ATR0785-6CP - Atmel - Product.Network

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.

Description

The ATR0785 is a highly linearity active mixer which is manufactured using Atmel´s

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 ATR0785 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

RF_Out+

RF_Out-LO_IN+

LO_IN-

IF_IN+

IF_IN- 8

High Linearity

Active Transmit

Mixer for

800 MHz to

1000 MHz

ATR0785

Preliminary

Rev. 4585B–SIGE–02/03

2ATR0785

4585B–SIGE–02/03

Pin Configuration

Figure 2. Pinning TSSOP16

Gnd

Vcc

Gnd

RF_Out-

RF_Out+

Gnd

Vcc

IF_IN-

Gnd

Vcc

Gnd

LO_IN-

LO_IN+

Gnd

Vcc

IF_IN+

Pin Description

Pin Symbol Function

1 Gnd Ground

2 Vcc Supply voltage

3 Gnd Ground

4 RF_OUT- Negative RF output; nominal DC voltage is 2.3 V; (internally biased) input should be AC-coupled

5 RF_OUT+ Positive RF output; nominal DC voltage is 2.3 V; (internally biased) input should be AC-coupled

6 Gnd Ground

7 Vcc Supply voltage

8 IF_IN- Negative IF input; nominal DC voltage is 2.3 V, provided through off-chip inductors

9 IF_IN+ Positive IF input; nominal DC voltage is 2.3 V, provided through off-chip inductors

10 Vcc Supply voltage

11 Gnd Ground

12 LO_IN+ Negative local oscillator input; nominal DC voltage is 2.3 V; (internally biased) input should be AC-

coupled

13 LO_IN- Positive local oscillator input; nominal DC voltage is 2.3 V; (internally biased) input should be AC-coupled

14 Gnd Ground

15 Vcc Supply voltage

16 Gnd Ground

Paddle – Device ground and heat sink, requires good thermal path; RF reference plane

ATR0785

4585B–SIGE–02/03

Absolute Maximum Ratings

Parameters Symbol Value Unit

Supply voltages, no RF applied VCC -0.5 to +5.5 V

LO input signals LO_IN-; LO_IN+ 10.0 dBm

IF input signals IF_IN-; IF_IN+ 10.0 dBm

Operating case temperature TC-40 to +85 °C

Storage temperature TSTG -55 to +150 °C

Thermal Resistance

Parameters Symbol Value Unit

Junction ambient RthJA 25 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 = 25°C; PLO = 0 dBm; IF = 200 MHz; PIF = -20 dBm

No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*

General Performance

Supply voltage VCC 4.75 5.0 5.25 V

Supply current ICC 200 mA

LO drive Matched to 50 W -3 0 +3 dBm

LO, IF, RF return loss Matched to 50 W14 dB

Note: *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter

4ATR0785

4585B–SIGE–02/03

RF Electrical Characteristics

Test conditions: Unless otherwise noted, the following conditions apply to typical performance specification under static

conditions: Vcc = +5.0 V, Tamb = 25°C; PLO = 0 dBm; IF = 200 MHz; PIF = -20 dBm

No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*

Mixer RF Performance

RF frequency fRF 800 900 MHz

LO frequency fLO 600 700 MHz

IF frequency fIF 30 200 400 MHz

Conversion gain G 9 12 16 dB

SSB noise figure NF 9.0 11.0 dB

Output IP3

IF1 = IF2 =

-20 dBm/tone,

1 MHz spacing

OIP3 17 21 dBm

Output P1dB P1dB 5 7 dBm

Leakage (LO-RF) -35 -25 dBm

Leakage (LO-IF) -40 -30 dBm

Mixer RF Performance

RF frequency fRF 900 1000 MHz

LO frequency fLO 700 800 MHz

IF frequency fIF 30 200 400 MHz

Conversion gain G 11 14 16 dB

SSB noise figure NF 9.0 11.0 dB

Output IP3

IF1 = IF2 =

-20 dBm/tone,

1 MHz spacing

OIP3 19 22 dBm

Output P1dB P1dB 6 8.5 dBm

Leakage (LO-RF) -30 -20 dBm

Leakage (LO-IF) -35 -25 dBm

Note: *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter

ATR0785

4585B–SIGE–02/03

Typical Performance Figure 3. Conversion Gain versus Frequency + Temperature

Figure 4. Output IP3 versus Frequency + Temperature

Figure 5. Output IP3 versus Frequency + LO Drive

Conversion Gain vs Temperature

Plo=0 dBm

800 850 900 950 1000

Frequency (MHz)

