MITEL SL2015, SL2015KG, SL2015QP1S, SL2015QP1T Datasheet

FEATURES

■ Single chip full band solution, compatible with
digital and analog transmissions

■ Low noise RF input

■ High input signal handling to eliminate the

requirement for front end AGC

■ Low phase noise local oscillator

■ No prescaler in LO output drive, optimal

architecture for low phase noise applications

■ Low radiation design

■ IF AGC amplifier with dual selectable outputs

■ ESD protection. (Normal ESD handling

procedures should be observed)

ORDERING INFORMATION

SL2015/KG/QP1S (Tubes)
SL2015/KG/QP1T (Tape and Reel)

The SL2015 is a fully integrated mixer oscillator with output

AGC, intended primarily for application in satellite tuners,
where it downconverts the first high IF from the outdoor unit to
the second IF for data demodulation.

The device contains a low noise RF input amplifier and

mixer functioning to 2.15GHz, an integrated low phase noise
local oscillator and an AGC IF output buffer amplifier. The IF
signal is available at one of two outputs selected by the IF-OP­SEL input.

The signal handling of the SL2015 is sufficient to greatly

simplify or remove the requirement for input AGC with
appropriate image filtering in full band systems, or to remove
the requirement for band limit filtering with appropriate AGC
in half band systems.

APPLICATIONS

■ Satellite tuners

■ Communications systems

PIN 1

REF. SPOT

Fig.1 Pin connections - top view

V

EE

V

EE

-RF

RF INPUTB

RF INPUT

V

CC

-RF

VCC-LO

TANK

TANKB

V

EE

-LO

IF-OP-SEL

AGC CONTROL
IF OUTPUT1
IF OUTPUT1B

V

CC

-IF

LO OUTPUT

LO OUTPUTB
V

EE

-IF

IF OUTPUT2B

V

EE

IF OUTPUT2

QP20

SL2015

Full Band Satellite Tuner

Advance Information

Supersedes April 1997 version, DS4548 - 2.1 DS4593 - 3.2 February 1998

2

SL2015

QUICK REFERENCE DATA

Characteristic Units

RF input noise figure 16 dB
Maximum conversion gain 33 dB
Minimum conversion gain -5 dB
IF1 and IF2 output gain match 2 dB
IP3

2T

input referred at minimum conversion gain +3 dBm
IP22T input referred at minimum conversion gain +17 dBm
LO phase noise at 10kHz -75 dBc/Hz

Fig. 2 Block diagram

TANKB

TANK

8

7

16
15

LO OUTPUT
LO OUTPUTB

19

18

IF OUTPUT1

IF OUTPUT1B

13

12

IF OUTPUT2

IF OUTPUT2B

20

AGC CONTROL

10

IF-OP-SEL

3
4

RF INPUTB

RF INPUT

5,6,17

1,2,9,11,14

V

CC

V

EE

3

SL2015

The SL2015 is a downconverter mixer oscillator with an
output AGC amplifier, when used with appropriate external
varactor tuned oscillator sustaining network performs the first
IF tuning function for a full band satellite receiver system. A
block diagram is contained in Fig. 2.

In application the RF input of the device is interfaced
through appropriate impedance matching to the first IF
signal, which is downlinked from the outdoor unit at typically
950-2150MHz. The RF input preamplifier of the device is
designed for low noise figure and for low distortion so
eliminating the requirement for RF AGC. The preamplifier
also provides gain to the mixer section and back isolation from
the local oscillator section.

The output of the preamplifier is fed to the mixer section
where the RF signal is mixed with the local oscillator
frequency, which is generated by an on-board oscillator. The
oscillator block uses an external tunable sustaining network
and is optimised for low phase noise. This section also
contains a buffer drive whose outputs can be used to
frequency lock the LO carrier to the required channel.

Signals from the mixer are fed to the AGC IF amplifier,
which gives an overall conversion gain programmable from

-10 to +30dB. The output of this stage can be switched to one
of two outputs to facilitate IF processing.

FUNCTIONAL DESCRIPTION

Fig. 3 RF input matching network

Fig. 4 VCO application circuit

6.2nH
TO DEVICE

0.7pF

6mm STRIPLINE

Fig. 5 LO phase noise variation with frequency (typical)

2 x 1T379

10kΩ

Vcnt

0.75p

TANK

TANKB

0.75p

6mm STRIPLINE

SL2015 phase noise

-78.00

-76.00

-74.00

-72.00

-70.00

-68.00

-66.00

-64.00

-62.00
1400 1600 1800 2000 2200 2400 2600 2800

LO frequency MHz

Phase noise dBc/Hz @10kHz

LO frequency MHz

Lo frequency MHz

SL2015 phase noise

4

SL2015

Fig. 6 IP3 variation with gain setting (minimum)

-20 -10 10 20

30 40

-5

-10

-15

-20

-25

IP3 (dBm)

Conversion gain
(dB)

+5

Applies for a constant IF output level of -14dBm

Applies for a constant IF output level of -14dBm

-20 -10 10 20

30 40

-5

-10

-15

-20

+15

+10

+5

IP2 (dBm)

Fig. 7 IP2 variation with gain setting (minimum)

5

SL2015

Fig. 8 P1dB with gain setting (typical)

-10

-20

-30

+10

+30

+20

X

X

X

0

-10

RF input level at P1dB (dBm)

Gain setting (dB)

AGC voltage (V)

Conversion gain (dB)

-20

-15

-10

-5

0

5

10

15

20

25

30

1.2

1.4

1.6

1.8 2

2.2 2.4 2.6

2.8 3

3.2 3.4 3.6 3.8

4

35

Fig.9 Gain variation with AGC voltage (typical)

6

SL2015

RF inputs IF output select input

Local oscillator inputs

IF outputs

LO buffer drive

AGC input

LO OUTPUT

LO OUTPUTB

V

cc

Fig. 10 Input/output interface circuits

V

REF4

AGC

12K

CONTROL

2K

V

REF 1

300 300

RF INPUTS

V

REF 3

V

cc

IF-OP-SEL

OUTPUT

50

50

OUTPUTB

V

REF 2

1K 1K

TANK

TANKB