LT5572 - 1.5GHz to 2.5GHz High Linearity Direct Quadrature Modulator

LT5572
1.5GHz to 2.5GHz
High Linearity Direct
Quadrature Modulator
DESCRIPTIO
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FEATURES
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Direct Conversion from Baseband to RF
High Output: –2.5dB Conversion Gain
High OIP3: +21.6dBm at 2GHz
Low Output Noise Floor at 20MHz Offset:
No RF: –158.6dBm/Hz
POUT = 4dBm: –152.5dBm/Hz
Low Carrier Leakage: –39.4dBm at 2GHz
High Image Rejection: –41.2dBc at 2GHz
4-Channel W-CDMA ACPR: –67.7dBc at 2.14GHz
Integrated LO Buffer and LO Quadrature Phase
Generator
50Ω AC-Coupled Single-Ended LO and RF Ports
High Impedance DC Interface to Baseband Inputs
with 0.5V Common Mode Voltage
16-Lead QFN 4mm × 4mm Package
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APPLICATIO S
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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
2.5GHz Local Oscillator Signals
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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The LT5572 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 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 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.
TYPICAL APPLICATIO
W-CDMA ACPR, AltCPR and Noise
vs RF Output Power at 2.14GHz for
1, 2 and 4 Channels
Direct Conversion Transmitter Application
V-I
I-CH
EN
BASEBAND
GENERATOR
0°
1
90°
7
Q-DAC
11
5
Q-CH
BALUN
V-I
PA
ACPR, AltCPR (dBc)
16
LT5572
DOWNLINK TEST
MODEL 64 DPCH
4-CH ACPR
4-CH AltCPR
–60
2-CH ACPR
–135
–145
2-CH AltCPR
–80
3
VCO/SYNTHESIZER
1-CH
ACPR
–70
–90
–30
1-CH AltCPR
–155
2-CH NOISE
4-CH NOISE
5572 TA01a
2, 4, 6, 9, 10, 12, 15, 17
–125
1-CH NOISE
–25
–15
–10
–5
–20
RF OUTPUT POWER PER CARRIER (dBm)
NOISE FLOOR AT 30MHz OFFSET (dBm/Hz)
VCC
14
I-DAC
–50
5V
100nF
×2
RF = 1.5GHz
TO 2.5GHz
8, 13
–165
5572 TA01b
5572f
1
LT5572
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W W
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ABSOLUTE
AXI U RATI GS
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W
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PACKAGE/ORDER I FOR ATIO
(Note 1)
Supply Voltage .........................................................5.5V
Common Mode Level of BBPI, BBMI
and BBPQ, BBMQ.....................................................0.6V
Voltage on Any Pin
Not to Exceed ........................–500mV to (VCC + 500mV)
Operating Ambient Temperature Range
(Note 2).................................................... –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
VCC
BBPI
GND
BBMI
TOP VIEW
16 15 14 13
EN 1
12 GND
GND 2
11 RF
17
LO 3
10 GND
GND 4
6
7
8
BBMQ
GND
BBPQ
VCC
9
5
GND
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 PART NUMBER
UF PART MARKING
LT5572EUF
5572
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
VCC = 5V, EN = High, TA = 25°C, fLO = 2GHz, fRF = 2002MHz, PLO = 0dBm.
BBPI, BBMI, BBPQ, BBMQ inputs 0.5VDC, baseband input frequency = 2MHz, I and 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
–3dB Bandwidth
–1dB Bandwidth
1.5 to 2.5
1.7 to 2.15
GHz
GHz
S22(ON)
RF Output Return Loss
EN = High (Note 6)
–13.5
dB
S22(OFF)
RF Output Return Loss
EN = Low (Note 6)
–12.5
dB
NFloor
RF Output Noise Floor
No Input Signal (Note 8)
POUT = 4dBm (Note 9)
POUT = 4dBm (Note 10)
–158.6
–152.5
–152.2
dBm/Hz
dBm/Hz
dBm/Hz
GV
Conversion Voltage Gain
20 • Log (VOUT(50Ω)/VIN(DIFF) I or Q)
–2.5
dB
POUT
Output Power
1VPP(DIFF) CW Signal, I and Q
1.4
dBm
G3LO VS LO
3 • LO Conversion Gain Difference
(Note 17)
–29.5
OP1dB
Output 1dB Compression
(Note 7)
9.3
dBm
OIP2
Output 2nd Order Intercept
(Notes 13, 14)
53.2
dBm
OIP3
Output 3rd Order Intercept
(Notes 13, 15)
21.6
dBm
IR
Image Rejection
(Note 16)
–41.2
dBc
LOFT
Carrier Leakage
(LO Feedthrough)
EN = High, PLO = 0dBm (Note 16)
EN = Low, PLO = 0dBm (Note 16)
–39.4
–58
dBm
dBm
dB
5572f
2
LT5572
ELECTRICAL CHARACTERISTICS
VCC = 5V, EN = High, TA = 25°C, fLO = 2GHz, fRF = 2002MHz, PLO = 0dBm.
BBPI, BBMI, BBPQ, BBMQ inputs 0.5VDC, baseband input frequency = 2MHz, I and Q 90° shifted (upper sideband selection).
