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CML Semiconductor Products
PRODUCT INFORMATION
FX641
Features Two (12kHz/16kHz) SPM Detectors on a Single Chip Detects 12kHz and 16kHz SPM Frequencies
Dual Subscriber Private Metering (SPM) Detector
Publication D/641/4 February 2001 Provisional Issue
Selectable Tone Follower or Packet Mode Outputs High Speech-Band Rejection Properties "Output Enable" Multiplexing Facility Call-Charge Applications on PABX Line Cards
VDD CLOCK IN CLOCK DIVIDERS VBIAS
INTERNAL CLOCKS
Xtal Accuracy; Stable Frequency Limits "Controlled" (C) and "Fixed" Signal Sensitivity Modes
CLOCK OUT XTAL/CLOCK XTAL/CLOCK GENERATOR
XTAL
BUFFER
VSS
12kHz/16kHz SYSTEM Ch 1 COMPARATOR TONE FOLLOWER MODE
Ch 1 AMP OUT Ch1 AMP IN (-)
Ch 1 OUTPUT
Ch1 AMP IN (+)
Ch 1 INPUT AMPLIFIER
GAIN ADJUST
INTERNAL COMPARATOR THRESHOLD
PRESET LEVEL
CHIP SELECT
SERIAL DATA
SERIAL INPUT LOGIC
LEVEL/ SYSTEM SETTING
SERIAL CLOCK SYSTEM SELECT
Ch 2 INPUT AMPLIFIER
GAIN ADJUST INTERNAL COMPARATOR THRESHOLD
Ch2 AMP IN (-)
-
Ch 2 BANDPASS FILTER
+ Ch 2 COMPARATOR
Ch2 AMP IN (+) Ch 2 AMP OUT
TONE FOLLOWER MODE
Fig.1 Functional Block Diagram
Brief Description
The FX641 is a low-power, system-selectable Dual Subscriber Private Metering (SPM) Detector -two detectors on a single chip- to indicate the presence, on a telephone line, of either 12kHz or 16kHz telephone call-charge frequencies. Under Processor control via a common serial interface, each channel of the FX641 will detect call-charge pulses from a telephone line and provide a digital output for recording, billing or security purposes. A common set of external components and a stable 3.579545MHz Xtal/clock input ensures that the FX641 adheres accurately to most national "Must and MustNot" decode band-edges and threshold levels. The digital output is pin-selectable to one of three modes: (1) Tone Follower mode -a logic level for the period of a correct decode. (2) Packet mode -respond/de-respond after a cumulative period of tone or notone in a preset period. (3) High-impedance output -for device multiplexing. For non-Processor systems a preset sensitivity/system input allows external channel level and system setting. This device, which is suitable for PBX and PABX line-card and remote telephone installations, is available in compact 24-pin plastic DIL and small outline (S.O.I.C.) packages. The FX641 requires approximately 4.5mA at 5-volts.
+
12kHz/16kHz SYSTEM
Ch 1 BANDPASS FILTER
-
+
+
-
PULSE GENERATOR AND DIVIDER
PULSE MEASUREMENT LOGIC
PULSE LENGTH LOGIC
PACKET MODE
OUTPUT SELECT CIRCUITS
CHANNEL 1
OUTPUT ENABLE
12kHz/16kHz SYSTEM
FX641
OUTPUT SELECT
CHANNEL 2
PULSE GENERATOR AND DIVIDER
PACKET MODE
PULSE MEASUREMENT LOGIC
PULSE LENGTH LOGIC
OUTPUT SELECT CIRCUITS
Ch 2 OUTPUT
Pin Number
FX641 D2/P4 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; circuit components are on-chip. When using a Xtal input, 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 (Xtal/Clock) pin must be connected directly to VDD (see Figure 2). See Figure 4 for details of clock frequency distribution.
2
Xtal: The output of the on-chip clock oscillator inverter.
3
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 Clock In pin. This output can support up to 3 additional FX641 microcircuits. See Figure 4 for details of clock frequency distribution.
