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General Description

The MAX4028/MAX4029 are 5V, triple/quad, 2:1 voltage-

feedback multiplexer-amplifiers with input clamps and a

fixed gain of +2V/V (6dB). Channel 1 (IN1A and IN1B)

inputs are clamped to the video sync tip of the input sig-

nal, while the remaining inputs can be clamped to either

the video sync tip or the video sync of channel 1 (IN1_).

The latter is referred to as a key clamp and is pin selec-

table. Selectable clamp/key-clamp inputs and fixed-gain

video output buffers make the MAX4028/MAX4029 ideal

for video-source switching applications such as automo-

tive entertainment systems, video projectors, and dis-

plays/TVs. Both devices have 20ns channel switching

times and low ±10mV

P-P

switching transients, making

them ideal for high-speed video switching applications

such as on-screen display (OSD) insertion.

The MAX4028/MAX4029 have a -3dB large-signal (2V

P-P

)

bandwidth of 130MHz, a -3dB small-signal bandwidth of

210MHz, and a 300V/µs slew rate. Low differential gain

and phase errors of 0.2% and 0.4°, respectively, make

these devices ideal for broadcast video applications.

The MAX4028/MAX4029 are specified over the -40°C to

+85°C extended temperature range and are offered in

16-pin and 20-pin TSSOP/SO packages.

Applications

In-Car Navigation/Entertainment

Blade Servers

Security Systems

Video Projectors

Displays and Digital Televisions

Broadcast and Graphics Video

Set-Top Boxes

Notebook Computers

Video Crosspoint Switching

Features

♦ Single +5V Operation

♦ Independently Selectable Sync-Tip or

Key-Clamp Inputs

♦ Adjustable Key-Clamp Voltage

♦ 130MHz Large-Signal -3dB Bandwidth

♦ 210MHz Small-Signal -3dB Bandwidth

♦ 300V/µs Slew Rate

♦ 20ns Switching Time

♦ Ultra-Low ±10mV

P-P

Switching Transient

♦ 0.2% Differential Gain/0.4° Phase Error

♦ Low-Power, High-Impedance Disable Mode

MAX4028/MAX4029

Triple/Quad, 2:1 Video

Multiplexer-Amplifiers with Input Clamps

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

MAX4028

MAX4029

75Ω

IN1A

OUT1

CLAMP

A/B

+5V

0.1µF

0.01µF

0.1µF

1kΩ

0.1µF

IN1B

CLAMP

75Ω

IN2A

OUT2

DISABLE

CLAMP/KEY_2

CLAMP

0.1µF

KEYREF

6kΩ

1kΩ

0.1µF

IN2B

KEYREF

CLAMP

KEY/CLAMP

CONTROL

75Ω CABLE

75Ω

75Ω CABLE

75Ω

75Ω CABLE

Typical Operating Circuit

19-3240; Rev 0; 3/04

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.

Pin Configurations appear at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX4028EUE -40°C to +85°C 16 TSSOP

MAX4028EWE -40°C to +85°C 16 Wide SO

MAX4029EUP -40°C to +85°C 20 TSSOP

MAX4029EWP -40°C to +85°C 20 Wide SO

Selector Guide

PART

NO. OF 2:1

MUX-AMPS

GAIN

MAX4028 3 2V/V

MAX4029 4 2V/V

Summary of content (13 pages)

