LT5570IDD-PBF LINER [Linear Technology], LT5570IDD-PBF Datasheet

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LT5570IDD-PBF

Manufacturer Part Number
LT5570IDD-PBF
Description
Fast Responding, 40MHz to 2.7GHz Mean-Squared Power Detector
Manufacturer
LINER [Linear Technology]
Datasheet
FEATURES
APPLICATIONS
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TYPICAL APPLICATION
INPUT
Frequency Range: 40MHz to 2.7GHz
Accurate RMS Power Measurement of High Crest
Factor Modulated Waveforms
Linear DC Output vs Input Power in dBm
Linear Dynamic Range: Up to 60dB
Exceptional Accuracy over Temperature: ±0.3dB
Fast Response Time: 0.5μs Rise Time,
8μs Fall Time
Low Supply Current: 26.5mA
Low Impedance Output Buffer Capable of Driving
High Capacitance Load
Small 3mm × 3mm 10-Lead DFN Package
RMS Power Measurement
RF Power Control
Receive and Transmit Gain Control
W-CDMA, CDMA2000, TD-SCDMA, WiMAX
RF Instrumentation
RF
1 F
40MHz to 2.7GHz Mean-Squared Power Detector
1:4
1nF
NC
1
2
3
4
5
V
IN
DEC
IN
GND
CC
+
LT5570
FLTR
DNC
DNC
OUT
EN
10
9
8
7
6
ENABLE
V
OUT
22nF
5V
DESCRIPTION
The LT
Mean-Squared RF power detector. It is capable of RMS
measurement of an AC signal with wide dynamic range,
from –52dBm to 13dBm depending on frequency. The
power of the AC signal in an equivalent decibel-scaled
value is precisely converted into DC voltage on a linear
scale, independent of the crest factor of the waveforms. The
LT5570 is suitable for precision RF power measurement and
level control for a wide variety of RF standards, including
CDMA, W-CDMA, CDMA2000, TD-SCDMA and WiMAX.
The DC output is buffered with a low output impedance
amplifi er capable of driving a high capacitance load.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 7262661, 7259620, 7268608.
Output Voltage, Linearity Error vs Input Power, 25°C (2140 MHz)
to 2.7GHz Mean-Squared
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Fast Responding, 40MHz
®
5570 is a 40MHz to 2.7GHz monolithic Logarithmic
2.4
2.0
0.8
1.6
1.2
0.4
0
–45
–35
RF INPUT POWER (dBm)
–25
Power Detector
–15
–5
CW
4CH WCDMA
3CH CDMA2000
5
5570 TA01b
15
LT5570
3
2
–1
–3
1
0
–2
1
5570f

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LT5570IDD-PBF Summary of contents

Page 1

FEATURES n Frequency Range: 40MHz to 2.7GHz n Accurate RMS Power Measurement of High Crest Factor Modulated Waveforms n Linear DC Output vs Input Power in dBm n Linear Dynamic Range 60dB n Exceptional Accuracy over Temperature: ±0.3dB ...

Page 2

... ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LT5570IDD#PBF LT5570IDD#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: For more information on tape and reel specifi ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T Figures 1 and 3. (Notes 2 and 3). PARAMETER CONDITIONS f = 880MHz RF RF Input Power Range CW Input; 1:4 Balun Matched into 50Ω Source Linear Dynamic Range (Note ...

Page 4

LT5570 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T Figures 1 and 3. (Notes 2 and 3). PARAMETER CONDITIONS Enable (EN) Low = Off, High = On EN Input High Voltage (On) EN Input Low Voltage (Off) Enable ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage vs Frequency 2 25°C A 2.0 1.6 1.2 0.8 0.4 0 –55 –45 –35 –25 RF INPUT POWER (dBm) Output Voltage, Linearity Error vs RF Input Power, 500MHz 2.4 2.0 1.6 1.2 0.8 ...

Page 6

LT5570 TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage, Linearity Error vs RF Input Power, 2140MHz 2.4 2.0 1.6 1.2 0.8 0.4 0 –45 –25 –15 –35 RF INPUT POWER (dBm) Output Voltage, Linearity Error vs RF Input Power, 2700MHz 2.4 2.0 1.6 ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Output Transient Response 22nF 3 PULSE ON PULSE 2.5 OFF AT 2140MHz 2 10dBm 0dBm IN 1 –10dBm IN 1 –20dBm IN 0.5 P ...

Page 8

LT5570 PIN FUNCTIONS V (Pin 1): Power Supply Pin for the Bias Circuits. Typi- CC cal current consumption is 26.5mA. This pin should be externally bypassed with 1nF and 1μF chip capacitors. + – (Pins 2, 4): ...

Page 9

TEST CIRCUITS RF INPUT REF DES VALUE SIZE C2, C4 1nF 0402 AVX 0402ZC102KAT C1 22nF 0402 AVX 0402YC223KAT C3 1μF 0603 Taiyo Yuden LMK107BJ105MA R1 100k 0402 CRCW0402100KFKED FREQUENCY T1 880MHz MURATA LDB21869M20C-001 2140MHz ...

Page 10

LT5570 TEST CIRCUITS INPUT 1nF OPT 0 REF DES VALUE SIZE C2, C4, C7 1nF 0402 AVX 0402ZCI02KAT C1 22nF 0402 AVX 0402YC223KAT C3 1μF 0603 Taiyo Yuden LMK107BJ105MA Figure 3. Test Schematic ...

Page 11

APPLICATIONS INFORMATION The LT5570 is a mean-squared RF power detector, capable of measuring an RF signal over the frequency range from 40MHz to 2.7GHz, independent of input waveforms with different crest factors such as CW, CDMA, WCDMA, TD- SCDMA and ...

Page 12

LT5570 APPLICATIONS INFORMATION 2.4 2.0 1.6 1.2 0.8 0.4 0.0 –10 –50 –40 –30 –20 INPUT POWER (dBm) Figure 6. Output Voltage and Linearity Error vs RF Input Power in Single-ended Input Confi guration The DEC pin can be tied ...

Page 13

APPLICATIONS INFORMATION 22nF 7 DC VOLTAGE VARIATION OUTPUT AC RIPPLE 0.01 0 MODULATION FREQUENCY (MHz) Figure 8. Output DC Voltage Variation and Residual Ripple vs AM Modulation Frequency ...

Page 14

LT5570 APPLICATIONS INFORMATION 2.0 AT 2140MHZ 10dBm IN 1 PULSE ON 1.6 PULSE OFF 1.4 1.2 1.0 0.8 0.6 WITH FILTERING 0.4 WITHOUT 0.2 FILTERING TIMES (μs) ...

Page 15

PACKAGE DESCRIPTION 3.50 0.05 1.65 0.05 2.15 0.05 (2 SIDES) 0.25 0.05 0.50 BSC 2.38 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2). CHECK THE ...

Page 16

LT5570 RELATED PARTS PART NUMBER DESCRIPTION Infrastructure LT5514 Ultralow Distortion, IF Amplifi er/ADC Driver with Digitally Controlled Gain LT5515 1.5GHz to 2.5GHz Direct Conversion Quadrature Demodulator LT5516 0.8GHz to 1.5GHz Direct Conversion Quadrature Demodulator LT5517 40MHz to 900MHz Quadrature Demodulator ...

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