ViewSonic N1900w-1E, Руководство по обслуживанию

Страница: 26 / 80

GND
 Ground Platform
This pin is main ground for all above supplies.
VSUP3.3DAC
 Supply Voltage 3.3 V
This pin is main supply for the video DACs.
GNDDAC
 Ground for 3.3 V Video DAC Supply
VSUP3.3EIO
 Supply Voltage 3.3 V
This pin is main and standby supply for the extended
digital I/O-ports available in QFP package only. It is
internally connected to
VSUP3.3IO.
I501 UV1316
The UV1316 MK4 tuner belongs to the UV1300 family of fourth generation WSP tuners, which are
designed to meet a wide range of TV applications. It is a full band tuner suitable for CCIR systems B/G,
H,L, L’, I and I’. The low IF output impedance is designed for direct drive of a wide variety of SAW
filters with sufficient suppression of triple transient.
The UV1316 MK4 is backwards compatible with its predecessors, the UV1316 MK1, MK2 and MK3.
In addition, a 5 level Analog Digital Converter comes standard with the MK4.
This tuner complies with the requirements of radiation, signal handling capability and immunity
conformingto:
· CISPR 13 (1990) incl. amendment 1 (1992) and amendment 2 (1993)
· European standards CENELEC EN55013, EN55020
· CISPR13 (4th Edition)
SYMBOL PIN DESCRIPTION
AGC Pin 1 Automatic Gain Control Voltage
TU Pin 2 Tuning voltage monitor (output)
AS Pin 3 I 2C-Bus Address Select
SCL Pin 4 I 2C-Bus Serial Clock
SDA Pin 5 I 2C-Bus Serial Data
N.C. Pin 6 Not Connected
Vs Pin 7 Supply V5V
ADC Pin 8 ADC Input (5)
VST Pin 9 Fixed tuning Supply V33V
I.F out 2 / d.n.c Pin 10 Symmetrical I.F output 2 / Do not connect for asymmetrical
I.F out 1 Pin 11 Asymmetrical I.F Output / Symmetrical I.F output 1
GND M1,M2,M3,M4 Mounting Tags (Ground)
AUDIO
I603 TPA2008D2
The TPA2008D2 is third generation 5-V class-D amplifier from Texas Instruments. Improvements to
previous generation devices include: dc volume control, lower supply current, lower noise floor, higher
efficiency, smaller packaging, and fewer external components. Most notably, a new filter-free class-D
modulation technique allows the TPA2008D2 to directly drive the speakers, without needing a low-pass
output filter consisting of two inductors and three capacitors per channel. Eliminating this output filter
saves approximately 30% in system cost and 75% in PCB area.
The improvements and functionality make this device ideal for LCD projectors, LCD monitors,
powered speaker, and other applications that demand more battery life, reduced board space, and
functionality that surpasses currently available class-D devices.
A chip-level shutdown control limits total supply current to 1 µA, making the device ideal for battery
powered applications. Protection circuitry increases device reliability: thermal and short circuit.
Under voltage shutdown saves battery power for more essential devices when battery voltage drops to
low levels.
The TPA2008D2 is available in a 24-pin TSSOP
Symbol Pin Description
AGND Pin 12 - Analog ground
BYPASS Pin 22 - I - Tap to voltage divider for internal mid-supply bias generator used for internal
analog reference.
COSC Pin 10 - I - A capacitor connected to this terminal sets the oscillation frequency in conjunction
with ROSC. For proper operation, connect a 220-pF capacitor from COSC to ground.
LINN Pin 1 - I - Negative differential audio input for left channel
LINP Pin 2 - I- Positive differential audio input for left channel
ViewSonic Corporation
Confidential - Do Not Copy
N1900w-1E
23