VIAVI LTE-Lite Frequency and Timing SMT GPSDO Module
Low-cost SMT GPS-disciplined oscillator module providing GNSS time and frequency synchronization for LTE small cells.
- 1 PPS Timing Accuracy from GPS Receiver
- <8 ns to UTC RMS (1-Sigma)
- Holdover Stability (1 week with GPS)
- <±50 µs over 3 hour period @+25°C
- 1 PPS Output
- 3.3 V DC CMOS
- Serial Port
- TTL Level, GPS NMEA Output with 1 Hz or 5 Hz update rate
Overview
The LTE-Lite Frequency and Timing SMT module integrates a GPS receiver, filtered power supplies and a software-disciplined crystal oscillator into a 0.7 x 1.18 inch GPSDO surface-mount module. It uses analog crystal disciplining to achieve low phase noise and jitter.
The module provides GNSS time and frequency synchronization for cost-sensitive network equipment, in particular LTE 4G applications and small cell products ranging from micro cells to femto cells. When locked to GPS, the unit typically achieves a frequency accuracy of 1 ppb or better; in free-running mode or when not locked to GPS, frequency stability is 100 ppb over temperature. For optimal performance the unit should be shielded from airflow.
NMEA output and status
The LTE-Lite outputs all standard NMEA messages at 1 Hz or 5 Hz. The 5 Hz NMEA messaging supports precise positioning in UAV and other mobile applications. A proprietary NMEA message reports oscillator lock status and health information, and the same information is mirrored on TTL status outputs for applications without a serial interface.
Evaluation kit
The LTE-Lite SMT module is also available as an evaluation kit that includes the accessories needed to operate the unit. GPSCon Controller Software and JLTerm Software are available for download.
Key Features
- SMT package, 0.7 x 1.2 x 0.1 inches
- Telecom frequencies: 10, 15.36, 20 MHz
- Internal 65 channel GPS and TCXO
- 3.3 V operation, very low power consumption, and TTL strap configuration
- Two independent frequency outputs (one synthesized)
- Support for disciplining external oscillators including CSAC
- Full NMEA output with 1 Hz and 5 Hz PVT update rates
- Proprietary NMEA oscillator lock status message
- Typical frequency accuracy of 1 ppb or better when locked to GPS
- Frequency stability of 100 ppb over temperature when free-running or not locked to GPS
- True analog crystal disciplining for low phase noise and jitter
- Firmware field-upgradable
Specifications
| 1 PPS Timing Accuracy from GPS Receiver |
<8 ns to UTC RMS (1-Sigma)
GPS Locked
|
|---|---|
| Holdover Stability (1 week with GPS) |
<±50 µs over 3 hour period @+25°C
No Motion, No Airflow
|
| 1 PPS Output | 3.3 V DC CMOS |
| Serial Port | TTL Level, GPS NMEA Output with 1 Hz or 5 Hz update rate |
| TTL Alarm Output | GPS LOCK indicator, ALARM output, Survey status, Warmup status |
| Warm Up Time / Stabilization Time | <10 min at +25°C to better than 1E-09 Accuracy |
| Additional Features | Firmware field-upgradable, status LED, external oscillator option |
| GPS Frequency | L1, C/A 1574 MHz |
|---|---|
| GPS Antenna | Active or Passive (0 dB to +30 dB gain) |
| GPS Receiver |
65 Channels, QZSS, SBAS WAAS, EGNOS, MSAS capable
Supports Position and Hold over-determined clock mode
|
| Sensitivity, Acquisition | -148 dBm |
| Sensitivity, Tracking | -165 dBm |
| GPS TTFF, Cold Start | <32 sec |
| GPS TTFF, Warm Start | 1 sec |
| GPS TTFF, Hot Start | 1 sec |
| ADEV, 10 s | <7E-011 |
|---|---|
| ADEV, 10 Ks |
<2E-012
GPS Locked, 25°C, no motion, no airflow
|
|
Frequency Output of Low Phase Noise Crystal
10 MHz variant
|
10 MHz CMOS 3 Vpp |
|---|---|
|
Frequency Output of Low Phase Noise Crystal
20 MHz variant
|
20 MHz CMOS 3 Vpp |
|
Secondary Synthesized CMOS Output
