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LT5517EUF#PBF

P1-P3P4-P6P7-P9P10-P12
LT5517
10
5517f
Figure 7. I/Q Output Equivalent Circuit
APPLICATIO S I FOR ATIO
WUUU
15
16
V
CC
10pF
I
OUT
+
I
OUT
–
5517 F07
13
14
10pF
Q
OUT
+
Q
OUT
–
60Ω 60Ω 60Ω 60Ω
approach is to terminate each output with a shunt capaci-
tor. The capacitor value can be optimized depending upon
the operating frequency and the specific PCB layout.
The phase relationship between the I-channel output sig-
nal and the Q-channel output signal is fixed. When the LO
input frequency is higher than the RF input frequency, then
the Q-channel outputs (Q
OUT
+
, Q
OUT
–
) lead the I-channel
outputs (I
OUT
+
, I
OUT
–
) by 90°.
When the LO input frequency is lower than the RF input
frequency, then the Q-channel outputs lag the I-channel
outputs by 90°. Note that the phase relationship of the I-
and Q-channel outputs relative to the LO can vary by 180°,
depending on start-up conditions. This is the nature of a
frequency divider-based quadrature phase generator.
When AC output coupling is used, the resulting highpass
filter’s –3dB roll-off frequency is defined by the R-C
constant of the blocking capacitor and R
LOAD
, assuming
R
LOAD
> 600Ω.
Care should be taken when the demodulator’s outputs are
DC coupled to the external load to make sure that the I/Q
mixers are biased properly. If the current drain from the
outputs exceeds 6mA, there can be significant degrada-
tion of the linearity performance. Each output can sink no
more than 13mA when connected to an external load with
a DC voltage higher than V
CC
– 0.78V.
LT5517
11
5517f
UF Package
16-Lead Plastic QFN (4mm × 4mm)
(Reference LTC DWG # 05-08-1692)
U
PACKAGE DESCRIPTIO
4.00 ± 0.10
(4 SIDES)
NOTE:
1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WGGC)
2. ALL DIMENSIONS ARE IN MILLIMETERS
3. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
4. EXPOSED PAD SHALL BE SOLDER PLATED
PIN 1
TOP MARK
0.55 ± 0.20
1615
1
2
BOTTOM VIEW—EXPOSED PAD
2.15 ± 0.10
(4-SIDES)
0.75 ± 0.05
R = 0.115
TYP
0.30 ± 0.05
0.65 BSC
0.200 REF
0.00 – 0.05
(UF) QFN 0503
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
0.72 ±0.05
0.30 ±0.05
0.65 BSC
2.15 ± 0.05
(4 SIDES)
2.90 ± 0.05
4.35 ± 0.05
PACKAGE OUTLINE
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.
LT5517
12
5517f
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2004
LT/TP 0104 1K • PRINTED IN USA
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P1-P3P4-P6P7-P9P10-P12

LT5517EUF#PBF

Mfr. #:
Buy LT5517EUF#PBF
Manufacturer:
Analog Devices Inc.
Description:
Modulator / Demodulator 40MHz - 900MHz Quadrature Demodulator
Lifecycle:
New from this manufacturer.
Delivery:
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