MC145076 Datasheet, PDF (1/8 Pages) Motorola, Inc – MC 145076 Stereo Audio FIR Smoothing Filter

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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MC145076 Stereo Audio FIR
Smoothing Filter
CMOS
The MC145076 is a combination re–clocking and smoothing filter designed
especially for the MC145074 Stereo Audio DAC. Its versatility however, allows
it to be used with any single bit–stream data converter to provide output
reconstruction filtering, and to improve performance by restoring pulse shape
integrity. The MC145076 provides a well controlled, filtered output that can be
used directly, or with a current summing operational amplifier.
The MC145076 is intended to be one half of a two–chip solution for serial bit
steam DACs. The analog filtering function of the MC145076 eases the digital
filtering requirements at the input to the digital noise shaping modulator, and
eliminates the need for precision analog output filtering capacitors, resulting in
lower overall system cost. The MC145076 pulse shape restoration frees the
designer from analog pitfalls that can impact performance, thereby lowering the
risk of new product development with a sigma–delta DAC.
• Single–Ended Stereo Outputs Require no Additional Smoothing Filters
• 86 dB S/D, 96 dB S/N with MC145074 @ 192 x OSR Single Ended
• > 100 dB S/(N+D) @ 256 OSR, Differential Mode
• 18.5 MHz Maximum Serial Data Input Rate
• – 80 dB Cross Channel Interference
• 72–Tap FIR with > 40 dB Alias Filtering
• Operating Temperature Range: – 40 to + 85_C
• Buffered Data Clock Output for Ease of Data Generation
• 16–Pin Narrow Body SOIC Package
• Single Supply Operation: + 5 V
Order this document
by MC145076/D
MC145076
16
1
D SUFFIX
16–PIN SOG
CASE 751B–05
ORDERING INFORMATION
MC145076D SOG Package
PIN ASSIGNMENT
VDDA 1
Xin 2
BIAS 3
DIV2 4
DIL 5
DIR 6
TEST 7
VDDD 8
16 Xout
15 GND
14 IOL
13 GND
12 GND
11 IOR
10 GND
9 CLKOUT
DIL ⁵
DIR ⁶
DIV2 ⁴
TEST ⁷
Xout ¹⁶
Xin ²
VDDA ¹
VDDD ⁸
GND ¹⁰
GND ¹⁵
BIAS ³
TIMING
AND
CONTROL
LOGIC
LEFT CHOP
RIGHT CHOP
LEFT 144 SERIAL SHIFT REG.
14
IOL
144 TAP HAMMING
C (1)
WINDOW _{C (144)}
COEFFICIENTS
13
GND
9 _CLKOUT
RIGHT 144 SERIAL SHIFT REG.
11
IOR
144 TAP HAMMING
C (1)
WINDOW _{C (144)}
COEFFICIENTS
12
GND
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.
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MC145076
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