AD8331ARQZ-R7 datasheet(29/56 Pages) AD

tên linh kiện	AD8331ARQZ-R7

Giải thích chi tiết về linh kiện	Ultralow Noise VGAs with Preamplifier and Programmable RIN

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AD8331/AD8332/AD8334

Rev. G | Page 29 of 56

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

–3

–2

–1

VINH (V)

RCLMP = ∞

8.8kΩ

3.5kΩ

RCLMP = 1.86kΩ

Output Clamping

Outputs are internally limited to a level of 4.5 V p-p differential

when operating at a 2.5 V common-mode voltage. The postamp

implements an optional output clamp engaged through a resistor

from RCLMP to ground. Table 8 shows a list of recommended

resistor values.

Output clamping can be used for ADC input overload protection, if

needed, or postamp overload protection when operating from a

lower common-mode level, such as 1.5 V. The user should be

aware that distortion products increase as output levels approach

the clamping levels, and the user should adjust the clamp resistor

accordingly. For additional information, see the Applications

Information section.

The accuracy of the clamping levels is approximately ±5% in LO

or HI mode. Figure 80 illustrates the output characteristics for a

few values of RCLMP.

Figure 80. Output Clamping Characteristics

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