lt5528euf-trpbf Linear Technology Corporation, lt5528euf-trpbf Datasheet

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lt5528euf-trpbf

Manufacturer Part Number
lt5528euf-trpbf
Description
1.5ghz To 2.4ghz High Linearity Direct Quadrature Modulator
Manufacturer
Linear Technology Corporation
Datasheet
APPLICATIO S
FEATURES
TYPICAL APPLICATIO
Direct Conversion to 1.5GHz to 2.4GHz
High OIP3: 21.8dBm at 2GHz
Low Output Noise Floor at 5MHz Offset:
4-Ch W-CDMA ACPR: –66dBc at 2.14GHz
Integrated LO Buffer and LO Quadrature Phase
Generator
50Ω AC-Coupled Single-Ended LO and RF Ports
50Ω DC Interface to Baseband Inputs
Low Carrier Leakage: –42dBm at 2GHz
High Image Rejection: 45dB at 2GHz
16-Lead QFN 4mm × 4mm Package
Infrastructure Tx for DCS, PCS and UMTS Bands
Image Reject Up-Converters for PCS and UMTS
Bands
Low-Noise Variable Phase-Shifter for 1.5GHz to
2.4GHz Local Oscillator Signals
ADC
BASEBAND
No RF: –159.3dBm/Hz
P
DSP
OUT
Q-DAC
I-DAC
= 4dBm: –151.8dBm/Hz
1.5GHz to 2.4GHz Direct Conversion Transmitter Application
EN
with LO Feed-Through and Image Calibration Loop
2, 4, 6, 9, 10, 12, 15, 17
U
14
16
1
7
5
Q-CHANNEL
V-I
V-I
I-CHANNEL
90°
VCO/SYNTHESIZER
U
V
CC
8, 13
3
BALUN
LT5528
11
CAL
LO FEED-THROUGH CAL OUT
IMAGE CAL OUT
5V
PA
DESCRIPTIO
The LT
performance wireless applications, including wireless
infrastructure. It allows direct modulation of an RF signal
using differential baseband I and Q signals. It supports
PHS, GSM, EDGE, TD-SCDMA, CDMA, CDMA2000,
W-CDMA and other systems. It may also be confi gured
as an image reject up-converting mixer, by applying
90° phase-shifted signals to the I and Q inputs. The I/Q
baseband inputs consist of voltage-to-current converters
that in turn drive double-balanced mixers. The outputs of
these mixers are summed and applied to an on-chip RF
transformer, which converts the differential mixer signals
to a 50Ω single-ended output. The four balanced I and Q
baseband input ports are intended for DC coupling from a
source with a common-mode voltage level of about 0.5V.
The LO path consists of an LO buffer with single-ended
input, and precision quadrature generators that produce
the LO drive for the mixers. The supply voltage range is
4.5V to 5.25V.
RF = 1.5GHz
TO 2.4GHz
, LTC and LT are registered trademarks of Linear Technology Corporation.
5528 TA01a
®
Quadrature Modulator
5528 is a direct I/Q modulator designed for high
High Linearity Direct
W-CDMA ACPR, AltCPR and Noise vs RF Output
Power at 2140MHz for 1, 2 and 4 Channels
–55
–60
–65
–70
–75
–80
1.5GHz to 2.4GHz
U
–42
4-CH NOISE
RF OUTPUT POWER PER CARRIER (dBm)
–38
2-CH AltCPR
1-CH AltCPR
DOWNLINK TEST MODEL 64 DPCH
–34
–30
4-CH ACPR
1-CH NOISE
–26
4-CH AltCPR
1-CH ACPR
–22
2-CH ACPR
LT5528
–18
5528 TA01b
–14
–140
–145
–150
–155
–160
–165
1
5528f

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lt5528euf-trpbf Summary of contents

Page 1

... The LO path consists buffer with single-ended input, and precision quadrature generators that produce the LO drive for the mixers. The supply voltage range is 4.5V to 5.25V. , LTC and LT are registered trademarks of Linear Technology Corporation LT5528 ...

Page 2

... EN = High 0dBm (Note 16 Low 0dBm (Note 16 High (Note Low (Note 6) (Note 5) at 2GHz (Note 5) at 2GHz (Note 5) at 2GHz U W TOP VIEW ORDER PART NUMBER LT5528EUF 12 GND GND 10 GND 9 UF PART MARKING UF PACKAGE 5528A = 125° ...

Page 3

ELECTRICAL CHARACTERISTICS BBPI, BBMI, BBPQ, BBMQ inputs 0.525V P = –10dBm, unless otherwise noted. (Note 3) RF, OUT SYMBOL PARAMETER Baseband Inputs (BBPI, BBMI, BBPQ, BBMQ) BW Baseband Bandwidth Common Mode Voltage CMBB R Single-Ended Input Resistance ...

Page 4

LT5528 W U TYPICAL PERFOR A CE CHARACTERISTICS = 0dBm. BBPI, BBMI, BBPQ, BBMQ inputs 0.525V sideband selection –10dBm (–10dBm/tone for 2-tone measurements), unless otherwise noted. (Note 3) RF, OUT Supply Current vs Supply Voltage 140 85°C 130 ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS = 0dBm. BBPI, BBMI, BBPQ, BBMQ inputs 0.525V sideband selection –10dBm (–10dBm/tone for 2-tone measurements), unless otherwise noted. (Note 3) RF, OUT 2 • LO Leakage to RF Output vs 2 ...

Page 6

LT5528 W U TYPICAL PERFOR A CE CHARACTERISTICS = 0dBm. BBPI, BBMI, BBPQ, BBMQ inputs 0.525V sideband selection –10dBm (–10dBm/tone for 2-tone measurements), unless otherwise noted. (Note 3) RF, OUT Gain vs LO Power –4 –6 –8 –10 ...

Page 7

W U TYPICAL PERFOR A CE CHARACTERISTICS = 0dBm. BBPI, BBMI, BBPQ, BBMQ inputs 0.525V sideband selection –10dBm (–10dBm/tone for 2-tone measurements), unless otherwise noted. (Note 3) RF, OUT LO Feed-Through and Image Rejection at 2140MHz vs Baseband ...

Page 8

LT5528 W BLOCK DIAGRA U U APPLICATIO S I FOR ATIO The LT5528 consists of I and Q input differential voltage- to-current converters, I and Q up-conversion mixers output balun quadrature phase generator and LO buffers. ...

Page 9

U U APPLICATIO S I FOR ATIO and 12pF to ground is incorporated (see Figure 1), which limits the baseband bandwidth to approximately 330MHz (–1dB point). The common-mode voltage is about 0.52V and is approximately constant over temperature ...

Page 10

LT5528 U U APPLICATIO S I FOR ATIO LO Section The internal LO input amplifi er performs single-ended to differential conversion of the LO input signal. Figure 4 shows the equivalent circuit schematic of the LO input 20pF ...

Page 11

U U APPLICATIO S I FOR ATIO The RF output S with no LO power applied is given in 22 Table 4. Table 4. RF Port Output Impedance vs Frequency for EN = High and No LO Power Applied Frequency ...

Page 12

LT5528 U U APPLICATIO S I FOR ATIO Additionally, the exposed pad provides heat sinking for the part and minimizes the possibility of the chip overheating. If improved LO and Image suppression are required feed-through calibration and an ...

Page 13

U U APPLICATIO S I FOR ATIO Application Measurements The LT5528 is recommended for base-station applications using various modulation formats. Figure 12 shows a typi- cal application. The CAL box in Figure 12 allows for LO feed-through and Image suppression ...

Page 14

LT5528 U U APPLICATIO S I FOR ATIO internal circuit of the LT5528 is drawn. For best results, a high ohmic source is recommended; for example, the interface circuit drawn in Figure 3, modifi pulling resistors R5 and ...

Page 15

... SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights Package 16-Lead Plastic QFN (4mm × ...

Page 16

... Supply, 40MHz to 500MHz IF, –4dB to 57dB Linear Power Gain, 8.8MHz Baseband Bandwidth 17MHz Baseband Bandwidth, 40MHz to 500MHz IF, 1.8V to 5.25V Supply, –7dB to 56dB Linear Power Gain 500MHz BW S/H, 71.8dB SNR 500MHz BW S/H, 75.5dB SNR ● www.linear.com = 28mA, S 5528f LT/TP 1104 1K • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2004 ...

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