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Data Sheet

AD8152

Rev. B | Page 23 of 25

Table 15. Power Consumption

Parameter

Input Termination

Resistors

Input

Stage

Core

Output

Predriver

Output Termination

Resistors

Output

Switch +

Current

Source

Total

Power

Quiescent Current

N/A

32 mA

N/A

Current per Active

Channel

VIN/(RTERMINATION)

2 mA

N/A

0.25 × IOUT

0.5 × IOUT

IOUT

N/A

Current per Active

Channel for Differential

N/A

VIN = 800 mV p-p Sine

566 mV rms/100

N/A

VOUT = 800 mV p-p

= 5.66 mA

2 mA

4 mA

8 mA

16 mA

N/A

2.5 V Operation (VCC – VEE = 2.5 V, VTTO = 2.5 V, IOUT = 16 mA)

Per Channel Power

3.2 mW

5 mW

10 mW

8 mW

33.6 mW

N/A

Power for All Channels

Active

108.8 mW

170 mW

80 mW

340 mW

272 mW

1.03 W

2.0 W

Percentage of Total Power

17%

13.6%

51%

N/A

3.3 V Operation (VCC – VEE = 3.3 V, VTTO = 3.3 V, IOUT = 16 mA)

Per Channel Power

3.2 mW

6.6 mW

13.2 mW

8 mW

46.4 mW

N/A

Power for All Channels

Active

108.8 mW

224 mW

106 mW

449 mW

272 mW

1.47 W

2.63 W

Percentage of Total Power

17%

10%

56%

N/A

Input Termination Resistors

The power dissipated in the input termination resistors is

delivered by the driving source. First, assume the driving

waveform for an individual input is a differential square wave

with an amplitude of VINPP. Then the power dissipated in this

input is (VINPP)2/2RTERM, where RTERM is the termination resistor.

If dc coupling is used, a dc current flows from VTTI through

the termination resistors if the dc voltage of the drive circuit is

not equal to VTTI. The additional power in each input termination

resistor is the current multiplied by the 50 Ω value of the input

terminations.

For a point of reference, assume a channel has a sinusoidal

input of 800 mV p-p differential. The power dissipated for a

single input is 3.2 mW. If all 34 input channels are driven the same,

the power in the input terminations is 109 mW.

Input Stage

The input stages are powered down when not in use.

Approximately 2 mA flows through an enabled input from VCC

to VEE. Thus, the power dissipated by an enabled input is 5

mW for a supply of 2.5 V and 6.6 mW for a 3.3 V supply. When

all 34 inputs are enabled, the total power consumed in the input

stage is approximately 170 mW (VCC = 2.5 V) and 224 mW

(VCC = 3.3 V).

Switch Matrix

The switch matrix draws a fixed 32 mA when the AD8152 is

powered. This current flows from VCC to VEE. The power

dissipation from this current is 80 mW at 2.5 V and 106 mW at

3.3 V.

Output Predrivers

The output predrivers draw additional current when each

output is enabled. This extra current is proportional to the

programmed output current. The extra predriver current for a

channel is 25% of the programmed output current for that

channel. This current also flows from VCC to VEE.

When an output is enabled and programmed to 16 mA, an

additional 4 mA flows in the predriver section. This predriver

current dissipates either 10 mW at 2.5 V or 13.2 mW at 3.3 V

for an individual output.

For all enabled 34 outputs and programmed to 16 mA, the

predriver power is 340 mW at 2.5 V or 449 mW at 3.3 V.

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