Texas Instruments TCM4300 Scen, Sint, Synclk, Syndta, SYNLE0, SYNLE1 SYNLE2 Synol, Txen, Txin

1.4Terminal Functions (Continued)

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

1±7