4
Clock In: The 3.579545 clock pulse input to the internal clock dividers. If an externally generated clock pulse input is employed, the Xtal/Clock input pin should be connected to VDD.
5
Output Enable: For multi-chip output multiplexing; controls the state of both Ch1 and Ch2 outputs. When this input is placed high (logic '1') both outputs are set to a high impedance. When placed low (logic '0') both outputs are enabled.
6
Ch 2 Output: The digital output of the Channel 2 SPM detector when enabled. The format of the signal at this pin, in common with Ch 1, is selectable to either 'Tone Follower' or 'Packet' mode via the Output Select input.
7
Ch 1 Output: The digital output of the Channel 1 SPM detector when enabled. The format of the signal at this pin, in common with Ch 2, is selectable to either 'Tone Follower' or 'Packet' mode via the Output Select input.
8
VBIAS: The output of the on-chip analogue bias circuitry. Held internally at VDD/2, this pin should be decoupled to VSS (see Figure 2).
9
Ch 1 Amp Out: The output of the Channel 1 Input Amplifier. See Figures 2 and 3.
10
Ch 1 Amp In (-): The negative input to the Channel 1 Input Amplifier. See Figures 2 and 3.
11
Ch 1 Amp In (+): The positive input to the Channel 1 Input Amplifier. See Figures 2 and 3.
12
VSS: Negative supply rail (GND).
Pin Number
FX641 D2/P4 13 No internal connection; leave open circuit.
Function
14
Ch 2 Amp In (+): The positive input to the Channel 2 Input Amplifier. See Figures 2 and 3.
15
Ch 2 Amp In (-): The negative input to the Channel 2 Input Amplifier. See Figures 2 and 3.
16
Ch 2 Amp Out: The output of the Channel 2 Input Amplier. See Figures 2 and 3.
17
Output Select: A logic input to set the Channel 1 and Channel 2 output modes. When high (logic '1'), the outputs are in the Tone Follower mode; when low (logic '0'), the outputs are in the Packet mode.
18
Preset Level: A logic input to set the sensitivity mode of the FX641. When high (logic '1'), both channels are in the Fixed Sensitivity mode. The external components govern the input sensitivity; the System Select input selects 12kHz or 16kHz operation. When low (logic '0'), both channels are in the Controlled Sensitivity mode. Device sensitivities and system selection are via the Chip Select/Serial Data/Serial Clock inputs. This input has an internal pullup resistor on chip (Fixed Sensitivity Mode).
19
Chip Select: The Chip Select input for use in data loading when using the FX641 in the Controlled Sensitivity mode (see Figure 9). The device is selected when this input is set low (logic '0'). When the device is in the Fixed Sensitivity mode this input should be connected to either VSS or VDD.
20
Serial Clock: The Serial Clock input for use in data loading when using the FX641 in the Controlled Sensitivity mode (see Figure 9). Data is loaded to the FX641 on this clock's rising edge. When the device is in the Fixed Sensitivity mode this input should be connected to either VSS or VDD.
21
Serial Data: The Serial Data input for use in data loading when using the FX641 in the Controlled Sensitivity mode (see Figure 9 and Table 2). When the device is in the Fixed Sensitivity mode this input should be connected to either VSS or VDD.
22
System Select: In the Fixed Sensitivity mode this pin selects the system frequency. High (logic `1') = 12kHz; Low (logic `0') = 16kHz. In the Controlled Sensitivity mode this pin should be tied to Vdd or left unconnected. This pin has an internal pullup resistor on chip.
23
No internal connection; leave open circuit.
24
VDD: Positive supply rail; a single, stable power supply is required. Critical levels and voltages within the FX641 are dependant upon this supply. This pin should be decoupled to VSS by a capacitor mounted close to the pin.
