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LTC5505 Datasheet

  • LTC5505

  • Linear Technology [40MHz to 900MHz Quadrature Demodulator]

  • LINER

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LT5517
APPLICATIO S I FOR ATIO
Table 2. RF Input Differential Impedance
FREQUENCY
(MHz)
40
100
200
300
400
500
600
700
800
900
DIFFERENTIAL INPUT
IMPEDANCE (鈩?
240.1-j10.3
245.5-j25.9
236.8-j50.0
223.6-j70.5
207.9-j86.3
190.6-j98.1
173.2-j105.8
156.2-j110.2
141.2-j111.8
129.5-j114.5
MAG
0.665
0.664
0.664
0.663
0.662
0.660
0.657
0.655
0.651
0.650
DIFFERENTIAL S11
ANGLE(擄)
鈥?.8
鈥?.5
鈥?.1
鈥?.6
鈥?0.2
鈥?2.7
鈥?5.3
鈥?7.9
鈥?0.4
鈥?2.9
2XLO Input Port
To ease the interface of the receiver with the external 2XLO
input, the 2XLO port is designed with on-chip 50鈩?imped-
ance matching up to 2GHz. The input is internally biased
at 1V. A 1nF DC blocking capacitor is required when
connected to the external 2XLO source.
The 2XLO frequency is required to be twice the desired
operating frequency in order for the chip to generate the
J1
RF
5
C10
3.3pF
4
Figure 6. RF Input Equivalent Circuit with External Broadband Matching
U
quadrature Local Oscillator (LO) signals for the demodu-
lator. The on-chip divide-by-two circuit delivers well-
matched, quadrature LO carriers to the I mixer and the Q
mixer.
I-Channel and Q-Channel Outputs
Each of the I-channel and Q-channel outputs is internally
connected to V
CC
though a 60鈩?resistor. The output DC
bias voltage is V
CC
鈥?0.78V. The outputs can be DC coupled
or AC coupled to the external loads. The differential output
impedance of the demodulator is 120鈩?in parallel with a
10pF internal capacitor, forming a lowpass filter with a
鈥?dB corner frequency at 130MHz. The load impedance,
R
LOAD
, should be larger than 600鈩?to assure full gain. The
gain is reduced by 20 鈥?log(1 + 120鈩?R
LOAD
) in dB when
the differential output is terminated by R
LOAD
. For ex-
ample, the gain is reduced by 6.85dB when each output pin
is connected to a 50鈩?load (or 100鈩?differential loads).
The output should be taken differentially (or by using
differential-to-single-ended conversion) for best RF per-
formance, including NF and IM2. Proper filtering of the
unwanted high frequency mixing product is also impor-
tant to maintain the highest linearity. A convenient
LT5517
V
CC
T1
MABAES0054
1
2
3
C2
1nF
RF
鈥?/div>
2.30V
C1
1nF
2
RF
+
250鈩?/div>
3
5517 F06
W
U U
5517f
9

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