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| 型号： | AD7694BRMZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT SRL 250KSPS 8MSOP |
| 标准包装： | 50 |
| 系列： | PulSAR® |
| 位数： | 16 |
| 采样率（每秒）： | 250k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 6.3mW |
| 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： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 管件 |
| 输入数目和类型： | 1 个差分，单极 |
| 配用： | EVAL-AD7694CBZ-ND - BOARD EVALUATION FOR AD7694 |
AD7694
Rev. A | Page 14 of 16
Table 9. Recommended Driver Amplifiers
Amplifier
Typical Application
Very low noise and high frequency
Low noise and high frequency
Low power, low noise, and low frequency
5 V single-supply and low power
Small, low power, and low frequency
High frequency and low power
VOLTAGE REFERENCE INPUT
The AD7694 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
example, an unbuffered reference voltage like the low
temperature drift ADR43x reference or a reference buffer using
chip capacitor is appropriate for optimum performance.
If desired, smaller reference decoupling capacitor values down
to 2.2 μF can be used with a minimal impact on performance,
especially DNL.
POWER SUPPLY
The AD7694 powers down automatically at the end of each
conversion phase and, therefore, the power scales linearly with
the sampling rate, as shown in Figure 22. This makes the part
ideal for a low sampling rate (even a few Hz) and low battery-
powered applications.
10,000
1,000
100
10
1
0.1
0.01
10
100
1k
10k
100k
1M
05003-022
SAMPLING RATE (SPS)
OP
E
RATING
CURRE
NT
(
μA)
VDD = 5V
VDD = 2.7V
Figure 22. Operating Current vs. Sampling Rate
SUPPLYING THE ADC FROM THE REFERENCE
For simplified applications, the AD7694, with its low operating
current, can be supplied directly using the reference circuit, as
shown in Figure 23. The reference line can be driven by either
The system power supply directly
A reference voltage with enough current output capability,
such as the ADR43x
A reference buffer, such as the AD8031, that can also filter
the system power supply, as shown in Figure 23
05003-023
AD8031
AD7694
REF
VDD
2.2
TO
10
μF
1
μF
10
Ω
10k
Ω
5V OR 3V
5V
OR
3V
5V OR 3V
1
μF
(NOTE 1)
NOTES
1. OPTIONAL REFERENCE BUFFER AND FILTER.
Figure 23. Example of an Application Circuit
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