Application Information
VDD
C1
XTAL/CLOCK
XTAL/CLOCK
For use with a Clock Pulse input X1 - Remove Xtal (X1) - Connect Pin 1 to VDD XTAL - Remove link (Pins 3/4) OUT - Input clock pulses to CLOCK IN CLOCK See Figure 4
1 2 3 4 5 6 7
24 23
VDD
SYSTEM SELECT
V SS
22
SERIAL DATA
IN CLOCK IN
OUTPUT ENABLE
21 20 19
SERIAL CLOCK
CHIP SELECT
Ch2 OUTPUT Ch1 OUTPUT VBIAS
Ch1 AMP OUT
FX641D2
PRESET LEVEL
18 17 16 15 14 13
R6
OUTPUT SELECT
8
R3
R7
Ch2 AMP OUT Ch2 AMP IN (-)
C3 C4
Ch1 AMP IN (-)
9 10
C5
R2
R1
R5 C6
Ch1 AMP IN (+)
R4 C2 R8
V SS
11 12
Ch2 AMP IN (+)
V SS
Component
R1 R2 R3 R4 R5 R6 R7 R8
Value
68k 68k 750k 750k 68k 68k 750k 750k
Tolerance
1% 1% 1% 1% 1% 1% 1% 1% C1 C2 C3 C4 C5 C6 X1 1.0F 1.0F 270pF 270pF 270pF 270pF 3.579545MHz 20% 20% 5% 5% 5% 5%
Fig.2 Recommended External Components
Fixed Sensitivity Setting Note that when calculating/selecting gain components, R3, R4, R7 and R8 should always be greater than or equal to 100k.
Differential Input
Common Mode Input
INPUT AMP
INPUT AMP
Ring (b)
FX641 (part) VBIAS
FX641 (part)
VBIAS
VSS
VSS
Fig.3 Example Input Configurations
+
-
+
-
Tip (a)
Application Information ......
CLOCK OUT
CLOCK IN
XTAL/CLOCK
CLOCK IN
CLOCK IN
CLOCK IN
X1 XTAL
XTAL/CLOCK
FX641
FX641
XTAL/CLOCK
Controller
XTAL/CLOCK
FX641 (used as Master Oscillator)
Ch 1 Ch 2
FX641
Ch 1
Ch 2
Ch 1
Ch 2
Ch 1 OUTPUT
Ch 2 OUTPUT
OUTPUT ENABLE
I/O Ports
Ch 2 Ch 1
3 to'N' LINE DECODER
"OUTPUT ENABLE" ADDRESSING
VDD
Maximum number of driven clocks (including Master) = 4 Maximum capacitive load on Clock Out output = 15.0pF
Fig.4 Examples of Xtal/Clock Distribution and Output Multiplexing
Xtal/Clock Distribution
The FX641 requires a 3.579545MHz Xtal or clock pulse input. With the exception of the Xtal, all oscillator components are incorporated on chip. If a Xtal input is employed the Clock Out pin should be directly linked to the Clock In pin. To reduce component and layout complexity, the clock requirements of up to 3 additional FX641 microcircuits may be supplied from a Xtal-driven FX641 acting as the system master clock. With reference to Figure 4, the clock should be distributed as illustrated and the Xtal/Clock pins of the driven microcircuits should be connected directly to VDD. Note that the maximum load on the master Clock Out pin should not be exceeded.
SIGNAL INPUT
TONE NOTONE
Channel Outputs
Channels 1 and 2 outputs operate together under the control of the Output Enable and Output Select inputs. Table 3 describes the operations. The Front Page description describes the output formats.
Ch1 and Ch 2 OUTPUTS
TONE FOLLOWER OUTPUT
PACKET MODE OUTPUT
RESPONSE DELAY
SIGNAL INPUT ......
TONE FOLLOWER OUTPUT ......
DERESPONSE DELAY
PACKET MODE OUTPUT ......
Fig.5 Tone Follower and Packet Mode Outputs
Application Information ......
Sensitivity Setting
To enable the FX641 to operate correctly to most national 12kHz and 16kHz SPM specifications, the input sensitivity can be accurately adjusted and set. There are two different pin-selectable modes of sensitivity setting available to the FX641: Controlled Sensitivity Mode and Fixed Sensitivity Mode The Controlled Sensitivity mode allows the sensitivity setting from a Controller via a 6-bit serial data input. This same serial input also sets operation (bit 0) to either 12kHz or 16kHz systems. Both channels are set identically. The Fixed Sensitivity mode allows the sensitivity of each channel to be set to a fixed "gain" by external components at the input amplifiers. Operation to either 12kHz or 16kHz is by the System Select input.
