AD8341ACPZ-WP Analog Devices Inc, AD8341ACPZ-WP Datasheet - Page 15

• Manufacturer Part Number: AD8341ACPZ-WP
• Description: IC MOD VECT 1.5-2.4GHZ 24LFCSP
• Manufacturer: Analog Devices Inc

Specifications of AD8341ACPZ-WP

• Function: Vector, Modulator
• Lo Frequency: 1.5GHz ~ 2.4GHz
• Rf Frequency: 1.5GHz ~ 2.4GHz
• P1db: 8.5dBm
• Noise Floor: -150.5dBm/Hz
• Current - Supply: 145mA
• Voltage - Supply: 4.75 V ~ 5.25 V
• Test Frequency: 1.9GHz
• Package / Case: 24-VFQFN, CSP Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Holding the differential I and Q control voltages steady at
0.353 V, input power was swept. Figure 36 shows variation in
spurious content, again measured at ±2.25 MHz carrier offset in
a 1 MHz bandwidth, as defined by the 3GPP2 specification.
With a fixed input power of 2.4 dBm, the output power was
again swept by exercising the I and Q inputs. V
kept equal and were swept from 100 mV to 500 mV. The result-
ing output power and ACP are shown in Figure 37.
Measured at ±2.25 MHz Carrier Offset in 1 MHz BW Input Signal Filtered
Test Model at −4 dBm, V
–100
–112
Figure 35. Output Spectrum, 1960 MHz, Single-Carrier CDMA2000
–12
–20
–30
–40
–50
–60
–70
–80
–90
–70
–72
–74
–76
–78
–80
–82
–84
–86
–88
–90
±2.25 MHz Carrier Offset (1 MHz BW); V
REF LVL
–12dBm
CENTER 1.96Hz
CDMA2000 Single Carrier @ 1960 MHz; ACP Measured at
–20
1AVG
Figure 36. Adjacent Channel Power vs. Output Power,
0.3dB OFFSET
Using a Cavity Tuned Filter (Pass Band = 6.8 MHz)
–18
C11
–16
MARKER 1 [T1 ]
–18.47dBm
1.95999900GHz
C11
–14
BBI
OUTPUT POWER (dBm)
= V
–12
BBQ
C0
1MHz/
= 0.353 V, Adjacent Channel Power
1
–10
C0
RBW 30kHz
VBW 100kHz
SWT 500ms
1 [T1]
CH PWR
ACP UP
ACP LOW
–8
CU1
BBI
–6
= V
CU1
1.95999900GHz
BBQ
BBI
–4
SPAN 10MHz
–18.47dBm
–77.64dBm
–76.66dBm
= 0.353 V
RF ATT 0dB
UNIT dBm
–4.06dBm
and V
–2
BBQ
1RM
A
0
were
Rev. 0 | Page 15 of 20
Figure 37 shows that for a fixed input power, the ACP (measured in
dBm) tracks the output power as the gain is changed.
WCDMA APPLICATION
Figure 38 shows a plot of the output spectrum of the AD8341
transmitting a single-carrier WCDMA signal (Test Model 1-64
at 2140 MHz). The carrier power is approximately −9 dBm. The
differential I and Q control voltages are both equal to 0.353 V,
that is, the vector is sitting on the unit circle at 45°. At this
power level, an adjacent channel power ratio of −61 dBc is
achieved. The alternate channel power ratio of −72 dBc is
dominated by the noise floor of the AD8341.
Figure 39 shows how ACPR and noise vary with varying input
power (differential I and Q control voltages are held at 0.353 V).
At high power levels, both adjacent and alternate channel power
ratios increase sharply. As output power drops, adjacent and
alternate channel power ratios both reach minimums before the
measurement becomes dominated by the noise floor of the
AD8341. At this point, adjacent and alternate channel power
ratios become approximately equal.
–10
–15
–20
–25
–30
–100
–120
–124
–110
Figure 38. AD8341 Single-Carrier WCDMA Spectrum at 2140 MHz
–5
–24
–30
–40
–50
–60
–70
–80
–90
0
Figure 37. Output Power and ACP vs. I and Q Control Voltages,
0
CENTER 2.14GHz
REF LVL
–24dBm
C12
CDMA2000 Test Model, V
OFFSET 1dB
0.1
±2.25 MHz Carrier Offset in 1 MHz BW
C12
C11
MARKER 1 [T1 ]
–28.39dBm
2.14050000GHz
IQ CONTROL VOLTAGE
0.2
C11
C0
2.5MHz/
BBI
0.3
= V
1
C0
BBQ
RBW 30kHz
VBW 300kHz
SWT 1s
CU1
1 [T1]
CH PWR
ACP UP
ACP LOW
ALT1 UP
ALT1 LOW
, ACP Measured at
0.4
CU1
2.14050000GHz
SPAN 25MHz
–28.39dBm
RF ATT 0dB
UNIT dBm
–8.95dBm
0.5
–60.78dB
–60.82dB
–72.67dB
–72.66dB
AD8341
CU2
–60
–65
–70
–75
–80
–85
–90
1RM
A