LT5557EUF-PBF LINER [Linear Technology], LT5557EUF-PBF Datasheet

no-image

LT5557EUF-PBF

Manufacturer Part Number
LT5557EUF-PBF
Description
400MHz to 3.8GHz 3.3V High Signal Level Downconverting Mixer
Manufacturer
LINER [Linear Technology]
Datasheet
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
High Signal Level Downmixer for Multi-Carrier Wireless Infrastructure
INPUT
3.3V Operation for Reduced Power
50
Wide RF Frequency Range: 400MHz to 3.8GHz*
High Input IP3:
Conversion Gain: 3.3dB at 900MHz
–3dBm LO Drive Level
Low LO Leakage
Low Noise Figure: 10.6dB at 900MHz
Very Few External Components
16-Lead (4mm × 4mm) QFN Package
Cellular, CDMA, WCDMA, TD-SCDMA and UMTS
Infrastructure
WiMAX
Wireless Infrastructure Receiver
Wireless Infrastructure PA Linearization
900MHz/2.4GHz/3.5GHz WLAN
RF
Ω
Single-Ended RF and LO Ports
RF
LT5557
GND
–3dBm (TYP)
LO INPUT
EN
BIAS
U
V
25.6dBm at 900MHz
24.7dBm at 1950MHz
23.7dBm at 2.6GHz
2.9dB at 1950MHz
CC2
11.7dB at 1950MHz
V
1nF
CC1
IF
IF
U
+
150nH
100nH
100nH
1μF
4.7pF
4.7pF
5557 TA01a
3.3V
1nF
IF
OUTPUT
240MHz
DESCRIPTIO
The LT
wide dynamic range downconverter applications. The IC
includes a high speed differential LO buffer amplifier
driving a double-balanced mixer. Broadband, integrated
transformers on the RF and LO inputs provide single-
ended 50Ω interfaces. The differential IF output allows
convenient interfacing to differential IF filters and amplifi-
ers, or is easily matched to drive a single-ended 50Ω load,
with or without an external transformer.
The RF input is internally matched to 50Ω from 1.6GHz to
2.3GHz, and the LO input is internally matched to 50Ω
from 1GHz to 5GHz. The frequency range of both ports is
easily extended with simple external matching. The IF
output is partially matched and usable for IF frequencies
up to 600MHz.
The LT5557’s high level of integration minimizes the total
solution cost, board space and system-level variation.
*Operation over a wider frequency range is possible with reduced performance. Consult factory for
information and assistance.
All other trademarks are the property of their respective owners.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
®
5557 active mixer is optimized for high linearity,
Downconverting Mixer
3.3V High Signal Level
26
24
22
20
18
16
14
12
10
8
6
4
2
Conversion Gain, IIP3, SSB NF and
1700
LO Leakage vs RF Frequency
SSB NF
1800
IIP3
G
400MHz to 3.8GHz
C
U
RF FREQUENCY (MHz)
1900
2000
LOW-SIDE LO
IF = 240MHz
P
T A = 25°C
V
LO
CC
= –3dBm
= 3.3V
LO-RF
LO-IF
2100
5557 TA01b
2200
0
10
20
30
40
50
60
LT5557
5557fa
1

Related parts for LT5557EUF-PBF

LT5557EUF-PBF Summary of contents

Page 1

FEATURES ■ 3.3V Operation for Reduced Power Ω ■ 50 Single-Ended RF and LO Ports ■ Wide RF Frequency Range: 400MHz to 3.8GHz* ■ High Input IP3: 25.6dBm at 900MHz 24.7dBm at 1950MHz 23.7dBm at 2.6GHz ■ Conversion Gain: 3.3dB ...

Page 2

... Z = 50Ω, 1600MHz to 2300MHz (No External Matching 50Ω, 1000MHz to 5000MHz (No External Matching) O Differential at 240MHz 1200MHz to 4200MHz 380MHz to 1200MHz U W TOP VIEW ORDER PART NUMBER GND LT5557EUF#PBF + – GND PART MARKING UF PACKAGE 5557 = 125°C, θ ...