Controlled Sensitivity Setting
12kHz System Bit D0 = `1' Minimum Nominal Maximum Sensitivity Sensitivity Sensitivity dB(ref.) dB(ref.) dB(ref.) -16.2 -17.2 -18.2 -19.2 -20.2 -21.2 -22.2 -23.2 -24.2 -25.2 -26.2 -27.2 -28.2 -29.2 -30.2 -31.2 -32.2 -33.2 -34.2 -35.2 -36.2 -37.2 -38.2 -39.2 -40.2 -41.2 -42.2 -43.2 -17.5 -18.5 -19.5 -20.5 -21.5 -22.5 -23.5 -24.5 -25.5 -26.5 -27.5 -28.5 -29.5 -30.5 -31.5 -32.5 -33.5 -34.5 -35.5 -36.5 -37.5 -38.5 -39.5 -40.5 -41.5 -42.5 -43.5 -44.5 -18.8 -19.8 -20.8 -21.8 -22.8 -23.8 -24.8 -25.8 -26.8 -27.8 -28.8 -29.8 -30.8 -31.8 -32.8 -33.8 -34.8 -35.8 -36.8 -37.8 -38.8 -39.8 -40.8 -41.8 -42.8 -43.8 -44.8 -45.8 16kHz System Bit D0 = `0' Minimum Nominal Maximum Sensitivity Sensitivity Sensitivity dB(ref.) dB(ref.) dB(ref.) -16.9 -17.9 -18.9 -19.9 -20.9 -21.9 -22.9 -23.9 -24.9 -25.9 -26.9 -27.9 -28.9 -29.9 -30.9 -31.9 -32.9 -33.9 -34.9 -35.9 -36.9 -37.9 -38.9 -39.9 -40.9 -41.9 -42.9 -43.9 -18.2 -19.2 -20.2 -21.2 -22.2 -23.2 -24.2 -25.2 -26.2 -27.2 -28.2 -29.2 -30.2 -31.2 -32.2 -33.2 -34.2 -35.2 -36.2 -37.2 -38.2 -39.2 -40.2 -41.2 -42.2 -43.2 -44.2 -45.2 -19.5 -20.5 -21.5 -22.5 -23.5 -24.5 -25.5 -26.5 -27.5 -28.5 -29.5 -30.5 -31.5 -32.5 -33.5 -34.5 -35.5 -36.5 -37.5 -38.5 -39.5 -40.5 -41.5 -42.5 -43.5 -44.5 -45.5 -46.5
Serial Data Bits D5 - D1 00 00 00 00 00 00 00 00 01 01 01 01 01 01 01 01 10 10 10 10 10 10 10 10 11 11 11 11 11 11 11 11 000 001 010 011 100 101 110 111 000 001 010 011 100 101 110 111 000 001 010 011 100 101 110 111 000 001 010 011 100 101 110 111
Bandpass Filter Gain (dB) 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0
These states should never be used. If senstivities of this order are required (eg. the Swedish Rural SPM Specification), it is recommended that the Controlled Sensitivity setting is set to 20dB (1 0 1 0 0) and external components selected to set the Input Amp gain to a higher figure.
Table 2 Controlled Sensitivity Setting Information
The figures provided in Table 2 assume: 1. The recommended amplifier components (see Figure 2) are employed providing an amplifier gain at 16kHz of 19.8dB 0.3dB or at 12kHz of 19.1dB 0.3dB. 2. A comparator sensitivity of 1.6dB(ref.) 1dB (the variation being due to filter gain error, filter output offset, comparator input offset or a combination of all 3). 3. The applied VDD is 5.0 volts; 0dB (ref.) = 775mVrms.
Application Information ......
