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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- 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
300-MHz Quadrature Modulator U2793B
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 adjustmentfree 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-converter up to 2 GHz can be realized. Figure 1. Block Diagram
SPD BBAi BBAi 10 9 8 PU 1
LOi LOi
14 Duty cycle 15 regenerator Frequency doubler 0 90 90 control loop
Power 6,7 VS up VRef 13 19 LP2 LP1 20 RFo 4
BBBi BBBi
11 12 3,16,17,18 GND
2 5
ACGND ACGND
Rev. 4651C-CELL-07/04
Pin Configuration
Figure 2. Pinning SSO20
PU ACGND GND RFO ACGND VS VS SPU BBAI BBAI 1 2 3 4 5 U2793B 6 7 8 9 10 15 14 13 12 11 LOI LOI VREF BBBI BBBI 20 19 18 17 16 LP1 LP2 GND GND GND
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U2793B
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Symbol PU ACGND GND RFO ACGND VS VS SPU BBAI BBAI BBBI BBBI VREF LOI LOI GND GND GND LP2 LP1 Function Power-up input AC ground Ground RF output AC ground Supply voltage Supply voltage Settling time power-up Baseband input A Baseband input A inverse Baseband input B Baseband input B inverse Reference voltage (2.5 V) Input LO Input LO inverse, typically grounded Ground Ground Ground Output low pass and power control Output low pass and power control
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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 Supply voltage Input voltage Junction temperature Storage temperature range Symbol VS Vi Tj TStg Value 6 0 to VS 125 -40 to +125 Unit V V C C
Thermal Resistance
Parameters Junction ambient SSO20 Symbol RthJA Value 140 Unit K/W
Operating Range
Parameters Supply voltage Ambient temperature range Symbol VS Tamb Value 4.5 to 5.5 -40 to +85 Unit V C
Electrical Characteristics
Test conditions (unless otherwise specified); VS = 5 V, Tamb = 25C, referred to test circuit. System impedance Zo = 50 , fLO =150 MHz, PLO = -15 dBm, VBBi = 1.0 Vpp, differential No. 1.1 1.2 2 2.1 2.2 2.3 3 3.1 3.2 3.3 3.4 3.5 Notes: Parameters Supply voltage range Supply current Baseband Inputs, Pin 9-10, 11-12 Input-voltage range (differential) Input impedance Input-frequency range LO Input, Pins 14 and 15 Frequency range Input level(1) Input impedance Voltage standing wave ratio Duty-cycle range fLOi PLOi ZiLO VSWRLO DCRLO 0.4 30 -15
(2)
Test Conditions
Pin 6, 7 6, 7
Symbol VS IS
Min. 4.5
Typ. 5 15
Max. 5.5
Unit V mA
Type* A A
VBBi ZBBi fBBi 0
1000 30
1500
mVpp k
D D D D D D D D
50 300 -5
MHz MHz dBm
3.5 0.6
1. Required LO level is a function of the LO frequency. 2. The LO input impedance is consisting of a 50 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 Tamb = -40C to +85C and VS = 4.5 V to 5.5 V
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U2793B
Electrical Characteristics (Continued)
Test conditions (unless otherwise specified); VS = 5 V, Tamb = 25C, referred to test circuit. System impedance Zo = 50 , fLO =150 MHz, PLO = -15 dBm, VBBi = 1.0 Vpp, differential (Continued) No. 4 Parameters RF Output, Pin 4 fLO = 150 MHz, VBBi = 1 Vpp, differential fLO = 50 MHz, VBBi = 0.3 Vpp, differential PLO = -20 dBM
(3)
Test Conditions
Pin
Symbol
Min. -3
Typ. -1 0
Max. +2
Unit
Type*
4.1
Output level
PRFo LORFO VSWRRF SBSRFo Pe Ae 35 32
dBm
A/B
4.2 4.3 4.4 4.5 4.6 4.7 5 5.1 5.2 6 6.1 7 7.1 7.2 Notes:
LO suppression Voltage standing wave ratio Sideband suppression Phase error
(4)
45 1.4 45 <1 < 0.25 -137 -143 2
dB dB deg dB dBm/Hz
A D A D D D
