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SL2009
Dual stage IF amplifier for cable tuners
DS5507
ISSUE 1.4
March 2002
Features
* * * * * Single chip solution for tuner IF gain and AGC Contains 34 dB of AGC shared between two AGC stages Design optimised for high signal handling with low inter-modulation spurious generation I/O ports optimised to interface with standard SAW filters ESD protection (Normal ESD handling procedures should be observed)
Ordering Information SL2009/KG/NP1T (Tape and Reel) SL2009/KG/NP1S (Tubes)
The devices includes two stages of IF gain which are both optimised to interface with inter-stage filters. Both stages contain independent AGC facility, and the first stage contains a level detect for control of the tuner AGC.
Applications
* * Cable Network interface modules and tuners Data communications systems
IFIP IFIPB VCCIF AGC2 IFOP
1
16
VCCSAW SDRIVEOP SDRIVEOPB AGCOUT AGC1 SDRIVEIP SDRIVEIPB
Description
The SL2009 is a dual IF amplifier intended for application in cable tuners, and integrates all of the IF gain and AGC required to deliver 1Vp-p in a standard tuner configuration.
VEE IFOPB VEE 8 9
AGCBIAS
NP16 Figure 1 - Pin allocation
(12)
AGC1
AGC SENDER
AGC SENDER
AGCBIAS (9) AGCOUT (13)
(11) SDRIVEIP (10) SDRIVEIPB (15) SDRIVEOP
SAW Driver VccSAW (16) Vee (6,8) VccIF (3)
(14) SDRIVEOPB
(1) IFIP (2) IFIPB
AGC
IFOP (5) IFOPB (7)
(4) AGC2
SENDER
Figure 2 - Block diagram
1
SL2009
Characteristics SAWF driver stage Input operating range Input NF, referred to 2k OPIP3 Gain IF Amplifier stage Input operating range Input NF, referred to 2 k OPIP3 Gain Table 1 - Quick reference data 30 - 50 6 8 20 - 40 MHz dB dBV dB 30 - 50 4 4 14 - 28 MHz dB dBV dB Units
Functional Description
The SL2009 is an IF amplifier intended primarily for application in cable tuners, and requiring a minimum external component count to integrate the IF gain, AGC facility and level detect. The pin allocation is contained in figure (1) and the block diagram in figure (2)
different AGCBIAS conditions is contained in figure (4). See figures (5) and (6) for SAW amplifier input and output impedances respectively.
IF amplifier section
In normal application the output of the SAW filter is coupled differentially to the input preamplifier of the IF amplifier, which presents a differential 2 k 3 pF load to the SAW filter and is optimised for both signal handling and NF. See figure (8) for IF amplifier input impedance. The input preamplifier, then interfaces with the variable gain stage which is under control of the second AGC sender and this provides for 20 dB of gain control. The typical AGC characteristic is contained in figure (7) The AGC output is then connected to the output driver stage, which presents a low differential output impedance, see figure (9) and is optimised for output signal handling. The typical key performance data at 5V Vcc and 25 deg C ambient are shown in the table entitled 'QUICK REFERENCE DATA'.
