Datasheet 搜索 > 编解码器 > ADI（亚德诺） > AD1938WBSTZ 数据手册 > AD1938WBSTZ 产品设计参考手册 4/32 页
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AD1938WBSTZ 产品设计参考手册 - ADI（亚德诺）
制造商:
ADI（亚德诺）
分类:
编解码器
封装:
LQFP-48
描述:
ANALOG DEVICES AD1938WBSTZ 音频编解码器, AEC-Q100, 立体声, 4, 8, -40 °C, 105 °C, 192 kSPS
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
原理图在P9P10P11P12P13P14P15P16P17
型号编码规则在P26
导航目录
AD1938WBSTZ数据手册
Page:
of 32 Go
若手册格式错乱，请下载阅览PDF原文件
UG-045 Evaluation Board User Guide
Rev. 0 | Page 4 of 32
08421-005
JP5
AVDD2
AVDD1
DVDD
JP6 JP7
POWER SELECTION
Figure 5. AD1938 Power Jumpers
SETTING UP THE MASTER CLOCK (MCLK)
The evaluation board has a series of jumpers that give the user
great flexibility in the MCLK clock source for the AD1938.
MCLK can come from six different sources: passive crystal,
active oscillator, external clock in, S/PDIF receiver, and two
header connections. Note that the complex programmable logic
device (CPLD) on the board must have a valid clock source; the
frequency is not critical. These jumper blocks can assign the
CPLD clock as well. Most applications of the board use MCLK
from either the S/PDIF receiver or one of the header (HDR)
inputs. Figure 6 to Figure 9 show the on-board active oscillator
disabled so that it does not interfere with the selected clock. The
clock feed to the CPLD comes directly from the clock source.
Note that, if the HDR connectors are to be driven with MCLK
from a source on the evaluation board, SW2 and/or SW3 must
be switched from the IN position to the OUT position.
08421-006
JP31
HDR1
JP30
HDR2
JP29
8416
JP28
CLK
JP24
OSC
R155
R156
C154
C153
MCLKI
XTAL
MCLKO
XTAL
R166
R178
MCLKI BUS
MCLKO BUS
JP27
HDR1
JP25
HDR2
JP23
CPLD
OSC DISABLE
193X_MCLKI
DISABLE
EXT
EXT CLK IN
193X_MCLKO
1938_MCLKI
R160
R167
R169
R172
R174
R175
C168
C170
JP22
C158
L7
JP19
JP18 JP20
C147
U21
U18
U22
Y1
J23
J22
Figure 6. S/PDIF Receiver as MCLK Master; the AD1938 and CPLD as Slaves
08421-007
JP31
HDR1
JP30
HDR2
JP29
8416
JP28
CLK
JP24
OSC
R155
R156
C154
C153
MCLKI
XTAL
MCLKO
XTAL
R166
R178
MCLKI BUS
MCLKO BUS
JP27
HDR1
JP25
HDR2
JP23
CPLD
OSC DISABLE
193X_MCLKI
DISABLE
EXT
EXT CLK IN
193X_MCLKO
1938_MCLKI
R160
R167
R169
R172
R174
R175
C168
C170
JP22
C158
L7
JP19
JP18 JP20
C147
U21
U18
U22
Y1
J23
J22
Figure 7. HDR1 as MCLK Master; the AD1938, CPLD, and HDR2 as Slaves
08421-008
JP31
HDR1
JP30
HDR2
JP29
8416
JP28
CLK
JP24
OSC
R155
R156
C154
C153
MCLKI
XTAL
MCLKO
XTAL
R166
R178
MCLKI BUS
MCLKO BUS
JP27
HDR1
JP25
HDR2
JP23
CPLD
OSC DISABLE
193X_MCLKI
DISABLE
EXT
EXT CLK IN
193X_MCLKO
1938_MCLKI
R160
R167
R169
R172
R174
R175
C168
C170
JP22
C158
L7
JP19
JP18 JP20
C147
U21
U18
U22
Y1
J23
J22
Figure 8. External Clock In as Master; the AD1938 and CPLD as Slaves
08421-009
JP31
HDR1
JP30
HDR2
JP29
8416
JP28
CLK
JP24
OSC
R155
R156
C154
C153
MCLKI
XTAL
MCLKO
XTAL
R166
R178
MCLKI BUS
MCLKO BUS
JP27
HDR1
JP25
HDR2
JP23
CPLD
OSC DISABLE
193X_MCLKI
DISABLE
EXT
EXT CLK IN
193X_MCLKO
1938_MCLKI
R160
R167
R169
R172
R174
R175
C168
C170
JP22
C158
L7
JP19
JP18 JP20
C147
U21
U18
U22
Y1
J23
J22
Figure 9. Active On-Board Oscillator as Master; the AD1938 and
CPLD as Slaves
The MCLK configurations shown in Figure 10 and Figure 11 use
the AD1938 MCLKO port to drive the CPLD and, possibly, the
HDRs. The passive crystal runs the AD1938 at 12.288 MHz.
Figure 11 shows the MCLKI shut off; this is the case when the
PLL is set to LRCLK instead of MCLK.
08421-010
JP31
HDR1
JP30
HDR2
JP29
8416
JP28
CLK
JP24
OSC
R155
R156
C154
C153
MCLKI
XTAL
MCLKO
XTAL
R166
R178
MCLKI BUS
MCLKO BUS
JP27
HDR1
JP25
HDR2
JP23
CPLD
OSC DISABLE
193X_MCLKI
DISABLE
EXT
EXT CLK IN
193X_MCLKO
1938_MCLKI
R160
R167
R169
R172
R174
R175
C168
C170
JP22
C158
L7
JP19
JP18
JP20
C147
U21
U18
U22
Y1
J23
J22
Figure 10. Passive Crystal; AD1938 Is Master; CPLD Is Slave from
the MCLKO Port
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