= 25°C

= 85°C

= –40C

–60

–40

–30

–20

–10

–60

–40

–30

–20

–10

–50

–60

–40

–30

–20

–10

–50

RF INPUT POWER (dBm)

5534 G04

5534 G05

5534 G06

5534f

LT5534

TYPICAL PERFOR A CE CHARACTERISTICS

U W

(Test circuit shown in Figure 1)

Output Voltage vs RF Input Power

V_OUTVariation vs RF Input Power

Output Voltage vs RF Input Power

2.4

2.0

1.6

1.2

0.8

0.4

2.4

2.0

1.6

1.2

0.8

0.4

= 3V AT 1.9GHz

= 3V

NORMALIZED AT 25°C

AT 2.5GHz

AT 1.9GHz

= 85°C

= –40°C

–1

–2

–3

–1

–2

–3

–1

–2

–3

= 25°C

= 85°C

= 25°C

= 85°C

TA = –40C

–60

–40

–30

–20

–10

–50

–60

–40

–30

–20

–10

–60

–40

–30

–20

–10

–50

RF INPUT POWER (dBm)

5534 G09

5534 G07

5534 G08

Output Voltage Distribution

vs Temperature

Output Voltage vs RF Input Power

at V_CC= 3V and 5V

V_OUTVariation vs RF Input Power

2.8

2.4

RF P = –48dBm AT 1.9GHz

= 3V AT 2.5GHz

= 25°C

= –40°C

= 85°C

NORMALIZED AT 25°C

= 3V

50MHz

= 3V, 5V

2.0

1.6

1.2

0.8

0.4

= –40°C

1.9GHz

V = 3V, 5V

= 85°C

–1

–2

–3

–30

RF INPUT POWER (dBm)

–10

–60

–50

–40

–20

–60

–40

–30

–20

–10

–50

0.58

0.64 0.66 0.68 0.7

0.54 0.56

0.6 0.62

RF INPUT POWER (dBm)

OUT

(V)

5534 G11

5534 G10

5534 G12

Output Voltage Distribution

vs Temperature

Supply Voltage vs Supply Current

RF P = –14dBm AT 1.9GHz

= 25°C

= –40°C

= 85°C

= 3V

= 85°C

= 25°C

= –40°C

1.83

1.89

1.91

1.93

2.5

3.5

4.5

5.5

1.79

1.81

1.85 1.87

(V)

SUPPLY VOLTAGE (V)

OUT

5534 G13

5530 G14

5534f

LT5534

U W

(Test circuit shown in Figure 1)

Output Transient Response

TYPICAL PERFOR A CE CHARACTERISTICS

RF Input Return Loss vs Frequency

–5

1V/DIV

OUT

–10

–15

–20

–25

–30

INPUT

PULSED RF

0dBm AT 100MHz

1.5

2.5

0.5

50ns/DIV

RF INPUT FREQUENCY (GHz)

5534 G16

5534 G15

PI FU CTIO S

EN (Pin 1): Enable. When the input voltage is higher than

0.9V, the circuit is completely turned on. When the input

voltage is less than 0.6V, the circuit is turned off.

V_CC(Pin 4): Power Supply. This pin should be decoupled

using 100pF and 0.1µF capacitors.

RF (Pin 6): RF input. This pin is internally biased to

V_CC–0.18V.Acouplingcapacitormustbeusedtoconnect

to the RF signal source.

GND (Pins 2, 5): Ground.

V_OUT(Pin 3): RF Detector Output.

BLOCK DIAGRA

DET

–

OUT

RF LIMITER

REF

OFFSET

COMP

BIAS

GND

5534 BD

5534f

LT5534

TEST CIRCUIT

1nF

LT5534

0Ω

OPTIONAL

47Ω

GND

OPTIONAL

OUT

OPTIONAL

100pF

0.1µF

5534 F01

REF DES VALUE SIZE PART NUMBER

1nF

0402 AVX 04025C102JAT2A

0.1µF 0603 TAIYO YUDEN TMK107BJ104KA

100pF 0603 AVX 06035C101KAT2A

0603 OPTIONAL

47Ω 0402 OPTIONAL

0Ω

0603 OPTIONAL

Figure 1. Evaluation Circuit Schematic

Figure 3. Component Side Layout of Evaluation Board

Figure 2. Component Side Silkscreen of Evaluation Board

W U U

APPLICATIO S I FOR ATIO

The LT5534 is a logarithmic-based detector, capable of

measuring an RF signal over the frequency range from

50MHzto3GHz.The60dBlineardynamicrangeisachieved

withverystableoutputoverthefulltemperaturerangefrom

–40°C to 85°C. The absolute variation over temperature is

typicallywithin±1dBovera47dBdynamicrangeat1.9GHz.

matching components. A 47Ω resistor (R1) connected to

ground will provide better than 10dB input return loss up

to 2.5GHz. An additional 2nH inductance in series with R1

will provide improved input matching up to 3GHz. The

impedance vs frequency of the RF input is detailed in

Table 1.

