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ML6424-1

Datasheet ML6424-1, ML6424-2, ML6425-1, ML6425-2 Datasheet (Micro Linear Corporation)

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Page 1
February 1997 PRELIMINARY
ML6424*/ML6425*
CCIR601 Video Lowpass Filter
with Optional Sinx/x Correction
GENERAL DESCRIPTION
The input signal can be either AC or DC coupled under the control of the MODE pin. In the DC coupled case, a control pin (RANGE) is provided to allow the inputs to swing down to ground. Internal self clamping is provided for AC coupled signals.
The ML6424 and ML6425 are powered by a single 5V supply, and can drive 1VPP into 75Ω (0.5V to 1.5V), or 2VPP into 150Ω (0.5 to 2.5V). The maximum output swing from 0.5V to 2.5V allows easy interface to the ML6400
FEATURES
■ External or internal input clamping with pulse output
for synchronous clamping of multiple filters
■ Frequenc y tunable with R
■ ±0.25dB ripple
■ >40dB attenuation at f > 1.45 x f
■ >35dB attenuation at f > 1.45 x f
■ –12dB attenuation at f = 1.23 x f
■ Group delay distortion: ±20ns up to 0.9 x f
■ <1% peak overshoot and ringing on 2T test pulse
■ 0.5% diff. gain and 0.5⋅ diff. phase typical
■ THD <1% at 3.58 or 4.43MHz
■ Programmable input-output gain of 1x or 2x
■ 5V ±5% operation
EXT
: ±10%
(w/o sinx/x)
C
(with sinx/x)
C
C
C
family of A/D converters. *Some packages Are Obsolete
BLOCK DIAGRAM
+5V
GAIN
13
V
CC
5 11 3 1
V
CC
V
CC
V
CC
6
12
4
INPUT
CLAMP
PULSE
CONTROL
+ –
8
RANGE
5TH ORDER
LOW PASS
9 10 14 2
R 10kΩ 1%
EXT
3RD ORDER
ALL PASS
FILTER BIAS
GND GND GND
SINX/X
15
+
BUFBUF
–
V
OUT
V
OUT
167
V
IN
V
M
IN
MODE
PULSE
I/O
P
ML6424-1 ML6424-2 ML6425-1 ML6425-2
Bandwidth 5.50MHz 2.75MHz 5.50MHz 2.75MHz Sinx/x No No Yes Yes
P M
1
Page 2
ML6424/ML6425
PIN CONFIGURATION
Package: S16W
16-Pin SOIC
V
GND
V
PULSE I/O
V
VIN P
V
IN
RANGE
CC
CC
CC
M
1
2
3
4
5
6
7
8
TOP VIEW
16
V
M
OUT
15
V
P
OUT
14
GND
13
GAIN
12
MODE
11
V
CC
10
GND
9
R
EXT
2
Page 3
PIN DESCRIPTION
ML6424/ML6425
Pin # Name Description
1,3, V
CC
Positive supply voltages
5,11 (4.75V to 5.25V). 2,10, GND Ground voltages.
14 4 PULSE I/O U/V clamp switch control input/output
pin. When MODE is low, U/V clamp control pulse can be applied to this input pin. When MODE is high, the internal circuit generates a U/V clamp control signal to produce an output pulse at this pin. When MODE is floating, do not apply any voltage to this pin since it is internally tied low in this case. (See table below)
6,7 VIN P, Input to the filter. The input voltage for
VIN M the filter is applied to VIN P pin with
respect to VIN M pin which is grounded. (With no connection to MODE pin, input signal range should be from VIN = 0.5V to 1.5V when RANGE = Low, VIN = 0V to 1V when RANGE = High). There is a 100µA internal current source connected to each of these inputs.
8 RANGE Input signal range control when
MODE is floating. When RANGE is low, the input signal range is 0.5V to
1.5V, when RANGE is tied high the input signal range is 0V to 1V.
9R
EXT
Precision resistor to ground that defines the cutoff frequency of the filter . (Typical value = 10kΩ) 10% change in R
produces a 10%
EXT
change in fC (Fig. 28).
Pin # Name Description
12 MODE Input coupling mode control pin.
When MODE is low, U/V signal can be applied through an external ac coupling capacitor to V
P. When
IN
MODE is high, Y signal can be applied through an external AC coupling capacitor to VIN P. In this case, an internal circuitry clamps the sinc tip of the video input signal. When MODE is set to mid supply or left floating, input signal can be directly applied to the input without an A C coupling capacitor.
