LT5564fa峰值检波器

FEATURES

n n n n n n n

n

Time 15GHz RF Power Detector with ComparatorDESCRIPTION

The LTC®5564 is a precision, RF power detector for ap-plications in the 600MHz to 15GHz frequency range. The LTC5564 operates with input power levels from –24dBm to 16dBm.

A temperature compensated Schottky diode peak detector, gain-selectable operational amplifier, and fast comparator are combined in a small 16-lead 3mm × 3mm QFN package.The RF input signal is peak detected and then sensed by both a comparator and amplifier. The comparator provides a 9ns response time to input levels exceeding VREF along with a latch enable/disable function. The gain selectable operational amplifier provides a 350V/µs slew rate and 75MHz of demodulation bandwidth to the analog output.VOUTADJ and VREF pins allow for the adjustment of VOUT offset and VCOMP switch point voltages, respectively.

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

UltraFast is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

Higher frequency operation is achievable with reduced performance. Consult the factory for more information.

Temperature Compensated Schottky RF Peak DetectorWide Input Frequency Range: 600MHz to 15GHz Wide Input Power Range: –24dBm to 16dBm7ns Typical Response Time 75MHz Demodulation Bandwidth

Programmable Gain Settings for Improved SensitivityAdjustable Amplifier Output Offset Voltage

High Speed Comparator with Latch Enable: 9ns Typical Response Time

n 16-Lead 3mm × 3mm QFN Package

APPLICATIONS

RF Signal Presence Detectors for: 802.11a, 802.11b, 802.11g, 802.15, Optical Data Links, Wireless Data Modems, Wireless and Cable Infrastructuren 5.8GHz ISM Band Radiosn MMDS Microwave Linksn PA Power Supply Envelope Tracking Controln Fast Alarm

n RF Power Monitorn Envelope Detectorn Ultra-Wideband Radio n Radar Detector

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TYPICAL APPLICATION

Demo Board Schematic Optimized for 15GHz

VOUT

VOUT OUTPUT VOLTAGE (mV)

VOUT vs Input Power 2.7GHz

3400

320030002800260024002200

2000

180016001400

1200

10008006004002000

RFIN POWER (dBm)

5564 TA01b

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ABSOLUTE MAXIMUM RATINGS

I

Supply VoltagesI

I

VCCRF = VCCA = VCCP ............................................5.8VI

RFIN Voltage for VCCRF ≤ 5.5V ....................(VCCRF ± 2V) RFIN Power .........................................................16dBmICOMP, IVOUT .........................................................±10mAVOUTADJ, VREF, VCOMP, VOUT, G0, G1, LEN ...–0.3V to VCCOperating Temperature Range (Note 2)....–40°C to 85°CMax Junction Temperature .................................. 125°CStorage Temperature Range ..................–65°C to 150°C

(Note 1)

IIII

PIN CONFIGURATION

TOP VIEW

VCOMP

12VCCA

17GND

11VCCP10VOUT9NC

LEN

VOUTADJ

G0

G1

VCCRF

VREF

NC

RFIN1NC2GND3GND4

UD PACKAGE

16-LEAD (3mm × 3mm) PLASTIC QFN TJMAX = 125°C, θJA = 68°C/W, θJC = 7.5°C/W

EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB

ORDER INFORMATION

LEAD FREE FINISHLTC5564IUD#PBF

TAPE AND REELLTC5564IUD#TRPBF

PART MARKINGLFRF

PACKAGE DESCRIPTION

16-Lead (3mm × 3mm) Plastic QFN

TEMPERATURE RANGE–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: /leadfree/

For more information on tape and reel specifications, go to: /tapeandreel/

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating

PARAMETERSupply VoltageSupply Current

Amplifier CharacteristicsVOUT Output Offset

Supply Voltage = 5V, No RFIN

GAN1 GAN2 GAN4 GAN8

Supply Voltage = 3.3V, No RFIN GAN1 GAN2 GAN4 GAN8

l l

temperature range, otherwise specifications are at TA = 25°C. Supply voltage = VCCRF = VCCA = VCCP = 5V, GAIN1, CLOAD = 10pF, no RF input signal, unless otherwise noted.

CONDITIONS

l

MIN3.0

TYP44

MAX5.5

UNITS

VmA

195 195

290 295 315 360 280 280 290 315

395 395

mV mV mV mV mV mV mV mV

l l

185 185 385 385

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ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating

PARAMETER

VOUT Slew Rate Rise/Fall

CONDITIONS

Supply Voltage = 5V, VOUT 10% to 90%, VOUT = 1.1V (Note 3)

GAIN1, Pin = 10dBm to 16dBm GAIN2, Pin = 4dBm GAIN4, Pin = –2dBm GAIN8, Pin = –8dBm

Supply Voltage = 3.3V, VOUT 10% to 90%, VOUT = 1.1V (Note 3) GAIN1, Pin = 10dBm to 16dBm GAIN2, Pin = 4dBm GAIN4, Pin = –2dBm GAIN8, Pin = –8dBm

Demodulation Bandwidth

(Notes 4, 5)

GAIN1, VOUT = 500mV GAIN2, VOUT = 500mV GAIN4, VOUT = 500mV GAIN8, VOUT = 500mVGAIN1 VOUT = ±100mV (Note 5)(Note 5)Sourcing, RL = 2k

Supply Voltage = 5V, RFIN Step to 50% VOUT (Note 3) GAIN1, Pin = 10dBm to 16dBm GAIN2, Pin = 4dBm GAIN4, Pin = –2dBm GAIN8, Pin = –8dBm

Supply Voltage = 3.3V, RFIN Step to 50% VOUT (Note 3) GAIN1, Pin = 10dBm to 16dBm GAIN2, Pin = 4dBm GAIN4, Pin = –2dBm GAIN8, Pin = –8dBm

VOUT Output Voltage SwingComparator CharacteristicsComparator Response TimeComparator HysteresisIVREF Input CurrentRF CharacteristicsRFIN Frequency RangeRFIN AC Input ResistanceRFIN Input Shunt CapacitanceRFIN Input Power RangeDigital I/OLEN VIL/VIHG0 VIL/VIHG1 VIL/VIH

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: The LTC5564 is guaranteed functional within the operating temperature range from –40°C to 85°C.

0.80.80.8

VCCA – 0.8VCCA – 0.8VCCA – 0.8

VVV

(Note 6)

Frequency = 1000MHz, Power Level = 0dBmFrequency = 1000MHz, Power Level = 0dBm(Note 6)

0.6 to 151350.77–24 to 16

GHzΩpFdBm

10dBm to 16dBm RFIN Step to VCOMP 50% (Note 3)

910–2.3

nsmVµA

Supply Voltage = 3V

1.41.7

7.0 9.0 11.0 14.0 7.1 9.0 11.0 14.0

MIN

TYP 350/70 185/70 120/70 50/50 325/70 185/70 120/70 50/50 75 52 35 150/225

10MAX

temperature range, otherwise specifications are at TA = 25°C. Supply voltage = VCCRF = VCCA = VCCP = 5V, GAIN1, CLOAD = 10pF, no RF input signal, unless otherwise noted.

UNITS V/µs V/µs V/µs V/µs V/µs V/µs V/µs V/µs MHz MHz MHz MHzmVpFmA ns ns ns ns ns ns ns nsV

VOUTADJ Input RangeVOUT Load CapacitanceVOUT Output CurrentVOUT Response Time

Note 3: RFIN step from no power to stated level.

Note 4: See typical curve for bandwidth vs output voltage.Note 5: See Applications Information section.

Note 6: Specification is guaranteed by design and not 100% tested in production.

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TYPICAL PERFORMANCE CHARACTERISTICS

Demodulation Bandwidth

30VOUT –3dB CROSSOVER (MHz)

2010GAIN (dB)

0–10–20–30–40–50FREQUENCY (MHz)

5564 G01

Demodulation Bandwidth vs VOUT

8070605040

3020100200

250

300

350VOUT (mV)

5564 G02

VOUT Pulse Response, PIN = 8dBm

VOUT500mV/DIV

VCC = 5V

ASK MODULATION FREQUENCY 2.7GHzGAIN1

10ns/DIV

5564 G03

400

450

500

VOUT Pulse Response = –10dBm

400

VOUT Offset vs Supply Voltage

VOUT (mV)

VOUT Offset vs Temperature GAIN1

350330310

290270250

350

VOUT50mV/DIV

VCC = 5V

ASK MODULATION FREQUENCY 2.7GHzGAIN1

10ns/DIV

5564 G04

VOUT (mV)

300250

VCC (V)

5564 G05

230TEMPERATURE (°C)

5565 G06

VOUT Offset vs Temperature GAIN2

350

330

410390370350

VOUT (mV)

VOUT (mV)

290

330310290270

250

5565 G07

VOUT Offset vs Temperature GAIN4

590

540490440VOUT (mV)

390340290

240190

–20

TEMPERATURE (°C)

5565 G08

VOUT Offset vs Temperature GAIN8

310

270

250–20

TEMPERATURE (°C)

230140TEMPERATURE (°C)

5565 G09

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TYPICAL PERFORMANCE CHARACTERISTICS

