Ordering number : ENA1494A
Bi-CMOS IC
LV2285VB
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
Pin 6
Ratings
Unit
Maximum supply voltage
VCC max
7.0
Maximum input voltage
Vin max
Vcc + 0.3
V
Minimum input voltage
Vin min
-0.3
V
Allowable power dissipation
Pd max
500
mW
Operating temperature
Topr
-10 to 85
°C
Storage temperature
Tstg
-55 to 150
°C
Ta ≤ 85°C, Mounted on a specified board.*
V
* Specified board: 114.3mm × 76.1mm × 1.6mm, glass epoxy board.
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
LV2285VB
Recommended Operating Conditions at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Recommended Supply voltage
VCC
Pin 6
3.3
V
Operating supply voltage
VCC op
Pin 6
2.8 to 5.5
V
Electrical Characteristics at Ta = 25°C, VCC = 3.3V, L/R input = 1kHz, 425mVrms, I2C bits = Initial
Parameter
Symbol
Ratings
Conditions
min
Circuit current
Standby current
ICC
typ
Pin 6 (No signal)
2
ISTB
Pin 6 (No signal, I C”EN”=”0”)
Minimum audio input
VAMIN
Pin 1 and 24 input
Maximum audio input
VAMAX
Pin 1 and 24 input
Unit
max
8
10
mA
40
60
μA
Audio and MPX Block
30
mVrms
900
Audio input frequency
FAF
Pin 1 and 24 input
20
Channel separation
SEP
Pin 7, composite output, L>R, R>L
20
40
Channel balance
CB
Pin 7, composite output
-2
0
+2
0.1
0.3
%
0.5
0.85
1.2
mVpp
2.9
3.8
4.6
mVrms
Total harmonic distortion
THD
Pin 7, composite output
Pilot tone output level
PMOD
I2C bits “ST”=”1”, “PILOT“=”1”
Composite output level
MPXOUT
2
30
15k
mVrms
Hz
dB
dB
Audio mute
MUTE
I C bit “MUTE”=”1”
35
dB
Audio attenuation step
ATT(1)
ATT[2:0] = ”111” − “110”
2.3
dB
ATT(2)
ATT[2:0] = ”110” − “101”
2.2
dB
ATT(3)
ATT[2:0] = ”101” − “100”
2.8
dB
ATT(4)
ATT[2:0] = ”100” − “011”
2.3
dB
ATT(5)
ATT[2:0] = ”011” − “010”
4.3
dB
ATT(6)
ATT[2:0] = ”010” − “001”
3.3
dB
ATT(7)
ATT[2:0] = ”001” − “000”
1.6
dB
FXOSC(1)
Pin 21 and Pin22
76
kHz
Audio Control Frequency
FCONT
Pin 2 and 23 input
7.5
kHz
Audio Control input
VCONT
Pin 2 and 23 input
1.2
Vp-p
TOFF
The time from no signal to turn-off. If the VCC
voltage is supplied, LV2285VB maintains I2C
Crystal Oscillator Frequency(1)
Audio control Block
Auto sleep Block
Turn-off time
45
70
300
sec
data. Ctc (Pin 20) = 2.2μF
PLL Block
I2C input “High” voltage
VH
0.8VCC
VCC+0.3
V
I2C input “Low” voltage
VL
-0.3
0.2VCC
V
RF input frequency
FPLL
Step = 100kHz, See table 2
Crystal Oscillator frequency
FXOSC(2)
Pin 16
External Clock Frequency
FEXT
• External clock injection to Pin 16 instead of
70
16
1
110
MHz
-
MHz
24
MHz
16MHz crystal oscillation.
• When the LSI is standby mode, external
clock should be stop.
CP output current
ICP
CP voltage = 1.4V
μA
30
RF Block
RFoutput
RFOUT
f = 98MHz, RF[2:0] = ”011”, Pin 12 output
109
112
115
dBμV
RF output adjustment step
RFSTEP
RF[2:0] = ”000” to “111”, totally 8 steps.
0.3
0.9
1.4
dB
RF frequency
FRF
100kHz step
70
110
MHz
I2C Block
I2C input switch
I2CSW *
Input to Pin 2/23 : Audio control I/F
Input to Pin 17/18 : I2C I/F
-0.3
0.2VCC
V
0.8VCC
VCC+0.3
V
* Use case ( I2C I/F ) : Please set Pin 19 = High.
