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参数资料
| 型号： | MAX2426EAI |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 无绳电话/电话 |
| 英文描述： | 900MHz Image-Reject Receivers with Transmit Mixer |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PDSO28 |
| 封装： | SSOP-28 |
| 文件页数： | 11/14页 |
| 文件大小： | 163K |
| 代理商： | MAX2426EAI |
M
900MHz Image-Reject Receiver
with Transmit Mixer
______________________________________________________________________________________
11
For example, if V
CC
= 3.3V and P
OUT
= -8dBm, choose
R
T
= 100k
for sufficient current through the divider, so
that bias currents for
TXIN
and TXIN have little effect
over temperature. Set V
TXIN
= 2.3V to satisfy common-
mode voltage range requirements at V
CC
= 3.3V.
Use the Transmit Output Power vs. Input Voltage graph
in the Typical Operating Characteristics to determine
the input voltage (in mVp-p) required to produce the
desired output. Divide this value by 2
√
2
and use it for
V
DIFF
. A -8dBm transmitter output requires 250mVp-p /
2
√
2
= 88.4mV.
V
TXIN
= 2.3V + 0.0884V = 2.3884V
R
T
= R1 + R2 + R3
Solve for resistors R1, R2, and R3 with the following
equations:
Since the transmit and receive sections typically require
different LO frequencies, it is not recommended to have
both transmit and receive active at the same time.
Phase Shifter
The MAX2424/MAX2426 uses passive networks to pro-
vide quadrature phase shifting for the receive IF and LO
signals. Because these networks are frequency selec-
tive, both the RF and IF frequency operating ranges are
limited. Image rejection degrades as the IF and RF
moves away from the designed optimum frequencies.
The MAX2424/MAX2426’s phase shifters are arranged
such that the LO frequency is higher than the RF carrier
frequency (high-side injection).
Local Oscillator (LO)
The on-chip LO is formed by an emitter-coupled differ-
ential pair. An external LC resonant tank sets the oscil-
lation frequency. A varactor diode is typically used to
create a voltage-controlled oscillator (VCO). See the
Applications Information section for an example VCO
tank circuit.
The LO may be overdriven in applications where an
external signal is available. The external LO signal
should be about 0dBm from 50
, and should be AC
coupled into either the TANK or
TANK
pin. Both TANK
and
TANK
require pull-up resistors to V
CC
. See the
Applications Information section for details.
The local oscillator resists pulling caused by changes
in load impedance that occur as the part is switched
from standby mode, with just the oscillator running to
either transmit or receive mode. The amount of LO
pulling is affected if a signal is present at the RXIN port
in transmit mode. The most common cause of pulling is
imperfect isolation in an external transmit/
receive (T/R) switch. The AC Electrical Characteristics
table contains specifications for this case as well.
Prescaler
The on-chip prescaler operates in two different modes:
as a dual-modulus divide-by-64/65, or as an oscillator
buffer amplifier. The DIV1 pin controls this function.
When DIV1 is low, the prescaler is in dual-modulus
divide-by-64/65 mode; when it is high, the prescaler is
disabled and the oscillator buffer amplifier is enabled.
The buffer typically outputs -8dBm into a 50
load. To
minimize shutdown supply current, pull the DIV1 pin
low when in shutdown mode.
In divide-by-64/65 drive mode, the division ratio is con-
trolled by the MOD pin. Drive MOD high to operate the
prescaler in divide-by-64 mode. Drive MOD and DIV1
low to operate the prescaler in divide-by-65 mode.
R3
V
x R
V
R2
V
– V
x R
V
R1
R – R2 – R3
T
CC
TXIN
T
CC
=
=
(
)
=
TXIN
TXIN
R
T
= R
1
+ R
2
+ R
3
V
DIFF
= V
TXIN
- V
TXIN
R1
i
R2
R3
2M
V
CC
1.5
μ
A
TXIN
1.5
μ
A
TXIN
MAX2424
MAX2426
Figure 3. Biasing TXIN and
TXIN
for FM
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