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PDF LTC5584 Data sheet ( Hoja de datos )
| Número de pieza | LTC5584 | |
| Descripción | 30MHz to 1.4GHz IQ Demodulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Features
n I/Q Bandwidth of 530MHz or Higher
n High IIP3: 31dBm at 450MHz, 28dBm at 900MHz
n High IIP2: 70dBm at 450MHz, 65dBm at 900MHz
n User Adjustable IIP2 to >80dBm
n User Adjustable DC Offset Null
n High Input P1dB: 13.1dBm at 900MHz
n Image Rejection: 45dB at 900MHz
n Noise Figure: 9.9dB at 450MHz
10dB at 900MHz
n Conversion Gain: 5.4dB at 450MHz
5.7dB at 900MHz
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
LTC5584
30MHz to 1.4GHz IQ
Demodulator with IIP2 and
DC Offset Control
Description
The LTC®5584 is a direct conversion quadrature demodu-
lator optimized for high linearity receiver applications in
the 30MHz to 1.4GHz frequency range. It is also usable
in the 10MHz to 30MHz and 1.4GHz to 2GHz ranges with
reduced performance. 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 LTC5584 incorporates balanced I and Q mix-
ers, LO buffer amplifiers and a precision, high frequency
quadrature phase shifter. In addition, the LTC5584 provides
four analog control voltage interface pins for IIP2 and DC
offset correction, greatly simplifying system calibration.
The high linearity of the LTC5584 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
BPF
LNA BPF
RF
INPUT
RF+
RF–
5V
VCC
I+ LPF
I–
VGA
IP2 AND DC
OFFSET CAL
IP2 ADJUST
DC OFFSET
LO INPUT
LO
0°
LTC5584
90°
IP2 AND DC
OFFSET CAL
DC OFFSET
IP2 ADJUST
ENABLE
EN
Q+ LPF
Q–
VGA
A/D
D/A
D/A
D/A
D/A
A/D
5584 TA01a
IIP2 vs IP2I, IP2Q Trim Voltage
130
120
I, –40°C
I, 25°C
I, 85°C
Q, –40°C
Q, 25°C
Q, 85°C
fRF = 450MHz
I, 105°C
Q, 105°C
110
100
90
80
70
60
50
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
IP2I, IP2Q (V)
5584 TA01b
5584f
1
1 page  
LTC5584
DC Performance Characteristics EN = 5V, EDC = 0V and EIP2 = 0V. Test circuit shown in Figure 1
Supply Current vs Supply Voltage
260
250
TC = –40°C
TC = 25°C
240
TC = 85°C
TC = 105°C
230
220
210
200
190
180
170
160
4.75
5
SUPPLY VOLTAGE (V)
5.25
5585 G01
REF Voltage vs Temperature
550
545
VCC = 4.75V
VCC = 5V
540 VCC = 5.25V
535
530
525
520
515
510
505
500
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
5584 G02
Typical Performance Characteristics
EIP2
=
0V,
REF
=
0.5V,
TC
=
25°C,
PLO
=
6dBm,
fLO
=
130MHz,
fRF1
=
140MHz,
fRF2
=
114401MMHHzz,afpBpBli=ca1t0ioMnH. zV,CPCR=F15=V,PERNF2==5–V,5EdDBmC ,=
0V,
DC Blocks and Mini-Circuits PSCJ-2-1 180° combiner at baseband outputs de-embedded from measurement unless otherwise noted.
Test circuit with RF and LO ports impedance matched as in Figure 1.
