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PDF SA5753DK Data sheet ( Hoja de datos )

Número de pieza SA5753DK
Descripción Audio processor - filter and control section
Fabricantes Philips 
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INTEGRATED CIRCUITS
SA5753
Audio processor — filter and control
section
Product specification
Replaces data of 1995 July 7
IC17 Data Handbook
1997 Nov 07
Philips
Semiconductors

1 page




SA5753DK pdf
Philips Semiconductors
Audio processor – filter and control section
Product specification
SA5753
AC ELECTRICAL CHARACTERISTICS (continued)
SYMBOL
PARAMETER
LIMITS
TEST CONDITIONS
UNIT
MIN TYP MAX
TX overall gain
3kHz
8 9 9.6 dBm0
TX overall gain
5.9kHz
-52 -45 dBm0
TX BPF dynamic range
TBD
dB
PREMPIN input impedance
TXOUT Slew rate
Output impedance
f = 3kHz
CL = 15pF
f = 3kHz
100 k
0.75 V/µs
40
Output swing (limiting)
Output swing (1% THD)
Tx DTMF signal with TXLPF and pre-emphasis
5kload (25°C)
1.2
1.0
0.45
VP-P
VP-P
V/kHz
Rx DTMF sidetone
–0.8 5.2 dBm0
Time delay to mute from RX MUTE or TX MUTE
transition
VIN = VIL to VIH
VIN = VIH to VIL
0.5 µs
0.5 µs
Table 1. Gain Control Blocks (Bit 0 is Least Significant Bit)
SYMBOL
Bits
TYPICAL STEP (dB)
A1
A2a
A2b
A3
A4
A6
A7
NAMPS
VCO
For A2a, A4 and A7:
For all Gain Blocks:
4 –0.8
5 ±0.25
2 –6, (–12 on first)
4 –1.0
4 ±0.5
4 –2.0
4 ±0.5
1
1
MSB sets the sign of the gain
MSB = 0 for gain
MSB = 1 for attenuation
All bits set to 0 = 0dB gain
All bits set to 1 = maximum gain or attenuation
TYPICAL GAIN (dB)
MIN MAX
–12.0
0
–3.75
+3.75
–24.0
0
–17.0
–2.0
–3.5 +3.5
–30.0
0
–3.5 +3.5
+1.9 in A2b
–7.6 in A4
+6.0 in A4
FUNCTIONAL DESCRIPTION
The SA5753 is an audio signal processor designed to meet the
requirements of compact low voltage radio telephone equipment. It
includes transmit and receive bandpass filters for voiceband
(300-3000Hz) with pre-emphasis and de-emphasis respectively, a
transmit peak deviation limiter, voice channel mute switches and a
data path which can be summed into the transmit channel. An I2C
interface is provided for software programmability of a DTMF
generator, mute polarity, selection of different power down and
operating modes and control of the gain in both the transmit and
receive channels.
Software programmable gain control allows the device to be
automatically optimized during equipment production and offers
flexibility during normal operation.
Gain Blocks
The programmable gain blocks are shown in Table 1 and Figure 2.
The purpose for each block is as follows:
a. A1 compensates for microphone gain variations in the transmit
path.
b. A2a compensates for transmitter dynamic range variations due to
manufacturing tolerances of the SA5753 and SA5752 compandor
companion device. To meet AMPS requirements, the dynamic
range between the zero crossing signal level of the compandor
and the peak signal allowed by the deviation limiter is adjusted to
12.34dB.
c. A2b allows coarse attenuation to be inserted in the transmit path
to eliminate positive feedback effects in hands-free speaker
applications. First step is 12dB followed by two steps of 6dB.
d. A3 sets the gain between the DATAIN pin (Pin 19) and the TXOUT
pin (Pin 20) and should be adjusted after A2a and A4 have been
previously optimized. The SA5753 will interface directly with the
UMA1000T data processor (which produces a 2Vpk data signal).
For NAMPS applications an additional 10 to 14dB resistive divider
must be added at the DATAIN pin (Pin 19) for a 2V data signal.
1997 Nov 07
5

5 Page





SA5753DK arduino
Philips Semiconductors
Audio processor – filter and control section
Product specification
SA5753
Companding and Amplifier Section
SA5752
MICROPHONE
PREAMP
NOISE
CANCEL
GAIN
CONTROL
VOX
OUTPUT
VOX
COMPRESSOR
Filter and Control Section
SA5753
TX
BANDPASS
FILTER
SUMMING
AMP
TX
PRE–
EMPHASIS
TX
LOW
PASS
FILTER
AUDIO TO
TRANSMITTER
HEADPHONE
SPEAKER
EXPANDOR
RX
DE–
EMPHASIS
RX
BANDPASS
FILTER
DTMF
GENERATOR
AUDIO FROM
RECEIVER
DEMODULATOR
PA
PA
TDA7050T
ATTENUATOR
I2C
BUS
INTERFACE
VOX CONTROL
CLOCK
1.2MHz
FROM SYSTEM
CONTROLLER I 2C BUS
Figure 4. Typical Configuration of Audio Processor (APROC) System Chip Set
SR00661
1997 Nov 07
11

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