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參數(shù)資料
| 型號： | EVAL-AD7783EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Read-Only, Pin Configured 24-Bit ADC with Excitation Current Sources |
| 中文描述： | 只讀，引腳配置24位ADC的勵(lì)磁電流源 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 217K |
| 代理商： | EVAL-AD7783EB |
REV. B
Typical Performance Characteristics–AD7783
–7–
8
7
0
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
6
5
4
3
2
1
9
TPC 1. Noise Distribution Histogram
ADC CIRCUIT INFORMATION
Overview
The AD7783 incorporates a
S
-
D
ADC channel, on-chip pro-
grammable 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 trans-
ducer, 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 channel
is configured as a fully differential input. Buffering the input
channel means that the part can accommodate significant source
impedances on the analog input and that R, C filtering (for
noise rejection or RFI reduction) can be placed on the analog
input if required. The device requires an external reference of
2.5 V nominal. Figure 3 shows the basic connections required
to operate the part.
AD7783
REFIN(+)
REFIN(–)
AIN(–)
AIN(+)
IOUT2
IOUT1
XTAL1
XTAL2
V
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 AD7783 (
f
ADC
)
equals
f
ADC
=
￥
￥
￥
(
)
32 768
.
10
69
8
3
3
/
while the settling time equals
t
f
t
SETTLE
ADC
ADC
=ê
ˉ=
￥
2
2
Normal-mode rejection is the major function of the digital filter
on the AD7783. 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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