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参数资料
| 型号： | AD7666ASTZRL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT UNIPOLAR 48LQFP |
| 标准包装： | 2,000 |
| 系列： | PulSAR® |
| 位数： | 16 |
| 采样率（每秒）： | 500k |
| 数据接口： | 串行，并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 75mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 2 个伪差分，单极 |
| 配用： | EVAL-AD7666CBZ-ND - BOARD EVALUATION FOR AD7666 |
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AD7666
Rev. 0 | Page 18 of 28
TYPICAL CONNECTION DIAGRAM
Figure 26 shows a typical connection diagram for the AD7666.
Analog Input
Figure 27 shows an equivalent circuit of the input structure of
the AD7666.
The two diodes, D1 and D2, provide ESD protection for the
analog inputs IN and INGND. Care must be taken to ensure
that the analog input signal never exceeds the supply rails by
more than 0.3 V. This will cause these diodes to become
forward-biased and start conducting current. These diodes can
handle a forward-biased current of 100 mA maximum. For
instance, these conditions could eventually occur when the
input buffer’s (U1) supplies are different from AVDD. In such a
case, an input buffer with a short-circuit current limitation can
be used to protect the part.
C2
R1
D1
D2
C1
IN
OR INGND
AGND
AVDD
03033-0-023
Figure 27. Equivalent Analog Input Circuit
This analog input structure allows the sampling of the differen-
tial signal between IN and INGND. Unlike other converters,
INGND is sampled at the same time as IN. By using this
differential input, small signals common to both inputs are
rejected, as shown in Figure 28, which represents the typical
CMRR over frequency with on-chip and external references.
For instance, by using INGND to sense a remote signal ground,
ground potential differences between the sensor and the local
ADC ground are eliminated.
03034-0-028
30
40
50
60
70
80
90
1
10
100
1000
10000
FREQUENCY (kHz)
CMRR
(dB)
EXT REF
REF
Figure 28. Analog Input CMRR vs. Frequency
During the acquisition phase, the impedance of the analog
input IN can be modeled as a parallel combination of capacitor
C1 and the network formed by the series connection of R1 and
C2. C1 is primarily the pin capacitance. R1 is typically 168
and is a lumped component made up of some serial resistors
and the on resistance of the switches. C2 is typically 60 pF and
is mainly the ADC sampling capacitor. During the conversion
phase, where the switches are opened, the input impedance is
limited to C1. R1 and C2 make a 1-pole low-pass filter that
reduces undesirable aliasing effect and limits the noise.
When the source impedance of the driving circuit is low, the
AD7666 can be driven directly. Large source impedances will
significantly affect the ac performance, especially total
harmonic distortion (THD). The maximum source impedance
depends on the amount of THD that can be tolerated. The THD
degrades as a function of the source impedance and the
maximum input frequency, as shown in Figure 29.
03034-0-029
–110
–100
–90
–80
–70
–60
–50
THD
(dB)
1
10
100
1000
INPUT FREQUENCY (kHz)
RS = 20
RS = 500
RS = 50
RS = 100
Figure 29. THD vs. Analog Input Frequency and Source Resistance
Driver Amplifier Choice
Although the AD7666 is easy to drive, the driver amplifier
needs to meet the following requirements:
The driver amplifier and the AD7666 analog input circuit
must be able to settle for a full-scale step of the capacitor
array at a 16-bit level (0.0015%). In the amplifier’s data
sheet, settling at 0.1% to 0.01% is more commonly speci-
fied. This could differ significantly from the settling time at
a 16-bit level and should be verified prior to driver
selection. The tiny op amp AD8021, which combines ultra
low noise and high gain-bandwidth, meets this settling
time requirement even when used with gains up to 13.
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| AD7667ACPZ | 功能描述:IC ADC 16BIT UNIPOLAR 48LFCSP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:PulSAR® 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| AD7667ACPZRL | 功能描述:IC ADC 16BIT UNIPOLAR 48LFCSP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:PulSAR® 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
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