13 GAIN Three state gain control pin. GAIN tied
low sets the input amplifier gain to 3/4 (0.75) and the output amplifier gain to 4/3 (1.333). When GAIN is tied high, the input amplifier gain is 3/2 (1.5) and the output amplifier gain is 4/3. When GAIN is set to mid supply or left to float, the input amplifier gain is 3/4 and the output gain is 8/3 (2.666). (See table below)
15,16 V
P, The output from the filter is derived
OUT
V
M from the V
OUT
the V
OUT
P pin with respect to
OUT
M pin which is grounded typically. It can drive 1VPP/75Ω (0.5V to 1.5V) or 2VPP/150Ω (0.5V to 2.5V). If the ouput common-mode level needs to be increased, it can be done by raising the potential of V
OUT
M. In this case, the output is measured from V
P with respect to GND.
OUT
MODE INPUT COUPLING PULSE
Low AC for U/V Input Float DC Internally biased High AC for Y Output
Pulse Mode Table
GAIN INPUT INPUT OUTPUT OUTPUT OPTIMIZES
SELECT BUFFER BUFFER
GAIN GAIN
Low 1V
Float 1V
High 1V
0.75 1.333 1V
PP
0.75 2.666 2V
PP
1.50 1.333 2V
PP
PP PP
PP
—
Differential
Phase
& Gain
Noise
Gain Table
3
Page 4
ML6424/ML6425
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute
OPERATING CONDITIONS
Operating temperature range.........................0°C to 70⋅C
Operating supply range .......................................5V ±5%
maximum ratings are stress ratings only and functional device operation is not implied.
DC Supply Voltage ........................................–0.3V to 7V
Analog & Digital
Inputs/Outputs................................. –0.3V to VCC + 0.3V
Input current per pin .............................. –25mA to 25mA
Storage Temperature ................................ –65°C to 150⋅C
Maximum Junction Temperature ............................ 15 0⋅C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, VCC = 4.75 to 5.25V, TA = Operating Temperature Range (Note 1).
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Current 100 150 mA Input Current (VIN P, VIN M) Sourcing out of the device 80 100 120 µA Input Current Matching Between VIN P and VIN M (tied to GND) 3.0 5 % Low Frequency Gain VIN = 100mV Passband Ripple 100Hz < fIN < f Differential Gain (RANGE = High) VIN: 1.0V ± 0.5V, @ 3.58 or 4.43MHz 0.5 1 %
@ 100kHz –0.2 0.0 0.2 dB
P–P
C
–0.25 0.25 dB
Differential Phase (RANGE = High) VIN: 1.0V ± 0.5V, @ 3.58 or 4.43MHz 0.5 1 Degree Dynamic Input Signal Range (MODE = Float) RANGE = Low 0.5 1.5 V
RANGE = High 0 1 V
Output Noise (GAIN = High) Bw: 30MHz, ML6424-1 1.7 2.3 mV
Bw: 30MHz, ML6424-2 1.3 1.9 mV Bw: 30MHz, ML6425-1 1.7 2.3 mV Bw: 30MHz, ML6425-2 1.3 1.9 mV
Corner Frequency (fC) (±0.25dB) ML6424-1 or ML6425-1 5.23 5.50 5.78 MHz
ML6424-2 or ML6424-2 2.61 2.75 2.89 MHz Stopband Loss (ML6424-1, -2) f Stopband Loss (ML6425-1, -2) f Peak Overshoot and Ringing 2T, 0.7V Composite Chroma/Luma Delay TD(subcarrier) – TD(0); fC = 5.5MHz 20 ns Output Short Circuit Current V Load Capacitance V Logic Input Low (VIL) RANGE 0.8 V Logic Input High (VIH) RANGE VCC – 0.8 V
> 1.45 x corner frequency 35 38 dB
IN
> 1.45 x corner frequency 30 33 dB
IN
pulse 1 %
P–P
P to GND while V
OUT
P to GND 35 pF
OUT
M = GND 45 mA
OUT
RMS RMS RMS RMS
Logic Input Low (IIL)V Logic Input High (IIL)V
Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst case conditions. Note 2: Digital Inputs: All inputs are high impedance 1µA leakage, with MAX input voltage levels of 0.8V from each supply
= GND –1 µA
IN
= V
IN
CC
4
1µA
Page 5
FUNCTIONAL DESCRIPTION
The ML6424 and ML6425 are monolithic CCIR601 continuous time video filters, designed for broadcast and professional luminance and chrominance antialias and reconstruction applications. They are fabricated using Micro Linear’s 1.5µ, 4 GHz BiCMOS process. The filter incorporates an input amplifier, programmable gain of 1x or 2x set by the GAIN pin, a fifth order lowpass filter, a third order allpass filter, and an output amplifier capable of driving 75Ω to ground. The ML6425 provides sinx/x equalization.
