LV2285VB_11

Ordering number : ENA1494A Bi-CMOS IC LV2285VB Overview FM transmitter IC with Stereo Modulation, Auto Sleep Function The LV2285VB is IC for FM transmitter. This IC is chiefly composed of the following block. MPX block for stereo modulation, RFVCO block for FM modulation, and PLL block for RF output frequency. At the result, this IC achieves FM transmitter with low power consumption by 1chip. Additionally, the auto sleep function is installed. This function automatically switches the standby and active according to the state of the audio input. It is possible to achieve a more dynamic electric power reduction as a result. Feature • The function necessary for FM transmission has been integrated into 1chip. • The best low current consumption operation for portable application • The auto sleep function to reduce more dynamic current consumption • General I2C I/F and, SANYO original audio control I/F is installed Functions • Audio: Stereo modulation using pilot tone system, Audio attenuation • RF: VCO, programmable gain driver amplifier • PLL: 70MHz to 110MHz 100kHz step • Bus control: I2C I/F , Audio control I/F • Regulator: 2.8V LDO regulator, Auto sleep function Specifications Parameter Maximum Ratings at Ta = 25°C Symbol VCC max Vin max Vin min Pd max Topr Tstg Ta ≤ 85°C, Mounted on a specified board.* Pin 6 Conditions Ratings 7.0 Vcc + 0.3 -0.3 500 -10 to 85 -55 to 150 Unit V V V mW °C °C Maximum supply voltage Maximum input voltage Minimum input voltage Allowable power dissipation Operating temperature Storage temperature * Specified board: 114.3mm × 76.1mm × 1.6mm, glass epoxy board. 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To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer' s products or equipment. 51111 SY 20110428-S00003/62409 MS 20090615-S00012 No.A1494-1/11 LV2285VB Recommended Operating Conditions at Ta = 25°C Parameter Recommended Supply voltage Operating supply voltage Symbol VCC VCC op Pin 6 Pin 6 Conditions Ratings 3.3 2.8 to 5.5 Unit V V Electrical Characteristics at Ta = 25°C, VCC = 3.3V, L/R input = 1kHz, 425mVrms, I2C bits = Initial Parameter Circuit current Standby current Audio and MPX Block Minimum audio input Maximum audio input Audio input frequency Channel separation Channel balance Total harmonic distortion Pilot tone output level Composite output level Audio mute Audio attenuation step VAMIN VAMAX FAF SEP CB THD PMOD MPXOUT MUTE ATT(1) ATT(2) ATT(3) ATT(4) ATT(5) ATT(6) ATT(7) Crystal Oscillator Frequency(1) Audio control Block Audio Control Frequency Audio Control input Auto sleep Block Turn-off time TOFF The time from no signal to turn-off. If the VCC voltage is supplied, LV2285VB maintains I2C data. Ctc (Pin 20) = 2.2μF PLL Block I2C input “High” voltage I2C input “Low” voltage RF input frequency Crystal Oscillator frequency External Clock Frequency VH VL FPLL FXOSC(2) FEXT Step = 100kHz, See table 2 Pin 16 • External clock injection to Pin 16 instead of 16MHz crystal oscillation. • When the LSI is standby mode, external clock should be stop. CP output current RF Block RFoutput RF output adjustment step RF frequency I2C Block I2C input switch I2CSW * Input to Pin 2/23 : Audio control I/F Input to Pin 17/18 : I2C I/F * Use case ( I2C I/F ) : Please set Pin 19 = High. -0.3 0.8VCC 0.2VCC VCC+0.3 V V RFOUT RFSTEP FRF f = 98MHz, RF[2:0] = ”011”, Pin 12 output RF[2:0] = ”000” to “111”, totally 8 steps. 100kHz step 109 0.3 70 112 0.9 115 1.4 110 dBμV dB MHz ICP CP voltage = 1.4V 30 μA 1 0.8VCC -0.3 70 16 VCC+0.3 0.2VCC 110 24 V V MHz MHz MHz 45 70 300 sec FCONT VCONT Pin 2 and 23 input Pin 2 and 23 input 7.5 1.2 kHz Vp-p FXOSC(1) I C bit “MUTE”=”1” ATT[2:0] = ”111” − “110” ATT[2:0] = ”110” − “101” ATT[2:0] = ”101” − “100” ATT[2:0] = ”100” − “011” ATT[2:0] = ”011” − “010” ATT[2:0] = ”010” − “001” ATT[2:0] = ”001” − “000” Pin 21 and Pin22 2 Symbol ICC ISTB Pin 6 (No signal) Conditions min 2 Ratings typ 8 40 max 10 60 Unit mA μA Pin 6 (No signal, I C”EN”=”0”) Pin 1 and 24 input Pin 1 and 24 input Pin 1 and 24 input Pin 7, composite output, L>R, R>L Pin 7, composite output Pin 7, composite output I2C bits “ST”=”1”, “PILOT“=”1” 30 900 20 20 -2 40 0 0.1 0.5 2.9 30 0.85 3.8 35 2.3 2.2 2.8 2.3 4.3 3.3 1.6 76 +2 0.3 1.2 4.6 15k mVrms mVrms Hz dB dB % mVpp mVrms dB dB dB dB dB dB dB dB kHz No.A1494-2/11 LV2285VB Package Dimensions unit : mm (typ) 3287 6.5 24 13 4.4 6.4 1 0.5 (0.5) 0.22 12 0.15 SANYO : SSOP24(225mil) Pin Assignment L-INPUT 1 L-CONT 2 GND 3 MPX+B 4 GND 5 VCC 6 COMPOSITE OUT 7 CP OUT 8 GND 9 VCO 10 RF+B 11 RF OUT 12 Top view 24 R-INPUT 23 R-CONT 22 76k OSC IN 21 76k OSC OUT 20 TC 0.1 (1.3) 1.5max 0.5 LV2285VB 19 I2CSW 18 SDA 17 SCL 16 XTAL 15 GND 14 PLL+B 13 GND No.A1494-3/11 LV2285VB Block Diagram and Application Circuit Example R-INPUT I2CSW SDA SCL 16MHz 76kHz 24 23 22 21 20 Auto Sleep 19 18 17 16 15 14 13 X’tal OSC Switch 38kHz 1/2 38kHz Selector & Shift Register X’tal OSC (RF[2:0]) (P[10:0]) (MUTE,ST) (ATT[2:0]) 1/2 R-Counter Phase DET P-Counter (PILOT) Switch Attenuation 2.8V Regulator Charge Pump VCO 1 L-INPUT 2 3 4 + 5 6 7 8 9 10 11 12 VCC + No.A1494-4/11 LV2285VB Pin Function Pin No. 1 Pin name L-INPUT DC voltage (V) 0 Function Left channel input. If audio source DC voltage is not 0V, AC coupling capacitance is required. Pre-emphasis capacitance and resistance should be required. 1kΩ Equivalent circuit 6 4 1 24 10kΩ 5 2 L-CONT 1.2 Data input pin for Audio control. External coupling capacitance is required. 6 2 23 50kΩ 5 3 4 GND MPX+B 0 2.8 LDO regulator output. External decoupling capacitance is required. 6 4 5 5 6 7 GND VCC COMPOSITE OUT 0 3.3 Stereo modulated output. 6 4 9.4kΩ 7 5.1kΩ 5 8 CP OUT Charge pump current output. 6 4 30μA 8 30μA 9 9 GND 0 Continued on next page. No.A1494-5/11 LV2285VB Continued from preceding page. Pin No. 10 Pin name VCO DC voltage (V) 2.2 Function Transistor BASE pin for Colpitz oscillator. Equivalent circuit 6 11 10 9 11 RF+B 2.8 LDO regulator output for RF blocks. 6 11 5 12 RF OUT 2.8 Collector output. Inductance should be connected Between pin 11 and pin 12 for getting resonant frequency and making pin 12 DC bias 2.8V. 6 11 450Ω 20Ω 12 13 13 14 GND PLL+B 0 2.8 LDO regulator output for digital blocks. 6 14 5 15 16 GND XTAL 0 16MHz crystal is needed for PLL reference frequency. If external clock is injected to pin 16. Frequency should be from 1MHz to 24MHz and N(integer) × 200kHz. 6 14 16 15 17 SCL I2C clock input. 6 10kΩ 17 CMOS Logic Inpit 15 Continued on next page. No.A1494-6/11 LV2285VB Continued from preceding page. Pin No. 18 Pin name SDA DC voltage (V) I2C data input. Function Equivalent circuit 6 18 CMOS Logic Inpit 15 19 I2CSW The change switch of the I2C data input pin. When Pin 19 = GND case, Audio control I/F is selected (Pin 2/23). In one side, when Pin 19 = VCC case, I2C I/F is selected (Pin 17/18). 6 10kΩ 19 CMOS Logic Inpit 15 20 TC 2.8 Connect capacitance. Turn-off time is in proportion to this capacity value. 6 1kΩ 20 1kΩ 15 21 76k OSC OUT 2.0 For stereo modulator pilot signal and sub carrier. 76kHz crystal should be connected between Pin 21 and Pin 22. 6 14 1kΩ 1kΩ 20 15 22 23 24 76k OSC IN R-CONT R-INPUT 0.7 1.2 0 See pin 21. Clock Input for Audio Control. See Pin 2 See pin 1. See pin 1. See pin 21. See pin 2. 1MΩ 21 No.A1494-7/11 LV2285VB I C Bus Definition Table 1 : I2C Register map Name Byte MSB *1 Address Byte 1 AD7 1 Control Byte 1 2 P10 0 Control Byte 2 3 P2 1 Control Byte 3 4 RES1 *2 R6 Control Byte 4 *1 : MSB is transmitted first. *2 : Don’t care 5 1 0 1 0 0 0 0 0 AD6 1 P9 1 P1 0 RES0 *2 R5 AD5 0 P8 1 P0 0 RF2 0 R4 AD4 1 P7 1 RES2 0 RF1 1 R3 AD3 0 P6 1 ST 1 RF0 1 R2 AD2 0 P5 0 PILOT 1 ATT2 0 R1 AD1 0 P4 1 EN 0 ATT1 1 R0 Bit LSB R/W 0 P3 0 MUTE 0 ATT0 0 TEST A A A A A ACK 2 Table 2 : I2C Register map description Bit AD[7:0] R/W A P[10:0] RES2 ST PILOT EN MUTE RES[1:0] RF[2:0] ATT[2:0] R[6:0] TEST Name Address bit Read / Write Acknowledge Programmable counter Reserved bit MONO / Stereo Pilot tone output Enable Mute Reserved bits RF output adjustment Audio attenuator Reference counter Reserved bit 0111 1010 100 0 1 (stereo) 1 0 (Standby) 0 00 011 010 1010 000 0 RF output level control. RF[2:0]=”111” : Maximum, RF[2:0]=”000” : Minimum This attenuator is used to adjust FM modulation level.”111” is Minimum (0dB).”000” is Maximum (19dB). See Audio and MPX Block specification. 7bit reference counter. Reference frequency should be set 100kHz. {Crystal oscillator frequency(Pin 16)}/{(R6 × 26 + R5 × 25…+R1 × 21 + R0) × 2} = 100kHz Stereo modulation control. “ST”=”0” Monaural mode, “ST”=”1” : Stereo mode. Pilot signal control. “PILOT”=”0” : No pilot, “PILOT”=”1” : with Pilot Internal LDO control. “EN”=”1” : Active, “EN”=”0” : Standby Audio mute control. “MUTE”=”1” : Enable, “MUTE”=”0” : Disable 11bit Programmable counter. RF frequency=(P10 × 210 + P9 × 29 + ... P1 × 21 + P0) × 100kHz Initial 1101 000 0 LV2285VB I2C 7bit address Write mode only Description No.A1494-8/11 LV2285VB I C Bus Operation SDA SCL LV2285VB (Slave) 2 Serial I/F Bus Controller (Master) Address Byte Control Byte 1 Control Byte 4 Master S6543210W 76543210 76543210 F MSB MSB First LSB MSB LSB MSB LSB Slave A A A S → Start condition F → Stop condition A → Acknowledge Time chart tBUF tHD ; STA tSU ; DAT tSU ; STO SDA SCL Start condition tLOW tR tHD ; DAT tHIGH tF Stop condition Table 3 : Timing specification Parameter SCL clock frequency Bus free time between a STOP and START condition Hold time START condition Low period of the SCL clock High period of the SCL clock Data hold time Data set-up time Rise time of both SDA and SCL signals Fall time of both SDA and SCL signals Set-up time for STOP condition I2C Bus AC characteristics: Temp = 25°C, VCC = 3.3V Note: I2C Bus is registered trademark of the Philips Co.. fSCL tBUF tHD;STA tLOW tHIGH tHD;DAT tSU;DAT tR tF tSU;STO 4.0 4.7 4.0 4.7 4.0 0.0 250 1000 300 Symbol min Ratings typ max 100 kHz μs μs μs μs μs μs ns ns μs unit No.A1494-9/11 LV2285VB Usage note Stereo modulation In generally, How to generate stereo modulating signals explain below figure 1. LV2285VB generate composite signal like below figure 2. And it is possible to control sub signals at register [ST]. Pilot signal is controlled at register [PILOT] Composite output (pin 7) 38kHz [ST] Rch (24pin) Lch (1pin) Main (L+R) PILOT Sub (L−R) 19kHz [PILOT] ATT [2:0] Composite output (pin 7) 0 15 19 23 38 53 Frequency [kHz] Figure 1 Figure 2 FM modulation The LV2285VB have best performance of FM modulation at ±75kHzdev. FM modulation level changes in proportion to composite output level (pin 7) In LV2285VB composed of recommended parts, Table 1 is shown relationship that set ATT [2:0] value against audio input signal level. Please refer to Table 1 to obtain better audio quality. Table 1 Audio input signal level V.S ATT[2:0] setting Large attenuation 000 001 010 011 100 101 110 Small attenuation 111 L , R input level = 780mVrms L , R input level = 640mVrms L , R input level = 425mVrms L , R input level = 260mVrms L , R input level = 190mVrms L , R input level = 140mVrms L , R input level = 110mVrms L , R input level = 80mVrms No.A1494-10/11 LV2285VB AC Test Circuit SW6 VCEN VCC SW4 SW5 External CLOCK INPUT R-INPUT + SW1 a b + A I2C switch 16MHz 76kHz SDA SCL 24 23 22 21 20 19 18 17 16 15 14 13 SG INPUT LV2285VB 1 SW2 a b 2 3 4 + 5 6 7 8 9 10 11 12 RF OUT L-INPUT + + VCC a Stereo DEC LA3450 SW3 b COMP-OUT R-OUT L-OUT VA SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. 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SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of May, 2011. Specifications and information herein are subject to change without notice. PS No.A1494-11/11