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參數資料
| 型號： | ADA4941-1 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit, +/-0.65 LSB INL, 500 kSPS PulSAR Differential ADC in MSOP/QFN |
| 中文描述： | 16位/ -0.65 LSB INL和500 kSPS的PulSAR系列差分ADC，采用MSOP / QFN封裝 |
| 文件頁數： | 15/24頁 |
| 文件大?。?/td> | 449K |
| 代理商： | ADA4941-1 |
Preliminary Technical Data
AD7693
SINGLE-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 29.
Rev. PrB | Page 15 of 24
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.
R1 and R2 set the attenuation ratio between the input range and
the ADC range (V
REF
). R1, R2, and C
F
will be 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.
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 V
DD
. 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 30.
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 V
REF
/2; however, if single
supply is desired, it can be set slightly above V
REF
/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.
90
40
1
10000
FREQUENCY (kHz)
C
-
10
100
1000
85
80
75
70
65
60
55
50
45
V
REF
= VDD = 5V
AD7693
REF
GND
VDD
IN+
2.7nF
100nF
2.7nF
IN–
+5V REF
±10V,±5V, ...
+5.2V
+5.2V
15
Ω
10μF
R2
C
F
ADA4941
R1
R3
100nF
R5
R4
R6
-
15
Ω
Figure 30. PSRR vs. Frequency
The AD7693 powers down automatically at the end of each
conversion phase and, therefore, the power scales linearly with
the sampling rate. This makes the part ideal for low sampling
rate (even a few hertz) and low battery-powered applications.
Figure 29. 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.
1000
10
0.1
0.001
10
1M
SAMPLING RATE (SPS)
O
-
100
1k
100k
10k
VDD = 5V
VIO
10000
100
1
0.01
When REF is driven by a very low impedance source, for
example, a reference buffer using the
AD8031
or the
AD8605
, 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
performance using low temperature drift
ADR43x
and
ADR44x
references.
Figure 31. Operating Currents vs. Sample Rate
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