Final Electrical Specifications
LT5502
400MHz Quadrature
IF Demodulator with RSSI
January 2001
FEATURES
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Single 1.8V to 5.25V Supply
IF Frequency Range: 70MHz to 400MHz
84dB Limiting IF Gain
90dB Linear RSSI Range
7.7MHz Lowpass Output Filter
Baseband I/Q Amplitude Imbalance: <0.7dB
4dB Noise Figure
Low Supply Current: 25mA
Outputs Biased Up While in Standby
Shutdown Current: 1碌A(chǔ)
24-Lead Narrow SSOP Package
APPLICATIO S
s
s
s
IEEE802.11
High Speed Wireless LAN
Wireless Local Loop
The LT
廬
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/鈭欻z, which is equivalent to a 4dB noise figure
when the input is terminated with a 50鈩?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.
TYPICAL APPLICATIO
I/Q Output Swing, RSSI Output vs IF Input Power
2V
C2
1碌F
C3
22nF
IF
INPUT
R1
240鈩?/div>
IF
+
IF
鈥?/div>
2XLO
+
2XLO
INPUT
2XLO
鈥?/div>
LT5502
ENABLE
EN
GND
梅2
0擄
C1
1nF
1200
1.2
DIFFERENTIAL OUTPUT SWING (mV
P-P
)
V
CC
1000
I
OUT+
90擄
I
OUT鈥?/div>
Q
OUT+
Q
OUT鈥?/div>
RSSI
C4
1.8pF
BASEBAND
DIFFERENTIAL
I/Q OUTPUTS
800
600
400
200
鈥?5
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.
U
1.0
U
U
RSSI OUTPUT (V)
0.8
0.6
0.4
0.2
鈥?0
鈥?5
鈥?0
鈥?5
鈥?0
IF INPUT POWER (dBm)
5
5502 TA01b
1
LT5502EGN 產(chǎn)品屬性
LT5502
55
RF/IF 和 RFID
RF 解調(diào)器
-
解調(diào)器
140MHz ~ 800MHz
70MHz ~ 400MHz
-
-
4dB
32mA
1.8 V ~ 5.25 V
24-SSOP（0.154"，3.90mm 寬）
24-SSOP
管件
LT5502EGN相關(guān)型號PDF文件下載
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型號
版本
描述
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