AD8345ARE Analog Devices Inc, AD8345ARE Datasheet - Page 15

• Manufacturer Part Number: AD8345ARE
• Description: Quadrature Mod 80MHz 16-Pin TSSOP EP Tube
• Manufacturer: Analog Devices Inc

Specifications of AD8345ARE

• Package: 16TSSOP EP
• Device Type: Modulator
• Maximum I/q Frequency: 80 MHz
• Modulation Type: Quadrature
• Operating Supply Voltage: 3.3|5 V
• 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

SOLDERING INFORMATION
The AD8345 is packaged in a 16-lead TSSOP_EP package. For
optimum thermal conductivity, the exposed pad can be
soldered to the exposed metal of a ground plane. This results in
a junction-to-air thermal impedance (θ
soldering is not necessary for safe operation. If the exposed pad
is not soldered down, then the θ
EVALUATION BOARD
Figure 32 shows the schematic of the AD8345 evaluation board.
Note that uninstalled components are marked as open. This is a
4-layer board, with the two center layers used as ground plane,
and top and bottom layers used as signal and power planes.
SELECT
INPUTS
CLOCK
WRITE
DATA
DAC
VPOS
CONTROL
MUX
LO
DVDD
ENBL
R6
50Ω
C3
0.01μF
LATCH
LATCH
"Q"
"I"
JA
DCOM
is equal to 95°C/W.
SLEEP
5
4
IP
IN
ETC1-1-13
R7
0Ω
JA
R8
10kΩ
) of 30°C/W. However,
T1
AD9761
FS ADJ
2⋅
2⋅
C4
1000pF
R
2kΩ
1
2
3
SET
B
VPOS
(OPEN)
A
1000pF
1000pF
R1
(OPEN)
Figure 32. Evaluation Board Schematic
C1
C2
AVDD
R2
Figure 31. AD8345/TxDAC Interface
SW1
DAC
DAC
REFIO
"Q"
"I"
Rev. B | Page 15 of 20
0.1μF
1
2
3
4
5
6
7
8
COM1
IBBP
IBBN
COM3
LOIN
LOIP
VPS1
ENBL
QOUTA
QOUTB
IOUTA
IOUTB
AD8345
140Ω
140Ω
QBBN
COM3
QBBP
COM3
COM2
COM3
VOUT
VPS2
The board is powered by a single supply (V
to 5.5 V. The power supply is decoupled by 0.01 μF and 1000 pF
capacitors. The circuit closely follows the basic connection
schematic with SW1 in Position B. If SW1 is in Position A, the
enable pin (ENBL) is pulled to ground by a 10 kΩ resistor, and
the device is in its power-down mode.
All connectors are SMA-type. The I and Q inputs are dc-coupled to
allow a direct connection to a dual DAC with differential outputs.
Resistor pads are provided in case termination at the I and Q inputs
is required. The local oscillator input (LO) is terminated to approxi-
mately 50 Ω with an external 50 Ω resistor to ground. A 1:1 wide-
band transformer (ETC1-1-13) provides a differential drive to the
AD8345’s differential LO input.
16
15
14
13
12
11
10
9
140Ω
140Ω
1000pF
R10
(OPEN)
R9
(OPEN)
C7
210Ω
210Ω
C5
1000pF
R14
(OPEN)
R12
R11
0Ω
0Ω
IBBP
IBBN
QBBP
QBBN
R15
(OPEN)
VPS1
C6
0.01μF
SPLITTER
PHASE
QP
QN
VPOS
VOUT
S
) in the range 2.7 V
VPS2
AD8345
Σ
AD8345
VOUT
LOIP
LOIN