參數(shù)資料
型號: AD7858LANZ
廠商: Analog Devices Inc
文件頁數(shù): 28/32頁
文件大?。?/td> 0K
描述: IC ADC 12BIT 8CHAN SRL 24DIP
標準包裝: 15
位數(shù): 12
采樣率(每秒): 100k
數(shù)據(jù)接口: 8051,QSPI?,串行,SPI? µP
轉換器數(shù)目: 2
功率耗散(最大): 33mW
電壓電源: 模擬和數(shù)字
工作溫度: -40°C ~ 85°C
安裝類型: 通孔
封裝/外殼: 24-DIP(0.300",7.62mm)
供應商設備封裝: 24-PDIP
包裝: 管件
輸入數(shù)目和類型: 8 個單端,單極;4 個偽差分,單極
AD7858/AD7858L
REV. B
–5–
TYPICAL TIMING DIAGRAMS
Figures 2 and 3 show typical read and write timing diagrams for
serial Interface Mode 2. The reading and writing occurs after
conversion in Figure 2, and during conversion in Figure 3. To
attain the maximum sample rate of 100 kHz (AD7858L) or
200 kHz (AD7858), reading and writing must be performed
during conversion as in Figure 3. At least 400 ns acquisition
time must be allowed (the time from the falling edge of BUSY
to the next rising edge of
CONVST) before the next conversion
begins to ensure that the part is settled to the 12-bit level. If the
user does not want to provide the
CONVST signal, the conver-
sion can be initiated in software by writing to the control register.
1.6mA
200 A
IOL
IOH
TO
OUTPUT
PIN
CL
100pF
+2.1V
Figure 1. Load Circuit for Digital Output Timing
Specifications
tCONVERT = 4.6 s MAX, 10 s MAX FOR L VERSION
t1 = 100ns MIN, t4 = 50/90ns MAX 5V/3V, t7 = 40/60ns MIN 5V/3V
t1
tCONVERT
t3
t4
t6
t2
t6
t9
t10
t11
t12
t7
t8
THREE-STATE
15
6
16
DB15
DB11
DB0
DB15
DB11
DB0
CONVST (I/P)
BUSY (O/P)
SYNC (I/P)
SCLK (I/P)
DOUT (O/P)
DIN (I/P)
THREE-
STATE
Figure 2. AD7858/AD7858L Timing Diagram for Interface Mode 2 (Reading/Writing After Conversion)
tCONVERT = 4.6 s MAX, 10 s MAX FOR L VERSION
t1 = 100ns MIN, t4 = 50/90ns MAX 5V/3V, t7 = 40/60ns MIN 5V/3V
t1
tCONVERT
t3
t4
t6
t2
t6
t9
t10
t11
t12
t7
t8
THREE-STATE
15
6
16
DB15
DB11
DB0
DB15
DB11
DB0
CONVST (I/P)
BUSY (O/P)
SYNC (I/P)
SCLK (I/P)
DOUT (O/P)
DIN (I/P)
THREE-
STATE
Figure 3. AD7858/AD7858L Timing Diagram for Interface Mode 2 (Reading/Writing During Conversion)
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