M-8880 Datasheet, PDF (8/13 Pages) Clare, Inc. – M-8880 DTMF Transceiver

M-8880
Table 12 AC Characteristics
PARAMETER
Receive signal conditions
Valid input signal levels
(each tone of composite signal; Notes 1, 2, 3, 5, 6, 9)
Positive twist accept (Notes 2, 3, 6, 9)
Negative twist accept (Notes 2, 3, 6, 9)
Frequency deviation accept (Notes 2, 3, 5, 9)
Frequency deviation reject (Notes 2, 3, 5)
Third tone tolerance (Notes 2, 3, 4, 5, 9, 10)
Noise tolerance (Notes 2, 3, 4, 5, 7, 9, 10)
Dial tone tolerance (Notes 2, 3, 4, 5, 8, 9, 11)
Call progress
Lower frequency (@ -25 dBm) accept
Upper frequency (@ -25 dBm) accept
Lower frequency (@ -25 dBm) reject
Upper frequency (@ -25 dBm) reject
Receive timing
Tone present detect time
Tone absent detect time
Tone duration accept (ref. Figure 12)
Tone duration reject (ref. Figure 12)
Interdigit pause accept (ref. Figure 12)
Interdigit pause reject (ref. Figure 12)
Delay St to b3
Delay St to RX_O—RX₃
Transmit timing
Tone burst duration (DTMF mode)
Tone pause duration (DTMF mode)
Tone burst duration (extended, call progress mode)
Tone pause duration (extended, call progress mode)
Tone output
High group output level (R_L = 10 kΩ)
Low group output level (R_L = 10 kW)
Pre-emphasis (R_L = 10 kW)
Output distortion (R_L = 10 kΩ, 3.4 kHz bandwidth)
Frequency deviation (f = 3.5795 MHz)
Output load resistance
Microprocessor interface
φ 2 cycle period
φ2 high pulse width
φ2 low pulse width
φ2 rise and fall time
Address, R/W hold time
Address, R/W setup time (prior to φ2)
SYMBOL
f_LA
f_HA
f_LR
f_HR
t_DP
t_DA
t_REC
t_REC
t_ID
t_DO
t_PStb3
t_PStRX
t_BST
t_PS
t_BSTE
t_PSE
V_HOUT
V_LOUT
dB_P
THD
f_D
R_LT
t_CYC
t_CH
t_CL
t_R, t_F
t_AH, t_RWH
t_AS, t_RWS
MIN
-29
27.5
—
—
± 1.5% ± 2 Hz
± 3.5%
—
—
—
—
—
—
—
5
0.5
—
20
—
20
—
—
50
50
100
100
-6.1
-8.1
0
—
—
10
0.5
200
180
—
10
23
TYP*
—
—
—
—
-16
-12
+22
320
510
290
540
11
4
—
—
—
—
13
8
—
—
—
—
—
—
2
-25
± 0.7
—
—
—
—
—
—
—
MAX
+1
869
6
6
—
—
—
—
—
—
—
—
—
14
8.5
40
—
40
—
—
—
52
52
104
104
-2.1
-4.1
3
—
± 1.5
50
—
—
25
—
—
UNITS
dBm
mV_RMS
dB
dB
Nom.
Nom.
dB
dB
dB
Hz
Hz
Hz
Hz
ms
ms
ms
ms
ms
ms
µs
µs
ms
ms
ms
ms
dBm
dBm
dB
dB
%
kΩ
µs
ns
ns
ns
ns
ns
40-406-00012, Rev. G
Page 8
www.clare.com