FX604D4 Consumer Microcircuits Limited, FX604D4 Datasheet
FX604D4
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FX604D4 Summary of contents
Page 1
... A typ.) and operating current of 1mA typ. mean the device is ideal for line powered applications. A 3.58MHz standard Xtal/Clock rate is required and the device operates from a 3.0 to 5.5V supply. Both SOIC (D4) and Plastic DIL (P3) 16-pin package types are available. 1996 Consumer Microcircuits Limited FX604 Optional Line Equalisation -40° ...
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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 ...
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... RXIN 6 RXFB 7 TXOP 1996 Consumer Microcircuits Limited Figure 1 Block Diagram Description Type O/P The output of the on-chip Xtal oscillator inverter. I/P The input to the on-chip Xtal oscillator inverter. I/P 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 ...
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... A ground plane protecting the receive path will help attenuate interfering signals. 1996 Consumer Microcircuits Limited Description Type O/P Internally generated bias voltage, held when the device is not in 'Zero-Power' mode ...
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 3.579545MHz ...
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... This block also includes a switchable equaliser section. When the RXEQ pin is low the overall group delay of the receive filter is flat over the 1200bits/sec frequency range. If the RXEQ pin is high the receive filter's typical overall group delay will be as shown in Figure 3. Figure 3 Rx Equaliser Group Delay (RXEQ = '1') with respect to 1700Hz 1996 Consumer Microcircuits Limited Rx Mode Tx Mode 1200bits/sec ...
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... When modulated at the appropriate baud rates, the Transmit Filter and associated external components (see section 1.6.1) limit the 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 ...
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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 ...
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... Data Retiming function is not required the CLK input should be kept high at all times. 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 > ...
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... A low to high change on the CLK input pin will latch the data from the TXD input pin into the first register ready for transfer to the second register when the internal 1200Hz signal next occurs. 1996 Consumer Microcircuits Limited Tchi = CLK high time; min 1 s ...
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... 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. Figure 6d FSK Operation without Tx Data Retiming (CLK always high) 1996 Consumer Microcircuits Limited Ts = data set up time; min data hold time; min 1 s ...
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... R2: For optimum results R2 should be set so that the gain is V 5.0V, rising to 150k R3: The levels in dB (relative to a 775mV rms signal) at 'A', 'B' and 'C' in the line interface circuit are 3.3V -3.6dB 5.0V 1996 Consumer Microcircuits Limited Figure 7 Line Interface Circuit 3.3V. DD 'A' = 20Log(V ...
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... Operating Temperature Operating Limits Correct operation of the device outside these limits is not implied. Supply ( Operating Temperature Xtal Frequency Notes Xtal frequency of 3.579545MHz ±0.1% is required for correct FSK operation. 1996 Consumer Microcircuits Limited pins SS Notes 1 13 Min. Max. Units -0.3 7 ...
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... Tx Data Rate FSK Modulator TXOP Level Twist (Mark Level WRT Space Level) Tx 1200bits/sec (M1='0', M0='1'). Bit Rate Mark (Logical 1) Frequency Space (Logical 0) Frequency Tx 75bits/sec (M1='0', M0='0'). Bit Rate Mark (Logical 1) Frequency Space (Logical 0) Frequency 1996 Consumer Microcircuits Limited = 3.3V to 5.5V at Tamb = -40 to +85°C, DD 0.1% Notes Min ...
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... Flat noise in 300-3400Hz band. 5. Relative to 775mVrms Open loop, small signal low frequency measurements. 7. Timing for an external input to the XTAL/CLOCK pin. 8. Assuming data retiming is not enabled. 9. Delay from mode change to reliable data at TXOP or RXD pins. 1996 Consumer Microcircuits Limited Notes Min ...
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... 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. ...