LT5534ESC6#TR - Linear Technology

LT5534

5534fc

TYPICAL APPLICATION

DESCRIPTION

50MHz to 3GHz

RF Power Detector

with 60dB Dynamic Range

The LT

5534 is a 50MHz to 3GHz monolithic RF power

detector capable of measuring RF signals over a 60dB

dynamic range. The RF signal in a decibel scale is pre-

cisely converted into DC voltage on a linear scale. The

60dB input dynamic range is achieved using cascaded RF

detectors and RF limiters. Their outputs are summed to

generate an accurate log-linear DC voltage proportional

to the input RF signal in dB. The output is buffered with a

low output impedance driver. The LT5534 delivers superior

temperature stability (typical output variation within ±1dB

over the full temperature range). The output responds in

less than 40ns to a large RF input signal.

FEATURES

APPLICATIONS

n RF Frequency Range: 50MHz to 3GHz

n Linear Dynamic Range: 60dB

n Exceptional Accuracy over Temperature

and Power Supply

n Fast Transient Response:

38ns Full-Scale Settling Time

n Single 2.7V to 5.25V Supply

n Low Supply Current: 7mA

n Shutdown Current: 0.1µA

n Tiny 6-Lead SC70 Package

n RF RSSI and ACC

n RF Power Control

n CATV Power Detection

n Optical Receiver Gain Control

50MHz to 3GHz RF Power Detector Output Voltage

vs RF Input Power

DETDETDETDETDET

1nF

47Ω

ENABLE

INPUT

VOUT

VCC

GND

100pF

LT5534

0.1µF

VOUT

5534 TA01

RF INPUT POWER (dBm)

–60

OUT

(V)

LINEARITY ERROR (dB)

0.4

0.8

1.2

1.6

2.4

–50 –40 –30 –20

5534 TA01b

–10 0

2.0

–3

–2

–1

TA = 25°C

TA = 85°C

TA = –40°C

VCC = 3V

AT 900MHz

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

LT5534

5534fc

ABSOLUTE MAXIMUM RATINGS

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

Enable Voltage .....................................................0V, VCC

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

(Note 1)

ELECTRICAL CHARACTERISTICS

VCC = 3V, EN = 3V, TA = 25°C, source impedance = 50Ω, unless otherwise

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

PARAMETER CONDITIONS MIN TYP MAX UNITS

RF Input

Frequency Range 50 to 3000 MHz

Input Impedance 2 kΩ

fRF = 50MHz

RF Input Power Range –58 to +2 dBm

Dynamic Range (Note 3) ±3dB Linearity Error, TA = –40°C to 85°C 60 dB

Output Slope 44 mV/dB

Output Variation vs Temperature PIN = –48dBm to –14dBm, TA = –40°C to 85°C 0.007 dB/°C

fRF = 900MHz

RF Input Power Range –60 to 0 dBm

Dynamic Range (Note 3) ±3dB Linearity Error, TA = –40°C to 85°C 60 dB

Output Slope 41 mV/dB

Output Variation vs Temperature PIN = –48dBm to –14dBm, TA = –40°C to 85°C 0.008 dB/°C

fRF = 1900MHz

RF Input Power Range –63 to –2 dBm

Dynamic Range (Note 3) ±3dB Linearity Error, TA = –40°C to 85°C 61 dB

Output Slope 31 36.6 43 mV/dB

Output Variation vs Temperature PIN = –48dBm to –14dBm, TA = –40°C to 85°C 0.012 dB/°C

Output Intercept 50Ω External Termination, TA = –40°C to 85°C –70 –64 –58 dBm

fRF = 2500MHz

RF Input Power Range –63 to –3 dBm

Dynamic Range (Note 3) ±3dB Linearity Error, TA = –40°C to 85°C 60 dB

PIN CONFIGURATION

EN 1

GND 2

VOUT 3

6 RF

5 GND

4 VCC

TOP VIEW

SC6 PACKAGE

6-LEAD PLASTIC SC70

TJMAX = 125°C, θJA = 256°C/W

ORDER INFORMATION

LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE

LT5534ESC6#PBF LT5534ESC6#TRPBF LBGD 6-Lead Plastic SC70 –40°C to 85°C

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

Consult LTC Marketing for information on non-standard lead based finish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

LT5534

5534fc

ELECTRICAL CHARACTERISTICS

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: Specifications over the –40°C to 85°C temperature range are assured

by design, characterization and correlation with statistical process control.

