MAXIM MAX9680 Technical data

19-4904; Rev 1; 12/10

Block Diagram

EVALUATION KIT

AVAILABLE

Internal Gain and Filter in SC70

General Description

The MAX9680 high-speed amplifier and filter is opti­mized for portable video applications. It is specifi­cally designed to be compatible with the video encoders
embedded in application processors with 0.4V
output. The input common-mode range includes GND,
which allows a video DAC (digital-to-analog converter)
to be DC-coupled to the MAX9680.

The output swings within 2mV of GND and 20mV to VDD
with a standard back-terminated video load (150I). An
internal level shift circuit prevents the output from satu­rating with 0V input, thus preventing sync-pulse clipping
in common video circuits. Therefore, the MAX9680 is
ideally suited for DC-coupling to the video load.

The MAX9680 has been optimized for space-sensitive
applications by integrating internal gain setting resistors
(G = 5.2V/V) and a 2-pole video-DAC reconstruction filter.

In shutdown mode, the quiescent current is reduced to
less than 0.4FA, dramatically reducing power consump­tion and prolonging battery life.

The MAX9680 is available in the tiny 2mm x 2.1mm,
6-pin, SC70 package.

P-P

video

3V Video Amplifier with

Features

S 5.2V/V Internal Gain

S 2-Pole Reconstruction Filter

S Input Range Includes Ground

S DC-Coupled Inputs and Outputs

S Rail-to-Rail Output

S 3.7mA Low Quiescent Current

S 0.4µA Shutdown Current

Ordering Information

PART

MAX9680AXT+T

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

Typical Application Circuit appears at end of data sheet.

TEMP

RANGE

-40NC to +125NC

PIN-

PACKAGE

6 SC70 ADT

TOP

MARK

MAX9680

Applications

Mobile Phones

Digital Still Cameras

Digital Video Cameras

Pin Configuration

TOP VIEW

+

GND

RSET

IN

1

2

MAX9680

3

SC70

6

5

4

V

DD

ENABLE

OUT

RSET

ENABLE

V

DD

IN

MAX9680

SHUTDOWN

CONTROL

LPF

OUT

G = 5.2V/V

GND

BUFFER

R

IN

R

SET

_______________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

3V Video Amplifier with
Internal Gain and Filter in SC70

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (VDD to GND) .................................-0.3V to +4V

ENABLE to GND ......................................................-0.3V to +4V

IN to GND ................................................. -0.3V to (VDD + 0.3V)

OUT to GND (ENABLE is high) ................ -0.3V to (VDD + 0.3V)

OUT to GND (ENABLE is low) .............................-0.3V to +3.2V

ENABLE, IN ..................................................................... Q50mA

OUT ...........................................................................Continuous

Electrostatic Discharge

MAX9680

Human Body Model .......................................................2000V

Charged Device Model ...................................................500V

PACKAGE THERMAL CHARACTERISTICS (Note 1)

SC70

Junction-to-Ambient Thermal Resistance (qJA) .....326.5°C/W

Junction-to-Case Thermal Resistance (qJC) .............115°C/W

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer

board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(V

= V

DD

= +25NC.) (Note 2)

OFFSET LEVEL-SHIFT VOLTAGE

Output Level-Shift Voltage V
Power-Supply Rejection Ratio PSRR VIN = V

INPUT VOLTAGE RANGE

Input Voltage Range V

Input Resistance (In+) R
R

Resistance R

SET

R

SET/RIN

VOLTAGE GAIN

DC Voltage Gain (Note 3) A

FREQUENCY RESPONSE

Filter Response

Differential Gain Error

Differential Phase Error

= 2.8V, V

ENABLE

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Ratio 4.214 4.3 4.386

= 0V, RL = 150I to GND. TA = -40NC to +125NC, unless otherwise noted. Typical values are at TA

GND

OLS

CM

SET

VIN = V

GND

GND

VDD = 2.7V V
VDD = 2.8V V
VIN = 0.5V 732 872 1012

IN

V

= 0.5V 3150 3750 4350

RSET

VDD = 2.7V, VIN = V

V

VDD = 2.8V, VIN = V

VIN = V

0.387V

Five-step modulated staircase of 127.8mV
step size and 305.3mV peak-to-peak
subcarrier amplitude, f = 4.43MHz

Five-step modulated staircase of 127.8mV
step size and 305.3mV peak-to-peak
subcarrier amplitude, f = 4.43MHz

GND

to

Continuous Power Dissipation (TA = +70NC)