PRF(OUT) = –10dBm, unless otherwise noted. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
LO Input (LO)
fLO
LO Frequency Range
1.5 to 2.5
PLO
LO Input Power
S11(ON)
LO Input Return Loss
EN = High, PLO = 0dBm (Note 6)
–15
dB
S11(OFF)
LO Input Return Loss
EN = Low (Note 6)
–5.3
dB
NFLO
LO Input Referred Noise Figure
at 2GHz (Note 5)
14.5
dB
GLO
LO to RF Small-Signal Gain
at 2GHz (Note 5)
25
dB
IIP3LO
LO Input 3rd Order Intercept
at 2GHz (Note 5)
–0.5
dBm
MHz
–10
0
GHz
5
dBm
Baseband Inputs (BBPI, BBMI, BBPQ, BBMQ)
BWBB
Baseband Bandwidth
–3dB Bandwidth
460
VCMBB
DC Common Mode Voltage
Externally Applied (Note 4)
0.5
RIN
Differential Input Resistance
IDC(IN)
Baseband Static Input Current
PLOBB
0.6
V
90
kΩ
(Note 4)
–20
µA
Carrier Feedthrough to BB
POUT = 0 (Note 4)
–39
dBm
IP1dB
Input 1dB Compression Point
Differential Peak-to-Peak (Notes 7, 18)
2.8
VP-P(DIFF)
ΔGI/Q
I/Q Absolute Gain Imbalance
0.07
dB
ΔϕI/Q
I/Q Absolute Phase Imbalance
0.9
Deg
Power Supply (VCC)
VCC
Supply Voltage
4.5
5
5.25
V
ICC(ON)
Supply Current
EN = High
ICC(OFF)
Supply Current, Sleep Mode
EN = 0V
120
145
mA
50
µA
tON
Turn-On Time
EN = Low to High (Note 11)
0.25
µs
tOFF
Turn-Off Time
EN = High to Low (Note 12)
1.3
µs
230
µA
Enable (EN), Low = Off, High = On
Enable
Sleep
Input High Voltage
EN = High
Input High Current
EN = 5V
Input Low Voltage
EN = Low
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: At each of the four baseband inputs BBPI, BBMI, BBPQ and BBMQ.
Note 5: VBBPI – VBBMI = 1VDC, VBBPQ – VBBMQ = 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.
1
V
0.5
V
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 of the desired signal at
f = LO + BB for BB = 2MHz and LO = 2GHz.
Note 18: The input voltage corresponding to the output P1dB.
5572f
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LT5572
U W
TYPICAL PERFOR A CE CHARACTERISTICS
VCC = 5V, EN = High, TA = 25°C, fLO = 2.14GHz,
PLO = 0dBm. BBPI, BBMI, BBPQ, BBMQ inputs 0.5VDC, baseband input frequency fBB = 2MHz, I and Q 90° shifted, without image or
LO feedthrough nulling. fRF = fBB + fLO (upper sideband selection). PRF(OUT) = –10dBm (–10dBm/tone for 2-tone measurements),
unless otherwise noted. (Note 3)
RF Output Power vs LO Frequency
at 1VP-P Differential Baseband
Drive
Supply Current vs Supply Voltage
RF OUTPUT POWER (dBm)
SUPPLY CURRENT (mA)
85°C
130
25°C
120
–40°C
110
0
2
–2
0
–2
–4
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
–6
100
4.5
5
–8
1.3
5.5
1.5
SUPPLY VOLTAGE (V)
2.3
1.7 1.9 2.1
LO FREQUENCY (GHz)
fBB1 = 2MHz
fBB2 = 2.1MHz
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
2.5
–12
1.3
2.7
1.5
2.3
1.7 1.9 2.1
LO FREQUENCY (GHz)
2.5
2.7
5572 G03
Output 1dB Compression
vs LO Frequency
12
fIM2 = fBB1 + fBB2 + fLO
fBB1 = 2MHz
fBB2 = 2.1MHz
10
OIP2 (dBm)
18
16
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
14
12
10
1.3
1.5
1.7
1.9 2.1 2.3
LO FREQUENCY (GHz)
OP1dB (dBm)
60
20
OIP3 (dBm)
–8
Output IP2 vs LO Frequency
65
22
55
2.5
45
2.7
1.3
1.5
1.7 1.9 2.1 2.3
LO FREQUENCY (GHz)
2.5
–50
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
1.5
1.7 1.9 2.1 2.3
LO FREQUENCY (GHz)
–30
–25
–35
–30
–40
–35
–40
–45
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
–55
2.7
5572 G07
2.3
1.7 1.9 2.1
LO FREQUENCY (GHz)
2.5
–60
2.6
3
3.4
3.8 4.2 4.6
2 • LO FREQUENCY (GHz)
2.7
5572 G06
–20
–50
2.5
1.5
3 • LO Leakage to RF Output
vs 3 • LO Frequency
P(3 • LO) (dBm)
P(2 • LO) (dBm)
–45
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
5572 G05
–40
1.3
0
1.3
2.7
2 • LO Leakage to RF Output
vs 2 • LO Frequency
–35
–60
6
2
5572 G04
–55
8
4
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
50
LO Feedthrough to RF Output
vs LO Frequency
LO FEEDTHROUGH (dBm)
–6
5572 G02
Output IP3 vs LO Frequency
24
–4
–10
5572 G01
26
Voltage Gain vs LO Frequency
4
VOLTAGE GAIN (dB)
140
–45
–50
–55
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
–60
–65
5
5.4
5572 G08
–70
3.9
4.5
5.1 5.7 6.3 6.9 7.5
3 • LO FREQUENCY (GHz)
8.1
5572 G09
5572f
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LT5572
U W
TYPICAL PERFOR A CE CHARACTERISTICS
VCC = 5V, EN = High, TA = 25°C, fLO = 2.14GHz,
PLO = 0dBm. BBPI, BBMI, BBPQ, BBMQ inputs 0.5VDC, baseband input frequency fBB = 2MHz, I and Q 90° shifted, without image or
LO feedthrough nulling. fRF = fBB + fLO (upper sideband selection). PRF(OUT) = –10dBm (–10dBm/tone for 2-tone measurements),
unless otherwise noted. (Note 3)
Noise Floor vs RF Frequency
–156
LO PORT, EN = LOW
–30
–160
–162
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
–164
–166
1.3
1.5
–35
–40
–45
–50
1.7 1.9 2.1 2.3
RF FREQUENCY (GHz)
–55
1.3
2.7
2.5
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
1.5
1.7 1.9 2.1 2.3
LO FREQUENCY (GHz)
2.5
1.3
2
4
–20
–16
–12 –8
–4
0
LO INPUT POWER (dBm)
4
1.5
1.7 1.9 2.1 2.3
LO FREQUENCY (GHz)
2.5
–18
–20 –16
2.7
5572 G16
–12
–4
0
–8
LO INPUT POWER (dBm)
4
Image Rejection vs LO Power
–25
–35
–30
–40
–45
–50
–60
–20
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
–16
–4
0
–12 –8
LO INPUT POWER (dBm)
8
5572 G15
–30
–55
8
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
–16
IMAGE REJECTION (dBc)
LO FEEDTHROUGH (dBm)
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
6
–12
LO Feedthrough vs LO Power
fBB1 = 2MHz
fBB2 = 2.1MHz
8
–10
5572 G14
20
10
–8
–14
1
1.3
22
2.7
–6
3
Output IP3 vs LO Power
14
2.5
–4
5572 G13
16
1.7 1.8 2.1 2.3
RF FREQUENCY (GHz)
Voltage Gain vs LO Power
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
4
2.7
18
RF PORT,
EN = HIGH,
PLO = 0dBm
–2
0
0
2.5
1.5
RF PORT,
EN = LO
5572 G12
VOLTAGE GAIN (dB)
ABSOLUTE I/Q PHASE IMBALANCE (DEG)
ABSOLUTE I/Q GAIN IMBALANCE (dB)
0.1
12
RF PORT,
EN = HIGH,
NO LO
Absolute I/Q Phase Imbalance
vs LO Frequency
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
1.7 1.9 2.1 2.3
LO FREQUENCY (GHz)
–30
–50
2.7
5
1.5
LO PORT,
EN = HIGH,
PLO = –10dBm
5572 G11
Absolute I/Q Gain Imbalance
vs LO Frequency
1.3
–20
–40
5572 G10
0.2
LO PORT, EN = HIGH, PLO = 0dBm
–10
S11 (dB)
IMAGE REJECTION (dBc)
NOISE FLOOR (dBm/Hz)
0
–25
fLO = 2GHz (FIXED)
–158
OIP3 (dBm)
LO and RF Port Return Loss
vs RF Frequency
Image Rejection vs LO Frequency
4
–35
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
–40
–45
–50
8
5572 G17
–55
–20
–16
–4
0
–12 –8
LO INPUT POWER (dBm)
4
8
5572 G18
5572f
5
LT5572
U W
TYPICAL PERFOR A CE CHARACTERISTICS
VCC = 5V, EN = High, TA = 25°C, fLO = 2.14GHz,
PLO = 0dBm. BBPI, BBMI, BBPQ, BBMQ inputs 0.5VDC, baseband input frequency fBB = 2MHz, I and Q 90° shifted, without image or
LO feedthrough nulling. fRF = fBB + fLO (upper sideband selection). PRF(OUT) = –10dBm (–10dBm/tone for 2-tone measurements),
unless otherwise noted. (Note 3)
RF CW Output Power, HD2 and
HD3 vs CW Baseband and Supply
Voltage
RF CW Output Power, HD2 and
HD3 vs CW Baseband Voltage and
Temperature
RF
–60
–70
–80
1
0
–20
25°C –30
85°C
–40°C –40
HD2 = MAX POWER AT
fLO + 2 • fBB OR fLO – 2 • fBB
–50
HD3 = MAX POWER AT
fLO + 3 • fBB OR fLO – 3 • fBB
–60
2
3
5
4
–10
–30
HD2
–40
–50
–60
–70
–80
1
0
5572 G19
5572 G20
Image Rejection vs CW Baseband
Voltage
RF 2-Tone Power (Each Tone),
IM2 and IM3 vs Baseband Voltage
and Temperature
–35
10
PLOAD (dBm) IM2, IM3 (dBc)
–40
–45
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
–50
0
IM2
–50
1
3
4
5
2
I AND Q BASEBAND VOLTAGE (VP-P,DIFF)
IM3
–20 IM2 = POWER AT
fLO + 4.1MHz
–30 IM3 = MAX POWER
AT fLO + 1.9MHz
–40 OR fLO + 2.2MHz
IM2
–50
–70
0.1
1
10
I AND Q BASEBAND VOLTAGE (VP-P,DIFF, EACH TONE)
RF
5V
5.5V
4.5V
–10
–60
fBBI = 2MHz, 2.1MHz, 0°
fBBQ = 2MHz, 2.1MHz, 90°
fBBI = 2MHz, 2.1MHz, 0°
fBBQ = 2MHz, 2.1MHz, 90°
1
10
0.1
I AND Q BASEBAND VOLTAGE (VP-P,DIFF, EACH TONE)
5572 G24
5572 G23
Noise Floor Distribution
40
fLO = 2GHz
–40°C
25°C
85°C
30 fLO = 2GHz
fNOISE = 2.02GHz
25
35
25
PERCENTAGE (%)
PERCENTAGE (%)
–40°C
25°C
85°C
0
5572 G21
IM3
Voltage Gain Distribution
30
–55
0
–20 IM2 = POWER AT
fLO + 4.1MHz
–30 IM3 = MAX POWER
AT fLO + 1.9MHz
–40 OR fLO + 2.2MHz
–70
5V, –40°C
5V, 25°C
5V, 85°C
4.5V, 25°C
5.5V, 25°C
10
5572 G22
35
–45
RF 2-Tone Power (Each Tone),
IM2 and IM3 vs Baseband and
Supply Voltage
–10
–60
1
3
4
5
2
I AND Q BASEBAND VOLTAGE (VP-P,DIFF)
–40
–50
RF
25°C
85°C
–40°C
0
IMAGE REJECTION (dBc)
–30
5V
5.5V
4.5V
–40
HD2 = MAX POWER AT
fLO + 2 • fBB OR fLO – 2 • fBB
–50
HD3 = MAX POWER AT
fLO + 3 • fBB OR fLO – 3 • fBB
–60
2
3
5
4
–35
I AND Q BASEBAND VOLTAGE (VP-P,DIFF)
I AND Q BASEBAND VOLTAGE (VP-P,DIFF)
–55
–20
PLOAD (dBm) IM2, IM3 (dBc)
HD2, HD3 (dBc)
HD2
–40
HD3
HD2, HD3 (dBc)
–10
–30
0
–20
RF CW OUTPUT POWER (dBm)
HD3
RF CW OUTPUT POWER (dBm)
0
–20
LO FEEDTHROUGH (dBm)
RF
–50
–30
10
–10
10
–10
LO Feedthrough to RF Output
vs CW Baseband Voltage
20
15
10
20
15
10
5
5
0
0
–3.2
–2.8
–2.4 –2.0 –1.6
VOLTAGE GAIN (dB)
–1.2
5572 G25
–159.4
–159 –158.6 –158.2 –157.8
5572 G26
NOISE FLOOR (dBm/Hz)
5572f
6
LT5572
U W
TYPICAL PERFOR A CE CHARACTERISTICS
