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LT5518EUF#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LT5518
1
5518f
■
High Input Impedance Version of the LT5528
■
Direct Conversion to 1.5GHz – 2.4GHz
■
High OIP3: 22.8dBm at 2GHz
■
Low Output Noise Floor at 20MHz Offset:
No RF: –158.2dBm/Hz
P
OUT
= 4dBm: –152.5dBm/Hz
■
4-Ch W-CDMA ACPR: –64dBc at 2.14GHz
■
Integrated LO Buffer and LO Quadrature Phase
Generator
■
50Ω AC-Coupled Single-Ended LO and RF Ports
■
Low Carrier Leakage: –49dBm at 2GHz
■
High Image Rejection: 40dB at 2GHz
■
16-Lead QFN 4mm × 4mm Package
■
Infrastructure Tx for DCS, PCS and UMTS Bands
■
Image Reject Up-Converters for DCS, PCS and UMTS
Bands
■
Low Noise Variable Phase-Shifter for 1.5GHz to
2.4GHz Local Oscillator Signals
1.5GHz–2.4GHz
High Linearity Direct
Quadrature Modulator
The LT
®
5518 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 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 high impedance 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 balanced I and Q
baseband input ports are intended for DC coupling from a
source with a common mode voltage level of about 2.1V.
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.
1.5GHz to 2.4GHz Direct Conversion Transmitter Application
with LO Feedthrough and Image Calibration Loop
RF OUTPUT POWER PER CARRIER (dBm)
–34 –30 –26 –22 –18 –14 –10
ACPR, ALTCPR (dBc)
NOISE FLOOR AT 30MHz OFFSET (dBm/Hz)
–65
–60
–55
5518 TA01b
–70
–75
–85
–80
–145
–140
–135
–150
–155
–165
–160
4-CH ACPR
4-CH NOISE
1-CH NOISE
4-CH ALTCPR
1-CH ALTCPR
1-CH ACPR
DOWNLINK TEST MODEL 64 DPCH
90°
0°
LT5518
BASEBAND
GENERATOR
CAL
LO FEEDTHROUGH
CAL OUT
IMAGE CAL OUT
PA
VCO/SYNTHESIZER
RF = 1.5GHz
TO 2.4GHz
EN
2, 4, 6, 9, 10, 12, 15, 17
100nF
×2
5V
V-I
V-I
I-CHANNEL
Q-CHANNEL
BALUN
14
16
1
7
5
8, 13
V
CC
11
3
5518 TA01a
I-DAC
Q-DAC
ADC
W-CDMA ACPR, AltCPR and Noise vs RF Output
Power at 2140MHz for 1 and 4 Channels
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LT5518
2
5518f
16
17
15 14 13
5 6 7 8
TOP VIEW
EXPOSED PAD (PIN 17) IS GND
MUST BE SOLDERED TO THE PCB
9
10
11
12
4
3
2
1EN
GND
LO
GND
GND
RF
GND
GND
BBMI
GND
BBPI
V
CC
BBMQ
GND
BBPQ
V
CC
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 V
CC
+ 500mV
ORDER PART
NUMBER
UF PART
MARKING
T
JMAX
= 125°C, θ
JA
= 37°C/W
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
5518
LT5518EUF
(Note 1)
V
CC
= 5V, EN = High, T
A
= 25°C, f
LO
= 2GHz, f
RF
= 2.002GHz, P
LO
= 0dBm.
BBPI, BBMI, BBPQ, BBMQ inputs 2.06V
DC
, Baseband Input Frequency = 2MHz, I and Q 90° shifted (upper sideband selection).