No.A1494-2/11
LV2285VB
Package Dimensions
unit : mm (typ)
3287
6.5
24
0.5
6.4
4.4
13
12
1
0.5
0.15
0.22
0.1
(1.3)
1.5max
(0.5)
SANYO : SSOP24(225mil)
Pin Assignment
L-INPUT 1
24 R-INPUT
L-CONT 2
23 R-CONT
GND 3
22 76k OSC IN
MPX+B 4
21 76k OSC OUT
GND 5
VCC 6
20 TC
LV2285VB
19 I2CSW
COMPOSITE OUT 7
18 SDA
CP OUT 8
17 SCL
GND 9
16 XTAL
VCO 10
15 GND
RF+B 11
14 PLL+B
13 GND
RF OUT 12
Top view
No.A1494-3/11
LV2285VB
Block Diagram and Application Circuit Example
I2CSW
R-INPUT
SDA
SCL
16MHz
76kHz
24
23
22
21
20
19
18
17
16
15
14
13
Auto Sleep
X’tal OSC
Selector & Shift Register
X’tal
OSC
(RF[2:0])
Switch
(P[10:0])
38kHz
1/2
38kHz
(MUTE,ST)
R-Counter
(ATT[2:0])
1/2
Phase DET
P-Counter
(PILOT)
Switch
Charge Pump
Attenuation
VCO
2.8V
Regulator
1
2
3
4
5
6
7
8
9
10
11
12
+
L-INPUT
VCC
+
No.A1494-4/11
LV2285VB
Pin Function
Pin No.
1
Pin name
L-INPUT
DC voltage (V)
0
Function
Equivalent circuit
Left channel input. If audio source DC voltage
6
is not 0V, AC coupling capacitance is
4
required. Pre-emphasis capacitance and
resistance should be required.
1kΩ
1
24
10kΩ
5
2
L-CONT
1.2
Data input pin for Audio control.
External coupling capacitance is required.
6
2
50kΩ
23
5
3
GND
4
MPX+B
0
2.8
LDO regulator output.
6
External decoupling capacitance is required.
4
5
5
GND
0
6
VCC
3.3
7
COMPOSITE
Stereo modulated output.
6
OUT
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
Equivalent circuit
Transistor BASE pin for Colpitz oscillator.
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
6
11
450Ω
DC bias 2.8V.
20Ω
12
13
13
GND
14
PLL+B
0
2.8
LDO regulator output for digital blocks.
6
14
5
15
GND
16
XTAL
0
16MHz crystal is needed for PLL reference
frequency. If external clock is injected to pin
16. Frequency should be from 1MHz to
6
14
24MHz and N(integer) × 200kHz.
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
DC voltage (V)
Function
I2C data input.
SDA
Equivalent circuit
6
18
CMOS Logic Inpit
15
19
The change switch of the I2C data input pin.
I2CSW
6
When Pin 19 = GND case, Audio control I/F is
selected (Pin 2/23). In one side, when Pin 19 =
10kΩ
VCC case, I2C I/F is selected (Pin 17/18).
19
CMOS Logic Inpit
15
20
TC
2.8
Connect capacitance. Turn-off time is in
6
proportion to this capacity value.
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
1MΩ
1kΩ
21
20
15
22
76k OSC IN
0.7
See pin 21.
See pin 21.
23
R-CONT
1.2
Clock Input for Audio Control.
See pin 2.
24
R-INPUT
0
See Pin 2
See pin 1.
See pin 1.
No.A1494-7/11
LV2285VB
2
I C Bus Definition
Table 1 : I2C Register map
Name
Bit
Byte
ACK
MSB *1
Address Byte
1
Control Byte 1
2
Control Byte 2
3
Control Byte 3
4
Control Byte 4
LSB
AD7
AD6
AD5
AD4
AD3
AD2
AD1
R/W
1
1
0
1
0
0
0
0
P10
P9
P8
P7
P6
P5
P4
P3
0
1
1
1
1
0
1
0
P2
P1
P0
RES2
ST
PILOT
EN
MUTE
1
0
0
0
1
1
0
0
RES1
RES0
RF2
RF1
RF0
ATT2
ATT1
ATT0
*2
*2
0
1
1
0
1
0
R6
R5
R4
R3
R2
R1
R0
TEST
1
0
1
0
0
0
0
0
5
A
A
A
A
A
*1 : MSB is transmitted first.
*2 : Don’t care
Table 2 : I2C Register map description
Bit
Name
Initial
Description
AD[7:0]
Address bit
1101 000
LV2285VB I2C 7bit address
R/W
Read / Write
0
Write mode only
A
Acknowledge
P[10:0]
Programmable counter
0111 1010 100
11bit Programmable counter.
RF frequency=(P10 × 210 + P9 × 29 + ... P1 × 21 + P0) × 100kHz
RES2
Reserved bit
0
ST
MONO / Stereo
1 (stereo)
Stereo modulation control.
“ST”=”0” Monaural mode, “ST”=”1” : Stereo mode.
PILOT
Pilot tone output
1
Pilot signal control.
“PILOT”=”0” : No pilot, “PILOT”=”1” : with Pilot
EN
Enable
0 (Standby)
Internal LDO control.
“EN”=”1” : Active, “EN”=”0” : Standby
MUTE
Mute
0
Audio mute control.
“MUTE”=”1” : Enable, “MUTE”=”0” : Disable
RES[1:0]
Reserved bits
00
RF[2:0]
RF output adjustment
011
RF output level control.
RF[2:0]=”111” : Maximum, RF[2:0]=”000” : Minimum
ATT[2:0]
Audio attenuator
010
This attenuator is used to adjust FM modulation level.”111” is Minimum (0dB).”000”
is Maximum (19dB). See Audio and MPX Block specification.
R[6:0]
Reference counter
1010 000
TEST
Reserved bit
0
7bit reference counter. Reference frequency should be set 100kHz.
{Crystal oscillator frequency(Pin 16)}/{(R6 × 26 + R5 × 25…+R1 × 21 + R0) × 2} = 100kHz
No.A1494-8/11
LV2285VB
2
I C Bus Operation
SDA
Serial I/F Bus
Controller
(Master)
Address Byte
Master
S 6 5 4 3 2 1 0 W
MSB
MSB First
LV2285VB
(Slave)
SCL
Control Byte 1
Control Byte 4
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
LSB MSB
LSB
A
Slave
MSB
F
LSB
A
S → Start condition
A
F → Stop condition
A → Acknowledge
Time chart
tBUF
tHD ; STA
tSU ; STO
tSU ; DAT
SDA
SCL
Start
condition
tLOW
tR
tHD ; DAT
tHIGH
Stop
condition
tF
Table 3 : Timing specification
Parameter
Ratings
Symbol
min
typ
unit
max
SCL clock frequency
fSCL
Bus free time between a STOP and START condition
tBUF
4.7
100
kHz
μs
Hold time START condition
tHD;STA
4.0
μs
Low period of the SCL clock
tLOW
4.7
μs
High period of the SCL clock
tHIGH
4.0
μs
Data hold time
tHD;DAT
0.0
μs
Data set-up time
tSU;DAT
250
Rise time of both SDA and SCL signals
tR
1000
ns
Fall time of both SDA and SCL signals
tF
300
ns
Set-up time for STOP condition
tSU;STO
4.0
μs
μs
I2C Bus AC characteristics: Temp = 25°C, VCC = 3.3V
Note: I2C Bus is registered trademark of the Philips Co..
No.A1494-9/11
LV2285VB
Usage note
Composite output (pin 7)
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]
38kHz [ST]
Rch (24pin)
Lch (1pin)
19kHz [PILOT]
ATT [2:0]
Composite output (pin 7)
Main
(L+R)
0
PILOT
15
38
53
Figure 2
Table 1
Audio input signal level V.S ATT[2:0] setting
Large attenuation
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.
23
Frequency [kHz]
Figure 1
FM modulation
The LV2285VB have best performance of FM modulation at
±75kHzdev.
19
Sub
(L−R)
Small attenuation
000
L , R input level = 780mVrms
001
L , R input level = 640mVrms
010
L , R input level = 425mVrms
011
L , R input level = 260mVrms
100
L , R input level = 190mVrms
101
L , R input level = 140mVrms
110
L , R input level = 110mVrms
111
L , R input level = 80mVrms
Please refer to Table 1 to obtain better audio quality.
No.A1494-10/11
LV2285VB
AC Test Circuit
SW6
I2C switch
+
b
16MHz
76kHz
24
23
22
External CLOCK
INPUT
A
+
SW1 a
SW5
SW4
VCEN
R-INPUT
VCC
SDA
21
20
19
18
SCL
17
16
15
14
13
8
9
10
11
12
LV2285VB
SG INPUT
b
L-INPUT
+
+
2
3
4
5
6
7
+
RF OUT
a
VCC
R-OUT
L-OUT
Stereo DEC
LA3450
SW3
b
COMP-OUT
1
SW2 a
VA
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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. product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed
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This catalog provides information as of May, 2011. Specifications and information herein are subject
to change without notice.
PS No.A1494-11/11