ML6424/ML6425
can be applied to the input and the PULSE I/O pin generates a clamping pulse for the U/V channel. When MODE = Low, U/V channel signal can be applied to the input. In this case, the PULSE I/O pin can take the pulse signal generated from the PULSE I/O pin of the other chip in the Y-channel. In the case of direct coupling, RANGE should be adjusted according to the input signal range. When RANGE is low, the input signal range is 0.5V to
1.5V. When the input signal goes down to 0V, RANGE should be tied high. In this case, an offset is added to the input so that the filter can process the 0V DC level.
The ML6424–1 is intended for application as luminance antialias processing, the ML6424–2 for chrominance antialias, the ML6425–1 for luma reconstruction, and the ML6425–2 for chroma reconstruction.
Input signals can be applied either through an A C coupling capacitor (MODE = High/Low) or directly to the input pin (MODE = float). With MODE = High, Y-Channel signal
6
VIN P
7
VIN M
12
MODE+5V
4
PULSE I/O
6
VIN P
7
VIN M
ML6424-1
ML6424-2
1µF
Y 75Ω
1µF
U
75Ω
The output amplifier is designed to drive up to 20mA peak into a 75Ω load, or 17mA peak into a 150Ω load. Load resistance less than 75Ω and/or output voltage above 1.5V into 75Ω (2.5V into 150Ω) may cause signal distortion.
Good high frequency decoupling is required between each power supply pin and ground, otherwise oscillations and/or excessive crosstalk may occur.
1µF
Y 75Ω
1µF
U
75Ω
ML6424-1
6
VIN P
7
VIN M
12
MODE+5V
4
PULSE I/O
ML6424-2
6
VIN P
7
VIN M
12
MODE
4
PULSE I/O
6
VIN P
7
VIN M
12
MODE
4
PULSE I/O
ML6424-2
1µF
V
75Ω
Figure 1. YUV Filter with Sync on Y Input
and Auto Clamp On
12
MODE
4
PULSE I/O
1µF
V
75Ω
ML6424-2
6
VIN P
7
VIN M
12
MODE
4
PULSE I/O
Figure 2. YUV Filter with External Sync for U/V
5
Page 6
ML6424/ML6425
Y 75Ω
C
75Ω
1µF
1µF
ML6424-1
6
VIN P
7
VIN M
12
MODE+5V
4
PULSE I/O
ML6424-2
6
VIN P
7
VIN M
12
MODE
4
PULSE I/O
Figure 3. Y/C Filter
6
Page 7
ML6424-1 RESPONSE CURVES
ML6424/ML6425
+10
0
–10
–20
–30
–40
–50
AMPLITUDE (dB)
–60
–70
–80
–90
0.1 1 10 50
FREQUENCY (MHz)
+0.3
+0.2
+0.1
0.0
–0.1
–0.2
–0.3
AMPLITUDE (dB)
–0.4
–0.5
–0.6
–0.7
100k 3M 6M
FREQUENCY (Hz)
Figure 4. Amplitude vs Frequency Figure 5. Amplitude vs Frequency
0˚
0˚—
PHASE (45˚/div)
500k 5.5M
FREQUENCY (Hz)
Figure 6. Phase vs Linear Frequency
380
360
340
320
GROUP DELAY (ns)
300
PHASE (10˚/div)
500k 5.5M
FREQUENCY (Hz)
Figure 7. Deviation from Linear Phase
280
100k 3M 6M
FREQUENCY (Hz)
Figure 8. Group Delay vs Frequency
7
Page 8
ML6424/ML6425
ML6424-2 RESPONSE CURVES
+10
0
–10
–20
–30
–40
–50
AMPLITUDE (dB)
–60
–70
–80
–90
0.1 1 10 30
FREQUENCY (MHz)
Figure 9. Amplitude vs Frequency
0˚
+0.4
+0.3
+0.2
+0.1
0.0
–0.1
–0.2
AMPLITUDE (dB)
–0.3
–0.4
–0.5
–0.6
100k 1.5M 3M
FREQUENCY (Hz)
Figure 10. Amplitude vs Frequency
0˚
PHASE (45˚/div)
200k 2.2M
FREQUENCY (Hz)
Figure 11. Phase vs Linear Frequency
730
690
650
610
GROUP DELAY (ns)
570
PHASE (5˚/div)
200k 2.2M
FREQUENCY (Hz)
Figure 12. Deviation from Linear Phase
530
100k 1.5M 3M
FREQUENCY (Hz)
Figure 13. Group Delay vs Frequency
8
Page 9
ML6425-1 RESPONSE CURVES
ML6424/ML6425
20
10
0
–10
–20
–30
–40
