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參數(shù)資料
| 型號： | AD7984BCPZ-RL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/24頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT 1.33MSPS 10LFCSP |
| 設(shè)計資源： | Converting a Single-Ended Signal with AD7984 Differential PulSAR ADC (CN0033) |
| 標準包裝： | 1 |
| 系列： | PulSAR® |
| 位數(shù)： | 18 |
| 采樣率（每秒）： | 1.33M |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 14mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-WFDFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 10-LFCSP-WD（3x3） |
| 包裝： | 標準包裝 |
| 輸入數(shù)目和類型： | 1 個差分，單極 |
| 其它名稱： | AD7984BCPZ-RL7DKR |
AD7984
Rev. A | Page 15 of 24
SINGLE-TO-DIFFERENTIAL DRIVER
For applications using a single-ended analog signal, either
bipolar or unipolar, the ADA4941-x single-ended-to-
differential driver allows for a differential input into the part. The
schematic is shown in Figure 26.
R1 and R2 set the attenuation ratio between the input range and
the ADC range (VREF). R1, R2, and CF are 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.
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 close to VREF/2. 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.
15
15
10F
R1
100nF
+2.5V
+5V REF
+5.2V
–0.2V
CF
R2
R4
R6
±10V,
±5V, ..
R3
R5
REF
VDD
GND
IN+
IN–
AD7984
2.7nF
ADA4941
IN
FB
OUTP
OUTN
REF
100nF
0
6973-
01
6
Figure 26. Single-Ended-to-Differential Driver Circuit
VOLTAGE REFERENCE INPUT
The AD7984 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
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 a low temperature drift ADR43x reference.
If desired, a reference-decoupling capacitor with values as small
as 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.
POWER SUPPLY
The AD7984 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 5.5 V. To reduce the
number of supplies needed, VIO and VDD can be tied together.
The AD7984 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 27.
95
90
85
80
75
70
65
60
P
S
R
(
d
B)
1
10
100
1000
FREQUENCY (kHz)
0
69
73
-01
7
Figure 27. PSRR vs. Frequency
To ensure optimum performance, VDD should be roughly half
of REF, the voltage reference input. For example, if REF is 5.0 V,
VDD should be set to 2.5 V (±5%).
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