MOTOROLA, INC. 1997
5/7/97
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Current Information@www.mot.com/ADC
Product Preview
OFDM Demodulator
The MC92308 is a Orthogonal Frequency Division Multiplex Demodulator for 2K
transmission mode according to the ETSI specification for digital terrestrial broadcast-
ing (PR ETS 300744). The MC92308 contains all the functionality required to demod-
ulate the information transmitted in one UHF channel.
Feature Summary
Usable for 8MHz/7MHz/6MHz channels by adjusting the clock rate
Digital I/Q separation on-chip
Supports QPSK, 16-QAM and 64-QAM
Supports all guard interval lengths (1/32, 1/16, 1/8, 1/4)
Accepts 8-bit TTL-compatible twos-complement data input
Provides the required control signals for Automatic Gain Control and ADC clock
frequency control
Performs channel estimation and correction by using the embedded pilot carriers
I
2
C serial bus compatible interface (M-Bus) and parallel interface for external pro-
gramming and control of the device
Transmission Parameter Signalling is decoded and made available to the system
controller via M-Bus or parallel microprocessor interface
Companion to DVB compliant 2K-FFT Processor (MC92307)
Output interface for DBV compliant FEC
Fast synchronization at power-on and after channel switch
Low implementation margin
0.5
CMOS Process at 3.3V
Figure 1. OFDM Frontend Processing
Ordering Information
Device
MC92308CI
Package
160MQUAD
RESB
CLK
CLKCTLN
MBUS[1:0]
CLKCTLP
FFTDI[11:0]
SYMSYNC
MC92308
ADCDATA[7:0]
CLKEN18
AGCCTLN
AGCCTLP
FFTDO[7:0]
FFTSTART
G2DATA[2:0]
G1DATA[2:0]
FECCLK
DVALID
This document contains information on a product under development.
Motorola reserves the right to change or discontinue this product without notice.
2
Rev.1.4
MOTOROLA
MC92308
VSS
VSS
VSS
VDD
VDD
VSS
FFTDO7
FFTDO6
FFTDO5
VDD
FFTDO4
FFTDO3
FFTDO2
VSS
FFTDO1
FFTDO0
FFTST
AR
T
SYMSYNC
FFTDI11
VDD
VSS
FFTDI10
FFTDI9
FFTDI8
FFTDI7
VDD
FFTDI6
FFTDI5
FFTDI4
FFTDI3
VSS
FFTDI2
FFTDI1
FFTDI0
VDD
VDD
VSS
VSS
VDD
VDD
MADDR4
MADDR5
VDD
VSS
VDD
VSS
MD
A
T
A0
MD
A
T
A1
MD
A
T
A2
MD
A
T
A3
MD
A
T
A4
MD
A
T
A5
VDD
VSS
MD
A
T
A6
MD
A
T
A7
MCSB
MWRB
MRDB
VDD
VSS
MB
USID0
MB
USID1
MB
USID2
MB
USID3
MSCL
MSD
A
VDD
VSS
MSEL
FECV
ALID
FECCLK
G1D
A
T
A0
G1D
A
T
A1
G1D
A
T
A2
VDD
VSS
G2D
A
T
A0
G2D
A
T
A1
G2D
A
T
A2
ADCDATA0
ADCDATA1
ADCDATA2
ADCDATA3
VDD
VSS
ADCDATA4
ADCDATA5
ADCDATA6
ADCDATA7
VDD
VSS
VDD
VSS
CLKEN18
CLK
VDD
VSS
VDD
CLKCTLP
CLKCTLN
VDD
VSS
AGCCTLP
AGCCTLN
VDD
VSS
VSS
VSS
VDD
VDD
VDD
VSS
VSS
VDD
VSS
MADDR0
MADDR1
MADDR2
MADDR3
reserved (VSS)
reserved (VSS)
reserved (VSS)
VSS
VDD
reserved (VSS)
reserved (VSS)
reserved (VSS)
reserved (VSS)
reserved (VSS)
reserved (VSS)
VSS
VDD
reserved (VSS)
reserved (VSS)
RESB
VSS
VDD
reserved (open)
reserved (open)
reserved (open)
reserved (open)
reserved (open)
reserved (open)
VSS
VDD
reserved (open)
reserved (open)
reserved (open)
VSS
VDD
reserved (open)
reserved (open)
VSS
VDD
reserved (open)
reserved (open)
reserved (open)
VSS
VDD
160MQUAD
Table 1. MC92308 Pin Description
SIGNAL
FUNCTIONALITY
TYPE
POLTY
CLK
Common clock input (36.57 MHz)
TTL - IN
high
RESB
Reset (synchronous)
TTL - IN
low
CLKEN18
ADC data strobe
TTL - IN
high
ADCDATA[7:0]
Input for samples from ADC
TTL - IN
high
CLKCTLP
ADC clock synchronization loop (+)
TTL - OUT
high
CLKCTLN
ADC clock synchronization loop (-)
TTL - OUT
low
AGCCTLP
Analog AGC loop (+)
TTL - OUT
high
AGCCTLN
Analog AGC loop (-)
TTL - OUT
low
FFTSTART
FFT start signal
TTL - OUT
high
FFTDO[7:0]
Complex data output to FFT (muxed)
TTL - OUT
high
MC92308
MOTOROLA
Rev.1.4
3
Notes:
_________________________________________________________
_________________________________________________________
_________________________________________________________
_________________________________________________________
_________________________________________________________
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FFTDI[11:0]
Complex data input from FFT (muxed)
TTL - IN
high
SYMSYNC
Symbol start signal from FFT
TTL - IN
high
G1DATA[2:0]
Data output for Viterbi decoder
TTL - OUT
high
G2DATA[2:0]
Data output for Viterbi decoder
TTL - OUT
high
FECCLK
Clock for Viterbi Decoder (free running)
TTL - OUT
high
FECDVALID
Data valid signal for Viterbi Decoder
TTL - OUT
high
MSDA
I
2
C compatible control bus, data pin
TTL - OD
-
MSCL
I
2
C compatible control bus, clock pin
TTL - IN
high
MBUSID[3:0]]
I
2
C compatible control bus, variable ID selector
TTL - IN
high
MSEL
Enable Microprocessor parallel interface
TTL - IN
high
MDATA[7:0]
Microprocessor interface bidirectional databus
TTL - bidir
high
MADDR[5:0]
Microprocessor interface address bus
TTL - IN
high
MCSB
Microprocessor interface chip select
TTL - IN
low
MWRB
Microprocessor interface write enable
TTL - IN
low
MRDB
Microprocessor interface read enable
TTL - IN
low
Table 1. MC92308 Pin Description (Continued)
SIGNAL
FUNCTIONALITY
TYPE
POLTY
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the
suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including
"Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the
rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold
Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney
fees arising out of directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
Motorola was negligent regarding the design or manufacture of the part. Motorola and
are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Affirmative Action Employer.
MC92308
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