LT5528 Datasheet PDF - Linear Technology

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LT5528
Linear Technology

Part Number LT5528
Description 1.5GHz to 2.4GHz High Linearity Direct Quadrature Modulator
Page 16 Pages


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FEATURES
Direct Conversion to 1.5GHz to 2.4GHz
High OIP3: 21.8dBm at 2GHz
Low Output Noise Floor at 5MHz Offset:
No RF: –159.3dBm/Hz
POUT = 4dBm: –151.8dBm/Hz
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
U
APPLICATIO S
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
LT5528www.DataSheet4U.com
1.5GHz to 2.4GHz
High Linearity Direct
Quadrature Modulator
DESCRIPTIO
The LT®5528 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 configured
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
1.5GHz to 2.4GHz Direct Conversion Transmitter Application
with LO Feed-Through and Image Calibration Loop
I-DAC
14
16 V-I
VCC 8, 13
LT5528
5V
RF = 1.5GHz
TO 2.4GHz
W-CDMA ACPR, AltCPR and Noise vs RF Output
Power at 2140MHz for 1, 2 and 4 Channels
–55 –140
DOWNLINK TEST MODEL 64 DPCH
–60 –145
EN
Q-DAC
I-CHANNEL
1 0°
90°
7 Q-CHANNEL
5 V-I
11
PA
4-CH ACPR
–65 2-CH ACPR –150
BALUN
LO FEED-THROUGH CAL OUT
2-CH AltCPR
4-CH AltCPR
IMAGE CAL OUT
–70
1-CH ACPR
–155
1-CH AltCPR
CAL
BASEBAND
DSP
ADC
2, 4, 6, 9, 10, 12, 15, 17
3
VCO/SYNTHESIZER
–75 4-CH NOISE
–160
1-CH NOISE
–80 –165
–42 –38 –34 –30 –26 –22 –18 –14
RF OUTPUT POWER PER CARRIER (dBm)
5528 TA01a
5528 TA01b
5528f
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LT5528
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
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UW U
PACKAGE/ORDER I FOR ATIO
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 IS GROUND (PIN 17)
MUST BE SOLDERED TO PCB.
ORDER PART
NUMBER
LT5528EUF
UF PART
MARKING
5528A
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS VCC = 5V, EN = High, TA = 25°C, fLO = 2GHz, fRF = 2.002GHz, PLO = 0dBm.
BBPI, BBMI, BBPQ, BBMQ inputs 0.525VDC, Baseband Input Frequency = 2MHz, I&Q 90° shifted (upper sideband 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
1.5 to 2.4
1.7 to 2.2
GHz
GHz
S22, ON
S22, OFF
NFloor
GP
GV
POUT
G3LO vs LO
OP1dB
RF Output Return Loss
RF Output Return Loss
RF Output Noise Floor
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)
– 15
– 12
– 159.3
– 151.8
– 151.8
– 6.5
–6
– 2.1
– 28
7.9
dB
dB
dBm/Hz
dBm/Hz
dBm/Hz
dB
dB
dBm
dB
dBm
OIP2
Output 2nd Order Intercept
(Notes 13, 14)
49 dBm
OIP3 Output 3rd Order Intercept (Notes 13, 15)
21.8 dBm
IR Image Rejection
(Note 16)
–45 dBc
LOFT
LO Input (LO)
Carrier Leakage
(LO Feed-Through)
EN = High, PLO = 0dBm (Note 16)
EN = Low, PLO = 0dBm (Note 16)
– 42
– 57.8
dBm
dBm
fLO
PLO
S11, ON
S11, OFF
NFLO
GLO
IIP3LO
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
LO Input 3rd Order Intercept
EN = High (Note 6)
EN = Low (Note 6)
(Note 5) at 2GHz
(Note 5) at 2GHz
(Note 5) at 2GHz
1.5 to 2.4
–10 0
– 17
– 5.5
14.4
20.4
– 10
5
GHz
dBm
dB
dB
dB
dB
dBm
5528f
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LT5528www.DataSheet4U.com
ELECTRICAL CHARACTERISTICS VCC = 5V, EN = High, TA = 25°C, fLO = 2GHz, fRF = 2.002GHz, PLO = 0dBm.
