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参数资料
| 型号： | 12197-507-XTD |
| 元件分类： | 调制器/解调器 |
| 英文描述： | 1.2 kbps DATA, MODEM, PQFP32 |
| 封装： | LEAD FREE, LQFP-32 |
| 文件页数： | 5/11页 |
| 文件大小： | 580K |
| 代理商： | 12197-507-XTD |
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Data Sheet
3.0 Pin Descriptions
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IAREF
Analog Reference Voltage
Analog input sets the dc operating point of the operational amplifiers and comparators and is usually selected to split the
dc potential between VDD and VSS. See IAREF in DC Characteristics, Table 6
ICDREF
Carrier Detect Reference Voltage
Analog input controls at which level the carrier detect (OCD) becomes active. This is determined by the dc voltage
difference between ICDREF and IAREF. Selecting ICDREF - IAREF equal to 0.08 VDC will set the carrier detect to a nominal
100 mVp-p
INRESET
Reset Digital Logic
When at logic low (VSS) this input holds all the digital logic in reset. During normal operation INRESET should be at VDD.
INRESET should be held low for a minimum of 10nS after VDD = 2.5V as shown in Figure 3
INRTS
Request to Send
Active-low input selects the operation of the modulator. OTXA is enabled when this signal is low. This signal must be
held high during power-up
IRXA
Analog Receive Input
Input accepts the 1200/2200Hz signals from the external filter
IRXAC
Analog Receive Comparator Input
Positive input of the carrier detect comparator and the receiver filter comparator
ITXD
Digital Transmit Input (CMOS)
Input to the modulator accepts digital data in NRZ form. When ITXD is low, the modulator output frequency is 2200Hz.
When ITXD is high, the modulator output frequency is 1200Hz.
IXTL
Oscillator Input
Input to the internal oscillator must be connected to a parallel mode 460.8kHz ceramic resonator when using the internal
oscillator or grounded when using an external 460.8kHz clock signal
OCBIAS
Comparator Bias Current
The current through this output controls the operating parameters of the internal operational amplifiers and
comparators. For normal operation, OCBIAS current is set to 2.54A.
OCD
Carrier Detect Output
Output goes high when a valid input is recognized on IRXA. If the received signal is greater than the threshold specified
on ICDREF for four cycles of the IRXA signal, the valid input is recognized.
ORXAF
Analog Receive Filter Output
Signal is the square wave output of the receiver high-pass filter
ORXD
Digital Receive Output (CMOS)
Signal outputs the digital receive data. When the received signal (IRXA) is 1200Hz, ORXD outputs logic high. When the
received signal (IRXA) is 2200Hz, ORXD outputs logic low. ORXD is qualified internally with OCD.
OTXA
Analog Transmit Output
Output provides the trapezoidal signal controlled by ITXD. When ITXD is low, the output frequency is 2200Hz. When
ITXD is high, the output frequency is 1200Hz. This output is active when INRTS is low and 0.5 VDC when INRTS is high.
OXTL
Oscillator Output
Output from the internal oscillator must be connected to an external 460.8kHz clock signal or to a parallel mode
460.8kHz ceramic resonator when using the internal oscillator
TEST(12:1) Factory Test
Factory test pins; for normal operation, tie these signals as per Table 1 and Table 2
VDD
Digital Power
Power for the digital modem circuitry
VDDA
Analog Supply Voltage
Power for the analog modem circuitry
VSS
Ground
Analog and digital ground
VSSA
Analog Ground
Table 3: Pin Descriptions
Figure 3: Reset Timing
Note:
This signal is also present on the LSI 20C15. It is labeled as Test6. The 20C15 data sheet mentions the reset function of this pin but does not emphasize its use to reset the chip. Reliable operation
of the modem requires a hardware reset as shown in Figure 3. This is true for the AMIS 12197-503 and 12197-504 as well as the LSI 20C15.
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