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CALIFORNIA MICRO DEVICES
CM8888/8888-2
CMOS INTEGRATED DTMF TRANCEIVER
Fea tur es
• Advanced CMOS technology for low power
consumption and increased noise immunity
• Complete DTMF
• Transmitter/Receiver
• Standard 8051, 8086/8 microprocessor port
• Central office quality and performance
• Adjustable guard time
• Automatic tone burst mode
• Call progress mode
• Single +5 volt power supply
• 20-pin DIP, 20-pin DIP EIAJ, 20-pin SOIC,
28-pin PLCC packages
• 2 MHz microprocessor port operation
Applications
• Paging systems
• Repeater systems/mobile radio
• Interconnect dialers
• PABX systems
• Computer systems
• Fax machines
• Pay telephones
• Credit card verification
Product Description
The CAMD CM8888/8888-2 is a fully integrated DTMF Transceiver, featuring adjustable guard time, automatic tone burst
mode, call progress mode, and a fully compatible 8051, 8086/8 microprocessor interface. The CM8888/8888-2 is
manufactured using state-of-the-art advanced CMOS technology for low power consumption and precise data handling.
The CM8888/8888-2 is based on the industry standard CM8870 DTMF Receiver, while the transmitter utilizes a switched-
capacitor D/A converter for low distortion, highly accurate DTMF signaling. Internal counters provide an automatic tone
burst mode which allows tone bursts to be transmitted with precise timing. A call progress filter can be selected by an
external microprocessor for analyzing call progress tones. The CM8888-2 is electrically equivalent to the CM8888 but does
not include the call progress function.
Block Diagram
All trademarks are the property of their respective holders.
© 2000 California Micro Devices Corp. All rights reserved.
5/00 215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
C0400798D
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CALIFORNIA MICRO DEVICES
CM8888/8888-2
Absolute Maximum Ratings: (See Note)
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Value
Power Supply Voltage
(VD D -VS S )
Voltage on any Pin
Current on any Pin
Operating Temperature
Storage Temperature
VDD 6.0V Max
Vdc -0.3V to VDD+0.3V
IDD 10mA Max
TA -40°C to +85°C
TS -65°C to +150°C
DC Characteristics: All voltages referenced to VSS, VDD = 5.0V + 5%,
fc = 3.579545 MHz, TA = -40°C to +85°C unless otherwise noted.
DC CHARACTERISTICS
Parameter
Symbol
Min
Operating Supply Voltage
Operating Supply Current
Power Consumption
Inputs
VDD 4.75
IDD
PO
High Level Input Voltage OSCI
Low Level Input Voltage OSCI
Input Impedance, (@ 1KHz) IN+IN-
Steering Threshold Voltage (V DD=5.0V)
Outputs
VIHO
VILO
RIN
VTst
3.5
2.2
High Level Output Voltage (No Load) OSC2
Low Level Output Voltage (No Load) OSC2
Output Leakage Current (VOH=2..4V) IRQ
VREF Output Voltage (No Load)
VREF Output Resistance
VOHO
VOLO
IOZ
VREF
ROR
4.9
2.4
Data Bus (DO-D3, RD, WR, RSO, CS)
Low Level Input Voltage
High Level Input Voltage
Low Level Output Voltage (I OL=1.6mA)
High Level Input Voltage (I OH=400µA)
Input Leakage Current (VIN=0.4 to 2.4V) I
VIL
VIH 2.0
VOL
VOH 2.4
IIZ
This device contains input protection
against damage due to high static voltages
or electric fields; however, precautions
should be taken to avoid application of
voltages higher than the maximum rating.
Note:
Exceeding these ratings may cause
permanent damage, functional
operation under these conditions is
not implied.
