MAX7033 データシートの表示（PDF） - Maxim Integrated
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MAX7033 Datasheet PDF : 16 Pages
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MAX7033
315MHz/433MHz ASK Superheterodyne
Receiver with AGC Lock
is required due to the on-chip image-rejection architec-
ture. The IF output is driven by a source follower biased to
create a driving-point impedance of 330Ω; this provides a
good match to the off-chip 330Ω ceramic IF filter.
The IRSEL pin is a logic input that selects one of the
three possible image-rejection frequencies. When VIRSEL
= 0V, the image rejection is tuned to 315MHz. VIRSEL =
VDD5/2 tunes the image rejection to 375MHz, and VIRSEL
= VDD5 tunes the image rejection to 433MHz. The IRSEL
pin is internally set to VDD5/2 (image rejection at 375MHz)
when it is left unconnected, thereby eliminating the need
for an external VDD5/2 voltage.
Phase-Locked Loop
The PLL block contains a phase detector, charge pump,
integrated loop filter, VCO, asynchronous 64x clock
divider, and crystal oscillator driver. Besides the crystal,
this PLL does not require any external components. The
VCO generates a low-side LO. The relationship between
the RF, IF, and crystal frequencies is given by:
f XTAL
=
f RF- f IF
32 × M
where:
M = 1 (VXTALSEL = VDD5) or 2 (VXTALSEL = 0V)
To allow the smallest possible IF bandwidth (for best sen-
sitivity), minimize the tolerance of the reference crystal.
Table 1. Component Values for Typical Application Circuit
COMPONENT
C1
VALUE FOR fRF = 433MHz
100pF
VALUE FOR fRF = 315MHz
100pF
C2
2pF
4pF
C3
100pF
100pF
C4
100pF
100pF
C5
1500pF
1500pF
C6
220pF
220pF
C7
470pF
470pF
C8
0.47µF
0.47µF
C9
220pF
220pF
C10
0.01µF
0.01µF
C11
0.1µF
0.1µF
C12
15pF
15pF
C13
15pF
15pF
C14
0.01µF
0.01µF
C15
0.01µF
0.01µF
L1
56nH
120nH
L2
15nH
15nH
L3
15nH
27nH
R1
5.1kΩ
5.1kΩ
R2
Open
Open
R3
Short
Short
X1 (÷64)
6.6128MHz**
4.7547MHz**
X1 (÷32)
13.2256MHz**
9.5094MHz**
Y1
10.7MHz ceramic filter
10.7MHz ceramic filter
*Wire wound recommended.
**Crystal frequencies shown are for ÷64 (VXTALSEL = 0V) and ÷32 (VXTALSEL = VDD)
DESCRIPTION
5%
± 0.1pF
5%
5%
10%
5%
5%
20%
10%
20%
20%
Depends on XTAL
Depends on XTAL
20%
20%
5% or better*
5% or better*
5% or better*
5%
—
—
Crystek or Hong Kong Crystal
Crystek or Hong Kong Crystal
Murata
www.maximintegrated.com
Maxim Integrated │ 11
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