TMC2242AR2C1 Fairchild Semiconductor, TMC2242AR2C1 Datasheet

Video ICs Interp/Decim Filter Digital HB 12B/16B

TMC2242AR2C1

Manufacturer Part Number
TMC2242AR2C1
Description
Video ICs Interp/Decim Filter Digital HB 12B/16B
Manufacturer
Fairchild Semiconductor
Type
Digital Half Band Filtersr
Datasheet

Specifications of TMC2242AR2C1

Operating Supply Voltage
- 0.5 V to + 7 V
Supply Current
195 mA
Maximum Operating Temperature
70 C
Package / Case
PLCC-44
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
• TMC2242A and TMC2242B are pin-compatible with
• User selectable interpolate gain, -6 dB or 0 dB (2242B)
• 30, 40 and 60 MHz speed grades
• User selectable 2:1 decimation, 1:2 interpolation, and
• Passband ripple < ± 0.01 dB
• Stopband rejection 59.4 dB from 0.28 to 0.50 x f
• Cascading two TMC2242A or TMC2242B meets
• Dedicated 12-bit 2's complement input data port and
• Two's complement or offset binary output format
• Built-in limiter prevents overflow
Description
The TMC2242A and TMC2242B are fixed-coefficient lin-
ear-phase half-band (low-pass) digital filters. They can be
used to halve or double the sampling rate of a digital signal.
When used as a decimating post-filter with a double-speed
oversampling A/D converter, they greatly reduce the cost and
complexity of anti-aliasing filters required ahead of the A/D
converter. When used as an interpolating pre-filter with a
double-speed oversampling D/A converter, the TMC2242A
and TMC2242B significantly reduce the design complexity
and production cost of reconstruction filters used on D/A
outputs.
Block Diagram
TMC2242A/TMC2242B
Digital Half-Band Interpolating/Decimating Filter
12-bit In/16-bit Out, 60 MHz
TMC2242
equal-rate filter modes
CCIR 601 low-pass filter requirement
16-bit output data port with user-selectable rounding from
9 to 16 bits
SYNC
SI
DEC
CLK
11-0
INT
12
Control
12
Decimate, Equal Rate 1-1-1-1
12
Interpolate 0-1-0-1
s
12
55 Tap
Filter
FIR
• Single +5 Volt power supply operation
• Small 44-Lead PLCC and 44-Lead MQFP
Applications
• Low-cost video filtering
• Chrominance bandwidth limiter
• Simple, inexpensive video D/A post-filters
• Reduced cost and complexity for A/D anti-aliasing filters
• High-performance digital low-pass filters
• Digital waveform reconstruction post-filtering
• Telecommunications
• Direct digital synthesis
• Radar
The TMC2242A and TMC2242B user selects the mode of
operation (decimate, interpolate, or equal-rate) and round-
ing. The TMC2242A and TMC2242B accept 12-bit 2's com-
plement data at up to 60 MHz and output saturated
(overflow-protected) 2's complement or offset binary data
rounded to from 9 to 16 bits. Within the speed grade I/O
limit, the output sample rate may be 1/2, 1, or 2 times the
input sample rate.
Round
Limit
3
and
16
16
www.fairchildsemi.com
16
65-2242A-01
RND
TCO
OE
SO
2-0
15-0
Rev. 1.2.0

Related parts for TMC2242AR2C1

TMC2242AR2C1 Summary of contents

Page 1

TMC2242A/TMC2242B Digital Half-Band Interpolating/Decimating Filter 12-bit In/16-bit Out, 60 MHz Features • TMC2242A and TMC2242B are pin-compatible with TMC2242 • User selectable interpolate gain (2242B) • 30, 40 and 60 MHz speed grades • User ...

Page 2

PRODUCT SPECIFICATION Description (continued) The filter response is flat to within ± 0.01 dB from 0. with stopband attenuation greater than 59 from 0. the Nyquist frequency. The response is ...

Page 3

TMC2242A/TMC2242B Pin Descriptions Pin Number Pin Name PLCC MQFP Timing Controls INT 44 38 Interpolate. When INT is LOW and DEC is HIGH, the input data register runs at 1/2 the CLK rate and zeros are inserted in the data ...

Page 4

PRODUCT SPECIFICATION Absolute Maximum Ratings (beyond which the device may be damaged) Parameter Supply Voltage Input Voltage 2 Output Applied Voltage 3,4 Externally Forced Current Short Circuit Duration Operating Temperature (Case) Junction Temperature Lead Soldering Temperature Storage Temperature Notes: 1. ...

Page 5

TMC2242A/TMC2242B Electrical Characteristics Parameter I Total Power Supply DD Current I Power Supply Current, DDU Unloaded I Power Supply Current, DDQ Quiescent C I/O Pin Capacitance PIN I Input Current, HIGH IH I Input Current, LOW IL I Leakage Current, ...

Page 6

PRODUCT SPECIFICATION Table 2. Impulse Response Hex Decimal Equivalent FFF2 -0.000875473 0000 0.0 0017 0.001390457 0000 0.0 FFDB -0.002265930 0000 0.0 0039 0.003501892 0000 0.0 FFA8 -0.006366836 0000 0.0 007D 0.007621765 0000 0.0 FF51 -0.01071167 0000 0.0 00F3 0.01483154 0000 ...

Page 7

TMC2242A/TMC2242B Table 4b. Output Data Formats and Bit Weighting for TCO = 1 Interpolation Mode (TMC2242A and TMC2242B when INT = 0 and DEC = … 2 Decimation, Equal Rate Modes (and ...

Page 8

PRODUCT SPECIFICATION Table 6. TMC2242B Steady-State Output Values and Limiter Triggers (L) versus Input Data Interpolation Modes INT = 0 and DEC = 0 Input TCO = 0 7FF 0000 (L) 400 3FEF / 3FDF 001 7FEF 000 7FFF FFF ...

Page 9

TMC2242A/TMC2242B Performance Curves (continued) 0.10 0.08 0.06 0.04 0.02 0.00 -0.02 -0.04 -0.06 -0.08 -0.10 0.00 110 100 - Equivalent Circuits V Digital Input GND Figure 7. Equivalent ...

Page 10

PRODUCT SPECIFICATION Timing Diagrams CLK SI 34 11-0 SYNC SO 15 LOW. Note: Values at SO are impulse response centers (peaks) corresponding to same-numbered inputs. 15-0 34 CLK SI 34 11-0 SYNC 15 ...

Page 11

TMC2242A/TMC2242B Timing Diagrams (continued) OE Three-State Outputs Figure 9. Threshold Levels for Three State Measurements Applications Discussion The TMC2242A and TMC2242B are well-suited for filtering digitized composite NTSC or PAL video. In Figure 10, the TMC1175A 8-bit video A/D converter ...

Page 12

PRODUCT SPECIFICATION Notes: 12 TMC2242A/TMC2242B ...

Page 13

TMC2242A/TMC2242B Notes: PRODUCT SPECIFICATION 13 ...

Page 14

PRODUCT SPECIFICATION Mechanical Dimensions – 44-Pin PLCC Package Inches Millimeters Symbol Min. Max. Min. A .165 .180 4.19 A1 .090 .120 2.29 A2 .020 — .51 B .013 .021 .33 B1 .026 .032 .66 D/E .685 .695 17.40 D1/E1 .650 ...

Page 15

TMC2242A/TMC2242B Mechanical Dimensions – 44-Lead MQFP Package Inches Millimeters Symbol Min. Max. Min. A .077 .093 1.95 A1 .000 .010 .00 A2 .077 .083 1.95 B .012 .018 .30 C .005 .009 .13 D/E .510 .530 12.95 D1/E1 .390 .398 ...

Page 16

... TMC2242A/TMC2242B Ordering Information Product Number Temperature Range TMC2242AR2C 0°C to 70°C TMC2242AR2C1 0°C to 70°C TMC2242AR2C2 0°C to 70°C TMC2242BR2C 0°C to 70°C TMC2242BR2C1 0°C to 70°C TMC2242BR2C2 0°C to 70°C TMC2242AKTC 0°C to 70°C TMC2242AKTC1 0°C to 70°C TMC2242AKTC2 0°C to 70°C TMC2242BKTC 0° ...

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