Controlled Sensitivity Setting ......
With the external gain (sensitivity) components employed as shown in Figure 2 the gain of the input stages is 19.8dB (12kHz) or 20.5dB (16kHz). For controlled sensitivity setting the gain of each bandpass filter, and hence the device sensitivity, is adjusted by the applied serial bits D1 to D5. In the Controlled Sensitivity mode the system frequency is selected by bit D0 (`1' = 12kHz; `0' = 16kHz). Data is loaded Bit 5 (D5) first. Table 2 details the serial data input to produce the required sensitivity. Minimum, Nominal and Maximum Sensitivity figures are provided to make complete allowance for internal circuit offsets and component tolerances. 0dB(ref.) = 775mVrms at V DD = 5.0 volts; varies directly with VDD. Examples are provided as a guide to meeting national specifications.
German FTZ Specification 16kHz This system has a Must Decode level of -21dB(ref.) and a Must-Not Decode level of -27dB(ref.). Reference to Table 2 shows that Bandpass Filter Gain settings of 5dB, 6dB or 7dB will enable an FX641 channel to meet this level specification. Figure 6 illustrates the range of these various settings. Hence to meet the German FTZ specification, the input data (D5 to D0 ) can be: 00101 0 5.0dB or 00110 0 6.0dB or 00111 0 7.0dB Selecting the middle setting would give the greatest noise immunity.
MUST DECODE
-21dB(ref.)
-21.9
WILL DECODE
-23.2 5.0dB
-22.9
-23.9
-24.2 6.0dB
-24.5
-25.5
WILL-NOT DECODE
-25.2 7.0dB
-26.5
MUST-NOT DECODE -27dB(ref.)
Fig.6 German Specification -Possible Settings
MUST DECODE
-17.36dB(ref.)
-18.2
WILL DECODE
-19.2
-19.5 2.0dB
-20.2
-20.8
-20.5 3.0dB -21.8
WILL-NOT DECODE
-21.5 4.0dB -22.8
MUST-NOT DECODE
-23.8dB(ref.)
French Specification 12kHz This system has a Must Decode level of -17.36dB(ref.) and a Must-Not Decode level of -23.8dB(ref.). Reference to Table 2 shows that Bandpass Filter Gain settings of 2dB, 3dB or 4dB will enable an FX641 channel to meet this level specification. Fig 7 illustrates the range of these various settings. Hence to meet the French SPM specification, the input data (D5 to D0 ) can be: 00010 1 2.0dB or 00011 1 3.0dB or 00100 1 4.0dB Selecting the middle setting would give the greatest noise immunity.
Fig.7 French Specification -Possible Settings
System Select X X 0 1 0 1 X
Preset Level 0 0 1 1 1 1 X
Output Select 0 1 0 0 1 1 X
Output Enable 0 0 0 0 0 0 1
Operating Mode Packet Mode Output; Serial Data Control Tone Follower Output; Serial Data Control Packet Mode Output; Preset Sensitivity 16kHz Packet Mode Output; Preset Sensitivity 12kHz Tone Follower Output; Preset Sensitivity 16kHz Tone Follower Output; Preset Sensitivity 12kHz Tristate Output High Z
Table 3 Operating Mode Configurations
X = don't care
Application Information ......
Application Information ......
-10
-15
SIGNAL LEVEL (dB): 0dB ref = 775mVrms
-20
MUST DECODE LEVEL
-25
MUST-NOT DECODE LEVEL
-30
-35
-40
-45
MINIMUM AMPLIFIER GAIN MAXIMUM AMPLIFIER GAIN
-50 -20 -15 -10 -5 0 5 10 15 20 25
AMPLIFIER GAIN (dB)
o VDD = 5.0 (+/- 0.1) VOLTS; TEMP = -40C to +85oC
Fig.8 Input Gain Calculation Graph for use in the Fixed Sensitivity Mode
Application Information ......
