ISL59111IIZ-T7 - Intersil Corporation

FN6172.4

ISL59111

8MHz Rail-to-Rail Composite Video Driver

The ISL59111 is a single rail-to-rail 3-pole output

reconstruction filter with a -3dB roll-off frequency of 8MHz

and a slew rate of 40V/µs, with input signal DC restoration

accomplished with an internal sync tip clamp. Operating

from single supplies ranging from +2.5V to +3.6V and

sinking an ultra-low 2mA quiescent current, the ISL59111 is

ideally suited for low power , battery-operated applications. It

also features inputs capable of reaching down to 0.15V

below the negative rail. Additionally , an enable high pin shuts

the part down in under 14ns.

The ISL59111 is designed to meet the needs for very low

power and bandwidth required in battery-operated

communication, instrumentation, and modern industria l

applications such as video on demand, cable set-top boxes,

DVD players, and HDTV. The ISL59111 is offered in a

space-saving CSP package guaranteed to a 0.7mm

maximum height constraint and specified for operation from

-40°C to +85°C temperature range.

Features

• 3rd order 8MHz reconstruction filter

• 40V/µs slew rate

• Low supply current = 2mA

• Power-down current less than 3µA

• Supplies from 2.5V to 3.6V

• Rail-to-rail output

• Input to 0.15V below VS-

• Input sync tip clamp

• SAG correction reduces AC coupling capacitor size

• Pb-free plus anneal available (RoHS compliant)

Applications

• Video amplifiers

• Portable and handheld products

• Communications devices

• Video on demand

• Cable set-top boxes

• Satellite set-top boxes

• DVD players

• HDTV

• Personal video recorders

Ordering Information

PART

NUMBER

(See Note) PART

MARKING TAPE &

REEL PACKAGE

(Pb-Free) PKG.

DWG. #

ISL591 11IZ-T7 1 11Z 7” (3k pcs) 6 Ld CSP (2x3) MDP0054

NOTE: Intersil Pb-free plus anneal products employ special Pb-free

material sets; molding compounds/die attach materials and 100%

matte tin plate termination finish, which are RoHS compliant and

compatible with both SnPb and Pb-free soldering operations. Intersil

Pb-free products are MSL classified at Pb-free peak reflow

temperatures that meet or exceed the Pb-free requirements of

IPC/JEDEC J STD-020. Pinout ISL59111

(6 Ld CSP)*

TOP VIEW BOTTOM VIEW

*0.7mm MAXIMUM HEIGHT GUARANTEED

OUT

GND

SAG

VDD

OUT

GND

SAG

VDD

Data Sheet April 19, 2007

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774 |Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

2FN6172.4

April 19, 2007

IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are

at the specified temperature and are pulsed tests, therefore: TJ = TC = TA

Absolute Maximum Ratings (TA = +25°C)

Supply Voltage from VS+ to GND . . . . . . . . . . . . . . . . . . . . . . . 3.6V

Input Voltage . . . . . . . . . . . . . . . . . . . . . . . VS+ +0.3V to GND -0.3V

Continuous Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . 40mA

Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves

Storage Temperature. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +125°C

Ambient Operating Temperature . . . . . . . . . . . . . . . .-40°C to +85°C

Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . .+125°C

Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below

http://www.intersil.com/pbfree/Pb-FreeReflow.asp

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the

device at these or any other conditions above those indicated in the operat i onal sections of this specification is not implied.

Electrical Specifications VS+ = 3.3V, TA = +25°C, RL = 150Ω to GND, CL = 0.1µF, unless otherwise specified.

