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Quadrature Modulator. LT5568-2 Datasheet

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Quadrature Modulator. LT5568-2 Datasheet






LT5568-2 Modulator. Datasheet pdf. Equivalent




LT5568-2 Modulator. Datasheet pdf. Equivalent





Part

LT5568-2

Description

High Linearity Direct Quadrature Modulator

Manufacture

Linear Technology

Datasheet
Download LT5568-2 Datasheet


Linear Technology LT5568-2

LT5568-2; .


Linear Technology LT5568-2

.


Linear Technology LT5568-2

.



Part

LT5568-2

Description

High Linearity Direct Quadrature Modulator

Manufacture

Linear Technology

Datasheet
Download LT5568-2 Datasheet




 LT5568-2
FEATURES
Optimized Image Rejection for 850MHz to 965MHz
High OIP3: +22.9dBm at 900MHz
Low Output Noise Floor at 5MHz Offset:
No RF: –159.4dBm/Hz
POUT = 4dBm: –153dBm/Hz
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: –43dBm at 900MHz
High Image Rejection: –52dBc at 900MHz
16-Lead 4mm × 4mm QFN Package
U
APPLICATIO S
Infrastructure Tx for GSM/Cellular Bands
Image Reject Up-Converters for Cellular Bands
Low-Noise Variable Phase-Shifter for 700MHz to
1050MHz Local Oscillator Signals
RFID Reader
LT5568-2www.DataSheet4U.com
GSM/EDGE Optimized,
High Linearity Direct
Quadrature Modulator
DESCRIPTIO
The LT®5568-2 is a direct I/Q modulator designed for high
performance wireless applications, including wireless
infrastructure. It allows direct modulation of an RF signal
using differential baseband I and Q signals. It supports
GSM, EDGE, CDMA, CDMA2000 and other systems that
operate in the 850MHz to 965MHz band. It may be config-
ured as an image reject upconverting 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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
850MHz to 965MHz Direct Conversion Transmitter Application
I-DAC
EN
Q-DAC
VCC
V-I
I-CHANNEL
0°
90°
Q-CHANNEL
V-I
LT5568-2
BALUN
5V
100nF
x 2 RF = 850MHz
TO 965MHz
PA
BASEBAND
GENERATOR
VCO/SYNTHESIZER
55682 TA01
GSM EVM and Noise
vs RF Output Power at 900MHz
5 –96
4 –98
3
NOISE
–100
2 –102
EVM
1 –104
0
–10
–106
–8 –6 –4 –2 0 2 4 6
GSM RF OUTPUT POWER (dBm)
55682 TA02
55682f
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 LT5568-2
LT5568-2
www.DataSheet4U.com
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage.........................................................5.5V
Common Mode Level of BBPI, BBMI and
BBPQ, BBMQ .......................................................2.5V
Operating Ambient Temperature
(Note 2) ............................................... –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
Voltage on Any Pin
Not to Exceed...................... –500mV to VCC + 500mV
CAUTION: This part is sensitive to ESD. It is very
important that proper ESD precautions be observed
when handling the LT5568-2.
PIN CONFIGURATION
TOP VIEW
16 15 14 13
EN 1
12 GND
GND 2
11 RF
17
LO 3
10 GND
GND 4
9 GND
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 INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT5568-2EUF#PBF
LT5568-2EUF#TRPBF 55682
16-Lead (4mm × 4mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
ELECTRICAL CHARACTERISTICS VCC = 5V, EN = High, TA = 25°C, fLO = 900MHz, fRF = 902MHz, PLO = 0dBm.
BBPI, BBMI, BBPQ, BBMQ inputs 0.54VDC, Baseband Input Frequency = 2MHz, I&Q 90° shifted (upper side-band selection).
PRF, OUT = –10dBm, unless otherwise noted. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
RF Output (RF)
fRF RF Frequency Range
RF Frequency Range
–3dB Bandwidth
–1dB Bandwidth
0.6 to 1.1
0.7 to 1
GHz
GHz
S22, ON
S22, OFF
NFloor
RF Output Return Loss
RF Output Return Loss
RF Output Noise Floor
GP
GV
POUT
G3LO vs LO
OP1dB
Conversion Power Gain
