CALIFORNIA MICRO DEVICES
CM88L70/70C
AC Characteristics:
All voltages referenced to V
SS
, V
DD
=3.0V + 20% / -10%, T
A
=-40°C to +85°C, f
CLK
=3.579545 MHz
using test circuit (Fig. 1) unless otherwise noted.
AC CHARACTERISTICS
Parameter
Valid Input Signal Levels
(each tone of composite signal)
Positive Twist Accept
Negative Twist Accept
Freq. D eviation Accept Limit
Freq. D eviation Reject Limit
Third Tone Tolerance
Noise Tolerance
D ial Tone Tolerance
Tone Present D etection Time
Tone Absent D etection Time
Min Tone D uration Accept
Max Tone D uration Reject
Min. Interdigit Pause Accept
Max. Interdigit Pause Reject
Propagation D elay (St to Q)
Propagation D elay (St to StD )
Output D ata Set Up (Q to StD )
Propagation D elay (TOE to Q)
Crystal/Clock Frequency
Clock Output (OSC 2)
Capacitive
L o ad
Enable
D isable
t
DP
t
DA
t
R EC
t
R EC
t
ID
t
DO
t
PQ
t
PS
t
D
t
QS
t
D
t
PTE
t
PTD
f
CL K
C
LO
3.5759
20
13
8
3.4
200
50 0
3.5795
3.5831
30
20
40
5
0.5
±3.5%
-16
-12
+22
8
3
14
8.5
40
Symbol
Min
-36
12.3
Typ
Max
-6.4
370
6
6
1.5%±2Hz
Units
dB m
mV
RMS
dB
dB
Nom.
Nom.
dB
dB
dB
mS
mS
mS
mS
mS
µS
µS
µS
µS
nS
nS
MHz
pF
Notes
1,2,3,4,5,8
2,3,5,8,10
2,3,5
2,3,4,5,8,9,13,14
2,3,4,5,6,8,9
2,3,4,5,7,8,9
Refer to
Timing D iagram
(User Adjustable)
Times shown are
obtained with
circuit in Fig. 1)
TOE = V
DD
R
L
= 10 K
Ω
C
L
= 50pF
Notes:
1. dBm = decibels above or below a reference power
of 1 mW into a 600 ohm load.
2. Digit sequence consists of all 16 DTMF tones.
3. Tone duration = 40mS. Tone pause = 40 mS.
4. Nominal DTMF frequencies are used.
5. Both tones in the composite signal have
an equal amplitude.
6. Bandwidth limited (0 to 3 KHz) Gaussian Noise.
7. The precise dial tone frequencies are
(350 Hz and 440 Hz) ±2%.
8. For an error rate of better than 1 in 10,000
9.
10.
11.
12.
13.
14.
Referenced to lowest level frequency component
in DTMF signal.
Minimum signal acceptance level is measured with
specified maximum frequency deviation.
Input pins defined as IN+, IN-, and TOE.
External voltage source used to bias V
REF
.
This parameter also applies to a third tone injected onto
the power supply.
Referenced to Figure 1. Input DTMF tone level
at -28 dBm.
© 2000 California Micro Devices Corp. All rights reserved.
6/16/2000
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
3
CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