IIP3 and P1dB vs Temperature (TC)
50 I, –40°C Q, –40°C
45
I, 25°C
I, 85°C
Q, 25°C
Q, 85°C
I, 105°C
Q, 105°C
40
IIP3
35
30
25
20
15
10
80
P1dB
100 120 140 160 180 200
LO FREQUENCY (MHz)
5584 G03
IIP3 and P1dB vs Supply Voltage
(VCC)
50 I, 4.75V
45
I, 5.0V
I, 5.25V
Q, 4.75V
Q, 5.0V
Q, 5.25V
TC = 25°C
40
IIP3
35
30
25
20
15
10
80
P1dB
100 120 140 160 180 200
LO FREQUENCY (MHz)
5584 G04
IIP3 vs LO Power
50 I, 0dBm Q, 0dBm
45
I, 6dBm
I, 10dBm
Q, 6dBm
Q, 10dBm
40
TC = 25°C
35
30
25
20
15
10
80
100 120 140 160 180 200
LO FREQUENCY (MHz)
5584 G05
5584f
5
5 Page 
LTC5584
T ypical Performance Characteristics 900MHz application. VCC = 5V, EN = 5V,
EDC
PRF1
=
=
0V, EIP2 = 0V, REF
PRF2 = –5dBm, DC
= 0.5V,
Blocks
TaCnd=
M25in°iC-,CPirLcOui=ts6PdSBCmJ,-2fL-O1
=18809°0McoHmzb, ifnReFr1
a=t9b0a0sMebHazn,dfRoFu2t=pu9t0s1dMe-Hezm, bfBeBd=de1d0MfroHmz,
measurement
unless otherwise noted. Test circuit with RF and LO ports impedance matched as in Figure 1.
Noise Figure vs RF Input Power
23
PLO = 0dBm
PLO = 6dBm
PLO = 10dBm
21 TC = 25°C
19
fLO = 884MHz
fRF = 885MHz
fNOISE = 60MHz
17
15
13
11
9
–20
–15 –10 –5 0
5
RF INPUT POWER (dBm)
10
5584 G49
DC Offset vs Temperature (TC)
10.0
I, –40°C
Q, –40°C
I, 25°C
Q, 25°C
7.5
I, 85°C
I, 105°C
Q, 85°C
Q, 105°C
5.0
2.5
0
–2.5
–5.0
400
600 800 1000 1200
LO FREQUENCY (MHz)
1400
5584 G52
LO to RF Leakage and RF to LO
Isolation
–30 L-R, –40°C R-L, –40°C
–40
L-R, 25°C
L-R, 85°C
R-L, 25°C
R-L, 85°C
L-R, 105°C R-L, 105°C
–50
–60
–70
–80
–90
–100
400
600 800 1000 1200
LO FREQUENCY (MHz)
1400
5584 G55
Noise Figure and Conversion
Gain vs Temperature (TC)
20
I, –40°C
Q, –40°C
18 I, 25°C
Q, 25°C
16
I, 85°C
I, 105°C
Q, 85°C
Q, 105°C
14
12 NF
10
8
6 GAIN
4
2
0
400 600 800 1000 1200 1400
LO FREQUENCY (MHz)
5584 G50
DC Offset vs LO Power
10.0
I, 0dBm
Q, 0dBm
I, 6dBm
Q, 6dBm
7.5 I, 10dBm Q, 10dBm
TC = 25°C
5.0
2.5
0
–2.5
–5.0
400
600 800 1000 1200
LO FREQUENCY (MHz)
1400
5584 G53
Image Rejection vs Temperature
100 TC = –40°C
90
TC = 25°C
TC = 85°C
80 TC = 105°C
70
60
50
40
30
20
400
600 800 1000 1200
LO FREQUENCY (MHz)
1400
5584 G56
Noise Figure and Conversion
Gain vs LO Power
20 I, 0dBm
18 I, 6dBm
Q, 0dBm
Q, 6dBm
TC = 25°C
I, 10dBm Q, 10dBm
16
14
12 NF
10
8
6 GAIN
4
2
0
400 600 800 1000 1200 1400
LO FREQUENCY (MHz)
5584 G51
DC Offset vs DCOI, DCOQ Control
Voltage
40
35
30
25
20
15
10
5
0
–5
–10
–15
–20
–25
0
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
fLO = 900MHz
EDC = 5V
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
DCOI, DCOQ (V)
5584 G54
Conversion Gain Distribution
70 TC = –40°C
60
TC = 25°C
TC = 85°C
TC = 105°C
50
40
30
20
10
0
4.7
4.9 5.1 5.3 5.5 5.7 5.9
CONVERSION GAIN (dB)
5584 G57
5584f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC5584.PDF ] | |
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