AD9278BBCZ datasheet(4/45 Pages) AD

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Data Sheet

AD9278

Rev. A | Page 3 of 44

SPECIFICATIONS

AC SPECIFICATIONS

AVDD1 = 1.8 V, AVDD2 = 3.0 V, DRVDD = 1.8 V, 1.0 V internal ADC reference, full temperature range (−40°C to +85°C), fIN = 5 MHz,

RS = 50 Ω, RFB = ∞ (unterminated), LNA gain = 21.3 dB, LNA bias = default, PGA gain = 24 dB, GAIN− = 0.8 V, GAIN+ = 0 V, AAF LPF

cutoff = fSAMPLE/3 (MODE I/II/III), AAF LPF cutoff = fSAMPLE/4.5 (MODE IV), HPF cutoff = LPF cutoff/12, MODE I = fSAMPLE = 40 MSPS,

MODE II = fSAMPLE = 25 MSPS, MODE III = fSAMPLE = 50 MSPS, MODE IV = fSAMPLE = 65 MSPS, low power LVDS mode, unless otherwise

noted.

Table 1.

Parameter1

Test Conditions/Comments

Min

Typ

Max

Unit

LNA CHARACTERISTICS

Gain

Single-ended input to differential

output

15.6/17.9/21.3

Single-ended input to single-ended

output

9.6/11.9/15.3

0.1 dB Input Compression Point

LNA gain = 15.6 dB

1.00

V p-p

LNA gain = 17.9 dB

0.75

V p-p

LNA gain = 21.3 dB

0.45

V p-p

1 dB Input Compression Point

LNA gain = 15.6 dB

1.20

V p-p

LNA gain = 17.9 dB

0.90

V p-p

LNA gain = 21.3 dB

0.60

V p-p

Input Common Mode (LI-x, LG-x)

2.2

Output Common Mode (LO-x)

Output Common Mode (LOSW-x)

Switch off

High-Z

Switch on

1.5

Input Resistance (LI-x)

RFB = 350 Ω, LNA gain = 21.3 dB

RFB = 1400 Ω, LNA gain = 21.3 dB

200

RFB = ∞, LNA gain = 21.3 dB

kΩ

Input Capacitance (LI-x)

−3 dB Bandwidth

LNA gain = 15.6 dB

100

MHz

LNA gain = 17.9 dB

MHz

LNA gain = 21.3 dB

MHz

Input Noise Voltage

RS = 0 Ω, RFB = ∞

LNA gain = 15.6 dB

1.60

nV/√Hz

LNA gain = 17.9 dB

1.42

nV/√Hz

LNA gain = 21.3 dB

1.27

nV/√Hz

Input Noise Current

RFB = ∞

1.5

pA/√Hz

Noise Figure

RS = 50 Ω

Active Termination Matched

LNA gain = 15.6 dB, RFB = 200 Ω

7.8

LNA gain = 17.9 dB, RFB = 250 Ω

6.7

LNA gain = 21.3 dB, RFB = 350 Ω

5.6

Unterminated

LNA gain = 15.6 dB, RFB = ∞

6.1

LNA gain = 17.9 dB, RFB = ∞

5.3

LNA gain = 21.3 dB, RFB = ∞

4.7

FULL-CHANNEL (TGC)

CHARACTERISTICS

AAF Low-Pass Cutoff

−3 dB, programmable

MHz

In Range AAF Bandwidth

Tolerance

±10

Group Delay Variation

f = 1 MHz to 18 MHz, GAIN+ = 0 V to 1.6 V

±0.3

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