The approximate linear RF input power range of the

LT5534 is from –62dBm to –2dBm with a 50Ω source

impedance. However, this range can be adjusted either

RF Input Port

The RF port is internally biased at V_CC-0.18V. The pin

should be DC blocked when connected to ground or other

upward or downward to tailor for a particular application

5534f

LT5534

W U U

APPLICATIO S I FOR ATIO

Table 1. RF Input Impedance

FREQUENCY

(MHz)

INPUT

IMPEDANCE (Ω)

S11

ANGLE (DEG)

200µA

MAG

0.938

0.934

0.922

0.908

0.900

0.896

0.893

0.889

0.883

0.879

0.873

0.866

0.862

0.848

0.834

0.826

0.822

–

1429-j429

947-j710

509-j609

250-j440

149-j344

96.8-j278

67.6-j229

49.7-j193

38.4-j165

30.8-j143

25.4-j125

21.4-j109

18.5-j96.2

16.6-j85.0

15.2-j75.7

13.7-j67.5

12.1-j60.1

–1.1

–2.9

OUT

100

200

–5.6

400

–9.9

5534 F04

600

–14.1

–18.3

–22.7

–27.3

–32.3

–37.3

–42.6

–48.0

–53.6

–59.6

–65.6

–71.8

–78.2

OUTPUT CURRENTS

FROM RF DETECTORS

800

1000

1200

1400

1600

1800

2000

2200

2400

2600

2800

3000

Figure 4. Simplified Circuit Schematic

of the Output Interface

terminated or open. The fastest output transient response

is achieved when a large signal is applied to the RF input

port. See the output transient response plot in the Typical

Performance Characteristics section.

When the output is terminated with a load capacitance

C_L, the slew rate is then limited to 200µA/(C_L+ 1.5pF). For

example, the slew rate is reduced to 17.4V/µs when C_L=

10pF. A capacitive load may result in output voltage

overshoot, which can be minimized with a series compen-

sation resistor R2 as shown in Figure 1. The suggested

resistor values for various capacitive loads are listed in

Table 2.

need. By simply inserting an attenuator in front of the RF

input, the power range is shifted higher by the amount of

the attenuation. Moreover, due to the high RF input

impedance of the LT5534, the detecting range can be

moved downward for better detection sensitivity by using

a narrow band L-C matching network. By this means, the

sensitivity of the detector can be extended to as low as –

75dBm. By changing the value of resistor R1, the sensi-

tivity of the detector can be fine-tuned within the range

from –75dBm to –62dBm. Though the range is adjust-

able, the overall linear dynamic range remains the same.

Table 2. Resistor Value for Capacitive Output

C5 (pF)

1.5

R2 (kΩ)

2.5

The optional RC network at the output (R2 and C5 on the

demo board) can also provide further output filtering, if

needed. The output bandwidth is primarily dictated by the

RC constant of this lowpass filter when its corner fre-

quency is less than 30MHz.

Output Interface

TheoutputinterfaceoftheLT5534isshowninFigure4.The

output currents from the RF detectors are summed and

converted into an output voltage, V_OUT. The maximum

chargingcurrentavailabletotheoutputloadisabout200µA.

TheinternalcompensationcapacitorC_Cisusedtoguaran-

tee stable operation for a large capacitive output load. The

slewrateis133V/µs,andthesmall-signaloutputbandwidth

is approximately 30MHz when the output is resistively

When a large signal (e.g., –2dBm) is present at the RF

inputport,theoutputvoltageswingcanbeashighas2.4V.

To assure proper operation of the chip, the minimum

resistive load at the output termination should be greater

than 18kΩ.

5534f

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.

LT5534

PACKAGE DESCRIPTIO

SC6 Package

6-Lead Plastic SC70

(Reference LTC DWG # 05-08-1638)

0.47

MAX

0.65

REF

1.80 – 2.20

(NOTE 4)

1.16 REF

0.96 MIN

INDEX AREA

(NOTE 6)

1.15 – 1.35

1.80 – 2.40

3.26 MAX 2.1 REF

(NOTE 4)

PIN 1

RECOMMENDED SOLDER PAD LAYOUT

PER IPC CALCULATOR

0.15 – 0.30

6 PLCS (NOTE 3)

0.65 BSC

0.10 – 0.40

0.80 – 1.00

0.00 – 0.10

REF

1.00 MAX

0.10 – 0.30

SC6 SC70 0802

0.10 – 0.18

(NOTE 3)

NOTE:

1. DIMENSIONS ARE IN MILLIMETERS

5. MOLD FLASH SHALL NOT EXCEED 0.254mm

6. DETAILS OF THE PIN 1 INDENTIFIER ARE OPTIONAL,

BUT MUST BE LOCATED WITHIN THE INDEX AREA

7. EIAJ PACKAGE REFERENCE IS EIAJ SC-70

2. DRAWING NOT TO SCALE

3. DIMENSIONS ARE INCLUSIVE OF PLATING

4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR

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300MHz to 7GHz Precision RF Power Detector

Precision V

Offset Control, Adjustable Gain and Offset

OUT

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5534f

LT/TP 0404 1K • PRINTED IN THE USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

●

(408) 432-1900 FAX: (408) 434-0507 www.linear.com

LINEAR TECHNOLOGY CORPORATION 2004

LT5534 [Linear]

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