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PDF LTC5585 Data sheet ( Hoja de datos )
| Número de pieza | LTC5585 | |
| Descripción | Wideband IQ Demodulator | |
| Fabricantes | Linear | |
| Logotipo |  |
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LTC5585
FEATURES
Wideband IQ Demodulator
with IIP2 and DC Offset
Control
DESCRIPTION
n 400MHz to 4GHz Operating Frequency
n High IIP3: 28.7dBm at 700MHz, 25.7dBm at 1.95GHz
n High IIP2: 70dBm at 700MHz, 60dBm at 1.95GHz
n User Adjustable IIP2 Up to 80dBm
n User Adjustable DC Offset Null
n High Input P1dB: 16dBm at 1950MHz
n I/Q Bandwidth of 530MHz or Higher
n Image Rejection: 43dB at 1950MHz
n Noise Figure: 13.5dB at 700MHz
12.7dB at 1.95GHz
n Conversion Gain: 2.0dB at 700MHz
2.4dB at 1.95GHz
n Single-Ended RF with On-Chip Transformer
n Shutdown Mode
n Operating Temperature Range (TC): –40°C to 105°C
n 24-Lead 4mm × 4mm QFN Package
APPLICATIONS
n LTE/W-CDMA/TD-SCDMA Base Station Receivers
n Wideband DPD Receivers
n Point-To-Point Broadband Radios
n High Linearity Direct Conversion I/Q Receivers
n Image Rejection Receivers
The LTC®5585 is a direct conversion quadrature demodu-
lator optimized for high linearity receiver applications in
the 400MHz to 4GHz frequency range. It is suitable for
communications receivers where an RF signal is directly
converted into I and Q baseband signals with bandwidth
of 530MHz or higher. The LTC5585 incorporates balanced
I and Q mixers, LO buffer amplifiers and a precision, high
frequency quadrature phase shifter. The integrated on-chip
broadband transformer provides a single-ended interface
at the RF input with simple off-chip L-C matching. In ad-
dition, the LTC5585 provides four analog control voltage
interface pins for IIP2 and DC offset correction, greatly
simplifying system calibration.
The high linearity of the LTC5585 provides excellent spur-
free dynamic range for the receiver. This direct conversion
demodulator can eliminate the need for intermediate fre-
quency (IF) signal processing, as well as the corresponding
requirements for image filtering and IF filtering. These
I/Q outputs can interface directly to channel-select filters
(LPFs) or to baseband amplifiers.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Direct Conversion Receiver with IIP2 and DC Offset Calibration
5V
BPF
LNA BPF
RF
INPUT RF
VCC
I+ LPF
VGA
I– A/D
LO INPUT
LO
ENABLE
EN
0°
LTC5585
90°
IP2 AND DC
OFFSET CAL
IP2 ADJUST
DC OFFSET
IP2 AND DC
OFFSET CAL
DC OFFSET
IP2 ADJUST
Q+ LPF
Q–
VGA
D/A
D/A
D/A
D/A
A/D
5585 TA01a
For more information www.linear.com/LTC5585
IIP2 vs IP2I, IP2Q Trim Voltage
120
110
I, –40°C
I, 25°C
I, 85°C
Q, –40°C
Q, 25°C
Q, 85°C
fRF = 700MHz
I, 105°C
Q, 105°C
100
90
80
70
60
50
40
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
IP2I, IP2Q (V)
5585 G09
5585fb
1
1 page  
LTC5585
ELECTRICAL CHARACTERISTICS
SYMBOL
IEIP2H
VREF
VREF(RANGE)
ZREF
VCM
ZOUT
BWBB
PARAMETER
EIP2 Pin Input Current
REF Pin Voltage
REF Pin Voltage Range
REF Input Impedance
DCOI, DCOQ, IP2I, IP2Q Pin Voltage
DCOI, DCOQ, IP2I, IP2Q Voltage Range
DCOI, DCOQ, IP2I, IP2Q Impedance
DCOI, DCOQ, IP2I, IP2Q Settling Time
DC Offset Adjustment Range
DC Offset Drift Over Temperature
I+, I–, Q+, Q– Common Mode Voltage
I+, I–, Q+, Q– Output Impedance
I+, I–, Q+, Q– Output Bandwidth
CONDITIONS
EIP2 = 5.0V
With REF Pin Unloaded
When Driven with External Source
(Note 11)
Unloaded
When Driven with External Source
(Note 11)
For Step Input, Output with 90% of Final Value
DCOI, DCOQ Swept from 0V to 1V, EDC = 5V
Unadjusted, EDC = 0V
Single Ended
100Ω External Pull-Up, –3dB Corner Frequency
MIN TYP MAX
50
0.5
0.4 to 0.7
2||1
0.5
0 to 2VREF
8||1
20
±20
20
VCC – 1.5
100||6
530
UNITS
μA
V
V
kΩ||pF
V
V
kΩ||pF
ns
mV
μV/°C
V
Ω||pF
MHz
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: Tests are performed with the test circuit of Figure 1.
