Datasheet

AD9272
Rev. C | Page 4 of 44
SPECIFICATIONS
AC SPECIFICATIONS
AVDD1 = 1.8 V, AVDD2 = 3.0 V, DRVDD = 1.8 V, 1.0 V internal ADC reference, f
IN
= 5 MHz, R
S
= 50 Ω, LNA gain = 21.3 dB, LNA bias = high,
PGA gain = 27 dB, GAIN− = 0.8 V, AAF LPF cutoff = f
SAMPLE
/4.5, HPF = LPF cutoff/20.7 (default), full temperature, ANSI-644 LVDS mode,
unless otherwise noted.
Table 1.
AD9272-40 AD9272-65 AD9272-80
Parameter
1
Conditions Min Typ Max Min Typ Max Min Typ Max Unit
LNA CHARACTERISTICS
Gain Single-ended
input to
differential output
15.6/17.9/21.3 15.6/17.9/21.3 15.6/17.9/21.3 dB
Single-ended
input to
single-ended
output
9.6/11.9/15.3 9.6/11.9/15.3 9.6/11.9/15.3 dB
Input Voltage Range LNA gain =
15.6 dB/
17.9 dB/
21.3 dB,
LNA output
limited to
4.4 V p-p
differential output
733/550/367 733/550/367 733/550/367 mV p-p
SE
2
Input Common
Mode
0.9 0.9 0.9 V
Input Resistance R
FB
= 250 Ω 50 50 50 Ω
R
FB
= 500 Ω 100 100 100 Ω
R
FB
= ∞ 15 15 15 kΩ
Input Capacitance LI-x 22 22 22 pF
−3 dB Bandwidth 100 100 100 MHz
Input-Referred
Noise Voltage
LNA gain =
15.6 dB/
17.9 dB/
21.3 dB,
R
S
= 0 Ω,
R
FB
= ∞
0.98/0.86/0.75 0.98/0.86/0.75 0.98/0.86/0.75 nV/√Hz
Input Noise Current R
FB
= ∞ 1 1 1 pA/√Hz
1 dB Input Com-
pression Point
LNA gain =
15.6 dB/
17.9 dB/
21.3 dB,
GAIN+ = 0 V
1.0/0.8/0.5 1.0/0.8/0.5 1.0/0.8/0.5 mV p-p
Noise Figure LNA gain =
15.6 dB/
17.9 dB/
21.3 dB
Active Termination
Matched
R
S
= 50 Ω,
R
FB
= 200 Ω/
250 Ω/350 Ω
4.8/4.1/3.2 4.8/4.1/3.2 4.8/4.0/3.2 dB
Unterminated R
FB
= ∞ 3.4/2.8/2.3 3.4/2.8/2.3 3.4/2.8/2.3 dB
FULL-CHANNEL (TGC)
CHARACTERISTICS
AAF Low-Pass Filter
Cutoff -In Range
−3 dB,
programmable
8 to 18 8 to 18 8 to 18 MHz
AAF Low-Pass Filter
Cutoff - Out of
Range
3
−3 dB,
programmable,
AAF Bandwidth
Tolerance
5 to 8 and
18 to 35
5 to 8 and
18 to 35
5 to 8 and
18 to 35
MHz
AAF Bandwidth
Tolerance -In
Range
±10 ±10 ±10 %