TCM4300 Datasheet, PDF (13/69 Pages) Texas Instruments – Advanced RF Cellular Telephone Interface Circuit (ARCTIC )

1.4 Terminal Functions (Continued)
TERMINAL
NAME
NO.
SCEN
94
SINT
79
SYNCLK
32
SYNDTA
31
SYNLE0
28
SYNLE1
29
SYNLE2
30
SYNOL
27
TXEN
23
TXIN
18
TXIP
17
TXONIND
24
TXQN
21
TXQP
20
VCM
15
VHR
14
VSS
XTAL
13, 97
66
I/O
DESCRIPTION
O Speech CODEC enable. A high out from SCEN can enable the speech CODEC.
O Sample interrupt. SINT is active low. In the analog mode, SINT occurs at 40 kHz; in the
digital mode, SINT occurs at 48.6 kHz.
O Synthesizer clock. SYNCLK clocks the serial data stream.
O Synthesizer serial-data. SYNDTA provides the serial bit stream output.
O Synthesizer 0, 1, and 2 latch enables. An active high on SYNLE0, SYNLE1, and
O ^{SYNLE2 indicates that the latch is enabled.}
O
I Synthesizer out-of-lock. An active high at SYNOL indicates a synthesizer is not locked.
O Transmit power enable. An active high output from TXEN can be used to enable various
system transmitter-circuit devices.
O In-phase differential negative baseband transmit. The negative component of the
differential baseband transmit signal is output from TXIN.
O In-phase differential positive baseband transmit. The positive component of the
differential baseband transmit signal is output from TXIP.
I Transmit on indicator. A signal is applied to TXONIND to indicate that power is applied
to the power amplifier.
O Quadrature differential negative baseband transmit. The negative component of the
quadrature differential transmit signal is output from TXQN.
O Quadrature differential positive baseband transmit. The positive component of the
quadrature differential transmit signal is output from TXQP.
I Voltage common mode. VCM establishes the dc operating point for transmit outputs and
can be tied to VHR.
O Voltage half-rail. The voltage level at VHR is approximately 0.5 × AVDD. VHR
establishes the dc operating point for receive inputs.
— Substrate ground
I Crystal input. A crystal connected between XTAL and MCLIN forms an oscillator circuit.
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