Electronic Components Datasheet Search |
|
LT5504 Datasheet(PDF) 10 Page - Linear Technology |
|
LT5504 Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page LT5516 10 5516f APPLICATIO S I FOR ATIO I-Channel and Q-Channel Outputs Each of the I-channel and Q-channel outputs is internally connected to VCC though a 60Ω resistor. The output dc bias voltage is VCC – 0.68V. The outputs can be DC coupled or AC coupled to the external loads. The differential output impedance of the demodulator is 120 Ω in parallel with a 5pF internal capacitor, forming a lowpass filter with a –3dB corner frequency at 265MHz. RLOAD (the single- ended load resistance) should be larger than 600 Ω to assure full gain. The gain is reduced by 20 • log(1 + 120 Ω/ RLOAD) in dB when the differential output is terminated by RLOAD. For instance, the gain is reduced by 6.85dB when each output pin is connected to a 50 Ω load (100Ω differ- ential load). The output should be taken differentially (or by using differential-to-single-ended conversion) for best RF performance, including NF and IM2. The phase relationship between the I-channel output sig- nal and Q-channel output signal is fixed. When the LO input frequency is larger (or smaller) than the RF input frequency, the Q-channel outputs (QOUT+, QOUT–) lead (or lag) I-channel outputs (IOUT+, IOUT–) by 90°. When AC output coupling is used, the resulting highpass filter’s –3dB roll-off frequency is defined by the R-C constant of the blocking capacitor and RLOAD, assuming RLOAD > 600Ω. Care should be taken when the demodulator’s outputs are DC coupled to the external load, to make sure that the I/Q mixers are biased properly. If the current drain from the outputs exceeds 6mA, there can be significant degrada- tion of the linearity performance. Each output can sink no more than 13mA when the outputs are connected to an external load with a DC voltage higher than VCC – 0.68V. The I/Q output equivalent circuit is shown in Figure 7. 3 2 RF J1 T1 LDB31900M20C-416 VCC RF+ LT5516 RF– 5516 F05 1k 1.54V 1.54V L1 33nH 6 2 4 1 3 C1 1nF Figure 5. RF Input Equivalent Circuit with External Matching |
Similar Part No. - LT5504 |
|
Similar Description - LT5504 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |