MT1530 ETC, MT1530 Datasheet - Page 6

• Manufacturer Part Number: MT1530
• Description: Upstream Amplifier
• Manufacturer: ETC

MT1530 U
A
8 DETAILED DESCRIPTION
DVANCE
8.1 FUNCTIONAL MODES
D
ATA
PSTREAM
8.1.1 TRANSMIT MODE
8.1.2 TRANSMIT-DISABLE MODE
S
HEET
6
5
A
MPLIFIER
Vin-
Vin+
This section describes the MT1530 functional blocks shown in Figure 12.
Figure 12 MT1530 Amplifier Block Diagram
The MT1530 amplifier has three functional modes controlled through the serial
interface or external pins: transmit mode, transmit-disable mode, and shutdown
mode.
Transmit mode is the normal active mode of the MT1530. The TXEN and SHDN pins
must be held high in this mode.
Transmit-disable mode is typically used between bursts in TDMA systems. This
mode shuts off the power amplifier while keeping the input amplifier and variable
attenuator powered up. Taking TXEN low while keeping SHDN high and D7 = 1 (see
Table 5) activates this mode.
Input Amp
Variable Attenuator
Interface
Serial
Power Amp
Control
PA
Vout+
Rev 1.2 — December 2000
Vout-
Vcm
CATV A
16
14
15
Page 6 of 14
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