Fixed Sensitivity Setting
In this mode the sensitivity of each channel is set by the correct selection of the components around the Channel Input Amplifier. Note that the device sensitivity is directly proportional to the applied power supply (VDD). Input Gain Calculation The input amplifier, with its external circuitry, is available to set the sensitivity of the FX641 to conform to the user's national level specification with regard to `Must' and `Must-Not' decode signal levels. With reference to the graph in Figure 8, the following steps will assist in the determination of the required gain/attenuation. Step 1 Draw two horizontal lines from the Y-axis (Signal Level (dB)). The upper line will represent the required `Must' decode level. The lower line will represent the required `Must-Not' decode level. Step 2 Mark the intersection of the upper horizontal line and the upper sloping line; drop a vertical line from this point to the X-axis (Amplifier Gain (dB)). The point where the vertical line meets the X-axis will indicate the MINIMUM Input Amp gain required for reliable decoding of valid signals. Step 3 Mark the intersection of the lower horizontal line and the lower sloping line; drop a vertical line from this point to the X-axis. The point where the vertical line meets the X-axis will indicate the MAXIMUM allowable Input Amp gain. Input signals at or below the `Must-Not' decode level will not be detected as long as the amplifier gain is no higher than this level. Select the Input Gain Components as described. Microcircuit Protection Against High Voltages Telephone systems may have high d.c. and a.c. voltages present on the line. If the FX641 is part of a host equipment that has its own signal input protection circuitry, there will be no need for further protection as long as the voltage on any pin is limited to within VDD +0.3V and VSS -0.3V. If the host system does not have input protection, or there are signals present outside the device's specified limits, the FX641 will require protection diodes at its signal inputs (+ and -). The breakdown voltage of capacitors and the peak inverse voltage of the diodes must be sufficient to withstand the sum of the d.c. voltages plus all expected signal peaks.
Aliasing Due to the switched-capacitor filters employed in the FX641, care should be taken, with the chosen external components, to avoid the effects of alias distortion. Possible Alias Frequencies: 12kHz Mode = 52kHz 16kHz Mode = 69kHz If these alias frequencies are liable to cause problems and/or interference, it is recommended that anti-alias capacitors are employed across input resistors R3 and R4 or R7 and R8. Values of anti-alias capacitors should be chosen so as to provide a highpass cutoff frequency, in conjunction with R 3 (R4) (R7) (R8) of approximately 20kHz to 25kHz (12kHz system) or 25kHz to 30kHz (16kHz system). i.e. C = 2 1 x f0
x
x
R3
When anti-alias capacitors are used, allowance must be made for reduced gain at the SPM frequency (12kHz or 16kHz).
Input Gain Components With reference to the gain components shown in Figure 2. The user should calculate and select external components (R1/R3/C3, R2/R4/C4 and R5/R7/C5, R6/R8/C6) to provide amplifier gains within the limits obtained in Steps 2 and 3. Component tolerances should not move the gainfigure outside these limits. The graph in Figure 8 is for the calculation of input gain components for an FX641 using a VDD of 5.0 (0.1) volts. It is recommended that the designed gain is near the centre of the calculated range.
Specification
Absolute Maximum Ratings
Exceeding the maximum rating can result in device damage. Operation of the device outside the operating limits is not implied. Supply voltage -0.3 to 7.0V Input voltage at any pin (ref VSS = 0V) -0.3 to (VDD + 0.3V) Sink/source current (supply pins) +/- 30mA (other pins) +/- 20mA Total device dissipation @ TAMB 25C 800mW Max. Derating 10mW/C FX641D2/P4 -40C to +85C Operating Temperature (TOP): Storage Temperature range (TST): FX641D2/P4 -40C to +85C
Operating Limits
Correct operation of the device outside these limits is not implied.
Parameter
Supply Voltage (VDD) Operating Temperature (TOP) Xtal/Clock/Clock In Frequency
Min.
4.5 -40.0 3.558918
Max.
5.5 +85.0 3.589368
Unit
V C MHz
Operating Characteristics
All device characteristics are measured under the following conditions unless otherwise specified: VDD = 5.0V TAMB = -40C to +85C. Audio Level 0dB(ref.): = 775mVrms. Noise Bandwidth = 50kHz. Xtal/Clock or `Clock In' Frequency = 3.579545MHz. System Setting = 12kHz or 16kHz.