Supply Current vs Supply Voltage

484644ICC (mA)

4240383634

40003600VOUT OUTPUT VOLTAGE (mV)3200

VOUT vs Input Power 700MHz

VOUT OUTPUT VOLTAGE (mV)4800440040003600320028002400200016001200800400

VOUT vs Input Power 1.9GHz

28002400

2000

16001200800400

33.54

4.5

VCC (V)

55.5

5564 G10

–10–8–6–4–20246810121416

RFIN INPUT POWER (dBm)

5564 G24

–10

–8–6–4–20246810121416

RFIN POWER (dBm)

5564 G25

3400

320030002800260024002200

2000

180016001400

1200

1000800600

4002000

RFIN POWER (dBm)

5564 G11

VOUT vs Input Power 2.7GHzVOUT vs Input Power 2.7GHz

3600

320028002400200016001200800400

RFIN POWER (dBm)

5564 G12

32002800VOUT OUTPUT VOLTAGE (mV)

VOUT vs Input Power 5.8GHz

VOUT OUTPUT VOLTAGE (mV)

VOUT OUTPUT VOLTAGE (mV)

2400200016001200800400

–10–8–6–4–20246810121416

RFIN POWER (dBm)

5564 G13

VOUT vs Input Power 8GHz

2400VOUT OUTPUT VOLTAGE (mV)200016001200800400

–10–8–6–4–20

1416

RFIN INPUT POWER (dBm)

5564 G26

VOUT vs Input Power 10GHz

16001400VOUT OUTPUT VOLTAGE (mV)12001000800600400200

–24–20–16–12–8–404

RFIN POWER (dBm)

8

1216

5564 G27

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TYPICAL PERFORMANCE CHARACTERISTICS

VOUT vs Input Power 10GHz

4800

440040003600320028002400200016001200800400

–24–20–16–12–8–404

RFIN POWER (dBm)

8

1216

5564 G28

VOUT vs Input Power 12GHz

18001600VOUT OUTPUT VOLTAGE (mV)

VOUT OUTPUT VOLTAGE (mV)

1000

VOUT vs Input Power 15GHz

VOUT OUTPUT VOLTAGE (mV)

140012001000800600400200

800

600

400

–10–8–6–4–20246810121416

RFIN POWER (dBm)

5564 G14

–4–20RFIN INPUT POWER (dBm)

5564 G29

Comparator Threshold Voltage vs RF Input Power

3600RISING THRESHOLD VOLTAGE (mV)32002800

24002000160012008004000–10

–6

–22610RFIN POWER (dBm)

14

18

5564 G15

Comparator Rising Edge Threshold vs Frequency

20001800RISING EDGE VREF (mV)16001400

12001000800600400

800012000

4000

FREQUENCY (MHz)

16000

5564 G16

3530PERCENT OF UNITS (%)

25201510

50

GAIN1 VOUT/RFIN Histogram

25

GAIN2 VOUT/RFIN Histogram

20PERCENT OF UNITS (%)

15

10

5

1.321.331.341.351.361.371.381.391.401.41

GAIN (V/V)

5564 G17

GAIN (V/V)

5564 G18

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TYPICAL PERFORMANCE CHARACTERISTICS

GAIN4 VOUT/RFIN Histogram

20

1210

GAIN8 VOUT/RFIN Histogram

4540PERCENT OF UNITS (%)

3530252015105

GAIN2/GAIN1 Histogram

PERCENT OF UNITS (%)

PERCENT OF UNITS (%)

15

8642

10

5

GAIN (V/V)

5564 G19

GAIN (V/V)

5564 G20

GAIN2/GAIN1

5564 G21

GAIN4/GAIN2 Histogram

40

35PERCENT OF UNITS (%)

PERCENT OF UNITS (%)

GAIN4/GAIN2

5564 G22

GAIN8/GAIN4 Histogram

15

302520151050

10

5

GAIN8/GAIN4

5564 G23

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PIN FUNCTIONS

RFIN (Pin 1): RF Input Voltage. A coupling capacitor must be used to connect to the RF signal source. This pin has an internal 250Ω termination, an internal Schottky diode detector and an internal 8pF reservoir capacitor.NC (Pins 2, 9, 16): No Connect. These pins should be left unconnected by the user for best RF performance.GND (Pins 3, 4, Exposed Pad Pin 17): These pins should be tied to system ground. See Applications Information for best practices.

LEN (Pin 5): Comparator Latch Enable Input. VCOMP will be latched when LEN is high and transparent when LEN is low.VOUTADJ (Pin 6): Amplifier Output Offset Adjust. When left floating, the VOUT pin of the amplifier will be at its nominal quiescent output offset value. See the Applications Infor-mation section for adjustment range.

