www.intersil.com
Techwell
Techwell
Target ApplicationsTarget Applications
New Features
The TW2837 is an improved version of TW2835 with four high quality
NTSC/PAL video decoders, dual color display controllers and dual video
encoders. The device includes four built-in analog anti-aliasing filters, four
10-bit ADCs, a proprietary digital gain/clamp controller, a high quality Y/C
separator to reduce cross noise, and a high performance free scaler. The
TW2837 has four built-in motion, blind and night detectors and a flexible
video display/record/playback controller supporting basic display and
MUX functions. The device also has an enhanced 256-color OSD that can
display bitmap, single box, 2D array box, and mouse pointer. The built-in
channel ID CODEC allows auto decoding and displaying during playback,
and the additional scaler on the playback supports multi-cropping
function of the same field or frame image. The TW2837 has two NTSC/PAL
video encoders with three 10-bit DACs that can support composite and
S-video outputs. The TW2837 also has an improved audio CODEC which
has four audio ADCs and one DAC. A built-in audio controller can generate
digital outputs for recording/mixing and accept digital input for playback.
The TW2837 can be configured up to 8/16 channel video controller using
chip-to-chip cascade connection. TW2837 is pin-to-pin compatible to
TW2835.
TW2837
Analog QUAD/MUX System
4/8/16 Channel DVR System
Car Rear Vision System
Hair Shop System
Dental Care System
4-Channel Video and Audio Controller
For Security Applications
Improved video decoder with adaptive 4H
comb filters for all NTSC and PAL standards
An enhanced OSD with 256 color look up table
and supports OSD Block Move, Block Fill and
Bitmap Burst Write functions to enhance the
OSD buffer write performance
PCM 8/16-bit and u-Law/A-Law 8-bit for audio
word length
Additional audio PLL for accurate 8KHz/16KHz
sampling rate
Programmable audio sample rates: 8, 16, 32,
44.1 and 48kHz
Video field locked audio sample support
Audio master/slave I2S interface for playback
and record
Dual Video Controllers
Support full triplex function with 4ch live, 4ch playback display and
4ch record output
Analog/Digital channel ID CODEC for record and playback application
Support adaptive median filter for Record
Supports pseudo 8 channel and/or dual page mode
Horizontal/Vertical mirroring for each channel
Last image captured when video-loss detected
Auto sequence switch with 128 queues and/or manual switch by
interrupt for record path
Channel skip in auto sequence switch for record path when video-loss
detected
Image enhancement for zoomed or still image in display path
High performance 2X zoom to horizontal and vertical direction for
display path
Extendable up to 8/16 channel video controller using cascade
connection
Quad MUX switch with 32 queues and/or manual control by interrupt
for record path
256 color bitmap OSD overlay with 720x480 in NTSC / 720x588
resolution in PAL
Four programmable single boxes and four 2D arrayed boxes overlay
Mouse pointer overlay
Dual Video Encoders
Dual path digital outputs with ITU-R BT.656
standard
Dual path analog outputs with all analog
NTSC/PAL standards
Programmable bandwidth of luminance and
chrominance signal for each path
Three 10-bit video CMOS DACs
Audio CODEC
Integrated four audio ADCs and one audio DAC
Provides multi-channel audio mixed analog output
Supports a standard I2S interface for record output and playback input
PCM 8/16 bit and u-Law/A-Law 8bit for audio word length
Programmable audio sample rate that covers popular frequencies of
8/16/32/44.1/48kHz
Video Decoder
Accepts all NTSC(M/N/4.43)/PAL
(B/D/G/H/I/K/L/M/N/60) standards with
auto detection
Integrated four video analog anti-aliasing filters
and 10 bit CMOS ADCs
IF compensation filter for improvement of color
demodulation
Color Transient Improvement (CTI)
Automatic white peak control
Programmable hue, saturation, contrast,
brightness and sharpness
High performance horizontal and vertical scaler
for each path including playback input
Supports ITU-R BT.656 format or time multiplexed
output with 54MHz or 108MHz
Auto cropping / strobe for playback input with
Channel ID decoder
Supports four channel full D1 record mode
Techwell
TW2837
*Pin to Pin compatible with TW2835
Techwell
© 2009 Intersil Americas Inc. All Rights Reserved. The following are trademarks or registered trademarks of Intersil Americas Inc.:
Intersil, Intersil logo, “i” and Design. All other trademarks are the property of the respective trademark owners.
www.intersil.com
*Pin to Pin compatible with TW2835
TW2837
4-Channel Video and Audio Controller
For Security Applications
TW2837 Block Diagram
MPP Interface HOST Interface IRQ Interface
Clock
Generator
CLKMPP1
CLKMPP2
CLKVDOX
CLKVDOY
Decimation Filter
Decimation Filter
Decimation Filter
Decimation Filter
Interpolation Filter
I2S Interface
ADC ADC ADC ADC DAC
AIN0
AIN1
AIN2
AIN3
AOUT
Video
Decoder
Video
Decoder
Video
Decoder
Video
Decoder
Dual Scaler
Dual Scaler
Dual Scaler
Dual Scaler
Motion Detect
Motion Detect
Motion Detect
Motion Detect
ADC ADC ADC ADC
MUXMUXMUXMUX
VIN0A
VIN0B
VIN1A
VIN1B
VIN2A
VIN2B
VIN3A
VIN3B
ITU-R
BT656
Decoder
Channel ID
Decoder
Playback
Path Control
Auto-Crop &
Multi-Scaler
PBCLK
PBIN
8 x 8
Matrix
4 x 4
Matrix
DLINKI/MPP1/2 HSPB/HCSB0,1/HALE
HRDB/HWRB/HDAT
IRQ CLK54I
Write/
Read
Control
Display
Path
Process
Record
Path
Process
Encoder
Timing
Interface
Video
Encoder II
ITU-R
BT656
Encoder
Video
Encoder II
DAC
DAC
VAOYX
VAOCX
VDOX
VDOY
DAC
VAOYY
HSENC
VSENC
FLDENC
HLINKI
VLINKI
DLINKI
ADDR/BA/RASB/CASB/WENB/DQM/DATA