Characteristics
See Note
Min.
3.5 -5.0 -15.0 4.6 -5.0 60.0 1.0 11.82 12.48 15.76 16.64 2.6 -25.4 22.0 -36.0 -1.0
Typ.
2.0 100 -
Max.
5.0 15.0 1.5 5.0 0.4 5.0 12.18 11.52 16.24 15.36 0.6 -27.4 -27.0
Unit
mA pF V V A A V V A dB Hz M kHz kHz kHz kHz kHz kHz dB(ref.) dB(ref.) dB dB dB
Supply Current Input/Output Parameters Clock Out Load Logic Inputs Input Logic `1' (High) Input Logic `0' (Low) Input Leakage Current (VIN = 0 to VDD) 13 Input Current (VIN = 0) 14 Channel Outputs Output Logic `1' (IOH) = 120A) (Enabled) 1 Output Logic `0' (IOL) = 360A) (Enabled) 1 Output Leakage Current (High-Z Output) 2 Input Amplifier D. C. Gain Bandwidth (-3dB) Input Impedance Overall Performance 12kHz Detect Bandwidth 3 12kHz Not-Detect Frequencies (below 12kHz) 3 12kHz Not-Detect Frequencies (above 12kHz 3 16kHz Detect Bandwidth 3 16kHz Not-Detect Frequencies (below 16kHz) 3 16kHz Not-Detect Frequencies (above 16kHz) 3 Level Sensitivity Controlled Sensitivity Mode 3, 4, 12, 15 Preset Sensitivity Mode 3, 4, 5, 16 Signal Quality Requirements for Correct Operation Signal-to-Noise (Amp Input) 4, 8, 9, 10 Signal-to-Voice (Amp Input) 4, 8, 9, 11 Signal-to-Voice (Amp Output) 4, 8, 10, 11
1.6 -26.4 20.0 -40.0 -
Continued on next page ......
Specification ......
Characteristics See Note Min. Typ. Max. Unit
Channel Outputs (Ch1 and Ch2) Figure 5 Mode Change Time 6 500 ns Tone Follower Mode (Table 3) Response and De-Response Time 3, 4, 7 10.0 ms Packet Mode (Table 3) Response and De-Response Time 3, 4, 7 40.0 48.0 ms Notes 1. Tone Follower or Packet mode enabled; see Table 3. 2. Tristate selected; see Table 3. 3. With adherence to Signal-to-Voice and Signal-to Noise specifications. 4. 12kHz and/or 16kHz system. 5. With Input Amp gain setting = 0dB. 6. Time taken to change between any two of the operational modes: Tone Follower, Packet or Tristate, and with a maximum capacitive load of 30pF on an output. 7. The time delay, after a valid serial data load (or after device powerup), before the condition of the outputs can be guaranteed correct. 8. Immunity to false responses and/or de-responses. 9. Common Mode SPM and balanced voice input signal. 10. With SPM and voice signal amplitudes balanced; to avoid false de-responses due to saturation, the peak-topeak voice + noise level at the output of the Input Amp should be no greater than the dynamic range of the device. For this reason, the signal-to-voice figure at the Am[ Output will vary with the sensitivity setting. The lowest signal-to-voice figure occurs at the highest sensitivity setting (Table 2, 27dB). 11. Maximum voice frequencies = 3.4kHz. 12. With the Input Amplifier gain at 0dB and the Bandpass Filter gain set at 0dB (Table 2); subtract 1.0dB from this specification for each extra single dB of Bandpass Filter gain programmed. Alternatively, with the input components as recommended in Figure 2, the sensitivity is as defined in Table 2. 13. Logic inputs with no internal pullup; Chip Select, Serial Data, Serial Clock, Output Enable, Output Select and Clock In pins. 14. Logic inputs with an internal pullup; Preset Level and System Select pins. 15. Preset Level= `0', System Select = don't care; Chip Select, Serial Clock and Serial Data inputs active; see Table 3. 16. Preset Level = `1', System Select = input active; Chip Select, Serial Clock and Serial Data inputs inactive; see Table 3.