VCC = 3V, EN = 3V, TA = 25°C, source impedance = 50Ω, unless otherwise

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

PARAMETER CONDITIONS MIN TYP MAX UNITS

Power Up/Down

Turn-On Time 200 ns

Turn-Off Time 800 ns

EN = High (On) 0.9 V

EN = Low (Off) 0.6 V

Power Supply

Supply Voltage 2.7 5.25 V

Supply Current EN = High 5 7 9 mA

Shutdown Current EN = Low 0.1 10 µA

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.

TYPICAL PERFORMANCE CHARACTERISTICS

Output Voltage vs Frequency Linearity Error vs Frequency Output Voltage vs RF Input Power

(Test circuit shown in Figure 1)

RF INPUT POWER (dBm)

–70

1.6

2.0

2.8

–40 –20

5534 G01

1.2

0.8

–60 –50 –30 –10 0

0.4

2.4

OUT

(V)

VCC = 3V

TA = 25°C

50MHz 1.9GHz

2.5GHz

900MHz

RF INPUT POWER (dBm)

–70

LINEARITY ERROR (dB)

–40 –20

5534 G02

–1

–60 –50 –30 –10 0

–2

–3

50MHz VCC = 3V

TA = 25°C

900MHz

1.9GHz

2.5GHz

RF INPUT POWER (dBm)

–60

OUT

(V)

LINEARITY ERROR (dB)

0.4

0.8

1.2

1.6

2.4

–50 –40 –30 –20

5534 G03

–10 0

2.0

–3

–2

–1

TA = 25°C

TA = 85°C

TA = –40°C

VCC = 3V

AT 50MHz

TYPICAL PERFORMANCE CHARACTERISTICS

PARAMETER CONDITIONS MIN TYP MAX UNITS

Output Slope 35 mV/dB

Output Variation vs Temperature PIN = –48dBm to –14dBm, TA = –40°C to 85°C 0.025 dB/°C

Output Interface

Output DC Voltage No RF Input Signal 0 142 380 mV

Output Impedance 32 Ω

Output Bandwidth 30 MHz

Full-Scale Setting Time Input from No Signal to –2dBm, to 90% 38 ns

Sinking/Sourcing 10/200 mA/µA

VCC = 3V, EN = 3V, TA = 25°C, unless otherwise noted. Test circuit shown in Figure 1. (Note 2)

LT5534

5534fc

TYPICAL PERFORMANCE CHARACTERISTICS

VOUT Variation vs RF Input Power Output Voltage vs RF Input Power

VOUT Variation vs RF Input Power

(Test circuit shown in Figure 1)

RF INPUT POWER (dBm)

–60

–3

OUT

VARIATION (dB)

–2

–1

–50 –40 –30 –20

5534 G04

–10 0

TA = –40°C

TA = 85°C

VCC = 3V AT 50MHz

NORMALIZED AT 25°C

RF INPUT POWER (dBm)

–60

OUT

(V)

LINEARITY ERROR (dB)

0.4

0.8

1.2

1.6

2.4

–50 –40 –30 –20

5534 G05

–10 0

2.0

–3

–2

–1

TA = 25°C

TA = 85°C

TA = –40°C

VCC = 3V

AT 900MHz

RF INPUT POWER (dBm)

–60

–3

OUT

VARIATION (dB)

–2

–1

–50 –40 –30 –20

5534 G06

–10 0

TA = –40°C

TA = 85°C

VCC = 3V AT 900MHz

NORMALIZED AT 25°C

Output Voltage vs RF Input Power

VOUT Variation vs RF Input Power Output Voltage vs RF Input Power

RF INPUT POWER (dBm)

–60

OUT

(V)

LINEARITY ERROR (dB)

0.4

0.8

1.2

1.6

2.4

–50 –40 –30 –20

5534 G07

–10 0

2.0

–3

–2

–1

TA = 25°C

TA = 85°C

TA = –40°C

VCC = 3V

AT 1.9GHz

RF INPUT POWER (dBm)

–60

–3

OUT

VARIATION (dB)

–2

–1

–50 –40 –30 –20

5534 G08

–10 0

TA = –40°C

TA = 85°C

VCC = 3V AT 1.9GHz

NORMALIZED AT 25°C

RF INPUT POWER (dBm)

–60

OUT

(V)

LINEARITY ERROR (dB)

0.4

0.8

1.2

1.6

2.4

–50 –40 –30 –20

5534 G09

–10 0

2.0

–3

–2

–1

TA = 25°C

TA = 85°C

TA = –40°C

VCC = 3V

AT 2.5GHz

LT5534

5534fc

TYPICAL PERFORMANCE CHARACTERISTICS

VOUT Variation vs RF Input Power

Output Voltage vs RF Input Power

at VCC = 3V and 5V

Output Voltage Distribution

vs Temperature

Output Voltage Distribution

vs Temperature Supply Voltage vs Supply Current

(Test circuit shown in Figure 1)

RF INPUT POWER (dBm)

–60

–3

OUT

VARIATION (dB)

–2

–1

–50 –40 –30 –20

5534 G10

–10 0

TA = –40°C

TA = 85°C

VCC = 3V AT 2.5GHz

NORMALIZED AT 25°C

RF INPUT POWER (dBm)

–60

1.6

2.0

2.8

–40 –20

5534 G11

1.2

0.8

–50 –30 –10 0

0.4

2.4

OUT

(V)

TA = 25°C

50MHz

VCC = 3V, 5V

1.9GHz

VCC = 3V, 5V

VOUT (V)

PERCENTAGE DISTRIBUTION (%)

0.54 0.62 0.66

5534 G12

0.6 0.7

0.56 0.58 0.64 0.68

RF PIN = –48dBm AT 1.9GHz

VCC = 3V

TA = 25°C

TA = –40°C

TA = 85°C

VOUT (V)

PERCENTAGE DISTRIBUTION (%)

1.79 1.87 1.91

5534 G13

1.85

1.81 1.83 1.89 1.93

TA = 25°C

TA = –40°C

TA = 85°C

RF PIN = –14dBm AT 1.9GHz

VCC = 3V

SUPPLY VOLTAGE (V)

2.5

SUPPLY CURRENT (mA)

33.5 4 4.5

5530 G14

5 5.5

TA = 85°C

TA = 25°C

TA = –40°C

RF Input Return Loss vs Frequency Output Transient Response

RF INPUT FREQUENCY (GHz)

–30

RETURN LOSS (dB)

–25

–20

–15

–10

0.5 1 1.5 2

5534 G15

2.5 3

–5

50ns/DIV

1V/DIV

5534 G16

INPUT

PULSED RF

0dBm AT 100MHz

VOUT

LT5534

5534fc

PIN FUNCTIONS

BLOCK DIAGRAM

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.

GND (Pins 2, 5): Ground.

VOUT (Pin 3): RF Detector Output.

VCC (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

VCC – 0.18V. A coupling capacitor must be used to connect

to the RF signal source.

VREF

VOUT

5534 BD

VCC

OFFSET

COMP

DETDET

BIAS

RF LIMITER

DETDETDET

GND

2 5 1

RF LIMITERRF LIMITERRF LIMITER +

–

Figure 1. Evaluation Circuit Schematic

GND

VOUT

GND

VCC

LT5534

0Ω

OPTIONAL

VOUT

OPTIONAL

100pF

1nF

VCC

5534 F01

0.1µF

47Ω

OPTIONAL

REF DES

VALUE

1nF

0.1µF

100pF

47Ω

0Ω

SIZE

0402

0603

0402

0603

PART NUMBER

AVX 04025C102JAT2A

TAIYO YUDEN TMK107BJ104KA

AVX 06035C101KAT2A

OPTIONAL

TEST CIRCUIT

LT5534

5534fc

TEST CIRCUIT

APPLICATIONS INFORMATION

Figure 2. Component Side Silkscreen of Evaluation Board Figure 3. Component Side Layout of Evaluation Board

The LT5534 is a logarithmic-based detector, capable of

measuring an RF signal over the frequency range from

50MHz to 3GHz. The 60dB linear dynamic range is

achieved with very stable output over the full temperature

range from –40°C to 85°C. The absolute variation over

temperature is typically within ±1dB over a 47dB dynamic

range at 1.9GHz.

