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| 型号： | AD7984BCPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT 1.33MSPS 10LFCSP |
| 设计资源： | Converting a Single-Ended Signal with AD7984 Differential PulSAR ADC (CN0033) |
| 标准包装： | 5,000 |
| 系列： | PulSAR® |
| 位数： | 18 |
| 采样率（每秒）： | 1.33M |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 14mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘，CSP |
| 供应商设备封装： | 10-LFCSP-WD（3x3） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，单极 |
AD7984
Rev. A | Page 14 of 24
ANALOG INPUTS
Figure 24 shows an equivalent circuit of the input structure of
the AD7984.
The two diodes, D1 and D2, provide ESD protection for the
analog inputs, IN+ and IN. Care must be taken to ensure that
the analog input signal does not exceed the reference input
voltage (REF) by more than 0.3 V. If the analog input signal
exceeds this level, the diodes become forward-biased and start
conducting current. These diodes can handle a forward-biased
current of 130 mA maximum. However, if the supplies of the
input buffer (for example, the supplies of the ADA4841 in
Figure 23) are different from those of REF, the analog input
signal may eventually exceed the supply rails by more than
0.3 V. In such a case (for example, an input buffer with a short-
circuit), the current limitation can be used to protect the part.
CPIN
REF
RIN
CIN
D1
D2
IN+ OR IN–
GND
06
97
3-
0
1
4
Figure 24. Equivalent Analog Input Circuit
The analog input structure allows the sampling of the true
differential signal between IN+ and IN. By using these
differential inputs, signals common to both inputs are rejected.
90
85
80
75
70
65
60
1
10
100
1000
10000
FREQUENCY (kHz)
CM
RR
(
d
B
)
0
69
73
-01
5
Figure 25. Analog Input CMRR vs. Frequency
During the acquisition phase, the impedance of the analog
inputs (IN+ or IN) can be modeled as a parallel combination
of capacitor, CPIN, and the network formed by the series connection
of RIN and CIN. CPIN is primarily the pin capacitance. RIN is typically
400 Ω and is a lumped component composed of serial resistors
and the on resistance of the switches. CIN is typically 30 pF and
is mainly the ADC sampling capacitor.
During the sampling phase, where the switches are closed, the
input impedance is limited to CPIN. RIN and CIN make a 1-pole,
low-pass filter that reduces undesirable aliasing effects and
limits noise.
When the source impedance of the driving circuit is low, the
AD7984 can be driven directly. Large source impedances
significantly affect the ac performance, especially THD. The
dc performances are less sensitive to the input impedance. The
maximum source impedance depends on the amount of THD
that can be tolerated. The THD degrades as a function of the
source impedance and the maximum input frequency.
DRIVER AMPLIFIER CHOICE
Although the AD7984 is easy to drive, the driver amplifier must
meet the following requirements:
The noise generated by the driver amplifier must be kept as
low as possible to preserve the SNR and transition noise
performance of the AD7984. The noise from the driver is
filtered by the AD7984 analog input circuit’s 1-pole, low-
pass filter made by RIN and CIN or by the external filter, if
one is used. Because the typical noise of the AD7984 is
36.24 μV rms, the SNR degradation due to the amplifier is
+
=
2
)
(
2
π
.24
6
3
36.24
log
20
N
3dB
LOSS
Ne
f
SNR
where:
f–3dB is the input bandwidth, in megahertz, of the AD7984
(10 MHz) or the cutoff frequency of the input filter, if
one is used.
N is the noise gain of the amplifier (for example, 1 in buffer
configuration).
eN is the equivalent input noise voltage of the op amp, in
nV/√Hz.
For ac applications, the driver should have a THD perfor-
mance commensurate with the AD7984.
For multichannel multiplexed applications, the driver
amplifier and the AD7984 analog input circuit must settle
for a full-scale step onto the capacitor array at an 18-bit level
(0.0004%, 4 ppm). In the data sheet of the amplifier,
settling at 0.1% to 0.01% is more commonly specified. This
may differ significantly from the settling time at an 18-bit
level and should be verified prior to driver selection.
Table 8. Recommended Driver Amplifiers
Amplifier
Typical Application
Very low noise, low power single-to-differential
Very low noise, small, and low power
Very low noise and high frequency
Low noise and high frequency
Low power, low noise, and low frequency
5 V single supply, low noise
5 V single supply, low power
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