
May 1994
2
Philips Semiconductors
Preliminary specification
Drive processor for DCC systems
SAA2023
FEATURES
 Operating supply voltage: 4.5  to 5.5 V
 Low power dissipation: 260 mW at 5.0 V
 Single chip digital equalizer, tape formatting and error
correction
 8-bit flash analog-to-digital converter (ADC) for low
symbol error rate
 Two switchable Infinite Impulse-Response (IIR) filter
sections
 10-tap Finite Impulse-Response (FIR) filter per main
data channel, with 8 bit coefficients, identical for all main
channels
 10-tap FIR filter for the AUX channel
 Analog and digital eye outputs
 Interrupt line triggered by internal auxiliary envelope
processing e.g. label, counter, and others
 Robust programmable digital PLL clock extraction unit
 Low power SLEEP mode
 Slew rate limited Electromagnetic Compatibility (EMC)
friendly output
 Digital Compact Cassette (DCC) optimized error
correction
 Programmable symbol synchronization strategy for tape
input data
 Microcontroller control of capstan servo possible during
playback and recording
 Frequency and phase regulation of capstan servo
during playback
 Choice of Dynamic Random Access Memory (DRAM)
and Static Random Access Memory (SRAM) types for
system Random Access Memory (RAM)
 Scratch pad RAM for microcontroller in system RAM
 Integrated interface for Precision Adaptive Sub-band
Coding (PASC) data bus
 Three wire microcontroller ‘L3’ interface
 Protection against invalid auxiliary data
 Seamless joins between recordings.
GENERAL DESCRIPTION
The SAA2023 performs the drive processor function in the
DCC system. This function is built up of digital equalizer,
error correction and tape formatting functions. The digital
equalizer is intended for use with DCC read amplifiers
TDA1318 or TDA1380. The tape formatting and error
correction circuit is intended for use with PASC ICs
SAA2003 and SAA2013, and write amplifiers TDA1319 or
TDA1381.
ORDERING INFORMATION
Note
1.
When using reflow soldering it is recommended that the Dry Packing instructions in the “Quality Reference
Pocketbook”are followed. The pocketbook can be ordered using the code 9398 510 34011.
TYPE NUMBER
PACKAGE
PINS
PIN POSITION
TQFP80
(1)
QFP80
(1)
MATERIAL
CODE
SAA2023H
SAA2023GP
80
80
plastic
plastic
SOT315-1
SOT318-2