MAXIM MAX9680

19-4904; Rev 0; 9/09
TION KIT
EVALUA BLE
AVAILA
3V Video Amplifier with
Internal Gain and Filter in SC70
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 0.4VP-P video
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.
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
TEMP
RANGE
PART
MAX9680AXT+T -40NC to +125NC
PINPACKAGE
TOP
MARK
6 SC70
ADT
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Typical Application Circuit appears at end of data sheet.
Block Diagram
Applications
Mobile Phones
Digital Still Cameras
VDD
Digital Video Cameras
Pin Configuration
IN
RIN
BUFFER
RSET
GND 2
OUT
MAX9680
TOP VIEW
IN 1
LPF
RSET
+
G = 5.2V/V
6 VDD
MAX9680
RSET 3
5 ENABLE
ENABLE
SHUTDOWN
CONTROL
4 OUT
SC70
GND
________________________________________________________________ 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.
MAX9680
General Description
MAX9680
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
Human Body Model........................................................2000V
Charged Device Model....................................................500V
Thermal Limits (Note 1)
Multiple-Layer PCB
Continuous Power Dissipation (TA = +70NC)
6-Pin SC70 (derate 3.1mW/C above +70NC)..............245mW
6-Pin SC70 BJA. .....................................................326.5NC/W
6-Pin SC70 BJC.........................................................115NC/W
Operating Temperature Range......................... -40NC to +125NC
Junction Temperature......................................................+150NC
Storage Temperature Range............................. -65NC to +150NC
Lead Temperature (soldering, 10s).................................+300NC
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
(VDD = VENABLE = 2.8V, VGND = 0V, RL = 150I to GND. TA = -40NC to +125NC, unless otherwise noted. Typical values are at TA
= +25NC.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
120
250
UNITS
OFFSET LEVEL-SHIFT VOLTAGE
Output Level-Shift Voltage
VOLS
VIN = VGND
Power-Supply Rejection Ratio
PSRR
VIN = VGND, VDD = 2.7V to 3.6V
0
200
mV
FV/V
INPUT VOLTAGE RANGE
Input Voltage Range
Input Resistance (In+)
RSET Resistance
VCM
RIN
RSET
VDD = 2.7V
VGND
0.445
VDD = 2.8V
VGND
0.464
V
VIN = 0.5V
732
872
1012
I
VRSET = 0.5V
3150
3750
4350
I
4.214
4.3
4.386
RSET/RIN Ratio
VOLTAGE GAIN
DC Voltage Gain (Note 3)
AV
VDD = 2.7V, VIN = VGND to 0.445V
5.00
5.17
5.34
VDD = 2.8V, VIN = VGND to 0.464V
5.00
5.17
5.34
V/V
FREQUENCY RESPONSE
VIN = VGND to
0.387V
Filter Response
f = 4.5MHz
-0.2
f = 9MHz
-3.5
f = 27MHz
-23
f = 54MHz
-45
dB
Differential Gain Error
Five-step modulated staircase of 127.8mV
step size and 305.3mV peak-to-peak
subcarrier amplitude, f = 4.43MHz
0.2
%
Differential Phase Error
Five-step modulated staircase of 127.8mV
step size and 305.3mV peak-to-peak
subcarrier amplitude, f = 4.43MHz
0.3
degrees
Group Delay Variation
100kHz P f P 5.5MHz, VIN = VGND to 0.387V
15
ns
100% white signal
65
dB
Signal-to-Noise Ratio
SNR
2 _______________________________________________________________________________________
3V Video Amplifier with
Internal Gain and Filter in SC70
(VDD = VENABLE = 2.8V, VGND = 0V, RL = 150I to GND. TA = -40NC to +125NC, unless otherwise noted. Typical values are at TA
= +25NC.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OUTPUT
Positive Voltage Output Swing
from Rail
VIN = 0.7V
20
250
mV
Negative Voltage Output Swing
from Rail
VIN = -0.05V
1.8
5
mV
Positive Voltage Output Swing
from Rail
VIN = 0.7V, RL = 75I to GND
35
mV
Negative Voltage Output Swing
from Rail
VIN = -0.05V, RL = 75I to GND
1
mV
Output Leakage
Disabled, VOUT = 2V
Output Short-Circuit Current
IOUT
2
Short to GND
90
FA
mA
POWER SUPPLY
Supply Voltage
VDD
Supply Current
IDD
2.7
No load
3.7
3.6
V
9
mA
V
ENABLE/SHUTDOWN FUNCTION
Disabled (Logic-Low Threshold)
0
0.45
Enabled (Logic-High Threshold)
1.3
VDD
Enable Time
350
Disable Time
200
Shutdown Current
Disabled
0.4
V
ns
ns
4
FA
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.