VCC = 5V, EN = High, TA = 25°C, fLO = 2.14GHz,
PLO = 0dBm. BBPI, BBMI, BBPQ, BBMQ inputs 0.5VDC, baseband input frequency fBB = 2MHz, I and Q 90° shifted, without image or
LO feedthrough nulling. fRF = fBB + fLO (upper sideband selection). PRF(OUT) = –10dBm (–10dBm/tone for 2-tone measurements),
unless otherwise noted. (Note 3)
LO Leakage Distribution
45
–40°C
25°C
85°C
40
Image Rejection Distribution
35
fLO = 2GHz
30
–40°C
25°C
85°C
fLO = 2GHz
PERCENTAGE (%)
PERCENTAGE (%)
35
30
25
20
15
25
20
15
10
10
5
5
0
<–45
–43
–41
–39 –37
LO LEAKAGE (dBm)
–35
–33
5572 G27
0
<–52
–40
–36
–44
–48
IMAGE REJECTION (dBc)
5572 G28
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EN (Pin 1): Enable Input. When the EN pin voltage is higher
than 1V, the IC is turned on. When the input voltage is less
than 0.5V, the IC is turned off.
GND (Pins 2, 4, 6, 9, 10, 12, 15, 17): Ground. Pins 6, 9,
15 and the Exposed Pad, Pin 17, are connected to each
other internally. Pins 2 and 4 are connected to each other
internally and function as the ground return for the LO
signal. Pins 10 and 12 are connected to each other internally and function as the ground return for the on-chip RF
balun. For best RF performance, Pins 2, 4, 6, 9, 10, 12,
15 and the Exposed Pad, Pin 17, should be connected to
the printed circuit board ground plane.
LO (Pin 3): LO Input. The LO input is an AC-coupled singleended input with approximately 50Ω input impedance at
RF frequencies. Externally applied DC voltage should be
within the range –0.5V to (VCC + 0.5V) in order to avoid
turning on ESD protection diodes.
BBPQ, BBMQ (Pins 7, 5): Baseband Inputs for the Q channel with about 90kΩ differential input impedance. These
pins should be externally biased at about 0.5V. Applied
common mode voltage must stay below 0.6V.
VCC (Pins 8, 13): Power Supply. Pins 8 and 13 are connected to each other internally. It is recommended to use
0.1µF capacitors for decoupling to ground on each of
these pins.
RF (Pin 11): RF Output. The RF output is an AC-coupled
single-ended output with approximately 50Ω output impedance at RF frequencies. Externally applied DC voltage
should be within the range –0.5V to (VCC + 0.5V) in order
to avoid turning on ESD protection diodes.
BBPI, BBMI (Pins 14, 16): Baseband Inputs for the I channel with about 90kΩ differential input impedance. These
pins should be externally biased at about 0.5V. Applied
common mode voltage must stay below 0.6V.
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VCC
8
13
BBPI 14
V-I
BBMI 16
11 RF
0°
90°
BALUN
BBPQ 7
1 EN
V-I
BBMQ 5
2
4
6
9
GND
3
LO
10
12
15
GND
17
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The LT5572 consists of I and Q input differential voltageto-current converters, I and Q up-conversion mixers, an
RF output balun, an LO quadrature phase generator and
LO buffers.
External I and Q baseband signals are applied to the differential baseband input pins, BBPI, BBMI, and BBPQ,
BBMQ. These voltage signals are converted to currents and
translated to RF frequency by means of double-balanced
up-converting mixers. The mixer outputs are combined
in an RF output balun, which also transforms the output
impedance to 50Ω. The center frequency of the resulting
RF signal is equal to the LO signal frequency. The LO input drives a phase shifter which splits the LO signal into
in-phase and quadrature LO signals. These LO signals
are then applied to on-chip buffers which drive the upconversion mixers. Both the LO input and RF output are
single-ended, 50Ω matched and AC coupled.
Baseband Interface
The baseband inputs (BBPI, BBMI) and (BBPQ, BBMQ)
present a differential input impedance of about 90kΩ. At
each of the four baseband inputs, a capacitor of 1.8pF to
ground and a PNP emitter follower is incorporated (see
Figure 1), which limits the baseband –1dB bandwidth to
approximately 250MHz. The circuit is optimized for an
externally applied common mode voltage of 0.5V. The
baseband input pins should not be left floating because
the internal PNP’s base current will pull the common mode
voltage higher than the 0.6V limit. This may damage the part
if continued indefinitely. The PNP’s base current is about
20µA in normal operation. On the LT5572 demo board,
external 50Ω resistors to ground are included at each
baseband input to prevent this condition and to serve as
a termination resistance for the baseband connections.
