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PDF LTC5598 Data sheet ( Hoja de datos )
| Número de pieza | LTC5598 | |
| Descripción | 5MHz to 1600MHz High Linearity Direct Quadrature Modulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
n Frequency Range: 5MHz to 1600MHz
n High Output IP3: +27.7dBm at 140MHz
+22.9dBm at 900MHz
n Low Output Noise Floor at 6MHz Offset:
No Baseband AC Input: –161.2dBm/Hz
POUT = 5.5dBm: –160dBm/Hz
n Low LO Feedthrough: –55dBm at 140MHz
n High Image Rejection: –50.4dBc at 140MHz
n Integrated LO Buffer and LO Quadrature Phase
Generator
n 50Ω Single-Ended LO and RF Ports
n >400MHz Baseband Bandwidth
n 24-Lead QFN 4mm × 4mm Package
n Pin-Compatible with Industry Standard Pin-Out
n Shut-down Mode
APPLICATIONS
n Point-to-Point Microwave Link
n Military Radio
n Basestation Transmitter GSM/EDGE/CDMA2K
n 700MHz LTE Basestation Transmitter
n Satellite Communication
n CATV/Cable Broadband Modulator
n 13.56MHz/UHF RFID Modulator
LTC5598
5MHz to 1600MHz
High Linearity Direct
Quadrature Modulator
DESCRIPTION
The LTC®5598 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
point-to-point microwave link, GSM, EDGE, CDMA,
700MHz band LTE, CDMA2000, CATV applications and
other systems. It may also be configured as an image
reject upconverting 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 a buffer, which converts the differential mixer signals
to a 50Ω single-ended buffered RF 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 or differential inputs, and precision
quadrature generators that produce the LO drive for the
mixers. The supply voltage range is 4.5V to 5.25V, with
about 168mA current.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
5MHz to 1600MHz Direct Conversion Transmitter Application
I-DAC
EN
5V
VCC
V-I
I-CHANNEL
0o
90o
Q-CHANNEL
1nF
x2
LTC5598
4.7μF
x2
RF = 5MHz
TO 1600MHz
PA
10nF
Q-DAC
V-I
BASEBAND
GENERATOR
10nF
50Ω
5598 TA01
10nF 470nF
VCO/SYNTHESIZER
Noise Floor vs RF Output Power
and Differential LO Input Power
–152
–154
–156
fLO = 140MHz; fBB = 2kHz; CW (NOTE 3)
20dBm
19.3dBm
13.4dBm
10.4dBm
8.4dBm
6.4dBm
–158
–160
–162
–14 –12 –10 –8 –6 –4 –2 0 2 4 6 8
RF OUTPUT POWER (dBm)
5598 TA02
5598f
1
1 page  
LTC5598
TYPICAL PERFORMANCE CHARACTERISTICS VCC = 5V, EN = 5V, TA = 25ºC, fRF = fLO – fBB, PLO =
0dBm single-ended, BBPI, BBMI, BBPQ, BBMQ common-mode DC voltage VCMBB = 0.5VDC, I&Q baseband input signal = 100kHz,
0.8VPP,DIFF, two-tone baseband input signal = 2MHz, 2.1MHz, 0.5VPP,DIFF each tone, I&Q 90° shifted (lower side-band selection);
fNOISE = fLO – 6MHz; unless otherwise noted. (Note 11)
Supply Current vs Temperature
180
Voltage Gain vs RF Frequency
–1
Output IP3 vs RF Frequency
29
5.25V
170
5.0V
160
–2
–3
27
25
23
150 4.5V
140
–40
–15 10 35 60
TEMPERATURE (°C)
85
5598 G01
–4
–5
10
5V, 25°C
5.25V, 25°C
4.5V, 25°C
5V, –40°C
5V, 85°C
100
1000
RF FREQUENCY (MHz)
5598 G02
21
5V, 25°C
5.25V, 25°C
19 4.5V, 25°C
5V, –40°C
5V, 85°C
17
10
100
1000
RF FREQUENCY (MHz)
5598 G03
Output IP2 vs RF Frequency
85
Output 1dB Compression
vs RF Frequency
10
LO Feedthrough to RF Output
vs LO Frequency
–40
80
75
70
65 5V, 25°C
5.25V, 25°C
60 4.5V, 25°C
5V, –40°C
5V, 85°C
55
10
100
1000
RF FREQUENCY (MHz)
5598 G04
8
6
4
2
0
10
5V, 25°C
5.25V, 25°C
4.5V, 25°C
5V, –40°C
5V, 85°C
100 1000
RF FREQUENCY (MHz)
5598 G05
–50
–60
–70
10
5V, 25°C
5.25V, 25°C
4.5V, 25°C
5V, –40°C
5V, 85°C
100 1000
LO FREQUENCY (MHz)
5598 G06
Image Rejection vs LO Frequency
–20
5V, 25°C
5.25V, 25°C
–30
4.5V, 25°C
5V, –40°C
5V, 85°C
–40
–50
–60
Noise Floor vs RF Frequency
(No AC Baseband Input Signal)
–145
–150
5V, 25°C
5.25V, 25°C
4.5V, 25°C
5V, –40°C
5V, 85°C
(NOTE 3)
–155
–160
–70
10
–165
100 1000
10
100 1000
LO FREQUENCY (MHz)
5598 G07
RF FREQUENCY (MHz)
5598 G08
RF Two-Tone Power (Each Tone),
IM2 and IM3 vs RF Frequency
0 –40
fRF, EACH = fLO – fBB1
–10
fIM3 = fLO + 2*fBB1 + fBB2
–20
fIM3 = fLO – 2*fBB1 + fBB2
–30
–50
–60
–70
–40 –80
–50 fIM2 = fLO – fBB1 – fBB2
–90
–60 –100
10 100 1000
RF FREQUENCY (MHz)
5598 G09
5598f
5
5 Page 
APPLICATIONS INFORMATION
Table 3. LOP Port Input Impedance vs Frequency for EN = Low
and PLO = 0dBm (LOM AC Coupled with 50Ω to Ground).
FREQUENCY
(MHz)
LO INPUT
IMPEDANCE
REFLECTION COEFFICIENT
MAG ANGLE
0.1
1376 – j84.4
0.930
–0.3
1
541 – j1593
0.980
–3.2
2
177 – j877
0.977
–6.2
4
75.3 – j452
0.965
–12.2
8
49.2 – j228
0.918
–23.6
16
43.3 – j117
0.784
–41.8
30
40.7 – j64.1
0.585
–62.7
60
39.1 – j34.6
0.382
–86
100
37.6 – j23.8
0.296
–102
200
33.4 – j16.4
0.275
–124
400
27.5 – j11.1
0.320
–145
800
20.1 – j4.9
0.430
–167
1000 17.5 – j1.6 0.479
–176
1250 15.3 + j2.1 0.532
175
1500 13.8 + j5.6 0.571
167
1800 12.8 + j9.7 0.605
157
Table 4. LOP Port Input Impedance vs Frequency for EN = High
and PLO = 10dBm (LOM AC Coupled with 50Ω to Ground).
FREQUENCY
(MHz)
LO INPUT
IMPEDANCE
REFLECTION COEFFICIENT
MAG ANGLE
0.1
360-j14.8
0.756
–0.7
1
349-j70.5
0.758
–3.2
2
311-j113
0.752
–6.0
4
240-j148
0.739
–10.9
8
148-j146
0.715
–19.7
16
81.3-j102
0.641
–35.2
30
55.4-j61.6
0.506
–54.7
60
45.7-j34.4
0.341
–77.4
100
43.0-j24.1
0.261
–91.6
200
38.0-j17.1
0.234
–114
400
32.0-j12.5
0.265
–137
800
23.6-j8.3
0.374
–156
1000 19.8-j5.6 0.438
–165
1250 15.8-j1.7 0.520
–176
1500 13.5+j2.4 0.575
174
1800 12.0+j7.3 0.619
162
LTC5598
Table 5. LOP Port Input Impedance vs Frequency for EN = Low
and PLO = 10dBm (LOM AC Coupled with 50Ω to Ground).
FREQUENCY
(MHz)
LO INPUT
IMPEDANCE
REFLECTION COEFFICIENT
MAG ANGLE
0.1
454 – j30.5
0.802
–0.9
1
423 – j102
0.780
–3.2
2
365 – j165
0.796
–5.9
4
249 – j219
0.798
–11.4
8
117 – j179
0.781
–22.4
16
60.7 – j106
0.697
–40.3
30
43.1 – j62.0
0.559
–62.4
60
38.6 – j34.6
0.386
–86.7
100
37.6 – j23.9
0.297
–102
200
33.5 – j16.5
0.274
–124
400
27.6 – j11.3
0.319
–145
800
20.2 – j5.1
0.429
–166
1000 17.7 – j1.7 0.478
–175
1250 15.2 + j2.0 0.533
175
1500 13.9 + j5.4 0.570
167
1800 12.9 + j9.5 0.604
158
0
–5
–10
–15
EN = LOW; PLO = 0dBm
EN = LOW; PLO = 10dBm
–20
EN = HIGH; PLO = 0dBm
EN = HIGH; PLO = 10dBm
C9, C10: 2.2pF; L1, L2: 3.3nH;
C5, C7: 10nF
–25
1 10 100
FREQUENCY (MHz)
1000
5598 F04
Figure 4. LOP Port Return Loss vs Frequency
for Standard Board (See Figure 10)
5598f
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC5598.PDF ] | |
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