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Features
* * * * * *
Active Mixer with Conversion Gain Integrated LO and IF Drivers Excellent Linearity Broadband 50 W Impedance on All Ports Low LO-RF Leakage Differential or Single Ended Inputs
Applications
* AMPS/GSM/TDMA/CDMA Transmitter * Other Digital Communication Applications * High Performance RF Instrumentation
Benefits
* Small and Thin 16-pin SSOP Package with Exposed Paddle * Few External Components * Fully ESD Protected Electrostatic sensitive device. Observe precautions for handling.
High Linearity Active Transmit Mixer for 800 MHz to 1000 MHz T0785 Preliminary
Description
The T0785 is a highly linearity active mixer which is manufactured using Atmels advanced Silicon Germanium technology for the use in a variety of high performance requiring RF systems such as digital communications. This mixer features a frequency range of 800 MHz to 1000 MHz. It operates from a single 5 V supply and provides 14 dB of conversion gain while requiring only 0 dBm input to the integrated LO driver. An IF and an LO amplifier is also included. The T0785 incorporates internal matching on each RF, IF and LO port to enhance ease of use and to reduce the external components required. The RF and LO inputs can be driven differentially or single ended. Figure 1. Block Diagram
IF_IN+ 8 IF_IN12
9 5
RF_Out+
LO_IN+ 13 LO_IN-
4
RF_Out-
Rev. 4585A-SIGE-12/02
1
Pin Configuration
Figure 2. Pinning TSSOP16
Gnd Vcc Gnd RF_OutRF_Out+ Gnd Vcc IF_IN1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 Gnd Vcc Gnd LO_INLO_IN+ Gnd Vcc IF_IN+
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Paddle Symbol Gnd Vcc Gnd RF_OUTRF_OUT+ Gnd Vcc IF_INIF_IN+ Vcc Gnd LO_IN+ LO_INGnd Vcc Gnd - Function Ground Supply voltage Ground Negative RF output; nominal DC voltage is 2.3 V; (internally biased) input should be AC-coupled Positive RF output; nominal DC voltage is 2.3 V; (internally biased) input should be AC-coupled Ground Supply voltage Negative IF input; nominal DC voltage is 2.3 V, provided through off-chip inductors Positive IF input; nominal DC voltage is 2.3 V, provided through off-chip inductors Supply voltage Ground Negative local oscillator input; nominal DC voltage is 2.3 V; (internally biased) input should be ACcoupled Positive local oscillator input; nominal DC voltage is 2.3 V; (internally biased) input should be AC-coupled Ground Supply voltage Ground Device ground and heat sink, requires good thermal path; RF reference plane
2
T0785
4585A-SIGE-12/02
T0785
Absolute Maximum Ratings
Parameters Supply voltages, no RF applied LO input signals IF input signals Operating case temperature Storage temperature Symbol VCC LO_IN-; LO_IN+ IF_IN-; IF_IN+ Value -0.5 to +5.5 10.0 10.0 -40 to +85 -55 to +150 Unit V dBm dBm C C
TC
TSTG
Thermal Resistance
Parameters Junction ambient Symbol RthJA Value 25 Unit K/W
Electrical Characteristics
Test conditions: Unless otherwise noted, the following conditions apply to typical performance specification under static conditions: VCC = +5.0 V, Tamb = 25C; PLO = 0 dBm; IF = 200 MHz; PIF = -20 dBm
No. Parameters General Performance Supply voltage Supply current LO drive LO, IF, RF return loss Note: Matched to 50 W Matched to 50 W VCC ICC -3 4.75 5.0 200 0 14 +3 5.25 V mA dBm dB Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
3
4585A-SIGE-12/02
RF Electrical Characteristics
Test conditions: Unless otherwise noted, the following conditions apply to typical performance specification under static conditions: Vcc = +5.0 V, Tamb = 25C; PLO = 0 dBm; IF = 200 MHz; PIF = -20 dBm
No. Parameters Mixer RF Performance RF frequency LO frequency IF frequency Conversion gain SSB noise figure Output IP3 Output P1dB Leakage (LO-RF) Leakage (LO-IF) Mixer RF Performance RF frequency LO frequency IF frequency Conversion gain SSB noise figure Output IP3 Output P1dB Leakage (LO-RF) Leakage (LO-IF) Note: IF1 = IF2 = -20 dBm/tone, 1 MHz spacing fRF fLO fIF G NF OIP3 P1dB 19 6 900 700 30 11 200 14 9.0 22 8.5 -30 -35 -20 -25 1000 800 400 16 11.0 MHz MHz MHz dB dB dBm dBm dBm dBm IF1 = IF2 = -20 dBm/tone, 1 MHz spacing fRF fLO fIF G NF OIP3 P1dB 17 5 800 600 30 9 200 12 9.0 21 7 -35 -40 -25 -30 900 700 400 16 11.0 MHz MHz MHz dB dB dBm dBm dBm dBm Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
