参数资料
型号: AD73311LARSZ
厂商: Analog Devices Inc
文件页数: 18/36页
文件大小: 0K
描述: IC PROCESSOR FRONT END LP 20SSOP
标准包装: 66
位数: 16
通道数: 2
功率(瓦特): 50mW
电压 - 电源,模拟: 3V
电压 - 电源,数字: 3V
封装/外壳: 20-SSOP(0.209",5.30mm 宽)
供应商设备封装: 20-SSOP
包装: 管件
AD73311
–25–
REV. B
REFCAP
VOLTAGE
REFERENCE
0.1 F
REFOUT
VIN
0.047 F
VINN
VINP
100
CIN
10k
AD73311
Figure 25. Example Circuit for Single-Ended Input
(AC Coupling)
Analog Output
The AD73311’s differential analog output (VOUT) is produced
by an on-chip differential amplifier. The differential output
can be ac-coupled or dc-coupled directly to a load or to an
external amplifier. Figure 26 shows a simple circuit providing
a differential output with ac coupling. The capacitors in this
circuit (COUT) are optional; if used, their value can be chosen
as follows:
COUT
=
1
2
π f C RL
where fC = desired cutoff frequency.
AD73311
RL
VOUTP
VOUTN
(VOUT CHANNEL)
COUT
Figure 26. Example Circuit for Differential Output
Figure 27 shows an example circuit for providing a single-ended
output with ac coupling. The capacitor of this circuit (COUT) is
not optional if dc current drain is to be avoided.
RL
VOUTP
(VOUT CHANNEL)
COUT
VOUTN
AD73311
Figure 27. Example Circuit for Single-Ended Output
Digital Interfacing
The AD73311 is designed to easily interface to most common
DSPs. The SCLK, SDO, SDOFS, SDI and SDIFS must be
connected to the SCLK, DR, RFS, DT and TFS pins of the
DSP respectively. The SE pin may be controlled from a parallel
output pin or flag pin such as FL0–2 on the ADSP-21xx (or XF
on the TMS320C5x) or, where SPORT powerdown is not
required, it can be permanently strapped high using a suitable
pull-up resistor. The
RESET pin may be connected to the sys-
tem hardware reset structure or it may also be controlled using a
dedicated control line. In the event of tying it to the global sys-
tem reset, it is necessary to operate the device in mixed mode,
which allows a software reset, otherwise there is no convenient
way of resetting the device. Figures 28 and 29 show typical
connections to an ADSP-2181 and TMS320C5x respectively.
SDIFS
SDI
SCLK
SDO
SDOFS
TFS
DT
SCLK
DR
RFS
RESETB
SE
FL0
FL1
ADSP-21xx
DSP
AD73311
CODEC
Figure 28. AD73311 Connected to ADSP-2181
SDIFS
SDI
SCLK
SDO
SDOFS
FSX
DX
CLKX
CLKR
DR
RESETB
SE
FSR
XF
TMS320C5x
DSP
AD73311
CODEC
Figure 29. AD73311 Connected to TMS320C5x
Figures 24 and 25 detail dc- and ac-coupled input circuits for
single-ended operation respectively.
REFCAP
VOLTAGE
REFERENCE
0.1 F
REFOUT
VIN
0.047 F
VINN
VINP
100
AD73311
Figure 24. Example Circuit for Single-Ended Input
(DC Coupling)
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