Rds signal-processing system-on-chip ic – Sanyo EP93F User Manual
Page 37
LC72151V
LC72722/M/PM
LC72151V
LC72722/M/PM
CE DI CL DO I/O-1 I/O-2 O-3
AOUT1
AVSS
AREF
AIN1
AOUT2
AIN2
TGO
TGI2
TGI1
PDS
PDM2
PDS
PDM1
XBUF
XIN
XOUT
FMIN
AMIN
HCTR/I-3
LCTR/I-4
VDD
VSS
AVDD
PHASE DETECTOR
CHARGE PUMP
UNLOCK
DETECTOR
CHARGE PUMP
for FAST LOCK
FAST LOCK UP
CONTROL
CCB
I/F
12bits PROGRAMMABLE
DIVIDER
SWALLOW COUNTER
1/16,1/17 4bits
REFERENCE
DIVIDER
UNIVERSAL
COUNTER
POWER
ON
RESET
DATA SHIFT REGISTER
LATCH
+
-
REFERENCE
VOLTAGE
ANTIALIASING
FILTER
SMOOTHING
FILTER
57kHz
BPF
(SCF)
TEST
PLL
(57kHz)
VREF
CLOCK
RECOVERY
(1187.5Hz)
DATA
DECODER
SYNC
DETECT-2
SYNC
DETECT-1
OSC/DIVIDER
MEMORY CONTROL
CLK(4.332MHz)
+5V
+5V
Vdda
Vssa
MPXIN
T2
T3 to T7
T1
CCB
DI
CE
CL
RAM
(24 BLOCK DATA)
ERROR CORRECTION
(SOFT DECISION)
SYNC/EC CONTROLLER
DO
XIN
XOUT
SYR
SYNC
RDS-ID
Vssd
Vddd
CIN
FLOUT
VREF
+
-
69
Car Audio
70
Car Audio
Overview
Functions
Overview
Functions
Block Diagram
Block Diagram
:CCB is SANYO's original bus format.
All bus addresses are managed by
SANYO for this format.
❋
❋
❋
❋
❋
:CCB is SANYO's original bus format.
All bus addresses are managed by
SANYO for this format.
❋
The LC72151V is a PLL frequency synthesizer IC that includes a high-speed locking circuit for FM reception.
This device makes it easy to implement high-performance RDS AM/FM tuners.
■
Bandpass filter: switched capacitor filter (SCF)
■
Demodulation: RDS data clock regeneration and demodulated data reliability information
■
Synchronization: Block synchronization detection with variable forward and backward
protection conditions
■
Error correction: soft decision and hard decision error correction
■
Buffer RAM: 24 blocks (about 500 ms) of data and flag memory
■
Data I/O: CCB interface (power on reset)
■
Packages:(LC72722):DIP24S(300mil)
(LC72722M):MFP24S(300mil)
(LC72722PM):MFP24(375mil)
RDS Signal-Processing System-on-Chip IC
RDS Signal-Processing System-on-Chip IC
The LC72722, LC72722M, and LC72722PM are system-on-chip signal demodulation and processing ICs for
the European Broadcasting Union (EBU) Radio Data System (RDS) and the US National Radio System Committee
(NRSC) Radio Broadcast Data System (RBDS).
These ICs integrate, on the same chip, bandpass filter, demodulation, synchronization, and error correction
circuits as well as buffer RAM, and provide effective error correction using soft decision error correction.
■
High-speed programmable dividers
◆
FMIN: 10 to 160 MHz pulse swallower
◆
AMIN: 2 to 40 MHz pulse swallower
0.5 to 10 MHz direct divider
■
IF counters
◆
HCTR: 0.4 to 25 MHZ for FM IF counting
◆
LCTR: 10 to 500 kHz for AM IF counting
1.0 to 20 10
3
Hz for frequency
measurement
■
Reference frequency
◆
One of 11 frequencies can be selected
(crystal element: 10.25 or 10.35 MHz)
◆
1.3 , 3.125, 5, 6.25, 9 , 10, 12.5, 25, 30 , and 50 kHz
: These frequencies cannot be used when a 10.25
crystal element is used.
■
Phase comparator
◆
Supports dead zone control
◆
Unlocked state detection circuit
◆
Deadlock clear circuit
Car Audio Electronic Tuning PLL
Frequency Synthesizer
Car Audio Electronic Tuning PLL
Frequency Synthesizer
■
Active low-pass filter amplifier
◆
Built-in operational amplifier for FM high-speed
locking circuit
◆
Built-in MOS transistor for AM
■
Crystal oscillator output buffer
■
I/O ports: general-purpose I/O: 2 pins
◆
Input: 4 pins (maximum)
◆
Output: 3 pins (maximum)
■
Serial data I/O
◆
Control and communication using the CCB format
■
Operating ranges
◆
Supply voltage: 4.5 to 5.5 V (VDD)
7.5 to 9.5 V (AVDD)
◆
Operating temperature: -40 to +85
°
C
■
Package: SSOP30 (275 mil)