Bose T1 ToneMatch, Руководство по обслуживанию

Страница: 62 / 70

62
IC Diagrams
CS4272, Codec
PIN DESCRIPTIONS
C E T U M B O T X
- B T U O A I T X
+ B T U O A K L C M
+ A T U O A K C R L
- A T U O A K L C S
SDOUT (M/S C E T U M A )
+ T L I F N I D S
D N G A D N G D
A V D V
- B N I A L V
+ B N I A 0 M
+ A N I A 1 M
I2S/LJ AINA-
RST VCOM
1
2
3
4
5
6
7
1 2 8
22
23
24
25
26
27
28
9
10
11
7 1 2 1
18
19
20
13
5 1 4 1
16
28-Pin TSSOP
2.5 V to 5 V
Left and
Right Mute
Controls
∆Σ Modulator
∆Σ Modulator
Low-Latency
Anti-Alias Filter
External
Mute Control
Register / Hardware
Configuration
Internal Voltage
Reference
Internal
Oscillator
Volume
Control
Mi
xe
r
Selectable
Interpolation
Filter
Selectable
Interpolation
Filter
Reset
Left
Differential
Output
Right
Differential
Output
Switched Capacitor
DAC and Filter
Multibit
Oversampling
ADC
Multibit
Oversampling
ADC
Low-Latency
Anti-Alias Filter
High Pass Filter &
DC Offset Calibration
High Pass Filter &
DC Offset Calibration
PC
M Se
ri
a
l
Inte
rfac
e
/
Loo
pba
c
k
Left
Differential
Input
Right
Differential
Input
Volume
Control
L
e
ve
l T
ra
n
slator
Le
v
e
l Tra
n
s
lat
o
r
Serial
Audio
Input
Serial
Audio
Output
3.3 V to 5 V 5 V
Hardware or
I
2
C/SPI
Control Data
Switched Capacitor
DAC and Filter
BLOCK DIAGRAM
Pin Name # Pin Description
XTO
XTI
1,2
Crystal Connections
(
Input/Output
) - I/O pins for an external crystal which may be used to generate the
master clock.
MCLK
3
Master Clock (
Input/Output
) -Clock source for the delta-sigma modulators.
LRCK 4
Left Right Clock
(Input/Output
) - Determines which channel, Left or Right, is currently active on the
serial audio data line.
SCLK
5
Serial Clock
(Input/Output
) - Serial clock for the serial audio interface.
SDOUT
(M/S)
6
Serial Audio Data Output (
Output
) - Output for two’s complement serial audio data. This pin must be
pulled-up or pulled-down to select Master or Slave Mode.
SDIN
7
Serial Audio Data Input (
Input
) - Input for two’s complement serial audio data.
DGND
8
Digital Ground (
Input
) - Ground reference for the internal digital section.
VD 9 Digital Power (
Input
) - Positive power for the internal digital section.
VL
10
Logic Power (
Input
) - Positive power for the digital input/output interface.
M0
11
Mode Select 0 (
Input
) - In conjunction with M1, selects operating mode. Functionality is described in the
Hardware Mode Speed Configuration table.
M1 12
Mode Select 1 (
Input
) - In conjunction with M0, selects operating mode. Functionality is described in the
Hardware Mode Speed Configuration table.
I2S/LJ
13
Serial Audio Interface Select
(Input)
- Selects either the left-justified or I
2
S format for the Serial Audio
Interface.
RST
14
Reset (
Input
) - The device enters a low power mode when this pin is driven low.
VCOM
15
Common Mode Voltage (
Output
) - Filter connection for internal common mode voltage.
AINA-
AINA+
AINB+
AINB-
16,
17,
18,
19
Differential Analog Input (
Input
) - The full scale differential input signals are presented to the delta-
sigma modulators. The full scale level is specified in the ADC Analog Characteristics specification table.
VA 20 Analog Power
(Input)
- Positive power for the internal analog section.
AGND
21
Analog Ground (
Input
) - Ground reference for the internal analog section.
FILT+
22
Positive Voltage Reference (
Output
) - Positive reference voltage for the internal sampling circuits.
AMUTEC
23
Channel A Mute Control
(Output)
- This pin is active during power-up initialization, reset, muting, when
master clock to left/right clock frequency ratio is incorrect, or power-down.
AOUTA-
AOUTA+
AOUTB+
AOUTB-
24,
25,
26,
27
Differential Analog Audio Output (
Output
) - The full scale differential output level is specified in the
Analog Characteristics specification table.
BMUTEC
28
Channel B Mute Control
(Output)
- This pin is active during power-up initialization, reset, muting, when
master clock to left/right clock frequency ratio is incorrect, or power-down.