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Электронный компонент: MAX2106

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General Description
The MAX2106 low-cost, direct-conversion tuner IC is
designed for use in digital direct-broadcast satellite
(DBS) television set-top box units and is a pin-for-pin
upgrade for the MAX2104. Its direct-conversion archi-
tecture reduces system cost compared to devices with
IF-based architectures. The MAX2106 directly tunes L-
band signals to baseband using a broadband I/Q
downconverter. The operating frequency range spans
925MHz to 2175MHz.
The IC includes a low-noise amplifier (LNA) with gain
control, I and Q downconverting mixers, lowpass filters
with gain and frequency control, a local oscillator (LO)
buffer with a 90 quadrature network, and a charge-
pump-based phase-locked loop (PLL) for frequency
control. The MAX2106 has an on-chip LO, requiring
only an external varactor-tuned LC tank for operation.
The LO's output drives the internal quadrature genera-
tor and has a buffer amplifier to drive off-chip circuitry.
The MAX2106 comes in a 48-pin thin quad flat-pack
package with exposed paddle (EP).
Applications
Advantages Over MAX2104
o Improved Front End Achieves 10.2dB NF at 1550MHz
o Higher Input IIP3: 11.5dBm at 1550MHz
o Reduced Spurious Downconversion Products
o Capable of Using an External Synthesizer
Features
o Drop-In Replacement for MAX2104 Designs:
Requires Only Minor Software Upgrade and
Two External Resistor Value Changes
o Complete Low-Cost Solution for DBS Direct
Downconversion
o High Level of Integration Minimizes Component
Count
o 1MBaud to 45MBaud Operation
o Selectable LO Buffer
o +5V Single-Supply Operation
o 925MHz to 2175MHz Input Frequency Range
o On-Chip Quadrature Generator, Dual-Modulus
Prescaler (/32, /33)
o On-Chip Crystal Oscillator Amplifier
o PLL Phase Detector with Gain-Controlled Charge
Pump
o Input Levels: -25dBm to -68dBm per Carrier
o Over 50dB Gain Control Range
o Noise Figure = 10.2dB; IIP3 = +11.5dBm
(at 1550MHz)
o Automatic Baseband Offset Correction
MAX2106
DBS Direct Downconverter
________________________________________________________________ Maxim Integrated Products
1
19-1627; Rev 2; 6/03
Functional Diagram appears at end of data sheet.
Ordering Information
Pin Configuration
*Exposed paddle.
48 TQFP-EP*
PIN-PACKAGE
TEMP RANGE
0C to +85C
MAX2106UCM
PART
PLLIN-
PLLIN+
MOD-
MOD+
LODIVSEL
IOUT+
IOUT-
V
CC
QOUT+
QOUT-
RFBAND
FLCLK
V
CC
CFLT
XTL-
XTL+
GND
V
CC
RFIN-
RFIN+
GND
GND
QDC-
QDC+
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
IDC-
IDC+
LOBUFSEL
GND
RFOUT
CPG1
V
CC
XTLOUT
CPG2
GC1
GC2
INSEL
CP
FB
GND
V
CC
TANK+
VRLO
TANK-
GND
GND
V
CC
LOBUF-/TPSOUT-
LOBUF+/FPSOUT+
TQFP
MAX2106
TOP VIEW
U.S. DSS Set-Top Receivers
European DVB-Compliant
Systems
Cellular Base Stations
Wireless Local Loop
Broadband Systems
LMDS
Professional Receivers
VSAT
Microwave Links
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX2106
DBS Direct Downconverter
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +4.75V to +5.25V, V
FB
= +2.4V, C
IOUT_
= C
QOUT_
= 10pF,
FLCLK
= 2MHz, RFIN_ = unconnected, R
IOUT_
= R
QOUT_
= 10k
,
V
LOBUFSEL
= 0.5V, V
RFBAND
= V
INSEL
= V
CPG1
= V
CPG2
= +2.4V, V
PLLIN+
= V
MOD+
= +1.3V, V
PLLIN-
= V
MOD-
= +1.1V, T
A
= +25C,
unless otherwise noted. Typical values are at V
CC
= +5V, unless otherwise noted.)
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
CC
to GND ..............................................................-0.3V to +7V
All Other Pins to GND................................-0.3V to (V
CC
+ 0.3V)
RFIN+ to RFIN-, TANK+ to TANK-,
IDC+ to IDC-, QDC+ to QDC- .........................................2V
IOUT_, QOUT_ to GND Short-Circuit Duration .......................10s
LOBUF+/PSOUT+, LOBUF-/PSOUT- Short-Circuit Duration..10s
Continuous Current (any pin other than V
CC
or GND)........20mA
Continuous Power Dissipation (T
A
= +70C)
48-Pin TQFP-EP (derate 27mW/C above +70C) ..........1.5W
Operating Temperature ..........................................0C to +85C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10s) .................................+300C
XTLOUT Output DC Voltage
1.9
V
RFBAND Input Current
-200
200
A
1.44
1.8
2.16
mA
0.48
0.6
0.72
V
CPG1
2.4V, V
CPG2
2.4V
V
CPG1
2.4V, V
CPG2
0.5V
0.24
0.3
0.36
V
CPG1
0.5V, V
CPG2
2.4V
Operating Supply Current
I
CC
195
275
mA
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Input Current
I
IN
-15
10
A
Input Voltage Low
V
IL
0.5
V
Input Voltage High
V
IH
2.4
V
FLCLK Input Voltage High
1.85
V
FLCLK Input Voltage Low
1.45
V
FLCLK Input Current (Note 1)
-1
1
A
Operating Supply Voltage
V
CC
4.75
5.25
V
Common-Mode Input Voltage
V
CMI
1.08
1.2
1.32
V
Input Voltage Low
-100
mV
Input Voltage High
100
mV
Input Current (Note 1)
-5
5
A
Common-Mode Output Voltage
V
CMO
2.16
2.4
2.64
V
Output Voltage Low (Note 2)
-150
mV
Output Voltage High (Note 2)
150
mV
Prescaler Ratio
Reference Divider Ratio
8
8
Charge-Pump Output High
Measured at FB
0.08
0.1
0.12
CONDITIONS
Referenced to V
CMI
Referenced to V
CMI
R
SOURCE
= 50k
, V
FLCLK
= 1.65V
Referenced to V
CMO
, LOBUFSEL
0.5V
Referenced to V
CMO
, LOBUFSEL
0.5V
V
CPG1
0.5V, V
CPG2
0.5V
(V
MOD+
- V
MOD-
)
200mV, LOBUFSEL 0.5V
32
32
LOBUFSEL
2.4V, LODIVSEL 0.5V
LOBUFSEL
2.4V, LODIVSEL 2.4V
(V
MOD+
- V
MOD-
)
-200mV, LOBUFSEL 0.5V
2
2
1
1
33
33
FREQUENCY SYNTHESIZER/LO BUFFER
DIFFERENTIAL DIGITAL OUTPUTS (LOBUF+/PSOUT+, LOBUF-/PSOUT-)
DIFFERENTIAL DIGITAL INPUTS (MOD+, MOD-, PLLIN+, PLLIN-)
SLEW-RATE-LIMITED DIGITAL INPUT (f
LCLK
)
STANDARD DIGITAL INPUTS (INSEL, CPG1, CPG2, LOBUFSEL, LODIVSEL)
MAX2106
DBS Direct Downconverter
_______________________________________________________________________________________
3
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +4.75V to +5.25V, V
FB
= +2.4V, C
IOUT_
= C
QOUT_
= 10pF,
FLCLK
= 2MHz, RFIN_ = unconnected, R
IOUT_
= R
QOUT_
= 10k
,
V
LOBUFSEL
= 0.5V, V
RFBAND
= V
INSEL
= V
CPG1
= V
CPG2
= +2.4V, V
PLLIN+
= V
MOD+
= +1.3V, V
PLLIN-
= V
MOD-
= +1.1V, T
A
= +25C,
unless otherwise noted. Typical values are at V
CC
= +5V, unless otherwise noted.)
AC ELECTRICAL CHARACTERISTICS
(IC driven single-ended with RFIN- AC-terminated in 75
to GND, V
CC
= +4.75V to +5.25V, V
IOUT_
= V
QOUT_
= 0.59Vp-p,
C
IOUT_
= C
QOUT_
= 10pF,
LCLK
= 2MHz, R
IOUT_
= R
QOUT_
= 10k
, V
LOBUFSEL
= 0.5V, V
RFBAND
= V
INSEL
= V
CPG1
= V
CPG2
= +2.4V,
V
PLLIN+
= V
MOD+
= +1.3V, V
PLLIN-
= V
MOD-
= +1.1V, T
A
= +25C, unless otherwise noted. Typical values are at V
CC
= +5V.)
V
CPG1
0.5V, V
CPG2
0.5V
V
CPG1
0.5V, V
CPG2
2.4V
CONDITIONS
-0.12
-0.1
-0.08
Charge-Pump Output Low
Measured at FB
-0.36
-0.3
-0.24
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
V
CPG1
2.4V, V
CPG2
0.5V
V
CPG1
2.4V, V
CPG2
2.4V
-0.72
-0.6
-0.48
mA
-2.16
-1.8
-1.44
V
GC_
= 1V to 4V
-50
50
I
GC_
Input Current
A
Charge-Pump Output Current
Matching Positive to Negative
%
Measured at FB
-5
5
Charge-Pump Output Leakage
nA
Measured at FB
-25
25
Offset Voltage (Note 1)
mV
Differential Output Voltage
Swing
Vp-p
R
L
= 2k
differential
1
Common-Mode Output Voltage
(Note 1)
V
0.65
0.85
-50
50
Charge-Pump Output Current
Drive (Note 1)
A
Measured at CP
100
f
RFIN_
RFIN_ Input Frequency Range
MHz
CONDITIONS
NF
Noise Figure
dB
f
RFIN_
= 1550MHz,
V
GC1
= 1V, V
GC2
adjusted 0.59Vp-p
baseband level
10.2
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
Inferred by quadrature gain and
phase-error test
925
2175
dBm
RFIN_ Input Power for 0.59Vp-p
Baseband Levels
dBm
-25
Single
carrier
-68
IP3
RFIN_
RFIN_ Input Third-Order Intercept
Point (Note 3)
dBm
P
RFIN_
= -25dBm
per tone
10.5
10.5
11.5
IP2
RFIN_
RFIN_ Input Second-Order Intercept
(Note 4)
dBm
P
RFIN_
= -25dBm per tone,
f
LO
= 951MHz
17
P1
dBOUT
Output-Referred 1dB Compression
Point (Note 5)
dBV
P
RFIN_
= -40dBm,
signals within filter bandwidth
2
ANALOG CONTROL INPUTS (GC1, GC2)
BASEBAND OUTPUTS (IOUT+, IOUT-, QOUT+, QOUT-)
V
GC1
= V
GC2
= +4V (min gain)
V
GC1
= V
GC2
= +1V (max gain)
f
LO
= 2175MHz
f
LO
= 1550MHz
f
LO
= 950MHz
dBm
P
RFIN_
= -65dBm
per tone
-30
-29
-26
f
LO
= 2175MHz
f
LO
= 1550MHz
f
LO
= 950MHz
RF FRONT END
P
RFIN_
= -65dBm
dB
44.8
P
RFIN_
= -25dBm
MAX2106
DBS Direct Downconverter
4
_______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS (continued)
(R
FIN
+ IC driven single-ended with RFIN- AC-terminated in 75
to GND, V
CC
= +4.75V to +5.25V, V
IOUT_
= V
QOUT_
= 0.59Vp-p,
C
IOUT_
= C
QOUT_
= 10pF, f
LCLK
= 2MHz, R
IOUT_
= R
QOUT_
= 10k
, V
LOBUFSEL
= 0.5V, V
RFBAND
= V
INSEL
= V
CPG1
= V
CPG2
= +2.4V,
V
PLLIN+
= V
MOD+
= +1.3V, V
PLLIN-
= V
MOD-
= +1.1V, T
A
= +25C, unless otherwise noted. Typical values are at V
CC
= +5V.)
12.5
f = 925MHz
dB
RFOUT Noise Figure (Note 10)
5
7
9
f = 925MHz
dBm
RFOUT Output Third-Order Intercept
Point (Note 10)
1.0
f = 1550MHz
2.0
f = 2175MHz
0.5
f = 925MHz
dB
RFIN+ to RFOUT Gain (Note 10)
degrees
Quadrature Phase Error
Includes effects from baseband filters,
measured at 125kHz baseband
4
dB
Quadrature Gain Error
Includes effects from baseband filters,
measured at 125kHz baseband
f
FLCLK
= 2.0625MHz, f
C
= 31.4MHz
f
FLCLK
= 1.25MHz, f
C
= 19.3MHz
f
FLCLK
= 0.5MHz, f
C
= 8MHz
-0.5
0.5
Deviation from ideal 7th order,
Butterworth, up to 0.7
f
C
dB
Baseband Frequency Response
(Note 1)
750
C
IDC_
= C
QDC_
= 0.22F
Hz
Baseband Highpass -3dB Frequency
(Note 1)
23
f
IN_BAND
= 100Hz to 22.5MHz,
f
OUT_BAND
= 67.5MHz to 112.5MHz
1.2
dB
Ratio of In-Filter-Band to Out-of-Filter-
Band Noise
R
FIN
+ Return Loss (Note 6)
+13
dB
10
10
%
LPF -3dB Cutoff-Frequency
Accuracy (Note 1)
-10
10
-5.5
5.5
f
RFIN_
= 925MHz, Z
SOURCE
= 75
8
33
Controlled by FLCLK signal
MHz
LPF -3dB Cutoff-Frequency Range
(Note 1)
12
925MHz < f < 2175MHz, Z
LOAD
= 75
dB
RFOUT Return Loss (Notes 6, 10)
11
f = 2175MHz
11
f = 1550MHz
f = 2175MHz
f = 1550MHz
50
IOUT_, QOUT_
Output Real Impedance (Note 1)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
CONDITIONS
+14
f
RFIN_
= 2175MHz, Z
SOURCE
= 75
41.5
LO 2nd Harmonic Rejection (Note 7)
32
dB
Average level of V
IOUT_
, V
QOUT_
Average level of V
IOUT_
, V
QOUT_
LO Half Harmonic Rejection (Note 8)
dB
-66
Measured at R
FIN
+
LO Leakage Power (Notes 6, 9)
dBm
RFOUT PORT (LOOPTHROUGH)
BASEBAND CIRCUITS
MAX2106
DBS Direct Downconverter
_______________________________________________________________________________________
5
Note 1:
Minimum and maximum values are guaranteed by design and characterization over supply voltage.
