ADA4938-1ACPZ-R2 datasheet(12/14 Pages) AD

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ADA4938-1

Preliminary Technical Data

Rev. PrD | Page 12 of 14

assure that the output has sufficient drive capability. The input

impedance of the VOCM 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 VOCM settings with both dual and single 5 V supplies.

Table 7. Differential Ground-Referenced Input, DC-Coupled; See Figure 6

Common-Mode Swing at +IN, −IN (V)

+VS = 5 V, -VS = -5 V

VOUT,dm = 2.0 V p-p

+VS =5 V

VOUT,dm = 2.0 V p-p

Nominal

Gain (dB)

RF (Ω)

RG (Ω)

RIN,dm(Ω)

Differential

Output

Noise Density

(nV/√Hz)

Approximate

Large-Signal

Bandwidth (MHz)

VOCM = 0 V

VOCM = 3.5 V

VOCM = 2.5 V

VOCM = 3.2 V

200

400

5.8

-0.50 to 0.50

1.25 to 2.25

0.75 to 1.75

1.10 to 2.10

348

696

6.7

280

200

400

7.2

-0.35 to 0.35

1.10 to 1.82

0.69 to 1.40

0.98 to 1.69

348

249

498

7.6

200

100

200

8.0

-0.25 to 0.25

0.92 to 1.42

0.58 to 1.08

0.82 to 1.32

348

174

348

9.0

316

100

200

-0.16 to 0.16

0.68 to 1.00

0.44 to 0.76

0.61 to 0.92

348

110

220

402

100

200

-0.13 to 0.13

0.57 to 0.82

0.37 to 0.62

0.51 to 0.76

348

86.6

173

499

100

200

-0.10 to 0.10

0.48 to 0.68

0.32 to 0.52

0.43 to 0.63

348

69.8

140

Table 8. Single-Ended Ground-Referenced Input, DC-Coupled, RS = 50 Ω; See Figure 7

Common-Mode Swing at +IN, -IN (V)

+VS = 5 V, -VS = -5 V

VOUT,dm = 2.0 V p-p

+VS =5 V

VOUT,dm = 2.0 V p-p

Nominal

Gain (dB)

(Ω)

RG1

(Ω)

RIN,cm

(Ω)

RG2

(Ω)1

Differential

Output

Noise

Density

(nV/√Hz)

Approximate

Large-Signal

Bandwidth

(MHz)

VOCM = 0 V

VOCM = 3.5 V

VOCM = 2.5 V

VOCM = 3.2 V

200

61.9

267

226

5.5

-0.56 to 0.56

1.29 to 2.42

0.75 to 1.75

1.13 to 2.26

348

56.2

464

374

6.5

280

200

60.4

282

226

6.8

-0.40 to 0.40

1.16 to 1.97

0.71 to 1.52

1.03 to 1.83

348

249

59.0

351

274

7.3

200

100

75.0

150

130

7.0

-0.33 to 0.33

1.05 to 1.70

0.66 to 1.31

0.94 to 1.59

348

174

61.9

261

200

8.4

316

100

73.2

161

130

9.7

-0.21 to 0.21

0.82 to 1.23

0.52 to 0.93

0.73 to 1.14

348

110

69.8

177

140

402

100

71.5

167

130

-0.16 to 0.16

0.70 to 1.02

0.45 to 0.77

0.62 to 0.94

348

86.6

76.8

144

118

499

100

71.5

171

130

-0.13 to 0.13

0.59 to 0.85

0.39 to 0.65

0.53 to 0.79

348

69.8

86.6

120

100

1 RG2 = RG1 + (RS||RT)

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