Silicon Laboratories SI4734/35-B20 Product Manual
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Silicon Laboratories SI4734/35-B20 Product Manual

Broadcast am/fm/sw/lw radio receiver
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B
ROADCAST
Features
Worldwide FM band support
(64–108 MHz)
Worldwide AM band support
(520–1710 kHz)
SW band support (2.3–21.85 MHz)
LW band support (153–279 KHz)
Excellent real-world performance
Freq synthesizer with integrated VCO
Automatic frequency control (AFC)
Automatic gain control (AGC)
Integrated LDO regulator
Digital FM stereo decoder
Programmable de-emphasis
Adaptive noise suppression
AM/FM/SW/LW digital tuning
Applications
Table and portable radios
Stereos
Mini/micro systems
CD/DVD players
Portable media players
Boom boxes
Description
The Si4734/35 is the first digital CMOS AM/FM/SW/LW radio receiver IC that
integrates the complete tuner function from antenna input to audio output.
Functional Block Diagram
FM / SW
ANT
FMI
AM / LW
AMI
ANT
RFGND
2.7 - 5.5 V
VDD
GND
Rev. 1.0 4/08
AM/FM/SW/LW R
No manual alignment necessary
Adjustable channel filters
EN55020 complaint
Programmable reference clock
Digital volume control
Adjustable soft mute control
RDS/RBDS processor (Si4735 only)
Optional digital audio out (Si4735 only)
2-wire and 3-wire control interface
2.7 to 5.5 V supply voltage
Wide range of ferrite loop sticks and air
loop antennas supported
3 x 3 x 0.55 mm 20-pin QFN package
Pb-free/RoHS compliant
Cellular handsets
Modules
Clock radios
Mini HiFi
Entertainment systems
Si4734/35
RDS
LNA
(Si4735)
LOW-IF
AGC
ADC
LNA
DSP
ADC
AGC
CONTROL
LDO
AFC
INTERFACE
Copyright © 2008 by Silicon Laboratories
S i 4 7 3 4 / 3 5 - B 2 0
R
ADIO
DOUT
DIGITAL
AUDIO
DFS
(Si4735)
GPO/DCLK
DAC
ROUT
DAC
LOUT
VIO
1.5-3.6V
ECEIVER
Ordering Information:
See page 31.
Pin Assignments
Si4734/35-GM
(Top View)
20
19
18
17
NC
1
FMI
2
RFGND
3
GND
PAD
AMI
4
RST
5
6
7
8
9
10
Patents pending
Notes:
1. To ensure proper operation and
receiver performance, follow the
guidelines in "AN383: Antenna
Selection and Universal Layout
Guide." Silicon Laboratories will
evaluate schematics and layouts for
qualified customers.
2. Place Si4734/35 as close as
possible to antenna jack and keep
the FMI and AMI traces as short as
possible.
Si4734/35-B20
16
15 DOUT
14
LOUT
13
ROUT
12
GND
11
VDD

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Summary of Contents for Silicon Laboratories SI4734/35-B20

  • Page 1 CD/DVD players Portable media players Boom boxes Description The Si4734/35 is the first digital CMOS AM/FM/SW/LW radio receiver IC that integrates the complete tuner function from antenna input to audio output. Functional Block Diagram FM / SW AM / LW RFGND 2.7 - 5.5 V...
  • Page 2 Si4734/35-B20 Rev. 1.0...

  • Page 3: Table Of Contents

    Contact Information ............38 Si4734/35-B20 Rev.

