参数资料
型号: AD7767BRUZ-RL7
厂商: Analog Devices Inc
文件页数: 9/25页
文件大小: 0K
描述: ADC 24BIT 15MW 128KSPS 16TSSOP
标准包装: 1,000
位数: 24
采样率(每秒): 128k
数据接口: 串行
转换器数目: 1
功率耗散(最大): 18mW
电压电源: 模拟和数字
工作温度: -40°C ~ 105°C
安装类型: 表面贴装
封装/外壳: 16-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 16-TSSOP
包装: 带卷 (TR)
输入数目和类型: 1 个差分,单极
配用: EVAL-AD7767EDZ-ND - BOARD EVAL AD7767 128KSPS 108DB
EVAL-AD7767-1EDZ-ND - BOARD EVAL AD7767-1 64KSPS 111DB
AD7767
Rev. C | Page 16 of
24
0
–20
–40
–60
–80
–100
–120
–140
–160
0
128k
112k
96k
80k
64k
48k
32k
16k
AM
P
L
IT
UD
E
(
d
B
)
FREQUENCY (Hz)
06
85
9-
2
16
Figure 32. AD7767 Digital Filter Frequency Response
0
–20
–40
–60
–80
–100
–120
–140
–160
0
64k
56k
48k
40k
32k
24k
16k
8k
AM
P
L
IT
UD
E
(
d
B
)
FREQUENCY (Hz)
06
85
9-
2
17
Figure 33. AD7767-1 Digital Filter Frequency Response
0
–20
–40
–60
–80
–100
–120
–140
–160
0
32k
28k
24k
20k
16k
12k
8k
4k
AM
P
L
IT
UD
E
(
d
B
)
FREQUENCY (Hz)
06
85
9-
2
18
Figure 34. AD7767-2 Digital Filter Frequency Response
ANALOG INPUT STRUCTURE
The AD7767/AD7767-1/AD7767-2 are configured as a differential
input structure. A true differential signal is sampled between the
analog inputs VIN+ and VIN, Pin 4 and Pin 5, respectively. Using
differential inputs provides rejection of signals that are common
to both the VIN+ and VIN pins.
Figure 35 shows the equivalent analog input circuit of the
AD7767/AD7767-1/AD7767-2. The two diodes on each of the
differential inputs provide ESD protection for the analog inputs.
06
85
9-
21
9
VIN+
VREF+
C1
D
GND
AGND
RIN
C2
VIN–
VREF+
C1
D
GND
AGND
RIN
C2
Figure 35. Equivalent Analog Input Structure
Take care to ensure that the analog input signal does not exceed
the reference supply voltage (VREF+) by more than 0.3 V, as specified
in the Absolute Maximum Ratings section. If the input voltage
exceeds this limit, the diodes become forward biased and start
to conduct current. The diodes can handle 130 mA maximum.
The impedance of the analog inputs can be modeled as a parallel
combination of C1 and the network formed by the series con-
nection of RIN, C1, and C2. The value of C1 is dominated by the
pin capacitance. RIN is typically 1.4 kΩ, the lumped component
of serial resistors and the RON of the switches. C2 is typically
22 pF, and its value is dominated by the sampling capacitor.
SUPPLY AND REFERENCE VOLTAGES
The AD7767/AD7767-1/AD7767-2 operate from a 2.5 V supply
applied to the DVDD and AVDD pins. The interface is specified to
operate between 1.7 V and 3.6 V. The AD7767/AD7767-1/
AD7767-2 operate from a reference input in the range of 2.2 V
to 2 × AVDD applied to the VREF+ pin. The nominal reference
supply voltage is 5 V, but a 2.5 V supply can also be used. When
using a 5 V reference, the recommended reference devices are
the ADR445, ADR435, or ADR425; when using 2.5 V, the ADR441,
ADR431, or ADR421 are recommended. The voltage applied to
the reference input (VREF+) operates both as a reference supply
and as a power supply to the AD7767/AD7767-1/AD7767-2
device. Therefore, when using a 5 V reference input, the full-scale
differential input range of the AD7767/AD7767-1/AD7767-2
is 10 V. See the Driving the AD7767 section for details on the
maximum input voltage.
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