LA7790M 데이터 시트보기 (PDF) - SANYO -> Panasonic
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LA7790M Datasheet PDF : 14 Pages
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LA7790M
1. Modulator
The modulator consists of two identical multiplier circuits, creating I and Q channels. Pins 4 & 5 and pins 8 & 9 are I
and Q channel inputs, respectively. These pins must be biased at 2.1 ± 0.2 V. Pin 6 is an internal 2.1 V bias. This
internal bias can be used if the I & Q data inputs are AC coupled, but an external bias must be used in the case of DC
coupled data inputs. Carrier suppression is improved if the offset voltages between pins 4 & 5 and pins 8 & 9 are
small.
(1) AC coupled application
+
I input
Q input
+
4
5
6
2.1 V
8
9
(2) DC coupled application
I input
+
4
+
2.1 V
5
6
Q input
+
8
2.1 V
+
9
No. 5689-8/14
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