Description
Applications:
- TTL to LVDS Logic Level Translation
- Conversion of Single-Ended TTL Signals to Differential Signals for Driving Long Lines
- Mini Modular Instrument for interfacing with High Speed Data Communications Equipment
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Features:
- 250 MHz Typical Maximum Clock Rate
- 4 Single Ended Inputs with Selectable 50 Ω or 1 kΩ Termination
- 4 LVDS Outputs for Driving 50 Ohm or Cat 7 Cables into 100 Ω Floating Loads
- SMA or RJ45 I/O Connectors
- Single Supply, +7.5 VDC to +12 VDC, operation
- Ready-to-Use 1.3 x 2.9 x 2.9-in. Module includes a ±8.5 V/1.4 A AC/DC Adapter
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Description
The PRL-444LV is a 4 Channel TTL to LVDS translator module. The input resistance of the inputs can be selected to be either 50 Ω or 1 kΩ by a common toggle switch. The 1 kΩ inputs are desirable when interfacing with low power circuits. The four pairs of complementary outputs are designed for driving floating 100 Ω loads, normally the configuration used in LVDS input circuits. The output swing is typically 300 mV with a common mode voltage of 1.0 V.
All I/Os are DC coupled and have SMA or RJ45 connectors, as part numbers PRL-444LV-SMA and PRL-444LV-RJRJ, respectively. A block diagram showing the equivalent input and output circuits are shown in Figs. 1 and 2. Cat7 or better cabling is recommended for RJ45 models, as the double shielding improves the impedance control. See our case studies on single-ended impedance and differential impedance of standard, off-the-shelf network cabling.
The modules are housed in a 1.3 x 2.9 x 2.9-in. extruded aluminum enclosure and supplied with a ±8.5 V/±1.4 A, auto-switching AC/DC Adapter. Either model may also be ordered without the power supply by appending “-OEM” to the part number, e.g. PRL-444LV-SMA-OEM. A maximum of four units can share one PRL-760D-120/220 AC/DC adapter, using additional units of cable #88000102-4. If mounting is desired, a pair of the #35001420 mounting brackets can accommodate any two PRL modules of the same length. Please refer to the Accessories section for more detail.
A complementary product, the PRL-425QLT, performs the opposite conversion of 4 LVDS signals to 4 TTL signals, and the PRL-RJ45-SMA adapter can be used to adapt Cat7 network cabling to SMA or the reverse.
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Fig. 1: PRL-444LV-SMA Block Diagram
Fig. 2: PRL-444LV-RJRJ Block Diagram
SPECIFICATIONS: (0° C ≤ TA ≤ 35° C)*
| SYMBOL |
PARAMETER |
Min |
Typ |
Max |
UNIT |
Comment |
| RIN1 |
Input Resistance |
49.5 |
50.0 |
50.5 |
Ω |
|
| RIN2 |
Input Resistance |
990 |
1000 |
1010 |
V |
|
| VIL |
TTL input Low Level |
-0.5 |
0.0 |
0.5 |
V |
|
| VIH |
TTL input High Level |
2.0 |
2.4 |
5.0 |
V |
|
| VDC |
DC Input Voltage |
7.5 |
8.5 |
12.0 |
V |
|
| VAC1 |
AC/DC Adapter Input Voltage, 120 |
103 |
115 |
127 |
V |
|
| VAC1 |
AC/DC Adapter Input Voltage, 220 |
206 |
230 |
254 |
V |
|
| IDC1 |
DC Input Current @ 50 MHz |
|
65 |
85 |
mA |
|
| IDC2 |
DC Input Current @ 250 MHz |
|
|
125 |
mA |
|
| VOPP |
Output Differential Voltage, peak-to-peak |
250 |
300 |
450 |
mV |
|
| VCMO |
Output Common mode voltage1 |
|
1.0 |
1.2 |
V |
|
| tPLH |
Propagation Delay to output ↑ |
|
2 |
3 |
ns |
|
| tPHL |
Propagation Delay to output ↓ |
|
2 |
3 |
ns |
|
| tr/tf1 |
Rise/Fall Times (10%-90%)1 |
|
1.0 |
1.8 |
ns |
Note 1 |
| fMAX |
Max Clock Frequency |
200 |
250 |
|
MHz |
Note 1 |
| tSKEW |
Skew between any 2 outputs |
|
300 |
750 |
ps |
|
| DTY |
Duty Cycle @ 50 MHz |
|
45/55 |
|
|
|
| |
Size |
1.3 x 2.9 x 2.9 |
in. |
|
| |
Weight |
5 |
Oz |
|
| |
Shipping Weight |
3 |
lbs |
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1-SMA model only. fmax and tr/tf for RJ45 models are pending.
While we believe these models to be accurate, no representations are made as to accuracy or suitability for any application:
PRL-444LV-SMA:
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Fig. 1: PRL-444LV-SMA Block Diagram
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