Rainbow Electronics MAX3580 - Manual (Page 4)

MAX3580
Direct-Conversion TV Tuner
4 _______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX3580 EV kit, V CC = +3.1V to +3.5V, GND = 0V. RF_AGC = BB_AGC = +2.85V, RF input terminated into a 75Ω load, BBI_ and
BBQ_ loaded by R L greater than 2kΩ and C L less than 10pF, VCO active, registers are set according to the recommended default
register conditions, T A = -40°C to +85°C, unless otherwise noted. Typical values are at V CC = +3.3V, T A = +25°C, unless otherwise
noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SIGMA-DELTA FRACTIONAL-N SYNTHESIZER
REFERENCE OSCILLATOR
Frequency f REF 4 27 MHz
Input Impedance Z IN 10 k Ω
Voltage Gain 30 V/V
Output Impedance Z OUT 15 Ω
Buffered Output 10k Ω || 10pF load 0.7 V
P-P
DIVIDERS
RF N Divider Ratio 5 251 —
RF R Divider Ratio 1 2 —
Fractional-N Resolution 20 Bits
LO PHASE DETECTOR AND CHARGE PUMP
Phase-Detector Frequency 4 27 MHz
Gain = 0 600
Charge-Pump Current I CP
Gain = 1 1200
µA
Charge-Pump Tri-State Current -10 +10 µA
Charge-Pump Compliance
Range Charge-pump positive to negative current
matching of
≤ ±5%
0.4
V
CC
-
0.4
V
LOCAL OSCILLATOR
Tuning Frequency Range f OSC Tank Frequency 2160 4400 MHz
VCO Dividers 4 16 —
BASEBAND STAGE
Nominal Output Voltage (Note 2) 1 V P-P
1dB Output Compression Point P 1dB Differential voltage at 3MHz 1.6 2 V P-P
Output Impedance Differential 60 Ω
Passband AGC Range BB_AGC = 0.5V to 2.85V 30 50 dB
Passband Cutoff Attenuation
At 3.8MHz (UHF Mode);
at 3.325MHz (VHF Mode)
2 5 dB
Passband Differential Gain Error
2MHz to 3.8MHz, I channel vs. Q channel
(UHF mode)
-0.45 +0.45 dB
Passband Group Delay
From DC to 3.8MHz over any 1.1kHz band
(UHF mode)
5 ns
Group Delay Mismatch
From 0.1MHz to 3.8MHz, I channel vs. Q
channel (UHF mode) (Note 9)
< 2 ns