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Details, datasheet, quote on part number:MX631
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Datasheet text preview:
MX631
Features
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DATABULLETIN
LOW VOLTAGE SPM DETECTOR
Detects 12 & 16kHz SPM Frequencies Low Power (3.0 VoltMIN <1.0mA) Operation High Speechband Rejection Properties Tone-Follower and Packet Mode Outputs Applications
·Complex and/or Simple Telephone Systems ·Call-Charge/-Logging Systems
MX631DW 16-Pin SOIC
MX631P 16-Pin PDIP
XTAL/CLOCK XTAL/CLOCK OSCILLATOR XTAL
CLOCK OUT
CLOCK IN CLOCK DIVIDERS
SYSTEM
VSS
VDD TONE FOLLOWER OUTPUT SYSTEM
(12kHz/16kHz)
TONE FOLLOWER LOGIC INPUT AMP
12kHz/16kHz
SIGNAL IN (+) AMP OUT
VBIAS
Figure 1 - Functional Block Diagram
Description
The MX631 is a low-power, system-selectable Subscriber Pulse Metering (SPM) detector that indicates the presence of both 12kHz or 16kHz telephone callcharge frequencies on a telephone line. Deriving its input directly from the telephone line, input amplitude/sensitivities are component adjustable t o the user's national `Must/Must-Not Decode' specifications via an on-chip input amplifier, while the 12kHz and 16kHz frequency limits are accurately d e f i n e d by the use of an external 3.579545MHz telephone-system Xtal or clock-pulse input. The MX631, which demonstrates high 12kHz and 16kHz performance in the presence of both voice and noise, can operate from either a single or differential analog signal input from which it will produce two individual logic outputs: 1. Tone Follower Output - A 'tone-following' logic output producing a "Low" level for the period of a correct decode and a "High" level for a bad decode or NOTONE. 2. Packet (Cumulative Tone) Mode Output - To respond and/or de-respond after a cumulative 40ms of good tone (orNOTONE) in any 48ms period. This process will ignore small fluctuations or fades of a valid frequency input and is available for µProcessor `Wake-Up', Minimum Tone detection, NOTONE indication or transient avoidance. This system (12kHz/16kHz) selectable integrated circuit, which may be line-powered, is available in 16-pin plastic DIP and SOIC surface mount packages.
© 1997 MX·COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc.# 20480087.003 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies
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SIGNAL IN (-)
32 1
LEVEL DETECTOR DIVIDER
PERIOD MEASURE PACKET MODE OUTPUT PACKET TONE LOGIC
+20dB
SYSTEM
Low Voltage SPM Detector
2
MX631
Pin
1
Function
Xtal/Clock : The input to the on-chip clock oscillator; for use with a 3.579545MHz Xtal in conjunction with the Xtal output (see Figure 2). Circuit components are on-chip. Using this mode of clock operation, the Clock Out pin should be connected directly to the Clock In pin. If a clock pulse input is employed to the Clock In pin, this pin must be connected directly to VDD (see Figure 2). Xtal: The output of the on-chip clock oscillator inverter. Clock Out: The buffered output of the on-chip clock oscillator inverter. If a Xtal input is employed this output should be connected directly to the Clock In pin. Clock In: The 3.579545MHz clock pulse input to the internal clock-dividers. In the clock pulse input mode the Xtal/Clock input (pin 1) should be connected to VDD. (See Figure 2.) No internal connection, leave open circuit. No internal connection, leave open circuit. VBIAS: The output of the on-chip analog bias circuitry. Held internally at VDD/2, this pin should be decoupled to VSS (see Figure 2). VSS: Negative supply (GND). Signal In (+): Signal In (-): Amp Out: The positive and negative inputs to, and the output from, the input gain adjusting signal amplifier. Refer to Figure 4 for guidance on setting level sensitivities to national specifications, and the selection of gain adjusting components.
2 3
4
5 6 7
8 9 10 11 12 13
No internal connection, leave open circuit. Tone Follower Output: This output provides a logic "0" (Low) for the period of a detected tone and a logic "1" (High) for NOTONE detection. See Figure 5. Packet Mode Output: A logic output that will be available after a cumulation of 40ms of 'good' tone has been received. This packet tone follower will only respond when a tone frequency of sufficient quality has been received for sufficient time, i.e. a cumulation of 40ms in any 48ms; short tone bursts or breaks will be ignored. This output provides a logic "0" (Low) for a detected tone and a logic "1" (High) for NOTONE detection. See Figure 6. System: The logic input to select device operation to either 12kHz (logic "1" - High) or 16kHz (logic "0" - Low) SPM systems. This input has an internal 1M pullup resistor (12kHz). VDD: Positive supply. A single, stable power supply is required. Critical levels and voltages within the MX631 are dependent upon this supply. This pin should be decoupled to VSS by a capacitor mounted close to the pin. Note that if this device is `line' powered, the resulting supply must be stable. See notes on IC Protection from high and spurious line voltages.
14
15
16
© 1997 MX·COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc.# 20480087.003 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies
Low Voltage SPM Detector
3
MX631
Application Information: External Components
VDD VDD
XTAL/CLOCK
XTAL/CLOCK X1 XTAL CLOCK OUT
VDD
1 2 3 4 5
16
SYSTEM
C1 PACKET MODE OUTPUT
For use with a Clock-Pulse Input - Remove Xtal (X1) - Connect Pin 1 to VDD - Remove link (Pins 3-4) - Input clock pulses to CLOCK IN
15 14
TONE FOLLOWER OUTPUT
CLOCK IN
CLOCK IN
MX631
13 12 11 10
VBIAS VSS
6 7 8
AMP OUT SIGNAL IN (-) SIGNAL IN (+)
R1 C3 R2 R3 C4
9
R4
C2
Figure 2 - Recommended External Components - Differential Input Mode
Component R1 R2 R3 R4 C1 C2 C3 C4 X1 Value R FEEDBACK RIN (-) RIN (+) R BIAS 1.0µF ±20% 1.0µF ±20% C IN(-) CIN(+) 3.579545MHz
External Components 1. The values of the Input Amp gain components illustrated are calculated using the Input Gain Calculation Graph (Figure 4). When calculating input gain components, for correct operation, it is recommended that the values of resistors R1 and R4 do not go below 100k. 2. Refer to following pages for advice on IC Protection from high and spurious line voltages.
Differential Input
Common Mode Input
INPUT AMP
INPUT AMP
Ring (b)
MX631
VBIAS
VBIAS
Figure 3 - Example Input Configurations
© 1997 MX·COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc.# 20480087.003 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies
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MX631
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Tip (a)
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