The I/Q input signals to the LT5572 should be DC coupled
with an applied common mode voltage level of about
0.5V in order to bias the LT5572 at its optimum operating
point. Some I/Q test generators allow setting the common
mode voltage independently. In this case, the common
mode voltage of those generators must be set to 0.5V
(See Figure 2).
The baseband inputs should be driven differentially; otherwise, the even-order distortion products will degrade
the overall linearity severely. Typically, a DAC will be the
signal source for the LT5572. Reconstruction filters should
be placed between the DAC outputs and the LT5572’s
baseband inputs.
In Figure 3, a typical baseband interface is shown including
a 5th-order lowpass ladder filter for reconstruction. For each
baseband pin, a 0V to 1V swing is developed corresponding
to a DAC output current of 0mA to 20mA. The maximum
sinusoidal single sideband RF output power at 2.14GHz is
about +6.2dBm for full 0V to 1V swing on each baseband
5572f
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C
LT5572
RF
VCC = 5V
BALUN
FROM
Q-CHANNEL
LOMI
LOPI
BBPI
1.8pF
VCM = 0.5V
1.8pF
BBMI
5572 F01
GND
Figure 1. Simplified Circuit Schematic of the LT5572 (Only I Channel is Drawn)
50Ω
50Ω
0.5VDC
+
–
1VDC
LT5572
0.5005VDC
+
–
50Ω
1VDC
GENERATOR
GENERATOR
50Ω
EXTERNAL
LOAD
20µADC
5572 F02
Figure 2. DC Voltage Levels for a Generator Programmed at 0.5VDC for a 50Ω Load Without and With the LT5572 as a Load
C
LT5572
MAX RF
+6.2dBm
VCC
5V
BALUN
FROM
Q-CHANNEL
LOMI
L1A
0mA TO 20mA
L2A
0.5VDC
R1A
100Ω
DAC
BBPI
R2A
100Ω
C2
C1
R1B
100Ω
LOPI
L1B
L2B
0mA TO 20mA
C3
R2B
100Ω
1.8pF
1.8pF
BBMI
GND
5572 F03
GND
Figure 3. LT5572 Baseband Interface with 5th Order Filter and 0.5VCM DAC (Only I Channel is Shown)
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Table 1. Typical Performance Characteristics vs VCM for fLO = 2GHz, PLO = 0dBm
VCM (V)
0.1
0.2
0.3
0.4
0.5
0.6
ICC (mA)
77
89
101
113
126
138
GV (dB)
–1.3
–2.7
–2.1
–2.0
–1.9
–1.9
OP1dB (dBm)
0.0
4.7
7.1
8.6
9.3
9.1
OIP2 (dBm)
47
45
49
51
52
52
input (2VP-P,DIFF). This maximum RF output level is limited
by the 0.5VPEAK maximum baseband swing possible for a
0.5VDC common mode voltage level (assuming no extra
negative supply voltage available).
It is possible to bias the LT5572 to a common mode baseband voltage level other than 0.5V. Table 1 shows the typical
performance for different common mode voltages.
LO section
The internal LO input amplifier performs single-ended to
differential conversion of the LO input signal. Figure 4
shows the equivalent circuit schematic of the LO input.
The internal, differential LO signal is split into in-phase
and quadrature (90° phase shifted) signals that drive LO
buffer sections. These buffers drive the double balanced I
and Q mixers. The phase relationship between the LO input
and the internal in-phase LO and quadrature LO signals
is fixed, and is independent of start-up conditions. The
phase shifters are designed to deliver accurate quadrature
signals for an LO frequency near 2GHz. For frequencies
significantly below 1.8GHz or above 2.4GHz, the quadrature accuracy will diminish, causing the image rejection
VCC
LO
INPUT
20pF
ZIN ≈ 56Ω
5572 F04
Figure 4. Equivalent Circuit Schematic of the LO Input
OIP3 (dBm)
8.3
11.4
15.0
18.2
21.2
21.1
NFloor (dBm/Hz)
–163.2
–162.2
–160.9
–160.2
–159.2
–158.6
LOFT (dBm)
–45.6
–42.6
–42.0
–42.4
–42.4
–42.1
IR (dBc)
–42.2
–36.2
–37.0
–39.3
–41.5
–44.4
to degrade. The LO pin input impedance is about 50Ω and
the recommended LO input power is 0dBm. For lower LO
input power, the gain, OIP2, OIP3 and dynamic range will
degrade, especially below –5dBm and at TA = 85°C. For
high LO input power (e.g., 5dBm), the LO feedthrough
will increase, without improvement in linearity or gain.
Harmonics present on the LO signal can degrade the
image rejection, because they introduce a small excess
phase shift in the internal phase splitter. For the second (at
4GHz) and third harmonics (at 6GHz) at –20dBc level, the
introduced signal at the image frequency is about –57dBc
or lower, corresponding to an excess phase shift much
less than 1 degree. For the second and third harmonics at
–10dBc, still the introduced signal at the image frequency
is about –47dBc. Higher harmonics than the third will have
less impact. The LO return loss typically will be better than
14dB over the 1.7GHz to 2.4GHz range. Table 2 shows the
LO port input impedance vs frequency.
Table 2. LO Port Input Impedance vs Frequency for EN = High
and PLO = 0dBm
FREQUENCY
(MHz)
INPUT IMPEDANCE
(Ω)
1000
1400
1600
1800
2000
2200
2400
2600
45.9+j15.7
60.8+j2.1
63.2-j6.0
61.8-j14.2
56.4-j16.8
51.7-j14.7
47.3-j11.3
42.5-j8.6
S11
Mag
0.167
0.099
0.128
0.163
0.165
0.144
0.119
0.122
Angle
95
9.4
–22
–44
–61
–75
–97
–126
The input impedance of the LO port is different if the part
is in shutdown mode. The LO input impedance for EN =
Low is given in Table 3.
