LT5521 Mixer Datasheet

LT5521 Datasheet, PDF, Equivalent


Part Number

LT5521

Description

Very High Linearity Active Mixer

Manufacture

Linear

Total Page 16 Pages
Datasheet
Download LT5521 Datasheet


LT5521
FEATURES
s Wideband Output Frequency Range to 3.7GHz
s +24.2dBm IIP3 at 1.95GHz RF Output
s Low LO Leakage: –42dBm
s Integrated LO Buffer: Low LO Drive Level
s Single-Ended LO Drive
s Wide Single Supply Range: 3.15V to 5.25V
s Double-Balanced Active Mixer
s Shutdown Function
s 16-Lead (4mm × 4mm) QFN Package
U
APPLICATIO S
s Cellular, W-CDMA, PHS and UMTS Infrastructure
s Cable Downlink Infrastructure
s Wireless Infrastructure
s Fixed Wireless Access Equipment
s High Linearity Mixer Applications
LT5521
Very High Linearity
Active Mixer
DESCRIPTIO
The LT®5521 is a very high linearity mixer optimized for
low distortion and low LO leakage applications. The chip
includes a high speed LO buffer with single-ended input
and a double-balanced active mixer. The LT5521 requires
only –5dBm LO input power to achieve excellent distor-
tion and noise performance, while reducing external drive
circuit requirements. The LO buffer is internally 50
matched for wideband operation.
With a 250MHz input, a 1.7GHz LO and a 1.95GHz output
frequency, the mixer has a typical IIP3 of +24.2dBm,
–0.5dB conversion gain and a 12.5dB noise figure.
The LT5521 offers exceptional LO-RF isolation, greatly
reducing the need for output filtering to meet LO suppres-
sion requirements.
The device is designed to work over a supply voltage range
from 3.15V to 5.25V.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
IF
INPUT
BPF 1nF
10pF
1nF
1:1
110
IN+
6.8pF
IN
LO INPUT
–5dBm
6.8pF
LO GND
OUT+
OUT
110
BIAS
EN VCC VCC VCC
2.7nH
4:1
2.7nH
1nF
5V DC
1µF
5521 TA01
82pF
BPF
82pF
PA
RF
OUTPUT
Fundamental, 3rd Order
Intermodulation Distortion
vs Input Power
20
0
PFUND
–20
–40
IM3
–60
–80
–100
–14 –12 –10 –8 –6 –4 –2
PIN (dBm)
fIF = 250MHz
fLO = 1.7GHz
fRF = 1.95GHz
PLO = –5dBm
TA = 25°C
02 4 6
5521 TA02
5521f
1

LT5521
LT5521
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Power Supply Voltage ........................................... 5.5V
Enable Voltage ............................... –0.2V to VCC + 0.2V
LO Input Power ................................................ +10dBm
LO Input DC Voltage ..................................... 0V to 1.5V
IF Input Power ................................................. +10dBm
Difference Voltage Across Output Pins ................ ±1.5V
Maximum Pin 2 or Pin 3 Current ......................... 34mA
Operating Ambient Temperature Range .. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Maximum Junction Temperature .......................... 125°C
PACKAGE/ORDER INFORMATION
TOP VIEW
GND 1
IN+ 2
IN3
GND 4
16 15 14 13
12 OUT+
11 GND
17
10 GND
9 OUT
5678
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
ORDER PART
NUMBER
LT5521EUF
UF PART
MARKING
5521
Consult LTC Marketing for parts specified with wider operating temperature ranges.
DC ELECTRICAL CHARACTERISTICS VCC = 5V, EN = 2.9V, TA = 25°C unless otherwise noted.
Test circuit shown in Figure 1. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX
Supply Voltage
3.15 5.25
Supply Current
82 98
Shutdown Current
EN = 0.2V
20 100
Enable (EN) Low = Off, High = On
Enable Mode
EN = High
2.9
Disable Mode
EN = Low
0.2
Enable Current
EN = 5V
137
Shutdown Enable Current
EN = 0.2V
0.1
Turn-On Time (Note 3)
200
Turn-Off Time (Note 4)
200
LO Voltage (Pin 15)
Internally Biased
0.96
Input Voltage (Pins 2, 3)
VCC = 5V, Internally Biased
VCC = 3.3V, Internally Biased
2.20
0.46
UNITS
V
mA
µA
V
V
µA
µA
ns
ns
V
V
V
AC ELECTRICAL CHARACTERISTICS VCC = 5V, EN = 2.9V, TA = 25°C unless otherwise noted.
Test circuit shown in Figure 1. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX
LO Frequency Range
10 to 4000
Input Frequency Range
10 to 3000
Output Frequency Range
10 to 3700
LO Input Power
–5 1
LO Return Loss
Output Return Loss
ZO = 50, fLO = 1700MHz
Requires Matching
12
12
Input Return Loss (Pins 2, 3)
Requires Matching
15
2
UNITS
MHz
MHz
MHz
dBm
dB
dB
dB
5521f


Features U U FEATURES s Wideband Output Frequenc y Range to 3.7GHz s +24.2dBm IIP3 at 1. 95GHz RF Output s Low LO Leakage: –42 dBm s Integrated LO Buffer: Low LO Driv e Level s Single-Ended LO Drive s Wide Single Supply Range: 3.15V to 5.25V s D ouble-Balanced Active Mixer s Shutdown Function s 16-Lead (4mm × 4mm) QFN Pac kage U APPLICATIO S s Cellular, W-CDMA, PHS and UMTS Infrastructure s Cable Do wnlink Infrastructure s Wireless Infras tructure s Fixed Wireless Access Equipm ent s High Linearity Mixer Applications LT5521 Very High Linearity Active Mix er DESCRIPTIO The LT®5521 is a very hi gh linearity mixer optimized for low di stortion and low LO leakage application s. The chip includes a high speed LO bu ffer with single-ended input and a doub le-balanced active mixer. The LT5521 re quires only –5dBm LO input power to a chieve excellent distortion and noise p erformance, while reducing external dri ve circuit requirements. The LO buffer is internally 50Ω matched for wideband operation. With a 250MHz input.
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