–50
RELATIVE AMPLITUDE (dB)
–60
–70
–80
100k 1M 10M
FREQUENCY (Hz)
Figure 14. Amplitude vs Frequency
0˚
+4dB
3.0
2.0
1.0
RELATIVE AMPLITUDE (dB)
0
0.1
1
FREQUENCY (MHz)
23
Figure 15. Amplitude vs Frequency
0˚
PHASE (45˚/div)
500k 5.5M
FREQUENCY (Hz)
Figure 16. Phase vs Frequency
410
390
370
350
330
310
290
GROUP DELAY (ns)
270
250
230
210
100k 3.5M 6M
FREQUENCY (Hz)
Figure 18. Group Delay vs Frequency
PHASE (10˚/div)
500k 5.5M
FREQUENCY (Hz)
Figure 17. Deviation from Linear Phase
9
Page 10
ML6424/ML6425
ML6425-2 RESPONSE CURVES
20
10
0
–10
–20
–30
–40
–50
RELATIVE AMPLITUDE (dB)
–60
–70
–80
100k 1M 10M
FREQUENCY (Hz)
Figure 19. Amplitude vs Frequency
0˚
4
3
2
1
AMPLITUDE (dB)
0
100k 6.0M
FREQUENCY (Hz)
Figure 20. Amplitude vs Frequency
PHASE (45˚/div)
200k 2.2M
FREQUENCY (Hz)
Figure 21. Phase vs Linear Frequency
630
GROUP DELAY (20ns/div)
100k 3.0M
FREQUENCY (Hz)
Figure 23. Group Delay vs Frequency
PHASE (5˚/div)
200k 2.2M
FREQUENCY (Hz)
Figure 22. Deviation from Linear vs Phase
6
5
4
3
CUT OFF FREQUENCY (Hz)
2
8 9 10 12
Figure 24. Frequency vs R
ML6424/25-1
ML6424/25-2
11
REXT (k)
EXT
10
Page 11
ML6425-2 RESPONSE CURVES
INPUT FROM
DAC OUTPUT
AMPLITUDE (0.5V/div.)
TIME (500ns/div.)
Figure 25. Transient Response
ML6424/ML6425
FILTER
OUTPUT
11
Page 12
ML6424/ML6425
PHYSICAL DIMENSIONS inches (millimeters)
Package: S16W
16-Pin Wide SOIC
0.400 - 0.414
16
(10.16 - 10.52)
0.024 - 0.034 (0.61 - 0.86)
(4 PLACES)
0.090 - 0.094 (2.28 - 2.39)
1
PIN 1 ID
0.050 BSC (1.27 BSC)
0.012 - 0.020 (0.30 - 0.51)
0.291 - 0.301 (7.39 - 7.65)
0.095 - 0.107 (2.41 - 2.72)
SEATING PLANE
0.398 - 0.412
(10.11 - 10.47)
0.005 - 0.013 (0.13 - 0.33)
0º - 8º
0.022 - 0.042 (0.56 - 1.07)
0.009 - 0.013 (0.22 - 0.33)
ORDERING INFORMATION
PART NUMBER FREQ SIN X/X TEMPERATURE RANGE PACKAGE
ML6424-15.5NO0⋅C to 70⋅C16-Pin SOIC (S16W) (Obsolete)
ML6424-2 2.75 NO 0⋅C to 70⋅C 16-Pin SOIC (S16W)
ML6425-15.5YES0⋅C to 70⋅C16-Pin SOIC (S16W) (Obsolete)
ML6425-2 2.75 YES 0⋅C to 70⋅C 16-Pin SOIC (S16W)
© Micro Linear 1997 is a registered trademark of Micro Linear Corporation Products described herein may be covered by one or more of the following patents: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017; 5,559,470; 5,565,761, 5,594,376, 5,592,128. Other patents are pending.
Micro Linear reserves the right to make changes to any product herein to improve reliability, function or design. Micro Linear does not assume any liability arising out of the application or use of any product described herein, neither does it convey any license under its patent right nor the rights of others. The circuits contained in this data sheet are offered as possible applications only. Micro Linear makes no warranties or representations as to whether the illustrated circuits infringe any intellectual property rights of others, and will accept no responsibility or liability for use of any application herein. The customer is urged to consult with appropriate legal counsel before deciding on a particular application.
12
2092 Concourse Drive
San Jose, CA 95131
Tel: 408/433-5200
Fax: 408/432-0295
DS6424_25-01
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