SAWF driver stage
In normal application the IF output of the tuner, which is typically in the region of 30-50 MHz, is interfaced to input preamplifier of the SAWF driver stage, which is optimised for both signal handling and NF referred to 2 k. The input preamplifier interfaces with the variable gain stage, which is under control of the first AGC sender and provides for 14 dB of gain control. The typical gain characteristic is contained in figure (3). The AGC stage then interfaces with the output buffer amplifier, which presents a balanced 50 drive to the IF SAW filter and offers high signal handling to minimise intermodulation distortions. The SAWF amplifier also incorporates a level detect block whose output AGCOUT, can be used to control the gain of the SAWF amplifier or other gain stages in front of the SL2009. This AGC characteristic can be set up by a "current set" resistor connected between the AGCBIAS input and Vee. The typical characteristic curve for AGC set, output level under
2
SL2009
SAWF Driver AGC Slope, (Vcc = 5v, 25'C)
35
30
25
Gain (dB)
20 15 10 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
AGC Voltage (V)
Figure 3 - Typical SAWF driver stage AGC characteristic
Closed Loop SAWF Driver OP vs RAGC (Vcc = 5v, 25'C)
114
112
110
O/P Level (dBuV)
108
106
104
102
100 0 1 2 3 4 5
RAGC (Kohm)
Figure 4 - AGCOUT characteristic versus AGCBIAS resistor
3
SL2009
CH1
S11
1 U FS
8 Feb 2001 16:27:29
PRm Cor Avg 16
Normalised to 2 K
1
1: 2.3 K - 56 2.3 K
= 2.8 nF @ 1MHz
4 2 3
2: 1.2 K - 1.0 K = 1.2 K 4.4 pF @ 36 MHz 3: 932 - 1.1 K 932 = 2.9 pF @ 50 MHz = 2.0 pF @100MHz
START
1.000 000 MHz
STOP 100.000 000 MHz
4: 448 - 760 448
Figure 5 - Typical SAWF driver input impedance, single-ended
CH1
S11
1 U FS
1_: 132.01
9 Feb 2001 12:27:19 -1.5938
99.862 nF
1.000 000 MHz PRm Cor Avg 16
1
Normalised to 50
43 2
2_: 121.2 -12.078 36MHZ 3_: 117.25 50MHz 4_: 110.06 -7.5742W 100MHz

START
1.000 000 MHz
STOP 100.000 000 MHz
Figure 6 - Typical SAWF driver output impedance, single-ended
4
SL2009
IFAmp AGC Slope ( Vcc = 5v, 25'C)
50
40
30
Gain (dB)
20
10
0
-10
-20 0 1 2 3 4 5
AGC Voltage (V)
Figure 7 - Typical IF amplifier stage AGC characteristic
5
SL2009
8 Feb 2001 16:19:58 CH1 S11 1 U FS

PRm Cor Avg 16
1
Normalised to 2 K 1: 2.3 K - 60 2.38 K
2 4 3
= 2.6 nF @ 1MHz
2: 1.1 K - 1.2 K = 1.1 K 3.7 pF @ 36 MHz 3: 736 - 1.08 K = 733 2.9 pF @ 50 MHz 4: 340 - 728 344 = 2.2 pF
START
1.000 000 MHz
STOP 100.000 000 MHz
Figure 8 - Typical IF amplifier input impedance, single-ended
CH1
S11
1 U FS
1_: 9.8564
9 Feb 2001 16:17:56 114.26 m
17.66 nH
1.029 700 MHz PR m Cor
3 21 4
Normalised to 50 2_: 7.8931 6.0146 36MHZ 3_: 11.521 9.3154 50MHz 4_: 26.014 2.7539 100MHz
START 1.000 000 MHz STOP 100.000 000 MHz

Figure 9 - Typical IF amplifier output impedance, single-ended
6
SL2009
Electrical Characteristics
Test conditions (unless otherwise stated) Tamb = -40 to 85C, Vee= 0V, VccIF = 5V+-5%, VccSAW =5V+-5% These characteristics are guaranteed by either production test or design. They apply within the specified ambient temperature and supply voltage unless otherwise stated.
Characteristics Supply current
pin 3,16
min
typ 50
max 70
units mA
Conditions Pin (3) VccIF and pin (16) VccSAW are isolated on chip.