Note 2
Driving differential load of 10k
|| 15pF.
Note 3:
Two signals are applied to RFIN_ at f
LO
- 100MHz and f
LO
- 199MHz. V
GC2
= 1V, V
GC1
is set so that the baseband out-
puts are at 590mVp-p. IM products are measured at baseband outputs but are referred to RF inputs.
Note 4:
Two signals are applied to RFIN_ at 1200MHz and 2150MHz. V
GC2
= 1V, V
GC1
is set so that the baseband outputs are at
590mVp-p. IM products are measured at baseband outputs but are referred to RF inputs.
Note 5:
P
RFIN_
= -40dBm so that front-end IM contributions are minimized.
Note 6:
Using L64733/L64734 demo board from LSI Logic.
Note 7:
Downconverted level, in dBc, of carrier present at f
LO
2, f
LO
= 1180MHz, f
VCO
= 590MHz, V
RFBAND
= unconnected (see
histogram plots).
Note 8:
Downconverted level, in dBc, of carrier present at f
O
/ 2, f
LO
= 2175MHz, f
VCO
= 1087.5MHz, V
RFBAND
= 2.4V.
Note 9:
Leakage is dominated by board parasitics.
Note 10: V
CPG1
= V
CPG2
= V
RFBAND
= V
INSEL
= 0.5V,
LCLK
= 0.5MHz.
Note 11: Guaranteed by design and characterization over supply and temperature.
Note 12: Measured at tuned frequency with PLL locked. PLL loop bandwidth = 3kHz. All phase noise measurements assume tank
components have a Q > 50.
AC ELECTRICAL CHARACTERISTICS (continued)
(IC driven single-ended with RFIN- AC-terminated in 75
to GND, V
CC
= +4.75V to +5.25V, V
IOUT_
= V
QOUT_
= 0.59Vp-p,
C
IOUT_
= C
QOUT_
= 10pF,
LCLK
= 2MHz, R
IOUT_
= R
QOUT_
= 10k
, V
LOBUFSEL
= 0.5V, V
RFBAND
= V
INSEL
= V
CPG1
= V
CPG2
= +2.4V,
V
PLLIN+
= V
MOD+
= +1.3V, V
PLLIN-
= V
MOD-
= +1.1V, T
A
= +25C, unless otherwise noted. Typical values are at V
CC
= +5V.)
LOCAL OSCILLATOR
SYNTHESIZER
-96
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
At 100kHz offset, f
LO
= 2175MHz
dBc/Hz
LO Phase Noise (Notes 6, 12)
-75
At 10kHz offset, f
LO
= 2175MHz
58
0
Figure 1
f
RFIN
= 2175MHz
dB
RFIN+ to LO Input Isolation (Note 9)
-60
590
1180
MHz
LO Tuning Range (Note 11)
ns
4
7.26
MHz
Crystal Frequency Range (Note 1)
0.75
1
1.5
Load = 10pF | | 10k
, f
XTLOUT
= 6MHz
Vp-p
XTLOUT Output Voltage Swing
At 1kHz offset, f
LO
= 2175MHz
MOD+, MOD- Hold Time (Note 1)
t
HM
7
Figure 1
CONDITIONS
ns
MOD+, MOD- Setup Time (Note 1)
t
SUM
70
V
LOBUFSEL
2.4V,
f
LO
= 925 MHz + 2175MHz
V
RMS
LO Buffer Output Voltage (Note 1)
SYNTHESIZER
LOCAL OSCILLATOR