CHIP SELECT
t CSE t CYC t CSH
SERIAL CLOCK
tDS
SERIAL DATA
tDH
Don't Care Data
tPWL
tPWH BIT D4 D3 BIT D0
BIT D5
Fig.9 Data Load Timing for the Controlled Sensitivity Mode
Parameter
tPWH tPWL tCYC tCSE tDH tDS tCSH Serial Clock `High' Pulse Width Serial Clock `Low' Pulse Width Serial Clock Period Chip Select `Low' to Clock `High' Edge Data Hold Time Data Setup Time Chip Select `High' from: Clock `High' Edge Clock `High' Edge
Min.
250 250 600 450 50.0 250 50.0 -
Typ.
-
Max.
1
Unit
ns ns ns ns ns ns ns serial clock period
Package Outlines
The FX641 is available in the package styles outlined below. Mechanical package diagrams and specifications are detailed in Section 10 of this document. Pin 1 identification marking is shown on the relevant diagram and pins on all package styles number anti-clockwise when viewed from the top.
Handling Precautions
The FX641 is a CMOS LSI circuit which includes input protection. However precautions should be taken to prevent static discharges which may cause damage.
FX641D2 24-pin plastic S.O.I.C.
FX641P4 24-pin plastic DIL
NOT TO SCALE
NOT TO SCALE
Max. Body Length Max. Body Width
15.70mm 7.65mm
Max. Body Length Max. Body Width
31.85mm 13.82mm
Ordering Information
FX641D2 FX641P4 24-pin plastic S.O.I.C. 24-pin plastic DIL
CML does not assume any responsibility for the use of any circuitry described. No circuit patent licences are implied and CML reserves the right at any time without notice to change the said circuitry.
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COMMUNICATION SEMICONDUCTORS
CML Product Data
In the process of creating a more global image, the three standard product semiconductor companies of CML Microsystems Plc (Consumer Microcircuits Limited (UK), MX-COM, Inc (USA) and CML Microcircuits (Singapore) Pte Ltd) have undergone name changes and, whilst maintaining their separate new names (CML Microcircuits (UK) Ltd, CML Microcircuits (USA) Inc and CML Microcircuits (Singapore) Pte Ltd), now operate under the single title CML Microcircuits. These companies are all 100% owned operating companies of the CML Microsystems Plc Group and these changes are purely changes of name and do not change any underlying legal entities and hence will have no effect on any agreements or contacts currently in force. CML Microcircuits Product Prefix Codes Until the latter part of 1996, the differentiator between products manufactured and sold from MXCOM, Inc. and Consumer Microcircuits Limited were denoted by the prefixes MX and FX respectively. These products use the same silicon etc. and today still carry the same prefixes. In the latter part of 1996, both companies adopted the common prefix: CMX. This notification is relevant product information to which it is attached.
Company contact information is as below:
CML Microcircuits (UK)Ltd
COMMUNICATION SEMICONDUCTORS
CML Microcircuits (USA) Inc.
COMMUNICATION SEMICONDUCTORS
CML Microcircuits (Singapore)PteLtd
COMMUNICATION SEMICONDUCTORS
Oval Park, Langford, Maldon, Essex, CM9 6WG, England Tel: +44 (0)1621 875500 Fax: +44 (0)1621 875600 uk.sales@cmlmicro.com www.cmlmicro.com
4800 Bethania Station Road, Winston-Salem, NC 27105, USA Tel: +1 336 744 5050, 0800 638 5577 Fax: +1 336 744 5054 us.sales@cmlmicro.com www.cmlmicro.com
No 2 Kallang Pudding Road, 09-05/ 06 Mactech Industrial Building, Singapore 349307 Tel: +65 7450426 Fax: +65 7452917 sg.sales@cmlmicro.com www.cmlmicro.com
D/CML (D)/1 February 2002

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