6-Pin SC70 (derate 3.1mW/C above +70NC) .............245mW

Operating Temperature Range ........................ -40NC to +125NC

Junction Temperature .....................................................+150NC

Storage Temperature Range ............................ -65NC to +150NC

Lead Temperature (soldering, 10s) ................................+300NC

Soldering Temperature (reflow) ......................................+260NC

0 120 250 mV

, VDD = 2.7V to 3.6V 200

GND

GND

to 0.445V 5.00 5.17 5.34

GND

to 0.464V 5.00 5.17 5.34

GND

f = 4.5MHz -0.2

f = 9MHz -3.5

f = 27MHz -23

f = 54MHz -45

0.2 %

0.3 degrees

0.445

0.464

FV/V

V

I

I

V/V

dB

2 ______________________________________________________________________________________

3V Video Amplifier with

Internal Gain and Filter in SC70

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

DD

= +25NC.) (Note 2)

Group Delay Variation
Signal-to-Noise Ratio SNR 100% white signal 65 dB

OUTPUT

Positive Voltage Output Swing
from Rail

Negative Voltage Output Swing
from Rail

Positive Voltage Output Swing
from Rail

Negative Voltage Output Swing
from Rail

Output Leakage Disabled, V
Output Short-Circuit Current I

POWER SUPPLY

Supply Voltage V
Supply Current I

ENABLE/SHUTDOWN FUNCTION

Disabled (Logic-Low Threshold) 0 0.45 V
Enabled (Logic-High Threshold) 1.3 V
Enable Time 350 ns
Disable Time 200 ns
Shutdown Current Disabled 0.4 4

Note 2: All devices are 100% production tested at TA = +25NC. Specifications over temperature limits are guaranteed by design.
Note 3: Voltage gain (AV) is a two-point measurement in which the output voltage swing is divided by the input voltage swing.

ENABLE

= 2.8V, V

= 0V, RL = 150I to GND. TA = -40NC to +125NC, unless otherwise noted. Typical values are at TA

GND

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

100kHz P f P 5.5MHz, VIN = V

GND

to 0.387V

15 ns

VIN = 0.7V 20 250 mV

VIN = -0.05V 1.8 5 mV

35 mV

1 mV

FA

DD

OUT

DD

DD

VIN = 0.7V, RL = 75I to GND

VIN = -0.05V, RL = 75I to GND

= 2V 2

OUT

Short to GND 90 mA

2.7 3.6 V

No load 3.7 9 mA

FA

V

MAX9680

Typical Operating Characteristics

(V

= V

DD

INPUT RESISTANCE vs. TEMPERATURE

890

885

880

875

870

INPUT RESISTANCE (I)

865

860

-60 140

ENABLE

= 2.8V, V

V

IN

TEMPERATURE (°C)

= 0V, RL = 150I to GND. TA = +25NC, unless otherwise noted.)

GND

= 0.4V

MAX9680 toc01

120100806040200-20-40

SET RESISTANCE vs. TEMPERATURE

3900

3850

3800

3750

3700

SET RESISTANCE (I)

3650

3600

-60 140
TEMPERATURE (°C)

R

vs. TEMPERATURE

4.5

MAX9680 toc02

4.4

4.3

(I/I)

IN

/R

SET

4.2

R

4.1

120100806040200-20-40

4.0

SET/RIN

TEMPERATURE (°C)

_______________________________________________________________________________________ 3

120100806040200-20-40-60 140

MAX9680 toc03

3V Video Amplifier with
Internal Gain and Filter in SC70

Typical Operating Characteristics (continued)

(V

DD

= V

ENABLE

= 2.8V, V

= 0V, RL = 150I to GND. TA = +25NC, unless otherwise noted.)

GND

5.5

5.4

MAX9680

5.3

GAIN (V/V)

5.2

5.1

5.0

TEMPERATURE (°C)

OUTPUT VOLTAGE LEVEL SHIFT

vs. TEMPERATURE

V

0.200

0.175

0.150

0.125

0.100

0.075

0.050

OUTPUT VOLTAGE LEVEL SHIFT (V)

0.025

0

TEMPERATURE (

GAIN vs. TEMPERATURE

120100806040200-20-40-60 140

5

MAX9680 toc04

4

3

2

OUTPUT VOLTAGE (mV)

1

0

OUTPUT VOLTAGE vs. TEMPERATURE

= -50mV

V

IN

120100806040200-20-40-60 140

TEMPERATURE (°C)

MAX9680 toc05

OUTPUT VOLTAGE vs. TEMPERATURE

= 700mV

V

2.90

2.85

2.80

2.75

2.70

OUTPUT VOLTAGE (V)

2.65

2.60

-60 140

IN

TEMPERATURE (°C)

MAX9680 toc06

120100806040200-20-40

OUTPUT LEAKAGE CURRENT

= V

IN

GND

120100806040200-20-40-60 140

°C)