  • Page 4: Electrical Specifications

    Si4734/35-B20 1. Electrical Specifications Table 1. Recommended Operating Conditions Parameter Supply Voltage Interface Supply Voltage Power Supply Powerup Rise Time Interface Power Supply Powerup Rise Time Ambient Temperature Note: All minimum and maximum specifications are guaranteed and apply across the recommended operating conditions.
  • Page 5 Analog Output Mode Digital Output Mode DDPD SCLK, RCLK inactive IOPD = 3.6 V = 0 V, = 3.6 V = 500 µA = –500 µA Rev. 1.0 Si4734/35-B20 — 19.2 — 19.8 — 19.9 — 18.0 20.5 — 17.3 20.5...
  • Page 6 Si4734/35-B20 Table 4. Reset Timing Characteristics = 2.7 to 5.5 V, V = 1.5 to 3.6 V, T Parameter RST Pulse Width and GPO1, GPO2/INT Setup to RST↑ GPO1, GPO2/INT Hold from RST↑ Important Notes: 1. When selecting 2-wire mode, the user must ensure that a 2-wire start condition (falling edge of SDIO while SCLK is high) does not occur within 300 ns before the rising edge of RST.
  • Page 7 HIGH SU:STA HD:STA SU:DAT HD:DAT SU:STO f:OUT f:IN r:IN threshold of SCLK to comply with the minimum = 400 kHz. At frequencies below 400 KHz, t Rev. 1.0 Si4734/35-B20 Unit — — — — — — — — — —...
  • Page 8 Si4734/35-B20 SU:STA HD:STA SCLK SDIO START r:IN Figure 2. 2-Wire Control Interface Read and Write Timing Parameters SCLK A6-A0, SDIO START ADDRESS + R/W Figure 3. 2-Wire Control Interface Read and Write Timing Diagram HIGH r:IN f:IN HD:DAT SU:DAT D7-D0 DATA Rev.
  • Page 9 HSEN Read Read HSDIO HIGH A6-A5, R/W, A4-A1 Address In HSDIO A6-A5, R/W, A4-A1 ½ Cycle Bus Address In Turnaround Rev. 1.0 Si4734/35-B20 Unit — — — — — — — — — — — — — — — HSEN...
  • Page 10 Si4734/35-B20 Table 7. SPI Control Interface Characteristics = 2.7 to 5.5 V, V = 1.5 to 3.6 V, T Parameter SCLK Frequency SCLK High Time SCLK Low Time SDIO Input, SEN to SCLK↑ Setup SDIO Input to SCLK↑ Hold ↓...
  • Page 11 DOUT Propagation Delay from DCLK Falling Edge DCLK DOUT Figure 8. Digital Audio Interface Timing Parameters, I = –20 to 85 °C) Symbol Test Condition SU:DFS HD:DFS PD:DOUT HD:DFS PD:OUT Rev. 1.0 Si4734/35-B20 — 1000 — — — — — — — — — SU:DFS...
  • Page 12 1. Additional testing information is available in Application Note AN388. Volume = maximum for all tests. Tested at RF = 98.1 MHz. 2. To ensure proper operation and receiver performance, follow the guidelines in “AN383: Antenna Selection and Universal Layout Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers. µ 3. F = 1 kHz, 75 s de-emphasis, MONO = enabled, and L = R unless noted otherwise.
  • Page 13 1. Additional testing information is available in Application Note AN388. Volume = maximum for all tests. Tested at RF = 98.1 MHz. 2. To ensure proper operation and receiver performance, follow the guidelines in “AN383: Antenna Selection and Universal Layout Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers. µ 3. F = 1 kHz, 75 s de-emphasis, MONO = enabled, and L = R unless noted otherwise.
  • Page 14 RSSI Offset Notes: 1. To ensure proper operation and receiver performance, follow the guidelines in “AN383: Antenna Selection and Universal Layout Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers. Tested at RF = 98.1 MHz. µ 2. F = 1 kHz, 75 s de-emphasis, MONO = enabled, and L = R unless noted otherwise.
  • Page 15 1. To ensure proper operation and receiver performance, follow the guidelines in “AN383: Antenna Selection and Universal Layout Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers. 2. FMOD = 1 kHz, 30% modulation, A-weighted, 2 kHz channel filter.
  • Page 16 Si4734/35-B20 Table 12. Reference Clock and Crystal Characteristics = 2.7 to 5.5 V, V = 1.5 to 3.6 V, T Parameter RCLK Supported Frequencies RCLK Frequency Tolerance REFCLK_PRESCALE REFCLK Crystal Oscillator Frequency Crystal Frequency Tolerance* Board Capacitance *Note: The Si4734/35 divides the RCLK input by REFCLK_PRESCALE to obtain REFCLK. There are some RCLK frequencies between 31.130 kHz and 40 MHz that are not supported.

  • Page 17: Typical Application Schematic

    4. To ensure proper operation and receiver performance, follow the guidelines in “AN383: Antenna Selection and Universal Layout Guide.” Silicon Laboratories will evaluate schematics and layouts for qualified customers. 5. Pin 2 connects to the FM antenna interface, and pin 4 connects to the AM antenna interface.

  • Page 18: Bill Of Materials

    Si4734/35-B20 3. Bill of Materials Component(s) Supply bypass capacitor, 22 nF, ±20%, Z5U/X7R Capacitor, 18 pF, ±20%, Z5U/X7R Coupling capacitor, 0.47 µF, ±20%, Z5U/X7R Ferrite loop stick, 180 4.7 µH Si4734/35 AM/FM Radio Tuner C2, C3 Crystal load capacitors, 22 pF, ±5%, COG (Optional: for crystal oscillator option) 32.768 kHz crystal (Optional: for crystal oscillator option)

  • Page 19: Functional Description

    AM/FM/SW/LW solutions. Leveraging Silicon Laboratories' proven and patented Si4700/01 FM tuner's digital low intermediate frequency (low-IF) receiver architecture, the Si4734/35 delivers superior RF performance and interference rejection in AM, FM, and short wave and long wave bands.

  • Page 20: Operating Modes

    Si4734/35-B20 4.2. Operating Modes The Si4734/35 operates in either an FM receive or an AM/SW/LW receive mode. In FM mode, radio signals are received on FMI (pin 2) and processed by the FM front-end circuitry. In AM/SW/LW mode, radio signals are received on AMI (pin 4) and processed by the AM front-end circuitry.

  • Page 21: Digital Audio Interface (Si4735 Only)

    4.7.2. Audio Sample Rates The device supports a number of industry-standard sampling rates including 32, 40, 44.1, and 48 kHz. The digital audio interface enables low-power operation by eliminating the need for redundant DACs on the audio baseband processor. Si4734/35-B20 Rev. 1.0...
  • Page 22 Si4734/35-B20 INVERTED (OFALL = 1) DCLK (OFALL = 0) DCLK (OMODE = 0000) 1 DCLK DOUT INVERTED (OFALL = 1) DCLK (OFALL = 0) DCLK Left-Justified (OMODE = 0110) DOUT Figure 11. Left-Justified Digital Audio Format (OFALL = 0) DCLK...

  • Page 23: Stereo Audio Processing

    *Note: RDS/RBDS is referred to only as RDS throughout the remainder of this document. Rev. 1.0 Si4734/35-B20 block synchronization, error errors indicates that errors, that block...

  • Page 24: Tuning

    Si4734/35-B20 4.13. Tuning The frequency synthesizer uses Silicon Laboratories’ proven technology, including a completely integrated VCO. frequency synthesizer quadrature local oscillator signal used to downconvert the RF input to a low intermediate frequency. The VCO frequency is locked to the reference clock and adjusted with an automatic frequency control (AFC) servo loop during reception.
  • Page 25 SCLK. Keep SEN low until all bytes have transferred. A transaction may be aborted at any time by setting SEN high and toggling SCLK high and then low. Commands Rev. 1.0 Si4734/35-B20...

  • Page 26: Gpo Outputs

    The Si4734/35 contains on-chip program RAM to accommodate minor changes to the firmware. This allows Silicon Labs to provide future firmware updates to optimize the characteristics of new radio designs and those already deployed in the field. 4.19. Reset, Power Up, and Power Down...

  • Page 27: Commands And Properties

    Begins searching for a valid AM or SW/LW frequency depending on the AM_SEEK_BAND_BOTTOM and AM_SEEK_BAND_TOP settings. Queries the status of the already issued AM_TUNE_FREQ or AM_SEEK_START command. Queries the status of the RSQ for the current channel. Configures GPO pins. Sets the value of the GPO pins. Rev. 1.0 Si4734/35-B20...
  • Page 28 Si4734/35-B20 Prop Name 0x0001 GPO_IEN 0x0102 DIGITAL_OUTPUT_FORMAT Configures the digital output format (Si4735 only). DIGITAL_OUTPUT_ 0x0104 SAMPLE_RATE 0x0201 REFCLK_FREQ 0x0202 REFCLK_PRESCALE 0x1100 FM_DEEMPHASIS FM_BLEND_STEREO_ 0x1105 THRESHOLD FM_BLEND_MONO_ 0x1106 THRESHOLD FM_MAX_TUNE_ 0x1108 ERROR FM_RSQ_INT_ 0x1200 SOURCE FM_RSQ_SNR_HI_ 0x1201 THRESHOLD FM_RSQ_SNR_LO_ 0x1202...
  • Page 29 RSSI threshold is not considered when doing a seek. Default value is 25 dBuV. Sets the output volume. Mutes the audio output. L and R audio outputs may be muted independently in FM mode. Rev. 1.0 Si4734/35-B20 Default 0x0000 0x0000 0x0003 0x0000...

