LT5502 Datasheet PDF - Linear Technology

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LT5502
Linear Technology

Part Number LT5502
Description 400MHz Quadrature IF Demodulator with RSSI
Page 12 Pages


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FEATURES
s Single 1.8V to 5.25V Supply
s IF Frequency Range: 70MHz to 400MHz
s 84dB Limiting IF Gain
s 90dB Linear RSSI Range
s 7.7MHz Lowpass Output Filter
s Baseband I/Q Amplitude Imbalance: <0.7dB
s 4dB Noise Figure
s Low Supply Current: 25mA
s Outputs Biased Up While in Standby
s Shutdown Current: 1µA
s 24-Lead Narrow SSOP Package
U
APPLICATIO S
s IEEE802.11
s High Speed Wireless LAN
s Wireless Local Loop
TYPICAL APPLICATIO
Final Electrical Specifications
LT5502
400MHz Quadrature
IF Demodulator with RSSI
January 2001
DESCRIPTIO
The LT®5502 is a 70MHz to 400MHz monolithic integrated
quadrature IF demodulator. It consists of an IF limiter,
quadrature down mixers, integrated lowpass filters, and
divide-by-two LO buffers. The demodulator provides all
building blocks for demodulation of I and Q baseband
signals with a single supply voltage of 1.8V to 5.25V. The
IF limiter has 84dB small-signal gain, and a built-in receive
signal strength indicator (RSSI) with over 90dB linear
range. The input referred noise-spectral-density is
1.45nV/Hz, which is equivalent to a 4dB noise figure
when the input is terminated with a 50source. The
integrated lowpass output filters act as antialiasing and
pulse-shaping filters for demodulated I/Q-baseband sig-
nals. The 3dB cutoff frequency of the filters is about
7.7MHz. The VCO frequency is required to be twice the
desired operating frequency to provide quadrature local
oscillator (LO) signals to the mixers. The standby mode
provides fast transient response to the receive mode with
reduced supply current when the I/Q outputs are
AC-coupled to a baseband chip.
, LTC and LT are registered trademarks of Linear Technology Corporation.
IF
INPUT
2XLO
INPUT
C2
1µF
C3
22nF
IF+
R1
240
IF
2XLO+
2XLO
ENABLE EN
2V
C1
1nF
VCC
90°
÷2
0°
LT5502
GND
I/Q Output Swing, RSSI Output vs IF Input Power
1200
1.2
IOUT+
IOUT–
QOUT+
QOUT–
RSSI
BASEBAND
DIFFERENTIAL
I/Q OUTPUTS
C4
1.8pF
5502 TA01a
1000
1.0
800 0.8
600 0.6
400 0.4
200
–85
–70 –55 –40 –25 –10
IF INPUT POWER (dBm)
0.2
5
5502 TA01b
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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
1



