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PDF UCB1200 Data sheet ( Hoja de datos )
| Número de pieza | UCB1200 | |
| Descripción | Advanced modem/audio analog front-end | |
| Fabricantes | NXP Semiconductors | |
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( DataSheet : www.DataSheet4U.com )
INTEGRATED CIRCUITS
DATA SHEET
UCB1200
Advanced modem/audio analog
front-end
Product specification
File under Integrated Circuits, <Handbook>
1998 Jul 22
www.DataSheet4U.com
1 page  
Philips Semiconductors
Advanced modem/audio analog front-end
Product specification
UCB1200
SYMBOL
PIN
DESCRIPTION
RESET
STATE
TYPE(1)
SIBDOUT
SIBCLK
SIBDIN
IRQOUT
n.c
40 SIB data output
41 SIB serial interface clock
42 SIB data input
43 interrupt output
44 not connected
‘1’(6)
−
−
‘0’
−
OC
IC
IC
OC
−
IO4
IO5
IO6
VDDD
45 general purpose I/O pins
46 general purpose I/O pins
47 general purpose I/O pins
48 digital supply
input
input
input
−
I/OC
I/OC
I/OC
S
Notes
1. I/OC = CMOS bidirectional; ID = digital input; S = supply; OA = analog output; IC = CMOS input; IA = analog input;
I/OA = analog bidirectional; OC = CMOS output.
2. VSSD (pins 5 and 37) and VSSA1 (pin 18) are connected internally within the UCB1200.
3. SKPRN/SPKRP (pins 8 and 9), TINN/TINP (pins 14 and 15) and TOUTP/TOUTN are differential pairs
4. TEST (pin 13) is connected to an internal pull-down resistor. This pin should be held LOW during normal operation
of the circuit.
5. The not connected pins (pins 6, 19, 31 and 44) are reserved for future applications and should be left floating.
6. SIBDOUT reset state is 1 until the SIB bus is running. SIBDOUT will be active once the SIB bus has started.
1998 Jul 22
5
5 Page 
Philips Semiconductors
Advanced modem/audio analog front-end
Product specification
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.
TEL_SIDE_ENA
TEL_LOOP
TEL_ATT
TINP
TINN
SIDETONE
SUPPRESSION
CIRCUIT
1bit ADC
DIGITAL
14
DECIMATION
FILTER
TEL_IN_ENA
TEL_OUT_ENA
TOUTP
TOUTN
4bit DAC
DIGITAL
NOISE
SHAPER
14
TEL_MUTE
Fig.7 Telecom codec block diagram.
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:
fst = (---6---4--(--2-×----×-T----FE----S-L--I-_-B---DC----LI--VK----[)-n----]--)
(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
1998 Jul 22
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet UCB1200.PDF ] | |
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