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Table 3. LO Port Input Impedance vs Frequency for EN = Low
and PLO = 0dBm
FREQUENCY
(MHz)
1000
1400
1600
1800
2000
2200
2400
2600
INPUT IMPEDANCE
(Ω)
51.2+j45.6
133-j11.8
97.8-j65.8
58.6-j67.8
39.0-j55.6
29.6-j43.2
23.7-j30.8
19.7-j20.5
S11
Mag
0.409
0.456
0.502
0.534
0.540
0.527
0.506
0.503
Angle
64
–4.5
–30
–51
–69
–87
–108
–130
RF Section
After up-conversion, the RF outputs of the I and Q mixers are
combined. An on-chip balun performs internal differential
to single-ended output conversion, while transforming the
output signal impedance to 50Ω. Table 4 shows the RF
port output impedance vs frequency.
Table 4. RF Port Output Impedance vs Frequency for EN = High
and PLO = 0dBm
FREQUENCY
(MHz)
OUTPUT IMPEDANCE
(Ω)
1000
1400
1600
1800
2000
2200
2400
2600
20.7+j9.9
32.2+j20.3
44.9+j21.8
56.4+j12.2
52.6+j0.5
43.0+j0.5
36.8+j5.6
32.9+j11.0
S22
Mag
0.434
0.319
0.230
0.129
0.025
0.075
0.164
0.243
Angle
153
117
90
56
10
176
153
140
For EN = Low the S22 is given in Table 6.
Table 6. RF Port Output Impedance vs Frequency for EN = Low
FREQUENCY
(MHz)
OUTPUT IMPEDANCE
(Ω)
1000
1400
1600
1800
2000
2200
2400
2600
20.3+j9.7
30.6+j20.2
41.8+j23.6
55.6+j18.5
58.3+j49.1
48.8-j0.1
40.4+j3.1
34.7+j8.3
FREQUENCY
(MHz)
OUTPUT IMPEDANCE
(Ω)
1000
1400
1600
1800
2000
2200
2400
2600
21.2+j10.1
35.3+j18.4
46.1+j14.1
47.4+j5.0
42.0+j3.0
37.5+j6.8
34.8+j11.8
32.8+j16.1
S22
Mag
0.424
0.270
0.150
0.057
0.093
0.162
0.224
0.279
Angle
153
117
97
114
157
147
134
126
Angle
154
120
95
63
28
-172
160
146
To improve S22 for lower frequencies, a shunt capacitor
can be added to the RF output. At higher frequencies, a
shunt inductor can improve the S22. Figure 5 shows the
equivalent circuit schematic of the RF output.
Note that an ESD diode is connected internally from
the RF output to ground. For strong output RF signal
levels (higher than 3dBm) this ESD diode can degrade
the linearity performance if the 50Ω termination impedance is connected directly to ground. To prevent this, a
coupling capacitor can be inserted in the RF output line.
This is strongly recommended for 1dB compression
measurements.
VCC
20pF
52.59
The RF output S22 with no LO power applied is given in
Table 5.
Table 5. RF Port Output Impedance vs Frequency for EN = High
and No LO Power Applied
S22
Mag
0.440
0.338
0.264
0.181
0.089
0.012
0.112
0.205
2.1pF
RF
OUTPUT
3nH
5572 F05
Figure 5. Equivalent Circuit Schematic of the RF Output
Enable Interface
Figure 6 shows a simplified schematic of the EN pin
interface. The voltage necessary to turn on the LT5572
is 1V. To disable (shut down) the chip, the enable voltage
must be below 0.5V. If the EN pin is not connected, the
chip is disabled. This EN = Low condition is guaranteed
by the 75k on-chip pull-down resistor. It is important
that the voltage at the EN pin does not exceed VCC by
more than 0.5V. If this should occur, the full-chip supply
5572f
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APPLICATIO S I FOR ATIO
event that the EN pin is pulled high while the VCC inputs
are low. The application board PCB layouts are shown in
Figures 8 and 9.
VCC
EN
75k
25k
5572 F06
Figure 6. EN Pin Interface
current could be sourced through the EN pin ESD protection diodes, which are not designed for this purpose.
Damage to the chip may result.
Evaluation Board
Figure 7 shows the evaluation board schematic. A good
ground connection is required for the Exposed Pad. If this
is not done properly, the RF performance will degrade.
Additionally, the Exposed Pad provides heat sinking for
the part and minimizes the possibility of the chip overheating. R1 (optional) limits the EN pin current in the
J1
J2
BBIM
Figure 8. Component Side of Evaluation Board
BBIP
R5
49.9Ω
R2
49.9Ω
16
R1
100Ω
VCC EN
LO IN
15
14
C1
100nF
13
BBMI GND
1
2
J4
VCC
3
4
BBPI VCC
12
EN
GND
11
GND
RF
10
LT5572
LO
GND
9
GND
GND
17
GND
BBMQ GND BBPQ VCC
5
6
7
R3
49.9Ω
RF
OUT
8
C2
100nF
J5
BBQM
J3
J6
BBQP
R4
49.9Ω
5572 F07
BOARD NUMBER: DC945A
Figure 7. Evaluation Circuit Schematic
Figure 9. Bottom Side of Evaluation Board
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Application Measurements
The LT5572 is recommended for basestation applications
using various modulation formats. Figure 10 shows a typical
application. Figure 11 shows the ACPR performance for
W-CDMA using 1-, 2- or 4-channel modulation. Figures
12, 13 and 14 illustrate the 1-, 2- and 4-channel W-CDMA
measurement. To calculate ACPR, a correction is made for
the spectrum analyzer noise floor (Application Note 99).
If the output power is high, the ACPR will be limited by the
linearity performance of the part. If the output power is
low, the ACPR will be limited by the noise performance of
the part. In the middle, an optimum ACPR is obtained.
–50
8, 13
I-DAC
16
V-I
I-CH
11
0°
1
EN
90°
7
Q-DAC
5
100nF
×2
RF = 1.5GHz
TO 2.5GHz
LT5572
ACPR, AltCPR (dBc)
VCC
14
PA
BALUN
Q-CH
DOWNLINK TEST
MODEL 64 DPCH
4-CH ACPR
4-CH AltCPR
–60
2-CH ACPR
1-CH AltCPR
–80
2, 4, 6, 9, 10, 12, 15, 17
–90
–30
3
VCO/SYNTHESIZER
–135
–145
2-CH AltCPR
–155
2-CH NOISE
V-I
5572 TA01a
1-CH
ACPR
–70
4-CH NOISE
BASEBAND
GENERATOR
–125
1-CH NOISE
–25
–15
–10
–5
–20
RF OUTPUT POWER PER CARRIER (dBm)
NOISE FLOOR AT 30MHz OFFSET (dBm/Hz)
5V
–165
5572 TA01b
Figure 10. 1.5GHz to 2.4GHz Direct Conversion Transmitter Application
–40
–50
–60
–70
–80
–90
SPECTRUM
ANALYSER
NOISE FLOOR
UNCORRECTED
SPECTRUM
CORRECTED
SPECTRUM
–100
–30
DOWNLINK
TEST MODEL
64 DPCH
–40
–50
–60
–70
–80
SPECTRUM
ANALYSER
NOISE
FLOOR
CORRECTED
SPECTRUM
–90
–100
–110
POWER IN 30kHz BW (dBm)
POWER IN 30kHz BW (dBm)
–40
–30
DOWNLINK TEST
MODEL 64 DPCH
POWER IN 30kHz BW (dBm)
–30
Figure 11. W-CDMA ACPR, ALTCPR and Noise vs RF
Output Power at 2140MHz for 1, 2 and 4 Channels
DOWNLINK TEST
MODEL 64
DPCH
–50
–60
–70
–80
–90
SPECTRUM
ANALYSER
NOISE
FLOOR
–100
–110
–110
UNCORRECTED SPECTRUM
–120
2.1275
2.1325 2.1375 2.1425 2.1475 2.1525
RF FREQUENCY (GHz)
5572 F12
Figure 12. 1-Channel W-CDMA Spectrum
–120
2.125
CORRECTED
SPECTRUM
2.13
2.135 2.14 2.145
RF FREQUENCY (GHz)
UNCORRECTED SPECTRUM
2.15
2.155
5572 F13
Figure 13. 2-Channel W-CDMA Spectrum
–120
2.115
2.125
2.145 2.155
2.135
RF FREQUENCY (GHz)
2.165
5572 F14
Figure 14. 4-Channel W-CDMA Spectrum
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APPLICATIO S I FOR ATIO
Because of the LT5572’s very high dynamic range,
the test equipment can limit the accuracy of the ACPR
measurement. Consult the factory for advice on the ACPR
measurement if needed.
The ACPR performance is sensitive to the amplitude match
of the BBIP and BBIM (or BBQP and BBQM) input voltage.
This is because a difference in AC voltage amplitude will
give rise to a difference in amplitude between the even-order
harmonic products generated in the internal V-I converter.
IMAGE
REJECTION
–60
–70
–90
–40
10
CALIBRATED WITH
PRF = –10dBm
–50
–80
When the temperature is changed after calibration, the
LO feedthrough and the image rejection performance will
change. This is illustrated in Figure 15. The LO feedthrough
and image rejection can also change as a function of the
baseband drive level as depicted in Figure 16.
LO FEEDTHROUGH
–20
VCC = 5V
fBBI = 2MHz, 0°
fBBQ = 2MHz, 90°
fLO = 2GHz
fRF = fBB + fLO
EN = HIGH
PLO = 0dB
0
20
40
TEMPERATURE (°C)
60
80
5572 F15
Figure 15. LO Feedthrough and Image Rejection
vs Temperature After Calibration at 25°C
PRF
0
PRF, LOFT (dBm), IR (dBc)
LO FEEDTHROUGH (dBm), IR (dB)
–40
As a result, they will not cancel out entirely. Therefore, it
is important to keep the amplitudes at the BBIP and BBIM
(or BBQP and BBQM) inputs as equal as possible.
VCC = 5V
fBBI = 2MHz, 0°
fBBQ = 2MHz, 90°
EN = HIGH
–10
–20
fLO = 2GHz
fRF = fBB + fLO
EN = HIGH
PLO = 0dB
LO FT
–30
–40
–50
–60
IR
–70
25°C
85°C
–40°C
–80
0
5
4
1
3
2
I AND Q BASEBAND VOLTAGE (VP-P(DIFF))
5572 F16
Figure 16. RF Output Power, Image Rejection and
LO Feedthrough vs Baseband Drive Voltage After
Calibration at 25°C
5572f
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PACKAGE DESCRIPTIO
UF Package
16-Lead Plastic QFN (4mm × 4mm)
(Reference LTC DWG # 05-08-1692)
0.72 ±0.05
4.35 ± 0.05
2.15 ± 0.05
2.90 ± 0.05 (4 SIDES)
PACKAGE OUTLINE
0.30 ±0.05
0.65 BSC
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
BOTTOM VIEW—EXPOSED PAD
4.00 ± 0.10
(4 SIDES)
0.75 ± 0.05
R = 0.115
TYP
15
PIN 1 NOTCH R = 0.20 TYP
OR 0.35 × 45° CHAMFER
16
0.55 ± 0.20
PIN 1
TOP MARK
(NOTE 6)
1
2.15 ± 0.10
(4-SIDES)
2
(UF16) QFN 10-04
0.200 REF
0.00 – 0.05
0.30 ± 0.05
0.65 BSC
NOTE:
1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WGGC)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
5572f
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.
15
LT5572
RELATED PARTS
PART NUMBER
Infrastructure
LT5511
LT5512
DESCRIPTION
COMMENTS
High Linearity Upconverting Mixer
DC to 3GHz High Signal Level Downconverting
Mixer
RF Output to 3GHz, 17dBm IIP3, Integrated LO Buffer
DC to 3GHz, 17dBm IIP3, Integrated LO Buffer
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 1.5GHz Direct Conversion Quadrature
Demodulator
LT5517
40MHz to 900MHz Quadrature Demodulator
LT5518
1.5GHz to 2.4GHz High Linearity Direct
Quadrature Modulator
LT5519
0.7GHz to 1.4GHz High Linearity Upconverting
Mixer
LT5520
1.3GHz to 2.3GHz High Linearity Upconverting
Mixer
LT5521
10MHz to 3700MHz High Linearity
Upconverting Mixer
LT5522
600MHz to 2.7GHz High Signal Level
Downconverting Mixer
LT5524
Low Power, Low Distortion ADC Driver with
Digitally Programmable Gain
LT5525
High Linearity, Low Power Downconverting
Mixer
LT5526
High Linearity, Low Power Downconverting
Mixer
LT5527
400MHz to 3.7GHz High Signal Level
Downconverting Mixer
LT5528
1.5GHz to 2.4GHz High Linearity Direct
Quadrature Modulator
RF Power Detectors
LTC®5505
RF Power Detectors with >40dB Dynamic
Range
LTC5507
100kHz to 1000MHz RF Power Detector
LTC5508
300MHz to 7GHz RF Power Detector
LTC5509
300MHz to 3GHz RF Power Detector
LTC5530
300MHz to 7GHz Precision RF Power Detector
LTC5531
300MHz to 7GHz Precision RF Power Detector
LTC5532
300MHz to 7GHz Precision RF Power Detector
LT5534
50MHz to 3GHz Log RF Power Detector with
60dB Dynamic Range
LTC5536
Precision 600MHz to 7GHz RF Power Detector
with Fast Comparator Output
LT5537
Wide Dynamic Range Log RF/IF Detector
High Speed ADCs
LTC2220-1
12-Bit, 185Msps ADC
LTC2249
LTC2255
14-Bit, 80Msps ADC
14-Bit, 125Msps ADC
850MHz Bandwidth, 47dBm OIP3 at 100MHz, 10.5dB to 33dB Gain Control Range
20dBm IIP3, Integrated LO Quadrature Generator
21.5dBm IIP3, Integrated LO Quadrature Generator
21dBm IIP3, Integrated LO Quadrature Generator
22.8dBm OIP3 at 2GHz, –158.2dBm/Hz Noise Floor, 50Ω Single-Ended RF and LO
Ports, 4-Channel W-CDMA ACPR = –64dBc at 2.14GHz
17.1dBm IIP3 at 1GHz, Integrated RF Output Transformer with 50Ω Matching,
Single-Ended LO and RF Ports Operation
15.9dBm IIP3 at 1.9GHz, Integrated RF Output Transformer with 50Ω Matching,
Single-Ended LO and RF Ports Operation
24.2dBm IIP3 at 1.95GHz, NF = 12.5dB, 3.15V to 5.25V Supply, Single-Ended LO
Port Operation
4.5V to 5.25V Supply, 25dBm IIP3 at 900MHz, NF = 12.5dB, 50Ω Single-Ended RF
and LO Ports
450MHz Bandwidth, 40dBm OIP3, 4.5dB to 27dB Gain Control
Single-Ended 50Ω RF and LO Ports, 17.6dBm IIP3 at 1900MHz, ICC = 28mA
3V to 5.3V Supply, 16.5dBm IIP3, 100kHz to 2GHz RF, NF = 11dB, ICC = 28mA,
–65dBm LO-RF Leakage
IIP3 = 23.5dBm and NF = 12.5dBm at 1900MHz, 4.5V to 5.25V Supply, ICC = 78mA
21.8dBm OIP3 at 2GHz, –159.3dBm/Hz Noise Floor, 50Ω, 0.5VDC Baseband
Interface, 4-Channel W-CDMA ACPR = –66dBc at 2.14GHz
300MHz to 3GHz, Temperature Compensated, 2.7V to 6V Supply
100kHz to 1GHz, Temperature Compensated, 2.7V to 6V Supply
44dB Dynamic Range, Temperature Compensated, SC70 Package
36dB Dynamic Range, Low Power Consumption, SC70 Package
Precision VOUT Offset Control, Shutdown, Adjustable Gain
Precision VOUT Offset Control, Shutdown, Adjustable Offset
Precision VOUT Offset Control, Adjustable Gain and Offset
±1dB Output Variation over Temperature, 38ns Response Time, Log Linear
Response
25ns Response Time, Comparator Reference Input, Latch Enable Input,
–26dBm to +12dBm Input Range
Low Frequency to 1GHz, 83dB Dynamic Range, 2.7V to 5.25V Supply
Single 3.3V Supply, 910mW Consumption, 67.5dB SNR, 80dB SFDR, 775MHz
Full Power BW
Single 3V Supply, 222mW Consumption, 73dB SNR, 90dB SFDR
Single 3V Supply, 395mW Consumption, 72.4dB SNR, 88dB SFDR, 640MHz
Full Power BW
5572f
16 Linear Technology Corporation
LT 1205 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2005