Dsa Hi 000125491
Dsa Hi 000125491
Dsa Hi 000125491
B R O A D C A S T M E C H A N I C A L TU N I N G A M / F M / S W R A D I O R EC EIVER
Features
Worldwide FM band support Station and stereo LED indicators
(64–109 MHz) China TV channels audio carrier
Worldwide AM band support reception in FM band
(504–1750 kHz) Automatic frequency control (AFC)
SW band support Integrated LDO regulator
(2.3–28.5 MHz) 2.0 to 3.6 V supply voltage
No manual alignment necessary Wide range of ferrite loop sticks and
Stereo audio output air loop antennas supported
Selectable support AM/FM/SW 16-pin SOIC
regional bands Ordering Information:
RoHS-compliant
Enhanced FM/SW band coverage See page 14.
Bass/Treble control
EN55020 compliant
ADC
XTALI AFC CONTROL INTERFACE
BAND
2.0~3.6V VDD
XTAL
REG
OSC
Tone
Stereo
Station
RST
Section Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2. FM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
4.3. AM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
4.4. SW Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.5. Frequency Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.6. Band Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
4.7. Bass and Treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
5. Pin Descriptions: Si4836-A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7. Package Outline: Si4836-A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8. PCB Land Pattern: Si4836-A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9. Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9.1. Si4836-A10 Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
9.2. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
10. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Table 2. DC Characteristics
(VDD = 2.7 to 3.6 V, TA = –15 to 85 °C)
tSRST
70%
RST
30%
AM Suppression4,5,6,7 m = 0.3 — 50 — dB
Input IP34,8 — 105 — dBµV EMF
Adjacent Channel Selectivity4 ±200 kHz — 50 — dB
Alternate Channel Selectivity4 ±400 kHz — 65 — dB
Audio S/N3,4,6 — 55 — dB
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Notes:
1. Place C4 close to VDD and GND pins.
2. Pin 15 GND connects directly to GND plane on PCB.
3. Pin 5 leave floating.
4. To ensure proper operation and receiver performance, follow the guidelines in "AN738: Si4825/36-A Antenna,
Schematic, Layout, and Design Guidelines." Silicon Labs will evaluate the schematics and layouts for qualified
customers.
5. Pin 6 connects to the FM antenna interface and pin 8 connects to the AM antenna interface.
6. Place Si4836 as close as possible to antenna jack and keep the FMI and AMI traces as short as possible.
7. Recommend keeping the AM ferrite loop antenna at least 5 cm away from the tuner chip.
8. Keep the AM ferrite loop antenna at least 5 cm away from MCU, audio AMP, and other circuits which have AM
interference.
9. Place the transformer T1 away from any sources of interference and even away from the I/O signals of the Si4836.
Si4836
ADC
XTALI AFC CONTROL INTERFACE
BAND
2.0~3.6V VDD
XTAL
REG
OSC
Tone
Stereo
Station
RST
Figure 2. Si4836 Functional Block Diagram
4.1. Overview 4.2. FM Receiver
The Si4836 is the high performance mechanical-tuned The Si4836 integrates a low noise amplifier (LNA)
digital CMOS AM/FM/SW radio receiver IC that supporting the worldwide FM broadcast band (64 to
integrates the complete receiver function from antenna 109 MHz) and the TV audio stations within the
input to audio output. The Si4836 extends Silicon frequency range in China area are also supported.
Laboratories multi-band tuner family, and further Pre-emphasis and de-emphasis is a technique used by
increases the ease and attractiveness of design radio FM broadcasters to improve the signal-to-noise ratio of
reception to audio devices through small size and board FM receivers by reducing the effects of high frequency
area, minimum component count, and superior, proven interference and noise. When the FM signal is
performance. The Si4836 enhances the FM and SW transmitted, a pre-emphasis filter is applied to
band coverage and further supports China TV channels accentuate the high audio frequencies. All FM receivers
audio reception in FM band. The Si4836 removes any incorporate a de-emphasis filter which attenuates high
requirements for manually tuning components during frequencies to restore a flat frequency response. Two
the manufacturing process. time constants are used in various regions. The de-
Leveraging Silicon Laboratories' proven and patented emphasis time constant can be chosen to be 50 or
digital low intermediate frequency (low-IF) receiver 75 µs. Refer to "AN738: Si4825/36-A Antenna,
architecture, the Si4836 delivers desired RF Schematic, Layout, and Design Guidelines.”
performance and interference rejection in AM, FM, and The Si4836 also has advanced stereo blending that
SW bands. The high integration and complete system employs adaptive noise suppression. As a signal quality
production test simplifies design-in, increases system degrades, the Si4836 gradually combines the stereo left
quality, and improves manufacturability. and right audio channels to a mono audio signal to
maintain optimum sound fidelity under varying reception
conditions. The Si4836 can drive a stereo light with the
stereo/mono information so that the user can easily
LOUT 1 16 ROUT
TUNE1 2 15 GND
TUNE2 3 14 VDD
BAND 4 13 XTALI
NC 5 12 XTALO
FMI 6 11 STATION
RFGND 7 10 STEREO/LNA_EN
AMI 8 9 RST
Patent Notice
Silicon Labs invests in research and development to help our customers differentiate in the market with innovative low-power, small size, analog-
intensive mixed-signal solutions. Silicon Labs' extensive patent portfolio is a testament to our unique approach and world-class engineering team.
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