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LT5526 High Linearity, Low Power Downconverting Mixer
FEATURES
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DESCRIPTIO
U APPLICATIO S
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Operation up to 2GHz Broadband RF, LO and IF Operation High Input IP3: +16.5dBm at 900MHz Typical Conversion Gain: 0.6dB at 900MHz SSB Noise Figure: 11dB at 900MHz On-Chip 50Ω LO Match Integrated LO Buffer: –5dBm Drive Level High LO-RF and LO-IF Isolation Low Supply Current: 28mA Typ Enable Function Single 5V Supply 16-Lead QFN (4mm × 4mm) Package
The LT®5526 is a low power broadband mixer optimized for high linearity applications such as point-to-point data transmission, cable infrastructure and wireless infrastructure systems. The device includes an internally matched high speed LO amplifier driving a double-balanced active mixer core. An integrated RF buffer amplifier provides excellent LO-RF isolation. The RF and IF ports can be easily matched across a broad range of frequencies for use in a wide variety of applications. The LT5526 offers a high performance alternative to passive mixers. Unlike passive mixers which have conversion loss and require high LO drive levels, the LT5526 delivers conversion gain at significantly lower LO input levels and is much less sensitive to LO power level variations.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Point-to-Point Data Communication Systems Wireless Infrastructure Cable Downlink Infrastructure High Linearity Receiver Applications
TYPICAL APPLICATIO
High Signal Level Frequency Downconversion
VCC 5V DC EN BIAS
OUTPUT POWER (dBm/TONE)
VCC2
VCC1
900MHz LNA
900MHz RF
+
140MHz IF
+
VGA
ADC
RF –
IF –
GND LT5526 LO+ LO –
LO INPUT –5dBm
5526 TA01
U
IF Output Power and IM3 vs RF Input Power (Two Input Tones)
0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –20 IM3 TA = 25°C fIF = 140MHz fRF = 900MHz fLO = 760MHz PLO = –5dBm –10 –15 –5 RF INPUT POWER (dBm/TONE) 0
5526 TA02
U
POUT
5526f
1
LT5526
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW
LO+ LO– NC NC
Supply Voltage ...................................................... 5.5V Enable Voltage ............................... –0.3V to VCC + 0.3V LO Input Power ............................................... +10dBm LO+ to LO– Differential DC Voltage ......................... ±1V RF Input Power ................................................ +10dBm RF+ to RF– Differential DC Voltage ....................... ±0.7V Operating Temperature Range ................ – 40°C to 85°C Storage Temperature Range ................. – 65°C to 125°C Junction Temperature (TJ)................................... 125°C
ORDER PART NUMBER
12 GND
16 15 14 13 NC 1 RF + 2 RF – 3 NC 4 5
EN
LT5526EUF
17
11 IF+ 10 IF– 9 GND
6
VCC1
7
VCC2
8
NC
UF PART MARKING 5526
UF PACKAGE 16-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB. NC PINS SHOULD BE GROUNDED
Consult LTC Marketing for parts specified with wider operating temperature ranges.
DC ELECTRICAL CHARACTERISTICS
VCC = 5V, EN = 3V, TA = 25°C (Note 3), unless otherwise noted. Test circuit shown in Figure 1.
PARAMETER Power Supply Requirements (VCC) Supply Voltage Supply Current Shutdown Current Enable (EN) Low = Off, High = On EN Input High Voltage (On) EN Input Low Voltage (Off) Enable Pin Input Current Turn-On Time (Note 5) Turn-Off Time (Note 5) EN = 5V EN = 0V 55 0.01 3 6 3 0.3 V V µA µA µs µs VCC = 5V EN = Low 3.6 5 28 5.3 33 100 V mA µA CONDITIONS MIN TYP MAX UNITS
AC ELECTRICAL CHARACTERISTICS
PARAMETER RF Input Frequency Range (Note 4) LO Input Frequency Range (Note 4) IF Output Frequency Range (Note 4)
(Notes 2, 3)
MIN TYP 0.1 to 2000 0.1 to 2500 0.1 to 1000 MAX UNITS MHz MHz MHz
CONDITIONS Requires RF Matching Requires DC Blocks Requires IF Matching
VCC = 5V, EN = 3V, TA = 25°C. Test circuits shown in Figures 1 and 2. (Notes 2, 3)
PARAMETER RF Input Return Loss LO Input Return Loss IF Output Return Loss LO Input Power CONDITIONS ZO = 50Ω, External Match ZO = 50Ω, External DC Blocks ZO = 50Ω, External Match MIN TYP 15 15 15 –10 to 0 MAX UNITS dB dB dB dBm
5526f
2
U
W
U
U
W W
W
LT5526
AC ELECTRICAL CHARACTERISTICS
PARAMETER RF to LO Isolation CONDITIONS
VCC = 5V, EN = 3V, TA = 25°C, PRF = –15dBm (–15dBm/tone for 2-tone IIP3 tests, ∆f = 1MHz), PLO = –5dBm, unless otherwise noted. Test circuits shown in Figures 1 and 2. (Notes 2, 3)
MIN TYP 69 55 50 0.6 0.6 0.4 –0.013 15.2 16.5 14.1 12.7 11.0 13.7 –65 –65 –55 –56 –74 –37 –75 –72 –48 –65 –68 –56 5 5 1 MAX UNITS dB dB dB dB dB dB dB/°C dBm dBm dBm dB dB dB dBm dBm dBm dBm dBm dBm dBc dBc dBc dBc dBc dBc dBm dBm dBm fRF = 350MHz, fIF = 70MHz, fLO = 420MHz fRF = 900MHz, fIF = 140MHz, fLO = 760MHz fRF = 1900MHz, fIF = 140MHz, fLO = 1760MHz fRF = 350MHz, fIF = 70MHz, fLO = 420MHz fRF = 900MHz, fIF = 140MHz, fLO = 760MHz fRF = 1900MHz, fIF = 140MHz, fLO = 1760MHz TA = –40°C to 85°C fRF = 350MHz, fIF = 70MHz, fLO = 420MHz fRF = 900MHz, fIF = 140MHz, fLO = 760MHz f.