Operating frequency Gain Flatness
30
50 1dB
MHz Over specified output range. Excluding SAW filter contributions. 8MHz B/W. See note (4) k pF
SAWF driver Input impedance 10,11 2 3 Noise Figure 4 6 Differential, see figure (5)
dB
Tamb=27C, referred to source impedance of 2 k conversion gain set at 28 dB
Variation in NF with gain adjust Output referred IP3 Gain 3
-1
dB/dB dBV Over specified gain range, see note (1) and (4) Voltage conversion gain from 2 k differential source to 1 k//10 pF single-ended load, see note (4) Vagc1=1.5V Vagc1=3.5V AGC monotonic from Vee to Vcc. See Figure (3) Single-ended, see figure (6) Single-ended into 1 k // 10 pF load 3rd Harmonic of wanted output signal better than 10dBC. Vee<=Vagc1<=Vcc 1.5V<=Vagc1<=3.5V Source and sink See note (3), max load current 50 A See figure (4)
Maximum Minimum
25.5 8.5
32 15
dB db
Output impedance Output return loss Output limiting
14,15 14,15 14,15 1.8
50 9
dB Vp-p
AGC1 Leakage current
12
-110 -50
110 50 200 350 3.5
A A A V
AGCOUT charging current AGCOUT voltage range AGC output level set
13 13
150 0.5
Table 2 - Electrical Characteristics
7
SL2009
Characteristics IF amplifier Input impedance 1,2 2 3 Noise Figure 4 6 k pF dB Tamb=27C, referred to source impedance of 2 k conversion gain set at 40 dB Differential, see figure (8) pin min typ max units Conditions
Variation in NF with gain adjust Output referred IP3 5,7 5 4 Gain
-1
dB/dB dBV dBV With gains of 24dB and above, see note (2) With gains from 20dB to 24dB, see note (2) Voltage conversion gain from 2 k differential source to 1 k // 15 pF single-ended load, see figure (7) Vagc2=1.0V Vagc2=4.25V AGC monotonic from Vee to Vcc Single-ended, see figure (9) Single-ended into to 1 k // 15 pF load. 3rd Harmonic of wanted output signal better than 10dBC.
Maximum Minimum
38 20
dB dB
Output impedance Output limiting
5,7 5,7 1.8
25
Vp-p
AGC2 leakage current
4
-110
110
A
Table 2 - Electrical Characteristics (continued) Notes: (1) (2) (3) (4) Two output tones at 104 dBV within operating range Two output tones at 108 dBV within operating range When controlling external AGC the current load on AGCOUT should be minimised For maximum performance, capacitive load should be resonated with appropriate inductance at chosen IF frequency.
Absolute Maximum Ratings All voltages are referred to Vee at 0V, and VccIF=VccSAW
8
SL2009
Absolute Maximum Ratings
All voltages are referred to Vee at 0V, and VccIF=VccSAW Characteristics Supply voltage All I/O port DC offsets Storage temperature Junction temperature Package thermal resistance, chip to case Package thermal resistance, chip to ambient Power consumption at 5.25V ESD protection 2 min -0.3 -0.3 -55 max 7 Vcc+0.3 150 150 32.2 108.1 368 units V V C C C C/W mW kV Mil-std 883B method 3015 cat1 conditions
Table 3 - Absolute Maximum Ratings
9
SL2009
F1 muRata SX-7168 Vcc PL1 1 2 Power C1 10uF C2 100nF C3 100pF 6 4
L1 1uH
1 2,5 R5 0R NF SK2 SMA R6 0R NF
3
C15 10pF R7 1K C9 470nF 470nF Vcc 3 PL2 2 1 Link R9 470R C11 10nF 4 5 6 7 C16 8 470nF C17 470nF L3 1uH R13 1K C13 15pF 470nF 470nF R2 1K R1 1K SK1 SMA IC1 1 2 IFIP IFIPB VccIF AGC2 IFOP Vee IFOPB Vee SL2009 VccSAW SDriveOP SDriveOPB AGCout AGC1 SDriveIP SDriveIPB AGCbias Vcc 16 15 14 13 TP2 12 11 10 9 C5 C4 TP1 C6 10nF C8 C7 470nF 470nF
R15 1K
R14 0R NF
R4 R3 0R NF 0R NF
R8 1K C10
R17 0R AGC select 1 2 3 4 PL3 R16 1K C14 10pF L4 1uH
SK5 SMA
SK3 SMA L2 1uH R12 1K SK4 SMA
C12 15pF
Figure 10 - Evaluation Board Schematic
Figure 11 - Top Layout
Figure 12 - Bottom Layout
10
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