Conversion Gain (dB)

85C

25C

-40C

Output IP3 vs Temperature

Plo=0 dBm

800 850 900 950 1000

Frequency (MHz)

Output IP3 (dBm)

85C

25C

-40C

Output IP3 vs LO Drive

T=25 C

800 850 900 950 1000

Frequency (MHz)

Output IP3 (dBm)

-3 dBm

0 dBm

+3 dBm

6ATR0785

4585B–SIGE–02/03

Figure 6. Leakages versus Frequency

Figure 7. Noise Figure versus Frequency + Temperature

Figure 8. RF and LO Return Loss versus Frequency

Leakages

Plo=0 dBm at pins

T=25 C (Note 2)

-60

-50

-40

-30

-20

-10

500 600 700 800 900 1000

Fre que ncy (M Hz)

Leakage (dBm)

LO-RF

LO-IF

Noise Figure vs Temperature

Plo=0 dBm

800 850 900 950 1000

Frequency (MHz)

Noise Figure (dB)

85C

25C

-40C

RF & LO Return Loss (Note 1)

-25

-20

-15

-10

-5

400 600 800 1000 1200

RF Frequency (MHz)

Return Loss (dB)

RF RL

LO RL

ATR0785

4585B–SIGE–02/03

Figure 9. Output P1dB versus Frequency + Temperature

Figure 10. IF Return Loss versus Frequency

Figure 11. Output P1dB versus Frequency + LO Drive

Output P1dB vs Temperature

Plo=0 dBm

800 850 900 950 1000

Fr e que ncy (M Hz)

Output P1dB (dBm)

85C

25C

-40C

IF Return Loss (Note 1)

-35

-30

-25

-20

-15

-10

-5

0 100 200 300 400

IF Frequency (MHz)

Return Loss (dB)

Output P1dB vs LO Drive

T=25 C

800 850 900 950 1000

Frequency (MHz)

Output P1dB (dBm)

-3 dBm

0 dBm

+3 dBm

8ATR0785

4585B–SIGE–02/03

Figure 12. Demo Board Schematic

Lfil

Vcc

ATR0787

Vcc

C20

Vcc

C21

Vcc

LOin

RFout

IFin

C12

C11 T11

C30

IC1

J3 J4

Bill of Material of Demo Board

Parameters Test Conditions Pin Symbol Min. Typ.

Highly linear active mixer Atmel ATR0785 16-pin TSSOP

Capacitor C7, C9 100 pF 0603

Capacitor C1, C3, C20, C21, C30 27 pF 0603

Capacitor C11, C12 22 pF 0603

Capacitor C4, C5 5.6 pF 0603

Inductor Lfil Würth Elektronik 74476401 1 µH 1210

Inductor L1 TOKO LL1608-

FS39NJ 39 nH 0603

Transformer T9; T11 Panasonic EHF-FD1618

Transformer T2 Mini-Circuits®TC1-1

RF connector Johnson

Components 142-0701-851 SMA

Note: 1. Other sizes are possible.

ATR0785

4585B–SIGE–02/03

Figure 13. Demo Test Board

10 ATR0785

4585B–SIGE–02/03

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.

Remark: Heatslug must be soldered to GND!

Plugging of the ground vias under the heat slug is also recommended to avoid soldering problems.

3.0

0.25

1.25

6.9

0.74

0.7

0.9

0.4

f0.33 via

- Indicates metalization - vias connect pad to underlying ground plane

all units are in mm

ATR0785

4585B–SIGE–02/03

Package Information

Ordering Information

Extended Type Number Package Remarks

ATR0785 TSSOP16 5.0 mm ´ 6.4 mm

Printed on recycled paper.

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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4585B–SIGE–02/03 xM

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