LT5528 LINER [Linear Technology], LT5528 Datasheet - Page 7

• Manufacturer Part Number: LT5528
• Description: 1.5GHz to 2.4GHz High Linearity Direct Quadrature Modulator
• Manufacturer: LINER [Linear Technology]

TYPICAL PERFOR A CE CHARACTERISTICS
PI FU CTIO S
EN (Pin 1): Enable Input. When the EN pin voltage is higher
than 1V, the IC is turned on. When the input voltage is less
than 0.5V, the IC is turned off.
GND (Pins 2, 4, 6, 9, 10, 12, 15): Ground. Pins 6, 9, 15
and 17 (exposed pad) are connected to each other inter-
nally. Pins 2 and 4 are connected to each other internally
and function as the ground return for the LO signal. Pins
10 and 12 are connected to each other internally and
function as the ground return for the on-chip RF balun.
For best RF performance, pins 2, 4, 6, 9, 10, 12, 15 and
the Exposed Pad 17 should be connected to the printed
circuit board ground plane.
LO (Pin 3): LO Input. The LO input is an AC-coupled single-
ended input with approximately 50Ω input impedance at
RF frequencies. Externally applied DC voltage should be
within the range –0.5V to V
turning on ESD protection diodes.
= 0dBm. BBPI, BBMI, BBPQ, BBMQ inputs 0.525V
sideband selection). P
U
–25
–30
–35
–40
–45
–50
0
LO Feed-Through and Image
Rejection at 2140MHz vs Baseband
Voltage and Supply Voltage
f
f
BBI
BBQ
I AND Q BASEBAND VOLTAGE (V
= 2MHz, 0°
= 2MHz, 90°
U
4.5V
5.5V
1
5V
2
RF, OUT
U
LOFT
3
= –10dBm (–10dBm/tone for 2-tone measurements), unless otherwise noted. (Note 3)
W
CC
4
P-P, DIFF
IR
+ 0.5V in order to avoid
5528 G18
U
)
5
DC
–10
–20
–30
–40
–50
, Baseband Input Frequency f
0
1.3
LO and RF Port Return Loss vs
RF Frequency
RF PORT,
EN = HIGH,
P
1.5
LO
= OFF
RF PORT,
EN = HIGH,
P
1.7
LO
RF FREQUENCY (GHz)
LO PORT, EN = LOW
= 0dBm
1.9
BBPQ, BBMQ (Pins 7, 5): Baseband Inputs for the Q-chan-
nel, each 45Ω input impedance. Internally biased at about
0.525V. Applied voltage must stay below 2.5V.
V
nected to each other internally. It is recommended to use
0.1µF capacitors for decoupling to ground on each of
these pins.
RF (Pin 11): RF Output. The RF output is an AC-coupled
single-ended output with approximately 50Ω output im-
pedance at RF frequencies. Externally applied DC voltage
should be within the range –0.5V to V
to avoid turning on ESD protection diodes.
BBPI, BBMI (Pins 14, 16): Baseband Inputs for the
I-channel, each with 45Ω input impedance. These pins are
internally biased at about 0.525V. Applied voltage must
stay below 2.5V.
Exposed Pad (Pin 17): Ground. This pin must be soldered
to the printed circuit board ground plane.
CC
2.1
(Pins 8, 13): Power Supply. Pins 8 and 13 are con-
RF PORT,
EN = LOW
2.3
LO PORT,
EN = HIGH
BB
2.5
V
= 2MHz, I&Q 90° shifted. f
5528 G19
CC
2.7
= 5V, EN = High, T
–10
–12
–14
–2
–4
–6
–8
0
1.3
RF Output Power vs
RF Frequency at 1V
Differential Baseband Drive
V
V
BBI
BBQ
1.5
= 1V
= 1V
A
= 25°C, f
P-P, DIFF
P-P, DIFF
1.7
RF FREQUENCY (GHz)
RF
= f
CC
4.5V, 25°C
5.5V, 25°C
1.9
5V, –40°C
BB
5V, 25°C
5V, 85°C
LO
+ 0.5V in order
+ f
= 2.14GHz, P
2.1
LT5528
P-P
LO
(upper
2.3
2.5
5528 G20
7
5528f
LO
2.7