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ADA4937-1YCPZ-R7 Datasheet(PDF) 20 Page - Analog Devices

Part # ADA4937-1YCPZ-R7
Description  Ultralow Distortion, Differential ADC Driver
PDF  28 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADA4937-1YCPZ-R7 Datasheet(HTML) 20 Page - Analog Devices

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ADA4937-1
Rev. 0 | Page 20 of 28
It is also possible to connect the VOCM input to a common-mode
level (CML) output of an ADC. However, care must be taken to
assure that the output has sufficient drive capability. The input
impedance of the VOCM pin is approximately 10 kΩ. If multiple
ADA4937-1 devices share one reference output, it is
recommended that a buffer be used.
Table 9 and Table 10 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 VOCM settings with single 5 V and 3.3 V supplies.
Note that some gain configurations at 3.3 V cause the input
common-mode voltage to exceed the specified range and should be
avoided. If larger gains are required, other alternatives should be
considered, such as an input common-mode offset, ac coupling,
or a bipolar power supply.
Table 9. Differential Ground-Referenced Input, DC-Coupled; See Figure 48
Common-Mode Swing at +IN, −IN (V)
+VS = 5 V
VOUT,dm = 2.0 V p-p
+VS = 3.3 V
VOUT,dm = 1.6 V p-p
Nominal
Gain (dB)
RF (Ω)
RG (Ω)
RIN,dm(Ω)
Differential
Output
Noise Density
(nV/√Hz)
Approximate
Large-Signal
Bandwidth (MHz)
+VS = 5 V/3.3 V
VOCM = 2.5 V
VOCM = 3.2 V
VOCM = 1.6 V
VOCM = 1.8 V
0
200
200
400
5.8
1500/1100
0.75 to 1.75
1.10 to 2.10
0.40 to 1.20
0.50 to 1.30
348
348
696
6.7
3
280
200
400
7.2
1500/1100
0.69 to 1.40
0.98 to 1.69
0.39 to 1.04
0.46 to 1.04
348
249
498
7.6
6
200
100
200
8.0
1400/1100
0.58 to 1.08
0.82 to 1.32
0.33 to 0.73
0.40 to 0.80
348
174
348
9.0
10
316
100
200
11
800/700
0.44 to 0.76
0.61 to 0.92
Out of range
0.31 to 0.56
348
110
220
12
12
402
100
200
14
500/500
0.37 to 0.62
0.51 to 0.76
Out of range
Out of range
348
86.6
173
13
14
499
100
200
17
300/300
0.32 to 0.52
0.43 to 0.63
Out of range
Out of range
348
69.8
140
16
Table 10. Single-Ended Ground-Referenced Input, DC-Coupled, RS = 50 Ω; See Figure 49
Common-Mode Swing at +IN, -IN (V)
+VS = 5 V
VOUT,dm = 2.0 V p-p
+VS = 3.3 V
VOUT,dm = 1.6 V p-p
Nominal
Gain (dB)
RF
(Ω)
RG1
(Ω)
RT
(Ω)
RIN,cm
(Ω)
RG2
(Ω)1
Differential
Output
Noise
Density
(nV/√Hz)
Approximate
Large-Signal
Bandwidth
(MHz)
+VS = 5 V/3.3 V
VOCM = 2.5 V
VOCM = 3.2 V
VOCM = 1.6 V
VOCM = 1.8 V
0
200
200
61.9
267
226
5.5
1500/1100
0.75 to 1.75
1.13 to 2.26
0.40 to 1.30
348
348
56.2
464
374
6.5
Out of range
3
280
200
60.4
282
226
6.8
1500/1100
0.71 to 1.52
1.03 to 1.83
0.39 to 1.04
0.48 to 1.13
348
249
59.0
351
274
7.3
6
200
100
75.0
150
130
7.0
1400/1100
0.66 to 1.31
0.94 to 1.59
0.37 to 0.89
0.45 to 0.97
348
174
61.9
261
200
8.4
10
316
100
73.2
161
130
9.7
800/700
0.52 to 0.93
0.73 to 1.14
0.30 to 0.63
0.36 to 0.69
348
110
69.8
177
140
10
12
402
100
71.5
167
130
12
500/500
0.45 to 0.77
0.62 to 0.94
Out of range
0.31 to 0.57
348
86.6
76.8
144
118
11
14
499
100
71.5
171
130
14
300/300
0.39 to 0.65
0.53 to 0.79
Out of range
Out of range
348
69.8
86.6
120
100
12
1 RG2 = RG1 + (RS||RT)



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