PAGE 1
9-3240; Rev 0; 3/04 Triple/Quad, 2:1 Video Multiplexer-Amplifiers with Input Clamps The MAX4028/MAX4029 are 5V, triple/quad, 2:1 voltagefeedback multiplexer-amplifiers with input clamps and a fixed gain of +2V/V (6dB). Channel 1 (IN1A and IN1B) inputs are clamped to the video sync tip of the input signal, while the remaining inputs can be clamped to either the video sync tip or the video sync of channel 1 (IN1_). The latter is referred to as a key clamp and is pin selectable.
PAGE 2
MAX4028/MAX4029 Triple/Quad, 2:1 Video Multiplexer-Amplifiers with Input Clamps ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to GND) ..................................-0.3V to +6V IN_A, IN_B, OUT_.......................................-0.3V to (VCC + 0.3V) DISABLE, A/B, KEYREF, CLAMP/KEY_......-0.3V to (VCC + 0.3V) Current Into IN_A, IN_B ...................................................±0.5mA Short-Circuit Duration (VOUT to GND)........................Continuous Short-Circuit Duration (VOUT to VCC) ....
PAGE 3
Triple/Quad, 2:1 Video Multiplexer-Amplifiers with Input Clamps (VCC = +5V, GND = 0V, RL = 150Ω to GND, VDISABLE = +5V, RKEYREF = 6kΩ, CIN = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Small-Signal -3dB Bandwidth BWSS VOUT = 100mVP-P 210 MHz Large-Signal -3dB Bandwidth BWLS VOUT = 2VP-P 130 MHz Small-Signal 0.1dB Gain Flatness Bandwidth BW0.1dBSS VOUT = 100mVP-P 30 MHz Large-Signal 0.
PAGE 4
Typical Operating Characteristics (VCC = +5V, GND = 0V, VDISABLE = +5V, RL = 150Ω to GND, CIN = 0.1µF, RKEYREF = 6.04kΩ ±1%, TA = +25°C, unless otherwise noted.) 6.2 5 4 3 2 1 6.0 5.8 5.7 5.6 5.5 5.4 -1 5.3 -2 8 1M 10M 100M 1G 6 5 4 3 2 1 0 -1 -2 100k 1M 10M 1G 100M 100k 1M 100M FREQUENCY (Hz) LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY DIFFERENTIAL GAIN AND PHASE POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 5.9 5.8 5.7 5.6 5.5 5.4 5.
PAGE 5
Triple/Quad, 2:1 Video Multiplexer-Amplifiers with Input Clamps OUTPUT IMPEDANCE vs. FREQUENCY INPUT-VOLTAGE NOISE DENSITY vs. FREQUENCY 1 MAX4028 toc12 0.1 MAX4028 toc11 MAX4028 toc10 10 LARGE-SIGNAL TRANSIENT RESPONSE 1000 INPUT-VOLTAGE NOISE DENSITY (nV/√Hz) OUTPUT IMPEDANCE (Ω) 100 VIN 500mV/div 1.
PAGE 6
Typical Operating Characteristics (continued) (VCC = +5V, GND = 0V, VDISABLE = +5V, RL = 150Ω to GND, CIN = 0.1µF, RKEYREF = 6.04kΩ ±1%, TA = +25°C, unless otherwise noted.) KEY-CLAMP REFERENCE VOLTAGE vs. RKEYREF CLAMP VOLTAGE vs. TEMPERATURE 0.41 0.40 0.39 0.38 MAX4028 toc20 0.42 1.8 KEY-CLAMP REFERENCE VOLTAGE (V) MAX4028 toc19 0.43 CLAMP VOLTAGE (V) MAX4028/MAX4029 Triple/Quad, 2:1 Video Multiplexer-Amplifiers with Input Clamps 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0.
PAGE 7
Triple/Quad, 2:1 Video Multiplexer-Amplifiers with Input Clamps PIN NAME MAX4028 MAX4029 15 18 OUT1 16 19 DISABLE — 20 CLAMP/KEY_4 FUNCTION Amplifier Output 1 Disable Input. Pull DISABLE high for normal operation. Drive DISABLE low to disable all outputs. Output 4 Clamp or Key-Clamp Input. Drive CLAMP/KEY_4 high to clamp OUT4. Drive CLAMP/KEY_4 low to key clamp OUT4.
PAGE 8
Therefore, a 6kΩ resistor will produce a 1.13V keyclamp voltage as shown in Figure 2. The clamp voltage (VCLAMP) is measured at the output; the voltage at the input is VCLAMP (sync tip or key clamp) divided by the gain (+2V/V) + VBE. In order for these clamps (sync tip or key) to work properly, the input must be coupled with a 0.1µF capacitor (typ) with low leakage (<1µA to 2µA, max).
PAGE 9
Triple/Quad, 2:1 Video Multiplexer-Amplifiers with Input Clamps INPUT FORMAT CLAMP/KEY INPUT FORMAT CLAMP/KEY 1 Cvbs1 Clamp 1 Gs Clamp 2 Cvbs2 Clamp 2 R Key 3 Cvbs3 Clamp 3 B Key 4 Cvbs4 Clamp 4 Cvbs Clamp MAX4028/MAX4029 Table 2. MAX4029 Clamp Settings for Video Formats Gs, B, R have sync only on Green. INPUT FORMAT CLAMP/KEY INPUT FORMAT CLAMP/KEY 1 H-Sync Clamp 2 G Key 1 Y Clamp 2 Pr 3 B Key Key 3 Pb Key 4 R R, G, B have sync on none.
PAGE 10
SMALL-SIGNAL BANDWIDTH vs. FREQUENCY OPTIMAL ISOLATION RESISTANCE vs. CAPACITIVE LOAD CLOAD = 10pF 8 7 6 5 4 CLOAD = 5pF 3 2 1 1M 10M 100M 1G A/B DISABLE 5 50 100 150 200 250 Figure 6. Optimal Isolation Resistance vs. Capacitive Load Layout and Power-Supply Bypassing IN_A OUT_ RISO CL RL 0.1µF IN_B CLAMP MAX4028 MAX4029 Figure 5.
PAGE 11
Triple/Quad, 2:1 Video Multiplexer-Amplifiers with Input Clamps directly from the capacitor to the VCC pin. To minimize parasitic inductance, keep PC traces short and use surface-mount components. If input termination resistors and output back-termination resistors are used, they should be surface-mount types, and should be placed as close to the IC pins as possible.
PAGE 12
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) TSSOP4.40mm.
PAGE 13
Triple/Quad, 2:1 Video Multiplexer-Amplifiers with Input Clamps E DIM A A1 B C e E H L H MAX MIN 0.104 0.093 0.012 0.004 0.019 0.014 0.013 0.009 0.050 0.299 0.291 0.394 0.419 0.050 0.016 SOICW.EPS INCHES N MILLIMETERS MIN 2.35 0.10 0.35 0.23 MAX 2.65 0.30 0.49 0.32 1.27 7.40 7.60 10.00 10.65 0.40 1.27 VARIATIONS: 1 INCHES TOP VIEW DIM D D D D D D A B e MIN 0.398 0.447 0.496 0.598 0.697 MAX 0.413 0.463 0.512 0.614 0.713 MILLIMETERS MIN 10.10 11.35 12.60 15.20 17.70 MAX 10.50 11.75 13.