AD8345ARE-REEL7 Analog Devices Inc, AD8345ARE-REEL7 Datasheet - Page 18

• Manufacturer Part Number: AD8345ARE-REEL7
• Description: IC QUADRATURE MOD 250MHZ 16TSSOP
• Manufacturer: Analog Devices Inc

Specifications of AD8345ARE-REEL7

• Rohs Status: RoHS non-compliant
• Function: Modulator
• Lo Frequency: 250MHz ~ 1GHz
• Rf Frequency: 140MHz ~ 1GHz
• P1db: 2.5dBm
• Noise Floor: -155dBm/Hz
• Output Power: 2dBm
• Current - Supply: 78mA
• Voltage - Supply: 2.7 V ~ 5.5 V
• Test Frequency: 800MHz
• Package / Case: 16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP

AD8345
MODULATED WAVEFORM SETUP
To evaluate the AD8345 with modulated waveforms, the setup
shown in Figure 38 is used. A Rohde & Schwarz AMIQ signal
generator with differential outputs is used to generate the
baseband signals. For all measurements, the input level on each
baseband input pin is 0.7 V ±0.3 V peak. The output is
measured with a Rohde & Schwarz FSIQ spectrum/vector
analyzer.
CDMA IS95
To measure ACPR, the I and Q input signals used are generated
with Pilot channel (Walsh Code 00), Sync channel (WC 32), Paging
channel (WC 01), and six Traffic (WC 08, 09, 10, 11, 12, 13)
channels active. Figure 39 shows the typical output spectrum for
this configuration.
To perform EVM, Rho, phase, and amplitude balance
measurements, the I and Q input signals used are generated
with only the Pilot channel (Walsh Code 00) active.
IEEE
IEEE
PC CONTROLLER
Figure 38. Test Setup for Evaluating AD8345 with Modulated Waveforms
HP8648C
–100
–110
–10
–20
–30
–40
–50
–60
–70
–80
–90
RFOUT
CENTER = 880MHz
IEEE
Figure 39. Typical IS95 Output Spectrum
HP3631
PC CONTROL
IN
+15V MAX
+25V MAX
–25V MAX
IN
LO
ENBL
CHARACTERIZATION
COM
IP
IP
AD8345
BOARD
AMIQ
P1
QP
QP
CH PWR = –12.41dBm
ACP UP = –72.9dB
ACP LOW = –72.9dB
VOUT
QN
SPAN = 7.5MHz
QN
RF I/P
SPECTRUM
ANALYZER
FSIQ
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Rev. B | Page 18 of 20
WCDMA 3GPP
To evaluate the AD8345 for WCDMA, the 3GPP standard is
used with a chip rate of 3.84 MHz. The plot in Figure 40 is an
ACPR plot of the AD8345 using Test Model 1 from the 3GPP
specification with 64 channels active.
GSM
To compare the AD8345 output to the GSM transmit mask, I
and Q signals are generated using MSK modulation, GSM
differential coding, a Gaussian filter, and a symbol rate of
270.833 kHz. The transmit mask is manually generated on the
FSIQ using the GSM BTS specification for reference. The plot in
Figure 41 shows that the AD8345 meets the GSM transmit
mask requirements.
–100
–100
–110
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
0
Figure 40. Typical AD8345 WCDMA 3GPP Output Spectrum
Figure 41. Typical AD8345 GSM Output Spectrum
CENTER = 380MHz
CENTER = 900MHz
CH PWR = –10.95dBm
ACP UP = –52.51dB
ACP LOW = –52.41dB
SPAN = 14.7MHz
SPAN = 1MHz