  • Page 30: Pin Descriptions: Si4734/35-Gm

    Si4734/35-B20 6. Pin Descriptions: Si4734/35-GM RFGND Pin Number(s) Name 1, 20 No connect. Leave floating. FM RF inputs. RFGND RF ground. Connect to ground plane on PCB. AM/SW/LW RF input. Device reset (active low) input. Serial enable input (active low).

  • Page 31: Ordering Guide

    AM/FM/SW/LW Broadcast Radio Receiver with RDS/RBDS *Note: Add an “(R)” at the end of the device part number to denote tape and reel option; 2500 quantity per reel. Description Rev. 1.0 Si4734/35-B20 Package Operating Type Temperature –20 to 85 °C Pb-free –20 to 85 °C...

  • Page 32: Package Markings (Top Marks)

    Si4734/35-B20 8. Package Markings (Top Marks) 8.1. Si4734/35 Top Mark 3420 BTTT 8.2. Top Mark Explanation Mark Method: YAG Laser Line 1 Marking: Part Number Firmware Revision Line 2 Marking: Die Revision TTT = Internal Code Line 3 Marking: Circle = 0.5 mm Diameter...

  • Page 33: Package Outline: Si4734/35 Qfn

    1. All dimensions are shown in millimeters (mm) unless otherwise noted. 2. Dimensioning and tolerancing per ANSI Y14.5M-1994. Table 16. Package Dimensions Symbol 0.60 0.05 0.30 0.37 1.75 1.75 Rev. 1.0 Si4734/35-B20 Millimeters 2.53 BSC 0.35 0.40 0.45 0.00 — 0.10 — —...

  • Page 34: Pcb Land Pattern: Si4734/35 Qfn

    Si4734/35-B20 10. PCB Land Pattern: Si4734/35 QFN Figure 15 illustrates the PCB land pattern details for the Si4734/35-GM. Table 17 lists the values for the dimensions shown in the illustration. Figure 15. PCB Land Pattern Rev. 1.0...
  • Page 35 70% solder paste coverage on the pad, which is optimum to assure correct component stand-off. Notes: Card Assembly 1. A No-Clean, Type-3 solder paste is recommended. 2. The recommended card reflow profile is per the JEDEC/IPC J-STD-020C specification for Small Body Components. Si4734/35-B20 Symbol Millimeters 2.10 — —...

  • Page 36: Additional Reference Resources

    Si4734/35-B20 11. Additional Reference Resources EN55020 Compliance Test Certificate AN231: Si4700/01 Headphone and Antenna Interface AN332: Universal Programming Guide AN383: Antenna Selection and Universal Layout Guidelines AN386: Si473x Ferrite Loop Stick Antenna Interface AN388: Universal Evaluation Board Test Procedure AN389: Si473x EVB Quick-Start Guide Si47xx Customer Support Site: http://www.mysilabs.com...

  • Page 37: Document Change List

    ,” on page 14. Updated Table 12, “Reference Clock and Crystal Characteristics,” on page 16. Updated "2. Typical Application Schematic" on page Updated "3. Bill of Materials" on page 18. Updated "11. Additional Reference Resources" on page 36. Si4734/35-B20 ,” Rev. 1.0...

  • Page 38: Contact Information

    Silicon Laboratories products are not designed, intended, or authorized for use in applications intended to support or sustain life, or for any other application in which the failure of the Silicon Laboratories product could create a situation where per- sonal injury or death may occur.

This manual is also suitable for:

Si4734-b20Si4735-b20

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