ADC-121R [FARADAY]
VIDEO FRONT-END MODULES;
| 型号： | ADC-121R |
| 厂家： | 
FARADAY TECHNOLOGY |
| 描述： | VIDEO FRONT-END MODULES |
| 文件： | 总5页 (文件大小：187K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ADC-100 RANGE
VIDEO FRONT-END MODULES
The ADC-100 range converts analogue video in various formats to 10 or 12 bit parallel digital
video. The range provides a complete front end solution for the digitising of high quality
component, composite or s-video. The module incorporates a tightly specified anti-aliasing filter, an
A-D converter and a digital filter all on a board measuring no more than 1044mm2 (1.65sq in).
Features
Typical applications
· ± 5V operation
· Video Broadcast and studio equipment
· Digital Cameras
· Telecommunications equipment
· Video Frame Grabber Cards for PCs
· Closed Circuit Security
· High impedance input stage
· Filtered and buffered video o/p
· User just provides pixel clock and clamp pulse
· Choice of 10 or 12 bit A-D
· Matched digital delay Y,Pb/Pr units
(to eliminate additional delay lines)
ADC-100 BLOCK DIAGRAM
© Faraday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change without notice
Fara064d.doc Page 1 of 5 Apr-01(E)
Technical Description
The ADC-100 range of modules are a complete front end solution for digitising analogue video.
They comprise all buffering and filtering components required - allowing the user to connect
directly to the video source. A dc clamp is provided to ensure that the black level is accurately set
before being presented to the A-D converter. The modules utilise 2x oversampling to minimise the
size of the filter components and achieve high performance. The subsequent data is decimated by
high performance low pass digital filters to provide output data with standard sampling rates.
All this is achieved transparently to the user; the only control signals required are a back porch
clamp signal, a sync pulse to align the digital filter and an appropriate clock.
For further details of the digital filter functionality consult Fairchild datasheet TMC2242.
Typical I/P circuit for minimal tilt
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Apr-01(E)
Specification
ADC-100, ADC-101,
ADC-120, ADC-122
6.0 MHz with ripple of ± 0.05 dB.
21.0 MHz
ADC-121
High Spec. analogue filter
Analogue Filter Passband
2.75 MHz with ripple of ± 0.05 dB.
10.5 MHz
45 dB
< 6 ns to 1.64 MHz
< 20 ns to 2.75 MHz
1% typical
Analogue Filter Start of Stopband
Analogue Filter Stopband rejection
Analogue Filter Group delay ripple
45 dB
< 3 ns to 3.58 MHz
< 10 ns to 6.0 MHz
1% typical
1° typical
+ 300 mA +5v
Differential gain
Differential phase
Supply current
1° typical
+ 300 mA +5v
20 mA
-5v
20 mA
-5v
ADC-110R, ADC-111R,
6.0 MHz with ripple of ± 0.1 dB.
21.0 MHz
Relaxed analogue filter
Analogue Filter Passband
Analogue Filter Start of Stopband
Analogue Filter Stopband rejection
Analogue Filter Group delay ripple
35 dB
< 3 ns to 3.58 MHz
< 16 ns to 6.0 MHz
1.5% typical
1.5° typical
+ 300 mA +5v
Differential gain
Differential phase
Supply current
20 mA
-5v
Digital Filter details
ADC-100, ADC-101, ADC-110,
ADC-111, ADC-120, ADC-121
TMC2242A
ADC-122
Filter Type
TMC2242C
Passband
± 0.01 dB to 0.22 fs
- 6 dB
> 59 dB from 0.28 fs
34 clk periods
± 0.014 dB to 0.22 fs
- 6 dB
> 56 dB from 0.29 fs
68 clk periods
Attenuation at 0.25 fs
Stopband attenuation
Data latency
Note: The ADC-122R uses the TMC2242C digital filter which features a double delay mode enabling the luminance
module (fs = 27 MHz) to output data synchronously with the colour difference modules (fs = 13.5 MHz). This
eliminates the need for a digital delay of the luminance data by 34 clock cycles. For further information consult
Fairchild datasheet TMC2242C.
An absolute delay difference of 37 ns exists between the ADC-122R and ADC-121R due to the differences in
the analogue filters.
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Apr-01(E)
Module Details
Order Code
Gain
Black Comments
Level
Application
MMC
Equivalent
ADC-100R
ADC-100B
1.6
1.6
230
230
10-bit
12-bit
Composite, Luminance (S-video), digital FE-100H10-1
video decoder front end. High performance
applications. fs = 27 MHz
FE-100H12-1
ADC-101R
ADC-101B
1.6
1.6
512
512
10-bit
12-bit
Chrominance , digital video decoder front end. FE-100H10-2
High performance applications. fs = 27 MHz
FE-100H12-2
ADC-110R
ADC-111R
1.6
1.6
230
230
10-bit
relaxed filter
10-bit
relaxed filter
Composite, Luminance (S-video), digital FE-100M-1
video decoder front end. fs = 27 MHz
Chrominance , digital video decoder front end FE-100M-2
fs = 27 MHz
ADC-120R
ADC-121R
2.475 64
10-bit
CCIR-601-2 levels
10-bit
CCIR-601-2 levels
2.75 MHz Filter
Y input (Component Video) , Expanded active not available
video range. fs = 27 MHz
Pb,Pr input (Component video), Expanded not available
active video range. fs =13.5 MHz
2.475 512
ADC-122R
2.475 64
10-bit
CCIR-601-2 levels
Double delay
Y input (Component Video) , Expanded active not available
video range. fs = 27 MHz
Matched digital filter delay.
Note: PROVISIONAL DATA
The modules are fitted with a high performance 10-bit analogue to digital converter as standard (R-
suffix) but they are also available with a 12-bit analogue converter (B suffix)
Devices are normally supplied with a Fairchild half band filter. The units can be optionally supplied
with other compatible half band filters, or with no digital filter at the customers request.
Application Notes
The ADC modules incorporate a clamp circuit which must be fed with a back porch signal derived
on the users pcb. This can easily be generated using standard sync separators.
The user has control over digital filter inputs DEC_N, OE_N and SYNC appropriately. These inputs
allow the user to synchronise the decimation of pixel data and multiplex the outputs from modules.
For further details the user should consult the Fairchild datasheet TMC2242.
The insertion delay difference between the component modules ADC122R and ADC121R can be
eliminated by latching the Luminance data for 1 clock cycle within the application.
Note: This product is Aqueous Washable.
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Apr-01(E)
Faraday Technology Ltd.
Croft Road Industrial Estate,
Newcastle, Staffordshire
Tel:
Fax:
Email:
+ 44 (0)1782 661501
+ 44 (0)1782 630101
sales@faradaytech.co.uk
ST5 0QZ. England.
Web site:
http://www.faradaytech.co.uk
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