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Hello, Please ask a question about RF2489 Datasheet
# Example questions:
➢ What is the approximate total current consumption when using the gps receiver with the lna on and the mixer on?
➢ What are the key differences in total current consumption between the 'lna on, mixer preamp on' and 'lna off, mixer preamp off' scenarios for fm signals?
➢ How does changing the lna bias setting (ipset=0 vs. ipset=1) impact the input ip3 (dbm) for pcs cdma signals?
1. Current Consumption (Important Notes):
️· Base Current: All IDC (Instant DC) current numbers include a base circuitry current of 3.5mA.
️· TX Buffer: Adding the TX Buffer increases current by 2mA.
️· /2 Select: Enabling the /2 Select function adds another 2mA.
2. Current Consumption (Specific Configurations):
️· Cell CDMA:
- LNA ON, Mixer Preamp ON: 27.5 mA
- LNA ON, Mixer Preamp OFF: 23.0 mA
- LNA OFF, Mixer Preamp ON: 23.0 mA
- LNA OFF, Mixer Preamp OFF: 18.5 mA
️· FM: Same current consumption as Cell CDMA (27.5, 23.0, 23.0, 18.5 mA)
️· PCS CDMA:
- LNA ON, Max IIP3, Mixer ON: 29.5 mA
- LNA ON, Max IIP3, Mixer OFF: 25.0 mA
- LNA ON, Min IIP3, Mixer ON: 27.5 mA
- LNA ON, Min IIP3, Mixer OFF: 23.0 mA
- LNA OFF, Mixer ON: 23.0 mA
- LNA OFF, Mixer OFF: 18.5 mA
️· GPS: 26.0 mA
3. Performance Metrics (Typical Values):
The document also provides typical performance metrics like Gain, Noise Figure, and Input IP3 for each standard in different configurations. Here's a condensed overview, focusing on the *best* (highest Gain, lowest Noise Figure, highest Input IP3) values:
| Standard | Gain (dB) | Noise Figure (dB) | Input IP3 (dBm) |
|---|---|---|---|
| Cell CDMA | 25.0 | 2.1 | -7.8 |
| FM | 24.5 | 2.1 | -6.6 |
| PCS CDMA | 26.5 | 2.2 | -9.1 |
| GPS | 32.5 | 1.7 | -15.4 |
1. Current Consumption (Important Notes):
️· Base Current: All IDC (Instant DC) current numbers include a base circuitry current of 3.5mA.
️· TX Buffer: Adding the TX Buffer increases current by 2mA.
️· /2 Select: Enabling the /2 Select function adds another 2mA.
2. Current Consumption (Specific Configurations):
️· Cell CDMA:
- LNA ON, Mixer Preamp ON: 27.5 mA
- LNA ON, Mixer Preamp OFF: 23.0 mA
- LNA OFF, Mixer Preamp ON: 23.0 mA
- LNA OFF, Mixer Preamp OFF: 18.5 mA
️· FM: Same current consumption as Cell CDMA (27.5, 23.0, 23.0, 18.5 mA)
️· PCS CDMA:
- LNA ON, Max IIP3, Mixer ON: 29.5 mA
- LNA ON, Max IIP3, Mixer OFF: 25.0 mA
- LNA ON, Min IIP3, Mixer ON: 27.5 mA
- LNA ON, Min IIP3, Mixer OFF: 23.0 mA
- LNA OFF, Mixer ON: 23.0 mA
- LNA OFF, Mixer OFF: 18.5 mA
️· GPS: 26.0 mA
3. Performance Metrics (Typical Values):
The document also provides typical performance metrics like Gain, Noise Figure, and Input IP3 for each standard in different configurations. Here's a condensed overview, focusing on the *best* (highest Gain, lowest Noise Figure, highest Input IP3) values:
| Standard | Gain (dB) | Noise Figure (dB) | Input IP3 (dBm) |
|---|---|---|---|
| Cell CDMA | 25.0 | 2.1 | -7.8 |
| FM | 24.5 | 2.1 | -6.6 |
| PCS CDMA | 26.5 | 2.2 | -9.1 |
| GPS | 32.5 | 1.7 | -15.4 |
| Part No. | RF2489 |
| Manufacturer | RFMD |
| Size | 797 Kbytes |
| Pages | 30 pages |
| Description | DUAL-BAND/TRI-MODE CDMA LOW NOISE AMPLIFIER/MIXER |
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