Datasheet
MAX3845
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
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5
DIFFERENTIAL-INPUT RETURN LOSS
vs. FREQUENCY
MAX3845 toc10
FREQUENCY (MHz)
GAIN (dB)
25002000500 1000 1500
-35
-30
-25
-20
-15
-10
-5
0
-40
0 3000
TEMP VOLTAGE
vs. JUNCTION TEMPERATURE
MAX3845 toc11
JUNCTION TEMPERATURE (°C)
TEMP (V)
13011010 30 50 70 90
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
0.8
-10 150
POWER DISSIPATION
vs. AMBIENT TEMPERATURE
MAX3845 toc12
AMBIENT TEMPERATURE (°C)
POWER DISSIPATION (mW)
80655035205
500
1000
1500
2000
2500
3000
0
-10
ALL INPUTS/OUTPUTS ACTIVE,
PREEMPHASIS SAME ON ALL
OUTPUT CHANNELS
0dB PREEMPHASIS
OUT_LEVEL = LOW
6dB PREEMPHASIS
OUT_LEVEL = HIGH
Typical Operating Characteristics (continued)
(Typical values are at V
CC
= +3.3V, T
A
= +25°C, data pattern = 2
10
- 1 PRBS + 20 ones + 2
10
- 1 PRBS (inverted) + 20 zeros, unless
otherwise noted.)
Pin Description
PIN NAME FUNCTION
1, 4, 7, 10,
97, 100
V
CC1
Positive Power-Supply Connection. Powers input channel 1 and output channels 1 and 2.
2, 5, 8, 98
IN1_B+,
IN1_C+,
IN1_D+,
IN1_A+
Noninverting TMDS CML Input, Channel 1
3, 6, 9, 99
IN1_B-,
IN1_C-,
IN1_D-,
IN1_A-
Inverting TMDS CML Input, Channel 1
11 PWRDWN_1
Power-Down, LVTTL/LVCMOS Input. Force high or leave open to power down input channel 1. Force
low to enable input channel 1. The MAX3845 powers down if both PWRDWN_1 and PWRDWN_2 are
forced high or left open.
12 V
CC3
Positive Power-Supply Connection. Powers the temp-sense circuitry.
13 LOSMUTE_EN
LOS MUTE Enable Input. Connect to V
CC
for typical operation. Connect to GND to disable the LOS
MUTE function.
14 TEMP
Junction Temperature Sensor. Attach a ground-referenced voltage DMM to this pin to measure the
die’s junction temperature (see the V
CC3
pin description). Leave open if not used.
15 PWRDWN_2
Power-Down, LVTTL/LVCMOS Input. Force high or leave open to power down input channel 2. Force
low to enable input channel 2. The MAX3845 powers down if both PWRDWN_1 and PWRDWN_2 are
forced high or left open.
16, 19, 22,
25, 26, 29
V
CC2
Positive Power-Supply Connection. Powers input channel 2 and output channels 3 and 4.