Note 3: The LTC5585 is guaranteed to be functional over the –40°C to
105°C case temperature operating range.
Note 4: DSB noise figure is measured at the baseband frequency of 15MHz
with a small-signal noise source without any filtering on the RF input and
no other RF signal applied.
Note 5: Performance at the RF frequencies listed is measured with external
RF and LO impedance matching, as shown in the table of Figure 1.
Note 6: The complementary outputs (I+, I– and Q+, Q–) are combined
using a 180° phase-shift combiner.
Note 7: Noise figure under blocking conditions (NFBLOCKING) is measured
at an output frequency of 60MHz with RF input signal at fLO + 1MHz. Both
RF and LO input signals are appropriately filtered, as well as the baseband
output. NFBLOCKING measured at 840MHz, 2140MHz and 2500MHz only.
Note 8: Voltage conversion gain is calculated from the average measured
power conversion gain of the I and Q outputs using the test circuit shown
in Figure 1. Power conversion gain is measured with a 100Ω differential
load impedance on the I and Q outputs.
Note 9: Baseband outputs have a 100Ω external pull-up resistor to VCC as
shown in the test circuit shown in Figure 1.
Note 10: Image rejection is calculated from the measured gain error and
phase error using the method listed in the appendix.
Note 11: The DCOI, DCOQ, IP2I, IP2Q pins have an 8k internal resistor to
ground. The REF pin has a 2k internal resistor to ground. If unconnected,
these pins will float up to 500mV through internal current sources. A low
output resistance voltage source is recommended for driving these pins.
Note 12: This is the recommended operating range, operation outside the
listed range is possible with degraded performance to some parameters.
Note 13: DC offset measured differentially between I+ and I– and between
Q+ and Q–. The reported value is the mean of the absolute values of the
characterization data distribution.
Note 14: Baseband amplitude is within 10% of final value.
Note 15: Baseband amplitude is at least 30dB down from its on state.
For more information www.linear.com/LTC5585
5585fb
5
5 Page 
LTC5585
T YPICAL PERFORMANCE CHARACTERISTICS 1950MHz application. VCC = 5V, EN = 5V, EDC = 0V,
DRCEFB=lo0c.k5sVa,nEdIPM2in=i-0CVi,rcTuCit=s 2P5S°CCJ,-P2-L1O 1=860d°Bcmom, fbLiOn=er1a9t4b0aMsHebz,anfRdF1ou=tp1u9t5s0dMeH-ezm, fbReFd2d=e1d9f5ro1mMHmze, afBsBur=em10eMntHuz,nlPeRsFs1o=thPeRrFw2i=se–5ndoBtemd.,
Test circuit with RF and LO ports impedance matched as in Figure 1.
DSB Noise Figure Distribution,
I Side
100
90
TC = –40°C
TC = 25°C
80
TC = 85°C
TC = 105°C
70
60
50
40
30
20
10
0
11
12 13 14 15 16
DSB NOISE FIGURE (dB)
17
5585 G39
DSB Noise Figure Distribution,
Q Side
100
90
TC = –40°C
TC = 25°C
80
TC = 85°C
TC = 105°C
70
60
50
40
30
20
10
0
11
12 13 14 15 16
DSB NOISE FIGURE (dB)
17
5585 G40
IIP2 Distribution, I Side
100
90
TC = –40°C
TC = 25°C
80
TC = 85°C
TC = 105°C
70
60
50
40
30
20
10
0
70 75 80 85 90
IIP2 (dBm)
95 100
5585 G41
IIP2 Distribution, Q Side
100
90
TC = –40°C
TC = 25°C
80
TC = 85°C
TC = 105°C
70
60
50
40
30
20
10
0
70 75 80 85 90 95 100
IIP2 (dBm)
5585 G42
Phase Error Distribution
30 TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
20
Gain Error Distribution
70
60
50
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
40
30
20
10
0
–0.1
–0.06 –0.02 0.02 0.06
GAIN ERROR (dB)
0.1
5585 G43
Image Rejection Distribution
(Note 10)
50 TC = –40°C
TC = 25°C
40
TC = 85°C
TC = 105°C
30
20
10
10
0
–1
–0.8 –0.6 –0.4 –0.2
PHASE ERROR (DEGREES)
0
5585 G44
0
40 42.5 45 47.5 50 52.5 55 57.5 60
IMAGE REJECTION (dB)
5585 G45
For more information www.linear.com/LTC5585
5585fb
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC5585.PDF ] | |
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