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Stereo FM Receiver Radio-on-a-ChipTM
KT0830E
Features
Low-cost true single-chip FM radio solution Single-Chip Low IF FM Receiver Direct band, volume, frequency selection Digital FM Demodulator Digital Stereo Processor Low-noise PLL with integrated VCO Extended FM band support (64-109MHz) Integrated Class AB headphone driver High Fidelity SNR: 64dB THD: <0.3% High Sensitivity: -106dBm Low supply current 19.5mA (operating), <20uA (standby) High Driving capability Drive up to 16 ohm load (single-sided) 32.768kHz reference clock/crystal Automatic Frequency Control (AFC) Automatic gain control (AGC) Anti-pop circuit 16-pin SOP package
Figure 1: System Diagram
Description
The KT0830E is a high-quality Monolithic Digital FM Receiver designed to playback high-fidelity FM broadcasting signals under various conditions. The KT0830E offers a true single-chip FM radio solution. There are no external filters or frequency-tuning devices thanks to a proprietary digital low-IF architecture, a fullyintegrated LNA, automatic gain control (AGC), highperformance ADCs, high-quality analog and digital filters, and an on-chip low-noise self-tuning VCO. The on-chip highfidelity Class-AB driver further eliminates the need for any external audio amplifiers and can drive stereo headphones directly. The on-chip LDO regulator allows the chip to operate with power supply ranging from 1.8 V to 3.6V consuming merely 19mA in full operation mode and less than 20uA when standby - greatly extending the battery life. The small footprint, high integration level and great flexibility make KT0830E for any standalone FM radio applications.
Applications
Single chip FM radio used in PMP, boom box, sporting devices, medical devices and etc
Rev. 1.1
Information furnished by KT Micro is believed to be accurate and reliable. However, no responsibility is assumed by KT Micro for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of KT Micro, Inc.
KT Micro Inc., 22391 Gilberto, Suite D Rancho Santa Margarita, CA 92688 Tel: 949.713.4000 http://www.ktmicro.com.cn Fax: 949.713.4004 Copyright (c)2009, KT Micro, Inc.
KT0830E
1 Electrical specification
Table 1: FM Receiver Characteristics (Unless otherwise noted Tj = -20~110 oC, AVDD =2.0V to 3.6V) Parameter Symbol Test/Operating Min Typ Max Condition FM Frequency Range Frx 64 109 Sensitivity1,2,3 Sen (S+N)/N=26dB 2.2 3.5 Input referred 3rd Order IIP3 87 Intermodulation Production4,5 Adjacent Channel Selectivity 40 51 200KHz Alternate Channel Selectivity 50 70 400KHz Image Rejection Radio 35 AM suppression 50 RCLK frequency 32.768 RCLK frequency Tolerance -150 150 Audio Output Voltage1,2,3,4 32ohm load 68 70 72 Audio Band Limits1,2,4 30 15k 3dB Audio Stereo Separation 1,4,6 35 Audio Stereo S/N1,4,6,7 64 Audio THD1,2,4,6 0.3 Audio Common Mode Voltage 0.7 Audio Output Load Resistance RL Single-ended 16 Seek/Tune Time 50 (effective channel) Power-up Time 380 Notes: 1. FMOD=1kHz, 75us de-emphasis 2. MONO=1 3. F=22.5kHz 4. VEMF=1mV, Frx=70MHz~110MHz 5. AGCD=1 6. F=75kHz 7. VOLUME<3:0>=1111 Units MHz uVemf dBuVE MF dB dB dB dB kHz ppm mVRMS Hz dB dB % V ms/ch ms
Copyright (c)2009, KT Micro, Inc.
