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AS3502 Datasheet

  • AS3502

  • 13-BIT LINEAR FEATURE CODEC WITH ANALOGUE FRONTEND

  • 29頁

  • AMSCO

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AS3502
Austria Mikro Systeme International AG
13-BIT LINEAR FEATURE CODEC
WITH ANALOGUE FRONTEND
General Description
AS3502 is a high performance 13-bit linear feature
Codec/Filter with 8 kHz sampling rate specifically
tailored to implement all analogue frontend functions
of battery powered digital terminals. It includes a
programmable analogue interfaces for handset and
handsfree operation with a minimum amount of
external components.
The Codec function of AS3502 uses Sigma-Delta (
危鈭?/div>
)
modulation conversion techniques with 2nd order
modulators and an over sampling rate of 128 for
excellent signal to noise performance. The AS3502
exceeds all CCITT G712 recommendations and the
European ETSI prETS 300085 recommendations.
Digital gain setting stages for transmit and receive
allow to compensate for transducer tolerances and to
set up a handsfree function under software control. A
programmable tone generator allows to generate
DTMF/Call-Progress Tones and alert sounds required
in digital terminals. All programmable functions of
AS3502 are controlled by a 4-wire serial control port
that easily interfaces to any popular micro controller.
The interface to the digital world is accomplished by a
serial PCM interface that supports 16-bit linear format
or 8-bit A-Law format for both non-delayed and
delayed frame synchronzation modes.
Key Features
q
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13-Bit Linear Sigma Delta Codec with Filters
Exceeding ETSI prETS30085 and G712 .
Single Rail 3.0 V ~5.5 V Power Supply.
Typical Power Dissipation of 30 mW at 3 V.
Two Low Noise Microphone Inputs with Internal
Gain Adjust (+16 / +46 dB).
150
鈩?/div>
Push/Pull Earpiece Driver with Internal
Gain Adjust (-12 / +6 dB).
50
鈩?/div>
Loudspeaker Amplifier with up to 50 mW
Output Power.
Push/ Pull Output Driver for Tone Ringer.
On Chip Electret Microphone Voltage Source.
Digital Transmit Gain Setting (-38 / +10 dB).
Digital Receive Gain Setting ( -42 / +6 dB).
Digital Sidetone Control Function ( 0 / -48 dB).
Programmable Call Progress Tone/ DTMF /
Ring Tone Generator.
Analogue and Digital Loopback Modes.
16-Bit Linear / 8-Bit A-Law Switchable Serial
PCM Interface with Non Delayed and Delayed
Timing Modes.
4-Wire Serial Control Interface.
Packaged in SOIC-28, TQFP-64.
Block Diagramme
MIC2+
MIC2-
MIC1+
MIC1-
VOICE
AAF
AGX
+
16/46
dB
SINE
VREF
AGR
-12/+6
dB
DGR
Lin/A-
AS3502
DGX
Lin/A-
ADC
TONE
LOOP
Decimation
Filter
BPF
dB
-38/+10
Comp.
PCM
PCM
TX
TX
TXD
TXS
30K啪
F1-F3,
V1-V3
-
+
VREF
-
+
Freq.
Gen.
SQ.
S1, S2
CP, CP
RP, RO
SG
DC
Seq.
Caden.
Rep.
dB
0/-48
Contr.
MCLK
SCLK
EP+
LPF
EP-
SPK+
+3dB
SPK-
+
DAC
+
V2
LOOP
Interpolation
Filter
LPF
dB
-42/+6
+
Exp.
PCM
PCM
RX
TX
RXS
RXD
DAC
A
GND
POR
Serial Control
GND
DV DD
TRO- TRO+ AV
DD CAP AVSS
POR
CS
SCL
SDI
SDO
REV. M
Page 1
September 1998

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