ada4938-1xcpz Analog Devices, Inc., ada4938-1xcpz Datasheet - Page 12

• Manufacturer Part Number: ada4938-1xcpz
• Description: Ultra-low Distortion Differential Adc Driver
• Manufacturer: Analog Devices, Inc.

ADA4938-1
assure that the output has sufficient drive capability. The input
impedance of the V
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
Table 7. Differential Ground-Referenced Input, DC-Coupled; See Figure 6
Nominal
Gain (dB)
0
3
6
10
12
14
Table 8. Single-Ended Ground-Referenced Input, DC-Coupled, R
Nominal
Gain (dB)
0
3
6
10
12
14
1
R
G2
= R
G1
+ (R
OCM
S
||R
R
(Ω)
200
348
280
348
200
348
316
348
402
348
499
348
R
200
348
280
348
200
348
316
348
402
348
499
348
F
F
T
settings with both dual and single 5 V supplies.
)
(Ω)
R
(Ω)
200
348
200
249
100
174
100
110
100
86.6
100
69.8
OCM
G1
R
200
348
200
249
100
174
100
110
100
86.6
100
69.8
G
pin is approximately 10 kΩ. If multiple
(Ω)
R
(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
T
R
400
696
400
498
200
348
200
220
200
173
200
140
IN, dm
R
(Ω)
267
464
282
351
150
261
161
177
167
144
171
120
IN,cm
(Ω)
R
(Ω)
226
374
226
274
130
200
130
140
130
118
130
100
Differential
Output
Noise Density
(nV/√Hz)
5.8
6.7
7.2
7.6
8.0
9.0
11
12
14
13
17
16
G2
1
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)
Rev. PrD | Page 12 of 14
Approximate
Large-Signal
Bandwidth
(MHz)
S
= 50 Ω; See Figure 7
V
-0.50 to 0.50
-0.35 to 0.35
-0.25 to 0.25
-0.16 to 0.16
-0.13 to 0.13
-0.10 to 0.10
V
-0.56 to 0.56
-0.40 to 0.40
-0.33 to 0.33
-0.21 to 0.21
-0.16 to 0.16
-0.13 to 0.13
OCM
OCM
+V
V
+V
= 0 V
V
= 0 V
OUT, dm
OUT,dm
S
S
= 5 V, -V
= 5 V, -V
Common-Mode Swing at +IN, −IN (V)
Common-Mode Swing at +IN, -IN (V)
= 2.0 V p-p
= 2.0 V p-p
Preliminary Technical Data
V
1.25 to 2.25
1.10 to 1.82
0.92 to 1.42
0.68 to 1.00
0.57 to 0.82
0.48 to 0.68
V
1.29 to 2.42
1.16 to 1.97
1.05 to 1.70
0.82 to 1.23
0.70 to 1.02
0.59 to 0.85
S
OCM
S
OCM
= -5 V
= -5 V
= 3.5 V
= 3.5 V
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
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
OCM
OCM
V
= 2.5 V
V
= 2.5 V
OUT, dm
OUT, dm
+V
+V
= 2.0 V p-p
= 2.0 V p-p
S
S
=5 V
=5 V
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
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
OCM
OCM
= 3.2 V
= 3.2 V