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EW model
-FM/AM Tuner Unit
A
| AM ANT | FMRF |
1 | ATT |
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7 6
WC | CE2 |
IC 3 EEPROM
5.0V
OSC
13 | 5 | 10 | 9 | 8 | 11 |
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ROM VDD |
| SL | DI | CK | CE1 | LDET |
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| DO | RDS CK | RDS DATA | RDS LOCK | ||||||
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| IC 5 |
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| 5V | ← 3.3V |
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LPF |
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21
RDS_HSLK
IC 2
Rch 24
B
FM ANT
3
ATT 
FMRF
RF adj
ANT adj
IC 1
3.3V
MIXER, IF AMP
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| T51 |
| CF52 |
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| CF51 |
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| AUDIOGND |
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| RFGND | OSCGND | DGND | NC | VCC |
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| 3.3V | 3.3V | ← 2.5V | 2.5V | |
| 2 | 12 | 15 | 22 | 16 | 4 | 17 |
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2.5V
DET, FM MPX,
RDS DECODER
Lch 23
C
No. | Symbol | I/O | Explain |
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1 | AMANT | I | AM antenna input | AM antenna input high impedance AMANT pin is connected with |
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| an all antenna by way of 4.7∝ H. (LAU type inductor) A series circuit |
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| including an inductor and a resistor is connected with RF ground for |
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| the countermeasure against the ham of power transmission line. |
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2 | RFGND |
| RF ground | Ground of antenna block |
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3 | FMANT | I | FM antenna input | Input of FM antenna 75Ω Surge |
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4 | VCC |
| power supply | The power supply for analog block. D.C 8.4V ± 0.3V |
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5 | SL | O | signal level | Output of FM/AM signals level |
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6 | CE2 | I | chip | Chip enable for EEPROM | ” Low” active |
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7 | WC | I | write control | You can write EEPROM, when EEPROM write control is “ Low” . |
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| Ordinary non connection |
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8 | CE1 | I | chip | Chip enable for AF•RF ” High” active |
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9 | CK | I | clock | Clock |
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10 | DI | I | data in | Data input |
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11 | LDET | O | lock detector | “ Low” active |
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12 | OSCGND |
| osc ground | Ground of oscillator block |
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13 | ROM_VDD |
| power supply | Power supply for EEPROM pin 13 is connected with a power supply of |
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| micro computer. |
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14 | DO | O | data out | Data output |
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15 | DGND |
| digital ground | Ground of digital block |
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16 | NC |
| non connection | Not used |
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17 | VDD_3.3 |
| power supply | The power supply for digital block. 3.3V ± 0.2V |
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18 | RDS_CK | O | RDS clock | Output of RDS clock(2.5V) |
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19 | RDS_DATA | O | RDS data | Output of RDS data(2.5V) |
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20 | RDS_LOCK | O | RDS lock | Output unit “ High” active(2.5V) (RDS_LOCK turns over by the |
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| external transistor. “ Low” active) |
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21 | RDS_HSLK | O | RDS high speed | Output unit “ High” active(2.5V)(RDS_HSLK turns over by the |
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| lock | external transistor. “ Low” | active) |
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22 | AUDIOGND |
| audio ground | Ground of audio block |
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23 | L ch | O | L channel output | FM stereo “ |
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24 | R ch | O | R channel output | FM stereo “ |
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D
E
F
5 |
| 6 |
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| 8 |
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