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KT0830E
2 Pin List
A 16-pin SOP package is used. The chip IO pin-out is listed in Table 2. Pin Index 1 2 Name AVDD CMODE Table 2 Pin-Out I/O Type Function Power Power supply Digital Input High: 5767 Mode (Register map compatible with TEA5767 and has the same feature set as TEA5767) Low: Full Functional Mode (Register map is self-defined and provides full set of features) Ground Ground Digital Input I2C clock input. Digital IO I2C data input/output Analog output Left channel output with 16 ohm driving capability. Analog output Right channel output with 16 ohm driving capability. Ground Ground Power 2.0V - 3.6V power supply. Analog IO 32.768KHz crystal input or 32.768KHz reference clock input Analog IO 32.768KHz crystal input Digital Input High for normal operating mode and low for standby mode. N.C. No Connection N.C. No Connection Analog Input RF signal input. External AC coupling cap is not required Ground Ground
3 4 5 6 7 8 9 10 11 12 13 14 15 16
GND SCLK SDIO LOUT ROUT GND AVDD XTALP XTALN POWER_ON N.C. N.C. RFINP GND
Figure 2: Pin out
Copyright (c)2009, KT Micro, Inc.
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Table 3: I/O Pin Configuration
PAD SCLK
Schematic
SDIO
RFINP
Copyright (c)2009, KT Micro, Inc.
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3 Functional Description
3.1 Overview
The KT0830E offers a true single-chip FM radio solution by virtually eliminating all the external components. There are no external filters or frequency-tuning devices thanks to a proprietary digital low-IF architecture, a fully-integrated LNA, automatic gain control (AGC), high-performance ADCs, high-quality analog and digital filters, and an on-chip low-noise self-tuning VCO. The on-chip high-fidelity Class-AB driver further eliminates the need for any external audio amplifiers and can drive stereo headphones directly.
3.2 FM Receiver
A high performance digital-IF structure receiver is used in KT0830E to convert RF signal to IF signal. The received IF signal is digitized by a high resolution analog to digital converter (ADC) and all the following signal processing including channel filtering, FM demodulation, stereo decoding is performed digitally. In order to improve the dynamic range of the RF signal, an automatic gain control (AGC) loop is used together with the low noise amplifier (LNA). KT0830E also provides configurations for various types of antenna such as short antenna, long antenna or headphone (audio wire) antenna through register ANTTYP<1:0>.
3.3 Digital Signal Processing
3.3.1 Stereo Decoder
The digitized IF signal is fed to the FM demodulator which demodulates the signal and outputs a digital multiplexed (MPX) signal consisting of L+R audio, L-R audio, 19kHz pilot tone. The left channel signal and the right channel signal can be extracted from the MPX signal by simply adding and subtracting the L+R signal and L-R signal. The spectrum diagram is shown in Figure 3.
Figure 3: Spectrum diagram of the MPX signal
Copyright (c)2009, KT Micro, Inc.
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3.3.2 Mute
KT0830E can be hard muted by setting MUTE_B to 0 and the output of the audio signal is set to the common mode voltage. There is also a Soft Mute feature that is enabled by setting SMUTE_B to 0. In this mode, the audio volume is gradually attenuated when the signal reception is bad (i.e. when the RSSI is below a certain level as defined by SMTH<1:0>.) The attenuation attack rate and depth can be configured through SMUTER<1:0> and SMUTEA<1:0>, respectively.
3.3.3 Stereo / Mono Blending
In order to provide a comfortable listening experience, KT0830E blends the stereo signal with mono signal gradually when in weak reception. The signal level range over which the blending occurs is set by BLNDADJ<1:0>. The blending is disabled when DBLND is set to 1. MONO playback mode can also be forced by setting the MONO to 1.
3.3.4 Bass Boosting
KT0830E provides a digital audio enhancement feature, bass boosting. The gain of the bass boost can be programmed through BASS<1:0> (Reg0x04<9:8>). With BASS<1:0>=00, this feature is disabled.
3.4 Stereo DAC, Audio Filter and Driver
Two high-quality single-bit audio digital to analog converters (DAC) are integrated along with high-fidelity analog audio filters and class AB drivers. Headphones and speakers with impedance as low as 16ohms can be directly driven without external audio drivers. An integrated anti-pop circuit eliminates the clickand-pop sound during power up and power down.
3.5 SEEK/TUNE
The fully integrated LO synthesizer supports wide band operation from 64MHz to 110MHz. The reference clock is 32.768 kHz with frequency tolerance of 100ppm. The chip begins to directly TUNE to a channel when the register TUNE is set to 1. The channel frequency can be programmed and tuned by setting CHAN<9:0> and can be defined as Freq(MHz) = 50 kHz x CHAN<9:0> + 64 MHz The SEEK process is started by setting SEEK to "1". The seek direction is determined by SEEKUP. The band edges are determined by BAND<1:0> and the seek step is set by SPACE<1:0>. KT0830E automatically seeks and tunes to the first satisfying station. The seeking criterion is set by SEEKTH<3:0>. If no qualified channel is found, the FM receiver returns to the original channel and SF/BL bit is set to "1". When AUTOTUNE bit is set to 1, the chip will automatically tune to the found channel, otherwise, the chip will remain mute after seek is completed. During the seeking, the current channel can be read out from READCH<9:0> bits.
Copyright (c)2009, KT Micro, Inc.
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3.6 Power on Sequence
KT0830E is powered up by pulling the POWER_ON pin to high. One needs to wait for 400ms before he/she can configure the chip through the serial interface.
4 Control Interface- I2C
I2C bus mode uses SCLK and SDIO to transfer data. The device always drives data to SDIO at the falling edge of SCLK and captures data from SDIO at the rising edge of SCLK. The device acknowledges the external controller by driving SDIO low at the falling edge of SCLK. Data transfer always begins with START condition and ends with STOP condition. The external controller can read/write one 16-bits data at the specified address or read/write desired number of registers data continuously from the specified address till when STOP condition is occurred. For write operations, external controller should send command & data in the following sequence: START condition -> 7 bit chip address and Write command ("0") -> 8 bit register address n -> write data n [15:8] -> write data n [7:0] -> write data n+1 [15:8] -> write data n+1 [7:0] -> ...... -> STOP condition. For read operations, external controller should send command & data in the following sequence: START condition -> 7 bit chip address and Write command ("0") -> 8 bit register address n -> 7 bit chip address and Read command ("1") , then device will send read data n [15:8] -> read data n [7:0] -> read data n+1 [15:8] -> read data n+1 [7:0] -> ...... till STOP condition.
Copyright (c)2009, KT Micro, Inc.
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KT0830E
Table 4 : I2C Interface Protocol
RANDOM REGISTER WRITE PROCEDURE S 0 1 1 x 1 1 1 WA A A AP 7 bit chip Register address write data [15:8] write data [7:0] address Acknowledge Acknowledg Acknowledge e START WRITE command STOP condition condition RANDOM REGISTER READ PROCEDURE S 0 1 1 x 1 1 1 WA 7 bit chip register address address START condition Acknowledge WRITE command AS 0 1 1 x 1 1 1 RA ... A ... AP 7 bit chip address read read data data [15:8] [7:0] Acknowledge Acknowledge READ command NO Acknowledge STOP condition Note: The data bits in gray color are sent by KT0830E
SDIO
CHIP ADDR
R/W
ACK
REG ADDR
ACK
DATA
ACK
SCLK S
1-7
8
9
1-7
8
9
1-7
8
9 P
Figure 4: I2C interface timing diagram
Copyright (c)2009, KT Micro, Inc.
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5 Register Map
Reg MFID<11:0> REV<5:0> SEEKTH<4:0> AUTOVOL AUTOTUN _EN SMUTER<1:0> DE ANTTYP<1:0> AFCRANGE<2:0> AFCD SEEKMD ST<1:0> RSSI<4:0> RDCHAN<9:0> AFC_DELTAF<5:0> STCIEN SF HLSI BLNDADJ<1:0> DBLND SMUTEA<1:0> BASS<1:0> SMTH<1:0> E CHAN<9>0> FM_BAND<1:0> SPACE<1:0>
Name
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6 D5 D4 D3 D2
D1
D0
00h DEVICE
PN<3:0>
01h CHIPID
02h SEEK
SEEK
SEEKDIR
03h TUNE
TUNE
04h VOLUME
SMUTE_B
MUTE_B
VOLUME<3:0>
05h DSPCFGA
MONO
09h RFCFG
0Ah LOCFGA
0Fh SYSCFG
SFTRST
Copyright (c)2009, KT Micro, Inc.
12h STATUSA
XTAL_OK
STC
13h STATUSB
14h STATUSC
KT0830E
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The register bank stores channel frequency codes, calibration parameters, operation status, mode and power controls, which can be accessed by the internal digital controller, state machines and external micro controllers through the serial interface. All registers are 16 bits wide. Control logics are active high unless specifically noted. All the registers are automatically set to default values after the chip is powered-on or reset.
