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Número de pieza | M-88L70-01P | |
Descripción | 3V DTMF Receiver | |
Fabricantes | Clare Inc. | |
Logotipo | ||
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No Preview Available ! M-88L70
3V DTMF Receiver
Features
• Operates between 2.7 and 3.6 volts
• Low power consumption
• Power-down mode
• Inhibit mode
• Central office quality and performance
• Inexpensive 3.58 MHz time base
• Adjustable acquisition and release times
• Dial tone suppression
• Functionally compatible with Clare’s M-8870
Applications
• Telephone switch equipment
• Mobile radio
• Remote control
• Paging systems
• PCMCIA
• Portable TAD
• Remote data entry
Description
The M-88L70 monolithic DTMF receiver offers small size,
low power consumption and high performance, with 3 volt
operation. Its architecture consists of a bandsplit filter
section, which separates the high and low group tones,
followed by a digital counting section which verifies the
frequency and duration of the received tones before
passing the corresponding code to the output bus.
Ordering Information
Part #
M-88L70-01P
M-88L70-01S
M-88L70-01T
Description
18-pin plastic DIP
18-pin SOIC
18-pin SOIC, Tape and Reel
Figure 1 Pin Connections
The M-88L70 is a full DTMF Receiver that integrates
both bandsplit filter and decoder functions into a single
18-pin DIP or SOIC package. Manufactured using
CMOS process technology, the M-88L70 offers low
power consumption (18 mW max), precise data handling
and 3V operation. Its filter section uses switched capaci-
tor technology for both the high and low group filters and
for dial tone rejection. Its decoder uses digital counting
techniques to detect and decode all 16 DTMF tone pairs
into a 4-bit code. External component count is minimized
by provision of an on-chip differential input amplifier,
clock generator, and latched tri-state interface bus.
Minimal external components required include a low-cost
3.579545 MHz color burst crystal, a timing resistor, and a
timing capacitor.
Figure 2 Block Diagram
DS-M88L70-R1
www.clare.com
1
1 page M-88L70
Table 5 Operating Characteristics - Gain Setting Amplifier
PARAMETER
SYMBOL
MIN
TYP
Input leakage current
Input resistance
Input offset voltage
Power supply rejection
IN
RIN
VOS
PSRR
- 100
- 10
- 15
50 60
Common mode rejection
CMRR 40 60
DC open loop voltage gain
Open loop unity gain bandwidth
Output voltage swing
Tolerable capacitive load (GS)
Tolerable resistive load (GS)
Common mode range
AVOL 32 65
fC 0.3 1.0
VO - 2.2
CL - -
RL 50 -
VCM - 1.5
All voltages referenced to VSS unless otherwise noted. VDD = 3.0 V +20%/-10%, VSS = 0 V, TA = -40˚C to + +85˚C
MAX UNITS
- nA
- MΩ
25 mV
- dB
- dB
- dB
- MHz
- VP-P
100 pF
- kΩ
- V P-P
TEST CONDITIONS
VSS < VIN < VDD
1 kHz
-3.0V < VIN < 3.0V
RL 3 100 kΩ to VSS
No load
Table 6 AC Characteristics
PARAMETER
SYMBOL
MIN
TYP MAX
UNITS
Valid input signal levels
- -36 - -6.4 dBm
(each tone of composite signal)
- 12.3 - 370 mVRMS
Positive twist accept
-
-
-6
dB
Negative twist accept
-
-
-6
dB
Frequency deviation accept limit
- - - 1.5% ±2 Hz Nom.
Frequency deviation reject limit
- ±3.5% -
- Nom.
Third tone tolerance
- - -16 - dB
Noise tolerance
- - -12 - dB
Dial tone tolerance
- - +22 - dB
Tone present detection time
Tone absent detection time
Minimum tone duration accept
Maximum tone duration reject
Minimum interdigit pause accept
Maximum interdigit pause reject
Propagation delay (St to Q)
Propagation delay (St to StD)
Output data setup (Q to StD)
Propagation delay (OE to Q), enable
Propagation delay (OE to Q), disable
Crystal clock frequency
Clock output (OSC2), capacitive load
tDP 5
8 14
tDA 0.5
3 8.5
tREC - 40
tREC 20
--
tID -
- 40
tDO 20
--
tPQ - 13 -
tPStD
-
8-
tQStD
-
3.4 -
tPTE - 200 -
tPTD - 500 -
fCLK
3.5759
3.5795 3.5831
CLO -
- 30
All voltages referenced to VSS unless otherwise noted. For typical values VDD = 3.0 V, VSS = 0 V, TA = -40˚C to +85˚C, fCLK = 3.579545 MHz.
1. dBm = decibels above or below a reference power of 1 mW into a 600 Ω 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, measured at GS.
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 and 440 Hz) ± 2%.
8. For an error rate of better than 1 in 10,000.
9. Referenced to lowest level frequency component in DTMF signal.
10. Minimum signal acceptance level is measured with specified maximum frequency deviation.
11. Input pins defined as IN+, IN-, and OE.
12. External voltage source used to bias VREF.
13. This parameter also applies to a third tone injected onto the power supply.
14. Referenced to Figure 4. Input DTMF tone level at -28 dBm.
ms
ms
ms
ms
ms
ms
µs
µs
µs
ns
ns
MHz
pF
Notes:
Rev. 1 www.clare.com
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
See Figure 8
User adjustable (see Figures 3
and Figure 5)
OE = VDD
RL = 10kΩ, CL = 50 pF
5
5 Page |
Páginas | Total 8 Páginas | |
PDF Descargar | [ Datasheet M-88L70-01P.PDF ] |
Número de pieza | Descripción | Fabricantes |
M-88L70-01P | 3V DTMF Receiver | Clare Inc. |
M-88L70-01S | 3V DTMF Receiver | Clare Inc. |
M-88L70-01T | 3V DTMF Receiver | Clare Inc. |
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