 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| U2794B 1000-MHz Quadrature Demodulator Description The U2794B silicon monolithic integrated circuit is a quadrature demodulator which is manufactured using Atmel Wireless & Microcontrollers' advanced UHF technology. This demodulator features a frequency range from 70 MHz to 1000 MHz, low current consumption, selectable gain, power-down mode and adjustment-free handling. The IC is suitable for direct conversion and image rejection applications in digital radio systems up to 1 GHz such as cellular radios, cordless telephones, cable TV and satellite TV systems. Electrostatic sensitive device. Observe precautions for handling. D Low LO input level -10 dBm (typ.) D LO frequency from 70 MHz to 1 GHz D Power-down mode D 25 dB gain control D Very low I/Q output DC offset voltage typ. < 5 mV Features D Supply voltage 5 V (typ.) D Very low power consumption 125 mW (typ.) D Very good image rejection by means of phase control loop for precise 90 phase shifting D Duty-cycle regeneration for single ended LO input signal Block Diagram VS 5,6 PD 14 IIX 4 II 3 1 2 IX OUTPUT I Power down RFin 7 8 90Control loop 0 90 Frequency doubler Duty cycle regenerator 15 17 13 12 19 20 LO PC PCX QX OUTPUT Q 11 16,18 10 9 GC GND QQX 95 9778 Figure 1. Block diagram Ordering Information Extended Type Number U2794B-MFS U2794B-MFSG3 Package SSO20 SSO20 Remarks Tube, MOQ 830 pcs. Taped and reeled, MOQ 4000 pcs. Rev. A5, 10-Oct-00 1 (10) U2794B Pin Description IX I II IIX VS VS RFin RFXin QQ QQX 1 2 3 4 5 6 7 8 9 10 95 10711 20 Q 19 QX 18 17 GND LOin Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Symbol IX I II IIX VS VS RFin RFXin QQ QQX GC PCX PC PD LOXin GND LOin GND QX Q IX output I output Function II lowpass filter I IIX lowpass filter I Supply voltage Supply voltage RF input RFX input QQ lowpass filter Q QQX lowpass filter Q GC gain control PCX phase control PC phase control PD power down LOX input Ground LO input Ground QX output Q output 16 GND 15 LOXin 14 PD 13 PC 12 PCX 11 GC Figure 2. Pinning Absolute Maximum Ratings Parameters Supply voltage Input voltage Junction temperature Storage-temperature range Pins 5 and 6 Pins 7, 8 and 17 Symbol VS Vi Tj Tstg Value 6 0 to VS 125 -40 to 125 Unit V V C C Operating Range Parameters Supply-voltage range Ambient-temperature range Pins 5 and 6 Symbol VS Tamb Value 4.75 to 5.25 -40 to 85 Unit V C Thermal Resistance Parameters Junction ambient SSO 20 Symbol RthJA Value 140 Unit K/W 2 (10) Rev. A5, 10-Oct-00 U2794B Electrical Characteristics Test conditions (unless otherwise specified); VS = 5 V, Tamb = 25C, referred to test circuit System impedance ZO = 50 W, fiLO = 950 MHz, PiLO = -10 dBm Parameters Supply-voltage range Supply current Power-down mode, PD "OFF"mode supply current Switch voltage "Power ON" "Power DOWN" LO input, LOin Frequency range Input level Input impedance Voltage standing wave ratio Duty-cycle range RF input, RFin Noise figure (DSB) symmetrical output Frequency range -1 dB input compression point Second order IIP Third order IIP High gain Low gain LO leakage Pins 7 and 8 Symmetric input Asymmetric input Pins 7 and 8 see figure 11 Note 1: During power-down status a load circuitry with DC-isolation to GND is assumed, otherwise a current of I (VS -0.8 V) /RI has to be added to the above power-down current for each output I, IX, Q, QX. Note 2: The required LO-Level is a function of the LO frequency (see figure 7). Note 3: Measured with input matching. For 950 MHz, the optional transmission line T3 at the RF input may be used for this purpose. Noise figure measurements without using the differential output signal result in a worse noise figure. Note 4: Using Pins 7 and 8 as a symmetric RF input, the second-order IIP can be improved. High gain Low gain Note 4 Pins 7 and 8 Pins 7 and 8 IIP3HG IIP3LG LOL