参数资料
| 型号： | AD7828LPZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/16页 |
| 文件大小： | 0K |
| 描述： | IC ADC 8BIT 8CH HS 28-PLCC |
| 产品变化通告： | Product Discontinuance 27/Oct/2011 |
| 标准包装： | 750 |
| 位数： | 8 |
| 采样率（每秒）： | 50k |
| 数据接口： | 并联 |
| 转换器数目： | 3 |
| 功率耗散（最大）： | 100mW |
| 电压电源： | 单电源 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-LCC（J 形引线） |
| 供应商设备封装： | 28-PLCC（11.51x11.51） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 8 个单端，单极 |
AD7824/AD7828
REV. F
–9–
MODE 0
Figure 14 shows the timing diagram for Mode 0 operation. This
mode can only be used for microprocessors that have a WAIT
state facility, whereby a READ instruction cycle can be extended
to accommodate slow memory devices. A READ operation brings
CS and RD low, which starts a conversion. The analog multiplexer
address inputs must remain valid while
CS and RD are low. The
data bus (DB7–DB0) remains in the three-state condition until
conversion is complete. There are two converter status outputs on
the AD7824/AD7828, interrupt (
INT) and ready (RDY), which
can be used to drive the microprocessor READY/WAIT input.
The RDY is an open-drain output (no internal pull-up device) that
goes low on the falling edge of
CS and goes high impedance at the
end of conversion when the 8-bit conversion result appears on the
data outputs. If the RDY status is not required, the external
pull-up resistor can be omitted and the RDY output tied to GND.
The
INT goes low when conversion is complete and returns high
on the rising edge of
CS or RD.
MODE 1
Mode 1 operation is designed for applications where the micropro-
cessor is not forced into a WAIT state. A READ operation takes
CS and RD low, which triggers a conversion (see Figure 15). The
multiplexer address inputs are latched on the rising edge of
RD.
Data from the previous conversion is read from the three-state
data outputs (DB7–DB0). This data may be disregarded if not
required. Note that the RDY output (open drain output) does
not provide any status information in this mode and must be
connected to GND. At the end of conversion,
INT goes low. A
second READ operation is required to access the new conversion
result. This READ operation latches a new address into the multi-
plexer inputs and starts another conversion.
INT returns high at the
end of the second READ operation, when
CS or RD returns high.
A delay of 2.5
s must be allowed between READ operations.
CS
RD
ANALOG
CHANNEL
ADDRESS
RDY
INT
DATA
tCSS
tAS
tRDY
tCRD
tACC2
tDH
tINTH
tAH
tAS
tP
tCSS
tCSH
ADDRESS
VALID
ADDRESS
VALID
DATA
VALID
HIGH IMPEDANCE
Figure 14. Mode 0 Timing Diagram
CS
RD
ANALOG
CHANNEL
ADDRESS
INT
DATA
tCSS
tAS
ADDRESS
VALID
OLD
VALID
ADDRESS
VALID
NEW
VALID
tCSH
tAH
tRD
tCRD
tINTH
tACC1
tDH
tACC1
tDH
tINTH
tAH
tAS
tP
tCSS
tRD
tCSH
Figure 15. Mode 1 Timing Diagram
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