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PDF LT5502 Data sheet ( Hoja de datos )
| Número de pieza | LT5502 | |
| Descripción | 400MHz Quadrature IF Demodulator with RSSI | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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 50Ω source. 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
240Ω
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
1 page  
LT5502
PI FU CTIO S
IOUT+ (Pin 1): Positive Baseband Output Pin of I-Channel.
The DC bias voltage is VCC – 1.16V. This pin should not be
shorted to ground.
IOUT– (Pin 2): Negative Baseband Input Pin of I-Channel.
The DC bias voltage is VCC – 1.16V. This pin should not be
shorted to ground.
GND (Pins 3, 5, 8, 9, 14, 20, 21): Ground Pin.
VCC (Pins 4, 16, 17, 22): Power Supply Pin. This pin
should be decoupled using 1000pF and 0.1µF capacitors.
IF+ (Pin 6): Positive IF Input Pin. The DC bias voltage is
VCC – 0.4V.
IF– (Pin 7): Negative IF Input Pin. The DC bias voltage is
VCC – 0.4V.
EN (Pin 10): Enable Pin. When the input voltage is higher
than 0.9V or up to VCC, the circuit is completely turned on.
When the input voltage is less than 0.7V or down to
ground, the circuit is turned off except the part of the
circuit associated with standby mode.
STBY (Pin 11): Standby Pin. When the input voltage is
higher than 0.9V or up to VCC, the circuit of standby mode
is turned on to bias the I/Q buffers to desired quiescent
voltage. When the input voltage is less than 0.7V or down
to ground, it is turned off.
IFt+ (Pin 12): Interstage IF Positive Pin. The DC bias
voltage is VCC – 0.25V.
IFt– (Pin 13): Interstage IF Negative Pin. The DC bias
voltage is VCC – 0.25V.
RSSI (Pin 15): RSSI Output Pin.
2XLO– (Pin 18): Negative Carrier Input Pin. The input-
signal’s frequency must be twice that of the desired
demodulator LO frequency. The DC bias voltage is VCC –
0.4V.
2XLO+ (Pin 19): Positive Carrier Input Pin. The input-
signal’s frequency must be twice that of the desired
demodulator LO frequency. The DC bias voltage is VCC –
0.4V.
QOUT– (Pin 23): Negative Baseband Output Pin of the
Q-Channel. The DC bias voltage is VCC – 1.16V. This pin
should not be shorted to ground.
QOUT+ (Pin 24): Positive Baseband Output Pin of the
Q-Channel. The DC bias voltage is VCC – 1.16V. This pin
should not be shorted to ground.
BLOCK DIAGRA
IFt+ IFt–
12 13
IF+ 6
IF– 7
LIMITER
1
LIMITER
2
RSSI
15
RSSI
I-MIXER
LPF
1
LO
BUFFERS
DIVIDE 2
0°/90°
LPF
1
Q-MIXER
BIAS
19 18
2XLO+ 2XLO–
10
EN
1 IOUT+
2 IOUT–
24 QOUT+
23 QOUT–
5502 BD
5
5 Page 
PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.
LT5502
GN Package
24-Lead Plastic SSOP (Narrow 0.150)
(LTC DWG # 05-08-1641)
0.337 – 0.344*
(8.560 – 8.738)
24 23 22 21 20 19 18 17 16 15 1413
0.033
(0.838)
REF
0.229 – 0.244
(5.817 – 6.198)
0.150 – 0.157**
(3.810 – 3.988)
1 2 3 4 5 6 7 8 9 10 11 12
0.007 – 0.0098
(0.178 – 0.249)
0.015
(0.38
±
±
0.004
0.10)
×
45°
0° – 8° TYP
0.016 – 0.050
(0.406 – 1.270)
* DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.053 – 0.068
(1.351 – 1.727)
0.008 – 0.012
(0.203 – 0.305)
0.004 – 0.0098
(0.102 – 0.249)
0.0250
(0.635)
BSC
GN24 (SSOP) 1098
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT5502.PDF ] | |
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