User Manual

MAX3541
Complete Single-Conversion
Television Tuner
4 _______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX3541 EV kit, V
CC
= +3.1V to +3.5V, T
A
= -40°C to +85°C, 75Ω system impedance, default register settings, V
RFAGC
= V
IFAGC
=
+3V (minimum attenuation), unless otherwise noted. Typical values are at V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Maximum gain setting
(V
IFAGC
= 3V)
54 59 63
Passband Voltage Gain
S our ce l oad =
1.1kΩ,
output load = 1kΩ
Minimum gain setting
(V
IFAGC
= 0.5V)
21
dB
Passband Gain Flatness 32MHz to 40MHz (Note 1) 1.2 dB
Output Voltage V
IFAGC
= 3V (Note 1) 2.5 V
P-P
AGC Gain Slope V
IFAGC
= 3V to 0.5V (Note 1) 27 dB/V
Equivalent Input Voltage Noise Density
At 36MHz, maximum gain (V
IFAGC
= 3V)
(Note 1)
7.3 nV/√Hz
Noise Figure Change vs. Attenuation < 0.35 dB/dB
IM3 V
OUT
= 1V
P-P
, 40dB < gain < 60dB (Note 1) -56 dBc
IF OVERLOAD DETECTOR (See the IF Overload Detector Section)
Output Overload Attack Point 0.7 V
P-P
Attack Point Accuracy OD REG = 3 ±1 dB
Detector Output Voltage Range
Negative polarity, overload reduces V
DET
(open collector, 0.3mA sink)
0.5 3.0 V
Detector Gain 70 V/V
FREQUENCY SYNTHESIZER
REFERENCE OSCILLATOR
Frequency 8 MHz
DIVIDERS
RF N-Divider Ratio 256 32,767
RF R-Divider Ratio 16 127
LO PHASE DETECTOR AND CHARGE PUMP
Comparison Frequency 63 250 kHz
CP = 00 0.5
CP = 01 1
CP = 10 1.5
Charge-Pump Current
CP = 11 2
mA
Charge-Pump Three-State Current ±5 nA
Charge-Pump Compliance Range 0.4
V
CC
-
0.4
V
Charge-Pump Current Matching 5%
LOCAL OSCILLATOR
VCO Tuning Range Tank frequency 2200 4400 MHz
VCO Tuning Gain Tank oscillator gain 500 MHz/V
2-WIRE SERIAL INTERFACE
Clock Frequency 400 kHz
Note 1: Guaranteed by design and characterization.