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M5913 Datasheet(PDF) 5 Page - STMicroelectronics

Part No. M5913
Description  COMBINED SINGLE CHIP PCM CODEC AND FILTER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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the
signaling
function.
TSX is a timeslot
strobe/buffer enable output which gates the PCM
word onto the PCM highway when an external
buffer is used to drive the line.
Data is transmitted on the highway at DX on the
first eight positive transitions of CLKX following
the rising edge of FSX. Similarly, on the receive
side, data is received on the first eight falling
edges of CLKR. The frequency of CLKX and CLKR
is selected by the CLKSEL pin to be either 1.536,
1.544 or 2.048MHz. No other frequency of opera-
tion is allowed in the fixed data rate mode.
Variable Data Rate Mode
Variable data rate timing is selected by connect-
ing DCLKR to the bit clock for the receive PCM
highway rather than to VBB. It employes master
clocks CLKX and CLKR, bit clocks DCLKR and
DCLKX and frame synchronization clocks FSR
and FSX.
Variable data rate timing allows for a flexible data
frequency. It provides the ability to vary the fre-
quency of the bit clocks, from 64kHz to 4096MHz.
Master clocks inputs are still restricted to 1.536,
1.544, or 2.048MHz.
In this mode, DCLKR and DCLKX become the
data clocks for the receive and transmit PCM
highways. While FSX is high, PCM data from DX
is transmitted onto the highway on the next eight
consecutive positive transitions of DCLKX. Simi-
larly, while FSR is high, each PCM bit from the
highway is received by DR on the next eight con-
secutive negative transitions of DCLKR.
On the transmit side, the PCM word will be re-
peated in all remaining timeslots in the 125
µs
frame as long as DCLKX is pulsed and FSX is
held high. This feature allows the PCM word to be
transmitted to the PCM highway more than once
per frame, if desired, and is only available in the
variable data rate mode. Conversely, signaling is
only allowed in the fixed data rate mode since the
variable mode provides no means with which to
specify a signaling frame.
Precision Voltage References
No external components are required with the
combochip to provide the voltage reference func-
tion. Voltage references are generated on-chip
and are calibrated during the manufacturing proc-
ess. The technique use the bandgap principle to
derive a temperature and bias stable reference
voltage. These references determine the gain and
dynamic range characteristics of the device.
Separate references are supplied to the transmit
and receive sections. Transmit and receive sec-
tion are trimmed independently in the filter stages
to a final precision value. With this method the
combochip can achieve manufacturing tolerances
of typically
± 0.04dB in absolute gain for each half
channel, providing the user a significant margin
for error in other board components.
Conversion Laws
The M5913 is designed to operate in both
µ-law
and A-law systems. The user can select either
conversion law according to the voltage present
on the SIGX/ASEL pin . In each case the coder
and decoder process a companded 8-bit PCM
word following CCITT recommandation G.711 for
µ-law and A-law conversion. If A-law operation is
desired, SIGX should be tied to VBB. Thus, signal-
ing is not allowed during A-law operation. If
µ =
255-law operation is selected, then SIGX is a TTL
level input which modifies the LSB on the PCM
output in signaling frames
TRANSMIT OPERATION
Transmit Filter
The input section provides gain adjustment in the
passband by means of an on-chip uncommitted
operational amplifier. This operational amplifier
has a common mode range of 2.17V, a maximum
DC offset of 25mV, a minimum voltage gain of
5000, and a unity gain bandwidth of typically
1MHz. Gain of up to 20dB can be set without de-
grading the performance of the filter. The load im-
pedance to ground (GRDA) at the amplifier output
(GSX) must be greater than 10k
Ω in parallel high
less than 50pF. The input signal on lead VFXI+
can be either AC or DC coupled. The input op
amp can also be used in the inverting mode or
differential amplifier mode (see figure 3).
A low pass anti-aliasing section is included on-
chip. This section typically provides 35dB attenu-
ation at the sampling frequency. No external com-
ponents are required to provide the necessary
anti-aliasing function for the switched capacitor
section of the transmit filter.
The passband section provides flatness and stop-
band attenuation which fulfills the AT&T D3/D4
channel bank transmission specification and
CCITT recommendation G.712.
The M5913 specifications meet or exceed digital
class 5 central office switching systems require-
ments. The transmit filter transfer characteristics
and specifications will be within the limits shown
the relative table.
A high pass section configuration was chosen to
reject low frequency noise from 50 and 60Hz
power lines, 17Hz European electric railroads,
ringing frequencies and their harmonics, and
other low frequency noise.
Even though there is high rejection at these fre-
quencies, the sharpness of the band edge gives
low attenuation at 200Hz. This feature allows the
use of low-cost transformer hybrids without exter-
nal components.
M5913
5/17




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