MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Order this document
by MC145073/D
Product Preview
Dual 16-Bit Stereo Audio
Sigma-Delta ADC
CMOS
The MC145073 is a dual–channel, 16–bit A/D converter intended for use in
digital audio systems such as multimedia, DCC, DAT, and professional audio
applications. It uses a sigma–delta architecture consisting of a second–order
analog modulator and two stages of digital filtering for each channel. The
analog modulator samples the input signal at 128 times the output data rate,
performs a single–bit quantization, and shapes the quantization noise towards
higher frequencies. Subsequent on–chip digital filters reject most of the shaped
quantization noise and lower the data rate.
Sixteen unique user–selectable interfacing modes make the MC145073
compatible with a multitude of application interfacing requirements. A single 5 V
supply and a power–down mode reduce power supply requirements, making
the part attractive for portable applications.
•
•
•
•
•
•
•
•
•
Single Supply, Operating Voltage Range: 4.5 to 5.5 V
128x OSR Sigma–Delta Modulator
82 dB Typical S/(N+D)
Analog Inputs Can Be Driven as Either Differential or Single–Ended
Clock Input May Be 128x, 256x, or 384x the Output Data Rate
Out–of–Range Input Signals Internally Limited
On–Chip Digital Filters:
5th Order Decimate–by–32 Comb Filter
121 Tap Decimate–by–4 FIR Filter
User–Selectable Digital Filter Transition Bands
Versatile Serial Digital Output Interface:
Configurable as Master or Slave
Data Can Be Either Left– or Right–Justified
Interfaces to DSP56000/1 and TMS320™ DSPs
I2S or Japanese Interface Compatibility
CS5326 Compatible Interface Mode
Multiplexing of Two MC145073s Accommodated
Power–Down Mode Consumption: 2.0 mW
Operating Temperature Range: – 40 to 85°C
AIN(+L)
AIN(–L)
MODULATOR
COMB FILTER
FIR FILTER
24
MC145073
1
DW SUFFIX
SOG PACKAGE
CASE 751E
ORDERING INFORMATION
MC145073DW SOG Package
PIN ASSIGNMENT
AIN(+L)
AIN(–L)
REF
VDD(A)
VSS(A)
SUB
VSS(D)
VDD(D)
FTP
FTP
SYNC
SCLK
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
AIN(+R)
AIN(–R)
VAG
CSEL0
CSEL1
FSEL
ISYNC
ISLAV
IJUST
IDOE
CLK
SDO
•
•
CLK
VOLTAGE
REFERENCE
MODES
IN
AIN(+R)
AIN(–R)
MODULATOR
COMB FILTER
FIR FILTER
CLK DIVIDERS/DRIVER
AND CONTROL LOGIC
DIGITAL
INTERFACE
SERIAL
INTERFACE
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.
TMS320 is a trademark of Texas Instruments.
REV 1
5/97
©
Motorola, Inc. 1997
MOTOROLA
MC145073
1
MOTOROLA [ MOTOROLA, INC ]