5.1 Device ID Register (Reg 0x00)
Bit 15:12 11:0 Symbol PN<3:0> Access R Default Functional Description Part Number 1011=FM Receiver Manufacturer ID
MFGID<11:0> R
5.2 CHIP ID (Reg 0x01)
Bit 15:10 9 8:6 5:0 Symbol REV<5:0> Reserved Reserved Reserved Access R R R R Default Functional Description Reserved Reserved Reserved Reserved
5.3 Seek Configuration (Reg 0x02)
Bit 15 14 13:12 11:7 6 5:4 Symbol SEEK SEEKDIR Reserved SEEKTH<4:0> Reserved FM_Band<1:0> Access RW RW Default Functional Description 0 Seek enable 0 = Disable 1 = Enable 0 Seek direction 0 = Seek down 1 = Seek up 10 00110 Seek Threshold 00000 = most sensitive 11111 = least sensitive 0 00 Band Selection (For seek operation) 00 = 87-108MHz (USA, Europe) 01 = 76-108MHz (Japan wide band) 10 = 76-90MHz (Japan). 11 = reserved 00 Channel spacing 00 = 200KHz (US, Europe) 01 = 100KHz (Europe, Japan) 10 = 50KHz 11
RW
RW
3:2
SPACE<1:0>
RW
1:0
Reserved
Copyright (c)2009, KT Micro, Inc.
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KT0830E
5.4 TUNE Register (Reg 0x03)
Bit 15 14 13 12 Symbol Tune Reserved AUTOVOL_EN AUTOTUNE RW RW Access RW Default Functional Description 0 Tune Enable 0 = Disable 1 = Enable 0 0 1 Automatic Volume Control 1 = enable Automatic tune control 0 = Will NOT tune after a successful seek until a separated Tune command is received from the control interface 1 = Automatically starts Tune process after Seek Tune Channel Value
11:10 9:0
Reserved Chan<9:0> RW
10 1CC
5.5 VOLUME Control Register (Reg 0x04)
Bit 15 14 13:12 Symbol SMUTE_B MUTE_B SMUTER<1:0> Access RW RW RW Default Functional Description 1 Softmute Disable 0 = Softmute enable 1 = Softmute disable 0 Hard Mute Disable 0 = Mute enable 1 = Mute disable 00 Softmute Attack/Recover Rate 0 = Slow 01 = Slowest 10 = Fastest 11 = Fast 00 Softmute Attenuation 00 = Strong 01 = Strongest 10 = Weak 11 = Weakest 00 Bass boost effect mode selection 00 = Disable 01 = Low 10 = Med 11 = High 00
11:10
SMUTEA<1:0>
RW
9:8
BASS<1:0>
RW
7:6
Reserved
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KT0830E
5:4 SMTH<1:0> RW 10 Soft mute start level 00 = Highest 01 = High 10 = Low 11 = Lowest Volume Control 0000 = mute 0001 = -42dBFS 0010 = -39dBFS ...... ....... 1110 = -3dBFS 1111 = FS
3:0
VOLUME<3:0>
RW
0111
5.6 DSP Configuration Register A (Reg 0x05)
Bit 15 14:12 11 Symbol MONO Reserved DE Access RW Default Functional Description 0 Mono Select 0 = Stereo 1 = Force mono 101 0 De-emphasis 0 = 75us. Used in USA. 1 = 50us. Used in Europe, Australia, Japan. 0 10 Stereo/Mono Blend Start Level 00 = High 01 = Highest 10 = Lowest 11 = Low 0 0 Blend disable 0 = blend enable 1 = blend disable 0
RW
10 9:8
Reserved BLNDADJ<1:0>
RW
7:6 5 4:0
Reserved DBLND Reserved
RW
5.7 RF Configuration (Reg 0x09)
Bit 15:10 9:8 Symbol Reserved ANTTYP<1:0> Access RW Default 000001 01 Functional Description Antenna type selection 00 = Long antenna 01 = earphone/short antenna 10 = Reserved 11 = Reserved
7:0
Reserved
00000000 Copyright (c)2009, KT Micro, Inc. 12
KT0830E
5.8 LO Synthesizer Configuration A (Reg 0x0A)
Bit Symbol 15 Reserved 14:12 AFCRANGE<2:0> Access RW Default 0 000 Functional Description
