MAX9947ETE 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

MAX9947ETE

AISG Integrated Transceiver

Maxim Integrated 

MAX9947

AISG Integrated Transceiver

TXIN IDLE

START 1

BIT

TXOUT AND RXIN IDLE

RXOUT IDLE (LOGIC-LEVEL HIGH)tTX

1

0

1

1

0

0

STOP BIT

IDLE

0

IDLE

DIR IDLE (LOGIC-LEVEL LOW)

Figure 2. The MAX9947 on the Tower: Communication Flow is from the Tower to the Base

Table 1. Bit-Time Duration Selector

DIRMD2*

0

DIRMD1*

0

0

1

1

0

1

1

*DIRMD1 and DIRMD2 are internally pulled down.

AISG DATA RATE (kbps)

9.6

38.4

115.2

Not used

UNITY BIT TIME (µs)

104.16

26.04

8.68

Not used

-5dBm

+5dBm

-5dBm

-25dBm

-25dBm

-36dBm

9kHz

1MHz

fO

200kHz

400kHz

1MHz

-36dBm

-67dBm

10MHz 20MHz 30MHz

400MHz

-125dBm

12.75GHz

Emissions Spectrum with 50% Duty-Cycle OOK, Conforms to AISG TS 25.461

Figure 3. AISG Standard Modem Spectrum Emission Mask

Applications Information

Emission Output Proile

The AISG standard defines the maximum spectrum emis-

sion that all the OOK modulating devices must be compli-

ant with. Such a spectrum is represented in Figure 3.

The MAX9947 is compliant with the AISG standard.

An external 470pF capacitor connected between RXIN

and ground is recommended for compliance above

25MHz (see the Typical Application Circuit (Connectivity

at the Base) and Typical Application Circuit (Connectivity

at the Tower)).

www.maximintegrated.com

Maxim Integrated │ 11

Share Link: