Datasheet
AD9279
Rev. 0 | 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), f
IN
= 5 MHz,
R
S
= 50 Ω, R
FB
= ∞ (unterminated), LNA gain = 21.3 dB, LNA bias = default, PGA gain = 27 dB, GAIN− = 0.8 V, GAIN+ = 0 V, AAF LPF
cutoff = f
SAMPLE
/3 (MODE I/II) = f
SAMPLE
/4.5 (MODE III), HPF cutoff = LPF cutoff/12, MODE I = f
SAMPLE
= 40 MSPS, MODE II = f
SAMPLE
=
65 MSPS, MODE III = f
SAMPLE
= 80 MSPS, low power LVDS mode, unless otherwise noted.
Table 1.
Parameter
1
Test Conditions/Comments Min Typ Max Unit
LNA CHARACTERISTICS
Gain
Single-ended input to differential
output
15.6/17.9/21.3 dB
Single-ended input to single-ended
output
9.6/11.9/15.3 dB
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 V
Output Common Mode (LO-x) Switch off High-Z Ω
Switch on 1.5 V
Output Common Mode (LOSW-x) Switch off High-Z Ω
Switch on 1.5 V
Input Resistance (LI-x) R
FB
= 350 Ω, LNA gain = 21.3 dB 50 Ω
R
FB
= 1400 Ω, LNA gain = 21.3 dB 200 Ω
R
FB
= ∞, LNA gain = 21.3 dB 6 kΩ
Input Capacitance (LI-x) 22 pF
−3 dB Bandwidth LNA gain = 15.6 dB 150 MHz
LNA gain = 17.9 dB 130 MHz
LNA gain = 21.3 dB 100 MHz
Input Noise Voltage R
S
= 0 Ω, R
FB
= ∞
LNA gain = 15.6 dB 0.95 nV/√Hz
LNA gain = 17.9 dB 0.85 nV/√Hz
LNA gain = 21.3 dB 0.75 nV/√Hz
Input Noise Current R
FB
= ∞ 2.5 pA/√Hz
Noise Figure R
S
= 50 Ω
Active Termination Matched LNA gain = 15.6 dB, R
FB
= 200 Ω 4.5 dB
LNA gain = 17.9 dB, R
FB
= 250 Ω 3.7 dB
LNA gain = 21.3 dB, R
FB
= 350 Ω 2.9 dB
Unterminated LNA gain = 15.6 dB, R
FB
= ∞ 3.1 dB
LNA gain = 17.9 dB, R
FB
= ∞ 2.6 dB
LNA gain = 21.3 dB, R
FB
= ∞ 2.2 dB
FULL-CHANNEL (TGC)
CHARACTERISTICS
AAF Low-Pass Cutoff −3 dB, programmable 8 18 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 ns