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Teilenummer | MT1530 |
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Beschreibung | UPSTREAM AMPLIFIER | |
Hersteller | ETC | |
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Gesamt 14 Seiten www.DataSheet4U.com
M I C R O T U N E™
MT1530 UPSTREAM AMPLIFIER
ADVANCE DATA SHEET
CATV APPLICATIONS
1 APPLICATIONS
• Cable modems
• Telephony over cable
• Set-top box CATV
2 FEATURES
• Lowest power consumption upstream amplifier available
• Maximum output level of 64 dBmV
• Low power-up/down transients of 4 mVp-p typical at 59 dBmV output
• Best in class second harmonic distortion
• Ultra low third harmonic distortion
• Single +5V supply
• 63-dB Gain range
• Gain programmable in 1-dB steps
• Low transmit output noise floor: 131 nV / √Hz
• Low transmit-disable output noise: 810 pV / √Hz
• Two power-down modes
• DOCSIS and EuroDOCSIS compatible
3 OVERVIEW
The Microtune 1530 (MT1530) is a low-cost programmable-gain power amplifier IC
for use in CATV upstream applications. Specifically, the MT1530 is optimized for the
DOCSIS upstream standard.
The device operates at a frequency range from 5 MHz to 65 MHz, and can output
64 dBmV through a 4:1 impedance-ratio transformer. Second harmonic distortion is
typically less than -70 dBc, and third harmonic distortion is typically less than
-55 dBc at a 59 dBmV output level. A 3-wire digital serial bus controls the variable
gain, with gain control available in 1-dB steps and a nominal 63-dB gain range.
The MT1530 may be disabled via an external control pin. The transmit-disable mode
not only minimizes output noise by shutting off the output stage, but also maintains
its output impedance at nominal levels. Output glitch transients are nominally less
than 4 mV at maximum gain settings during transmit enable/disable switching.
Operating from a single +5V supply, the amplifier’s typical current draw at maximum
gain, or minimum attenuation, is 102 mA. Additionally, internal circuitry reduces the
amplifier’s power consumption depending on gain setting. Transmit-disable mode
power supply current is reduced to a nominal of 14 mA. A shutdown mode further
reduces current to a nominal of 130 µA.
The MT1530 is available in a 20-pin SSOP package for the extended industrial
temperature range of -40°C to +85°C.
DS-00010
Rev 1.2 — December 2000
Page 1 of 14
MT1530 UPSTREAM AMPLIFIER
ADVANCE DATA SHEET
CATV APPLICATIONS
8 DETAILED DESCRIPTION
This section describes the MT1530 functional blocks shown in Figure 12.
5 Vin+
Input Amp
Variable Attenuator
Power Amp
6 Vin-
Serial
Interface
PA
Control
Vout+ 16
Vcm 14
Vout- 15
CEXT
Figure 12 MT1530 Amplifier Block Diagram
8.1 FUNCTIONAL MODES
The MT1530 amplifier has three functional modes controlled through the serial
interface or external pins: transmit mode, transmit-disable mode, and shutdown
mode.
8.1.1 TRANSMIT MODE
Transmit mode is the normal active mode of the MT1530. The TXEN and SHDN pins
must be held high in this mode.
8.1.2 TRANSMIT-DISABLE 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.
DS-00010
Rev 1.2 — December 2000
Page 6 of 14
6 Page MT1530 UPSTREAM AMPLIFIER
ADVANCE DATA SHEET
10 PIN CONFIGURATION
Top View
GND
VCC1
NC
GND1
VIN+
VIN-
DGND
CS
SDA
SCLK
1
2
3
4
5
6
7
8
9
10
MT1530
Figure 14 Pin Diagram
20 GND2
19 VCC2
18 TXEN
17 NC
16 VOUT+
15 VOUT-
14 VCM
13 NC
12 SHDN
11 NC
CATV APPLICATIONS
DS-00010
Rev 1.2 — December 2000
Page 12 of 14
12 Page | ||
Seiten | Gesamt 14 Seiten | |
PDF Download | [ MT1530 Schematic.PDF ] |
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