ZiRF +3 +13 -60 -55 500o0.8 dBm @ 950 MHz Note 3 @ 100 MHz Pins 7 and 8 Pins 7 and 8 Pins 7 and 8 ICPHG ICPLG IIP2HG -8 +3.5 35 dBm dBm NF fiRF 12 10 >fiLO dB Note 2 See figure 11 See figure 4 Pin 17 fiLO PiLO ZiLO VSWRLO LODCR 0.4 70 -12 -10 50 1.2 2 0.6 1000 -5 MHz dBm W VPD 0.5 V VPD = 1.0 V Note 1 Pins 5 and 6 Pin 14 Pin 14 VPON VPOFF 4 1 V V IsPD 1 20 mA Test Conditions / Pins Pins 5 and 6 Pins 5 and 6 Symbol VS IS Min. 4.75 30 Typ. Max. 5.25 Unit V mA dBm WopF Input impedance Rev. A5, 10-Oct-00 3 (10) U2794B Electrical Characteristics (continued) Test conditions (unless otherwise specified); VS = 5 V, Tamb = 25C, referred to test circuit System impedance ZO = 50 W, fiLO = 950 MHz, PiLO = -10 dBm Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit I/O outputs (I, IX, Q, QX) Emitter follower I = 0.6 mA 3-dB bandwidth w/o external C I/Q amplitude error I/Q phase error I/Q maximum output swing DC output voltage DC output offset voltage Output impedance Gain control, GC Control range power gain, gain high/gain low Note 7 Switch voltage "Gain high" "Gain low" Settling time, ST Power "OFF" - "ON" Power "ON" - "OFF" STON STOFF <4 <4 ms ms Note 8 Pin 11 Pin 11 GCVHigh GCVLow 1 V V Pin 11 GCR PGH/GGL 25 23/-2 dB Note 6 Pins 1, 2, 19 and 20 Pins 1, 2, 19 and 20 see figure 11 Note 5 Pins 1, 2, 19 and 20 Pins 1, 2, 19 and 20 Pins 1, 2, 19 and 20 Pins 1, 2, 19 and 20 Symm. output RL > 5 kW Pins 1, 2, 19 and 20 BWI/Q AII/Q QEI/Q Max I/Q VOUT VOFSI/Q I/IX Q/QX Zout 2.8 <5 30 0.2 1.5 2 MHz dB Deg VPP V mV 50 W Note 5: Due to test board parasitics, this bandwidth is reduced and not equal for I, IX, Q, QX. If symmetry and full bandwidth is required, the lowpass Pins 3, 4 and 9, 10 should be isolated from the board. The bandwidth of the I/Q outputs can be increased further by using a resistor between Pins 3, 4, 9 and 10. These resistors shunt the internal loads of RI 5.4 kW The decrease in gain here has to be considered. Note 6: Output emitter follower internal, a current I = 0.6 mA allows only small voltage swing with a 50 W load. For low signal distortion the load impedance should be RI 5 kW Note 7: Referred to the level of the output vector I 2 ) Q 2. Note 8: The low-gain status is achieved with an open or high-ohmic Pin 11. A recommended application circuit for switching between high and low gain status is shown in figure 3. 4 (10) Rev. A5, 10-Oct-00 U2794B Test Circuit 95 9842 OUT 1 RD1 OUT 2 RD2 n.c. CUCC CLO CNLO CPDN 1n CRF CRFX CPC CNPC n.c. CGC * optional for single ended tests (notice 3 dB bandwidth of AD620) T1, T2 = transmission line ZO = 50 W. If no GC function is required, connect Pin 11 to GND. For high and low gain status GC' is to be switched to GND respectively to VS. Figure 3. 6 18 16 NF ( dB ) 50 250 450 650 850 1050 95 9856 5 VSWR 4 14 12 10 8 0 200 3 2 1 95 9919 LO Frequency ( MHz ) 400 600 800 LO frequency ( MHz ) 1000 Figure 4. Typical VSWR frequency response of the LO input Figure 5. Noise figure vs. LO frequency; o: value at 950 MHz with RF input matching with T3 Rev. A5, 10-Oct-00 5 (10) U2794B 0 -10 PLO ( dBm ) -20 PLOmin PLOmax 10 0 PLO ( dBm ) -10 -20 -30 -30 -40 -50 30 40 -40 -50 50 60 70 80 LO frequency ( MHz ) 90 95 10070 0 200 14190 400 600 800 LO frequency ( MHz ) 1000 Figure 6. Typical suitable LO power range vs. frequency 30 26 Figure 9. Typical suitable LO power range vs. frequency 1800 1600 1400 VI/Qout (mVpp) 1200 1000 800 600 400 200 Gain ( dB ) 22 18 14 10 0 200 95 10069 400 600 800 LO frequency ( MHz ) 1000 14192 0 -40 -35 -30 -25 -20 PRF ( dBm ) -15 -10 Figure 7. Gain vs. LO frequency; x: value at 950 MHz with RF input matching with T3 1600 1500 VI/Qout (mVpp) 1400 1300 1200 1100 1000 900 800 0 14191 Figure 10. Typical output voltage (single ended) vs. PRF at Tamb = 25C and PLO = -15 dBm 200 400 600 800 fLO ( MHz ) 1000 Figure 8. Typical output signal vs. LO frequency for PRF = -15 dBm and PLO = -15 dBm 6 (10) Rev. A5, 10-Oct-00 U2794B j 0.5j 2j 0.2j 5j 0 -0.2j 95 9977 Figure 11. Typical S11 frequency response of the a: LO input, LO frequency from 100 MHz to 1100 MHz, marker: 950 MHz b: RF input, RF frequency from 100 MHz to 1100 MHz, marker: 950 MHz c: I/Q outputs, baseband frequency from 5 MHz to 55 MHz, marker: 25 MHz Evaluation Board Layout Rev. A5, 10-Oct-00 A AA AAAA AA A AA AAAA AA 0.2 0.5 a1 c 2 5 b -5j -0.5j -j -2j 1 95 9854 Figure 12. 