P
RF, OUT
= –10dBm, unless otherwise noted. (Note 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
RF Output (RF)
f
RF
RF Frequency Range –3dB Bandwidth 1.5 to 2.4 GHz
RF Frequency Range –1dB Bandwidth 1.7 to 2.2 GHz
S
22, ON
RF Output Return Loss EN = High (Note 6) –14 dB
S
22, OFF
RF Output Return Loss EN = Low (Note 6) –12 dB
NFloor RF Output Noise Floor No Input Signal (Note 8) –158.2 dBm/Hz
P
OUT
= 4dBm (Note 9) –152.5 dBm/Hz
P
OUT
= 4dBm (Note 10) –151.1 dBm/Hz
G
P
Conversion Power Gain P
OUT
/P
IN
, I&Q 10.6 dB
G
V
Conversion Voltage Gain 20 • log(V
OUT, 50Ω
/V
IN, DIFF, I or Q
) –4 dB
P
OUT
Absolute Output Power 1V
P-P, DIFF
CW Signal, I and Q 0 dBm
G
3LO vs LO
3 • LO Conversion Gain Difference (Note 17) –28 dB
OP1dB Output 1dB Compression (Note 7) 8.5 dBm
OIP2 Output 2nd Order Intercept (Notes 13, 14) 49 dBm
OIP3 Output 3rd Order Intercept (Notes 13, 15) 22.8 dBm
IR Image Rejection (Note 16) –40 dBc
LOFT Carrier Leakage EN = High, P
LO
= 0dBm (Note 16) –49 dBm
(LO Feedthrough) EN = Low, P
LO
= 0dBm (Note 16) –58 dBm
LO Input (LO)
f
LO
LO Frequency Range 1.5 to 2.4 GHz
P
LO
LO Input Power –10 0 5 dBm
S
11, ON
LO Input Return Loss EN = High (Note 6) –18 dB
S
11, OFF
LO Input Return Loss EN = Low (Note 6) –5 dB
NF
LO
LO Input Referred Noise Figure (Note 5) at 2GHz 14 dB
G
LO
LO to RF Small Signal Gain (Note 5) at 2GHz 23.8 dB
IIP3
LO
LO Input Linearity (Note 5) at 2GHz –9 dBm
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
LT5518
3
5518f
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Specifi cations 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 confi guration of Figure 8.
Note 4: On each of the four baseband inputs BBPI, BBMI, BBPQ and
BBMQ.
Note 5: V(BBPI) – V(BBMI) = 1V
DC
, V(BBPQ) – V(BBMQ) = 1V
DC
.
Note 6: Maximum value within –1dB bandwidth.
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 fi nal 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 output 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 = 2GHz.
Note 18: Common mode current range where the common mode (CM)
feedback loop biases the part properly. The common mode current is the
sum of the current fl owing into the BBPI (or BBPQ) pin and the current
fl owing into the BBMI (or BBMQ) pin.
V
CC
= 5V, EN = High, T
A
= 25°C, f
LO
= 2GHz, f
RF
= 2.002GHz, P
LO
= 0dBm.
BBPI, BBMI, BBPQ, BBMQ inputs 2.06V
DC
, Baseband Input Frequency = 2MHz, I and Q 90° shifted (upper sideband selection).
P
RF, OUT
= –10dBm, unless otherwise noted. (Note 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Baseband Inputs (BBPI, BBMI, BBPQ, BBMQ)
BW
BB
Baseband Bandwidth –3dB Bandwidth 400 MHz
V
CMBB
DC Common Mode Voltage (Note 4) 2.06 V
R
IN, DIFF
Differential Input Resistance Between BBPI and BBMI (or BBPQ and BBMQ) 2.9 kΩ
R
IN, CM
Common Mode Input Resistance BBPX and BBMX Shorted Together 105 Ω
I
CM, COMP
Common Mode Compliance Current Range BBPX and BBMX Shorted Together (Note 18) –730 to 480 µA
P
LO2BB
Carrier Feedthrough on BB P
OUT
= 0 (Note 4) –40 dBm
IP1dB Input 1dB Compression Point Differential Peak-to-Peak (Note 7) 2.7 V
P-P, DIFF
ΔG
I/Q
I/Q Absolute Gain Imbalance 0.06 dB
Δφ
I/Q
I/Q Absolute Phase Imbalance 1 deg
Power Supply (V
CC
)
V
CC
Supply Voltage 4.5 5 5.25 V
I
CC, ON
Supply Current EN = High 128 145 mA
I
CC, OFF
Supply Current, Sleep Mode EN = 0V 0.05 50 µA
t
ON
Turn-On Time EN = Low to High (Note 11) 0.2 µs
t
OFF
Turn-Off Time EN = High to Low (Note 12) 1.3 µs
Enable (EN), Low = Off, High = On
Enable Input High Voltage EN = High 1.0 V
Input High Current EN = 5V 240 µA
Sleep Input Low Voltage EN = Low 0.5 V
ELECTRICAL CHARACTERISTICS
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT5518EUF#PBF

Mfr. #:
Buy LT5518EUF#PBF
Manufacturer:
Analog Devices Inc.
Description:
Modulator / Demodulator 2GHz Direct Quadrature Modulator
Lifecycle:
New from this manufacturer.
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