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Ordering number : ENA1494A
LV2285VB
Bi-CMOS IC
FM transmitter IC with
Stereo Modulation, Auto Sleep Function
Overview
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
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Maximum supply voltage
Maximum input voltage
VCC max
Vin max
Pin 6
Minimum input voltage
Vin min
Allowable power dissipation
Pd max
Ta 85°C, Mounted on a specified board.*
Operating temperature
Topr
Storage temperature
Tstg
* Specified board: 114.3mm × 76.1mm × 1.6mm, glass epoxy board.
Ratings
7.0
Vcc + 0.3
-0.3
500
-10 to 85
-55 to 150
Unit
V
V
V
mW
°C
°C
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer's products or equipment. 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
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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
Symbol
Conditions
Ratings
min typ max
Circuit current
Standby current
Audio and MPX Block
ICC
ISTB
Pin 6 (No signal)
Pin 6 (No signal, I2C”EN”=”0”)
8 10
40 60
Minimum audio input
Maximum audio input
Audio input frequency
VAMIN
VAMAX
FAF
Pin 1 and 24 input
Pin 1 and 24 input
Pin 1 and 24 input
30
900
20 15k
Channel separation
SEP
Pin 7, composite output, L>R, R>L
20 40
Channel balance
CB Pin 7, composite output
-2 0 +2
Total harmonic distortion
Pilot tone output level
THD
PMOD
Pin 7, composite output
I2C bits “ST”=”1”, “PILOT“=”1”
0.1
0.5 0.85
0.3
1.2
Composite output level
Audio mute
MPXOUT
MUTE
I2C bit “MUTE”=”1”
2.9 3.8 4.6
30 35
Audio attenuation step
ATT(1)
ATT[2:0] = ”111” “110”
2.3
ATT(2)
ATT[2:0] = ”110” “101”
2.2
ATT(3)
ATT[2:0] = ”101” “100”
2.8
ATT(4)
ATT[2:0] = ”100” “011”
2.3
ATT(5)
ATT[2:0] = ”011” “010”
4.3
ATT(6)
ATT[2:0] = ”010” “001”
3.3
ATT(7)
ATT[2:0] = ”001” “000”
1.6
Crystal Oscillator Frequency(1) FXOSC(1)
Pin 21 and Pin22
76
Audio control Block
Audio Control Frequency
Audio Control input
Auto sleep Block
FCONT
VCONT
Pin 2 and 23 input
Pin 2 and 23 input
7.5
1.2
Turn-off time
TOFF
The time from no signal to turn-off. If the VCC 45 70 300
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
VH
VL
FPLL
Step = 100kHz, See table 2
0.8VCC
-0.3
70
VCC+0.3
0.2VCC
110
Crystal Oscillator frequency
FXOSC(2)
Pin 16
16 -
External Clock Frequency
FEXT
CP output current
RF Block
ICP
External clock injection to Pin 16 instead of
16MHz crystal oscillation.
When the LSI is standby mode, external
clock should be stop.
CP voltage = 1.4V
1 24
30
RFoutput
RF output adjustment step
RF frequency
I2C Block
I2C input switch
RFOUT
RFSTEP
FRF
I2CSW *
* Use case ( I2C I/F ) : Please set Pin 19 = High.
f = 98MHz, RF[2:0] = ”011”, Pin 12 output
RF[2:0] = ”000” to “111”, totally 8 steps.
100kHz step
Input to Pin 2/23 : Audio control I/F
Input to Pin 17/18 : I2C I/F
109
0.3
70
-0.3
0.8VCC
112 115
0.9 1.4
110
0.2VCC
VCC+0.3
Unit
mA
μA
mVrms
mVrms
Hz
dB
dB
%
mVpp
mVrms
dB
dB
dB
dB
dB
dB
dB
dB
kHz
kHz
Vp-p
sec
V
V
MHz
MHz
MHz
μA
dBμV
dB
MHz
V
V
No.A1494-2/11
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Package Dimensions
unit : mm (typ)
3287
6.5
24 13
LV2285VB
1
(0.5)
0.5
12
0.22
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
LV2285VB
Top view
24 R-INPUT
23 R-CONT
22 76k OSC IN
21 76k OSC OUT
20 TC
19 I2CSW
18 SDA
17 SCL
16 XTAL
15 GND
14 PLL+B
13 GND
No.A1494-3/11
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