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UCB1200 Datasheet(PDF) 11 Page - NXP Semiconductors

Part # UCB1200
Description  Advanced modem/audio analog front-end
Download  54 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

UCB1200 Datasheet(HTML) 11 Page - NXP Semiconductors

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1998 Jul 22
11
Philips Semiconductors
Product specification
Advanced modem/audio analog front-end
UCB1200
TELECOM CODEC
The telecom codec contains an input channel, built up from a 64 times oversampling sigma delta analog to digital
converter (ADC) with digital decimation filters, programmable attenuation and built-in sidetone suppression circuit.
The output path consist of a digital up sample filter, a 64 time oversampling 4 bit digital to analog converter (DAC) circuit
followed by a differential output driver, capable of directly driving a 600
Ω isolation transformer. The output path includes
a mute function. The telecom codec also incorporates a loopback mode, in which codec output path and the input path
are connected in series.
The telecom sample rate (fst) is derived from the SIB interface clock pin (SIBCLK) and is programmable through the SIB
interface. The telecom sample rate is given by the following formula:
(15 < TEL_DIV[n] <128)
For example, a SIBCLK of 9.216 MHz, with a divisor of 40, results in a telecom sample rate of 7.2 kHz. Both the rising
and the falling edges of the SIBCLK are used in case TEL_DIV[n] is set to an odd number. In that case a 50% duty cycle
of the SIBCLK signal is mandatory to obtain time equidistant sampling.
The input path of the telecom codec has a programmable attenuation. It also implements a voice band filter, which
consists of an digital low pass filter, which is a part of the decimation filter. Therefore the pass band of the voice band
Fig.7 Telecom codec block diagram.
TINP
TOUTP
TOUTN
TEL_SIDE_ENA
TEL_LOOP
1bit ADC
DIGITAL
DECIMATION
FILTER
14
TEL_IN_ENA
TEL_OUT_ENA
14
TEL_MUTE
4bit DAC
DIGITAL
NOISE
SHAPER
TINN
SIDETONE
SUPPRESSION
CIRCUIT
TEL_ATT
f
st
2F
SIBCLK
×
()
64
TEL_DIV[n]
×
()
--------------------------------------------------
=


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