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PDF ZX76-31R75PP Data sheet ( Hoja de datos )
| Número de pieza | ZX76-31R75PP | |
| Descripción | Digital Step Attenuator | |
| Fabricantes | Mini-Circuits | |
| Logotipo |  |
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DWidige bitaandl Step Attenuator
ZX76-31R75PP+
50Ω 0 to 31.75 dB, 0.25 dB Step 9 kHz to 6.0 GHz
7 Bit, Parallel control interface, Single Supply Voltage
The Big Deal
• Wideband, operates up to 6 GHz
• Immune to latchup
• High IP3, 53 dBm
• Control inputs buffered by Schmitt Triggers
CASE STYLE: HK1172
Product Overview
The ZX76-31R75PP+ is a 50Ω digital step attenuator model which provides adjustable attenuation from 0
to 31.75 dB in 0.25 dB steps. The control is a 7-bit parallel interface, with a single positive supply voltage.
Control lines are buffered by Schmitt Triggers to allow a wide range of control voltage levels. The model
is produced using a unique unibody case package for ruggedness and operation in tough environments.
Key Features
Feature
Wideband operation, specified from 9
kHz to 6.0 GHz
Parallel control interface with wide
control voltage range
Good VSWR, 1.3:1 typ.
Glitch-less attenuation transitions
Single positive supply
Power Supply 3.0 to 5.5 V
Advantages
Can be used in multiple applications such as communications, satellite and defense,
reducing part count.
Uses a simple parallel control interface with no clock required and can accept
commands with ‘1’ from 1.17V to 5V making it suitable for a wide range of applications.
Eases interfacing with adjacent components and results in low amplitude ripple.
The ZX76-31R75PP+ employs novel architecture to reduce the RF output power spikes
during attenuation transition to 0.3 dB Typ thus reducing noise in the system and
eliminating the risk of a transient spike damaging sensitive components in the system.
Use of single positive supply simplifies power supply design. An internal negative voltage
generator supplies the desired negative voltage. Single positive supply results in excellent
spurious performance, -110 dBm typical.
Model suitable for both 5V and 3.3V systems applications with no voltage dividers or
multipliers needed.
Mini-Circuits®
www.minicircuits.com P.O. Box 350166, Brooklyn, NY 11235-0003 (718) 934-4500 [email protected]
Page 1 of 7
1 page  
Digital Step Attenuator
Simplified Schematic
ZX76-31R75PP+
RF Input
16
8
4
2 1 0.5 0.25 RF Out
dB dB dB dB dB dB dB
Parallel Control
Latch Enable
Internal Control Logic Interface
The ZX76-31R75PP+ parallel interface consists of 7 control bits that select the desired attenuation state,
as shown in Table 1: Truth Table
Table 1. Truth Table
Attenuation
State
C16
C8
C4
C2
C1 C0.5
Reference
0
0
0
0
0
0
0.25 (dB) 0 0 0 0 0 0
0.5 (dB)
000001
1 (dB)
000010
2 (dB)
000100
4 (dB)
001000
8 (dB)
010000
16 (dB)
100000
31.75 (dB)
1
1
1
1
1
1
Note: Not all 128 possible combinations of C0.25 - C16 are shown in table
C0.25
0
1
0
0
0
0
0
0
1
The parallel interface timing requirements are defined by Figure 1 (Parallel Interface Timing Diagram) and
Table 2 (Parallel Interface AC Characteristics), and switching speed.
For latched parallel programming the Latch Enable (LE) should be held LOW while changing attenuation
state control values, then pulse LE HIGH to LOW (per Figure 1) to latch new attenuation state into device.
For direct parallel programming, the Latch Enable (LE) line should be pulled HIGH. Changing attenuation
state control values will change device state to new attenuation. Direct mode is ideal for manual control of
the device (using hardwire, switches, or jumpers).
Figure 1: Parallel Interface Timing Diagram
LE
Parallel Data
C16:C0.5
Table 2. Parallel Interface AC Characteristics
Symbol
tLEPW
tPDSUP
tPDHLD
Parameter
LE minimum pulse width
Data set-up time before
clock rising edge of LE
Data hold time
after clock falling edge of LE
Min.
10
10
10
Units
ns
ns
ns
tPDSUP
tLEPW
tPDHLD
Power-up State
When the attenuator powers up and LE is logic low, the nominal attenuation is set on 0 dB. When LE is logic high,
the nominal attenuation selected upon control logics ( see Table 1 ).
Mini-Circuits®
www.minicircuits.com P.O. Box 350166, Brooklyn, NY 11235-0003 (718) 934-4500 [email protected]
Page 5 of 7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet ZX76-31R75PP.PDF ] | |
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