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| 型号： | ADA4941-1YRZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/25页 |
| 文件大小： | 0K |
| 描述： | IC DIFF ADC DRIVER 18BIT 8SOIC |
| 设计资源： | Converting a Single-Ended Signal with AD7982 Differential PulSAR ADC (CN0032) Converting a Single-Ended Signal with AD7984 Differential PulSAR ADC (CN0033) |
| 标准包装： | 1,000 |
| 类型： | ADC 驱动器 |
| 应用： | 数据采集 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
ADA4941-1
Rev. C | Page 17 of 24
Table 7, Table 8, and Table 9 show typical error budgets for the
circuits shown in Figure 48, Figure 49, and Figure 50.
RF = 1.0 k, RG = 4.99 k, RS_IN = 825 , RS_REF = 0
Table 7. Output Voltage Error Budget for G = 2.4 Amplifier
Shown in Figure 48
Error
Source
Typical
Value
VOP_error
VON_error
VO_dm_error
VOS_A1
0.1 mV
+0.12 mV
0.12 mV
+0.24 mV
IBP_A1
3 A
+2.48 mV
2.48 mV
4.96 mV
IBN_A1
3 A
2.48 mV
+2.48 mV
+4.96 mV
VOS_A2
0.1 mV
0 mV
+0.2 mV
Total VO_error, dm = 0.44 mV
RF = 0 , RG = ∞, RS_IN = 0 , RS_REF = 0
Table 8. Output Voltage Error Budget for Amplifier Shown
Error
Source
Typical
Value
VOP_error
VON_error
VO_dm_error
VOS_A1
0.1 mV
+0.1 mV
0.1 mV
+0.2 mV
IBP_A1
3 A
+2.48 mV
2.48 mV
4.96 mV
IBN_A1
3 A
2.48 mV
+2.48 mV
+4.96 mV
VOS_A2
0.1 mV
0 mV
+0.2 mV
Total VO_error, dm = 0.4 mV
RF = 1.02 k, RG = 665 , RS_IN = 402 , RS_REF = 0
Table 9. Output Voltage Error Budget for G = 5 Amplifier
Shown in Figure 50
Error
Source
Typical
Value
VOP_error
VON_error
VO_dm_error
VOS_A1
0.1 mV
+0.25 mV
0.25 mV
+0.5 mV
IBP_A1
3 A
+1.21 mV
1.21 mV
2.4 mV
IBN_A1
3 A
1.21 mV
+1.21 mV
+2.4 mV
VOS_A2
0.1 mV
0 mV
+0.2 mV
Total VO_error, dm = 0.7 mV
OUTPUT VOLTAGE NOISE
1k
1k
RG
RF
RS
ip–A2
in–A2
vn–A1
500
A2
A1
REF
IN
2
8
4
5
FB
OUT+
+
–
VOP
1
OUT–
+
–
VON
vn–A2
RS–REF
ip–A1
in–A1
05704-
057
√4kT (1k)
√4kT (500)
√4kT (RS–REF)
√4kTRS
√4kTRG
√4kTRF
Figure 52. Noise Sources
Figure 52 shows the major contributors to the ADA4941-1
differential output voltage noise. The differential output noise
mean-square voltage equals the sum of twice the noise mean-
square voltage contributions from the noninverting channel
(A1), plus the noise mean-square voltage terms associated with
the inverting channel (A2).
[
]
[
]
2
_
4
1
2
4
2
4
2
_
2
)
_
(
1
2
)
_
(
1
2
_
,
n
VON
kTR
R
kTR
R
A1
in
R
A1
ip
R
A1
vn
R
n
dm
V
S
G
F
G
F
G
F
S
G
F
G
F
O
+
×
+
×
+
×
+
×
+
×
+
×
+
×
+
=
(13)
where VON_n2 is calculated as
(
)
[
] [
]
)
(
16
(500)
16
(1000)
8
)
_
(
1000
)
_
500
)(
_
(
4
2
_REF
R
kT
A2
in
REF
R
A2
ip
vn_A2
VON_n
S
+
=
(14)
where:
vn_A1 and vn_A2 are the input voltage noises of A1 and A2,
each equal to 2.1 nV/√Hz.
in_A1, in_A2, ip_A1, and ip_A2 are amplifier input current
noise terms, each equal to 1 pA/√Hz.
RS, RF, and RG are the external source, feedback, and gain
resistors, respectively.
kT is Boltzmann’s constant times absolute temperature, equal to
4.2 x 10-21 W-s at room temperature.
RS_REF is any source resistance at the REF pin.
When A1 is used as a unity gain follower, the output voltage
noise spectral density is at its minimum, 10 nV/√Hz. Higher
voltage gains have higher output voltage noise.
Table 10, Table 11, and Table 12 show the noise contributions
and output voltage noise for the circuits in Figure 48, Figure 49,
and Figure 50.
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