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The Z02922 TransProTM is a synchronous single -chip modem solution that e nables cons truction o f either a
V.22bis modem capable o f 2400 bps fu ll-d uplex, or a 9 600 bps half - duplex ov er dial- up lines. Th e Z02922
is specifically designed for use in embedded modem applications where space, performance, and low
power consumption are key require me nts .
The Z02922 T rans Pro incl udes a Qui ck Connect handshake option t hat all ows the u ser to make hand shakes
in 50 milliseconds or less. This feature is especially useful in transaction processing applications such as
credit card terminals and network access controllers, where a small amount of data is transmitted.
Operating over the Public Switched Telephone Network (PSTN), the Z02922 TransProTM meets the
modem standards for V.29, V.22bis, V.22, V.23, V.21, Bell 212A, and Bell 103.
The Z02922 includes automatic handshakes, and also includes manual control over handshake timings.
Manual handshake control allows the user to develop handshakes for specific requirements, such as for
some point of sale equipment that includes custom handshakes.
A typical modem ap pli cation can be cre ated by simply addin g a co ntrol micropr oce sso r ( H ost ), p hone li ne
interface, and DTE interface (see Figure 1).
The Z02922 TransPro performs HDLC framing at all speeds. This capability eliminates the requirement
for an external Serial Input/Output (SIO) device for Data Te rminal Equipment (DTE) in products
incorporating error control.
All modulation, demodulation, filtering, A/D and D/A conversion functions for transmit and receive are
provided on-chip. Automatic and selectable compromise equalizers are included to optimize performance
over a wide range of line types.
The Z02922 device compensates for a wide variety of adverse line conditions by using a combination of
fixed link, fixed cable, and adaptive equalizers.
The Z02922 provides comprehensive selectable and programmable tone generation and detection.
All digital I/O signals are TTL compatible. The parallel interface is compatible with standard 8-bit
microprocessors, allowing direct access to eight I/O registers and indirect access to the modem RAM.
The RAM acces s capabil ity al lows the Ho st to re trieve diagnosti c data, mod em/line s tatus an d control da ta,
and set programmable coefficients. The serial interface is used for data transfer. All control and status
information is transferred by means of the parallel interface.
The Z02922 transmit drivers and receive amplifiers can be connected directly to a Data Access
Arrangement (DAA) by means of a transformer. Completing this connection reduces the external circuits
to a minimum.
In addition, the Z02922 offers further system level savings by providing built-in filters for both the
Transmitter Analog Output and the Receiver Analog Input, thus eliminating the requirement for external
filtering components.
The Z02922 device operates on a single +5 VDC power supply. During periods of no traffic, the Host can
place the modem into 5.''2 mode, reducing power consumption to less than 1 percent of full load power.