参数资料
型号: AD7927BRU
厂商: Analog Devices Inc
文件页数: 24/28页
文件大小: 0K
描述: IC ADC 12BIT 8CH 200KSPS 20TSSOP
标准包装: 75
位数: 12
采样率(每秒): 200k
数据接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
转换器数目: 1
功率耗散(最大): 7.5mW
电压电源: 单电源
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 20-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 20-TSSOP
包装: 管件
输入数目和类型: 8 个单端,单极
配用: EVAL-AD7927CBZ-ND - BOARD EVALUATION FOR AD7927
Data Sheet
AD7927
Rev. D | Page 5 of 28
TIMING SPECIFICATIONS1
AVDD = 2.7 V to 5.25 V, VDRIVE ≤ AVDD, REFIN = 2.5 V; TA = TMIN to TMAX, unless otherwise noted.
Table 2.
Parameter
Limit at TMIN, TMAX AD7927
Description
AVDD = 3 V
AVDD = 5 V
Unit
10
kHz min
20
MHz max
tCONVERT
16 × tSCLK
tQUIET
50
ns min
Minimum quiet time required between CS rising edge and start of
next conversion
t2
10
ns min
CS to SCLK setup time
35
30
ns max
Delay from CS until DOUT three-state disabled
40
ns max
Data access time after SCLK falling edge
t5
0.4 × tSCLK
ns min
SCLK low pulsewidth
t6
0.4 × tSCLK
ns min
SCLK high pulsewidth
t7
10
ns min
SCLK to DOUT valid hold time
15/45
15/35
ns min/max
SCLK falling edge to DOUT high impedance
t9
10
ns min
DIN setup time prior to SCLK falling edge
t10
5
ns min
DIN hold time after SCLK falling edge
t11
20
ns min
Sixteenth SCLK falling edge to CS high
t12
1
μs max
Power-up time from full power-down/auto shutdown mode
1 Sample tested at 25°C to ensure compliance. All input signals are specified with tr = tf = 5 ns (10% to 90% of AVDD) and timed from a voltage level of 1.6 V,
(see Figure 2). The 3 V operating range spans from 2.7 V to 3.6 V. The 5 V operating range spans from 4.75 V to 5.25 V.
2 Mark/space ratio for the SCLK input is 40/60 to 60/40.
3 Measured with the load circuit of Figure 2 and defined as the time required for the output to cross 0.4 V or 0.7 × VDRIVE.
4 t8 is derived from the measured time taken by the data outputs to change 0.5 V when loaded with the circuit of Figure 2. The measured number is then extrapolated
back to remove the effects of charging or discharging the 50 pF capacitor. This means the time, quoted in the t8 timing characteristics, is the true bus relinquish time
of the part and is independent of the bus loading.
200A
IOL
200A
IOH
1.6V
TO OUTPUT
PIN
CL
50pF
03
08
8-
0
02
Figure 2. Load Circuit for Digital Output Timing Specifications
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