RF Input Port

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

should be DC blocked when connected to ground or other

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 upward or

Table 1. RF Input Impedance

FREQUENCY

(MHz)

INPUT

IMPEDANCE (Ω)

S11

MAG ANGLE (DEG)

50 1429-j429 0.938 –1.1

100 947-j710 0.934 –2.9

200 509-j609 0.922 –5.6

400 250-j440 0.908 –9.9

600 149-j344 0.900 –14.1

800 96.8-j278 0.896 –18.3

1000 67.6-j229 0.893 –22.7

1200 49.7-j193 0.889 –27.3

1400 38.4-j165 0.883 –32.3

1600 30.8-j143 0.879 –37.3

1800 25.4-j125 0.873 –42.6

2000 21.4-j109 0.866 –48.0

2200 18.5-j96.2 0.862 –53.6

2400 16.6-j85.0 0.848 –59.6

2600 15.2-j75.7 0.834 –65.6

2800 13.7-j67.5 0.826 –71.8

3000 12.1-j60.1 0.822 –78.2

LT5534

5534fc

downward to tailor for a particular application need. By

simply inserting an attenuator in front of the RF input, the

power range is shifted higher by the amount of the attenu-

ation. 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 sensitivity of the

detector can be fine-tuned within the range from –75dBm

to –62dBm. Though the range is adjustable, the overall

linear dynamic range remains the same.

Output Interface

The output interface of the LT5534 is shown in Figure 4.

The output currents from the RF detectors are summed

and converted into an output voltage, VOUT. The maximum

charging current available to the output load is about

200µA. The internal compensation capacitor CC is used

to guarantee stable operation for a large capacitive output

load. The slew rate is 133V/µs, and the small-signal output

bandwidth is approximately 30MHz when the output is

resistively 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

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

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

CL = 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.

Table 2. Resistor Value for Capacitive Output

C5 (pF) R2 (kΩ)

1.5 5

5 4

10 2.5

20 2

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 frequency

is less than 30MHz.

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

input port, the output voltage swing can be as high as

2.4V. To assure proper operation of the chip, the minimum

resistive load at the output termination should be greater

than 18kΩ.

Figure 4. Simplified Circuit Schematic

of the Output Interface

–

VOUT

5534 F04

200µA

OUTPUT CURRENTS

FROM RF DETECTORS

APPLICATIONS INFORMATION

LT5534

5534fc

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 representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

REVISION HISTORY

REV DATE DESCRIPTION PAGE NUMBER

B 8/10 Revised Output DC Voltage minimum and maximum values in Electrical Characteristics section 3

Updated package drawing in Package Description section 10

C 12/10 Corrected part numbers in Order Information 2

(Revision history begins at Rev B)

LT5534

5534fc

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2004

LT 1210 REV C • PRINTED IN USA

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Supply, –7dB to 56dB Linear Power Gain

1.15 – 1.35

(NOTE 4)

1.80 – 2.40

0.15 – 0.30

6 PLCS (NOTE 3)

SC6 SC70 1205 REV B

1.80 – 2.20

(NOTE 4)

0.65 BSC

PIN 1

0.80 – 1.00

1.00 MAX

0.00 – 0.10

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. DETAILS OF THE PIN 1 IDENTIFIER ARE OPTIONAL,

BUT MUST BE LOCATED WITHIN THE INDEX AREA

7. EIAJ PACKAGE REFERENCE IS EIAJ SC-70

8. JEDEC PACKAGE REFERENCE IS MO-203 VARIATION AB

2.8 BSC

0.47

MAX

0.65

REF

RECOMMENDED SOLDER PAD LAYOUT

PER IPC CALCULATOR

1.8 REF

1.00 REF

INDEX AREA

(NOTE 6)

0.10 – 0.18

(NOTE 3)

0.26 – 0.46

GAUGE PLANE

0.15 BSC

0.10 – 0.40

SC6 Package

6-Lead Plastic SC70

(Reference LTC DWG # 05-08-1638 Rev B)