MAX9680AXT+T [MAXIM]
3V Video Amplifier with Internal Gain and Filter in SC70; 3V视频放大器，内部增益和滤波器在SC70
| 型号： | MAX9680AXT+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 3V Video Amplifier with Internal Gain and Filter in SC70 |
| 文件： | 总8页 (文件大小：1054K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering Information
TEMP
RANGE
PIN-
TOP
PART
PACKAGE
MARK
MAX9680AXT+T -40NC to +125NC
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
V
DD
IN
LPF
BUFFER
OUT
R
IN
RSET
MAX9680
TOP VIEW
R
SET
+
G = 5.2V/V
IN
GND
RSET
6
5
4
1
2
3
V
DD
ENABLE
SHUTDOWN
CONTROL
ENABLE
OUT
MAX9680
SC70
GND
3V Video Amplifier with
Internal Gain and Filter in SC70
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
to GND).................................-0.3V to +4V
Thermal Limits (Note 1)
Multiple-Layer PCB
DD
ENABLE to GND......................................................-0.3V to +4V
IN to GND................................................. -0.3V to (V
OUT to GND (ENABLE is high)................ -0.3V to (V
OUT to GND (ENABLE is low) .............................-0.3V to +3.2V
ENABLE, IN..................................................................... Q50mA
OUT ...........................................................................Continuous
Electrostatic Discharge
+ 0.3V)
+ 0.3V)
Continuous Power Dissipation (T = +70NC)
DD
A
6-Pin SC70 (derate 3.1mW/C above +70NC) .............245mW
DD
6-Pin SC70 B ......................................................326.5NC/W
JA
6-Pin SC70 B .........................................................115NC/W
JC
Operating Temperature Range........................ -40NC to +125NC
Junction Temperature .....................................................+150NC
Storage Temperature Range............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Human Body Model.......................................................2000V
Charged Device Model ...................................................500V
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
DD
= V
= 2.8V, V
= 0V, R = 150I to GND. T = -40NC to +125NC, unless otherwise noted. Typical values are at T
ENABLE
GND
L
A
A
= +25NC.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OFFSET LEVEL-SHIFT VOLTAGE
Output Level-Shift Voltage
V
V
V
= V
= V
0
120
200
250
mV
OLS
IN
GND
Power-Supply Rejection Ratio
INPUT VOLTAGE RANGE
PSRR
, V
GND DD
= 2.7V to 3.6V
FV/V
IN
V
V
V
V
= 2.7V
V
0.445
0.464
1012
4350
4.386
DD
GND
GND
Input Voltage Range
Input Resistance (In+)
V
V
CM
= 2.8V
= 0.5V
V
DD
R
732
3150
4.214
872
3750
4.3
I
I
IN
IN
RSET
R
R
Resistance
R
SET
= 0.5V
SET
/R Ratio
SET IN
VOLTAGE GAIN
V
= 2.7V, V = V
to 0.445V
to 0.464V
5.00
5.00
5.17
5.17
5.34
5.34
DD
IN
GND
DC Voltage Gain (Note 3)
FREQUENCY RESPONSE
A
V
V/V
V
DD
= 2.8V, V = V
IN
GND
f = 4.5MHz
f = 9MHz
-0.2
-3.5
-23
-45
V
= V
to
IN
GND
Filter Response
dB
%
0.387V
f = 27MHz
f = 54MHz
Five-step modulated staircase of 127.8mV
step size and 305.3mV peak-to-peak
subcarrier amplitude, f = 4.43MHz
Differential Gain Error
Differential Phase Error
0.2
0.3
Five-step modulated staircase of 127.8mV
step size and 305.3mV peak-to-peak
subcarrier amplitude, f = 4.43MHz
degrees
Group Delay Variation
Signal-to-Noise Ratio
100kHz Pf P5.5MHz, V = V
to 0.387V
15
65
ns
IN
GND
SNR
100% white signal
dB
2
