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參數資料
| 型號： | ADA4938-1_07 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Ultra-Low Distortion Differential ADC Driver |
| 中文描述： | 超低失真差分ADC驅動器 |
| 文件頁數： | 12/14頁 |
| 文件大小： | 307K |
| 代理商： | ADA4938-1_07 |
ADA4938-1
Preliminary Technical Data
assure that the output has sufficient drive capability. The input
impedance of the V
OCM
pin is approximately 10 kΩ. If multiple
ADA4938-1 devices share one reference output, it is
recommended that a buffer be used.
Table 7 and Table 8 list several common gain settings,
associated resistor values, input impedance, output noise
density, and approximate large signal bandwidth for both balanced
and unbalanced input configurations. Also shown are the input
common-mode voltage swings under the given conditions for
different V
OCM
settings with both dual and single 5 V supplies.
Rev. PrD | Page 12 of 14
Table 7. Differential Ground-Referenced Input, DC-Coupled; See Figure 6
Common-Mode Swing at +IN, IN (V)
+V
S
= 5 V, -V
S
= -5 V
V
OUT, dm
= 2.0 V p-p
V
OCM
= 0 V
V
OCM
= 3.5 V
-0.50 to 0.50
1.25 to 2.25
-0.35 to 0.35
1.10 to 1.82
-0.25 to 0.25
0.92 to 1.42
-0.16 to 0.16
0.68 to 1.00
-0.13 to 0.13
0.57 to 0.82
-0.10 to 0.10
0.48 to 0.68
+V
S
=5 V
V
OUT, dm
= 2.0 V p-p
V
OCM
= 2.5 V
0.75 to 1.75
0.69 to 1.40
0.58 to 1.08
0.44 to 0.76
0.37 to 0.62
0.32 to 0.52
Nominal
Gain (dB)
0
3
6
10
12
14
R
F
(Ω)
200
348
280
348
200
348
316
348
402
348
499
348
R
G
(Ω)
200
348
200
249
100
174
100
110
100
86.6
100
69.8
R
IN, dm
(Ω)
400
696
400
498
200
348
200
220
200
173
200
140
Differential
Output
Noise Density
(nV/√Hz)
5.8
6.7
7.2
7.6
8.0
9.0
11
12
14
13
17
16
Approximate
Large-Signal
Bandwidth (MHz)
V
OCM
= 3.2 V
1.10 to 2.10
0.98 to 1.69
0.82 to 1.32
0.61 to 0.92
0.51 to 0.76
0.43 to 0.63
Table 8. Single-Ended Ground-Referenced Input, DC-Coupled, R
S
= 50 Ω; See Figure 7
Common-Mode Swing at +IN, -IN (V)
+V
S
= 5 V, -V
S
= -5 V
V
OUT,dm
= 2.0 V p-p
V
OCM
= 0 V
V
OCM
= 3.5 V
-0.56 to 0.56
1.29 to 2.42
-0.40 to 0.40
1.16 to 1.97
-0.33 to 0.33
1.05 to 1.70
-0.21 to 0.21
0.82 to 1.23
-0.16 to 0.16
0.70 to 1.02
-0.13 to 0.13
0.59 to 0.85
+V
S
=5 V
V
OUT, dm
= 2.0 V p-p
V
OCM
= 2.5 V
0.75 to 1.75
0.71 to 1.52
0.66 to 1.31
0.52 to 0.93
0.45 to 0.77
0.39 to 0.65
Nominal
Gain (dB)
0
3
6
10
12
14
1
R
G2
= R
G1
+ (R
S
||R
T
)
R
F
(Ω)
200
348
280
348
200
348
316
348
402
348
499
348
R
G1
(Ω)
200
348
200
249
100
174
100
110
100
86.6
100
69.8
R
T
(Ω)
61.9
56.2
60.4
59.0
75.0
61.9
73.2
69.8
71.5
76.8
71.5
86.6
R
IN,cm
(Ω)
267
464
282
351
150
261
161
177
167
144
171
120
R
G2
(Ω)
1
226
374
226
274
130
200
130
140
130
118
130
100
Differential
Output
Noise
Density
(nV/√Hz)
5.5
6.5
6.8
7.3
7.0
8.4
9.7
10
12
11
14
12
Approximate
Large-Signal
Bandwidth
(MHz)
V
OCM
= 3.2 V
1.13 to 2.26
1.03 to 1.83
0.94 to 1.59
0.73 to 1.14
0.62 to 0.94
0.53 to 0.79
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