参数资料
型号: AD7858LBNZ
厂商: Analog Devices Inc
文件页数: 28/32页
文件大小: 0K
描述: IC ADC 12BIT 8CHAN SRL 24DIP
产品变化通告: Product Discontinuance 27/Oct/2011
标准包装: 15
位数: 12
采样率(每秒): 100k
数据接口: 8051,QSPI?,串行,SPI? µP
转换器数目: 2
功率耗散(最大): 33mW
电压电源: 模拟和数字
工作温度: -40°C ~ 85°C
安装类型: 通孔
封装/外壳: 24-DIP(0.300",7.62mm)
供应商设备封装: 24-PDIP
包装: 管件
输入数目和类型: 8 个单端,单极;4 个伪差分,单极
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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