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参数资料
| 型号： | AD977AAR |
| 厂商： | Analog Devices Inc |
| 文件页数： | 23/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT 200KSPS 20-SOIC |
| 标准包装： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 200k |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 100mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC W |
| 包装： | 管件 |
| 输入数目和类型： | 3 个单端，单极；3 个单端，双极 |
| 配用： | EVAL-AD977CB-ND - BOARD EVAL FOR AD977 EVAL-AD977ACB-ND - BOARD EVAL FOR AD977A |
AD977/AD977A
–8–
REV. D
CONVERSION CONTROL
The AD977/AD977A is controlled by two signals: R/
C and CS.
When R/
C is brought low, with CS low, for a minimum of 50 ns,
the input signal will be held on the internal capacitor array and
a conversion “n” will begin. Once the conversion process does
begin, the
BUSY signal will go low until the conversion is com-
plete. Internally, the signals R/
C and CS are OR’d together and
there is no requirement on which signal is taken low first when
initiating a conversion. The only requirement is that there be at
least 10 ns of delay between the two signals being taken low.
After the conversion is complete the
BUSY signal will return
high and the AD977/AD977A will again resume tracking the
input signal. Under certain conditions the
CS pin can be tied
Low and R/
C will be used to determine whether you are initiat-
ing a conversion or reading data. On the first conversion, after
the AD977/AD977A is powered up, the DATA output will be
indeterminate.
Conversion results can be clocked serially out of the AD977/
AD977A using either an internal clock, generated by the
AD977/AD977A, or by using an external clock. The AD977/
AD977A is configured for the internal data clock mode by pull-
ing the EXT/
INT pin low. It is configured for the external clock
mode by pulling the EXT/
INT pin high.
INTERNAL DATA CLOCK MODE
The AD977/AD977A is configured to generate and provide the
data clock when the EXT/
INT pin is held low. Typically CS will
be tied low and R/
C will be used to initiate a conversion “n.”
During the conversion the AD977/AD977A will output 16 bits of
data, MSB first, from conversion “n-1” on the DATA pin. This
data will be synchronized with 16 clock pulses provided on the
DATACLK pin. The output data will be valid on both the
rising and falling edge of the data clock as shown in Figure 3.
After the LSB has been presented, the DATA pin will assume
whatever state the TAG input was at during the start of con-
version, and the DATACLK pin will stay low until another
conversion is initiated.
EXTERNAL DATA CLOCK MODE
The AD977/AD977A is configured to accept an externally sup-
plied data clock when the EXT/
INT pin is held high. This mode
of operation provides several methods by which conversion
results can be read from the AD977/AD977A. The output data
from conversion “n-1” can be read during conversion “n,” or the
output data from conversion “n” can be read after the conver-
sion is complete. The external clock can be either a continuous
or discontinuous clock. A discontinuous clock can be either
t1
t3
t2
t5
t6
t4
t7
CS, R/C
MODE
ACQUIRE
CONVERT
ACQUIRE
CONVERT
BUSY
Figure 2. Basic Conversion Timing
BUSY
R/C
t8
t11
t6
DATACLK
t1
t9
t10
MSB VALID
BIT 14
VALID
BIT 13
VALID
BIT 1
VALID
LSB VALID
t2
12
3
15
16
DATA
Figure 3. Serial Data Timing for Reading Previous Conversion Results with Internal Clock (
CS, EXT/ INT and TAG Set to
Logic Low)
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