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參數(shù)資料
| 型號(hào)： | MC13122 |
| 廠商： | Motorola, Inc. |
| 英文描述： | AMAX STEREO IC CHIPSET |
| 中文描述： | 中宇立體聲IC芯片組 |
| 文件頁數(shù)： | 23/28頁 |
| 文件大?。?/td> | 586K |
| 代理商： | MC13122 |
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MC13027 MC13122
AMAX STEREO CHIPSET
23
MOTOROLA ANALOG IC DEVICE DATA
The RF Module
In the early development phase of this AMAX Stereo
Chipset, Motorola worked with TOKO America Inc. to
develop an RF tuning module. Part number TMG522E was
assigned and is available from TOKO now. This module
provides the “tracked” tuning elements for the RF (T1 and T2
and associated capacitors and varicaps) and the VCO (T3 et
al). Some radio designers may prefer to develop their own
tuning system using discrete coils and components, but the
TOKO approach offers good performance, compactness and
ease of application. Motorola recommends that every
designer use this approach at least for initial system
development and evaluation.
As refinement of the application progressed, it was found
that a modification of the TMG522E was needed which would
reduce the amount of VCO leakage into the Mixer through the
power supply connections. This modification is described
below. Motorola will work with TOKO to develop a new part
number incorporating this change. In the meantime, it is
necessary that the user perform these simple changes,
because the radio circuits throughout this data sheet assume
this modified design.
Modifying the TMG522E
Referring to Figures 20 and 21, there are three simple
steps to the modification:
1. Cut the thin copper trace from Pin 2 to Pin 5 as shown.
2. Cut the thin copper trace from Pin 8 to the bottom of the
120
resistor. Removal of the resistor is optional.
3. Connect a wire from Pin 5 to the top of the 120
resistor
(or the upper pad for the resistor).
Figure 20. TMG522E Schematic
Figure 21. TMG522E Physical Modifications
Add Wire (3)
Cut (1)
Cut (2)
1
2
4
8
7
5
3
6
47 k
47 k
10 k
T1
T2
T3
120
3.9 k
Cut Trace (1)
X
X
Cut
Trace (2)
Add
Wire (3)
+B
Gnd
VT
RF Out
Osc
Low
Osc
High
5
3.0 V
RF In
TMG522E
8 7
6 5 4
3
2
1
TMG522E
Add Wire (3)
Cut (1)
Cut (2)
8
7
6
5
4
3
2
1
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