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M-8880 Datasheet, PDF (9/13 Pages) Clare, Inc. – M-8880 DTMF Transceiver
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M-8880
Table 12 AC Characteristics (continued)
Parameter
Symbol
Min
Typ*
Max
Microprocessor interface (continued)
Data hold time (read)
f2 to valid data delay (read) (200 pF load)
tDHR
22
tDDR
—
—
—
—
150
Data setup time (write)
Data hold time (write)
Input capacitance, D0—D3
Output capacitance, IRQ/CP
DTMF clock
tDSW
45
tDHW
10
CIN
—
C/OUT
—
—
—
—
—
5
—
5
—
Crystal clock frequency
fC
3.5759
3.5795
3.5831
Clock input rise time (external clock)
tLHCL
—
—
110
Clock input fall time (external clock)
tHLCL
—
—
110
Clock input duty cycle (external clock)
DCCL
40
50
60
Capacitive load, OSC2
CLO
—
—
30
All voltages referenced to unless otherwise noted. VDD = 5.0 V ± 5%; VSS = 0 V; fC = 3.579545 MHz; TA = -40°C to +85°C
*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 W load.
2. Digit sequence consists of all 16 DTMF tones.
3. Tone duration = 40 ms. 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 deviated by ± 1.5% ± 2 Hz.
7. Bandwidth limited (3 kHz) Gaussian noise.
8. The precise dial tone frequencies are 350 and 440 Hz (± 2%).
9. For an error rate 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.
Units
ns
ns
ns
ns
pF
pF
MHz
ns
ns
%
pF
Table 13 Electrical Characteristics - Gain Setting Amplifier
Parameter
Symbol
Min
Typ*
Max
Input leakage current (VSS £ VIN £ VDD)
Input resistance
IIN
—
100
—
RIN
—
10
—
Input offset voltage
Power supply rejection (1 KHz)
VOS
—
25
—
PSRR
—
60
—
Common mode rejection (-3.0 V £ VIN £ 3.0 V)
DC open-loop voltage gain
CMRR
—
60
—
AVOL
—
65
—
Unity gain bandwidth
BW
—
1.5
—
Output voltage swing (RL ³ 100 KΩ to VSS)
Maximum capacitive load, GS
Maximum resistive load, GS
VO
—
4.5
—
CL
—
100
—
RL
—
50
—
Common mode range (no load)
VCM
—
3.0
—
All voltages referenced to unless otherwise noted. VDD = 5.0 V; VSS = 0 V; TA = 25°C
*Typical values are for use as design aids only, and are not guaranteed or subject to production testing.
Units
nA
MΩ
mV
dB
dB
dB
MHz
VPP
pF
KΩ
VPP
40-406-00012, Rev. G
Page 9
www.clare.com
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