THS7364IPW datasheet(27/47 Pages) TI

27 / 47 page

External

Input/Output

Internal

Circuitry

THS7364

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SBOS530 – AUGUST 2010

APPLICATION INFORMATION

coefficient capacitors. The design of the THS7364

The THS7364 is targeted for six-channel video output

allows

operation

down

2.6

but

applications that require three standard-definition

recommended to use at least a 3-V supply to ensure

(SD) video output buffers and three full-high definition

that no issues arise with headroom or clipping with

(FHD) video output buffers. Although it can be used

100% color-saturated CVBS signals. If only 75% color

for numerous other applications, the needs and

saturated CVBS is supported, then the output voltage

requirements of the video signal are the most

requirements are reduced to 2 VPP on the output,

important design parameters of the THS7364. Built

allowing a 2.7-V supply to be utilized without issues.

the

revolutionary,

complementary

Silicon

Germanium (SiGe) BiCom3X process, the THS7364

A 0.1-mF to 0.01-mF capacitor should be placed as

incorporates many features not typically found in

close as possible to the power-supply pins. Failure to

integrated video parts while consuming very low

do so may result in the THS7364 outputs ringing or

power. The THS7364 includes the following features:

oscillating. Additionally, a large capacitor (such as

22 mF to 100 mF) should be placed on the

•

Single-supply 2.7-V to 5-V operation with low total

power-supply

line

minimize

interference

with

quiescent current of 23.4 mA at 3.3 V and

50-/60-Hz line frequencies.

24.5 mA at 5 V

•

Disable mode allows for shutting down individual

INPUT VOLTAGE

SD/FHD blocks of amplifiers to save system

power in power-sensitive applications

The THS7364 input range allows for an input signal

range from –0.2 V to approximately (VS+ – 1.5 V).

•

Input configuration accepting dc + level shift, ac

However, because of the internal fixed gain of 2 V/V

sync-tip clamp, or ac-bias

(+6 dB) and the internal input level shift of 150 mV

–

AC-biasing is allowed with the use of external

(typical), the output is generally the limiting factor for

pull-up resistors to the positive power supply

the allowable linear input range. For example, with a

•

Sixth-order, low-pass filter for DAC reconstruction

5-V supply, the linear input range is from –0.2 V to

or ADC image rejection:

3.5 V. However, because of the gain and level shift,

–

9.5 MHz for NTSC, PAL, SECAM, composite

the linear output range limits the allowable linear

video

(CVBS),

S-Video

Y’/C’,

480i/576i,

input range to approximately –0.1 V to 2.3 V.

Y’/P’B/P’R, and G’B’R’ (R’G’B’) signals

–

72-MHz for 1080p60 Y’/P’ B/P’R or G’B’R’

INPUT OVERVOLTAGE PROTECTION

signals; also allows up to QXGA (1600 × 1200

The THS7364 is built using a very high-speed,

at 60 Hz) R'G'B' video in filter bypass mode

complementary, bipolar, and CMOS process. The

•

Individually-controlled Bypass mode bypasses the

internal junction breakdown voltages are relatively

low-pass

filters

for

each

SD/FHD

block

low for these very small geometry devices. These

amplifiers

breakdowns are reflected in the Absolute Maximum

–

SD bypass mode features 150-MHz and

Ratings table. All input and output device pins are

100-V/ms performance

protected with internal ESD protection diodes to the

–

FHD bypass mode features 350-MHz and

power supplies, as shown in Figure 76.

500-V/ms performance

•

Individually-controlled Disable mode shuts down

all amplifiers in each SD/FHD block to reduce

quiescent current to 0.1 mA

•

Internally-fixed gain of 2-V/V (+6-dB) buffer that

can drive two video lines with dc-coupling or

traditional ac-coupling

•

Flow-through configuration using a TSSOP-20

package that complies with the latest lead-free

(RoHS-compatible)

and

green

manufacturing

requirements

Figure 76. Internal ESD Protection

OPERATING VOLTAGE

These diodes provide moderate protection to input

The THS7364 is designed to operate from 2.7 V to

overdrive voltages above and below the supplies as

5 V over the –40°C to +85°C temperature range. The

well. The protection diodes can typically support

impact on performance over the entire temperature

30 mA of continuous current when overdriven.

range is negligible as a result of the implementation

of thin film resistors and high-quality, low-temperature

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