DESCRIPTION PARAMETER CONDITIONS MIN TYP MAX UNIT

INPUT CHARACTERISTICS

VCC Supply Voltage Range 2.5 3.6 V

IDD-ON Quiescent Supply Current VIN = 500mV, EN = VDD, no load 2 2.75 mA

IDD-OFF Shutdown Supply Current EN = 0V 3 µA

VOLS Output Level Shift Voltage VIN = 0V, no load 60 130 200 mV

VCLAMP Input Voltage Clamp IIN = -1mA -40 -15 +10 mV

ICLAMP_CHG Clamp Charge Current VIN = VCLAMP - 100mV -6 -3 mA

ICLAMP_DCHG Clamp Discharge Current VIN = 500mV 2.5 5 7.5 µA

RIN Input Resistance 0.5V < VIN < 1.0V 0.5 3 MΩ

AVVoltage Gain RL = 150Ω1.95 2.0 2.04 V/V

ASAG SAG Correction DC Gain to VOUT SAG open 2.25 V/V

PSRR DC Power Supply Rejection VDD = 2.7V to 3.3V 43 63 dB

VOH Output Voltage High Swing VIN = 2V, RL = 150Ω to GND 2.85 3.2 V

ISC Output Short-Circuit Current VIN = 2V, to GND through 10Ω-94 -65 mA

VIN = 100mV, out short to VDD through 10Ω65 115 mA

IENABLE Enable Current ±3.3V, enable pin = 0V -3 0 +3 µA

VIL Disable Threshold VDD = 2.7V to 3.3V 0.8 V

VIH Enable Threshold VDD = 2.7V to 3.3V 1.6 V

ROUT Shutdown Output Impedance EN = 0V DC 3.6 4.5 5.9 kΩ

EN = 0V, f = 4.5MHz 3.4 kΩ

AC PERFORMANCE

BW ±0.1dB Bandwidth RL = 150Ω, CL = 5pF 4 MHz

BW -3dB Bandwidth RL = 150Ω, CL = 5pF 8 MHz

Normalized Stopband Gain f = 27MHz -24.2 dB

dG Differential Gain NTSC and PAL DC coupled 0.10 %

NTSC and PAL AC coupled 0.84 %

dP Differential Phase NTSC and PAL DC coupled 0.05 °

NTSC and PAL AC coupled 0.62 °

D/DT Group Delay Variation f = 100kHz, 5MHz 5.4 ns

SNR Signal To Noise Ratio 100% white signal 65 dB

ISL59111

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TON Enable Time VIN = 500mV, VOUT to 1% 200 ns

TOFF Disable Time VIN = 500mV, VOUT to 1% 14 ns

+SR Positive Slew Rate 10% to 90%, VIN = 1V step 20 41 70 V/µs

-SR Negative Slew Rate 90% to 10%, VIN = 1V step -15 -30 -70 V/µs

tF Fall Time 2.5VSTEP, 80% - 20% 25 ns

tR Rise Time 2.5VSTEP, 20% - 80% 22 ns

Electrical Specifications VS+ = 3.3V, TA = +25°C, RL = 150Ω to GND, CL = 0.1µF, unless otherwise specified. (Continued)

DESCRIPTION PARAMETER CONDITIONS MIN TYP MAX UNIT

Typical Performance Curves

FIGURE 1. GAIN vs FREQUENCY -0.1dB FIGURE 2. GAIN vs FREQUENCY -3dB POINT

FIGURE 3. GAIN vs FREQUENCY -3dB FIGURE 4. GAIN vs FREQUENCY FOR VARIOUS RLOAD

100K

FREQUENCY (Hz)

NORMALIZED GAIN (dB)

10M1M

0.5

0.3

0.1

-0.1

-0.3

-0.5

-0.1dB BW

@ 4MHz

VDD=+3.3V

RL=150Ω

CL=5pF

ISL59111

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FIGURE 5. GAIN vs FREQUENCY FOR VARIOUS CLOAD FIGURE 6. MAXIMUM OUTPUT MAGNITUDE vs INPUT

MAGNITUDE

FIGURE 7. PHASE vs FREQUENCY FIGURE 8. PSRR vs FREQUENCY

FIGURE 9. OUTPUT IMPEDANCE vs FREQUENCY FIGURE 10. ISOLATION vs FREQUENCY

Typical Performance Curves

OUTPUT IMPEDANCE (Ω)

100

0.01

10K

FREQUENCY (Hz)

100M1M100K 10M

0.1

VDD=+3.3V

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FIGURE 11. MAXIMUM OUTPUT vs LOAD RESISTANCE FIGURE 12. SUPPLY CURRENT vs SUPPLY VOLTAGE

FIGURE 13. LARGE SIGNAL STEP RESPONSE FIGURE 14. SMALL SIGNAL STEP RESPONSE

FIGURE 15. ENABLE TIME FIGURE 16. DISABLE TIME

Typical Performance Curves

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FIGURE 17. HARMONIC DISTORTION vs FREQUENCY FIGURE 18. HARMONIC DISTORTION vs OUTPUT VOLTAGE

FIGURE 19. GROUP DELAY vs FREQUENCY FIGURE 20. -3dB BANDWIDTH vs INPUT RESISTANCE

FIGURE 21. SLEW RATE vs SUPPLY VOLTAGE

Typical Performance Curves

ISL59111

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Application Information

The ISL59111 is a single supp ly rail-to-rail output amplifier

achieving a -3dB bandwidth of around 8MHz and slew rate

of about 40V/µs while demanding only 2mA of supply

current. This part is ideally suited for applications with

specific micropower consumption and high bandwidth

demands. As the performance characteristics above and the

features described below, the ISL 59111 is designed to be

very attractive for portable composite video applications.

The ISL59111 features a sync clamp, low pass function, and

SAG network at the output facilitating reduction of typically

large AC coupling capacitors. See Figure 22.

Internal Sync Clam p

The typical embedded video DAC operates from a ground

referenced single supply. This becomes an issue because

the lower level of the sync pulse output may be at a 0V

reference level to some positive level. The probl em is

presenting a 0V input to most single supply driven amplifiers

will saturate the output stage of the amplifier resulting in a

clipped sync tip and degrading the video image. A larger

positive reference may offset the input above its positive

range.

The ISL59111 features an internal sync clamp and offset

function to level shift the entire video signal to the best level

before it reaches the input of the amplifier stage. These

features are also helpful to avoid saturation of the output

stage of the amplifier by setting the signal closer to the best

voltage range.

The simplified block diagram of the ISL59111 in Figure 22 is

divided into four sections. The first, Section A is the Sync

Clamp. The AC coupled video sync signal is pulled negative

by a current source at the input of the comparator amplifier.

When the sync tip goes below the comparator threshold the

output comparator is driven negative, The PMOS device

turns on clamping sync tip to near ground level. The network

triggers on the sync tip of video signal.

The Sallen Key Low Pass Filter

The Sallen Key is a classic low pass configuration illustrated

in Figure 22. This provides a very stable low pass function,

and in the case of the ISL59111, a three-pole roll-off at

around 8MHz. The three-pole function is accomplished with

an RC low pass network placed in series with and before the

Sallen Key. One pole provided by the RC network and poles

two and three provided by the Sallen Key for a nice three-

pole roll-off at around 8MHz. If more aggressive, multiple-

pole roll-offs are needed, multiple ISL5911 1 can be placed in

series. There will, of course, be a loss of bandwidth as

additional devices are added.

AC Output Coupling and the SAG Network

Composite video signals carry viable information at

frequencies as low as 30Hz up to 5MHz. When a video

system output is AC coupled it is critical that the filter

represented by the output coupling capacitor and the

–

RIN

CIN

VDD

GND

VDD VDD

EN=GND: SHUTDOWN IDD~0

EN=VDD: ACTIVE IDD~1.5mA

R1R2R3

C1C3

VDC

OUT

SAG

ROUT

SYNC CLAMP

SALLEN KEY LOW PASS FILTER

SAG

NETWORK AC COUPLING

CAPACITOR

100nF 47µF

22µF

75Ω

FIGURE 22. BLOCK DIAGRAM

ISL59111

8FN6172.4

April 19, 2007

surrounding resistance network provide a band pass

function with a low pass band low enough to exclude very

low frequencies down to DC, and with a high pass band pass

sufficiently high to include frequencies at the higher end of

the video spectrum.

T ypically this is accomplished with 220µF coupling capacitor ,

a large and somewhat costly solution providing a low

frequency pole around 5Hz. If the size of this capacitor is

even slightly reduced we have found that the accompanying

phase shift in the 50Hz to 100Hz frequency range results in

field tilt resulting in a degraded vide o image.

The internal SAG network of the ISL59111 replaces the

220µF AC coupling capacitor with a network of two smaller

capacitors as shown in Figure 23. Additionally , the network is

designed to place a zero in the ~30Hz range, providing a

small amount of peaking to compensate the phase response

associated wi th field tilt.

DC Output Coupling

The ISL59111 inte rnal sync clamp makes it possible to DC

couple the output to a video load, eliminati ng the need for

any AC coupling capacitors, saving board space and

additional expense for capacitors making the ISL59111 is

designed to be extremely attractive for portable video

applications Additionally, this solution completely eliminates

the issue of field tilt in the lower frequency. The trade off is

greater demand of supply current. Typical load current for

AC coupled is around 3mA compared to typical 6mA used

when DC coupling.

Output Drive Capability

The ISL59111 does not have in ternal short circuit protection

circuitry. If the output is shorted indefinitely, the power

dissipation could easily overheat the die or the current could

eventually compromise metal integrity . Maximum reliability is

maintained if the output current never exceeds ±40mA. This

limit is set by the design of the internal metal interconnect.

Note that in transient applications, the part is robust.

Short circuit protection can be provided externally with a

back match resistor in series with the output placed close as

possible to the output pin. In video applications this would be

a 75Ω resistor and will provide adequate short circuit

protection to the device. Care should still be taken not to

stress the device with a short at the output.

Power Dissipation

With the high output drive capabil ity of the ISL59111, it is

possible to exceed the +125°C absolute maximum junction

temperature under certain load current conditions.

Therefore, it is important to calculate the maximum junction

temperature for an application to determine if load conditions

or package types need to be modified to assure operation of

the amplifier in a safe operating ar ea.

The maximum power dissipation allowed in a package is

determined according to:

Where:

TJMAX = Maximum junction temperature

TAMAX = Maximum ambient temperature

ΘJA = Thermal resistance of the package

The maximum power dissipation actually produced by an IC

is the total quiescent supply current times the total power

supply voltage, plus the power in the IC due to the load, or:

for sourcing:

for sinking:

ROUT

SAG

NETWORK AC COUPLING

CAPACITOR

FIGURE 23. SAG NETWORK AND AC COUPLING

CAPACITORS

TELEVISION

OR VCR

ROUT

ENABLE

FIGURE 24. DC COUPLE

PDMAX TJMAX TAMAX

–

ΘJA

---------------------------------------------

PDMAX VSISMAX VSVOUT

–()+×VOUT

----------------

×=

PDMAX VSISMAX VOUT VS

–()+×ILOAD

×=

ISL59111

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Where:

VS = Supply voltage

ISMAX = Maximum quiescent supply current

VOUT = Maximum output voltage of the application

RLOAD = Load resistance tied to ground

ILOAD = Load current

By setting the two PDMAX equations equal to each other , we

can solve the output current and RLOAD to avoid the device

overheat.

Power Supply Bypassing Printed Circuit Board

Layout

As with any modern operational amplifier, a good printed

circuit board layout is necessary for optimu m performance.

Lead lengths should be as short as possible. The power

supply pin must be well bypassed to reduce the risk of

oscillation. For normal single supply operation, a single

4.7µF tantalum capacitor in parallel with a 0.1µF ceramic

capacitor from VS+ to GND will suffice.

Printed Circuit Board Layout

For good AC performance, parasitic capacitance should be

kept to minimum. Use of wire wound resistors should be

avoided because of their additional series inductance. Use

of sockets should also be avoided if possible. Sockets add

parasitic inductance and capacitance that can result in

compromised performance.

ISL59111

All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.

Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality

Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without

notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and

reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result

from its use. No lice nse is gran t ed by i mpli catio n or other wise u nder an y p a tent or patent rights of Intersi l or it s sub sidi ari es.

For information regarding Intersil Corporation and its products, see www.intersil.com

FN6172.4

April 19, 2007

ISL59111

3x2 Chip Scale Package (CSP)

PIN 1 ID

BOTTOM VIEW

SIDE VIEW

TOP VIEW

PIN A1

INDICATOR

MDP0054

3x2 CHIP SCALE PACKAGE

SYMBOL

MILLIMETERS

MIN NOMINAL MAX

A 0.54 0.65 0.70

A10.27 0.29 0.31

A20.36 REF

bθ 0.34 θ 0.37 θ 0.40

D 0.94 0.99 1.04

D10.50 BASIC

E 1.44 1.49 1.54

E11.00 BASIC

e 0.50 BASIC

SD 0.25 BASIC

SE 0.00 BASIC

Rev. 1 2/07

NOTE:

1. All dimensions are in millimeters.