G0, G1 (Pins 7, 8): Amplifier Gain Selection. Logic low or high levels on the G0 and G1 pins will change the internal amplifier gain, bandwidth and slew rate characteristics. See the Applications Information section for gain setting codes.VOUT (Pin 10): Detector Amplifier Output.VCCP (Pin 11): High Current Power Supply Pin.VCCA (Pin 12): Analog Power Supply Pin.VCOMP (Pin 13): Comparator Output.

VREF (Pin 14): Comparator Negative Input. Apply an ex-ternal reference voltage to this pin.VCCRF (Pin 15): RF Power Supply Pin.

SIMPLIFIED BLOCK DIAGRAM

LEN

VFigure 1. Simplified Block Diagram

VCOMPVREFVOUT

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APPLICATIONS INFORMATION

Operation

The LTC5564 is a fast RF detector with a high speed amplifier and comparator. This product integrates these functions to provide RF detection over frequencies ranging from 600MHz to 15GHz. These functions include an RF Schottky peak detector, internally compensated operational amplifier, and a comparator as shown in Figure 1. The LTC5564 has selectable amplifier gains, amplifier output offset adjustment and comparator latch enable capabilities.Amplifier

The high speed amplifier offers four gain settings and is capable of driving a 1.7mA load with an output swing range of approximately 295mV to VCC – 1.6V. See Table 1 for gain setting operation.

The VOUTADJ pin provides output DC offset adjustment to satisfy various interface requirements. Setting VOUT to 500mV also provides the maximum demodulation bandwidth in each gain mode. See Electrical and Typical Performance Characteristics curve. See Table 1 for the

Table 1. Gain Mode and Typical VOUTADJ Operation

PING1GNDGNDVCCAVCCA

G0GNDVCCAGNDVCCA

GAIN MODEGAIN1GAIN2GAIN4GAIN8

DESCRIPTION

Minimum Gain Setting (VOUT/RFIN ≈ 1.5dB)VOUT/RFIN Increased 6dBVOUT/RFIN Increased 12dBVOUT/RFIN Increased 18dB

REQUIRED VOUTADJ FOR A GIVEN DC OUTPUT OFFSETVOUTADJ = 0.95 VOUT – 0.174VOUTADJ = (VOUT – 0.07)/2.10VOUTADJ = (VOUT + 0.05)/3.16VOUTADJ = (VOUT + 0.25)/5.26

typical VOUTADJ voltage for the desired VOUT DC output offset in each gain setting.RF Detector

The internal temperature compensated Schottky diode peak detector converts the RF input signal to a low frequency signal. The detector demonstrates excellent efficiency and linearity over a wide range of input power levels. The Schottky diode is nominally biased at 180µA and drives a parallel reservoir capacitor-resistor network of 8pF and parator

The high speed comparator compares the external refer-ence voltage on the VREF pin to the internal signal voltage VP from the peak detector and produces the output logic signal VCOMP . VP is the internal comparator positive input as shown in Figure 1.

LEN provides latch enable/disable functionality as shown in Figure 2.

Note: Valid range for VOUT ≈ 0.195V ≤ VOUT ≤ VCC – 1.6

LEN

VREFVPVCOMP

5564 F02

VOUT

TRANSPARENTVOUTLATCHEDVOUT

TRANSPARENT

Figure 2. LTC5564 Comparator Latch Enable Function

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APPLICATIONS INFORMATION

Propagation Delay, Slew Rate and Response TimeThe LTC5564 has been designed for high slew rate op-eration. For RF input power levels of 10dBm to 16dBm and a GAIN1 setting, the internal amplifier will slew at 350V/µs. In a given gain setting slew rate will be maximized for larger input power levels. Slew rate will degrade with smaller RFIN amplitude signals or when the amplifier gain is increased. See Electrical Characteristics.

The LTC5564 has been designed to function as a positive peak detector. Consequently, the device responds to a rising signal at the RF detector input much more rapidly than a falling signal. Correspondingly, the rising edge of VOUT transitions much more rapidly than the falling edge transitions as shown in Figure 3.

When operating in unity gain with a 10dBm to 16dBm RF input signal, the propagation delay to fifty percent VOUT is approximately 7.0ns.

The operational amplifier has been internally compensated to provide 75MHz bandwidth with VOUT = 500mV and a GAIN1 mode setting. With no RF input the output offset will be approximately 290mV. Lowering the output offset will degrade bandwidth performance. See the Typical Performance Characteristics.