Typical Operating Characteristics
(VDD = VENABLE = 2.8V, VGND = 0V, RL = 150I to GND. TA = +25NC, unless otherwise noted.)
875
870
865
3800
3750
3700
-60 -40 -20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
4.3
4.2
4.1
3650
860
4.4
RSET/RIN (I/I)
880
4.5
MAX9680 toc02
3850
SET RESISTANCE (I)
INPUT RESISTANCE (I)
885
RSET/RIN vs. TEMPERATURE
SET RESISTANCE vs. TEMPERATURE
3900
MAX9680 toc01
890
MAX9680 toc03
INPUT RESISTANCE vs. TEMPERATURE
VIN = 0.4V
4.0
3600
-60 -40 -20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
-60 -40 -20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
_______________________________________________________________________________________ 3
MAX9680
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics (continued)
(VDD = VENABLE = 2.8V, VGND = 0V, RL = 150I to GND. TA = +25NC, unless otherwise noted.)
OUTPUT VOLTAGE vs. TEMPERATURE
VIN = -50mV
5.2
5.1
20 40 60 80 100 120 140
2.80
2.75
2.70
2.65
2.60
-60 -40 -20 0
-60 -40 -20 0
20 40 60 80 100 120 140
20 40 60 80 100 120 140
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT VOLTAGE LEVEL SHIFT
vs. TEMPERATURE
VIN = VGND
QUIESCENT CURRENT vs. TEMPERATURE
VENABLE = 2.8V
OUTPUT LEAKAGE CURRENT
vs. TEMPERATURE
ENABLE = GND, VOUT = 2V
0.125
0.100
0.075
0.050
7
6
5
4
0.025
3
0
-60 -40 -20 0
TEMPERATURE (°C)
OUTPUT LEAKAGE CURRENT
vs. TEMPERATURE, ENABLE = 0
SHUTDOWN QUIESCENT CURRENT
HYSTERESIS vs. TEMPERATURE
70
60
SHORT TO VCC
30
20 40 60 80 100 120 140
TEMPERATURE (°C)
MAX9680 toc09
-20
MAX9680 toc11
-30
TA = +25°C
TA = +125°C
-35
-40
0.01
-60 -40 -20 0
-15
-25
SHORT TO GND
0
-5
-10
0.1
20
10
GAIN vs. FREQUENCY
TA = -40°C
1
20 40 60 80 100 120 140
0
GAIN (dB)
QUIESCENT CURRENT (mA)
80
-60 -40 -20 0
TEMPERATURE (°C)
10
MAX9680 toc10
90
0.1
20 40 60 80 100 120 140
TEMPERATURE (°C)
100
1
0.01
-60 -40 -20 0
20 40 60 80 100 120 140
10
MAX9680 toc12
0.150
100
OUTPUT LEAKAGE CURRENT (nA)
8
QUIESCENT CURRENT (mA)
0.175
MAX9680 toc08
9
MAX9680 toc07
0.200
OUTPUT VOLTAGE LEVEL SHIFT (V)
2
0
-60 -40 -20 0
40
3
1
5.0
50
2.85
OUTPUT VOLTAGE (V)
5.3
2.90
MAX9680 toc05
4
OUTPUT VOLTAGE (mV)
5.4
GAIN (V/V)
5
MAX9680 toc04
5.5
OUTPUT VOLTAGE vs. TEMPERATURE
VIN = 700mV
MAX9680 toc06
GAIN vs. TEMPERATURE
OUTPUT LEAKAGE CURRENT (nA)
MAX9680
3V Video Amplifier with
Internal Gain and Filter in SC70
0.6
0.7
0.8
ENABLE VOLTAGE (V)
0.9
1.0
100
1000
10,000
FREQUENCY (kHz)
4 _______________________________________________________________________________________
100,000
3V Video Amplifier with
Internal Gain and Filter in SC70
TURN-OFF TIME
VCC
(2V/div)
MAX9680 toc14
MAX9680 toc13
TURN-ON TIME
VCC
(2V/div)
GND
GND
OUTPUT
(1V/div)
OUTPUT
(1V/div)
GND
GND
TIME (40ns/div)
TIME (200ns/div)