______________________________________________________________________________________
3V Video Amplifier with
Internal Gain and Filter in SC70
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= V
= 2.8V, V
= 0V, R = 150I to GND. T = -40NC to +125NC, unless otherwise noted. Typical values are at T
ENABLE
GND
L
A
A
= +25NC.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OUTPUT
Positive Voltage Output Swing
from Rail
V
IN
V
IN
V
IN
V
IN
= 0.7V
20
1.8
35
1
250
5
mV
mV
mV
mV
Negative Voltage Output Swing
from Rail
= -0.05V
= 0.7V, R = 75Ito GND
Positive Voltage Output Swing
from Rail
L
Negative Voltage Output Swing
from Rail
= -0.05V, R = 75Ito GND
L
Output Leakage
Disabled, V
= 2V
2
FA
OUT
Output Short-Circuit Current
POWER SUPPLY
I
Short to GND
No load
90
mA
OUT
Supply Voltage
V
2.7
3.6
9
V
DD
Supply Current
I
3.7
mA
DD
ENABLE/SHUTDOWN FUNCTION
Disabled (Logic-Low Threshold)
Enabled (Logic-High Threshold)
Enable Time
0
0.45
V
V
1.3
V
DD
350
200
0.4
ns
ns
FA
Disable Time
Shutdown Current
Disabled
4
Note 2: All devices are 100% production tested at T = +25NC. Specifications over temperature limits are guaranteed by design.
A
Note 3: Voltage gain (A ) is a two-point measurement in which the output voltage swing is divided by the input voltage swing.
V
Typical Operating Characteristics
(V
DD
= V
= 2.8V, V
= 0V, R = 150Ito GND. T = +25NC, unless otherwise noted.)
ENABLE
GND L A
INPUT RESISTANCE vs. TEMPERATURE
= 0.4V
V
SET RESISTANCE vs. TEMPERATURE
R /R vs. TEMPERATURE
SET IN
IN
890
3900
3850
3800
3750
3700
3650
3600
4.5
4.4
4.3
4.2
4.1
4.0
885
880
875
870
865
860
-60 -40 -20
0
20 40 60 80 100 120 140
-60 -40 -20
0
20 40 60 80 100 120 140
-60 -40 -20
0
20 40 60 80 100 120 140
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
3
3V Video Amplifier with
Internal Gain and Filter in SC70
Typical Operating Characteristics (continued)
(V
DD
= V
= 2.8V, V
= 0V, R = 150Ito GND. T = +25NC, unless otherwise noted.)
ENABLE
GND
L
A
OUTPUT VOLTAGE vs. TEMPERATURE
OUTPUT VOLTAGE vs. TEMPERATURE
= 700mV
GAIN vs. TEMPERATURE
V = -50mV
IN
V
IN
5.5
5
4
3
2
1
0
2.90
2.85
2.80
2.75
2.70
2.65
2.60
5.4
5.3
5.2
5.1
5.0
-60 -40 -20
0
20 40 60 80 100 120 140
-60 -40 -20
0
20 40 60 80 100 120 140
-60 -40 -20
0
20 40 60 80 100 120 140
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT LEAKAGE CURRENT
vs. TEMPERATURE
OUTPUT VOLTAGE LEVEL SHIFT
vs. TEMPERATURE
QUIESCENT CURRENT vs. TEMPERATURE
= 2.8V
ENABLE = GND, V
= 2V
V
= V
V
OUT
IN
GND
ENABLE
0.200
0.175
0.150
0.125
0.100
0.075
0.050
0.025
0
9
8
7
6
5
4
3
100
10
1
0.1
0.01
-60 -40 -20
0
20 40 60 80 100 120 140
-60 -40 -20
0
20 40 60 80 100 120 140
-60 -40 -20
0
20 40 60 80 100 120 140
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
SHUTDOWN QUIESCENT CURRENT
HYSTERESIS vs. TEMPERATURE
OUTPUT LEAKAGE CURRENT
vs. TEMPERATURE, ENABLE = 0
GAIN vs. FREQUENCY
100
90
80
70
60
50
40
30
20
10
0
10
1
0
-5
-10
-15
-20
-25
-30
-35
-40
T
= -40°C
A
SHORT TO V
CC
0.1
0.01
T
A
= +25°C
0.9
T
A
= +125°C
0.7
SHORT TO GND
-60 -40 -20
0
20 40 60 80 100 120 140
0.6
0.8
1.0
100
1000
10,000
100,000
TEMPERATURE (°C)
ENABLE VOLTAGE (V)
FREQUENCY (kHz)
4
______________________________________________________________________________________
3V Video Amplifier with
Internal Gain and Filter in SC70
Typical Operating Characteristics (continued)
(V
DD
= V
= 2.8V, V
= 0V, R = 150Ito GND. T = +25NC, unless otherwise noted.)
