ADL5374ACPZ-WP データシートの表示（PDF） - Analog Devices
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ADL5374ACPZ-WP Datasheet PDF : 20 Pages
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ADL5374
BASIC CONNECTIONS
Figure 25 shows the basic connections for the ADL5374.
QBBP
QBBN IBBN
IBBP
COM1 1
COM1 2
VPS1 3
VPS1 4
VPS1 5
VPS1
6
C12
0.1µF
Z1
F-MOD
EXPOSED PADDLE
C16
0.1µF
C15
0.1µF
18 VPS5
17 VPS4
16 VPS3
15 VPS2
14 VPS2
C14
0.1µF
VPOS
13
VOUT
C13
0.1µF
COUT
100pF
C11
OPEN
VOUT
GND
CLOP
100pF
RLOP
OPEN
4
CLON
100pF
RLON
OPEN
3
5
2
NC 6
1
LO
T1
JOHANSON
TECHNOLOGY
3600BL14M050
Figure 25. Basic Connections for the ADL5374
POWER SUPPLY AND GROUNDING
All the VPSx pins must be connected to the same 5 V source.
Adjacent pins of the same name can be tied together and decoupled
with a 0.1 μF capacitor. These capacitors should be located as
close as possible to the device. The power supply can range
between 4.75 V and 5.25 V.
The COM1 pin, COM2 pin, COM3 pin, and COM4 pin should
be tied to the same ground plane through low impedance paths.
The exposed paddle on the underside of the package should also
be soldered to a low thermal and electrical impedance ground
plane. If the ground plane spans multiple layers on the circuit
board, they should be stitched together with nine vias under the
exposed paddle. The AN-772 application note discusses the
thermal and electrical grounding of the LFCSP in detail.
BASEBAND INPUTS
The baseband inputs QBBP, QBBN, IBBP, and IBBN must be
driven from a differential source. The nominal drive level of
1.4 V p-p differential (700 mV p-p on each pin) should be
biased to a common-mode level of 500 mV dc.
The dc common-mode bias level for the baseband inputs may
range from 400 mV to 600 mV, which results in a reduction in
the usable input ac swing range. The nominal dc bias of 500 mV
allows for the largest ac swing, limited on the bottom end by the
ADL5374 input range and on the top end by the output compliance
range on most DACs from Analog Devices.
LO INPUT
The LO input should be driven differentially. The recommended
balun for the ADL5374 is the Johanson Technology model
3600BL14M050. The LO pins (LOIP and LOIN) should be ac-
coupled to the balun. A noticeable degradation in second-order
distortion and IP2 occurs when the device is driven single-ended.
The nominal LO drive of 0 dBm can be increased up to 6 dBm to
realize a slight improvement in the noise performance of the
modulator. If the LO source cannot provide the 0 dBm level,
operation at a reduced power below 0 dBm is acceptable.
Reduced LO drive results in slightly increased modulator noise.
The effect of LO power on sideband suppression and carrier
feedthrough is shown in Figure 20 and Figure 21.
RF OUTPUT
The RF output is available at the VOUT pin (Pin 13). The VOUT
pin connects to an internal balun, which is capable of driving a
50 Ω load. For applications requiring 50 Ω output impedance,
external matching is needed (see Figure 8 for S22 performance).
The internal balun provides a low dc path to ground. In most
situations, the VOUT pin should be ac-coupled to the load.
Rev. 0 | Page 12 of 20
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