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參數(shù)資料
| 型號： | AD977AAR |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT 200KSPS 20-SOIC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 200k |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 100mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SOIC W |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 3 個(gè)單端，單極；3 個(gè)單端，雙極 |
| 配用： | EVAL-AD977CB-ND - BOARD EVAL FOR AD977 EVAL-AD977ACB-ND - BOARD EVAL FOR AD977A |
AD977/AD977A
–12–
REV. D
For both the AD977 and the AD977A the data should be
clocked out during the first half of
BUSY so not to degrade
conversion performance. For the AD977 this requires use of a
4.8 MHz DATACLK or greater, with data being read out as
soon as the conversion process begins. For the AD977A it
requires use of a 10 MHz DATACLK or greater.
It is not recommended that data be shifted through the TAG
input in this mode as it will certainly result in clocking of data
during the second half of the conversion.
EXTERNAL CONTINUOUS CLOCK DATA READ AFTER
CONVERSION WITH SYNC OUTPUT GENERATED
Figure 8 illustrates the method by which data from conversion
“n” can be read after the conversion is complete using a con-
tinuous external clock, with the generation of a SYNC output.
What permits the generation of a SYNC output is a transition of
DATACLK while either
CS is high or while both CS and R/C are
low.
With a continuous clock the
CS pin cannot be tied low as it
could be with a discontinuous clock. Use of a continuous clock,
while a conversion is occurring, can increase the DNL and
Transition Noise of the AD977/AD977A.
After a conversion is complete, indicated by
BUSY returning
high, the result of that conversion can be read while
CS is low
and R/
C is high. In Figure 8 clock pulse #0 is used to enable the
generation of a SYNC pulse. The SYNC pulse is actually clocked
out approximately 40 ns after the rising edge of clock pulse #1.
The SYNC pulse will be valid on the falling edge of clock pulse
#1 and the rising edge of clock pulse #2. The MSB will be valid
on the falling edge of clock pulse #2 and the rising edge of clock
pulse #3. The LSB will be valid on the falling edge of clock
pulse #17 and the rising edge of clock pulse #18. Approximately
50 ns after the rising edge of clock pulse #18 the DATA output
pin will reflect the state of the TAG input pin during the rising
edge of clock pulse #2.
When reading data after the conversion is complete, with the
highest frequency permitted for DATACLK (15.15 MHz) and,
with the AD977A, the maximum possible throughput is approxi-
mately 195 kHz and not the rated 200 kHz.
For details on use of the TAG input with this mode see the Use
of the TAG Input section.
Figure 8. Conversion and Read Timing Using an External Continuous Data Clock (EXT/
INT Set to Logic High)
CS
BUSY
R/C
BIT 15
(MSB)
BIT 14
t2
TAG 2
BIT 0
(LSB)
TAG 0
TAG 1
TAG 0
TAG 1
TAG 2
TAG 16
TAG 17
TAG 18
TAG 19
t13
0
t14
t12
1
2
3
4
17
18
t1
t15
t16
t17
t19
t24
t12
t23
t18
t16
EXT
DATACLK
TAG
DATA
SYNC
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