MAX2104(2001) データシートの表示（PDF） - Maxim Integrated
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MAX2104 Datasheet PDF : 9 Pages
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Direct-Conversion Tuner IC for
Digital DBS Applications
Pin Description
PIN
1, 6, 19,
29, 39, 45
2
3
4
5, 9, 10,
15, 16, 32,
40, 41, 46
7
8
11
12
13
14
17
NAME
VCC
CFLT
XTL-
XTL+
GND
RFIN-
RFIN+
QDC-
QDC+
IDC-
IDC+
RFOUT
18
CPG1
20
XTLOUT
21
CPG2
22
GC1
23
GC2
24
INSEL
25
FLCLK
26
FDOUB
27
QOUT-
28
QOUT+
30
IOUT-
31
IOUT+
FUNCTION
VCC Power-Supply Input. Connect each pin to a +5V ±5% low-noise supply. Bypass each VCC pin to the
nearest GND with a ceramic chip capacitor.
External Bypass for Internal Bias. Bypass this pin with a 0.1µF ceramic chip capacitor to GND.
Inverting Input to Crystal Oscillator. Consult crystal manufacturer for circuit loading requirements.
Noninverting Input to Crystal Oscillator. Consult crystal manufacturer for circuit loading requirements.
Ground. Connect each of these pins to a solid ground plane. Use multiple vias to reduce inductance
where possible.
RF Inverting Input. Bypass RFIN- with 47pF capacitor in series with a 75Ω resistor to GND.
RF Noninverting Input. Connect to 75Ω source with a 47pF ceramic chip capacitor.
Baseband Offset Correction. Connect a 0.22µF ceramic chip capacitor from QDC- to QDC+ (pin 12).
Baseband Offset Correction. Connect a 0.22µF ceramic chip capacitor from QDC+ to QDC- (pin 11).
Baseband Offset Correction. Connect a 0.22µF ceramic chip capacitor from IDC- to IDC+ (pin 14).
Baseband Offset Correction. Connect a 0.22µF ceramic chip capacitor from IDC+ to IDC- (pin 13).
Buffered RF Output. Enabled when INSEL is low.
Charge-Pump Gain Select. High-impedance digital input. Sets the charge-pump output scaling. See the
DC Electrical Characteristics section for available gain settings.
Buffered Crystal Oscillator Output
Charge-Pump Gain Select. High-impedance digital input. Sets the charge-pump output scaling. See the
DC Electrical Characteristics section for available gain settings.
Gain Control Input for RF Front End. High-impedance analog input, with an input range of 1V to 4V. See
the AC Electrical Characteristics section for transfer function.
Gain Control Input for Baseband Signals. High-impedance analog input, with an input range of 1V to 4V.
See the AC Electrical Characteristics section for transfer function.
Loopthrough Mode Enable. High-impedance digital input. Drive low to enable the RFOUT buffer and
disable the internal downconverters. Connect to VCC for normal tuner operation.
Baseband Filter Cutoff Adjust. Connect to a slew-rate-limited clock source. See the AC Electrical
Characteristics section for transfer function.
LO Frequency Doubler. High-impedance digital input. Drive high to enable the LO frequency doubler.
Drive low to disable the doubling function.
Baseband Quadrature Output. Connect to inverting input of high-speed ADC.
Baseband Quadrature Output. Connect to noninverting input of high-speed ADC.
Baseband In-Phase Output. Connect to inverting input of high-speed ADC.
Baseband In-Phase Output. Connect to noninverting input of high-speed ADC.
33
MOD+
PECL Modulus Control. A PECL high on MOD+ sets the dual-modulus prescaler to divide by 32. A PECL
logic low sets the divide ratio to 33. Drive with a differential PECL signal with MOD- (pin 34).
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