CM8888 Datasheet, PDF (3/13 Pages) California Micro Devices Corp – CMOS INTEGRATED DTMF TRANCEIVER

CALIFORNIA MICRO DEVICES
CM8888/8888-2
AC Characteristics: All voltages referenced to V_SS, V_DD = 5.0V + 5%, fc = 3.579545 MHz,
T_A = -40°C to +85°C unless otherwise noted.
Parameter
Receive Signal Conditions
Valid Input Signal Levels
(Each Tone of Composite Signal;
Notes 1,2,3,4,5,6,9)
Positive Twist Accept (Notes 2,3,6,9)
Negative Twist Accept (Notes 2,3,6,9)
Freq. Deviation Accept Limit (Notes 2,3,5,9)
Freq. Deviation Reject Limit (Notes 2,3,5)
Third Tone Tolerance ( 2,3,4,5,9,10)
Noise Tolerance ( 2,3,4,5,7,9,10)
Dial Tone Tolerance ( 2,3,4,5,8,9,11)
Lower Frequency (@ -25 dBm) ACCEPT
Upper Frequency (@ -25 dBm) ACCEPT
Lower Frequency (@ -25 dBm) ACCEPT
Upper Frequency (@ -25 dBm) ACCEPT
Receive Timing
Tone Present Detection Time
Tone Absent Detection Time
Min Tone Duration Accept (Ref. Fig 9)
Max Tone Duration Reject (Ref. Fig 9)
Min. Interdigit Pause Accept (Ref. Fig 9)
Max. Interdigit Pause Reject (Ref. Fig 9)
Propagation Delay (St to b3)
Propagation Delay (St to RXO - RX3)
Transmit Timing
Tone Burst Duration (DTMF Mode)
Tone Pause Duration (DTMF Mode)
Tone Burst Duration
(Extended, Call Process Mode)
Tone Pause Duration
(Extended, Call Process Mode)
Tone Output
High Group Output Level (R_L = 10KΩ)
Low Group Output Level (R_L= 10KΩ)
Pre-emphasis (R_L = 10KΩ)
Output Distortion
(R_L = 10K Ω 3.4 KHz Bandwidth)
Frequency Deviation (f = 3.5795 MHz)
Output Load Resistance
AC CHARACTERISTICS
Symbol
Min
-29
27.5
±1.5%
±2Hz
±3.5%
F_LA
F_HA
F_LR
F_HR
t_DP
5
t_DA
0.5
t_REC
t_REC
20
t_ID
t_DO
20
t_PSt_b3
t_PSt_RX
t_BST
50
t_PS
50
t_BSTE
100
t_PSE
100
V_HOUT
-6.1
V_LOUT
-8.1
dB_P
0
THD
f_D
R_LT
10
Typ
-16
-16
22
320
510
290
540
11
4
13
8
2
-25
±0.7
Max
+1
869
10
10
14
8.5
40
40
52
52
104
104
-2.1
-4.1
3
±1.5
50
Units
dBm
mV_RMS
dB
dB
Nom.
Nom.
dB
dB
dB
Hz
Hz
Hz
Hz
mS
mS
mS
mS
mS
µS
µS
µS
mS
mS
mS
mS
dBm
dBm
dB
dB
%
KΩ
© 2000 California Micro Devices Corp. All rights reserved.
5/00
215 Topaz Street, Milpitas, California 95035 Tel: [phone] Fax: [phone] www.calmicro.com
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