10 MHz variant
|
80 MHz/40 MHz/26.666 MHz/20/16 MHz/13.333 MHz/5 MHz
Phase-Locked to 10 MHz
|
|
Secondary Synthesized CMOS Output
20 MHz variant
|
80 MHz/40 MHz/26.666 MHz/16 MHz/13.333 MHz/10 MHz/5 MHz
Phase-Locked to 20 MHz
|
| Retrace | ±2E-08 After 1 Hour @ +25°C without GPS |
| Frequency Stability Over Temperature |
±0.1 ppm
Internal TCXO without GPS, 0°C to +60°C
|
| RF Output Amplitude | 3 Vpp CMOS |
| Phase Jitter |
<0.135 ps rms
100 Hz to 10 MHz
|
|
1 Hz
10 MHz variant
|
-69 dBc/Hz
Datasheet heading: Phase Noise (at 20 MHz)
|
|---|---|
|
1 Hz
20 MHz variant
|
-65 dBc/Hz
Datasheet heading: Phase Noise (at 20 MHz)
|
|
10 Hz
10 MHz variant
|
-96 dBc/Hz |
|
10 Hz
20 MHz variant
|
-92 dBc/Hz |
|
100 Hz
10 MHz variant
|
-119 dBc/Hz |
|
100 Hz
20 MHz variant
|
-116 dBc/Hz |
|
1 kHz
10 MHz variant
|
-138 dBc/Hz |
|
1 kHz
20 MHz variant
|
-136 dBc/Hz |
|
10 kHz
10 MHz variant
|
-150 dBc/Hz |
|
10 kHz
20 MHz variant
|
-148 dBc/Hz |
|
100 kHz
10 MHz variant, 20 MHz variant
|
<-155 dBc/Hz |
|
FREQ_SEL 111
10 MHz TCXO, 15.36 MHz TCXO, 19.2 MHz TCXO, 20 MHz TCXO
|
disabled |
|---|---|
| FREQ_SEL 110 |
5 MHz / 4.608 MHz / 4.8 MHz / 5 MHz
10 MHz / 15.36 MHz / 19.2 MHz / 20 MHz TCXO
|
| FREQ_SEL 101 |
13.33333333 MHz / 10.24 MHz / 9.6 MHz / 10 MHz
10 MHz / 15.36 MHz / 19.2 MHz / 20 MHz TCXO
|
| FREQ_SEL 100 |
16 MHz / 15.36 MHz / 12.8 MHz / 13.33333333 MHz
10 MHz / 15.36 MHz / 19.2 MHz / 20 MHz TCXO
|
| FREQ_SEL 011 |
20 MHz / 23.04 MHz / 15.36 MHz / 16 MHz
10 MHz / 15.36 MHz / 19.2 MHz / 20 MHz TCXO
|
| FREQ_SEL 010 |
26.66666667 MHz / 30.72 MHz / 25.6 MHz / 26.66666667 MHz
10 MHz / 15.36 MHz / 19.2 MHz / 20 MHz TCXO
|
| FREQ_SEL 001 |
40 MHz / 46.08 MHz / 38.4 MHz / 40 MHz
10 MHz / 15.36 MHz / 19.2 MHz / 20 MHz TCXO
|
| FREQ_SEL 000 |
80 MHz / 92.16 MHz / 76.8 MHz / 80 MHz
10 MHz / 15.36 MHz / 19.2 MHz / 20 MHz TCXO
|
| Connections | 1 PPS Output (2x), 19.2 MHz Output, power, system status, NMEA, ISP mode enable, antenna input, Synthesized reference frequency output |
|---|---|
| Connector Type | SMT module with 50 mils (1.27 mm) pin spacing, U.FL RF antenna |
| Supply Voltage (Vdd) | 3.3 V Single-Supply, +0.2 V/-0.15 V |
|---|---|
| Power Consumption | <0.16 W |
| Operating Temperature | -10°C to +70°C, -40°C to +85°C optional |
| Dimensions |
0.7 x 1.2 x 0.1 inches
Overview text states 0.7 x 1.18 inch module footprint
|
|---|
Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.
Applications
- LTE 4G network equipment
- Small cells from micro cells to femto cells
- UAV and mobile positioning
- Defense
- 5G communications
- SATCOM
- Transportation
- Data center
- Energy
- Financial
- Critical infrastructure
Options & Accessories
| Option | Description |
|---|---|
| 100407-G2 | LTE Lite Module 10MHz - RoHS |
| 100421-G2 | LTE Lite Module 15.36MHz – RoHS |
| 100402-G2 | LTE Lite Module 20MHz - RoHS |
| 100406 | LTE Evaluation Kit 10MHz - RoHS — Contains LTE Lite Module, MMCX R/A Plug to BNC STR Cable, USB 1.83m USB 2.0 Type A to Mini USB 2.0 Type B Cable Assembly, USB Power Adapter 5Vdc, GPS Antenna 10M Cable Magnetic Mount BNC, CB Assy LTE Lite Evaluation PCBA r 1.4, DIP Socket SKT 14 POS 15.24mm Solder ST Thru-Hole Connector, Unshrouded Header HDR 36 POS 2.54mm Solder ST Top Entry Thru-Hole Connector |
| 100404 | LTE Evaluation Kit 20MHz - RoHS — Contains LTE Lite Module, MMCX R/A Plug to BNC STR Cable, USB 1.83m USB 2.0 Type A to Mini USB 2.0 Type B Cable Assembly, USB Power Adapter 5Vdc, GPS Antenna 10M Cable Magnetic Mount BNC, CB Assy LTE Lite Evaluation PCBA r 1.4, DIP Socket SKT 14 POS 15.24mm Solder ST Thru-Hole Connector, Unshrouded Header HDR 36 POS 2.54mm Solder ST Top Entry Thru-Hole Connector |