9

8

MAX9680 toc07

7

6

5

QUIESCENT CURRENT (mA)

4

3

-60 140

= 2.8V

V

ENABLE

TEMPERATURE (°C)

100

MAX9680 toc08

10

1

0.1

OUTPUT LEAKAGE CURRENT (nA)

100806040200-20-40

120

0.01

QUIESCENT CURRENT vs. TEMPERATURE

vs. TEMPERATURE

ENABLE = GND, V

TEMPERATURE (°C)

OUT

= 2V

MAX9680 toc09

120100806040200-20-40-60 140

OUTPUT LEAKAGE CURRENT

vs. TEMPERATURE, ENABLE = 0

100

90

80

70

60

50

40

30

20

OUTPUT LEAKAGE CURRENT (nA)

10

0

SHORT TO V

TEMPERATURE (°C)

MAX9680 toc10

CC

SHORT TO GND

120100806040200-20-40-60 140

SHUTDOWN QUIESCENT CURRENT

HYSTERESIS vs. TEMPERATURE

10

1

0.1

QUIESCENT CURRENT (mA)

TA = +125°C

0.01

0.6 1.0

ENABLE VOLTAGE (V)

TA = +25°C

TA = -40°C

0.90.80.7

MAX9680 toc11

0

GAIN vs. FREQUENCY

-5

-10

-15

-20

GAIN (dB)

-25

-30

-35

-40
100 100,000

FREQUENCY (kHz)

4 ______________________________________________________________________________________

MAX9680 toc12

10,0001000

3V Video Amplifier with

Internal Gain and Filter in SC70

Typical Operating Characteristics (continued)

(V

DD

= V

ENABLE

= 2.8V, V

= 0V, RL = 150I to GND. TA = +25NC, unless otherwise noted.)

GND

MAX9680

V

CC

(2V/div)

OUTPUT

(1V/div)

OUTPUT VOLTAGE vs. OUTPUT CURRENT

3.0

2.5

2.0

1.5

TA = 0°C AND +25°C

1.0

OUTPUT VOLTAGE (V)

0.5

0

0 120

TA = +125°C

TA = +85°C

TA = -25°C

TA = -40°C

OUTPUT CURRENT (mA)

TURN-ON TIME

TIME (200ns/div)

MAX9680 toc15

10080604020

MAX9680 toc13

GND

GND

OUTPUT VOLTAGE

vs. OUTPUT SINKING CURRENT

3.0

2.5

2.0

1.5

1.0

OUTPUT VOLTAGE (V)

0.5

0

TA = 0°C

TA = -25°C

TA = -40°C

0 3.0

OUTPUT CURRENT (mA)

V

(2V/div)

OUTPUT

(1V/div)

TA = +125°C

TA = +85°C

TA = +25°C

TURN-OFF TIME

CC

TIME (40ns/div)

MAX9680 toc14

GND

GND

GROUP DELAY vs. FREQUENCY

100

90

MAX9680 toc16

80

70

60

50

DELAY (ns)

40

30

20

10

2.52.01.51.00.5

0

100 100,000

FREQUENCY (kHz)

10,0001000

MAX9680 toc17

POWER-SUPPLY REJECTION RATIO

MAX9680

0

-10

-20

-30

-40

-50

-60

RESPONSE (dB)

-70

-80

-90

-100

0.1 100

VDD = 2.8V ± 100mV
V

ENABLE

RL = 150Ω TO GND
VIN = GND

FREQUENCY (MHz)

= 2.8V

101

_______________________________________________________________________________________ 5

P-P

0.03

0.02

MAX9680 toc17a

0.01

0

-0.01

DIFFERENTIAL GAIN (%)

-0.02

-0.03

DIFFERENTIAL GAIN AND PHASE

f = 4.43MHz

0 1 2 3 4 5

0.6

0.4

MAX9680 toc18

0.2

0

-0.2

DIFFERENTIAL PHASE (deg)

-0.4

-0.6

0 1 2 3 4 5

DIFFERENTIAL GAIN AND PHASE

f = 4.43MHz

MAX9680 toc19

3V Video Amplifier with
Internal Gain and Filter in SC70

Pin Description

PIN NAME DESCRIPTION

1 IN Input
2 GND Ground

3 RSET

MAX9680

4 OUT Output
5 ENABLE Enable. Drive high to enable the device. Pull low to disable the device.
6 V

DD

Resistor Set. The reference voltage of the current digital-to-analog converter (DAC) is applied
across the internal R

Positive Power Supply. Bypass to GND with a 0.1FF capacitor.

resistor to generate the reference current of the DAC.

SET

Detailed Description

The MAX9680 filters and amplifies the video DAC output
in applications such as mobile phones. The MAX9680
consists of two resistors, an input buffer, lowpass filter,
and output amplifier capable of driving a standard 150I
video load to ground. The output amplifier provides a
fixed gain of 5.17V/V.

R

Resistor

SET

The video current DAC imposes a reference voltage,
V

, across R

REF

the reference current for the video current DAC.

The video input should be directly connected to the out­put of the video current DAC. RIN, the equivalent input
resistance, is 872I to ground. The output current of the
video DAC flows through RIN to create the video signal
in the voltage domain.

The filter bandwidth (-3dB) is typically 9MHz, making the
device suitable for standard-definition video signals from
all sources (e.g., broadcast and DVD). Broadcast video
signals are channel limited: NTSC signals have 4.2MHz
bandwidth, and PAL signals have 5MHz bandwidth.
Video signals from a DVD player, however, are not chan­nel limited; so the bandwidth of DVD video signals can
approach the Nyquist limit of 6.75MHz. Recommendation:
ITU-R BT.601-5 specifies 13.5MHz as the sampling rate

. The resulting current (V

SET

REF/RSET

) is

Input

Video Filter

for standard-definition video. Therefore, the maximum
bandwidth of the signal is 6.75MHz. To ease the filtering
requirements, most modern video systems oversample
by two times, clocking the video current DAC at 27MHz.

Output

The MAX9680 features 5.17V/V gain. Operating from a

2.7V to 3.6V supply, the output amplifier is able to drive
a 2.3V signal into a 150I video load to ground. The out­put is typically offset 120mV above ground to guarantee
linear operation of the amplifier. The MAX9680 output
only sources current; all loads should be connected to
ground.

Short-Circuit Protection

The MAX9680 Typical Application Circuit includes a 75I
back-termination resistor that limits short-circuit currents
for an external short applied at the video output. The
MAX9680 features internal output short-circuit protection
to prevent device damage in prototyping and applica­tions where the amplifier output can be directly shorted.

Short-circuit protection activates if the output is short
circuited and the output current exceeds 90mA. During
short-circuit protection, the output of the MAX9680 is
shut off for 18Fs and then turns on for 0.6Fs. If the short
is still present, the MAX9680 output shuts off again.
Extended short circuits result in a pulsed output. The
device resumes normal operation after the short is
removed.

6 ______________________________________________________________________________________

3V Video Amplifier with

Internal Gain and Filter in SC70

Application Information

Input Considerations

The MAX9680 input is DC-coupled. When the supply volt­age is between 2.7V and 3.6V, the input voltage range
extends from ground to 0.445V. When the supply volt­age is between 2.8V and 3.6V, the input voltage range
extends from ground to 0.464V. A typical current-output
DAC that operates from a single supply usually creates
a composite video signal with a sync tip very close to
ground. Hence, the DAC output can be directly con­nected to the MAX9680 input. Keep the board trace as
short as possible to minimize parasitic stray capacitance
and prevent unintentional high-frequency attenuation.

The MAX9680 output must be DC-coupled. No
AC-coupled capacitors are allowed. The MAX9680 con­nects directly to the video cable through a 75I series
back-termination resistor. The other end of the cable
should be properly terminated with a 75I resistor as
well. Because of this configuration, the peak-to-peak
amplitude as well as the DC level of the signal is divided
by two. The MAX9680 output signal is level-shifted up so
the sync tip is approximately 120mV.

Power-Supply Bypassing and Ground

The MAX9680 operates from a single-supply voltage
down to 2.7V, allowing for low-power operation. Bypass
VDD to GND with a 0.1FF capacitor. Place all external
components as close as possible to the device.

Typical Application Circuit

Output Considerations

MAX9680

VIDEO ENCODER

DAC

GENERAL-PURPOSE OUTPUT

RSET

ENABLE

V

= 2.8V

DD

IN

MAX9680

SHUTDOWN

CONTROL

LPF

OUT

75I

G = 5.2V/V

GND

BUFFER

R

IN

R

SET

Chip Information

PROCESS: BiCMOS

_______________________________________________________________________________________ 7

3V Video Amplifier with
Internal Gain and Filter in SC70

Package Information

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.

PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.

6 SC70 X6SN+1

21-0077 90-0189

MAX9680

8 ______________________________________________________________________________________

3V Video Amplifier with

Internal Gain and Filter in SC70

Revision History

MAX9680

REVISION

NUMBER

0 9/09 Initial release —
1 12/10 Added PSRR TOC 5

REVISION

DATE

DESCRIPTION

PAGES

CHANGED

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 9

©

2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.