4
T0785
4585A-SIGE-12/02
T0785
Typical Performance
Figure 3. Conversion Gain versus Frequency + Temperature
Conversion Gain vs Temperature Plo=0 dBm
18
Conversion Gain (dB)
16 14 12 10 8 6 4 85C 25C -40C
800
850
900 Frequency (MHz)
950
1000
Figure 4. Output IP3 versus Frequency + Temperature
Output IP3 vs Temperature Plo=0 dBm
26 Output IP3 (dBm) 24 22 20 18 16 14 800 850 900 Frequency (MHz) 85C 25C -40C
950
1000
Figure 5. Output IP3 versus Frequency + LO Drive
Output IP3 vs LO Drive T=25 C
26 Output IP3 (dBm) 24 22 20 18 16 14 800 850 900 Frequency (MHz) -3 dBm 0 dBm +3 dBm 950 1000
5
4585A-SIGE-12/02
Figure 6. Leakages versus Frequency
Leakages Plo=0 dBm at pins T=25 C (Note 2)
0 Leakage (dBm) -10 -20 -30 -40 -50 -60 500 600 700 800 900 1000 LO-RF LO-IF
Frequency (MHz)
Figure 7. Noise Figure versus Frequency + Temperature
Noise Figure vs Temperature Plo=0 dBm
16 Noise Figure (dB) 14 12 10 8 6 4 800 850 900 Frequency (MHz) 950 1000 85C 25C -40C
Figure 8. RF and LO Return Loss versus Frequency
RF & LO Return Loss (Note 1)
0 Return Loss (dB) -5 -10 -15 -20 -25 400 RF RL LO RL
600
800
1000
1200
RF Frequency (MHz)
6
T0785
4585A-SIGE-12/02
T0785
Figure 9. Output P1dB versus Frequency + Temperature
Output P1dB vs Temperature Plo=0 dBm
12 Output P1dB (dBm) 10 8 6 4 2 0 800 850 900 Frequency (MHz) 85C 25C -40C 950 1000
Figure 10. IF Return Loss versus Frequency
IF Return Loss (Note 1)
0 -5 Return Loss (dB) -10 -15 -20 -25 -30 -35 0 100 200 IF Frequency (MHz) 300 400
Figure 11. Output P1dB versus Frequency + LO Drive
Output P1dB vs LO Drive T=25 C
12 Output P1dB (dBm) 10 8 6 4 2 0 800 850 900 Frequency (MHz) 950 -3 dBm 0 dBm +3 dBm
1000
7
4585A-SIGE-12/02
Figure 12. Demo Board Schematic
5V
Lfil
Vcc
C3 IC1 1 2 3 4 5 6 7 8 C7 T2 16 15 14 13 12 11 10 9 C9 C1
C30
Vcc
RFout J3 T9 L1 C4 C5
Vcc
C11 C12 T11 J4 LOin
Vcc
C20
T0787
Vcc
C21
J5 IFin
Bill of Material of Demo Board
Parameters Highly linear active mixer Capacitor Capacitor Capacitor Capacitor Inductor Inductor Transformer Transformer RF connector Note: 1. Other sizes are possible. C7, C9 C1, C3, C20, C21, C30 C11, C12 C4, C5 Lfil L1 T9; T11 T2 Wurth Elektronik TOKO Panasonic Mini-Circuits
(R)
Test Conditions
Pin Atmel
Symbol T0785
Min. 100 pF 27 pF 22 pF 5.6 pF
Typ. 16-pin TSSOP 0603 0603 0603 0603 1210 0603
74476401 LL1608FS39NJ EHF-FD1618 TC1-1 142-0701-851
1 H 39 nH
Johnson Components
SMA
8
T0785
4585A-SIGE-12/02
T0785
Figure 13. Demo Test Board
9
4585A-SIGE-12/02
Recommended Package Footprint
Notes: 1. Only ground signal traces are allowed directly under the package. 2. Primary dimensions are in millimeter alternate dimensions are in inches.
1.25
0.25 0.74 0.4 3.0 0.74
3.0
f0.33 via
0.7
0.9
6.9
all units are in mm - Indicates metalization - vias connect pad to underlying ground plane
Remark: Heatslug must be soldered to GND! Plugging of the ground vias under the heat slug is also recommended to avoid soldering problems.
10
T0785
4585A-SIGE-12/02
T0785
.
Ordering Information
Extended Type Number T0785 Package TSSOP16 Remarks 5.0 mm 6.4 mm
Package Information
11
4585A-SIGE-12/02
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(c) Atmel Corporation 2002. Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company's standard warranty which is detailed in Atmel's Terms and Conditions located on the Company's web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel's products are not authorized for use as critical components in life support devices or systems.
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4585A-SIGE-12/02 xM

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