7 (10) U2794B Evaluation Board IX I Q QX VS GC PCVS PD GND GND 95 9853 Figure 13. External Components CUCC 100 nF CRFX 1 nF CLO 100 pF CNLO 1 nF CRF 100 pF CII, CQQ optional external lowpass filters T3 transmission line for RF-input matching, to connect optionally CI, CIX, optional for AC-coupling at CQ, CQX baseband outputs CPDN 100 pF - not connected CGC 100 pF CPC 100 pF - not connected CNPC 100 pF - not connected GSW gain switch Calibration Part CO, CS, CL 100 pF RL 50 W Conversion to Single Ended Output (see data sheet of AD620) OP1, OP2 RG1, RG2 AD620 prog. gain, see datasheet, for 5.6 kW a gain of 1 at 50 W is achieved together with RD1 and RD2. 450 W 100 nF 100 nF RD1, RD2 CS1, CS2 CS3, CS4, 8 (10) Rev. A5, 10-Oct-00 U2794B Description of the Evaluation Board Board material: epoxy; ar = 4.8, thickness = 0.5 mm transmission lines: ZO = 50 W - The LO- and the RF-inputs are AC-coupled and connected via SMB plugs. If transmission line T3 is connected to the RF-input and AC-grounded at the other end, gain and noise performance can be improved (input matching to 50 W). - The complementary RF-input is AC-coupled to GND (CRFX = 1 nF), the same appears to the complementary LO input (CNLO = 1 nF). D A calibration part which allows to calibrate an s-parameter analyzer directly to the in- and outputsignal ports of the U2794B. D For single-ended measurements at the demodulator outputs, two OPs (e.g., AD620 or other) can be configured with programmable gain; together with an output-divider network RD = 450 W to RL = 50 W, direct measurements with 50-W load impedances are possible at frequencies t 100 kHz. The board offers the following functions D The test circuit for the U2794B: - The supply voltage and the control inputs GC, PC and PD are connected via a plug strip. The control input voltages can be generated via external potentiometers; then the inputs should be AC-grounded (time requirements in burst mode for power up have to be considered). - The outputs I, IX, Q, QX are DC coupled via an plug strip or can be AC-connected via SMB plugs for high frequency tests e.g. noise figure or s-parameter measurement. The Pins II, IIX, QQ, QQX allow user-definable filtering with 2 external capacitors CII, CQQ. - The offsets of both channels can be adjusted with two potentimeters or resistors. Package Information Package SSO20 Dimensions in mm 6.75 6.50 5.7 5.3 4.5 4.3 1.30 0.25 0.65 5.85 20 11 0.15 0.05 0.15 6.6 6.3 technical drawings according to DIN specifications 13007 1 10 Rev. A5, 10-Oct-00 9 (10) U2794B Ozone Depleting Substances Policy Statement It is the policy of Atmel Germany GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (ODSs). The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. Atmel Germany GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency (EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively. Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. 3. We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use Atmel Wireless & Microcontrollers products for any unintended or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. Data sheets can also be retrieved from the Internet: http://www.atmel-wm.com Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423 10 (10) Rev. A5, 10-Oct-00 |
Price & Availability of U2794B
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |