Delta Modulation CODEC
13
MX629
Notes
Min.
Typ.
Max.
Units
Group Delay Distrotion
(1000Hz-2600Hz)
(600Hz-2800Hz)
4
6
6
6
450
750
1.5
ꢄs
ꢄs
(500Hz-3000Hz)
ms
kHz
Xtal/clock Frequency
1024
Notes:
1. Dynamic characteristics are specified at 5.0V unless otherwise specified.
2. All logic inputs except Encoder and Decoder Data clocks
3. For and encoder/Decoder combination, Insertion loss contributed by a single component is half this figure.
4. Driven with a source impedance of <100ꢂ.
5. Recommended values – See Figures 4, 5, 6, and 7.
6. Group Delay Distortion for the full codec is relative to the delay with and 820Hz, -20dB signal at the
encoder input
7. An Emitter Follower output stage.
8. 4V = 80%V , 3.5V = 70%V , 1.5V = 30%V , 1V = 20%V
DD
DD
DD
DD
9. Analog Voltage Levels used: 0dBmO = 489mV
= -4dBm = 0dB. –15dBmO = 87mV . –20dBmO =
RMS
RMS
49mV
= -24dBm.
RMS
6.1.4 TIMING
Serial Bus Timings (See Figure 14)
Min.
1.0
1.0
0
Typ.
Max.
Units
t
t
t
t
t
t
t
t
t
t
Clock 1 pulse width
Clock 0 pulse width
Clock rise time
ꢄs
ꢄs
ns
ns
ns
ns
ꢄs
ns
ns
ns
CH
CL
IR
100
100
Clock fall time
IF
Data set-up time
Data hold time
450
SU
H
600
+t
Data true time
1.5
750
100
100
SU
H
Clock to output delay time
Data rise time
PCO
DR
Data fall time
DF
Xtal input frequency = 1.024MHz
ꢀ1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480190.001
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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CMLMICRO [ CML MICROCIRCUITS ]