OUTPUT VOLTAGE
vs. OUTPUT SINKING CURRENT
TA = +85°C
1.5
TA = 0°C AND +25°C
1.0
TA = -25°C
MAX9680 toc16
100
90
80
TA = 0°C
2.0
70
TA = -25°C
DELAY (ns)
2.0
2.5
OUTPUT VOLTAGE (V)
TA = +125°C
TA = +125°C
1.5
TA = +85°C
TA = -40°C
1.0
0
0
40
40
10
0
20
50
20
TA = -40°C
60
80
100
120
0
0.5
OUTPUT CURRENT (mA)
1.0
1.5
2.0
1000
100
3.0
2.5
DIFFERENTIAL GAIN AND PHASE
f = 4.43MHz
DIFFERENTIAL GAIN AND PHASE
f = 4.43MHz
0.6
0.4
DIFFERENTIAL PHASE (deg)
0.02
0.01
0
-0.01
-0.02
100,000
MAX9680 toc19
0.03
10,000
FREQUENCY (kHz)
OUTPUT CURRENT (mA)
MAX9680 toc18
0
60
30
TA = +25°C
0.5
0.5
DIFFERENTIAL GAIN (%)
OUTPUT VOLTAGE (V)
2.5
GROUP DELAY vs. FREQUENCY
3.0
MAX9680 toc15
3.0
MAX9680 toc17
OUTPUT VOLTAGE vs. OUTPUT CURRENT
0.2
0
-0.2
-0.4
-0.03
-0.6
0
1
2
3
4
5
0
1
2
3
4
5
_______________________________________________________________________________________ 5
MAX9680
Typical Operating Characteristics (continued)
(VDD = VENABLE = 2.8V, VGND = 0V, RL = 150I to GND. TA = +25NC, unless otherwise noted.)
MAX9680
3V Video Amplifier with
Internal Gain and Filter in SC70
Pin Description
PIN
NAME
DESCRIPTION
1
IN
2
GND
Input
Ground
3
RSET
Resistor Set. The reference voltage of the current digital-to-analog converter (DAC) is applied
across the internal RSET resistor to generate the reference current of the DAC.
4
OUT
Output
5
ENABLE
6
VDD
Enable. Drive high to enable the device. Pull low to disable the device.
Positive Power Supply. Bypass to GND with a 0.1FF capacitor.
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.
RSET Resistor
The video current DAC imposes a reference voltage,
VREF, across RSET. The resulting current (VREF/RSET) is
the reference current for the video current DAC.
Input
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.
Video Filter
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
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
Output Considerations
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.
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.
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
VDD = 2.8V
VIDEO ENCODER
DAC
IN
RIN
BUFFER
LPF
OUT
75I
RSET
MAX9680
RSET
G = 5.2V/V
GENERAL-PURPOSE OUTPUT
ENABLE
SHUTDOWN
CONTROL
GND
Chip Information
PROCESS: BiCMOS
_______________________________________________________________________________________ 7
MAX9680
Application Information
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
DOCUMENT NO.
6 SC70
X6SN+1
21-0077
SC70, 6L.EPS
MAX9680
3V Video Amplifier with
Internal Gain and Filter in SC70
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.
8
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Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.