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| 型号： | EVAL-AD7693CBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD7693 |
| 标准包装： | 1 |
| 系列： | PulSAR® |
| ADC 的数量： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 500k |
| 数据接口： | 串行 |
| 输入范围： | ±VREF |
| 在以下条件下的电源（标准）： | 18mW @ 500kSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7693 |
| 已供物品： | 板 |
| 相关产品： | AD7693BRMZRL7-ND - IC ADC 16BIT 500KSPS 10-MSOP AD7693BCPZRL7TR-ND - IC ADC 16BIT 500KSPS 10-LFCSP AD7693BRMZ-ND - IC ADC 16BIT 500KSPS 10-MSOP AD7693BCPZRL-ND - IC ADC 16BIT 500KSPS 10LFCSP |
AD7693
Rev. A | Page 15 of 24
Table 8. Recommended Driver Amplifiers
Amplifier
Typical Application
Very low noise, low power single to differential
Very low noise, small, and low power
5 V single supply, low noise
Very low noise and high frequency
Low noise and high frequency
Low power, low noise, and low frequency
5 V single supply, low power
SINGLE-ENDED-TO-DIFFERENTIAL DRIVER
For applications using a single-ended analog signal, either
bipolar or unipolar, the ADA4941-1 single-ended-to-differential
driver allows for a differential input into the part. The
schematic is shown in Figure 31.
R1 and R2 set the attenuation ratio between the input range and
the ADC range (VREF). R1, R2, and CF are chosen depending on
the desired input resistance, signal bandwidth, antialiasing and
noise contribution. For example, for the ±10 V range with a 4 kΩ
impedance, R2 = 1 kΩ and R1 = 4 kΩ.
R3 and R4 set the common mode on the IN input, and R5 and
R6 set the common mode on the IN+ input of the ADC. The
common mode should be set close to VREF/2; however, if single
supply is desired, it can be set slightly above VREF/2 to provide
some headroom for the ADA4941-1 output stage. For example,
for the ±10 V range with a single supply, R3 = 8.45 kΩ, R4 =
11.8 kΩ, R5 = 10.5 kΩ, and R6 = 9.76 kΩ.
AD7693
REF
GND
VDD
IN+
2.7nF
100nF
2.7nF
IN–
+5V REF
±10V, ±5V, ...
+5.2V
33
10F
R2
CF
ADA4941
R1
R3
100nF
R5
R4
R6
33
06
39
4-
0
29
Figure 31. Single-Ended-to-Differential Driver Circuit
VOLTAGE REFERENCE INPUT
The AD7693 voltage reference input, REF, has a dynamic input
impedance and should therefore be driven by a low impedance
source with efficient decoupling between the REF and GND
pins, as explained in the Layout section.
When REF is driven by a very low impedance source (for
a 10 μF (X5R, 0805 size) ceramic chip capacitor is appropriate
for optimum performance.
If an unbuffered reference voltage is used, the decoupling value
depends on the reference used. For instance, a 22 μF (X5R,
1206 size) ceramic chip capacitor is appropriate for optimum
references.
If desired, smaller reference decoupling capacitor values down
to 2.2 μF can be used with a minimal impact on performance,
especially DNL.
Regardless, there is no need for an additional lower value
ceramic decoupling capacitor (for example, 100 nF) between the
REF and GND pins.
POWER SUPPLY
The AD7693 uses two power supply pins: a core supply, VDD,
and a digital input/output interface supply, VIO. VIO allows
direct interface with any logic between 1.8 V and VDD. To
reduce the supplies needed, the VIO and VDD pins can be tied
together. The AD7693 is independent of power supply sequencing
between VIO and VDD. Additionally, it is very insensitive to
power supply variations over a wide frequency range, as shown
in Figure 32.
50
55
60
65
70
75
80
85
90
95
100
1
10
100
1000
10000
FREQUENCY (kHz)
P
S
RR
(
d
B
)
06
39
4-
03
0
VREF = 5V
Figure 32. PSRR vs. Frequency
The AD7693 powers down automatically at the end of each
conversion phase; therefore, the operating currents and power
scale linearly with the sampling rate (refer to Figure 21). This
makes the part ideal for low sampling rates (even of a few hertz)
and low battery-powered applications.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-AD7693SDZ | 功能描述:数据转换 IC 开发工具 EVAL BOARD 16-bit ADC 500kSPS RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| EVAL-AD7694CB | 制造商:Analog Devices 功能描述: |
| EVAL-AD7694CB1 | 制造商:AD 制造商全称:Analog Devices 功能描述:16-Bit, 250 kSPS PulSAR ADC in MSOP |
| EVAL-AD7694CBZ | 功能描述:BOARD EVALUATION FOR AD7694 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:PulSAR® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| EVAL-AD7694SDZ | 功能描述:数据转换 IC 开发工具 EVALUATION BOARD RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
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