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1–7
1.4
Terminal Functions (Continued)
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
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 i di
t
th t th l t h i
bl d
SYNLE1
29
O
y
g
SYNLE2 indicates that the latch is enabled.
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
—
Substrate ground
XTAL
66
I
Crystal input. A crystal connected between XTAL and MCLIN forms an oscillator circuit.
Summary of Contents for TCM4300
Page 1: ...Data Manual 1996 Mixed Signal Products...
Page 2: ...Printed in U S A 10 96 SLWS010F...
Page 23: ...2 8...
Page 35: ...3 12...
Page 67: ...4 32...