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參數資料
| 型號： | AD7782 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Read Only, Pin Configured 24-Bit ADC |
| 中文描述： | 只讀，引腳配置24位ADC |
| 文件頁數： | 7/12頁 |
| 文件大小： | 126K |
| 代理商： | AD7782 |
REV. 0
AD7782
–7–
Typical Performance Characteristics
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1
9
TPC 1. Noise Distribution Histogram
ADC CIRCUIT INFORMATION
Overview
The AD7782 incorporates an analog multiplexer with a
Σ
-
ADC
channel, on-chip programmable gain amplifier, and on-chip digital
filtering intended for the measurement of wide dynamic range,
low-frequency signals such as those in weigh-scale, strain-gage,
pressure transducer, or temperature measurement applications.
This ADC input is buffered and can be programmed to have an
input voltage range of
±
160 mV or
±
2.56 V. The input channels
are configured as two fully differential inputs. Buffering the input
channels means that the part can accommodate significant source
impedances on the analog inputs and that R, C filtering (for
noise rejection or RFI reduction) can be placed on the analog
inputs if required. The device requires an external reference of
+2.5 V nominal. Figure 3 shows the basic connections required
to operate the part.
AD7782
REFIN(+)
REFIN(
–
)
AIN1(
–
)
AIN1(+)
AIN2(
–
)
AIN2(+)
XTAL1
XTAL2
V
DD
DOUT/
RDY
CS
SCLK
GND
POWER
SUPPLY
10 F
0.1 F
CONTROLLER
32.768kHz
CRYSTAL
6k
10k
IN
–
OUT+
OUT
–
IN+
Figure 3. Basic Connection Diagram
The output rate of the AD7782 (
f
ADC
)
equals:
f
ADC
=
×
×
×
(
)
32 768
.
10
69
8
3
3
/
while the settling time equals:
t
f
t
SETTLE
ADC
ADC
=
=
×
2
2
Normal-mode rejection is the major function of the digital filter on
the AD7782. Simultaneous 50 Hz and 60 Hz rejection of better
than 60 dB is achieved as notches are placed at both 50 Hz and
60 Hz. Figure 4 shows the filter rejection.
FREQUENCY
–
Hz
0
0
10
40
60
80
100
A
–
–
40
–
80
–
120
–
140
–
160
–
20
–
60
–
100
20
30
50
70
90
OUTPUT DATA RATE = 19.8Hz
INPUT BANDWIDTH = 4.74Hz
50Hz REJECTION =
–
66dB, 50Hz 1Hz REJECTION =
–
60dB
60Hz REJECTION =
–
117dB, 60Hz 1Hz REJECTION =
–
94dB
Figure 4. Filter Profile (Filter Notches at
Both 50 Hz and 60 Hz)
2.5
0
1.0
3.0
2.5
2.0
1.5
3.5
5.0
4.5
4.0
2.0
1.5
1.0
0.5
3.0
V
REF
–
V
R
–
160mV RANGE
2.56V RANGE
V
DD
= 5V
V
REF
= 2.5V
T
A
TPC 2. RMS Noise vs. Reference Input
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| AD7782BRUZ | 功能描述:IC ADC 24BIT 2CHAN 16TSSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率（每秒）:45k 數據接口:串行 轉換器數目:2 功率耗散（最大）:315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端，單極 |
| AD7782BRUZ-REEL | 功能描述:IC ADC 24BIT 2CHAN 16TSSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率（每秒）:45k 數據接口:串行 轉換器數目:2 功率耗散（最大）:315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端，單極 |
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