TCM320AC46 Datasheet, PDF (2/19 Pages) Texas Instruments – GEBERAL-PURPOSE AUDIO INTERFACE FOR DSP

TCM320AC46
ą
GENERALĆPURPOSE AUDIO INTERFACE FOR DSP
ą
SLWS001 − D4091, JUNE 1993
description (continued)
The receive section takes a frame of serial data on DIN and converts it to analog through an expanding
digital-to-analog converter (EXDAC) if the companded mode is selected; otherwise, a linear conversion is
performed. The analog signal then passes through switched-capacitor filters, which provide out-of-band
rejection, (sin x)/x correction functions, and smoothing. The filtered signal is sent to the earphone amplifier. The
earphone amplifier has a differential output with adjustable gain that is designed to minimize static power
dissipation.
A single on-chip, high-precision band-gap circuit generates all voltage references, eliminating the need for
external reference voltages.
The TCM320AC46 device is characterized for operation from 0°C to 70°C.
functional block diagram
6
MICMUTE
18
MICIN
19
MICGS
VMID ¹⁷
MICBIAS ²⁰
Input
Buffer
Transmit
Third-Order
Antialias
VMID
Band-Gap
Voltage
Reference
VMID
Generator
Transmit
Sixth-Order
Low Pass
Transmit
First-Order
High Pass
256 kHz
8 kHz
LINSEL
15
ADC
Output
Logic
13 _DOUT
12 _FSX
A/D
Converter
Voltage
Reference
256 kHz
D/A
Converter
Voltage
Reference
8 kHz
Autozero
Clock
Generator
Clock
Control
14 _TSX/DCLKX
11 _CLK
7
DCLKR
EARA ²
EARB ³
EARGS ⁴
10
EARMUTE
Earphone
Amplifier
Receive
Buffer
256 kHz
Receive
Filter
5
VCC
16
1
GND PDN
DAC
15
LINSEL
Input
Logic
9
FSR
8 _DIN
2
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