Conversion Voltage Gain
Absolute Output Power
3 • LO Conversion Gain Difference
Output 1dB Compression
EN = High (Note 6)
EN = Low (Note 6)
No Input Signal (Note 8)
POUT = 4dBm (Note 9)
POUT = 4dBm (Note 10)
POUT/PIN, I&Q
20 • Log (VOUT, 50Ω/VIN, DIFF, I or Q)
1VP-P DIFF CW Signal, I and Q
(Note 17)
(Note 7)
– 16
– 18
– 159.4
– 153
– 152.6
–9 –6.8 –3
– 6.8
– 2.8
– 23
8.6
dB
dB
dBm/Hz
dBm/Hz
dBm/Hz
dB
dB
dBm
dB
dBm
OIP2 Output 2nd Order Intercept
(Notes 13, 14)
59 dBm
OIP3 Output 3rd Order Intercept
(Notes 13, 15)
22.9 dBm
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 LT5568-2
LT5568-2www.DataSheet4U.com
ELECTRICAL CHARACTERISTICS VCC = 5V, EN = High, TA = 25°C, fLO = 900MHz, fRF = 902MHz, PLO = 0dBm.
BBPI, BBMI, BBPQ, BBMQ inputs 0.54VDC, Baseband Input Frequency = 2MHz, I&Q 90° shifted (upper side-band selection).
PRF, OUT = –10dBm, unless otherwise noted. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
IR
LOFT
LO Input (LO)
Image Rejection
Carrier Leakage
(LO Feedthrough)
fBB = 100kHz (Note 16)
EN = High, PLO = 0dBm (Note 16)
EN = Low, PLO = 0dBm (Note 16)
–52 dBc
–43 dBm
–65 dBm
fLO
PLO
S11, ON
S11, OFF
NFLO
GLO
LO Frequency Range
LO Input Power
LO Input Return Loss
LO Input Return Loss
LO Input Referred Noise Figure
LO to RF Small Signal Gain
EN = High (Note 6)
EN = Low (Note 6)
(Note 5) at 900MHz
(Note 5) at 900MHz
0.6 to 1.1
–10 0
– 15
– 2.5
14.7
14.7
5
GHz
dBm
dB
dB
dB
dB
IIP3LO
LO Input 3rd Order Intercept
Baseband Inputs (BBPI, BBMI, BBPQ, BBMQ)
(Note 5) at 900MHz
–3 dBm
BWBB
VCMBB
RIN, SE
PLO2BB
IP1dB
Baseband Bandwidth
DC Common Mode Voltage
Single-Ended Input Resistance
Carrier Feedthrough on BB
Input 1dB Compression Point
Power Supply (VCC)
VCC Supply Voltage
–3dB Bandwidth
(Note 4)
(Note 4)
POUT = 0 (Note 4)
Differential Peak-to-Peak (Notes 7, 18)
380 MHz
0.54 V
47 Ω
–38 dBm
4.3 VP-P, DIFF
4.5 5 5.25
V
ICC, ON
Supply Current
ICC, OFF
Supply Current, Sleep Mode
tON Turn-On Time
tOFF Turn-Off Time
Enable (EN), Low = Off, High = On
EN = High
EN = 0V
EN = Low to High (Note 11)
EN = High to Low (Note 12)
80 110 145
100
0.3
1.4
mA
µA
µs
µs
Enable
Input High Voltage
Input High Current
EN = High
EN = 5V
1.0
245
V
µA
Sleep
Input Low Voltage
Input Low Current
EN = Low
EN = 0V
0.5
0.01
V
µA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Specifications over the –40°C to 85°C temperature range are assured
by design, characterization and correlation with statistical process controls.
Note 3: Tests are performed as shown in the configuration of Figure 7.
Note 4: On each of the four baseband inputs BBPI, BBMI, BBPQ and BBMQ.
Note 5: V(BBPI) – V(BBMI) = 1VDC, V(BBPQ) – V(BBMQ) = 1VDC.
Note 6: Maximum value within 850MHz to 965MHz.
Note 7: An external coupling capacitor is used in the RF output line.
Note 8: At 20MHz offset from the LO signal frequency.
Note 9: At 20MHz offset from the CW signal frequency.
Note 10: At 5MHz offset from the CW signal frequency.
Note 11: RF power is within 10% of final value.
Note 12: RF power is at least 30dB lower than in the ON state.
Note 13: Baseband is driven by 2MHz and 2.1MHz tones. Drive level is set
in such a way that the two resulting RF tones are –10dBm each.
Note 14: IM2 measured at LO frequency + 4.1MHz.
Note 15: IM3 measured at LO frequency + 1.9MHz and LO frequency + 2.2MHz.
Note 16: Amplitude average of the characterization data set without image
or LO feedthrough nulling (unadjusted).
Note 17: The difference in conversion gain between the spurious signal at
f = 3 • LO – BB versus the conversion gain at the desired signal at f = LO +
BB for BB = 2MHz and LO = 900MHz.
Note 18: The input voltage corresponding to the output P1dB.
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