AFC correction range 000 = 12KHz 001 = 15KHz 010 = 14KHz 011 = 17KHz 100 = 16KHz 101 = 19KHz 110 = 22KHz 111 = 25KHz AFC disable control bit 0 = AFC enable 1 = AFC disable
11:9 8 7 6 5:0
Reserved AFCD Reserved HLSI Reserved
RW
000 1 0 0 000000
RW
High side or low side injection 1 = high side injection 0 = low side injection
5.9 Misc Reg (Reg 0x0D)
Bit 15:1 0 Symbol Reserved Reserved Access Default 0x0 1 Functional Description
5.10 System Configuration Register (Reg 0x0F)
Bit 15 14 13 Symbol Reserved SFTRST STCIEN Access RW RW Default Functional Description 0 0 Soft reset bit 0 = normal operation 1 = soft reset 0 Seek/Tune Complete Interrupt Enable 0 = Disable Interrupt 1 = Enable Interrupt 01 0 Seek mode selection 0 = cycling seek 1 = stop at the band edge. 1 0
12:11 Reserved 10 SEEKMD 9 8:0 Reserved Reserved
RW
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KT0830E
5.11 Status Register A (Reg 0x12)
Bit 15: 14 Symbol Reserved STC Access R RW Default Functional Description 0 0 Seek/Tune Complete 0 = Not Complete 1 = Complete This bit can be cleared manually 0 Seek Fail 0 = Seek successful 1 = Seek failure 000 0 Stereo indicator 11 = Stereo Other= Mono 00000 RSSI value indicator RSSI indication range is from 100dBm to -7dBm with 3dB resolution, where 00000 means minimum level and 11111 means maximum level.
13
SF
R
12:10 Reserved 9:8 ST<1:0>
R
7:3
RSSI<4:0>
R
2:0
Reserved
0
5.12 Status Register B (Reg 0x13)
Bit 15:10 9:0 Symbol Reserved READCHAN<9:0> Access Default Functional Description 000000 R 0 The current Channel READCHAN<9:0> provides the current channel during seek or after a seek or tune operation is completed
5.13 Status Register C (Reg 0x14)
Bit 15:6 5:0 Symbol Reserved AFC_DELTAF<5:0> Access Default Functional Description R 0 R 000000 Frequency difference between CHAN and
received signal, calculated by AFC block in two's complement format. Range is 31 to +31. Unit is KHz. This register is valid when STC=1
Copyright (c)2009, KT Micro, Inc.
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KT0830E
6 Application circuit
AVDD CMODE GND SCLK SDIO
1 2
16 15
GND RFINP N.C N.C POWER_ON XTALN XTALP AVDD
KT0830E
3 4 5 6 7 8
14 13 12 11 10 9
C4
LOUT ROUT
C5
GND
External clock input From Battery
C3
XTALN
XTALP
C1
X1
C2
Optional : for crystal oscillator choice
Figure 5: Typical application circuit
NoteThe decoupling C5 should be closed to Pin 8 and Pin 9
Table 5: Bill of Material
Components C1,C2 C3 C4,C5 X1
Value/Description Suppliers Crystal load capacitor, 20pF Supply decoupling capacitor, 0.1uF AC decoupling capacitor, 100uF 32.768kHz crystal
Copyright (c)2009, KT Micro, Inc.
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7 Package
8 Order Information
Part Number Description KT0830 Single-chip stereo FM receiver Package SOP-16 MOQ 5000
Copyright (c)2009, KT Micro, Inc.
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KT0830E
9 Revision History
V1.0 V1.1 Official Release Update the first page
10 Contact Information
KT Micro, Inc. 22391 Gilberto, Suite D Rancho Santa Margarita, CA 92688 USA Tel: 949-713-4000 Fax: 949-713-4004 Email: sales@ktmicro.com 2 2 B 8 (100089) 8610-88891955 8610-88891977 sales@ktmicro.com http://www.ktmicro.com.cn
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