Loading, Bypass Capacitors and Board Layout The LTC5564 has been designed to directly drive a capaci-tive load of 10pF at VOUT. When driving a capacitive load greater than 10pF a series resistance should be added between VOUT and the load to maintain good stability. This resistance should be placed as close to VOUT as possible. See Table 2 for typical series resistor values for various capacitive loads.

Table 2. Typical Series Resistor Values for VOUT Capacitive Loading

CLOADUp to 10pF11pF to 20pF21pF to 100pFGreater Than 100pF

R SERIES 0Ω40Ω68Ω100Ω

Good layout practice and proper use of bypass capacitors will improve circuit performance and reduce the possibility of measurement error. Bypass capacitors should be used for pins VCCRF, VCCA, VCCP, VOUTADJ and VREF. Bypass capacitors should be connected as close to the LTC5564 as possible. All ground return path lengths and ohmic losses should be minimized. See Figure 5 in the Applica-tions Information section for the demo board schematic showing these bypass capacitances.

The LTC5564 return path for all supply currents is through the Pin 17 exposed pad. A high resistance path from the Pin 17 exposed pad to power supply ground will cause a VOUT output offset error. Board layout and connections that minimize ohmic losses from the Pin 17 exposed pad to power supply ground will reduce this error. Measure-ments being made relative to LTC5564 ground should be made as close to the Pin 17 exposed pad to reduce errors.

VOUT500mV/DIV

VCC = 5V

ASK MODULATION FREQUENCY 2.7GHzGAIN1

10ns/DIV

5564 F03

Figure 3. VOUT Pulse Response, PIN = 8dBm

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APPLICATIONS INFORMATION

Applications

The LTC5564 can be used as a self-standing signal strength measurement receiver for a wide range of input signals from –24dBm to 16dBm and frequencies from 600MHz to 15GHz.

In addition to power detection, the LTC5564 may be used as a demodulator for AM and ASK modulated signals. Depending on the application the RSSI may be split into two branches to provide AC-coupled data (e.g., audio) and a DC-coupled RSSI output for signal strength measure-ment and AGC.

VEVENT

TAGE

Figure 4. 600MHz to 15GHz Power Detector

VOUT

Figure 5. Demo Board Schematic Optimized for 15GHz

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PACKAGE DESCRIPTION

UD Package

16-Lead Plastic QFN (3mm × 3mm)

(Reference L

TC DWG # 05-08-1691)

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

BOTTOM VIEW—EXPOSED PAD× 45° CHAMFER

NOTE:

1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WEED-2)2. DRAWING NOT TO SCALE

3. ALL DIMENSIONS ARE IN MILLIMETERS

4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE

MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE5. EXPOSED PAD SHALL BE SOLDER PLATED

6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE

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REVISION HISTORY

REVA

DATE02/11

DESCRIPTION

Replaced and renamed Typical Application drawingAdded new curves to Typical Performance CharacteristicsRevised Figure 5

PAGE NUMBER

15, 611

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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.

TYPICAL APPLICATION

600MHz to 15GHz RF Power Detector

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COMMENTS

300MHz to 3GHz, Temperature Compensated, 2.7V to 6V Supply

100kHz to 1GHz, Temperature Compensated, 2.7V to 6V Supply44dB Dynamic Range, Temperature Compensated, SC70 Package36dB Dynamic Range, Low Power Consumption, SC70 PackagePrecision VOUT Offset Control, Shutdown, Adjustable GainPrecision VOUT Offset Control, Shutdown, Adjustable OffsetPrecision V Offset Control, Adjustable Gain and Offset

25ns Response Time, Comparator Reference Input, Latch Enable Input, –26dBm to +12dBm Input Range

±1dB Output Variation Over Temperature, 38ns Response Time, Log Linear Response

Low Frequency to 1GHz, 83dB Log Linear Dynamic Range±0.8dB Accuracy Over Temperature

40MHz to 2.7GHz, ±0.5dB Accuracy Over Temperature

±1dB Accuracy Over Temperature, Log Linear Response, 1.4mA at 3.3V40dB Dynamic Detection Range, Integrated 12-Bit Serial Output ADC, ±1dB Accuracy Over Temperature

40MHz to 10GHz Operation, ±0.5dB Linearity Single-Ended RF Output— Requires No External Balun Transformer

Up to 60dB Dynamic Range, ±0.5dB Accuracy Over Temperature, 40dB Channel-to-Channel Isolation with Single-Ended RF Inputs

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(408) 432-1900 ● FAX: (408) 434-0507 ●

1630 McCarthy Blvd., Milpitas, CA 95035-7417

LINEAR TECHNOLOGY CORPORATION 2010

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