Datasheet

AD9277
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, f
IN
= 5 MHz, R
S
= 50 Ω, LNA gain = 21.3 dB, LNA bias = high,
PGA gain = 24 dB, GAIN− = 0.8 V, AAF LPF cutoff = f
SAMPLE
/4.5, HPF cutoff = LPF cutoff/20.7 (default), f
SAMPLE
= 50 MSPS (Register 0x02 = 0x01),
full temperature, ANSI-644 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
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 V
Output Common Mode (LO-x) 1.5 V
Output Common Mode (LOSW-x) Switch off High-Z Ω
Switch on 1.5 V
Input Resistance (LI-x) R
FB
= 250 Ω 50 Ω
R
FB
= 500 Ω 100 Ω
R
FB
= ∞ 15 kΩ
Input Capacitance (LI-x) 22 pF
−3 dB Bandwidth 100 MHz
Input Noise Voltage R
S
= 0 Ω, R
FB
= ∞
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 R
FB
= ∞ 1 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 R
S
= 50 Ω
Active Termination Matched LNA gain = 15.6 dB, R
FB
= 200 Ω 4.8 dB
LNA gain = 17.9 dB, R
FB
= 250 Ω 4.1 dB
LNA gain = 21.3 dB, R
FB
= 350 Ω 3.2 dB
Unterminated LNA gain = 15.6 dB, R
FB
= ∞ 3.4 dB
LNA gain = 17.9 dB, R
FB
= ∞ 2.8 dB
LNA gain = 21.3 dB, R
FB
= ∞ 2.3 dB
FULL-CHANNEL (TGC)
CHARACTERISTICS
AAF Low-Pass Cutoff
In Range −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 ±2 ns
Input-Referred Noise Voltage GAIN+ = 1.6 V, R
FB
= ∞
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