ADA4850-1/ADA4850-2

Rev. B | Page 13 of 16

OPERATING THE ADA4850-1/ADA4850-2 ON

BIPOLAR SUPPLIES

Figure 40 shows the output recovery transients for the amplifier

recovering from a saturated output from the top and bottom

supplies to a point at midsupply.

The ADA4850-1/ADA4850-2 can operate on bipolar supplies

and the POWER DOWN pin must not exceed 6 V. Voltage

differences greater than 6 V can cause permanent damage to the

amplifier. For example, when operating on ±5 V supplies, the

POWER DOWN pin must not exceed +1 V.

6.5

–1.5

0

100

TIME (ns)

5.5

4.5

3.5

2.5

1.5

0.5

–0.5

10

20

30

40

50

60

70

80

90

G = –1

INPUT

VOLTAGE

EDGES

POWER-DOWN PINS

The ADA4850-1/ADA4850-2 feature an ultralow power-down

mode that lowers the supply current to less than 150 nA. When

a power-down pin is brought to within 0.6 V of the negative

supply, the amplifier is powered down. Table 5 outlines the

power-down pins functionality. To ensure proper operation, the

power-down pins (PD1, PD2) should not be left floating.

Table 5. Power-Down Pins Functionality

Figure 40. Overload Recovery

3 V and 5 V

Supply Voltage

ADA4850-1

ADA4850-2

Power Down

0 V to 0.7 V

0 V to 0.6 V

Enabled