Document
Ordering number : ENA2155
LC72720YVS
CMOS IC
Single-Chip RDS Signal-Processing System IC
http://onsemi.com
Overview
The LC72720YVS is a single-chip system IC that implement the signal processing required by the European Broadcasting Union RDS (Radio Data System) standard and by the US NRSC (National Radio System Committee) RBDS (Radio Broadcast Data System) standard. This IC include band-pass filter, demodulator, synchronization, and error correction circuits as well as data buffer RAM on chip and perform effective error correction using a soft-decision error correction technique.
Functions
• Band-pass filter : switched capacitor filter (SCF) • Demodulator : RDS data clock regeneration and demodulated data reliability information • Synchronization : Block synchronization detection (with variable backward and forward protection conditions) • Error correction : Soft-decision/hard-decision error correction • Buffer RAM : Adequate for 24 blocks of data (about 500ms) and flag memory • Data I/O : CCB interface (power on reset)
Features
• Error correction capability improved by soft-decision error correction • The load on the control microprocessor can be reduced by storing decoded data in the on-chip data buffer RAM. • Two synchronization detection circuits provide continuous and stable detection of the synchronization. • Data can be read out starting with the backward-protection block data after a synchronization reset. • Fully adjustment free
Specifications
• Operating power-supply voltage : • Operating temperature : • Package :
3.0 to 3.6V -40 to +85°C SSOP30(275mil)
• CCB is ON Semiconductor® ’s original format. All addresses are managed by ON Semiconductor® for this format.
• CCB is a registered trademark of Semiconductor Components Industries, LLC.
Semiconductor Components Industries, LLC, 2013 June, 2013
N1412HK B8-5256 No. A2155-1/18
LC72720YVS
Specifications
Absolute Maximum Ratings at Ta = 25°C, Vssd = Vssa = 0V
Parameter Maximum supply voltage Maximum input voltage
Maximum output voltage
Maximum output current Allowable power dissipation Operating temperature Storage temperature
Symbol Vddmax Vin1max Vin2max Vin3max Vo1max Vo2max Vo3max Io1max Io2max Io3max Pdmax
Topr Tstg
Pin Name Vddd, Vdda CL, DI, CE, SYR, T1, T2, T3, T4, T5, T6, T7, SYNC XIN MPXIN, CIN DO, SYNC, RDS-ID, T3, T4, T5, T6, T7 XOUT FLOUT DO, T3, T4, T5, T6, T7 XOUT, FLOUT SYNC, RDS-ID (Ta≤85°C)
Ratings -0.3 to +7.0 -0.3 to +7.0 -0.3 to Vddd+0.3 -0.3 to Vdda+0.3 -0.3 to +7.0 -0.3 to Vddd+0.3 -0.3 to Vdda+0.3 +6.0 +3.0 +20.0 150 -40 to +85 -55 to +125
Unit V V V V V V V mA mA mA
mW °C °C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Allowable Operating Ranges at Ta = -40 to 85°C, Vssd = Vssa = 0V
Parameter
Symbol
Pin Name
Conditions
Supply voltage
Input high-level voltage Input low-level voltage
Output voltage
Input amplitude
Guaranteed crystal Oscillator frequencies Crystal oscillator frequency deviation Data setup time Data hold time Clock low level time Clock high level time CE wait time CE setup time CE hold time CE high-level time Data latch change time
Data output time
Vdd1 Vdd2 VIH
VIL
VO VIN1 VIN2 VXIN
XTAL
TXtal
tSU tHD tCL tCH tEL tES tEH tCE tLC
tDC tDH
Vddd, Vdda Vddd CL, DI, CE, SYR, T1, T2
CL, DI, CE, SYR, T1, T2
DO, SYNC, RDS-ID, T3, T4, T5, T6, T7 MPXIN
XIN XIN, XOUT
XIN, XOUT
DI, CL DI, CL CL CL CE, CL CE, CL CE, CL CE
DO,CL DO,CE
Serial data hold voltage
f=57±2kHz 100% modulation composite CI≤120Ω (XS=0) CI≤70Ω (XS=1) fo=4.332MHz, 8.664MHz
Differs depending on the value of the pull-up resistor used.
min 3.0 2.0 0.7Vddd 0
100 400
0.75 0.75 0.75 0.75 0.75 0.75 0.75
Ratings typ
4.332 8.664
Unit max 3.6 V
V
6.5 V
0.3Vddd
V
6.5 50 1500 ±100
20 1.15
V
mVrms mVrms mVrms
MHz MHz
ppm
μs μs μs μs μs μs μs ms μs
0.46 0.46
μs μs
No. A2155-2/18
LC72720YVS
Electrical Characteristics at Ta = -40 to 85°C, Vssd = Vssa = 0V
Parameter
Input resistance Internal feedback resistance Center frequency -3dB band width Gain
Stop band Attenuation
Group delay deviation Reference voltage output Hysteresis Output low-level voltage
Input high-level current
Input low-level current Output off leakage current Current drain
Symbol
Pin Name
RMPXIN Rf
MPXIN-Vssa XIN
fc BW-3dB
Gain Att1 Att2 Att3 G-Delay
FLOUT FLOUT MPXIN-FLOUT FLOUT FLOUT FLOUT FLOUT
Vref Vref
VHIS VOL1 VOL2 IIH1 IIH2 IIL1 IIL2 IOFF
Idd
CL, DI, CE, SYR, T1, T2 DO, T3, T4, T5, T6, T7 SYNC, RDS-ID CL, DI, CE, SYR, T1, T2 XIN CL, DI, CE, SYR, T1, T2 XIN DO, SYNC, RDS-ID, T3, T4, T5, T6, T7 Vddd, Vdda
Conditions f=0 to 100kHz
f=57kHz Δf=±7kHz f<45kHz, f>70kHz f<20kHz f=57±1.2kHz
Vdda=5.0V
I=2mA I=8mA VI= Vddd VI=Vddd VI=0V VI=0V VO=6.5V
Vddd=Vdda =3.3V
Ratings min typ max
23 1.5
56.5 2.5 28 30 40 50
0.9 0.9
57.