Data Sheet

AD8285

Rev. B | Page 3 of 27

SPECIFICATIONS

AC SPECIFICATIONS

AVDD18 = AVDD18ADC = 1.8 V, AVDD33 = AVDD33x1 = AVDD33REF = 3.3 V, DVDD18 = DVDD18CLK = 1.8 V, DVDD33SPI =

Table 2.

Parameter2

Test Conditions/Comments

Min

Typ

Max

Unit

ANALOG CHANNEL CHARACTERISTICS

LNA, PGA, and AAF channels

Gain

16/22/28/34

dB

Gain Range

18

dB

Gain Error

−1.25

+1.25

dB

Input Voltage Range

Channel gain = 16 dB

0.25

V p-p

Channel gain = 22 dB

0.125

V p-p

Channel gain = 28 dB

0.0625

V p-p

Channel gain = 34 dB

0.03125

V p-p

Input Resistance

200 Ω input impedance selected

0.180

0.230

0.280

kΩ

200 kΩ input impedance selected

160

200

240

kΩ

Input Capacitance

22

pF

Input Referred Voltage Noise

Maximum gain at 1 MHz

1.85

nV/√Hz

Minimum gain at 1 MHz

6.03

nV/√Hz

Noise Figure

7.1

dB

12.7

dB

Output Offset

Gain = 16 dB

−60

+60

LSB

Gain = 34 dB

−250

+250

LSB

AAF Low-Pass Filter Cutoff

−3 dB, programmable

1.0 to 12.0

MHz

Tolerance

After filter autotune

−10

±5

+10

%

AAF Attenuation in Stop Band

Third-order elliptic filter

2× cutoff

30

dB

3× cutoff

40

dB

Group Delay Variation

Filter set at 2 MHz

400

ns

Channel-to-Channel Phase Variation

Frequencies up to −3 dB

−5

±0.5

+5

Degrees

¼ of −3 dB frequency

−1

+1

Degrees

Channel-to-Channel Gain Matching

Frequencies up to −3 dB

−0.5

±0.1

+0.5

dB

¼ of −3 dB frequency

−0.25

+0.25

dB

1 dB Compression

Relative to output

9.8

dBm

Crosstalk

−70

−55

dBc

POWER SUPPLY

AVDD18, AVDD18ADC

1.7

1.8

1.9

V

AVDD33, AVDD33x1, AVDD33REF

3.1

3.3

3.5

V

DVDD18, DVDD18CLK

1.7

1.8

1.9

V

DVDD33SPI, DVDD33CLK,

DVDD33DRV

3.1

3.3

3.5

V

Full channel mode

130

mA

Full channel mode

130

mA

22

mA

2

mA

Total Power Dissipation Per Channel

Full channel mode, no signal, typical supply

voltage × maximum supply current; excludes

output current

185

mW

Power-Down Dissipation

5

mW

Power Supply Rejection Ratio (PSRR)

1.6

mV/V