U2793B ATMEL | Alldatasheet
Document overview
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Technical content
Features
Supply Voltage: 5 V Low Power Consumption: 15 mA/5 V Output Level and Spurious Products Adjustable (Optional) Excellent Sideband Suppression by Means of Duty Cycle Regeneration of the LO Input Signal Phase-control Loop for Precise 90° Phase Shifting Power-down Mode Low LO Input Level: -15 dBm 50-Ω Single-ended LO and RF Port LO Frequency Range of 30 MHz to 300 MHz Benefits Low Current Consumption Few External Components Result in Cost and Board Space Saving Adjustment Free Hence Saves Time Electrostatic sensitive device. Observe precautions for handling.
Description
The IC U2793B is a 300-MHz quadrature modulator that uses Atmel‘s advanced UHF process. It features low current consumption, single-ended RF ports and adjustment- free application, which makes the device suitable for all digital radio systems, e.g., GSM, PCN, JDC and WLAN. As an option, output level and spurious products are adjustable at pins 19 and 20. In conjunction with Atmel’s U2795B mixer, an up-con- verter up to 2 GHz can be realized. Figure 1. Block Diagram
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Figure 2. Pinning SSO20
4651C–CELL–07/04 Pin Description Pin Symbol Function
1 PU Power-up input
2 ACGND AC ground
3 GND Ground
4 RFO RF output
5 ACGND AC ground
6 VS Supply voltage
7 VS Supply voltage
8 SPU Settling time power-up
9 BBAI Baseband input A
10 BBAI Baseband input A inverse
11 BBBI Baseband input B
12 BBBI Baseband input B inverse
13 VREF Reference voltage (2.5 V)
14 LOI Input LO
15 LOI Input LO inverse, typically grounded
16 GND Ground
17 GND Ground
18 GND Ground
19 LP2 Output low pass and power control
20 LP1 Output low pass and power control
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4651C–CELL–07/04 Absolute Maximum Ratings Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Symbol Value Unit Supply voltage V S 6V Input voltage V i 0 to VS V Junction temperature T j 125 °C Storage temperature range T Stg -40 to +125 °C Thermal Resistance Parameters Symbol Value Unit Junction ambient SSO20 R thJA 140 K/W Operating Range Parameters Symbol Value Unit Supply voltage V S 4.5 to 5.5 V Ambient temperature range T amb -40 to +85 °C
Electrical Characteristics
Test conditions (unless otherwise specified); VS = 5 V , Tamb = 25°C, referred to test circuit. System impedance Zo = 50 Ω, fLO =150 MHz, PLO = -15 dBm, VBBi = 1.0 Vpp, differential No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type* 1.1 Supply voltage range 6, 7 V S 4.5 5 5.5 V A
1.2 Supply current 6, 7 I S 15 mA A
2 Baseband Inputs, Pin 9-10, 11-12
2.1 Input-voltage range
(differential) VBBi 1000 1500 mVpp D
2.2 Input impedance Z BBi 30 k Ω D
2.3 Input-frequency range f BBi 05 0 M H z D
3 LO Input, Pins 14 and 15
3.1 Frequency range f LOi 30 300 MHz D
3.2 Input level (1) PLOi -15 -5 dBm D
3.3 Input impedance Z iLO
(2) Ω D 3.4 Voltage standing wave ratio VSWR LO 3.5 D 3.5 Duty-cycle range DCR LO 0.4 0.6 D Notes: 1. Required LO level is a function of the LO frequency. 2. The LO input impedance is consisting of a 50 Ω resistor in series with a 15 pF capacitor. 3. With the pins 19 and 20 spurious performance especially for low frequency application can be improved by adding a chip capacitor between LP1 and LP2. In conjunction with a parallel resistor the output level can be adjusted to the following mixer stage without degration of LO suppression and noise performance which would decrease if the I/Q input level is reduced 4. For T amb = -40°C to +85°C and VS = 4.5 V to 5.5 V
4651C–CELL–07/04
4 RF Output, Pin 4
4.1 Output level
fLO = 150 MHz, VBBi = 1 Vpp, differential fLO = 50 MHz, VBBi = 0.3 Vpp, differential PRFo - 3 -1 dBm A/B
4.2 LO suppression P LO = -20 dBM LO RFO 32 45 dB A
4.3 Voltage standing wave ratio VSWR RF 1.4 2 D
4.4 Sideband suppression (3) SBSRFo 35 45 dB A
4.5 Phase error (4) Pe < 1 deg D
4.6 Amplitude error Ae < ±0.25 dB D
4.7 Noise floor VBBi = 2 V, VBBi = 3 V
VBBi = VBBi = 2.5 V NFL -137 -143 dBm/Hz D
5 Power-up Mode
5.1 Supply current VPU ≤ 0.5 V, pins 6, 7 VPU = 1 V IPU 10 1µ A D
5.2 Settling time Pins 1 to 4, CSPU = 100 pF
CLO = 100 pF , CRFo = 1 nF tSPU 10 µs D
6 Switching Voltage, Pin 1
6.1 Power on V PUON 4V D
7 Reference Voltage, Pin 13
7.1 Voltage range V Ref 2.375 2.5 2.625 V A
7.2 Output impedance Zo Ref 30 Ω D
Electrical Characteristics (Continued) Test conditions (unless otherwise specified); VS = 5 V , Tamb = 25°C, referred to test circuit. System impedance Zo = 50 Ω, fLO =150 MHz, PLO = -15 dBm, VBBi = 1.0 Vpp, differential (Continued) No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type* Notes: 1. Required LO level is a function of the LO frequency. 2. The LO input impedance is consisting of a 50 Ω resistor in series with a 15 pF capacitor. 3. With the pins 19 and 20 spurious performance especially for low frequency application can be improved by adding a chip capacitor between LP1 and LP2. In conjunction with a parallel resistor the output level can be adjusted to the following mixer stage without degration of LO suppression and noise performance which would decrease if the I/Q input level is reduced 4. For T amb = -40°C to +85°C and VS = 4.5 V to 5.5 V
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Figure 3. Reference Voltage versus Tamb Figure 4. OIP3 versus Tamb, LO = 150 MHz, Level -10 dBm Figure 5. Supply Current versus Tamb
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Figure 9. Typical Required VBBi Input Signal (Differential) versus LO Frequency Figure 10. Evaluation Board Circuitry
Figure 11. PCB Layout Evaluation Board
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Application Circuits Bias network for AC-coupled baseband inputs (VBA, VBB). Figure 12. Application Circuit with AC-coupled Baseband Inputs Figure 13. Application Circuit with DC-coupled Baseband Inputs
4651C–CELL–07/04
Package Information
Ordering Information
Extended Type Number Package Remarks U2793B-MFS SSO20 Tube U2793B-MFSG3 SSO20 Taped and reeled U2793B-NFSH SSO20 Tube, lead free U2793B-NFSG3H SSO20 Taped and reeled, lead free
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