Datasheet

AD9271
Rev. B | Page 4 of 60
SPECIFICATIONS
AC SPECIFICATIONS
AVDD = 1.8 V, DRVDD = 1.8 V, CWVDD = 3.3 V, 1.0 V internal ADC reference, f
IN
= 5 MHz, R
S
= 50 Ω, LNA gain = 15.6 dB (6), AAF
LPF cutoff = 1/3 × f
S
, HPF cutoff = 700 kHz, full temperature, unless otherwise noted.
Table 1.
AD9271-25 AD9271-40 AD9271-50
Parameter
1
Conditions Min Typ Max Min Typ Max Min Typ Max Unit
LNA CHARACTERISTICS
Gain = 5/6/8 Single-ended input
to differential output
14/15.6/18 14/15.6/18 14/15.6/18 dB
Single-ended input
to single-ended
output
8/9.6/12 8/9.6/12 8/9.6/12 dB
Input Voltage Range,
Gain = 5/6/8
LNA output limited
to 2 V p-p differential
output
400/333/250 400/333/250 400/333/250 mV p-p
SE
2
Input Common
Mode
1.4 1.4 1.4 V
Input Resistance RFB = 200 Ω 50 50 50 Ω
RFB = 400 Ω 100 100 100 Ω
RFB = ∞ 15 15 15 kΩ
Input Capacitance LI-x 15 15 15 pF
−3 dB Bandwidth 40 60 70 MHz
Input Noise Current,
Gain = 5/6/8
1.1 1.1 1.1 pA/√Hz
Input Noise Voltage,
Gain = 5/6/8
R
S
= 0 Ω, RFB = ∞ 1.4/1.4/1.3 1.3/1.2/1.1 1.3/1.2/1.1 nV/√Hz
1 dB Input
Compression
Point, Gain = 5/6/8
V
GAIN
= 0 V 770/650/495 770/650/495 770/650/495 mV p-p
Noise Figure
Active Termination
Match
R
S
= 50 Ω, RFB = 200 Ω 6.7 6.7 6.7 dB
Unterminated RFB = ∞ 4.9 4.4 4.2 dB
FULL-CHANNEL (TGC)
CHARACTERISTICS
AAF High-Pass Cutoff −3 dB DC/350/700 DC/350/700 DC/350/700 kHz
AAF Low-Pass Cutoff −3 dB, programmable 1/3 × f
SAMPLE
(8 to 18)
1/3 × f
SAMPLE
(8 to 18)
1/3 × f
SAMPLE
(8 to 18)
MHz
Bandwidth Tolerance ±15 ±15 ±15 %
Group Delay Variation f = 1 to 18 MHz,
gain = 0 V to 1 V
±2 ±2 ±2 ns
Input-Referred Noise
Voltage
LNA gain = 5/6/8,
RFB = ∞
1.7/1.6/1.5 1.6/1.4/1.3 1.6/1.4/1.2 nV/√Hz
Correlated Noise Ratio No signal, correlated/
uncorrelated
−30 −30 −30 dB
Output Offset AAF high pass =
700 kHz
−50 +50 −35 +35 −35 +35 LSB
Signal-to-Noise Ratio
(SNR)
f
IN
= 5 MHz
at −7 dBFS
V
GAIN
= 0 V 65.8 64.4 63.7 dBFS
f
IN
= 5 MHz
at −1 dBFS
V
GAIN
= 1 V 62 59.7 59 dBFS