fx604 Consumer Microcircuits Limited, fx604 Datasheet
fx604
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fx604 Summary of contents
Page 1
... An optional line equaliser is incorporated into the receive path, this is controlled by an external logic level. The FX604 may be used in a wide range of telephone telemetry systems. With a low voltage requirement of 3. suitable for both portable terminal and line powered applications. A very low current 'sleep' mode (1 A typ ...
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... 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 1996 Consumer Microcircuits Limited CONTENTS 2 FX604 Page D/604/3 ...
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 FX604 D/604/3 ...
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. FX604 and V DD BIAS It is D/604/3 ...
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 FX604 as well as generating undefined states of the RXD, DET and RDYN outputs. 1996 Consumer Microcircuits Limited 100k 3 ...
Page 6
... V.23 Compatible Modem 1.5.2 Mode Control Logic The FX604's operating mode is determined by the logic levels applied to the M0 and M1 input pins [1] If enabled. In the 'Zero-Power' mode, power is removed from all internal circuitry. When leaving 'Zero-Power' 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. 1996 Consumer Microcircuits Limited See section 1.7.1 for definitions of Teon and Teoff Figure 4 FSK Level Detector Operation M0 TXD = ' 0Hz 0 450Hz 1 2100Hz / TXD = '1' [1] 390Hz 1300Hz FX604 D/604/3 ...
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... V.23 Compatible Modem 1996 Consumer Microcircuits Limited Figure 5a Tx limits at 75bits/sec rate Figure 5b Tx limits at 1200bits/sec rate 8 FX604 D/604/3 ...
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. 1996 Consumer Microcircuits Limited Parity bits Stop bits 0 >=2 1 >=1 0 >=1 1 >=1 0 >=1 9 FX604 D/604/3 ...
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 FX604 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 FX604 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 75bits/sec data which has 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 FX604. 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 ...
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... 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 FX604 D/604/3 ...
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... Consumer Microcircuits Limited = 3.3V to 5.5V at Tamb = -40 to +85°C, DD 0.1% Notes Min 1280 2068 3 -40.0 -7 8.0 1188 1194 5 -1.0 -2.0 0 1297 2097 0 388 448 14 FX604 Typ. Max. Units 1.0 1.25 mA 1 1.0 A 1200 1212 Baud 1300 1320 Hz 2100 2132 Hz - -8.0 dBV - +7.0 dB ...
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... Pulse Width 'Low' Pulse Width Notes not including any current drawn from the FX604 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 1300Hz and V ...
Page 16
... V.23 Compatible Modem 1.7.2 Packaging Figure 8 16-pin SOIC (D4) Mechanical Outline: Order as part no. FX604D4 Figure 9 16-pin DIL (P3) Mechanical Outline: Order as part no. FX604P3 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 ...
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... 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. ...