Amplitude error Noise floor Power-up Mode Supply current Settling time Switching Voltage, Pin 1 Power on Reference Voltage, Pin 13 Voltage range Output impedance VPU 0.5 V, pins 6, 7 VPU = 1 V Pins 1 to 4, CSPU = 100 pF CLO = 100 pF, CRFo = 1 nF VBBi = 2 V, VBBi = 3 V VBBi = VBBi = 2.5 V
NFL
IPU tSPU
10 10
1
A s
D D
VPUON VRef ZoRef
4 2.375 2.5 30 2.625
V V
D A D
1. Required LO level is a function of the LO frequency. 2. The LO input impedance is consisting of a 50 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 Tamb = -40C to +85C and VS = 4.5 V to 5.5 V
5
4651C-CELL-07/04
Figure 3. Reference Voltage versus Tamb
2.57 2.56 2.55
VRef (V)
2.54 2.53 2.52 2.51 2.5 -40 0 40 Temperature (C) 80 120
Figure 4. OIP3 versus Tamb, LO = 150 MHz, Level -10 dBm
8
6
IP3 (dBm)
4
2
0 -40 0 40 Temperature (C) 80 120
Figure 5. Supply Current versus Tamb
20
16
Supply Current (mA)
12
8
4
0 -40 0 40 Temperature (C) 80 120
6
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U2793B
Figure 6. Recommended LO Power Range versus LO Frequency at Tamb = 25 C
0
-10
PLO (dBm)
-20
-30
-40 0 50 100 150 200 250 300 fLO (MHz)
Figure 7. Output Power versus Tamb
0
-0.4
Output Power (dBm)
-0.8
-1.2
-1.6
-2 -40 0 40 Temperature (C) 80 120
Figure 8. Typical Output Power versus LO Frequency at Tamb = 25 C, VBBi = 250 mV (Differential)
0
Output Power (dBm)
-4
-8
-12
-16 0 50 100 150 200 250 300 fLO (MHz)
7
4651C-CELL-07/04
Figure 9. Typical Required VBBi Input Signal (Differential) versus LO Frequency for PO = 1 dBm and PO = -3 dBm
1200 PO = 1 dBm 1000 PO = 0 dBm
VBBI (mVpp)
800 600 400 200 0 0 50 100 150 200 250 300 fLO (MHz) PO = 3 dBm
Figure 10. Evaluation Board Circuitry
C1 1 C2 2 19 20 C9 R1
L1 PU
3 C3 OUT C4 5 U2793B L2 C5 6 4
18
17
16 C7 15
VS
7
14 C8
LO
8 C6 9
13
12
10
11
A
Ainv
GND
B
VRef
Binv
8
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U2793B
Part List C1, C2, C3, C4, C6 C7, C8 C5 C9, R1 1 nF 100 pF 100 nF 1 pF to 10 pF 50- Microstrip optional The above listed components result in a PD settling time of < 20 s. The use of other component values will require consideration for time requirements in burst-mode applications. Figure 11. PCB Layout Evaluation Board
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Application Circuits
Bias network for AC-coupled baseband inputs (VBA, VBB). R1 = 2.5 k, R2 10 k for 35 dB LO suppression which is in reference to < 2 mV input offset.
Figure 12. Application Circuit with AC-coupled Baseband Inputs
R1 VRef R2 10 BBAi BBAi LOi LOi 14 15 Duty cycle regenerator Frequency doubler 0 90 90 control loop 9 13 1n PU 1 Power up 6,7 VS 8 SPU 19 LP2 LP1 RFo ACGND BBBi BBBi 11 12 3,16,17,18 GND 2 5 ACGND Power down 100n
20 4
Figure 13. Application Circuit with DC-coupled Baseband Inputs
1n PU 1 Power up Power down 6,7 VS 8 SPU 19 Duty cycle regenerator Frequency doubler 0 90 90 control loop LP2 LP1 1n OUT 1n 1n 2 1n 3,16,17,18 GND 5 ACGND 100n
VRef 100n 10 10k BBAi 9 13
Baseband processing
10k BBAi 100p LOi 14 LO LOi 15
20
4 RFo ACGND
10k 10k 100n BBBI 11 BBBI 12
10
U2793B
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U2793B
Ordering Information
Extended Type Number U2793B-MFS U2793B-MFSG3 U2793B-NFSH U2793B-NFSG3H Package SSO20 SSO20 SSO20 SSO20 Remarks Tube Taped and reeled Tube, lead free Taped and reeled, lead free
Package Information
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4651C-CELL-07/04
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4651C-CELL-07/04

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