LC7851 Schematic - Sanyo Semicon Device

LC7851 Schematic ( PDF Datasheet ) - Sanyo Semicon Device

Teilenummer	LC7851
Beschreibung	QPSK Demodulation and Audio Signal-Processing IC for Satellite Broadcast Reception
Hersteller	Sanyo Semicon Device
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Gesamt 9 Seiten 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 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 kΩ Unit Bits % % dB dB Vp-p No. 5691-6/9 6 Page
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Besondere Datenblatt

Teilenummer	Beschreibung	Hersteller
LC7851	QPSK Demodulation and Audio Signal-Processing IC for Satellite Broadcast Reception	Sanyo Semicon Device
LC7851E	QPSK Demodulation and Audio Signal-Processing IC for Satellite Broadcast Reception	Sanyo Semicon Device

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