MAX7033EUI(2011) データシートの表示（PDF） - Maxim Integrated

部品番号

コンポーネント説明

メーカー

MAX7033EUI
(Rev.:2011)

315MHz/433MHz ASK Superheterodyne Receiver with AGC Lock

Maxim Integrated 

315MHz/433MHz ASK Superheterodyne

Receiver with AGC Lock

injection is required due to the on-chip image-rejection

architecture. The IF output is driven by a source follow-

er biased to create a driving-point impedance of 330Ω;

this provides a good match to the off-chip 330Ω ceram-

ic 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 compo-

nents. The VCO generates a low-side LO. The relation-

ship between the RF, IF, and crystal frequencies is

given by:

fXTAL

=

fRF - 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

C2

C3

C4

C5

C6

C7

C8

C9

C10

C11

C12

C13

C14

C15

L1

L2

L3

R1

R2

R3

X1 (÷64)

X1 (÷32)

Y1

VALUE FOR fRF = 433MHz

100pF

2pF

100pF

100pF

1500pF

220pF

470pF

0.47μF

220pF

0.01μF

0.1μF

15pF

15pF

0.01μF

0.01μF

56nH

15nH

15nH

5.1kΩ

Open

Short

6.6128MHz**

13.2256MHz**

10.7MHz ceramic filter

VALUE FOR fRF = 315MHz

100pF

4pF

100pF

100pF

1500pF

220pF

470pF

0.47μF

220pF

0.01μF

0.1μF

15pF

15pF

0.01μF

0.01μF

120nH

15nH

27nH

5.1kΩ

Open

Short

4.7547MHz**

9.5094MHz**

10.7MHz ceramic filter

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

*Wire wound recommended.

**Crystal frequencies shown are for ÷64 (VXTALSEL = 0V) and ÷32 (VXTALSEL = VDD)

______________________________________________________________________________________ 11

Share Link: