FX614 Consumer Microcircuits Limited, FX614 Datasheet
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FX614
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FX614 Summary of contents
Page 1
... C when operating at 1200bits/sec. An optional line equaliser is incorporated into the receive path, this is controlled by an external logic level. The FX614 may be used in a wide range of telephone telemetry systems. With a low operating voltage of 3.0V, a very low current 'sleep' mode (1 A) and an operating current of 1mA the device is ideal for portable, terminal and line powered applications ...
Page 2
... Mode Control Logic ....................................................................6 1.5.3 Rx Input Amplifier .......................................................................6 1.5.4 Receive Filter and Equaliser.......................................................6 1.5.5 Energy Detector ..........................................................................7 1.5.6 FSK Demodulator........................................................................7 1.5.7 FSK Modulator and Transmit Filter............................................7 1.5.8 Rx Data Retiming ........................................................................9 1.5.9 Tx Data Retiming.......................................................................10 1.6 Application Notes .....................................................................................12 1.6.1 Line Interface.............................................................................12 1.7 Performance Specification.......................................................................13 1.7.1 Electrical Performance..............................................................13 1.7.2 Packaging..................................................................................16 1997 Consumer Microcircuits Limited CONTENTS 2 FX614 Page D/614/4 ...
Page 3
... A logic level input for setting the mode of the device. See section 1.5.2. I/P A logic level input for setting the mode of the device. See section 1.5.2. I/P Input to the Rx input amplifier. O/P Output of the Rx input amplifier, and the input to the Rx filter. O/P The output of the FSK generator. Power The negative supply rail (ground). 3 FX614 D/614/4 ...
Page 4
... An external pull-up resistor should be connected between this output and Power The positive supply rail. Levels and thresholds within the device are proportional to this voltage. Should be decoupled capacitor mounted close to the device pins. 4 used as an Interrupt C. FX614 and V DD BIAS It is D/614/4 ...
Page 5
... If the clock is provided by an external source which is not always running, then the 'Zero-Power' mode must be set when the clock is not available. Failure to observe this rule may cause a significant rise in the supply current drawn by FX614 as well as generating undefined states of the RXD, DET and RDYN outputs. 1997 Consumer Microcircuits Limited 100k 3 ...
Page 6
... Bell 202 Compatible Modem 1.5.2 Mode Control Logic The FX614's operating mode is determined by the logic levels applied to the M0 and M1 input pins 1200bits/sec 1200bits/sec 1 1 [1] If enabled. In the 'Zero-Power' (ZP) mode, power is removed from all internal circuitry. When leaving the 'ZP' mode there must be a delay of 20ms before any Tx data is passed to data read from, the device to allow the bias level, filters and oscillator to stabilise ...
Page 7
... FSK out of band energy sent to the line in accordance with Figures 5a and 5b, assuming that the signal on the line is at -6dBm or less. 1997 Consumer Microcircuits Limited See section 1.7.1 for definitions of Teon and Teoff Figure 4 FSK Level Detector Operation M0 TXD = ' [1] 0 0Hz 0 487Hz 1 2200Hz / TXD = '1' - 387Hz 387Hz 1200Hz FX614 D/614/4 ...
Page 8
... Figure 5b Tx limits at 1200bits/sec rate Frequency / Frequency / Hz FX614 D/614/4 ...
Page 9
... The only restrictions on the timing of the CLK waveform are those shown in Figure 6a and the need to complete the transfer of all nine bits into the C within the time of a complete character at 1200bits/sec. 1997 Consumer Microcircuits Limited Parity bits Stop bits 0 >=2 1 >=1 0 >=1 1 >=1 0 >=1 9 FX614 D/614/4 ...
Page 10
... Note that, if enabled, the Data Retiming block may interpret speech or other signals as random characters. If the Data Retiming facility is not required, the CLK input to the FX614 should be kept high at all times. The asynchronous data from the FSK Demodulator will then be connected directly to the RXD output pin, and the RDYN output will not be activated by the FSK signal ...
Page 11
... CLK line is pulled high. If the data retiming facility is not required, the CLK input to the FX614 should be kept high at all times. The asynchronous data to the FSK modulator will then be connected directly to the TXD input pin. This is illustrated in Figure 6d and will also be the case when transmitting 5bits/sec or 150bits/sec data which have no retime option ...
Page 12
... Application Notes 1.6.1 Line Interface The signals on the telephone line are not suitable for direct connection to the FX614. A Line Interface circuit is necessary to: Provide high voltage and dc isolation Attenuate the Tx signal present at the Rx input Provide the low impedance drive necessary for the line ...
Page 13
... SS Notes 1 13 Min. Max. Units -0.3 7 -30 +30 mA -20 +20 mA Min. Max. Units 800 mW 13 mW/°C -55 +125 °C -40 +85 °C Min. Max. Units 800 mW 13 mW/°C -55 +125 °C -40 +85 °C Min. Max. Units 3.0 5.5 V -40 +85 °C 3.575965 3.583125 MHz FX614 D/614/4 ...
Page 14
... FX614 Units Baud Hz Hz dBV dB dB dBV ms ms Baud Baud dB dB Baud Hz Hz Baud Hz Hz D/614/4 ...
Page 15
... Pulse Width 'Low' Pulse Width Notes not including any current drawn from the FX614 pins by external circuitry other than X1, C1 and C2. 2. TXD, RXEQ and CLK inputs Measured at the Rx Input Amplifier output (pin RXFB) for 1200Hz and V ...
Page 16
... Bell 202 Compatible Modem 1.7.2 Packaging Figure 8 16-pin SOIC (D4) Mechanical Outline: Order as part no. FX614D4 Figure 9 16-pin DIL (P3) Mechanical Outline: Order as part no. FX614P3 Handling precautions: This product includes input protection, however, precautions should be taken to prevent device damage from electro-static discharge. CML does not assume any responsibility for the use of any circuitry described ...
Page 17
... 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. ...