ENABLE
GND
L
A
TURN-OFF TIME
TURN-ON TIME
V
CC
(2V/div)
V
CC
GND
GND
GND
(2V/div)
OUTPUT
(1V/div)
OUTPUT
(1V/div)
GND
TIME (40ns/div)
TIME (200ns/div)
OUTPUT VOLTAGE
vs. OUTPUT SINKING CURRENT
OUTPUT VOLTAGE vs. OUTPUT CURRENT
GROUP DELAY vs. FREQUENCY
3.0
3.0
2.5
2.0
1.5
1.0
0.5
0
100
90
80
70
60
50
40
30
20
10
0
2.5
2.0
1.5
1.0
0.5
0
T
= +125°C
A
T
= 0°C
A
T
= +85°C
A
T
= -25°C
A
T
= +125°C
A
T
= 0°C AND +25°C
A
T = +85°C
A
T
= -40°C
A
T
= +25°C
T
= -25°C
A
A
T
A
= -40°C
40
0
20
60
80
100
120
0
0.5
1.0
1.5
2.0
2.5
3.0
100
1000
10,000
100,000
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
FREQUENCY (kHz)
DIFFERENTIAL GAIN AND PHASE
f = 4.43MHz
DIFFERENTIAL GAIN AND PHASE
f = 4.43MHz
0.03
0.02
0.01
0
0.6
0.4
0.2
0
-0.01
-0.02
-0.03
-0.2
-0.4
-0.6
0
1
2
3
4
5
0
1
2
3
4
5
_______________________________________________________________________________________
5
3V Video Amplifier with
Internal Gain and Filter in SC70
Pin Description
PIN
1
NAME
IN
DESCRIPTION
Input
2
GND
Ground
Resistor Set. The reference voltage of the current digital-to-analog converter (DAC) is applied
3
RSET
across the internal R
resistor to generate the reference current of the DAC.
SET
4
5
6
OUT
Output
ENABLE
Enable. Drive high to enable the device. Pull low to disable the device.
V
DD
Positive Power Supply. Bypass to GND with a 0.1FF capacitor.
for standard-definition video. Therefore, the maximum
Detailed Description
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.
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.
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 150Ivideo load to ground. The out-
put 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.
R
Resistor
SET
The video current DAC imposes a reference voltage,
V , across R
REF
. The resulting current (V /R ) is
SET
REF SET
the reference current for the video current DAC.
Input
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 applica-
tions where the amplifier output can be directly shorted.
The video input should be directly connected to the out-
put of the video current DAC. R , the equivalent input
resistance, is 872I to ground. The output current of the
video DAC flows through R to create the video signal
IN
IN
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 chan-
nel 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
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
Application Information
The MAX9680 output must be DC-coupled. No
AC-coupled capacitors are allowed. The MAX9680 con-
nects 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 volt-
age is between 2.7V and 3.6V, the input voltage range
extends from ground to 0.445V. When the supply volt-
age 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 con-
nected 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
V
DD
to GND with a 0.1FF capacitor. Place all external
components as close as possible to the device.
Typical Application Circuit
V
= 2.8V
DD
VIDEO ENCODER
IN
DAC
LPF
BUFFER
OUT
R
IN
75I
RSET
MAX9680
R
SET
G = 5.2V/V
ENABLE
SHUTDOWN
CONTROL
GENERAL-PURPOSE OUTPUT
GND
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
DOCUMENT NO.
21-0077
6 SC70
X6SN+1
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
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
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