BBPI, BBMI, BBPQ, BBMQ inputs 0.525VDC, Baseband Input Frequency = 2MHz, I&Q 90° shifted (upper sideband selection).
PRF, OUT = –10dBm, unless otherwise noted. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Baseband Inputs (BBPI, BBMI, BBPQ, BBMQ)
BWBB
VCMBB
RIN, SE
PLO2BB
IP1dB
Baseband Bandwidth
DC Common Mode Voltage
Single-Ended Input Resistance
Carrier Feed-Through on BB
Input 1dB Compression Point
ΔGI/Q
I/Q Absolute Gain Imbalance
ΔϕI/Q
I/Q Absolute Phase Imbalance
Power Supply (VCC)
VCC Supply Voltage
ICC, ON
Supply Current
ICC, OFF
Supply Current, Sleep Mode
tON Turn-On Time
tOFF Turn-Off Time
Enable (EN), Low = Off, High = On
–3dB Bandwidth
(Note 4)
(Note 4)
POUT = 0 (Note 4)
Differential Peak-to-Peak (Note 7)
EN = High
EN = 0V
EN = Low to High (Note 11)
EN = High to Low (Note 12)
400
0.525
45
– 40
3.2
0.05
0.5
MHz
V
Ω
dBm
VP-P, DIFF
dB
Deg
4.5 5 5.25
125 145
0.05 50
0.25
1.3
V
mA
µA
µs
µs
Enable
Input High Voltage
Input High Current
EN = High
EN = 5V
1.0
240
V
µA
Sleep
Input Low Voltage
EN = Low
0.5 V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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 –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 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 feed-through 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.
5528f
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LT5528
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TYPICAL PERFOR A CE CHARACTERISTICS VCC = 5V, EN = High, TA = 25°C, fLO = 2.14GHz, PLO
= 0dBm. BBPI, BBMI, BBPQ, BBMQ inputs 0.525VDC, Baseband Input Frequency fBB = 2MHz, I&Q 90° shifted. fRF = fBB + fLO (upper
sideband selection). PRF, OUT = –10dBm (–10dBm/tone for 2-tone measurements), unless otherwise noted. (Note 3)
Supply Current vs Supply Voltage
140
85°C
130
25°C
Gain and Output 1dB Compression
vs LO Frequency and Temperature
10
5
OP1dB
0
Gain and Output 1dB
Compression vs LO Frequency
and Supply Voltage
10
5
OP1dB
0
120 –5
–5
110
100
4.5
–40°C
5.0
SUPPLY VOLTAGE (V)
5.5
5528 G01
–10
GAIN
–15
–20
1.3
–40°C
25°C
85°C
1.5 1.7 1.9 2.1 2.3
LO FREQUENCY (GHz)
2.5 2.7
5528 G02
–10
–15
–20
1.3
GAIN
4.5V
5V
5.5V
1.5 1.7 1.9 2.1 2.3
LO FREQUENCY (GHz)
2.5 2.7
5528 G03
Output IP3 and Noise Floor vs
LO Frequency and Temperature
26 –142
–40°C
24 25°C –144
85°C
22 –146
20 OIP3
18
fBB, 1 = 2MHz
fBB, 2 = 2.1MHz
16
–148
–150
–152
14
NOISE FLOOR
12 NO BASEBAND SIGNAL
10 20MHz OFFSET NOISE
–154
–156
–158
8 –160
6 –162
1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7
LO FREQUENCY (GHz)
5528 G04
Output IP3 and Noise Floor vs
LO Frequency and Supply Voltage
26 –142
4.5V
24 5V –144
5.5V
22 –146
20 OIP3
fBB, 1 = 2MHz
18 fBB, 2 = 2.1MHz
–148
–150
16 –152
14
12
NOISE FLOOR
NO BASEBAND SIGNAL
10 20MHz OFFSET NOISE
–154
–156
–158
8 –160
6 –162
1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7
LO FREQUENCY (GHz)
5528 G05
Output IP2 vs LO Frequency
65
60
55
50
45
4.5V, 25°C
5V, –40°C
40 5V, 25°C
5V, 85°C
5.5V, 25°C
35
1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7
LO FREQUENCY (GHz)
fIM2 = fBB,1 + fBB,2 + fLO
fBB, 1 = 2MHz
fBB, 2 = 2.1MHz
5528 G06
5528f
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