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ML145443 Arkusz danych(PDF) 4 Page - LANSDALE Semiconductor Inc.

Numer części ML145443
Szczegółowy opis  Single-Chip 300-Baud Modem
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Producent  LANSDALE [LANSDALE Semiconductor Inc.]
Strona internetowa  http://www.lansdale.com
Logo LANSDALE - LANSDALE Semiconductor Inc.

ML145443 Arkusz danych(HTML) 4 Page - LANSDALE Semiconductor Inc.

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LANSDALE Semiconductor, Inc.
ML145442, ML145443
PIN DESCRIPTIONS
VDD
Positive Power Supply (Pin 6)
This pin is normally tied to 5.0 V.
VSS
Negative Power Supply (Pin 12)
This pin is normally tied to 0 V.
VAG
Analog Ground (Pin 19)
Analog ground is internally biased to (VDD – VSS)/2. This
pin must be decoupled by a capacitor from VAG to VSS and a
capacitor from VAG to VDD. Analog ground is the common bias
line used in the switched capacitor filters, limiter, and slicer in
the demodulation circuitry.
TLA
Transmit Level Adjust (Pin 20)
This pin is used to adjust the transmit level. Transmit level
adjustment range is typically from –12 dBm to –9 dBm. (See
Legacy Applications Information.)
TxD
Transmit Data (Pin 11)
Binary information is input to the transmit data pin. Data
entered for transmission is modulated using FSK techniques. A
logic high input level represents a mark and a logic low repre-
sents a space (see Table 1).
TxA
Transmit Carrier (Pin 17)
This is the output of the line driver amplifier. The transmit
carrier is the digitally synthesized sine wave output of the modu-
lator derived from a crystal oscillator reference. When a 3.579
MHz crystal is used the frequency outputs shown in Table 1
apply. (See Legacy Applications Information.)
ExI
External Input (Pin 18)
The external input is the non–inverting input to the line driver.
It is provided to combine an auxiliary audio signal or speech
signal to the phone line using the line driver. This pin should be
connected to VAG if not used. The average level must be the
same as VAG to maintain proper operation. (See Legacy
Applications Information.)
DSI
Driver Summing Input (Pin 1)
The driver summing input may be used to connect an external
signal, such as a DTMF dialer, to the phone line. A series resis-
tor, RDSI, is needed to define the voltage gain AV (see Legacy
Applications Information and Figure 6). When applying a signal
to the DSI pin, the modulator should be squelched by bringing
SQT (pin 14) to a logic high level. The voltage gain, AV, is cal-
culated by the formula AV = –Rf/RDSI (where Rf≈ 20 kΩ). For
example, a 20 k
Ω resistor for RDSI will provide unity gain (AV
= –20 k
Ω/20 kΩ = –1). This pin must be left open if not used.
RxD
Receive Data (Pin 6)
The receive data output pin presents the digital binary data
resulting from the demodulation of the receive carrier. If no car-
rier is present, CD high, the receive data output (RxD) is
clamped high.
Table 1. Bell 103 and CCITT V.21
Frequency Characteristics
Originate Mode
Answer Mode
Data
Transmit
Receive
Transmit
Receive
Bell 103 (ML145443)
Space
1070 Hz
2025 Hz
2025 Hz
1070 Hz
Mark
1270 Hz
2225 Hz
2225 Hz
1270 Hz
CCITT V.21 (ML145442)
Space
1180 Hz
1850 Hz
1850 Hz
1180 Hz
Mark
980 Hz
1650 Hz
1650 Hz
980 Hz
NOTE: Actual frequencies may be
±5 Hz assuming 3.579545 MHz
crystal is used.
15 dB/OCTAVE
256
64
16
3.4 4
2
0
0
–20
–25
–55
–60
MAXIMUM LEVEL OF OUT–OF–BAND ENERGY
RELATIVE TO THE TRANSMIT CARRIER LEVEL INTO 600Ω (kHz)
Figure 2. Out–of–Band Energy
TEST
INPUT
600 Ω
600 Ω
VDD
RTLA
20
17
15
16
TEST
OUTPUT
4
CDT
RxA1
CCDT
CFB
0.1 µF
10
FB
RxD
5
11
Dout
Din
TxD
Xin
9
8
Xout
TLA
TxA
RxA2
ML145442
ML145443
0.1 µF
3.579 MHz ± 0.1%
Figure 1. AC Characteristics Evaluation Circuit
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