Typ*
5.0
10
10.0
2.3
1.0
Max
5.25
52.5
1.5
2.5
0.1
10.0
2.7
1
0.8
0.4
10.0
Units
V
mA
m
V
V
M
V
V
V
µA
V
K
V
V
V
V
µA
Operating Characteristics - Gain Setting Amplifier: All voltages referenced to VSS, VDD = 5.0V + 5%,
fc = 3.579545 MHz, TA = -40°C to +85°C unless otherwise noted.
OPERATING CHARACTERISTICS
Parameter
Symbol
Min
Typ
Max
Units
Input Leakage Current( VSS < VIN < VDD)
II N
100 nA
Input Resistance
RIN 10 M
Input Offset Voltage
VOS 25 mV
Power Supply Rejection (1 KHz)
PSRR
60
dB
Common Mode Rejection(-3.0V < VIN <3.0V)
CMRR
60
dB
DC Open Loop Voltage Gain AVOL 65 dB
Unity Gain Bandwidth
BW 1.5 MHz
Output Voltage Swing ( RL> 100Kto VSS)
VO
4.5 Vpp
Maximum Capacitive Load (GS)
CL
100 pF
Maximum Resistive Load (GS)
RL
50 K
Common Mode Range (No Load)
Vcm
3.0
Vpp
©2000 California Micro Devices Corp. All rights reserved.
2 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
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CALIFORNIA MICRO DEVICES
CM8888/8888-2
AC Characteristics: All voltages referenced to VSS, VDD = 5.0V + 5%, fc = 3.579545 MHz,
TA = -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 (RL = 10K)
Low Group Output Level (RL= 10K)
Pre-emphasis (RL = 10K)
Output Distortion
(RL = 10K 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%
FLA
FHA
FLR
FHR
tDP
tDA
tREC
tREC
tID
tDO
tPStb3
tPStRX
tBST
tPS
tBSTE
tPSE
VHOUT
VLOUT
dBP
THD
fD
RLT
5
0.5
20
20
50
50
100
100
-6.1
-8.1
0
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
mVRMS
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
%
K
© 2000 California Micro Devices Corp. All rights reserved.
5/00 215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
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CALIFORNIA MICRO DEVICES
CM8888/8888-2
AC Characteristics: VDD = 5.0V + 5%, VSS = OV, TA = -40°C to +85°C
Parameter
Microprocessor Interface
RD, WR, Low Pulse Width
RD, WR, High Pulse Width
RD, WR, Rise and Fall
Address Hold
Address Setup
Read Data Hold
RD to Valid Data Delay (200 pF Load)
Write Data Setup
Write Data Hold
Input Capacitance DO-D3
Output Capacitance IRQ CP
DTMF Clock
Crystal Clock Frequency
Clock Input Rise Time (External Clk.)
Clock Input Fall Time (External Clk.)
Clock Input Duty Cycle (External Clk.)
Capacitive Load OSC2
AC CHARACTERISTICS
Symbol
Min
tCL
tCH
tR, tF
tAH
tAS
tDHR
tDDR
tDSW
tDHW
tCIN
tOUT
fc
tLHCL
tLHCL
D CCL
CLO
200
180
10
23
22
45
10
3.5759
40
Typ*
5
5
3.5795
50
Max
25
150
3.5831
110
110
60
30
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
pF
pF
MHz
ns
ns
%
pF
* Typical values are for use as design aids only, and are not guaranteed or subject to production testing.
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. The tone pair is deviate by + 1.5% + 2Hz.
7. Bandwidth limited (3 KHz) Gaussian Noise.
8. The precise dial tone frequencies are 350 and 440 Hz (+2%)
9. For an error date of less than 1 in 10,000.
10. Referenced to the lowest amplitude tone in the DTMF signal.
11. Referenced to the minimum valid accept level.
©2000 California Micro Devices Corp. All rights reserved.
4 215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
5/00

No Preview Available !

CALIFORNIA MICRO DEVICES
CM8888/8888-2
© 2000 California Micro Devices Corp. All rights reserved.
5/00 215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
5