CXA3355ERVQFN SONY [Sony Corporation], CXA3355ERVQFN Datasheet - Page 13

• Manufacturer Part Number: CXA3355ERVQFN
• Description: GPS Down Converter IC
• Manufacturer: SONY [Sony Corporation]

3) Total NF
Input: LNA_IN
Output: TESTOUTP (Pin 38), TESTOUTN (Pin 39) ... [Pins 38 and 39 are differential output.]
Serial data setting: Test output block "3" (IF filter output block) ... See page 19.
Monitor method: (1) Perform differential – single conversion using an external buffer circuit and measure the
4) P-1dB Input
Input: LNA_IN
Output: TESTOUTP (Pin 38), TESTOUTN (Pin 39) ... [Pins 38 and 39 are differential output.]
Serial data setting: Test output block "4" (IF AMP2 output block) ... See page 19.
Monitor method: (1) Perform differential – single conversion using an external buffer circuit and measure the
Total NF: Calculate NF from the noise power ratio when the DC 28V applied to the noise source is switched
Use the 346A made by Agilent as the noise source for measurement.
P-1dB Input: Input level [dBm] at the point when the response drops by 1dB from the desired signal straight
V
OPEN
CC
= 1.8V
on and off.
Evaluation
Board
V
V
V
V
V
V
ENABLE
CC
CC
CC
CC
CC
CC
line extension.
1 (PLL)
1 (LNA)
1 (RF)
1 (IF)
2 (IF)
3 (ANT)
All GND pins
(2) Measure Pins 38 and 39 with a differential probe.
(2) Measure Pins 38 and 39 with a differential probe.
TESTOUTP
GND
V
OPEN
CC
= 1.8V
LNA_IN
IC
Evaluation
Board
V
V
V
V
V
V
ENABLE
TESTOUT
TESTOUTN
CC
CC
CC
CC
CC
CC
External
buffer
1 (PLL)
1 (LNA)
1 (RF)
1 (IF)
2 (IF)
3 (ANT)
All GND pins
Microwave coaxial cable
TESTOUTP
GND
TCXO
Noise Source
Microwave coaxial cable
LNA_IN
IC
output level. ... [Sony recommended method]
output level. ... [Sony recommended method]
TESTOUT
TESTOUTN
External
buffer
50
Microwave coaxial cable
TCXO
Microwave coaxial cable
DC 28V
ON/OFF
Spectrum Analyzer
50
– 13 –
Center freq. = 4.092MHz
SPAN = 10kHz
RBW = 100Hz
VBW = 100Hz
Microwave coaxial cable
Signal Generator
freq. = 16.368MHz
AMP. = 0dBm
50
50
Spectrum Analyzer
50
Center freq. = 4.092MHz
SPAN = 10kHz
RBW = 100Hz
VBW = 100Hz
Signal Generator
freq. = 1575.42MHz
AMP. = –120 to –90dBm
Signal Generator
freq. = 16.368MHz
AMP. = 0dBm
NF calculation formula
N
N
ENR: Excess Noise Ratio
ON
OFF
Y =
NF = 10 log
: Noise power when the
: Noise power when the
DC 28V is on.
DC 28V is off.
N
N
OFF
ON
( )
Y – 1
ENR
CXA3355ER