CXA3355ERVQFN SONY [Sony Corporation], CXA3355ERVQFN Datasheet - Page 12

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

Measurement Methods
Note: The measurement methods in 4fo mode (TCXO = 16.368MHz, IF = 4.092MHz) are described below.
1) Total Gain
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
2) LNA NF
Input: LNA_IN
Output: LNA_OUT
Compensate for the evaluation board and coaxial cable loss, and measure the NF value at the IC end.
[Sony recommended measuring instruments]
Total Gain: Output level [dBm] – SG input level to LNA_IN [dBm]
Noise source: Agilent 346A
NF meter: Agilent N8973A
(2) Measure Pins 38 and 39 with a differential probe.
V
V
OPEN
OPEN
CC
CC
= 1.8V
= 1.8V
Evaluation
Board
Evaluation
Board
V
V
V
V
V
V
ENABLE
V
V
V
V
V
V
ENABLE
CC
CC
CC
CC
CC
CC
CC
CC
CC
CC
CC
CC
1 (PLL)
1 (LNA)
1 (RF)
1 (IF)
2 (IF)
3 (ANT)
1 (PLL)
1 (LNA)
1 (RF)
1 (IF)
2 (IF)
3 (ANT)
All GND pins
All GND pins
TESTOUTP
GND
GND
LNA_OUT
output level. ... [Sony recommended method]
LNA_IN
IC
IC
TESTOUT
TESTOUTN
External
buffer
Microwave coaxial cable
Microwave coaxial cable
Microwave coaxial cable
LNA_IN
TCXO
TCXO
– 12 –
Microwave coaxial cable
Microwave coaxial cable
Microwave coaxial cable
Noise Source
50
50
Spectrum Analyzer
50
50
Center freq. = 4.092MHz
SPAN = 10kHz
RBW = 100Hz
VBW = 100Hz
Signal Generator
NF meter
Signal Generator
freq. = 1575.42MHz
AMP. = –120dBm
Signal Generator
freq. = 1575.42MHz
BW = 2MHz
freq. = 16.368MHz
AMP. = 0dBm
freq. = 16.368MHz
AMP. = 0dBm
CXA3355ER