Page 3

AC ELECTRICAL CHARACTERISTICS = – 6dBm (–6dBm/tone for 2-tone IIP3 tests, Δf = 1MHz output measured at 240MHz, unless otherwise noted. Test circuit shown in Figure 1. (Notes PARAMETER Conversion Gain Conversion Gain ...

Page 4

LT5557 W U TYPICAL PERFOR A CE CHARACTERISTICS Midband (No external RF/LO matching) 240MHz IF output, P unless otherwise noted. Conversion Gain, IIP3 and Frequency 26 24 IIP3 22 20 LOW-SIDE LO 18 HIGH-SIDE ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Midband (No external RF/LO matching) 240MHz IF output, P unless otherwise noted. IF Output Power, IM3 and IM5 vs RF Input Power (2 Input Tones OUT –10 –20 –30 T ...

Page 6

LT5557 W U TYPICAL PERFOR A CE CHARACTERISTICS 900MHz application (with external RF/LO matching), 140MHz IF output, P low-side LO at 0dBm, unless otherwise noted. Conversion Gain, IIP3 and Frequency 28 26 IIP3 24 22 LOW-SIDE LO ...

Page 7

CTIO S NC (Pins 13, 14, 16): Not Connected Internally. These pins should be grounded on the circuit board for the best LO-to-RF and LO-to-IF isolation. RF (Pin 3): Single-Ended Input ...

Page 8

LT5557 TEST CIRCUITS EXTERNAL MATCHING FOR LO BELOW 1GHz LOW-PASS MATCH FOR 450MHz, 900MHz AND 3.6GHz RF *HIGH-PASS MATCH FOR 2.6GHz RF APPLICATION RF MATCH 450MHz High Side 70MHz 6.5mm 900MHz Low Side 140MHz 1.7mm 2.6GHz ...

Page 9

U U APPLICATIO S I FOR ATIO Introduction The LT5557 consists of a high linearity double-balanced mixer, RF buffer amplifier, high speed limiting LO buffer amplifier and bias/enable circuits. The RF and LO inputs are both single ended. The IF ...

Page 10

LT5557 U U APPLICATIO S I FOR ATIO series transmission line/shunt capacitor matching topol- ogy allows the LT5557 to be used for multiple frequency standards without circuit board layout modifications. The series transmission line can also be replaced with a ...

Page 11

U U APPLICATIO S I FOR ATIO The optimum LO drive is –3dBm for LO frequencies above 1.2GHz, although the amplifiers are designed to accom- modate several input power variation without significant mixer performance variation. Below 1.2GHz, ...

Page 12

LT5557 U U APPLICATIO S I FOR ATIO Transformer-Based Bandpass IF Matching The standard evaluation board (shown in Figure 1) uses an L-C bandpass IF matching network, with an 8:1 transformer connected across the IF pins. The L-C network maximizes ...

Page 13

U U APPLICATIO S I FOR ATIO These equations give a good starting point, but it is usually necessary to adjust the component values after building and testing the circuit. The final solution can be achieved with less iteration by ...

Page 14

LT5557 U U APPLICATIO S I FOR ATIO Differential IF Output Matching For fully differential IF architectures, the mixer’s IF out- puts can be matched directly into a SAW filter or IF amplifier, thus eliminating the IF transformer. One ex- ...

Page 15

PACKAGE DESCRIPTIO 4.35 ± 0.05 2.15 ± 0.05 2.90 ± 0.05 (4 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 4.00 ± 0.10 (4 SIDES) PIN 1 TOP MARK (NOTE 6) NOTE: 1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION ...

Page 16

LT5557 RELATED PARTS PART NUMBER DESCRIPTION Infrastructure LT5511 High Linearity Upconverting Mixer LT5512 1KHz-3GHz High Signal Level Active Mixer LT5514 Ultralow Distortion, IF Amplifier/ADC Driver with Digitally Controlled Gain LT5515 1.5GHz to 2.5GHz Direct Conversion Quadrature Demodulator LT5516 0.8GHz to ...

Related keywords