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LC7851E Schematic ( PDF Datasheet ) - Sanyo Semicon Device

Teilenummer LC7851E
Beschreibung QPSK Demodulation and Audio Signal-Processing IC for Satellite Broadcast Reception
Hersteller Sanyo Semicon Device
Logo Sanyo Semicon Device Logo 




Gesamt 9 Seiten
LC7851E Datasheet, Funktion
Ordering number : EN5691
CMOS LSI
LC7851E
QPSK Demodulation and Audio Signal-Processing IC
for Satellite Broadcast Reception
Overview
The LC7851E demodulates the QPSK (quadrature phase
shift keying) modulated audio data broadcast by the
Japanese BS and CS broadcast satellites and converts that
data to an analog audio signal. This IC integrates on a
single chip the audio system signal processing required for
BS and CS receivers from QPSK demodulation to analog
audio reproduction. The main functions provided by the
LC7851E include QPSK demodulation, differential
decoding conversion, descrambling, deinterleaving, and
error correction. It also generates a PCM audio signal. The
PCM audio signal is converted to an analog audio signal
by on-chip digital filters and A/D converters.
Features
• QPSK demodulator, PCM decoder, digital filters, D/A
converters, and operational amplifiers integrated on a
single chip.
• The number of required external components has been
reduced and adjustment-free operation achieved in the
QPSK demodulator by implementing that block as a
digital circuit on a single chip.
• CPU interface using an I2C bus
• Interface circuits for CORTEC and SkyPort
descramblers
Functions
• QPSK demodulation
• Bit timing clock recovery
• Differential decoding conversion and parallel-to-serial
conversion
• Frame synchronization (forward protection: 8 cycles,
back protection: 3 cycles): Frame synchronized/not
synchronized detection flag output provided.
• Tenth-order M-series descrambling
• Deinterleaving
• BCH (63, 56) error correction and dual error detection:
Single error detected flag output provided.
• Support for both interpolation and previous data hold
when a dual error is detected.
Control bit majority judgment protection every 16
frames
• Register data previous value hold when dual errors are
detected using BCH(7,3)
• Ten to 14 bit expansion of audio data during A mode
broadcasts.
• Data protection using majority control for the upper bits
of the audio data during B mode broadcasts
• Full complement of muting functions
— Audio suppression provided (bit 16 of the post-
majority decision control bits)
— Non-audio signal suppression (bits 2 to 5 of the post-
majority decision control bits)
— Forced muting
— Muting when not synchronized
— Muting when large numbers of errors are detected
(modifiable conditions)
— Channel switching
— Charged (pay-per-view) program flag muting
— Mute detection output provided.
• General-purpose ports (2 input ports and 8 output ports)
• EIAJ digital audio interface output
• 8× oversampling digital filters
• Multi-bit D/A converter (with built-in output operational
amplifiers)
• 5 V single-voltage power supply
• QFP (QIP) 64E package
Package Dimensions
unit: mm
3195-QFP64E
[LC7851E]
SANYO: QIP64E
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
83097HA(OT) No. 5691-1/9






LC7851E Datasheet, Funktion
LC7851E
Specifications
Absolute Maximum Ratings at Ta = 25°C, VSS = 0 V
Supply voltage
Input voltage
Parameter
Output voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VDD
VI1
VI2
VO
Pd max
Topr
Tstg
Conditions
Pins other than SCL and SDA
SCL and SDA
Ta = –20 to +75°C
Allowable Operating Ranges at Ta = 25°C
Ratings
–0.3 to +7.0
–0.3 to VDD+0.3
–0.3 to +5.3
–0.3 to VDD +0.3
360
–20 to +75
–40 to +125
Parameter
Supply voltage
Input high-level voltage
Input low-level voltage
QPSKI input voltage
Symbol
VDD
VIH
VIL
VQPSKI
Conditions
min
4.5
0.75 VDD
0
0.7
Ratings
typ
5.0
0.9
max
5.5
VDD
0.25 VDD
1.1
DC Characteristics at Ta = –20 to +75°C, VDD = 4.5 to 5.5 V, GND = 0 V
Current drain
Parameter
Output high-level current
Symbol
Conditions
IDD
IOH1
VOH = VDD – 0.4 V ; VOH = VDD – 0.4 V,
CMOS output pins:PHCNT, LOIN, MOD,
DSTRO, FRM, ERR, CK2M, BSTRO, MUTO,
DADO, REQ, SYCKO
Ratings
min typ
68
1.0
max
98
Output low-level current 1
Output amplitude level
Input high-level current
Input low-level current
Output load resistance
IOH2
IOL1
IOL2
IOL3
IOL4
VCK5M
IIH
IIL
RL
VOH = VCK5MH – 25 mV, CK5M
VOL = 0.4 V ; CMOS output pins: PHCNT,
LOIN, MOD, DSTRO, FRM, ERR, CK2M,
BSTRO, MUTO, DADO, REQ, SYCKO
VOL = 0.4 V, open drain output
Pin 1: P0 to P7
VOL = 0.4 V, open drain output
Pin 2: SDA
VOL = VCK5ML + 25 mV, CK5M
IOH = 30 µA, CK5M
VI = VDD, Schmitt inputs: TSL, RST, TEST1,
TEST2, BSTRI, DSTRI1, DSTRI2, DASL,
MUTI, SCL, SDA, P0 to P7
VI = VSS, Schmitt inputs: TSL, RST, TEST1,
TEST2, BSTRI, DSTRI1, DSTRI2, DASL,
MUTI, SCL, SDA, P0 to P7
AOUTL and AOUTR
–350
1.0
1.0
4.0
100
236
–10
5.0
295
D/A Converter Characteristics at Ta = –20 to +75°C, VDD = 4.5 to 5.5 V, GND = 0 V
Parameter
Symbol
Conditions
Ratings
min typ
Resolution
RES 1 kHz 0 dB
16
Total harmonic distortion
THD1
THD2
1 kHz A mode, FS - 18 dB *
1 kHz B mode, FS - 18 dB *
0.08
0.05
Signal-to-noise ratio
S/N 1 kHz 0 dB *
105
Crosstalk
C. T 1 kHz 0 dB *
95
Full scale output voltage
VFS
2.8 3.0
Note: *Values when measured in the Sanyo evaluation board and with a QPSK modulated signal (1 kHz sine wave) input.
–100
350
354
10
max
3.2
Unit
V
V
V
V
mW
°C
°C
Unit
V
V
V
V
Unit
mA
mA
µA
mA
mA
mA
µA
mV
µA
µA
k
Unit
Bits
%
%
dB
dB
Vp-p
No. 5691-6/9

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