AD9276 datasheet(4/48 Pages) AD

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AD9276

Rev. 0 | Page 4 of 48

SPECIFICATIONS

AC SPECIFICATIONS

AVDD1 = 1.8 V, AVDD2 = 3.0 V, DRVDD = 1.8 V, 1.0 V internal ADC reference, fIN = 5 MHz, RS = 50 Ω, LNA gain = 21.3 dB, LNA bias = high,

PGA gain = 27 dB, GAIN− = 0.8 V, AAF LPF cutoff = fSAMPLE/3 (Mode I/Mode II), fSAMPLE/4.5 (Mode III), HPF cutoff = LPF cutoff/20.7 (default),

Mode I = fSAMPLE = 40 MSPS, Mode II = fSAMPLE = 65 MSPS, Mode III = fSAMPLE = 80 MSPS, full temperature, ANSI-644 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

Input Voltage Range

(Single-Ended)

LNA output limited to 4.4 V p-p differential

output

LNA gain = 15.6 dB

733

mV p-p

LNA gain = 17.9 dB

550

mV p-p

LNA gain = 21.3 dB

367

mV p-p

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

1.0

Output Common Mode (LO-x)

1.5

Output Common Mode (LOSW-x)

Switch off

High-Z

Switch on

1.5

Input Resistance (LI-x)

RFB = 250 Ω

RFB = 500 Ω

100

RFB = ∞

kΩ

Input Capacitance (LI-x)

−3 dB Bandwidth

100

MHz

Input Noise Voltage

RS = 0 Ω, RFB = ∞

LNA gain = 15.6 dB

0.98

nV/√Hz

LNA gain = 17.9 dB

0.86

nV/√Hz

LNA gain = 21.3 dB

0.75

nV/√Hz

Input Noise Current

RFB = ∞

pA/√Hz

1 dB Input Compression Point

GAIN+ = 0 V

LNA gain = 15.6 dB

1.0

V p-p

LNA gain = 17.9 dB

0.8

V p-p

LNA gain = 21.3 dB

0.5

V p-p

Noise Figure

RS = 50 Ω

Active Termination Matched

LNA gain = 15.6 dB, RFB = 200 Ω

4.8

LNA gain = 17.9 dB, RFB = 250 Ω

4.1

LNA gain = 21.3 dB, RFB = 350 Ω

3.2

Unterminated

LNA gain = 15.6 dB, RFB = ∞

3.4

LNA gain = 17.9 dB, RFB = ∞

2.8

LNA gain = 21.3 dB, RFB = ∞

2.3

FULL-CHANNEL (TGC)

CHARACTERISTICS

AAF Low-Pass Cutoff

In Range

−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

±0.5

Input-Referred Noise Voltage

GAIN+ = 1.6 V, RFB = ∞

LNA gain = 15.6 dB

1.26

nV/√Hz

LNA gain = 17.9 dB

1.04

nV/√Hz

LNA gain = 21.3 dB

0.85

nV/√Hz

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