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LT5502
ABSOLUTE AXI U RATI GS
(Note 1)
Power Supply Voltage ............................................ 5.5V
LO Input Power .................................................. 10dBm
IF Input Power .................................................... 10dBm
Operating Ambient
Temperature (Note 2) ..............................–40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Voltage on any Pin not to Exceed ............................. VCC
UW U
PACKAGE/ORDER I FOR ATIO
IOUT+
IOUT–
GND
1
2
3
VCC 4
GND 5
IF+ 6
IF7
GND 8
GND 9
EN 10
STBY 11
IFt+ 12
TOP VIEW
24 QOUT+
23 QOUT–
22 VCC
21 GND
20 GND
19 2XLO+
18 2XLO
17 VCC
16 VCC
15 RSSI
14 GND
13 IFt
ORDER PART
NUMBER
LT5502EGN
GN PACKAGE
24-LEAD NARROW PLASTIC SSOP
TJMAX = 150°C, θJA = 85°C/W
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS VCC = 3V, f2XLO = 570MHz, P2XLO = –10dBm, fIF = 280MHz,
PIF = –50dBm, TA = 25°C, unless otherwise noted. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP
IF Input
fIF Frequency Range
3dB Limiting Sensitivity
70 to 400
– 79
Noise Figure
Terminated 50Source
4
DC Common Mode Voltage
2.6
Demodulator I/Q Output
I/Q Output Voltage Swing
Differential
850
I/Q Amplitude Mismatch
0.1
I/Q Phase Mismatch
0.6
Output Driving Capability
DC Common Mode Voltage
Differential; CMAX = 10pF
1.5
1.84
RSSI
Linear Dynamic Range (Note 4)
±3dB Linearity Error
90
Output Impedance
3.8
Output Voltage
Input = – 70dBm
0.27 0.41
Output Voltage
Input = 0dBm
0.8 1.01
Output Voltage Slope
Input from –70dBm to 0dBm
8.7
Linearity Error
Input from –70dBm to 0dBm
1
Baseband Lowpass Filter
3dB Cutoff Frequency
7.7
Group Delay Ripple
16.4
MAX
0.7
0.54
1.2
UNITS
MHz
dBm
dB
V
mVP-P
dB
DEG
k
V
dB
k
V
V
mV/dB
dB
MHz
ns
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LT5502
ELECTRICAL CHARACTERISTICS VCC = 3V, f2XLO = 570MHz, P2XLO = –10dBm, fIF = 280MHz,
PIF = –50dBm, TA = 25°C, unless otherwise noted. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
2XLO
f2XLO
P2XLO
Frequency Range
Input Power
DC Common Mode Voltage
140 to 800
– 20
2.6
–5
MHz
dBm
V
Power Supply
VCC Supply Voltage
ICC Supply Current
IOFF Shutdown Current
Standby Mode Current
EN = High
EN = Low; Standby = Low
EN = Low; Standby = High
1.8 5.25
25 32
1 100
2.6 3.5
V
mA
µA
mA
Note 1: Absolute Maximum Ratings are those values beyond which the life
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 3.
Note 4: Tests are performed as shown in the configuration of Figure 1 for
IF input.
TYPICAL PERFOR A CE CHARACTERISTICS (Note 3)
Power Supply Current
vs Temperature
36
TA = 85°C
32
28
TA = 25°C
24
20 TA = –40°C
I/Q Output Swing vs Temperature
1200
fIF = 280MHz
TA = 85°C
1000
TA = 25°C
800
TA = –40°C
600
I/Q Output Swing vs IF Input Power
1200
VCC = 3V
fIF = 280MHz
1000
TA = 85°C
800 TA = 25°C
600
TA = –40°C
400
16
1.8
2.5 3.5 4.5
SUPPLY VOLTAGE (V)
5.5
5502 G01
400
1.8
2.5 3.5 4.5
SUPPLY VOLTAGE (V)
5.5
5502 G02
200
–85
–70 –55 –40 –25 –10
IF INPUT POWER (dBm)
5
5502 G03
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LT5502
TYPICAL PERFOR A CE CHARACTERISTICS (Note 3)
I/Q Output Swing vs IF Input Power
1200
VCC = 3V
TA = 25°C
1000
fIF = 70MHz
800
600
fIF = 400MHz
400
fIF = 280MHz
200
–85
–70 –55 –40 –25 –10
IF INPUT POWER (dBm)
5
5502 G04
RSSI Output Voltage vs VCC
1.2
fIF = 280MHz
TA = 25°C
1.0
0.8
0.6
VCC = 5.5V
0.4
VCC = 1.8V
VCC = 3V
RSSI Output vs Temperature
1.2
VCC = 3V
fIF = 280MHz
1.0
0.8
0.6 TA = –40°C
0.4
TA = 85°C
TA = 25°C
0.2
–85
–70 –55 –40 –25 –10
IF INPUT POWER (dBm)
5
5502 G05
IF Input Sensitivity
vs Temperature
–73
fIF = 280MHz
–75
–77
TA = 25°C
–79
–81
TA = 85°C
TA = –40°C
RSSI Output Voltage vs IF Frequency
1.2
VCC = 3V
TA = 25°C
1.0
fIF = 280MHz
0.8
fIF = 70MHz
0.6
0.4
fIF = 400MHz
0.2
–85
–70 –55 –40 –25 –10
IF INPUT POWER (dBm)
5
5502 G06
IF Input Sensitivity vs IF Frequency
–73
VCC = 3V
–76
TA = 85°C
–79
TA = 25°C
TA = –40°C
–82
0.2
–85
–70 –55 –40 –25 –10
IF INPUT POWER (dBm)
5
5502 G07
LPF Frequency Response
vs Baseband Frequency
5
VCC = 3V
0
TA = 85°C
–5
–10 TA = 25°C
–15
–20
TA = –40°C
–25
–30
–35
0
4 8 12 16
BASEBAND FREQUENCY (MHz)
20
5502 G10
–83
1.8
2.5 3.5 4.5
SUPPLY VOLTAGE (V)
5.5
5502 G08
– 85
70 100
150 200 250 300
IF FREQUENCY (MHz)
350 400
5502 G09
LPF Group Delay
vs Baseband Frequency
110
VCC = 3V
TA = –40°C
95
TA = 85°C
80
65
50 TA = 25°C
35
20
0
4 8 12 16
BASEBAND FREQUENCY (MHz)
20
5502 G11
LPF Frequency Response vs VCC
5 110
VCC = 1.8V, 3V, 5.5V
0 TA = 25°C
–5 90
–10
–15 70
–20
–25 50
–30
–35
0
4 8 12 16
BASEBAND FREQUENCY (MHz)
30
20
5502 G12
4



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