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参数资料
| 型号： | AD7797BRUZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 24BIT SIG-DEL 1CH 16TSSOP |
| 标准包装： | 2,500 |
| 位数： | 24 |
| 采样率（每秒）： | 123 |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 1.6mW |
| 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： | 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；1 个差分，双极 |
| 配用： | EVAL-AD7797EBZ-ND - BOARD EVALUATION FOR AD7797 |
AD7796/AD7797
Rev. A | Page 16 of 24
ADC CIRCUIT INFORMATION
OVERVIEW
The AD7796/AD7797 are low power ADCs that incorporate a
Σ-Δ modulator, in-amp, and an on-chip digital filter intended
for measuring wide dynamic range, low frequency signals, such
as those in pressure transducers and weigh scales.
Each part has one differential input that is buffered. Figure 10
shows the basic connections required to operate the part.
AD7796/AD7797
AIN(+)
AIN(–)
INTERNAL
CLOCK
AVDD
DVDD
REFIN(–)
REFIN(+)
DOUT/RDY
DIN
SCLK
MUX
GND
CLK
Σ-Δ
ADC
VDD
×128
TEMP
SENSOR
SERIAL
INTERFACE
AND
CONTROL
LOGIC
CS
IN+
IN–
OUT–
OUT+
06
08
3-
01
0
Figure 10. Basic Connection Diagram
The output rate of the AD7796/AD7797 (fADC) is user-
programmable. The allowable update rates, along with the
corresponding settling times, are listed in Table 14. Normal
mode rejection is the major function of the digital filter.
Simultaneous 50 Hz and 60 Hz rejection is optimized when the
update rate equals 16.7 Hz or less because notches are placed at
both 50 Hz and 60 Hz with these update rates (see Figure 12).
The AD7796/AD7797 use slightly different filter types,
depending on the output update rate used to optimize the
rejection of quantization noise and device noise. When the
update rate is 4.17 Hz to 12.5 Hz, a Sinc3 filter and an averaging
filter are used. When the update rate is 16.7 Hz to 33.2 Hz,
a modified Sinc3 filter is used. This filter gives simultaneous
50 Hz/60 Hz rejection when the update rate equals 16.7 Hz.
A Sinc4 filter is used when the update rate is from 50 Hz to
the different filter types for some of the update rates.
0
–20
–40
–60
–80
–100
01
100
80
60
40
20
FREQUENCY (Hz)
(d
B
)
20
06
08
3-
01
1
Figure 11. Filter Profile with Update Rate = 4.17 Hz
0
–20
–40
–60
–80
–100
02
180
160
140
120
100
80
60
40
20
FREQUENCY (Hz)
(d
B
)
00
06
08
3-
01
2
Figure 12. Filter Profile with Update Rate = 16.7 Hz
0
–20
–40
–60
–80
–100
0
1000
900
800
700
600
500
400
300
200
100
FREQUENCY (Hz)
(d
B
)
06
08
3-
01
3
Figure 13. Filter Profile with Update Rate = 50 Hz
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