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AD8348
Parameter
Conditions
Min
Typ
Max
Unit
IF FRONT END WITHOUT VGA
From MXIP, MXIN to IMXO (QMXO),
ENVG = 0 V, IMXO/QMXO load = 1.5 kΩ
Input Impedance
Conversion voltage Gain
3 dB Output Bandwidth
IF Gain Flatness
Measured differentially across MXIP/MXIN
F IF = 380 MHZ ± 5%
200||1.5
10.5
75
0.1
Ω||pF
dB
MHz
dB p-p
Input 1 dB Compression Point (P1dB)
F IF = 900 MHZ ± 5%
0.15
?4
dB p-p
dBm
Third-Order Input Intercept (IIP3)
IF1 = 381 MHz, IF2 = 381.02 MHz
14
dBm
Each tone 10 dB below P1dB from
200 Ω source
LO Leakage
Demodulation Bandwidth
Measured at MXIP/MXIN
Measured at IMXO, QMXO
Small signal 3 dB bandwidth
?70
?60
75
dBm
dBm
MHz
Quadrature Phase Error
LO = 380 MHz (LOIP/LOIN 760 MHz,
?2
±0.5
+2
Degrees
single-ended)
I/Q Amplitude Imbalance
0.25
dB
Noise Figure (Double Sideband)
I/Q BASEBAND AMPLIFIER
From 200 Ω source, F IF = 380 MHz
From IAIN to IOPP/IOPN and QAIN to QOPP/
21
dB
QOPN, R LOAD = 2 kΩ, single-ended to ground
Gain
20
dB
Bandwidth
10 pF differential load
125
MHz
Output DC Offset (Differential)
LO leakage offset corrected using 500 pF
?50
±12
+50
mV
capacitor on IOFS, QOFS (V IOPP ? V IOPN )
Output Common-Mode Offset
Group Delay Flatness
Input-Referred Noise Voltage
(V IOPP + V IOPN )/2 ? VCMO
0 MHz to 50 MHz
Frequency = 1 MHz
?75
±35
3
8
+75
mV
ns p-p
nV/√Hz
Output Swing Limit (Upper)
Output Swing Limit (Lower)
Peak Output Current
Input Impedance
Input Bias Current
RESPONSE FROM IF AND MX INPUTS TO
BASEBAND AMPLIFIER OUTPUT
IMXO and QMXO connected directly to
IAIN and QAIN, respectively
V S ?1
1
50||1
2
0.5
V
V
mA
kΩ||pF
μA
Gain
From MXIP/MXIN
From IFIP/IFIN, VGIN = 0.2 V
From IFIP/IFIN, VGIN = 1.2 V
30.5
45.5
1.5
dB
dB
dB
CONTROL INPUT/OUTPUTS
VCMO Input Range
V S = 5 V
0.5
1
4
V
VREF Output Voltage
V S = 2.7 V
0.5
0.95
1
1
1.7
1.05
V
V
Gain Control Voltage Range
VGIN
0.2
1.2
V
Gain Slope
?55
?50
?45
dB/V
Gain Intercept
Linear extrapolation back to theoretical
55
61
67
dB
gain at VGIN = 0 V
Gain Control Input Bias Current
LO INPUTS
1
μA
LOIP Input Return Loss
LOIN ac-coupled to ground
?6
dB
(760 MHz applied to LOIP)
Rev. A | Page 4 of 28
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